JDK8/Java8源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package java.awt;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.Objects;
import java.util.Vector;
import java.util.Locale;
import java.util.EventListener;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.Collections;
import java.awt.peer.ComponentPeer;
import java.awt.peer.ContainerPeer;
import java.awt.peer.LightweightPeer;
import java.awt.image.BufferStrategy;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.awt.image.ColorModel;
import java.awt.image.VolatileImage;
import java.awt.event.*;
import java.io.Serializable;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.beans.Transient;
import java.awt.im.InputContext;
import java.awt.im.InputMethodRequests;
import java.awt.dnd.DropTarget;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.AccessControlContext;
import javax.accessibility.*;
import java.applet.Applet;
import sun.security.action.GetPropertyAction;
import sun.awt.AppContext;
import sun.awt.AWTAccessor;
import sun.awt.ConstrainableGraphics;
import sun.awt.SubRegionShowable;
import sun.awt.SunToolkit;
import sun.awt.WindowClosingListener;
import sun.awt.CausedFocusEvent;
import sun.awt.EmbeddedFrame;
import sun.awt.dnd.SunDropTargetEvent;
import sun.awt.im.CompositionArea;
import sun.font.FontManager;
import sun.font.FontManagerFactory;
import sun.font.SunFontManager;
import sun.java2d.SunGraphics2D;
import sun.java2d.pipe.Region;
import sun.awt.image.VSyncedBSManager;
import sun.java2d.pipe.hw.ExtendedBufferCapabilities;
import static sun.java2d.pipe.hw.ExtendedBufferCapabilities.VSyncType.*;
import sun.awt.RequestFocusController;
import sun.java2d.SunGraphicsEnvironment;
import sun.util.logging.PlatformLogger;
/**
* A <em>component</em> is an object having a graphical representation
* that can be displayed on the screen and that can interact with the
* user. Examples of components are the buttons, checkboxes, and scrollbars
* of a typical graphical user interface. <p>
* The <code>Component</code> class is the abstract superclass of
* the nonmenu-related Abstract Window Toolkit components. Class
* <code>Component</code> can also be extended directly to create a
* lightweight component. A lightweight component is a component that is
* not associated with a native window. On the contrary, a heavyweight
* component is associated with a native window. The {@link #isLightweight()}
* method may be used to distinguish between the two kinds of the components.
* <p>
* Lightweight and heavyweight components may be mixed in a single component
* hierarchy. However, for correct operating of such a mixed hierarchy of
* components, the whole hierarchy must be valid. When the hierarchy gets
* invalidated, like after changing the bounds of components, or
* adding/removing components to/from containers, the whole hierarchy must be
* validated afterwards by means of the {@link Container#validate()} method
* invoked on the top-most invalid container of the hierarchy.
*
* <h3>Serialization</h3>
* It is important to note that only AWT listeners which conform
* to the <code>Serializable</code> protocol will be saved when
* the object is stored. If an AWT object has listeners that
* aren't marked serializable, they will be dropped at
* <code>writeObject</code> time. Developers will need, as always,
* to consider the implications of making an object serializable.
* One situation to watch out for is this:
* <pre>
* import java.awt.*;
* import java.awt.event.*;
* import java.io.Serializable;
*
* class MyApp implements ActionListener, Serializable
* {
* BigObjectThatShouldNotBeSerializedWithAButton bigOne;
* Button aButton = new Button();
*
* MyApp()
* {
* // Oops, now aButton has a listener with a reference
* // to bigOne!
* aButton.addActionListener(this);
* }
*
* public void actionPerformed(ActionEvent e)
* {
* System.out.println("Hello There");
* }
* }
* </pre>
* In this example, serializing <code>aButton</code> by itself
* will cause <code>MyApp</code> and everything it refers to
* to be serialized as well. The problem is that the listener
* is serializable by coincidence, not by design. To separate
* the decisions about <code>MyApp</code> and the
* <code>ActionListener</code> being serializable one can use a
* nested class, as in the following example:
* <pre>
* import java.awt.*;
* import java.awt.event.*;
* import java.io.Serializable;
*
* class MyApp implements java.io.Serializable
* {
* BigObjectThatShouldNotBeSerializedWithAButton bigOne;
* Button aButton = new Button();
*
* static class MyActionListener implements ActionListener
* {
* public void actionPerformed(ActionEvent e)
* {
* System.out.println("Hello There");
* }
* }
*
* MyApp()
* {
* aButton.addActionListener(new MyActionListener());
* }
* }
* </pre>
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
* <p>
* For details on the focus subsystem, see
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
* How to Use the Focus Subsystem</a>,
* a section in <em>The Java Tutorial</em>, and the
* <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* for more information.
*
* @author Arthur van Hoff
* @author Sami Shaio
*/
public abstract class Component implements ImageObserver, MenuContainer,
Serializable
{
private static final PlatformLogger log = PlatformLogger.getLogger("java.awt.Component");
private static final PlatformLogger eventLog = PlatformLogger.getLogger("java.awt.event.Component");
private static final PlatformLogger focusLog = PlatformLogger.getLogger("java.awt.focus.Component");
private static final PlatformLogger mixingLog = PlatformLogger.getLogger("java.awt.mixing.Component");
/**
* The peer of the component. The peer implements the component's
* behavior. The peer is set when the <code>Component</code> is
* added to a container that also is a peer.
* @see #addNotify
* @see #removeNotify
*/
transient ComponentPeer peer;
/**
* The parent of the object. It may be <code>null</code>
* for top-level components.
* @see #getParent
*/
transient Container parent;
/**
* The <code>AppContext</code> of the component. Applets/Plugin may
* change the AppContext.
*/
transient AppContext appContext;
/**
* The x position of the component in the parent's coordinate system.
*
* @serial
* @see #getLocation
*/
int x;
/**
* The y position of the component in the parent's coordinate system.
*
* @serial
* @see #getLocation
*/
int y;
/**
* The width of the component.
*
* @serial
* @see #getSize
*/
int width;
/**
* The height of the component.
*
* @serial
* @see #getSize
*/
int height;
/**
* The foreground color for this component.
* <code>foreground</code> can be <code>null</code>.
*
* @serial
* @see #getForeground
* @see #setForeground
*/
Color foreground;
/**
* The background color for this component.
* <code>background</code> can be <code>null</code>.
*
* @serial
* @see #getBackground
* @see #setBackground
*/
Color background;
/**
* The font used by this component.
* The <code>font</code> can be <code>null</code>.
*
* @serial
* @see #getFont
* @see #setFont
*/
volatile Font font;
/**
* The font which the peer is currently using.
* (<code>null</code> if no peer exists.)
*/
Font peerFont;
/**
* The cursor displayed when pointer is over this component.
* This value can be <code>null</code>.
*
* @serial
* @see #getCursor
* @see #setCursor
*/
Cursor cursor;
/**
* The locale for the component.
*
* @serial
* @see #getLocale
* @see #setLocale
*/
Locale locale;
/**
* A reference to a <code>GraphicsConfiguration</code> object
* used to describe the characteristics of a graphics
* destination.
* This value can be <code>null</code>.
*
* @since 1.3
* @serial
* @see GraphicsConfiguration
* @see #getGraphicsConfiguration
*/
private transient GraphicsConfiguration graphicsConfig = null;
/**
* A reference to a <code>BufferStrategy</code> object
* used to manipulate the buffers on this component.
*
* @since 1.4
* @see java.awt.image.BufferStrategy
* @see #getBufferStrategy()
*/
transient BufferStrategy bufferStrategy = null;
/**
* True when the object should ignore all repaint events.
*
* @since 1.4
* @serial
* @see #setIgnoreRepaint
* @see #getIgnoreRepaint
*/
boolean ignoreRepaint = false;
/**
* True when the object is visible. An object that is not
* visible is not drawn on the screen.
*
* @serial
* @see #isVisible
* @see #setVisible
*/
boolean visible = true;
/**
* True when the object is enabled. An object that is not
* enabled does not interact with the user.
*
* @serial
* @see #isEnabled
* @see #setEnabled
*/
boolean enabled = true;
/**
* True when the object is valid. An invalid object needs to
* be layed out. This flag is set to false when the object
* size is changed.
*
* @serial
* @see #isValid
* @see #validate
* @see #invalidate
*/
private volatile boolean valid = false;
/**
* The <code>DropTarget</code> associated with this component.
*
* @since 1.2
* @serial
* @see #setDropTarget
* @see #getDropTarget
*/
DropTarget dropTarget;
/**
* @serial
* @see #add
*/
Vector<PopupMenu> popups;
/**
* A component's name.
* This field can be <code>null</code>.
*
* @serial
* @see #getName
* @see #setName(String)
*/
private String name;
/**
* A bool to determine whether the name has
* been set explicitly. <code>nameExplicitlySet</code> will
* be false if the name has not been set and
* true if it has.
*
* @serial
* @see #getName
* @see #setName(String)
*/
private boolean nameExplicitlySet = false;
/**
* Indicates whether this Component can be focused.
*
* @serial
* @see #setFocusable
* @see #isFocusable
* @since 1.4
*/
private boolean focusable = true;
private static final int FOCUS_TRAVERSABLE_UNKNOWN = 0;
private static final int FOCUS_TRAVERSABLE_DEFAULT = 1;
private static final int FOCUS_TRAVERSABLE_SET = 2;
/**
* Tracks whether this Component is relying on default focus travesability.
*
* @serial
* @since 1.4
*/
private int isFocusTraversableOverridden = FOCUS_TRAVERSABLE_UNKNOWN;
/**
* The focus traversal keys. These keys will generate focus traversal
* behavior for Components for which focus traversal keys are enabled. If a
* value of null is specified for a traversal key, this Component inherits
* that traversal key from its parent. If all ancestors of this Component
* have null specified for that traversal key, then the current
* KeyboardFocusManager's default traversal key is used.
*
* @serial
* @see #setFocusTraversalKeys
* @see #getFocusTraversalKeys
* @since 1.4
*/
Set<AWTKeyStroke>[] focusTraversalKeys;
private static final String[] focusTraversalKeyPropertyNames = {
"forwardFocusTraversalKeys",
"backwardFocusTraversalKeys",
"upCycleFocusTraversalKeys",
"downCycleFocusTraversalKeys"
};
/**
* Indicates whether focus traversal keys are enabled for this Component.
* Components for which focus traversal keys are disabled receive key
* events for focus traversal keys. Components for which focus traversal
* keys are enabled do not see these events; instead, the events are
* automatically converted to traversal operations.
*
* @serial
* @see #setFocusTraversalKeysEnabled
* @see #getFocusTraversalKeysEnabled
* @since 1.4
*/
private boolean focusTraversalKeysEnabled = true;
/**
* The locking object for AWT component-tree and layout operations.
*
* @see #getTreeLock
*/
static final Object LOCK = new AWTTreeLock();
static class AWTTreeLock {}
/*
* The component's AccessControlContext.
*/
private transient volatile AccessControlContext acc =
AccessController.getContext();
/**
* Minimum size.
* (This field perhaps should have been transient).
*
* @serial
*/
Dimension minSize;
/**
* Whether or not setMinimumSize has been invoked with a non-null value.
*/
boolean minSizeSet;
/**
* Preferred size.
* (This field perhaps should have been transient).
*
* @serial
*/
Dimension prefSize;
/**
* Whether or not setPreferredSize has been invoked with a non-null value.
*/
boolean prefSizeSet;
/**
* Maximum size
*
* @serial
*/
Dimension maxSize;
/**
* Whether or not setMaximumSize has been invoked with a non-null value.
*/
boolean maxSizeSet;
/**
* The orientation for this component.
* @see #getComponentOrientation
* @see #setComponentOrientation
*/
transient ComponentOrientation componentOrientation
= ComponentOrientation.UNKNOWN;
/**
* <code>newEventsOnly</code> will be true if the event is
* one of the event types enabled for the component.
* It will then allow for normal processing to
* continue. If it is false the event is passed
* to the component's parent and up the ancestor
* tree until the event has been consumed.
*
* @serial
* @see #dispatchEvent
*/
boolean newEventsOnly = false;
transient ComponentListener componentListener;
transient FocusListener focusListener;
transient HierarchyListener hierarchyListener;
transient HierarchyBoundsListener hierarchyBoundsListener;
transient KeyListener keyListener;
transient MouseListener mouseListener;
transient MouseMotionListener mouseMotionListener;
transient MouseWheelListener mouseWheelListener;
transient InputMethodListener inputMethodListener;
transient RuntimeException windowClosingException = null;
/** Internal, constants for serialization */
final static String actionListenerK = "actionL";
final static String adjustmentListenerK = "adjustmentL";
final static String componentListenerK = "componentL";
final static String containerListenerK = "containerL";
final static String focusListenerK = "focusL";
final static String itemListenerK = "itemL";
final static String keyListenerK = "keyL";
final static String mouseListenerK = "mouseL";
final static String mouseMotionListenerK = "mouseMotionL";
final static String mouseWheelListenerK = "mouseWheelL";
final static String textListenerK = "textL";
final static String ownedWindowK = "ownedL";
final static String windowListenerK = "windowL";
final static String inputMethodListenerK = "inputMethodL";
final static String hierarchyListenerK = "hierarchyL";
final static String hierarchyBoundsListenerK = "hierarchyBoundsL";
final static String windowStateListenerK = "windowStateL";
final static String windowFocusListenerK = "windowFocusL";
/**
* The <code>eventMask</code> is ONLY set by subclasses via
* <code>enableEvents</code>.
* The mask should NOT be set when listeners are registered
* so that we can distinguish the difference between when
* listeners request events and subclasses request them.
* One bit is used to indicate whether input methods are
* enabled; this bit is set by <code>enableInputMethods</code> and is
* on by default.
*
* @serial
* @see #enableInputMethods
* @see AWTEvent
*/
long eventMask = AWTEvent.INPUT_METHODS_ENABLED_MASK;
/**
* Static properties for incremental drawing.
* @see #imageUpdate
*/
static boolean isInc;
static int incRate;
static {
/* ensure that the necessary native libraries are loaded */
Toolkit.loadLibraries();
/* initialize JNI field and method ids */
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
String s = java.security.AccessController.doPrivileged(
new GetPropertyAction("awt.image.incrementaldraw"));
isInc = (s == null || s.equals("true"));
s = java.security.AccessController.doPrivileged(
new GetPropertyAction("awt.image.redrawrate"));
incRate = (s != null) ? Integer.parseInt(s) : 100;
}
/**
* Ease-of-use constant for <code>getAlignmentY()</code>.
* Specifies an alignment to the top of the component.
* @see #getAlignmentY
*/
public static final float TOP_ALIGNMENT = 0.0f;
/**
* Ease-of-use constant for <code>getAlignmentY</code> and
* <code>getAlignmentX</code>. Specifies an alignment to
* the center of the component
* @see #getAlignmentX
* @see #getAlignmentY
*/
public static final float CENTER_ALIGNMENT = 0.5f;
/**
* Ease-of-use constant for <code>getAlignmentY</code>.
* Specifies an alignment to the bottom of the component.
* @see #getAlignmentY
*/
public static final float BOTTOM_ALIGNMENT = 1.0f;
/**
* Ease-of-use constant for <code>getAlignmentX</code>.
* Specifies an alignment to the left side of the component.
* @see #getAlignmentX
*/
public static final float LEFT_ALIGNMENT = 0.0f;
/**
* Ease-of-use constant for <code>getAlignmentX</code>.
* Specifies an alignment to the right side of the component.
* @see #getAlignmentX
*/
public static final float RIGHT_ALIGNMENT = 1.0f;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -7644114512714619750L;
/**
* If any <code>PropertyChangeListeners</code> have been registered,
* the <code>changeSupport</code> field describes them.
*
* @serial
* @since 1.2
* @see #addPropertyChangeListener
* @see #removePropertyChangeListener
* @see #firePropertyChange
*/
private PropertyChangeSupport changeSupport;
/*
* In some cases using "this" as an object to synchronize by
* can lead to a deadlock if client code also uses synchronization
* by a component object. For every such situation revealed we should
* consider possibility of replacing "this" with the package private
* objectLock object introduced below. So far there're 3 issues known:
* - CR 6708322 (the getName/setName methods);
* - CR 6608764 (the PropertyChangeListener machinery);
* - CR 7108598 (the Container.paint/KeyboardFocusManager.clearMostRecentFocusOwner methods).
*
* Note: this field is considered final, though readObject() prohibits
* initializing final fields.
*/
private transient Object objectLock = new Object();
Object getObjectLock() {
return objectLock;
}
/*
* Returns the acc this component was constructed with.
*/
final AccessControlContext getAccessControlContext() {
if (acc == null) {
throw new SecurityException("Component is missing AccessControlContext");
}
return acc;
}
boolean isPacked = false;
/**
* Pseudoparameter for direct Geometry API (setLocation, setBounds setSize
* to signal setBounds what's changing. Should be used under TreeLock.
* This is only needed due to the inability to change the cross-calling
* order of public and deprecated methods.
*/
private int boundsOp = ComponentPeer.DEFAULT_OPERATION;
/**
* Enumeration of the common ways the baseline of a component can
* change as the size changes. The baseline resize behavior is
* primarily for layout managers that need to know how the
* position of the baseline changes as the component size changes.
* In general the baseline resize behavior will be valid for sizes
* greater than or equal to the minimum size (the actual minimum
* size; not a developer specified minimum size). For sizes
* smaller than the minimum size the baseline may change in a way
* other than the baseline resize behavior indicates. Similarly,
* as the size approaches <code>Integer.MAX_VALUE</code> and/or
* <code>Short.MAX_VALUE</code> the baseline may change in a way
* other than the baseline resize behavior indicates.
*
* @see #getBaselineResizeBehavior
* @see #getBaseline(int,int)
* @since 1.6
*/
public enum BaselineResizeBehavior {
/**
* Indicates the baseline remains fixed relative to the
* y-origin. That is, <code>getBaseline</code> returns
* the same value regardless of the height or width. For example, a
* <code>JLabel</code> containing non-empty text with a
* vertical alignment of <code>TOP</code> should have a
* baseline type of <code>CONSTANT_ASCENT</code>.
*/
CONSTANT_ASCENT,
/**
* Indicates the baseline remains fixed relative to the height
* and does not change as the width is varied. That is, for
* any height H the difference between H and
* <code>getBaseline(w, H)</code> is the same. For example, a
* <code>JLabel</code> containing non-empty text with a
* vertical alignment of <code>BOTTOM</code> should have a
* baseline type of <code>CONSTANT_DESCENT</code>.
*/
CONSTANT_DESCENT,
/**
* Indicates the baseline remains a fixed distance from
* the center of the component. That is, for any height H the
* difference between <code>getBaseline(w, H)</code> and
* <code>H / 2</code> is the same (plus or minus one depending upon
* rounding error).
* <p>
* Because of possible rounding errors it is recommended
* you ask for the baseline with two consecutive heights and use
* the return value to determine if you need to pad calculations
* by 1. The following shows how to calculate the baseline for
* any height:
* <pre>
* Dimension preferredSize = component.getPreferredSize();
* int baseline = getBaseline(preferredSize.width,
* preferredSize.height);
* int nextBaseline = getBaseline(preferredSize.width,
* preferredSize.height + 1);
* // Amount to add to height when calculating where baseline
* // lands for a particular height:
* int padding = 0;
* // Where the baseline is relative to the mid point
* int baselineOffset = baseline - height / 2;
* if (preferredSize.height % 2 == 0 &&
* baseline != nextBaseline) {
* padding = 1;
* }
* else if (preferredSize.height % 2 == 1 &&
* baseline == nextBaseline) {
* baselineOffset--;
* padding = 1;
* }
* // The following calculates where the baseline lands for
* // the height z:
* int calculatedBaseline = (z + padding) / 2 + baselineOffset;
* </pre>
*/
CENTER_OFFSET,
/**
* Indicates the baseline resize behavior can not be expressed using
* any of the other constants. This may also indicate the baseline
* varies with the width of the component. This is also returned
* by components that do not have a baseline.
*/
OTHER
}
/*
* The shape set with the applyCompoundShape() method. It uncludes the result
* of the HW/LW mixing related shape computation. It may also include
* the user-specified shape of the component.
* The 'null' value means the component has normal shape (or has no shape at all)
* and applyCompoundShape() will skip the following shape identical to normal.
*/
private transient Region compoundShape = null;
/*
* Represents the shape of this lightweight component to be cut out from
* heavyweight components should they intersect. Possible values:
* 1. null - consider the shape rectangular
* 2. EMPTY_REGION - nothing gets cut out (children still get cut out)
* 3. non-empty - this shape gets cut out.
*/
private transient Region mixingCutoutRegion = null;
/*
* Indicates whether addNotify() is complete
* (i.e. the peer is created).
*/
private transient boolean isAddNotifyComplete = false;
/**
* Should only be used in subclass getBounds to check that part of bounds
* is actualy changing
*/
int getBoundsOp() {
assert Thread.holdsLock(getTreeLock());
return boundsOp;
}
void setBoundsOp(int op) {
assert Thread.holdsLock(getTreeLock());
if (op == ComponentPeer.RESET_OPERATION) {
boundsOp = ComponentPeer.DEFAULT_OPERATION;
} else
if (boundsOp == ComponentPeer.DEFAULT_OPERATION) {
boundsOp = op;
}
}
// Whether this Component has had the background erase flag
// specified via SunToolkit.disableBackgroundErase(). This is
// needed in order to make this function work on X11 platforms,
// where currently there is no chance to interpose on the creation
// of the peer and therefore the call to XSetBackground.
transient boolean backgroundEraseDisabled;
static {
AWTAccessor.setComponentAccessor(new AWTAccessor.ComponentAccessor() {
public void setBackgroundEraseDisabled(Component comp, boolean disabled) {
comp.backgroundEraseDisabled = disabled;
}
public boolean getBackgroundEraseDisabled(Component comp) {
return comp.backgroundEraseDisabled;
}
public Rectangle getBounds(Component comp) {
return new Rectangle(comp.x, comp.y, comp.width, comp.height);
}
public void setMixingCutoutShape(Component comp, Shape shape) {
Region region = shape == null ? null :
Region.getInstance(shape, null);
synchronized (comp.getTreeLock()) {
boolean needShowing = false;
boolean needHiding = false;
if (!comp.isNonOpaqueForMixing()) {
needHiding = true;
}
comp.mixingCutoutRegion = region;
if (!comp.isNonOpaqueForMixing()) {
needShowing = true;
}
if (comp.isMixingNeeded()) {
if (needHiding) {
comp.mixOnHiding(comp.isLightweight());
}
if (needShowing) {
comp.mixOnShowing();
}
}
}
}
public void setGraphicsConfiguration(Component comp,
GraphicsConfiguration gc)
{
comp.setGraphicsConfiguration(gc);
}
public boolean requestFocus(Component comp, CausedFocusEvent.Cause cause) {
return comp.requestFocus(cause);
}
public boolean canBeFocusOwner(Component comp) {
return comp.canBeFocusOwner();
}
public boolean isVisible(Component comp) {
return comp.isVisible_NoClientCode();
}
public void setRequestFocusController
(RequestFocusController requestController)
{
Component.setRequestFocusController(requestController);
}
public AppContext getAppContext(Component comp) {
return comp.appContext;
}
public void setAppContext(Component comp, AppContext appContext) {
comp.appContext = appContext;
}
public Container getParent(Component comp) {
return comp.getParent_NoClientCode();
}
public void setParent(Component comp, Container parent) {
comp.parent = parent;
}
public void setSize(Component comp, int width, int height) {
comp.width = width;
comp.height = height;
}
public Point getLocation(Component comp) {
return comp.location_NoClientCode();
}
public void setLocation(Component comp, int x, int y) {
comp.x = x;
comp.y = y;
}
public boolean isEnabled(Component comp) {
return comp.isEnabledImpl();
}
public boolean isDisplayable(Component comp) {
return comp.peer != null;
}
public Cursor getCursor(Component comp) {
return comp.getCursor_NoClientCode();
}
public ComponentPeer getPeer(Component comp) {
return comp.peer;
}
public void setPeer(Component comp, ComponentPeer peer) {
comp.peer = peer;
}
public boolean isLightweight(Component comp) {
return (comp.peer instanceof LightweightPeer);
}
public boolean getIgnoreRepaint(Component comp) {
return comp.ignoreRepaint;
}
public int getWidth(Component comp) {
return comp.width;
}
public int getHeight(Component comp) {
return comp.height;
}
public int getX(Component comp) {
return comp.x;
}
public int getY(Component comp) {
return comp.y;
}
public Color getForeground(Component comp) {
return comp.foreground;
}
public Color getBackground(Component comp) {
return comp.background;
}
public void setBackground(Component comp, Color background) {
comp.background = background;
}
public Font getFont(Component comp) {
return comp.getFont_NoClientCode();
}
public void processEvent(Component comp, AWTEvent e) {
comp.processEvent(e);
}
public AccessControlContext getAccessControlContext(Component comp) {
return comp.getAccessControlContext();
}
public void revalidateSynchronously(Component comp) {
comp.revalidateSynchronously();
}
});
}
/**
* Constructs a new component. Class <code>Component</code> can be
* extended directly to create a lightweight component that does not
* utilize an opaque native window. A lightweight component must be
* hosted by a native container somewhere higher up in the component
* tree (for example, by a <code>Frame</code> object).
*/
protected Component() {
appContext = AppContext.getAppContext();
}
@SuppressWarnings({"rawtypes", "unchecked"})
void initializeFocusTraversalKeys() {
focusTraversalKeys = new Set[3];
}
/**
* Constructs a name for this component. Called by <code>getName</code>
* when the name is <code>null</code>.
*/
String constructComponentName() {
return null; // For strict compliance with prior platform versions, a Component
// that doesn't set its name should return null from
// getName()
}
/**
* Gets the name of the component.
* @return this component's name
* @see #setName
* @since JDK1.1
*/
public String getName() {
if (name == null && !nameExplicitlySet) {
synchronized(getObjectLock()) {
if (name == null && !nameExplicitlySet)
name = constructComponentName();
}
}
return name;
}
/**
* Sets the name of the component to the specified string.
* @param name the string that is to be this
* component's name
* @see #getName
* @since JDK1.1
*/
public void setName(String name) {
String oldName;
synchronized(getObjectLock()) {
oldName = this.name;
this.name = name;
nameExplicitlySet = true;
}
firePropertyChange("name", oldName, name);
}
/**
* Gets the parent of this component.
* @return the parent container of this component
* @since JDK1.0
*/
public Container getParent() {
return getParent_NoClientCode();
}
// NOTE: This method may be called by privileged threads.
// This functionality is implemented in a package-private method
// to insure that it cannot be overridden by client subclasses.
// DO NOT INVOKE CLIENT CODE ON THIS THREAD!
final Container getParent_NoClientCode() {
return parent;
}
// This method is overridden in the Window class to return null,
// because the parent field of the Window object contains
// the owner of the window, not its parent.
Container getContainer() {
return getParent_NoClientCode();
}
/**
* @deprecated As of JDK version 1.1,
* programs should not directly manipulate peers;
* replaced by <code>boolean isDisplayable()</code>.
*/
@Deprecated
public ComponentPeer getPeer() {
return peer;
}
/**
* Associate a <code>DropTarget</code> with this component.
* The <code>Component</code> will receive drops only if it
* is enabled.
*
* @see #isEnabled
* @param dt The DropTarget
*/
public synchronized void setDropTarget(DropTarget dt) {
if (dt == dropTarget || (dropTarget != null && dropTarget.equals(dt)))
return;
DropTarget old;
if ((old = dropTarget) != null) {
if (peer != null) dropTarget.removeNotify(peer);
DropTarget t = dropTarget;
dropTarget = null;
try {
t.setComponent(null);
} catch (IllegalArgumentException iae) {
// ignore it.
}
}
// if we have a new one, and we have a peer, add it!
if ((dropTarget = dt) != null) {
try {
dropTarget.setComponent(this);
if (peer != null) dropTarget.addNotify(peer);
} catch (IllegalArgumentException iae) {
if (old != null) {
try {
old.setComponent(this);
if (peer != null) dropTarget.addNotify(peer);
} catch (IllegalArgumentException iae1) {
// ignore it!
}
}
}
}
}
/**
* Gets the <code>DropTarget</code> associated with this
* <code>Component</code>.
*/
public synchronized DropTarget getDropTarget() { return dropTarget; }
/**
* Gets the <code>GraphicsConfiguration</code> associated with this
* <code>Component</code>.
* If the <code>Component</code> has not been assigned a specific
* <code>GraphicsConfiguration</code>,
* the <code>GraphicsConfiguration</code> of the
* <code>Component</code> object's top-level container is
* returned.
* If the <code>Component</code> has been created, but not yet added
* to a <code>Container</code>, this method returns <code>null</code>.
*
* @return the <code>GraphicsConfiguration</code> used by this
* <code>Component</code> or <code>null</code>
* @since 1.3
*/
public GraphicsConfiguration getGraphicsConfiguration() {
synchronized(getTreeLock()) {
return getGraphicsConfiguration_NoClientCode();
}
}
final GraphicsConfiguration getGraphicsConfiguration_NoClientCode() {
return graphicsConfig;
}
void setGraphicsConfiguration(GraphicsConfiguration gc) {
synchronized(getTreeLock()) {
if (updateGraphicsData(gc)) {
removeNotify();
addNotify();
}
}
}
boolean updateGraphicsData(GraphicsConfiguration gc) {
checkTreeLock();
if (graphicsConfig == gc) {
return false;
}
graphicsConfig = gc;
ComponentPeer peer = getPeer();
if (peer != null) {
return peer.updateGraphicsData(gc);
}
return false;
}
/**
* Checks that this component's <code>GraphicsDevice</code>
* <code>idString</code> matches the string argument.
*/
void checkGD(String stringID) {
if (graphicsConfig != null) {
if (!graphicsConfig.getDevice().getIDstring().equals(stringID)) {
throw new IllegalArgumentException(
"adding a container to a container on a different GraphicsDevice");
}
}
}
/**
* Gets this component's locking object (the object that owns the thread
* synchronization monitor) for AWT component-tree and layout
* operations.
* @return this component's locking object
*/
public final Object getTreeLock() {
return LOCK;
}
final void checkTreeLock() {
if (!Thread.holdsLock(getTreeLock())) {
throw new IllegalStateException("This function should be called while holding treeLock");
}
}
/**
* Gets the toolkit of this component. Note that
* the frame that contains a component controls which
* toolkit is used by that component. Therefore if the component
* is moved from one frame to another, the toolkit it uses may change.
* @return the toolkit of this component
* @since JDK1.0
*/
public Toolkit getToolkit() {
return getToolkitImpl();
}
/*
* This is called by the native code, so client code can't
* be called on the toolkit thread.
*/
final Toolkit getToolkitImpl() {
Container parent = this.parent;
if (parent != null) {
return parent.getToolkitImpl();
}
return Toolkit.getDefaultToolkit();
}
/**
* Determines whether this component is valid. A component is valid
* when it is correctly sized and positioned within its parent
* container and all its children are also valid.
* In order to account for peers' size requirements, components are invalidated
* before they are first shown on the screen. By the time the parent container
* is fully realized, all its components will be valid.
* @return <code>true</code> if the component is valid, <code>false</code>
* otherwise
* @see #validate
* @see #invalidate
* @since JDK1.0
*/
public boolean isValid() {
return (peer != null) && valid;
}
/**
* Determines whether this component is displayable. A component is
* displayable when it is connected to a native screen resource.
* <p>
* A component is made displayable either when it is added to
* a displayable containment hierarchy or when its containment
* hierarchy is made displayable.
* A containment hierarchy is made displayable when its ancestor
* window is either packed or made visible.
* <p>
* A component is made undisplayable either when it is removed from
* a displayable containment hierarchy or when its containment hierarchy
* is made undisplayable. A containment hierarchy is made
* undisplayable when its ancestor window is disposed.
*
* @return <code>true</code> if the component is displayable,
* <code>false</code> otherwise
* @see Container#add(Component)
* @see Window#pack
* @see Window#show
* @see Container#remove(Component)
* @see Window#dispose
* @since 1.2
*/
public boolean isDisplayable() {
return getPeer() != null;
}
/**
* Determines whether this component should be visible when its
* parent is visible. Components are
* initially visible, with the exception of top level components such
* as <code>Frame</code> objects.
* @return <code>true</code> if the component is visible,
* <code>false</code> otherwise
* @see #setVisible
* @since JDK1.0
*/
@Transient
public boolean isVisible() {
return isVisible_NoClientCode();
}
final boolean isVisible_NoClientCode() {
return visible;
}
/**
* Determines whether this component will be displayed on the screen.
* @return <code>true</code> if the component and all of its ancestors
* until a toplevel window or null parent are visible,
* <code>false</code> otherwise
*/
boolean isRecursivelyVisible() {
return visible && (parent == null || parent.isRecursivelyVisible());
}
/**
* Translates absolute coordinates into coordinates in the coordinate
* space of this component.
*/
Point pointRelativeToComponent(Point absolute) {
Point compCoords = getLocationOnScreen();
return new Point(absolute.x - compCoords.x,
absolute.y - compCoords.y);
}
/**
* Assuming that mouse location is stored in PointerInfo passed
* to this method, it finds a Component that is in the same
* Window as this Component and is located under the mouse pointer.
* If no such Component exists, null is returned.
* NOTE: this method should be called under the protection of
* tree lock, as it is done in Component.getMousePosition() and
* Container.getMousePosition(boolean).
*/
Component findUnderMouseInWindow(PointerInfo pi) {
if (!isShowing()) {
return null;
}
Window win = getContainingWindow();
if (!Toolkit.getDefaultToolkit().getMouseInfoPeer().isWindowUnderMouse(win)) {
return null;
}
final boolean INCLUDE_DISABLED = true;
Point relativeToWindow = win.pointRelativeToComponent(pi.getLocation());
Component inTheSameWindow = win.findComponentAt(relativeToWindow.x,
relativeToWindow.y,
INCLUDE_DISABLED);
return inTheSameWindow;
}
/**
* Returns the position of the mouse pointer in this <code>Component</code>'s
* coordinate space if the <code>Component</code> is directly under the mouse
* pointer, otherwise returns <code>null</code>.
* If the <code>Component</code> is not showing on the screen, this method
* returns <code>null</code> even if the mouse pointer is above the area
* where the <code>Component</code> would be displayed.
* If the <code>Component</code> is partially or fully obscured by other
* <code>Component</code>s or native windows, this method returns a non-null
* value only if the mouse pointer is located above the unobscured part of the
* <code>Component</code>.
* <p>
* For <code>Container</code>s it returns a non-null value if the mouse is
* above the <code>Container</code> itself or above any of its descendants.
* Use {@link Container#getMousePosition(boolean)} if you need to exclude children.
* <p>
* Sometimes the exact mouse coordinates are not important, and the only thing
* that matters is whether a specific <code>Component</code> is under the mouse
* pointer. If the return value of this method is <code>null</code>, mouse
* pointer is not directly above the <code>Component</code>.
*
* @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
* @see #isShowing
* @see Container#getMousePosition
* @return mouse coordinates relative to this <code>Component</code>, or null
* @since 1.5
*/
public Point getMousePosition() throws HeadlessException {
if (GraphicsEnvironment.isHeadless()) {
throw new HeadlessException();
}
PointerInfo pi = java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<PointerInfo>() {
public PointerInfo run() {
return MouseInfo.getPointerInfo();
}
}
);
synchronized (getTreeLock()) {
Component inTheSameWindow = findUnderMouseInWindow(pi);
if (!isSameOrAncestorOf(inTheSameWindow, true)) {
return null;
}
return pointRelativeToComponent(pi.getLocation());
}
}
/**
* Overridden in Container. Must be called under TreeLock.
*/
boolean isSameOrAncestorOf(Component comp, boolean allowChildren) {
return comp == this;
}
/**
* Determines whether this component is showing on screen. This means
* that the component must be visible, and it must be in a container
* that is visible and showing.
* <p>
* <strong>Note:</strong> sometimes there is no way to detect whether the
* {@code Component} is actually visible to the user. This can happen when:
* <ul>
* <li>the component has been added to a visible {@code ScrollPane} but
* the {@code Component} is not currently in the scroll pane's view port.
* <li>the {@code Component} is obscured by another {@code Component} or
* {@code Container}.
* </ul>
* @return <code>true</code> if the component is showing,
* <code>false</code> otherwise
* @see #setVisible
* @since JDK1.0
*/
public boolean isShowing() {
if (visible && (peer != null)) {
Container parent = this.parent;
return (parent == null) || parent.isShowing();
}
return false;
}
/**
* Determines whether this component is enabled. An enabled component
* can respond to user input and generate events. Components are
* enabled initially by default. A component may be enabled or disabled by
* calling its <code>setEnabled</code> method.
* @return <code>true</code> if the component is enabled,
* <code>false</code> otherwise
* @see #setEnabled
* @since JDK1.0
*/
public boolean isEnabled() {
return isEnabledImpl();
}
/*
* This is called by the native code, so client code can't
* be called on the toolkit thread.
*/
final boolean isEnabledImpl() {
return enabled;
}
/**
* Enables or disables this component, depending on the value of the
* parameter <code>b</code>. An enabled component can respond to user
* input and generate events. Components are enabled initially by default.
*
* <p>Note: Disabling a lightweight component does not prevent it from
* receiving MouseEvents.
* <p>Note: Disabling a heavyweight container prevents all components
* in this container from receiving any input events. But disabling a
* lightweight container affects only this container.
*
* @param b If <code>true</code>, this component is
* enabled; otherwise this component is disabled
* @see #isEnabled
* @see #isLightweight
* @since JDK1.1
*/
public void setEnabled(boolean b) {
enable(b);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setEnabled(boolean)</code>.
*/
@Deprecated
public void enable() {
if (!enabled) {
synchronized (getTreeLock()) {
enabled = true;
ComponentPeer peer = this.peer;
if (peer != null) {
peer.setEnabled(true);
if (visible) {
updateCursorImmediately();
}
}
}
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, AccessibleState.ENABLED);
}
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setEnabled(boolean)</code>.
*/
@Deprecated
public void enable(boolean b) {
if (b) {
enable();
} else {
disable();
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setEnabled(boolean)</code>.
*/
@Deprecated
public void disable() {
if (enabled) {
KeyboardFocusManager.clearMostRecentFocusOwner(this);
synchronized (getTreeLock()) {
enabled = false;
// A disabled lw container is allowed to contain a focus owner.
if ((isFocusOwner() || (containsFocus() && !isLightweight())) &&
KeyboardFocusManager.isAutoFocusTransferEnabled())
{
// Don't clear the global focus owner. If transferFocus
// fails, we want the focus to stay on the disabled
// Component so that keyboard traversal, et. al. still
// makes sense to the user.
transferFocus(false);
}
ComponentPeer peer = this.peer;
if (peer != null) {
peer.setEnabled(false);
if (visible) {
updateCursorImmediately();
}
}
}
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, AccessibleState.ENABLED);
}
}
}
/**
* Returns true if this component is painted to an offscreen image
* ("buffer") that's copied to the screen later. Component
* subclasses that support double buffering should override this
* method to return true if double buffering is enabled.
*
* @return false by default
*/
public boolean isDoubleBuffered() {
return false;
}
/**
* Enables or disables input method support for this component. If input
* method support is enabled and the component also processes key events,
* incoming events are offered to
* the current input method and will only be processed by the component or
* dispatched to its listeners if the input method does not consume them.
* By default, input method support is enabled.
*
* @param enable true to enable, false to disable
* @see #processKeyEvent
* @since 1.2
*/
public void enableInputMethods(boolean enable) {
if (enable) {
if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0)
return;
// If this component already has focus, then activate the
// input method by dispatching a synthesized focus gained
// event.
if (isFocusOwner()) {
InputContext inputContext = getInputContext();
if (inputContext != null) {
FocusEvent focusGainedEvent =
new FocusEvent(this, FocusEvent.FOCUS_GAINED);
inputContext.dispatchEvent(focusGainedEvent);
}
}
eventMask |= AWTEvent.INPUT_METHODS_ENABLED_MASK;
} else {
if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) {
InputContext inputContext = getInputContext();
if (inputContext != null) {
inputContext.endComposition();
inputContext.removeNotify(this);
}
}
eventMask &= ~AWTEvent.INPUT_METHODS_ENABLED_MASK;
}
}
/**
* Shows or hides this component depending on the value of parameter
* <code>b</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param b if <code>true</code>, shows this component;
* otherwise, hides this component
* @see #isVisible
* @see #invalidate
* @since JDK1.1
*/
public void setVisible(boolean b) {
show(b);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setVisible(boolean)</code>.
*/
@Deprecated
public void show() {
if (!visible) {
synchronized (getTreeLock()) {
visible = true;
mixOnShowing();
ComponentPeer peer = this.peer;
if (peer != null) {
peer.setVisible(true);
createHierarchyEvents(HierarchyEvent.HIERARCHY_CHANGED,
this, parent,
HierarchyEvent.SHOWING_CHANGED,
Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK));
if (peer instanceof LightweightPeer) {
repaint();
}
updateCursorImmediately();
}
if (componentListener != null ||
(eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 ||
Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK)) {
ComponentEvent e = new ComponentEvent(this,
ComponentEvent.COMPONENT_SHOWN);
Toolkit.getEventQueue().postEvent(e);
}
}
Container parent = this.parent;
if (parent != null) {
parent.invalidate();
}
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setVisible(boolean)</code>.
*/
@Deprecated
public void show(boolean b) {
if (b) {
show();
} else {
hide();
}
}
boolean containsFocus() {
return isFocusOwner();
}
void clearMostRecentFocusOwnerOnHide() {
KeyboardFocusManager.clearMostRecentFocusOwner(this);
}
void clearCurrentFocusCycleRootOnHide() {
/* do nothing */
}
/*
* Delete references from LightweithDispatcher of a heavyweight parent
*/
void clearLightweightDispatcherOnRemove(Component removedComponent) {
if (parent != null) {
parent.clearLightweightDispatcherOnRemove(removedComponent);
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setVisible(boolean)</code>.
*/
@Deprecated
public void hide() {
isPacked = false;
if (visible) {
clearCurrentFocusCycleRootOnHide();
clearMostRecentFocusOwnerOnHide();
synchronized (getTreeLock()) {
visible = false;
mixOnHiding(isLightweight());
if (containsFocus() && KeyboardFocusManager.isAutoFocusTransferEnabled()) {
transferFocus(true);
}
ComponentPeer peer = this.peer;
if (peer != null) {
peer.setVisible(false);
createHierarchyEvents(HierarchyEvent.HIERARCHY_CHANGED,
this, parent,
HierarchyEvent.SHOWING_CHANGED,
Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK));
if (peer instanceof LightweightPeer) {
repaint();
}
updateCursorImmediately();
}
if (componentListener != null ||
(eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 ||
Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK)) {
ComponentEvent e = new ComponentEvent(this,
ComponentEvent.COMPONENT_HIDDEN);
Toolkit.getEventQueue().postEvent(e);
}
}
Container parent = this.parent;
if (parent != null) {
parent.invalidate();
}
}
}
/**
* Gets the foreground color of this component.
* @return this component's foreground color; if this component does
* not have a foreground color, the foreground color of its parent
* is returned
* @see #setForeground
* @since JDK1.0
* @beaninfo
* bound: true
*/
@Transient
public Color getForeground() {
Color foreground = this.foreground;
if (foreground != null) {
return foreground;
}
Container parent = this.parent;
return (parent != null) ? parent.getForeground() : null;
}
/**
* Sets the foreground color of this component.
* @param c the color to become this component's
* foreground color; if this parameter is <code>null</code>
* then this component will inherit
* the foreground color of its parent
* @see #getForeground
* @since JDK1.0
*/
public void setForeground(Color c) {
Color oldColor = foreground;
ComponentPeer peer = this.peer;
foreground = c;
if (peer != null) {
c = getForeground();
if (c != null) {
peer.setForeground(c);
}
}
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("foreground", oldColor, c);
}
/**
* Returns whether the foreground color has been explicitly set for this
* Component. If this method returns <code>false</code>, this Component is
* inheriting its foreground color from an ancestor.
*
* @return <code>true</code> if the foreground color has been explicitly
* set for this Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean isForegroundSet() {
return (foreground != null);
}
/**
* Gets the background color of this component.
* @return this component's background color; if this component does
* not have a background color,
* the background color of its parent is returned
* @see #setBackground
* @since JDK1.0
*/
@Transient
public Color getBackground() {
Color background = this.background;
if (background != null) {
return background;
}
Container parent = this.parent;
return (parent != null) ? parent.getBackground() : null;
}
/**
* Sets the background color of this component.
* <p>
* The background color affects each component differently and the
* parts of the component that are affected by the background color
* may differ between operating systems.
*
* @param c the color to become this component's color;
* if this parameter is <code>null</code>, then this
* component will inherit the background color of its parent
* @see #getBackground
* @since JDK1.0
* @beaninfo
* bound: true
*/
public void setBackground(Color c) {
Color oldColor = background;
ComponentPeer peer = this.peer;
background = c;
if (peer != null) {
c = getBackground();
if (c != null) {
peer.setBackground(c);
}
}
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("background", oldColor, c);
}
/**
* Returns whether the background color has been explicitly set for this
* Component. If this method returns <code>false</code>, this Component is
* inheriting its background color from an ancestor.
*
* @return <code>true</code> if the background color has been explicitly
* set for this Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean isBackgroundSet() {
return (background != null);
}
/**
* Gets the font of this component.
* @return this component's font; if a font has not been set
* for this component, the font of its parent is returned
* @see #setFont
* @since JDK1.0
*/
@Transient
public Font getFont() {
return getFont_NoClientCode();
}
// NOTE: This method may be called by privileged threads.
// This functionality is implemented in a package-private method
// to insure that it cannot be overridden by client subclasses.
// DO NOT INVOKE CLIENT CODE ON THIS THREAD!
final Font getFont_NoClientCode() {
Font font = this.font;
if (font != null) {
return font;
}
Container parent = this.parent;
return (parent != null) ? parent.getFont_NoClientCode() : null;
}
/**
* Sets the font of this component.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param f the font to become this component's font;
* if this parameter is <code>null</code> then this
* component will inherit the font of its parent
* @see #getFont
* @see #invalidate
* @since JDK1.0
* @beaninfo
* bound: true
*/
public void setFont(Font f) {
Font oldFont, newFont;
synchronized(getTreeLock()) {
oldFont = font;
newFont = font = f;
ComponentPeer peer = this.peer;
if (peer != null) {
f = getFont();
if (f != null) {
peer.setFont(f);
peerFont = f;
}
}
}
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("font", oldFont, newFont);
// This could change the preferred size of the Component.
// Fix for 6213660. Should compare old and new fonts and do not
// call invalidate() if they are equal.
if (f != oldFont && (oldFont == null ||
!oldFont.equals(f))) {
invalidateIfValid();
}
}
/**
* Returns whether the font has been explicitly set for this Component. If
* this method returns <code>false</code>, this Component is inheriting its
* font from an ancestor.
*
* @return <code>true</code> if the font has been explicitly set for this
* Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean isFontSet() {
return (font != null);
}
/**
* Gets the locale of this component.
* @return this component's locale; if this component does not
* have a locale, the locale of its parent is returned
* @see #setLocale
* @exception IllegalComponentStateException if the <code>Component</code>
* does not have its own locale and has not yet been added to
* a containment hierarchy such that the locale can be determined
* from the containing parent
* @since JDK1.1
*/
public Locale getLocale() {
Locale locale = this.locale;
if (locale != null) {
return locale;
}
Container parent = this.parent;
if (parent == null) {
throw new IllegalComponentStateException("This component must have a parent in order to determine its locale");
} else {
return parent.getLocale();
}
}
/**
* Sets the locale of this component. This is a bound property.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param l the locale to become this component's locale
* @see #getLocale
* @see #invalidate
* @since JDK1.1
*/
public void setLocale(Locale l) {
Locale oldValue = locale;
locale = l;
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("locale", oldValue, l);
// This could change the preferred size of the Component.
invalidateIfValid();
}
/**
* Gets the instance of <code>ColorModel</code> used to display
* the component on the output device.
* @return the color model used by this component
* @see java.awt.image.ColorModel
* @see java.awt.peer.ComponentPeer#getColorModel()
* @see Toolkit#getColorModel()
* @since JDK1.0
*/
public ColorModel getColorModel() {
ComponentPeer peer = this.peer;
if ((peer != null) && ! (peer instanceof LightweightPeer)) {
return peer.getColorModel();
} else if (GraphicsEnvironment.isHeadless()) {
return ColorModel.getRGBdefault();
} // else
return getToolkit().getColorModel();
}
/**
* Gets the location of this component in the form of a
* point specifying the component's top-left corner.
* The location will be relative to the parent's coordinate space.
* <p>
* Due to the asynchronous nature of native event handling, this
* method can return outdated values (for instance, after several calls
* of <code>setLocation()</code> in rapid succession). For this
* reason, the recommended method of obtaining a component's position is
* within <code>java.awt.event.ComponentListener.componentMoved()</code>,
* which is called after the operating system has finished moving the
* component.
* </p>
* @return an instance of <code>Point</code> representing
* the top-left corner of the component's bounds in
* the coordinate space of the component's parent
* @see #setLocation
* @see #getLocationOnScreen
* @since JDK1.1
*/
public Point getLocation() {
return location();
}
/**
* Gets the location of this component in the form of a point
* specifying the component's top-left corner in the screen's
* coordinate space.
* @return an instance of <code>Point</code> representing
* the top-left corner of the component's bounds in the
* coordinate space of the screen
* @throws IllegalComponentStateException if the
* component is not showing on the screen
* @see #setLocation
* @see #getLocation
*/
public Point getLocationOnScreen() {
synchronized (getTreeLock()) {
return getLocationOnScreen_NoTreeLock();
}
}
/*
* a package private version of getLocationOnScreen
* used by GlobalCursormanager to update cursor
*/
final Point getLocationOnScreen_NoTreeLock() {
if (peer != null && isShowing()) {
if (peer instanceof LightweightPeer) {
// lightweight component location needs to be translated
// relative to a native component.
Container host = getNativeContainer();
Point pt = host.peer.getLocationOnScreen();
for(Component c = this; c != host; c = c.getParent()) {
pt.x += c.x;
pt.y += c.y;
}
return pt;
} else {
Point pt = peer.getLocationOnScreen();
return pt;
}
} else {
throw new IllegalComponentStateException("component must be showing on the screen to determine its location");
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getLocation()</code>.
*/
@Deprecated
public Point location() {
return location_NoClientCode();
}
private Point location_NoClientCode() {
return new Point(x, y);
}
/**
* Moves this component to a new location. The top-left corner of
* the new location is specified by the <code>x</code> and <code>y</code>
* parameters in the coordinate space of this component's parent.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param x the <i>x</i>-coordinate of the new location's
* top-left corner in the parent's coordinate space
* @param y the <i>y</i>-coordinate of the new location's
* top-left corner in the parent's coordinate space
* @see #getLocation
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void setLocation(int x, int y) {
move(x, y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setLocation(int, int)</code>.
*/
@Deprecated
public void move(int x, int y) {
synchronized(getTreeLock()) {
setBoundsOp(ComponentPeer.SET_LOCATION);
setBounds(x, y, width, height);
}
}
/**
* Moves this component to a new location. The top-left corner of
* the new location is specified by point <code>p</code>. Point
* <code>p</code> is given in the parent's coordinate space.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param p the point defining the top-left corner
* of the new location, given in the coordinate space of this
* component's parent
* @see #getLocation
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void setLocation(Point p) {
setLocation(p.x, p.y);
}
/**
* Returns the size of this component in the form of a
* <code>Dimension</code> object. The <code>height</code>
* field of the <code>Dimension</code> object contains
* this component's height, and the <code>width</code>
* field of the <code>Dimension</code> object contains
* this component's width.
* @return a <code>Dimension</code> object that indicates the
* size of this component
* @see #setSize
* @since JDK1.1
*/
public Dimension getSize() {
return size();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getSize()</code>.
*/
@Deprecated
public Dimension size() {
return new Dimension(width, height);
}
/**
* Resizes this component so that it has width <code>width</code>
* and height <code>height</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param width the new width of this component in pixels
* @param height the new height of this component in pixels
* @see #getSize
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void setSize(int width, int height) {
resize(width, height);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setSize(int, int)</code>.
*/
@Deprecated
public void resize(int width, int height) {
synchronized(getTreeLock()) {
setBoundsOp(ComponentPeer.SET_SIZE);
setBounds(x, y, width, height);
}
}
/**
* Resizes this component so that it has width <code>d.width</code>
* and height <code>d.height</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param d the dimension specifying the new size
* of this component
* @throws NullPointerException if {@code d} is {@code null}
* @see #setSize
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void setSize(Dimension d) {
resize(d);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setSize(Dimension)</code>.
*/
@Deprecated
public void resize(Dimension d) {
setSize(d.width, d.height);
}
/**
* Gets the bounds of this component in the form of a
* <code>Rectangle</code> object. The bounds specify this
* component's width, height, and location relative to
* its parent.
* @return a rectangle indicating this component's bounds
* @see #setBounds
* @see #getLocation
* @see #getSize
*/
public Rectangle getBounds() {
return bounds();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getBounds()</code>.
*/
@Deprecated
public Rectangle bounds() {
return new Rectangle(x, y, width, height);
}
/**
* Moves and resizes this component. The new location of the top-left
* corner is specified by <code>x</code> and <code>y</code>, and the
* new size is specified by <code>width</code> and <code>height</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param x the new <i>x</i>-coordinate of this component
* @param y the new <i>y</i>-coordinate of this component
* @param width the new <code>width</code> of this component
* @param height the new <code>height</code> of this
* component
* @see #getBounds
* @see #setLocation(int, int)
* @see #setLocation(Point)
* @see #setSize(int, int)
* @see #setSize(Dimension)
* @see #invalidate
* @since JDK1.1
*/
public void setBounds(int x, int y, int width, int height) {
reshape(x, y, width, height);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setBounds(int, int, int, int)</code>.
*/
@Deprecated
public void reshape(int x, int y, int width, int height) {
synchronized (getTreeLock()) {
try {
setBoundsOp(ComponentPeer.SET_BOUNDS);
boolean resized = (this.width != width) || (this.height != height);
boolean moved = (this.x != x) || (this.y != y);
if (!resized && !moved) {
return;
}
int oldX = this.x;
int oldY = this.y;
int oldWidth = this.width;
int oldHeight = this.height;
this.x = x;
this.y = y;
this.width = width;
this.height = height;
if (resized) {
isPacked = false;
}
boolean needNotify = true;
mixOnReshaping();
if (peer != null) {
// LightwightPeer is an empty stub so can skip peer.reshape
if (!(peer instanceof LightweightPeer)) {
reshapeNativePeer(x, y, width, height, getBoundsOp());
// Check peer actualy changed coordinates
resized = (oldWidth != this.width) || (oldHeight != this.height);
moved = (oldX != this.x) || (oldY != this.y);
// fix for 5025858: do not send ComponentEvents for toplevel
// windows here as it is done from peer or native code when
// the window is really resized or moved, otherwise some
// events may be sent twice
if (this instanceof Window) {
needNotify = false;
}
}
if (resized) {
invalidate();
}
if (parent != null) {
parent.invalidateIfValid();
}
}
if (needNotify) {
notifyNewBounds(resized, moved);
}
repaintParentIfNeeded(oldX, oldY, oldWidth, oldHeight);
} finally {
setBoundsOp(ComponentPeer.RESET_OPERATION);
}
}
}
private void repaintParentIfNeeded(int oldX, int oldY, int oldWidth,
int oldHeight)
{
if (parent != null && peer instanceof LightweightPeer && isShowing()) {
// Have the parent redraw the area this component occupied.
parent.repaint(oldX, oldY, oldWidth, oldHeight);
// Have the parent redraw the area this component *now* occupies.
repaint();
}
}
private void reshapeNativePeer(int x, int y, int width, int height, int op) {
// native peer might be offset by more than direct
// parent since parent might be lightweight.
int nativeX = x;
int nativeY = y;
for (Component c = parent;
(c != null) && (c.peer instanceof LightweightPeer);
c = c.parent)
{
nativeX += c.x;
nativeY += c.y;
}
peer.setBounds(nativeX, nativeY, width, height, op);
}
@SuppressWarnings("deprecation")
private void notifyNewBounds(boolean resized, boolean moved) {
if (componentListener != null
|| (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0
|| Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK))
{
if (resized) {
ComponentEvent e = new ComponentEvent(this,
ComponentEvent.COMPONENT_RESIZED);
Toolkit.getEventQueue().postEvent(e);
}
if (moved) {
ComponentEvent e = new ComponentEvent(this,
ComponentEvent.COMPONENT_MOVED);
Toolkit.getEventQueue().postEvent(e);
}
} else {
if (this instanceof Container && ((Container)this).countComponents() > 0) {
boolean enabledOnToolkit =
Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK);
if (resized) {
((Container)this).createChildHierarchyEvents(
HierarchyEvent.ANCESTOR_RESIZED, 0, enabledOnToolkit);
}
if (moved) {
((Container)this).createChildHierarchyEvents(
HierarchyEvent.ANCESTOR_MOVED, 0, enabledOnToolkit);
}
}
}
}
/**
* Moves and resizes this component to conform to the new
* bounding rectangle <code>r</code>. This component's new
* position is specified by <code>r.x</code> and <code>r.y</code>,
* and its new size is specified by <code>r.width</code> and
* <code>r.height</code>
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param r the new bounding rectangle for this component
* @throws NullPointerException if {@code r} is {@code null}
* @see #getBounds
* @see #setLocation(int, int)
* @see #setLocation(Point)
* @see #setSize(int, int)
* @see #setSize(Dimension)
* @see #invalidate
* @since JDK1.1
*/
public void setBounds(Rectangle r) {
setBounds(r.x, r.y, r.width, r.height);
}
/**
* Returns the current x coordinate of the components origin.
* This method is preferable to writing
* <code>component.getBounds().x</code>,
* or <code>component.getLocation().x</code> because it doesn't
* cause any heap allocations.
*
* @return the current x coordinate of the components origin
* @since 1.2
*/
public int getX() {
return x;
}
/**
* Returns the current y coordinate of the components origin.
* This method is preferable to writing
* <code>component.getBounds().y</code>,
* or <code>component.getLocation().y</code> because it
* doesn't cause any heap allocations.
*
* @return the current y coordinate of the components origin
* @since 1.2
*/
public int getY() {
return y;
}
/**
* Returns the current width of this component.
* This method is preferable to writing
* <code>component.getBounds().width</code>,
* or <code>component.getSize().width</code> because it
* doesn't cause any heap allocations.
*
* @return the current width of this component
* @since 1.2
*/
public int getWidth() {
return width;
}
/**
* Returns the current height of this component.
* This method is preferable to writing
* <code>component.getBounds().height</code>,
* or <code>component.getSize().height</code> because it
* doesn't cause any heap allocations.
*
* @return the current height of this component
* @since 1.2
*/
public int getHeight() {
return height;
}
/**
* Stores the bounds of this component into "return value" <b>rv</b> and
* return <b>rv</b>. If rv is <code>null</code> a new
* <code>Rectangle</code> is allocated.
* This version of <code>getBounds</code> is useful if the caller
* wants to avoid allocating a new <code>Rectangle</code> object
* on the heap.
*
* @param rv the return value, modified to the components bounds
* @return rv
*/
public Rectangle getBounds(Rectangle rv) {
if (rv == null) {
return new Rectangle(getX(), getY(), getWidth(), getHeight());
}
else {
rv.setBounds(getX(), getY(), getWidth(), getHeight());
return rv;
}
}
/**
* Stores the width/height of this component into "return value" <b>rv</b>
* and return <b>rv</b>. If rv is <code>null</code> a new
* <code>Dimension</code> object is allocated. This version of
* <code>getSize</code> is useful if the caller wants to avoid
* allocating a new <code>Dimension</code> object on the heap.
*
* @param rv the return value, modified to the components size
* @return rv
*/
public Dimension getSize(Dimension rv) {
if (rv == null) {
return new Dimension(getWidth(), getHeight());
}
else {
rv.setSize(getWidth(), getHeight());
return rv;
}
}
/**
* Stores the x,y origin of this component into "return value" <b>rv</b>
* and return <b>rv</b>. If rv is <code>null</code> a new
* <code>Point</code> is allocated.
* This version of <code>getLocation</code> is useful if the
* caller wants to avoid allocating a new <code>Point</code>
* object on the heap.
*
* @param rv the return value, modified to the components location
* @return rv
*/
public Point getLocation(Point rv) {
if (rv == null) {
return new Point(getX(), getY());
}
else {
rv.setLocation(getX(), getY());
return rv;
}
}
/**
* Returns true if this component is completely opaque, returns
* false by default.
* <p>
* An opaque component paints every pixel within its
* rectangular region. A non-opaque component paints only some of
* its pixels, allowing the pixels underneath it to "show through".
* A component that does not fully paint its pixels therefore
* provides a degree of transparency.
* <p>
* Subclasses that guarantee to always completely paint their
* contents should override this method and return true.
*
* @return true if this component is completely opaque
* @see #isLightweight
* @since 1.2
*/
public boolean isOpaque() {
if (getPeer() == null) {
return false;
}
else {
return !isLightweight();
}
}
/**
* A lightweight component doesn't have a native toolkit peer.
* Subclasses of <code>Component</code> and <code>Container</code>,
* other than the ones defined in this package like <code>Button</code>
* or <code>Scrollbar</code>, are lightweight.
* All of the Swing components are lightweights.
* <p>
* This method will always return <code>false</code> if this component
* is not displayable because it is impossible to determine the
* weight of an undisplayable component.
*
* @return true if this component has a lightweight peer; false if
* it has a native peer or no peer
* @see #isDisplayable
* @since 1.2
*/
public boolean isLightweight() {
return getPeer() instanceof LightweightPeer;
}
/**
* Sets the preferred size of this component to a constant
* value. Subsequent calls to <code>getPreferredSize</code> will always
* return this value. Setting the preferred size to <code>null</code>
* restores the default behavior.
*
* @param preferredSize The new preferred size, or null
* @see #getPreferredSize
* @see #isPreferredSizeSet
* @since 1.5
*/
public void setPreferredSize(Dimension preferredSize) {
Dimension old;
// If the preferred size was set, use it as the old value, otherwise
// use null to indicate we didn't previously have a set preferred
// size.
if (prefSizeSet) {
old = this.prefSize;
}
else {
old = null;
}
this.prefSize = preferredSize;
prefSizeSet = (preferredSize != null);
firePropertyChange("preferredSize", old, preferredSize);
}
/**
* Returns true if the preferred size has been set to a
* non-<code>null</code> value otherwise returns false.
*
* @return true if <code>setPreferredSize</code> has been invoked
* with a non-null value.
* @since 1.5
*/
public boolean isPreferredSizeSet() {
return prefSizeSet;
}
/**
* Gets the preferred size of this component.
* @return a dimension object indicating this component's preferred size
* @see #getMinimumSize
* @see LayoutManager
*/
public Dimension getPreferredSize() {
return preferredSize();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getPreferredSize()</code>.
*/
@Deprecated
public Dimension preferredSize() {
/* Avoid grabbing the lock if a reasonable cached size value
* is available.
*/
Dimension dim = prefSize;
if (dim == null || !(isPreferredSizeSet() || isValid())) {
synchronized (getTreeLock()) {
prefSize = (peer != null) ?
peer.getPreferredSize() :
getMinimumSize();
dim = prefSize;
}
}
return new Dimension(dim);
}
/**
* Sets the minimum size of this component to a constant
* value. Subsequent calls to <code>getMinimumSize</code> will always
* return this value. Setting the minimum size to <code>null</code>
* restores the default behavior.
*
* @param minimumSize the new minimum size of this component
* @see #getMinimumSize
* @see #isMinimumSizeSet
* @since 1.5
*/
public void setMinimumSize(Dimension minimumSize) {
Dimension old;
// If the minimum size was set, use it as the old value, otherwise
// use null to indicate we didn't previously have a set minimum
// size.
if (minSizeSet) {
old = this.minSize;
}
else {
old = null;
}
this.minSize = minimumSize;
minSizeSet = (minimumSize != null);
firePropertyChange("minimumSize", old, minimumSize);
}
/**
* Returns whether or not <code>setMinimumSize</code> has been
* invoked with a non-null value.
*
* @return true if <code>setMinimumSize</code> has been invoked with a
* non-null value.
* @since 1.5
*/
public boolean isMinimumSizeSet() {
return minSizeSet;
}
/**
* Gets the minimum size of this component.
* @return a dimension object indicating this component's minimum size
* @see #getPreferredSize
* @see LayoutManager
*/
public Dimension getMinimumSize() {
return minimumSize();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getMinimumSize()</code>.
*/
@Deprecated
public Dimension minimumSize() {
/* Avoid grabbing the lock if a reasonable cached size value
* is available.
*/
Dimension dim = minSize;
if (dim == null || !(isMinimumSizeSet() || isValid())) {
synchronized (getTreeLock()) {
minSize = (peer != null) ?
peer.getMinimumSize() :
size();
dim = minSize;
}
}
return new Dimension(dim);
}
/**
* Sets the maximum size of this component to a constant
* value. Subsequent calls to <code>getMaximumSize</code> will always
* return this value. Setting the maximum size to <code>null</code>
* restores the default behavior.
*
* @param maximumSize a <code>Dimension</code> containing the
* desired maximum allowable size
* @see #getMaximumSize
* @see #isMaximumSizeSet
* @since 1.5
*/
public void setMaximumSize(Dimension maximumSize) {
// If the maximum size was set, use it as the old value, otherwise
// use null to indicate we didn't previously have a set maximum
// size.
Dimension old;
if (maxSizeSet) {
old = this.maxSize;
}
else {
old = null;
}
this.maxSize = maximumSize;
maxSizeSet = (maximumSize != null);
firePropertyChange("maximumSize", old, maximumSize);
}
/**
* Returns true if the maximum size has been set to a non-<code>null</code>
* value otherwise returns false.
*
* @return true if <code>maximumSize</code> is non-<code>null</code>,
* false otherwise
* @since 1.5
*/
public boolean isMaximumSizeSet() {
return maxSizeSet;
}
/**
* Gets the maximum size of this component.
* @return a dimension object indicating this component's maximum size
* @see #getMinimumSize
* @see #getPreferredSize
* @see LayoutManager
*/
public Dimension getMaximumSize() {
if (isMaximumSizeSet()) {
return new Dimension(maxSize);
}
return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
}
/**
* Returns the alignment along the x axis. This specifies how
* the component would like to be aligned relative to other
* components. The value should be a number between 0 and 1
* where 0 represents alignment along the origin, 1 is aligned
* the furthest away from the origin, 0.5 is centered, etc.
*/
public float getAlignmentX() {
return CENTER_ALIGNMENT;
}
/**
* Returns the alignment along the y axis. This specifies how
* the component would like to be aligned relative to other
* components. The value should be a number between 0 and 1
* where 0 represents alignment along the origin, 1 is aligned
* the furthest away from the origin, 0.5 is centered, etc.
*/
public float getAlignmentY() {
return CENTER_ALIGNMENT;
}
/**
* Returns the baseline. The baseline is measured from the top of
* the component. This method is primarily meant for
* <code>LayoutManager</code>s to align components along their
* baseline. A return value less than 0 indicates this component
* does not have a reasonable baseline and that
* <code>LayoutManager</code>s should not align this component on
* its baseline.
* <p>
* The default implementation returns -1. Subclasses that support
* baseline should override appropriately. If a value >= 0 is
* returned, then the component has a valid baseline for any
* size >= the minimum size and <code>getBaselineResizeBehavior</code>
* can be used to determine how the baseline changes with size.
*
* @param width the width to get the baseline for
* @param height the height to get the baseline for
* @return the baseline or < 0 indicating there is no reasonable
* baseline
* @throws IllegalArgumentException if width or height is < 0
* @see #getBaselineResizeBehavior
* @see java.awt.FontMetrics
* @since 1.6
*/
public int getBaseline(int width, int height) {
if (width < 0 || height < 0) {
throw new IllegalArgumentException(
"Width and height must be >= 0");
}
return -1;
}
/**
* Returns an enum indicating how the baseline of the component
* changes as the size changes. This method is primarily meant for
* layout managers and GUI builders.
* <p>
* The default implementation returns
* <code>BaselineResizeBehavior.OTHER</code>. Subclasses that have a
* baseline should override appropriately. Subclasses should
* never return <code>null</code>; if the baseline can not be
* calculated return <code>BaselineResizeBehavior.OTHER</code>. Callers
* should first ask for the baseline using
* <code>getBaseline</code> and if a value >= 0 is returned use
* this method. It is acceptable for this method to return a
* value other than <code>BaselineResizeBehavior.OTHER</code> even if
* <code>getBaseline</code> returns a value less than 0.
*
* @return an enum indicating how the baseline changes as the component
* size changes
* @see #getBaseline(int, int)
* @since 1.6
*/
public BaselineResizeBehavior getBaselineResizeBehavior() {
return BaselineResizeBehavior.OTHER;
}
/**
* Prompts the layout manager to lay out this component. This is
* usually called when the component (more specifically, container)
* is validated.
* @see #validate
* @see LayoutManager
*/
public void doLayout() {
layout();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>doLayout()</code>.
*/
@Deprecated
public void layout() {
}
/**
* Validates this component.
* <p>
* The meaning of the term <i>validating</i> is defined by the ancestors of
* this class. See {@link Container#validate} for more details.
*
* @see #invalidate
* @see #doLayout()
* @see LayoutManager
* @see Container#validate
* @since JDK1.0
*/
public void validate() {
synchronized (getTreeLock()) {
ComponentPeer peer = this.peer;
boolean wasValid = isValid();
if (!wasValid && peer != null) {
Font newfont = getFont();
Font oldfont = peerFont;
if (newfont != oldfont && (oldfont == null
|| !oldfont.equals(newfont))) {
peer.setFont(newfont);
peerFont = newfont;
}
peer.layout();
}
valid = true;
if (!wasValid) {
mixOnValidating();
}
}
}
/**
* Invalidates this component and its ancestors.
* <p>
* By default, all the ancestors of the component up to the top-most
* container of the hierarchy are marked invalid. If the {@code
* java.awt.smartInvalidate} system property is set to {@code true},
* invalidation stops on the nearest validate root of this component.
* Marking a container <i>invalid</i> indicates that the container needs to
* be laid out.
* <p>
* This method is called automatically when any layout-related information
* changes (e.g. setting the bounds of the component, or adding the
* component to a container).
* <p>
* This method might be called often, so it should work fast.
*
* @see #validate
* @see #doLayout
* @see LayoutManager
* @see java.awt.Container#isValidateRoot
* @since JDK1.0
*/
public void invalidate() {
synchronized (getTreeLock()) {
/* Nullify cached layout and size information.
* For efficiency, propagate invalidate() upwards only if
* some other component hasn't already done so first.
*/
valid = false;
if (!isPreferredSizeSet()) {
prefSize = null;
}
if (!isMinimumSizeSet()) {
minSize = null;
}
if (!isMaximumSizeSet()) {
maxSize = null;
}
invalidateParent();
}
}
/**
* Invalidates the parent of this component if any.
*
* This method MUST BE invoked under the TreeLock.
*/
void invalidateParent() {
if (parent != null) {
parent.invalidateIfValid();
}
}
/** Invalidates the component unless it is already invalid.
*/
final void invalidateIfValid() {
if (isValid()) {
invalidate();
}
}
/**
* Revalidates the component hierarchy up to the nearest validate root.
* <p>
* This method first invalidates the component hierarchy starting from this
* component up to the nearest validate root. Afterwards, the component
* hierarchy is validated starting from the nearest validate root.
* <p>
* This is a convenience method supposed to help application developers
* avoid looking for validate roots manually. Basically, it's equivalent to
* first calling the {@link #invalidate()} method on this component, and
* then calling the {@link #validate()} method on the nearest validate
* root.
*
* @see Container#isValidateRoot
* @since 1.7
*/
public void revalidate() {
revalidateSynchronously();
}
/**
* Revalidates the component synchronously.
*/
final void revalidateSynchronously() {
synchronized (getTreeLock()) {
invalidate();
Container root = getContainer();
if (root == null) {
// There's no parents. Just validate itself.
validate();
} else {
while (!root.isValidateRoot()) {
if (root.getContainer() == null) {
// If there's no validate roots, we'll validate the
// topmost container
break;
}
root = root.getContainer();
}
root.validate();
}
}
}
/**
* Creates a graphics context for this component. This method will
* return <code>null</code> if this component is currently not
* displayable.
* @return a graphics context for this component, or <code>null</code>
* if it has none
* @see #paint
* @since JDK1.0
*/
public Graphics getGraphics() {
if (peer instanceof LightweightPeer) {
// This is for a lightweight component, need to
// translate coordinate spaces and clip relative
// to the parent.
if (parent == null) return null;
Graphics g = parent.getGraphics();
if (g == null) return null;
if (g instanceof ConstrainableGraphics) {
((ConstrainableGraphics) g).constrain(x, y, width, height);
} else {
g.translate(x,y);
g.setClip(0, 0, width, height);
}
g.setFont(getFont());
return g;
} else {
ComponentPeer peer = this.peer;
return (peer != null) ? peer.getGraphics() : null;
}
}
final Graphics getGraphics_NoClientCode() {
ComponentPeer peer = this.peer;
if (peer instanceof LightweightPeer) {
// This is for a lightweight component, need to
// translate coordinate spaces and clip relative
// to the parent.
Container parent = this.parent;
if (parent == null) return null;
Graphics g = parent.getGraphics_NoClientCode();
if (g == null) return null;
if (g instanceof ConstrainableGraphics) {
((ConstrainableGraphics) g).constrain(x, y, width, height);
} else {
g.translate(x,y);
g.setClip(0, 0, width, height);
}
g.setFont(getFont_NoClientCode());
return g;
} else {
return (peer != null) ? peer.getGraphics() : null;
}
}
/**
* Gets the font metrics for the specified font.
* Warning: Since Font metrics are affected by the
* {@link java.awt.font.FontRenderContext FontRenderContext} and
* this method does not provide one, it can return only metrics for
* the default render context which may not match that used when
* rendering on the Component if {@link Graphics2D} functionality is being
* used. Instead metrics can be obtained at rendering time by calling
* {@link Graphics#getFontMetrics()} or text measurement APIs on the
* {@link Font Font} class.
* @param font the font for which font metrics is to be
* obtained
* @return the font metrics for <code>font</code>
* @see #getFont
* @see #getPeer
* @see java.awt.peer.ComponentPeer#getFontMetrics(Font)
* @see Toolkit#getFontMetrics(Font)
* @since JDK1.0
*/
public FontMetrics getFontMetrics(Font font) {
// This is an unsupported hack, but left in for a customer.
// Do not remove.
FontManager fm = FontManagerFactory.getInstance();
if (fm instanceof SunFontManager
&& ((SunFontManager) fm).usePlatformFontMetrics()) {
if (peer != null &&
!(peer instanceof LightweightPeer)) {
return peer.getFontMetrics(font);
}
}
return sun.font.FontDesignMetrics.getMetrics(font);
}
/**
* Sets the cursor image to the specified cursor. This cursor
* image is displayed when the <code>contains</code> method for
* this component returns true for the current cursor location, and
* this Component is visible, displayable, and enabled. Setting the
* cursor of a <code>Container</code> causes that cursor to be displayed
* within all of the container's subcomponents, except for those
* that have a non-<code>null</code> cursor.
* <p>
* The method may have no visual effect if the Java platform
* implementation and/or the native system do not support
* changing the mouse cursor shape.
* @param cursor One of the constants defined
* by the <code>Cursor</code> class;
* if this parameter is <code>null</code>
* then this component will inherit
* the cursor of its parent
* @see #isEnabled
* @see #isShowing
* @see #getCursor
* @see #contains
* @see Toolkit#createCustomCursor
* @see Cursor
* @since JDK1.1
*/
public void setCursor(Cursor cursor) {
this.cursor = cursor;
updateCursorImmediately();
}
/**
* Updates the cursor. May not be invoked from the native
* message pump.
*/
final void updateCursorImmediately() {
if (peer instanceof LightweightPeer) {
Container nativeContainer = getNativeContainer();
if (nativeContainer == null) return;
ComponentPeer cPeer = nativeContainer.getPeer();
if (cPeer != null) {
cPeer.updateCursorImmediately();
}
} else if (peer != null) {
peer.updateCursorImmediately();
}
}
/**
* Gets the cursor set in the component. If the component does
* not have a cursor set, the cursor of its parent is returned.
* If no cursor is set in the entire hierarchy,
* <code>Cursor.DEFAULT_CURSOR</code> is returned.
* @see #setCursor
* @since JDK1.1
*/
public Cursor getCursor() {
return getCursor_NoClientCode();
}
final Cursor getCursor_NoClientCode() {
Cursor cursor = this.cursor;
if (cursor != null) {
return cursor;
}
Container parent = this.parent;
if (parent != null) {
return parent.getCursor_NoClientCode();
} else {
return Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
}
}
/**
* Returns whether the cursor has been explicitly set for this Component.
* If this method returns <code>false</code>, this Component is inheriting
* its cursor from an ancestor.
*
* @return <code>true</code> if the cursor has been explicitly set for this
* Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean isCursorSet() {
return (cursor != null);
}
/**
* Paints this component.
* <p>
* This method is called when the contents of the component should
* be painted; such as when the component is first being shown or
* is damaged and in need of repair. The clip rectangle in the
* <code>Graphics</code> parameter is set to the area
* which needs to be painted.
* Subclasses of <code>Component</code> that override this
* method need not call <code>super.paint(g)</code>.
* <p>
* For performance reasons, <code>Component</code>s with zero width
* or height aren't considered to need painting when they are first shown,
* and also aren't considered to need repair.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param g the graphics context to use for painting
* @see #update
* @since JDK1.0
*/
public void paint(Graphics g) {
}
/**
* Updates this component.
* <p>
* If this component is not a lightweight component, the
* AWT calls the <code>update</code> method in response to
* a call to <code>repaint</code>. You can assume that
* the background is not cleared.
* <p>
* The <code>update</code> method of <code>Component</code>
* calls this component's <code>paint</code> method to redraw
* this component. This method is commonly overridden by subclasses
* which need to do additional work in response to a call to
* <code>repaint</code>.
* Subclasses of Component that override this method should either
* call <code>super.update(g)</code>, or call <code>paint(g)</code>
* directly from their <code>update</code> method.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
*
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param g the specified context to use for updating
* @see #paint
* @see #repaint()
* @since JDK1.0
*/
public void update(Graphics g) {
paint(g);
}
/**
* Paints this component and all of its subcomponents.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
*
* @param g the graphics context to use for painting
* @see #paint
* @since JDK1.0
*/
public void paintAll(Graphics g) {
if (isShowing()) {
GraphicsCallback.PeerPaintCallback.getInstance().
runOneComponent(this, new Rectangle(0, 0, width, height),
g, g.getClip(),
GraphicsCallback.LIGHTWEIGHTS |
GraphicsCallback.HEAVYWEIGHTS);
}
}
/**
* Simulates the peer callbacks into java.awt for painting of
* lightweight Components.
* @param g the graphics context to use for painting
* @see #paintAll
*/
void lightweightPaint(Graphics g) {
paint(g);
}
/**
* Paints all the heavyweight subcomponents.
*/
void paintHeavyweightComponents(Graphics g) {
}
/**
* Repaints this component.
* <p>
* If this component is a lightweight component, this method
* causes a call to this component's <code>paint</code>
* method as soon as possible. Otherwise, this method causes
* a call to this component's <code>update</code> method as soon
* as possible.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @see #update(Graphics)
* @since JDK1.0
*/
public void repaint() {
repaint(0, 0, 0, width, height);
}
/**
* Repaints the component. If this component is a lightweight
* component, this results in a call to <code>paint</code>
* within <code>tm</code> milliseconds.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param tm maximum time in milliseconds before update
* @see #paint
* @see #update(Graphics)
* @since JDK1.0
*/
public void repaint(long tm) {
repaint(tm, 0, 0, width, height);
}
/**
* Repaints the specified rectangle of this component.
* <p>
* If this component is a lightweight component, this method
* causes a call to this component's <code>paint</code> method
* as soon as possible. Otherwise, this method causes a call to
* this component's <code>update</code> method as soon as possible.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @param width the width
* @param height the height
* @see #update(Graphics)
* @since JDK1.0
*/
public void repaint(int x, int y, int width, int height) {
repaint(0, x, y, width, height);
}
/**
* Repaints the specified rectangle of this component within
* <code>tm</code> milliseconds.
* <p>
* If this component is a lightweight component, this method causes
* a call to this component's <code>paint</code> method.
* Otherwise, this method causes a call to this component's
* <code>update</code> method.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param tm maximum time in milliseconds before update
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @param width the width
* @param height the height
* @see #update(Graphics)
* @since JDK1.0
*/
public void repaint(long tm, int x, int y, int width, int height) {
if (this.peer instanceof LightweightPeer) {
// Needs to be translated to parent coordinates since
// a parent native container provides the actual repaint
// services. Additionally, the request is restricted to
// the bounds of the component.
if (parent != null) {
if (x < 0) {
width += x;
x = 0;
}
if (y < 0) {
height += y;
y = 0;
}
int pwidth = (width > this.width) ? this.width : width;
int pheight = (height > this.height) ? this.height : height;
if (pwidth <= 0 || pheight <= 0) {
return;
}
int px = this.x + x;
int py = this.y + y;
parent.repaint(tm, px, py, pwidth, pheight);
}
} else {
if (isVisible() && (this.peer != null) &&
(width > 0) && (height > 0)) {
PaintEvent e = new PaintEvent(this, PaintEvent.UPDATE,
new Rectangle(x, y, width, height));
SunToolkit.postEvent(SunToolkit.targetToAppContext(this), e);
}
}
}
/**
* Prints this component. Applications should override this method
* for components that must do special processing before being
* printed or should be printed differently than they are painted.
* <p>
* The default implementation of this method calls the
* <code>paint</code> method.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
* @param g the graphics context to use for printing
* @see #paint(Graphics)
* @since JDK1.0
*/
public void print(Graphics g) {
paint(g);
}
/**
* Prints this component and all of its subcomponents.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
* @param g the graphics context to use for printing
* @see #print(Graphics)
* @since JDK1.0
*/
public void printAll(Graphics g) {
if (isShowing()) {
GraphicsCallback.PeerPrintCallback.getInstance().
runOneComponent(this, new Rectangle(0, 0, width, height),
g, g.getClip(),
GraphicsCallback.LIGHTWEIGHTS |
GraphicsCallback.HEAVYWEIGHTS);
}
}
/**
* Simulates the peer callbacks into java.awt for printing of
* lightweight Components.
* @param g the graphics context to use for printing
* @see #printAll
*/
void lightweightPrint(Graphics g) {
print(g);
}
/**
* Prints all the heavyweight subcomponents.
*/
void printHeavyweightComponents(Graphics g) {
}
private Insets getInsets_NoClientCode() {
ComponentPeer peer = this.peer;
if (peer instanceof ContainerPeer) {
return (Insets)((ContainerPeer)peer).getInsets().clone();
}
return new Insets(0, 0, 0, 0);
}
/**
* Repaints the component when the image has changed.
* This <code>imageUpdate</code> method of an <code>ImageObserver</code>
* is called when more information about an
* image which had been previously requested using an asynchronous
* routine such as the <code>drawImage</code> method of
* <code>Graphics</code> becomes available.
* See the definition of <code>imageUpdate</code> for
* more information on this method and its arguments.
* <p>
* The <code>imageUpdate</code> method of <code>Component</code>
* incrementally draws an image on the component as more of the bits
* of the image are available.
* <p>
* If the system property <code>awt.image.incrementaldraw</code>
* is missing or has the value <code>true</code>, the image is
* incrementally drawn. If the system property has any other value,
* then the image is not drawn until it has been completely loaded.
* <p>
* Also, if incremental drawing is in effect, the value of the
* system property <code>awt.image.redrawrate</code> is interpreted
* as an integer to give the maximum redraw rate, in milliseconds. If
* the system property is missing or cannot be interpreted as an
* integer, the redraw rate is once every 100ms.
* <p>
* The interpretation of the <code>x</code>, <code>y</code>,
* <code>width</code>, and <code>height</code> arguments depends on
* the value of the <code>infoflags</code> argument.
*
* @param img the image being observed
* @param infoflags see <code>imageUpdate</code> for more information
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @param w the width
* @param h the height
* @return <code>false</code> if the infoflags indicate that the
* image is completely loaded; <code>true</code> otherwise.
*
* @see java.awt.image.ImageObserver
* @see Graphics#drawImage(Image, int, int, Color, java.awt.image.ImageObserver)
* @see Graphics#drawImage(Image, int, int, java.awt.image.ImageObserver)
* @see Graphics#drawImage(Image, int, int, int, int, Color, java.awt.image.ImageObserver)
* @see Graphics#drawImage(Image, int, int, int, int, java.awt.image.ImageObserver)
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
* @since JDK1.0
*/
public boolean imageUpdate(Image img, int infoflags,
int x, int y, int w, int h) {
int rate = -1;
if ((infoflags & (FRAMEBITS|ALLBITS)) != 0) {
rate = 0;
} else if ((infoflags & SOMEBITS) != 0) {
if (isInc) {
rate = incRate;
if (rate < 0) {
rate = 0;
}
}
}
if (rate >= 0) {
repaint(rate, 0, 0, width, height);
}
return (infoflags & (ALLBITS|ABORT)) == 0;
}
/**
* Creates an image from the specified image producer.
* @param producer the image producer
* @return the image produced
* @since JDK1.0
*/
public Image createImage(ImageProducer producer) {
ComponentPeer peer = this.peer;
if ((peer != null) && ! (peer instanceof LightweightPeer)) {
return peer.createImage(producer);
}
return getToolkit().createImage(producer);
}
/**
* Creates an off-screen drawable image
* to be used for double buffering.
* @param width the specified width
* @param height the specified height
* @return an off-screen drawable image, which can be used for double
* buffering. The return value may be <code>null</code> if the
* component is not displayable. This will always happen if
* <code>GraphicsEnvironment.isHeadless()</code> returns
* <code>true</code>.
* @see #isDisplayable
* @see GraphicsEnvironment#isHeadless
* @since JDK1.0
*/
public Image createImage(int width, int height) {
ComponentPeer peer = this.peer;
if (peer instanceof LightweightPeer) {
if (parent != null) { return parent.createImage(width, height); }
else { return null;}
} else {
return (peer != null) ? peer.createImage(width, height) : null;
}
}
/**
* Creates a volatile off-screen drawable image
* to be used for double buffering.
* @param width the specified width.
* @param height the specified height.
* @return an off-screen drawable image, which can be used for double
* buffering. The return value may be <code>null</code> if the
* component is not displayable. This will always happen if
* <code>GraphicsEnvironment.isHeadless()</code> returns
* <code>true</code>.
* @see java.awt.image.VolatileImage
* @see #isDisplayable
* @see GraphicsEnvironment#isHeadless
* @since 1.4
*/
public VolatileImage createVolatileImage(int width, int height) {
ComponentPeer peer = this.peer;
if (peer instanceof LightweightPeer) {
if (parent != null) {
return parent.createVolatileImage(width, height);
}
else { return null;}
} else {
return (peer != null) ?
peer.createVolatileImage(width, height) : null;
}
}
/**
* Creates a volatile off-screen drawable image, with the given capabilities.
* The contents of this image may be lost at any time due
* to operating system issues, so the image must be managed
* via the <code>VolatileImage</code> interface.
* @param width the specified width.
* @param height the specified height.
* @param caps the image capabilities
* @exception AWTException if an image with the specified capabilities cannot
* be created
* @return a VolatileImage object, which can be used
* to manage surface contents loss and capabilities.
* @see java.awt.image.VolatileImage
* @since 1.4
*/
public VolatileImage createVolatileImage(int width, int height,
ImageCapabilities caps) throws AWTException {
// REMIND : check caps
return createVolatileImage(width, height);
}
/**
* Prepares an image for rendering on this component. The image
* data is downloaded asynchronously in another thread and the
* appropriate screen representation of the image is generated.
* @param image the <code>Image</code> for which to
* prepare a screen representation
* @param observer the <code>ImageObserver</code> object
* to be notified as the image is being prepared
* @return <code>true</code> if the image has already been fully
* prepared; <code>false</code> otherwise
* @since JDK1.0
*/
public boolean prepareImage(Image image, ImageObserver observer) {
return prepareImage(image, -1, -1, observer);
}
/**
* Prepares an image for rendering on this component at the
* specified width and height.
* <p>
* The image data is downloaded asynchronously in another thread,
* and an appropriately scaled screen representation of the image is
* generated.
* @param image the instance of <code>Image</code>
* for which to prepare a screen representation
* @param width the width of the desired screen representation
* @param height the height of the desired screen representation
* @param observer the <code>ImageObserver</code> object
* to be notified as the image is being prepared
* @return <code>true</code> if the image has already been fully
* prepared; <code>false</code> otherwise
* @see java.awt.image.ImageObserver
* @since JDK1.0
*/
public boolean prepareImage(Image image, int width, int height,
ImageObserver observer) {
ComponentPeer peer = this.peer;
if (peer instanceof LightweightPeer) {
return (parent != null)
? parent.prepareImage(image, width, height, observer)
: getToolkit().prepareImage(image, width, height, observer);
} else {
return (peer != null)
? peer.prepareImage(image, width, height, observer)
: getToolkit().prepareImage(image, width, height, observer);
}
}
/**
* Returns the status of the construction of a screen representation
* of the specified image.
* <p>
* This method does not cause the image to begin loading. An
* application must use the <code>prepareImage</code> method
* to force the loading of an image.
* <p>
* Information on the flags returned by this method can be found
* with the discussion of the <code>ImageObserver</code> interface.
* @param image the <code>Image</code> object whose status
* is being checked
* @param observer the <code>ImageObserver</code>
* object to be notified as the image is being prepared
* @return the bitwise inclusive <b>OR</b> of
* <code>ImageObserver</code> flags indicating what
* information about the image is currently available
* @see #prepareImage(Image, int, int, java.awt.image.ImageObserver)
* @see Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
* @see java.awt.image.ImageObserver
* @since JDK1.0
*/
public int checkImage(Image image, ImageObserver observer) {
return checkImage(image, -1, -1, observer);
}
/**
* Returns the status of the construction of a screen representation
* of the specified image.
* <p>
* This method does not cause the image to begin loading. An
* application must use the <code>prepareImage</code> method
* to force the loading of an image.
* <p>
* The <code>checkImage</code> method of <code>Component</code>
* calls its peer's <code>checkImage</code> method to calculate
* the flags. If this component does not yet have a peer, the
* component's toolkit's <code>checkImage</code> method is called
* instead.
* <p>
* Information on the flags returned by this method can be found
* with the discussion of the <code>ImageObserver</code> interface.
* @param image the <code>Image</code> object whose status
* is being checked
* @param width the width of the scaled version
* whose status is to be checked
* @param height the height of the scaled version
* whose status is to be checked
* @param observer the <code>ImageObserver</code> object
* to be notified as the image is being prepared
* @return the bitwise inclusive <b>OR</b> of
* <code>ImageObserver</code> flags indicating what
* information about the image is currently available
* @see #prepareImage(Image, int, int, java.awt.image.ImageObserver)
* @see Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
* @see java.awt.image.ImageObserver
* @since JDK1.0
*/
public int checkImage(Image image, int width, int height,
ImageObserver observer) {
ComponentPeer peer = this.peer;
if (peer instanceof LightweightPeer) {
return (parent != null)
? parent.checkImage(image, width, height, observer)
: getToolkit().checkImage(image, width, height, observer);
} else {
return (peer != null)
? peer.checkImage(image, width, height, observer)
: getToolkit().checkImage(image, width, height, observer);
}
}
/**
* Creates a new strategy for multi-buffering on this component.
* Multi-buffering is useful for rendering performance. This method
* attempts to create the best strategy available with the number of
* buffers supplied. It will always create a <code>BufferStrategy</code>
* with that number of buffers.
* A page-flipping strategy is attempted first, then a blitting strategy
* using accelerated buffers. Finally, an unaccelerated blitting
* strategy is used.
* <p>
* Each time this method is called,
* the existing buffer strategy for this component is discarded.
* @param numBuffers number of buffers to create, including the front buffer
* @exception IllegalArgumentException if numBuffers is less than 1.
* @exception IllegalStateException if the component is not displayable
* @see #isDisplayable
* @see Window#getBufferStrategy()
* @see Canvas#getBufferStrategy()
* @since 1.4
*/
void createBufferStrategy(int numBuffers) {
BufferCapabilities bufferCaps;
if (numBuffers > 1) {
// Try to create a page-flipping strategy
bufferCaps = new BufferCapabilities(new ImageCapabilities(true),
new ImageCapabilities(true),
BufferCapabilities.FlipContents.UNDEFINED);
try {
createBufferStrategy(numBuffers, bufferCaps);
return; // Success
} catch (AWTException e) {
// Failed
}
}
// Try a blitting (but still accelerated) strategy
bufferCaps = new BufferCapabilities(new ImageCapabilities(true),
new ImageCapabilities(true),
null);
try {
createBufferStrategy(numBuffers, bufferCaps);
return; // Success
} catch (AWTException e) {
// Failed
}
// Try an unaccelerated blitting strategy
bufferCaps = new BufferCapabilities(new ImageCapabilities(false),
new ImageCapabilities(false),
null);
try {
createBufferStrategy(numBuffers, bufferCaps);
return; // Success
} catch (AWTException e) {
// Code should never reach here (an unaccelerated blitting
// strategy should always work)
throw new InternalError("Could not create a buffer strategy", e);
}
}
/**
* Creates a new strategy for multi-buffering on this component with the
* required buffer capabilities. This is useful, for example, if only
* accelerated memory or page flipping is desired (as specified by the
* buffer capabilities).
* <p>
* Each time this method
* is called, <code>dispose</code> will be invoked on the existing
* <code>BufferStrategy</code>.
* @param numBuffers number of buffers to create
* @param caps the required capabilities for creating the buffer strategy;
* cannot be <code>null</code>
* @exception AWTException if the capabilities supplied could not be
* supported or met; this may happen, for example, if there is not enough
* accelerated memory currently available, or if page flipping is specified
* but not possible.
* @exception IllegalArgumentException if numBuffers is less than 1, or if
* caps is <code>null</code>
* @see Window#getBufferStrategy()
* @see Canvas#getBufferStrategy()
* @since 1.4
*/
void createBufferStrategy(int numBuffers,
BufferCapabilities caps) throws AWTException {
// Check arguments
if (numBuffers < 1) {
throw new IllegalArgumentException(
"Number of buffers must be at least 1");
}
if (caps == null) {
throw new IllegalArgumentException("No capabilities specified");
}
// Destroy old buffers
if (bufferStrategy != null) {
bufferStrategy.dispose();
}
if (numBuffers == 1) {
bufferStrategy = new SingleBufferStrategy(caps);
} else {
SunGraphicsEnvironment sge = (SunGraphicsEnvironment)
GraphicsEnvironment.getLocalGraphicsEnvironment();
if (!caps.isPageFlipping() && sge.isFlipStrategyPreferred(peer)) {
caps = new ProxyCapabilities(caps);
}
// assert numBuffers > 1;
if (caps.isPageFlipping()) {
bufferStrategy = new FlipSubRegionBufferStrategy(numBuffers, caps);
} else {
bufferStrategy = new BltSubRegionBufferStrategy(numBuffers, caps);
}
}
}
/**
* This is a proxy capabilities class used when a FlipBufferStrategy
* is created instead of the requested Blit strategy.
*
* @see sun.java2d.SunGraphicsEnvironment#isFlipStrategyPreferred(ComponentPeer)
*/
private class ProxyCapabilities extends ExtendedBufferCapabilities {
private BufferCapabilities orig;
private ProxyCapabilities(BufferCapabilities orig) {
super(orig.getFrontBufferCapabilities(),
orig.getBackBufferCapabilities(),
orig.getFlipContents() ==
BufferCapabilities.FlipContents.BACKGROUND ?
BufferCapabilities.FlipContents.BACKGROUND :
BufferCapabilities.FlipContents.COPIED);
this.orig = orig;
}
}
/**
* @return the buffer strategy used by this component
* @see Window#createBufferStrategy
* @see Canvas#createBufferStrategy
* @since 1.4
*/
BufferStrategy getBufferStrategy() {
return bufferStrategy;
}
/**
* @return the back buffer currently used by this component's
* BufferStrategy. If there is no BufferStrategy or no
* back buffer, this method returns null.
*/
Image getBackBuffer() {
if (bufferStrategy != null) {
if (bufferStrategy instanceof BltBufferStrategy) {
BltBufferStrategy bltBS = (BltBufferStrategy)bufferStrategy;
return bltBS.getBackBuffer();
} else if (bufferStrategy instanceof FlipBufferStrategy) {
FlipBufferStrategy flipBS = (FlipBufferStrategy)bufferStrategy;
return flipBS.getBackBuffer();
}
}
return null;
}
/**
* Inner class for flipping buffers on a component. That component must
* be a <code>Canvas</code> or <code>Window</code>.
* @see Canvas
* @see Window
* @see java.awt.image.BufferStrategy
* @author Michael Martak
* @since 1.4
*/
protected class FlipBufferStrategy extends BufferStrategy {
/**
* The number of buffers
*/
protected int numBuffers; // = 0
/**
* The buffering capabilities
*/
protected BufferCapabilities caps; // = null
/**
* The drawing buffer
*/
protected Image drawBuffer; // = null
/**
* The drawing buffer as a volatile image
*/
protected VolatileImage drawVBuffer; // = null
/**
* Whether or not the drawing buffer has been recently restored from
* a lost state.
*/
protected boolean validatedContents; // = false
/**
* Size of the back buffers. (Note: these fields were added in 6.0
* but kept package-private to avoid exposing them in the spec.
* None of these fields/methods really should have been marked
* protected when they were introduced in 1.4, but now we just have
* to live with that decision.)
*/
int width;
int height;
/**
* Creates a new flipping buffer strategy for this component.
* The component must be a <code>Canvas</code> or <code>Window</code>.
* @see Canvas
* @see Window
* @param numBuffers the number of buffers
* @param caps the capabilities of the buffers
* @exception AWTException if the capabilities supplied could not be
* supported or met
* @exception ClassCastException if the component is not a canvas or
* window.
* @exception IllegalStateException if the component has no peer
* @exception IllegalArgumentException if {@code numBuffers} is less than two,
* or if {@code BufferCapabilities.isPageFlipping} is not
* {@code true}.
* @see #createBuffers(int, BufferCapabilities)
*/
protected FlipBufferStrategy(int numBuffers, BufferCapabilities caps)
throws AWTException
{
if (!(Component.this instanceof Window) &&
!(Component.this instanceof Canvas))
{
throw new ClassCastException(
"Component must be a Canvas or Window");
}
this.numBuffers = numBuffers;
this.caps = caps;
createBuffers(numBuffers, caps);
}
/**
* Creates one or more complex, flipping buffers with the given
* capabilities.
* @param numBuffers number of buffers to create; must be greater than
* one
* @param caps the capabilities of the buffers.
* <code>BufferCapabilities.isPageFlipping</code> must be
* <code>true</code>.
* @exception AWTException if the capabilities supplied could not be
* supported or met
* @exception IllegalStateException if the component has no peer
* @exception IllegalArgumentException if numBuffers is less than two,
* or if <code>BufferCapabilities.isPageFlipping</code> is not
* <code>true</code>.
* @see java.awt.BufferCapabilities#isPageFlipping()
*/
protected void createBuffers(int numBuffers, BufferCapabilities caps)
throws AWTException
{
if (numBuffers < 2) {
throw new IllegalArgumentException(
"Number of buffers cannot be less than two");
} else if (peer == null) {
throw new IllegalStateException(
"Component must have a valid peer");
} else if (caps == null || !caps.isPageFlipping()) {
throw new IllegalArgumentException(
"Page flipping capabilities must be specified");
}
// save the current bounds
width = getWidth();
height = getHeight();
if (drawBuffer != null) {
// dispose the existing backbuffers
drawBuffer = null;
drawVBuffer = null;
destroyBuffers();
// ... then recreate the backbuffers
}
if (caps instanceof ExtendedBufferCapabilities) {
ExtendedBufferCapabilities ebc =
(ExtendedBufferCapabilities)caps;
if (ebc.getVSync() == VSYNC_ON) {
// if this buffer strategy is not allowed to be v-synced,
// change the caps that we pass to the peer but keep on
// trying to create v-synced buffers;
// do not throw IAE here in case it is disallowed, see
// ExtendedBufferCapabilities for more info
if (!VSyncedBSManager.vsyncAllowed(this)) {
caps = ebc.derive(VSYNC_DEFAULT);
}
}
}
peer.createBuffers(numBuffers, caps);
updateInternalBuffers();
}
/**
* Updates internal buffers (both volatile and non-volatile)
* by requesting the back-buffer from the peer.
*/
private void updateInternalBuffers() {
// get the images associated with the draw buffer
drawBuffer = getBackBuffer();
if (drawBuffer instanceof VolatileImage) {
drawVBuffer = (VolatileImage)drawBuffer;
} else {
drawVBuffer = null;
}
}
/**
* @return direct access to the back buffer, as an image.
* @exception IllegalStateException if the buffers have not yet
* been created
*/
protected Image getBackBuffer() {
if (peer != null) {
return peer.getBackBuffer();
} else {
throw new IllegalStateException(
"Component must have a valid peer");
}
}
/**
* Flipping moves the contents of the back buffer to the front buffer,
* either by copying or by moving the video pointer.
* @param flipAction an integer value describing the flipping action
* for the contents of the back buffer. This should be one of the
* values of the <code>BufferCapabilities.FlipContents</code>
* property.
* @exception IllegalStateException if the buffers have not yet
* been created
* @see java.awt.BufferCapabilities#getFlipContents()
*/
protected void flip(BufferCapabilities.FlipContents flipAction) {
if (peer != null) {
Image backBuffer = getBackBuffer();
if (backBuffer != null) {
peer.flip(0, 0,
backBuffer.getWidth(null),
backBuffer.getHeight(null), flipAction);
}
} else {
throw new IllegalStateException(
"Component must have a valid peer");
}
}
void flipSubRegion(int x1, int y1, int x2, int y2,
BufferCapabilities.FlipContents flipAction)
{
if (peer != null) {
peer.flip(x1, y1, x2, y2, flipAction);
} else {
throw new IllegalStateException(
"Component must have a valid peer");
}
}
/**
* Destroys the buffers created through this object
*/
protected void destroyBuffers() {
VSyncedBSManager.releaseVsync(this);
if (peer != null) {
peer.destroyBuffers();
} else {
throw new IllegalStateException(
"Component must have a valid peer");
}
}
/**
* @return the buffering capabilities of this strategy
*/
public BufferCapabilities getCapabilities() {
if (caps instanceof ProxyCapabilities) {
return ((ProxyCapabilities)caps).orig;
} else {
return caps;
}
}
/**
* @return the graphics on the drawing buffer. This method may not
* be synchronized for performance reasons; use of this method by multiple
* threads should be handled at the application level. Disposal of the
* graphics object must be handled by the application.
*/
public Graphics getDrawGraphics() {
revalidate();
return drawBuffer.getGraphics();
}
/**
* Restore the drawing buffer if it has been lost
*/
protected void revalidate() {
revalidate(true);
}
void revalidate(boolean checkSize) {
validatedContents = false;
if (checkSize && (getWidth() != width || getHeight() != height)) {
// component has been resized; recreate the backbuffers
try {
createBuffers(numBuffers, caps);
} catch (AWTException e) {
// shouldn't be possible
}
validatedContents = true;
}
// get the buffers from the peer every time since they
// might have been replaced in response to a display change event
updateInternalBuffers();
// now validate the backbuffer
if (drawVBuffer != null) {
GraphicsConfiguration gc =
getGraphicsConfiguration_NoClientCode();
int returnCode = drawVBuffer.validate(gc);
if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) {
try {
createBuffers(numBuffers, caps);
} catch (AWTException e) {
// shouldn't be possible
}
if (drawVBuffer != null) {
// backbuffers were recreated, so validate again
drawVBuffer.validate(gc);
}
validatedContents = true;
} else if (returnCode == VolatileImage.IMAGE_RESTORED) {
validatedContents = true;
}
}
}
/**
* @return whether the drawing buffer was lost since the last call to
* <code>getDrawGraphics</code>
*/
public boolean contentsLost() {
if (drawVBuffer == null) {
return false;
}
return drawVBuffer.contentsLost();
}
/**
* @return whether the drawing buffer was recently restored from a lost
* state and reinitialized to the default background color (white)
*/
public boolean contentsRestored() {
return validatedContents;
}
/**
* Makes the next available buffer visible by either blitting or
* flipping.
*/
public void show() {
flip(caps.getFlipContents());
}
/**
* Makes specified region of the the next available buffer visible
* by either blitting or flipping.
*/
void showSubRegion(int x1, int y1, int x2, int y2) {
flipSubRegion(x1, y1, x2, y2, caps.getFlipContents());
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void dispose() {
if (Component.this.bufferStrategy == this) {
Component.this.bufferStrategy = null;
if (peer != null) {
destroyBuffers();
}
}
}
} // Inner class FlipBufferStrategy
/**
* Inner class for blitting offscreen surfaces to a component.
*
* @author Michael Martak
* @since 1.4
*/
protected class BltBufferStrategy extends BufferStrategy {
/**
* The buffering capabilities
*/
protected BufferCapabilities caps; // = null
/**
* The back buffers
*/
protected VolatileImage[] backBuffers; // = null
/**
* Whether or not the drawing buffer has been recently restored from
* a lost state.
*/
protected boolean validatedContents; // = false
/**
* Size of the back buffers
*/
protected int width;
protected int height;
/**
* Insets for the hosting Component. The size of the back buffer
* is constrained by these.
*/
private Insets insets;
/**
* Creates a new blt buffer strategy around a component
* @param numBuffers number of buffers to create, including the
* front buffer
* @param caps the capabilities of the buffers
*/
protected BltBufferStrategy(int numBuffers, BufferCapabilities caps) {
this.caps = caps;
createBackBuffers(numBuffers - 1);
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void dispose() {
if (backBuffers != null) {
for (int counter = backBuffers.length - 1; counter >= 0;
counter--) {
if (backBuffers[counter] != null) {
backBuffers[counter].flush();
backBuffers[counter] = null;
}
}
}
if (Component.this.bufferStrategy == this) {
Component.this.bufferStrategy = null;
}
}
/**
* Creates the back buffers
*/
protected void createBackBuffers(int numBuffers) {
if (numBuffers == 0) {
backBuffers = null;
} else {
// save the current bounds
width = getWidth();
height = getHeight();
insets = getInsets_NoClientCode();
int iWidth = width - insets.left - insets.right;
int iHeight = height - insets.top - insets.bottom;
// It is possible for the component's width and/or height
// to be 0 here. Force the size of the backbuffers to
// be > 0 so that creating the image won't fail.
iWidth = Math.max(1, iWidth);
iHeight = Math.max(1, iHeight);
if (backBuffers == null) {
backBuffers = new VolatileImage[numBuffers];
} else {
// flush any existing backbuffers
for (int i = 0; i < numBuffers; i++) {
if (backBuffers[i] != null) {
backBuffers[i].flush();
backBuffers[i] = null;
}
}
}
// create the backbuffers
for (int i = 0; i < numBuffers; i++) {
backBuffers[i] = createVolatileImage(iWidth, iHeight);
}
}
}
/**
* @return the buffering capabilities of this strategy
*/
public BufferCapabilities getCapabilities() {
return caps;
}
/**
* @return the draw graphics
*/
public Graphics getDrawGraphics() {
revalidate();
Image backBuffer = getBackBuffer();
if (backBuffer == null) {
return getGraphics();
}
SunGraphics2D g = (SunGraphics2D)backBuffer.getGraphics();
g.constrain(-insets.left, -insets.top,
backBuffer.getWidth(null) + insets.left,
backBuffer.getHeight(null) + insets.top);
return g;
}
/**
* @return direct access to the back buffer, as an image.
* If there is no back buffer, returns null.
*/
Image getBackBuffer() {
if (backBuffers != null) {
return backBuffers[backBuffers.length - 1];
} else {
return null;
}
}
/**
* Makes the next available buffer visible.
*/
public void show() {
showSubRegion(insets.left, insets.top,
width - insets.right,
height - insets.bottom);
}
/**
* Package-private method to present a specific rectangular area
* of this buffer. This class currently shows only the entire
* buffer, by calling showSubRegion() with the full dimensions of
* the buffer. Subclasses (e.g., BltSubRegionBufferStrategy
* and FlipSubRegionBufferStrategy) may have region-specific show
* methods that call this method with actual sub regions of the
* buffer.
*/
void showSubRegion(int x1, int y1, int x2, int y2) {
if (backBuffers == null) {
return;
}
// Adjust location to be relative to client area.
x1 -= insets.left;
x2 -= insets.left;
y1 -= insets.top;
y2 -= insets.top;
Graphics g = getGraphics_NoClientCode();
if (g == null) {
// Not showing, bail
return;
}
try {
// First image copy is in terms of Frame's coordinates, need
// to translate to client area.
g.translate(insets.left, insets.top);
for (int i = 0; i < backBuffers.length; i++) {
g.drawImage(backBuffers[i],
x1, y1, x2, y2,
x1, y1, x2, y2,
null);
g.dispose();
g = null;
g = backBuffers[i].getGraphics();
}
} finally {
if (g != null) {
g.dispose();
}
}
}
/**
* Restore the drawing buffer if it has been lost
*/
protected void revalidate() {
revalidate(true);
}
void revalidate(boolean checkSize) {
validatedContents = false;
if (backBuffers == null) {
return;
}
if (checkSize) {
Insets insets = getInsets_NoClientCode();
if (getWidth() != width || getHeight() != height ||
!insets.equals(this.insets)) {
// component has been resized; recreate the backbuffers
createBackBuffers(backBuffers.length);
validatedContents = true;
}
}
// now validate the backbuffer
GraphicsConfiguration gc = getGraphicsConfiguration_NoClientCode();
int returnCode =
backBuffers[backBuffers.length - 1].validate(gc);
if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) {
if (checkSize) {
createBackBuffers(backBuffers.length);
// backbuffers were recreated, so validate again
backBuffers[backBuffers.length - 1].validate(gc);
}
// else case means we're called from Swing on the toolkit
// thread, don't recreate buffers as that'll deadlock
// (creating VolatileImages invokes getting GraphicsConfig
// which grabs treelock).
validatedContents = true;
} else if (returnCode == VolatileImage.IMAGE_RESTORED) {
validatedContents = true;
}
}
/**
* @return whether the drawing buffer was lost since the last call to
* <code>getDrawGraphics</code>
*/
public boolean contentsLost() {
if (backBuffers == null) {
return false;
} else {
return backBuffers[backBuffers.length - 1].contentsLost();
}
}
/**
* @return whether the drawing buffer was recently restored from a lost
* state and reinitialized to the default background color (white)
*/
public boolean contentsRestored() {
return validatedContents;
}
} // Inner class BltBufferStrategy
/**
* Private class to perform sub-region flipping.
*/
private class FlipSubRegionBufferStrategy extends FlipBufferStrategy
implements SubRegionShowable
{
protected FlipSubRegionBufferStrategy(int numBuffers,
BufferCapabilities caps)
throws AWTException
{
super(numBuffers, caps);
}
public void show(int x1, int y1, int x2, int y2) {
showSubRegion(x1, y1, x2, y2);
}
// This is invoked by Swing on the toolkit thread.
public boolean showIfNotLost(int x1, int y1, int x2, int y2) {
if (!contentsLost()) {
showSubRegion(x1, y1, x2, y2);
return !contentsLost();
}
return false;
}
}
/**
* Private class to perform sub-region blitting. Swing will use
* this subclass via the SubRegionShowable interface in order to
* copy only the area changed during a repaint.
* See javax.swing.BufferStrategyPaintManager.
*/
private class BltSubRegionBufferStrategy extends BltBufferStrategy
implements SubRegionShowable
{
protected BltSubRegionBufferStrategy(int numBuffers,
BufferCapabilities caps)
{
super(numBuffers, caps);
}
public void show(int x1, int y1, int x2, int y2) {
showSubRegion(x1, y1, x2, y2);
}
// This method is called by Swing on the toolkit thread.
public boolean showIfNotLost(int x1, int y1, int x2, int y2) {
if (!contentsLost()) {
showSubRegion(x1, y1, x2, y2);
return !contentsLost();
}
return false;
}
}
/**
* Inner class for flipping buffers on a component. That component must
* be a <code>Canvas</code> or <code>Window</code>.
* @see Canvas
* @see Window
* @see java.awt.image.BufferStrategy
* @author Michael Martak
* @since 1.4
*/
private class SingleBufferStrategy extends BufferStrategy {
private BufferCapabilities caps;
public SingleBufferStrategy(BufferCapabilities caps) {
this.caps = caps;
}
public BufferCapabilities getCapabilities() {
return caps;
}
public Graphics getDrawGraphics() {
return getGraphics();
}
public boolean contentsLost() {
return false;
}
public boolean contentsRestored() {
return false;
}
public void show() {
// Do nothing
}
} // Inner class SingleBufferStrategy
/**
* Sets whether or not paint messages received from the operating system
* should be ignored. This does not affect paint events generated in
* software by the AWT, unless they are an immediate response to an
* OS-level paint message.
* <p>
* This is useful, for example, if running under full-screen mode and
* better performance is desired, or if page-flipping is used as the
* buffer strategy.
*
* @since 1.4
* @see #getIgnoreRepaint
* @see Canvas#createBufferStrategy
* @see Window#createBufferStrategy
* @see java.awt.image.BufferStrategy
* @see GraphicsDevice#setFullScreenWindow
*/
public void setIgnoreRepaint(boolean ignoreRepaint) {
this.ignoreRepaint = ignoreRepaint;
}
/**
* @return whether or not paint messages received from the operating system
* should be ignored.
*
* @since 1.4
* @see #setIgnoreRepaint
*/
public boolean getIgnoreRepaint() {
return ignoreRepaint;
}
/**
* Checks whether this component "contains" the specified point,
* where <code>x</code> and <code>y</code> are defined to be
* relative to the coordinate system of this component.
* @param x the <i>x</i> coordinate of the point
* @param y the <i>y</i> coordinate of the point
* @see #getComponentAt(int, int)
* @since JDK1.1
*/
public boolean contains(int x, int y) {
return inside(x, y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by contains(int, int).
*/
@Deprecated
public boolean inside(int x, int y) {
return (x >= 0) && (x < width) && (y >= 0) && (y < height);
}
/**
* Checks whether this component "contains" the specified point,
* where the point's <i>x</i> and <i>y</i> coordinates are defined
* to be relative to the coordinate system of this component.
* @param p the point
* @throws NullPointerException if {@code p} is {@code null}
* @see #getComponentAt(Point)
* @since JDK1.1
*/
public boolean contains(Point p) {
return contains(p.x, p.y);
}
/**
* Determines if this component or one of its immediate
* subcomponents contains the (<i>x</i>, <i>y</i>) location,
* and if so, returns the containing component. This method only
* looks one level deep. If the point (<i>x</i>, <i>y</i>) is
* inside a subcomponent that itself has subcomponents, it does not
* go looking down the subcomponent tree.
* <p>
* The <code>locate</code> method of <code>Component</code> simply
* returns the component itself if the (<i>x</i>, <i>y</i>)
* coordinate location is inside its bounding box, and <code>null</code>
* otherwise.
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @return the component or subcomponent that contains the
* (<i>x</i>, <i>y</i>) location;
* <code>null</code> if the location
* is outside this component
* @see #contains(int, int)
* @since JDK1.0
*/
public Component getComponentAt(int x, int y) {
return locate(x, y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by getComponentAt(int, int).
*/
@Deprecated
public Component locate(int x, int y) {
return contains(x, y) ? this : null;
}
/**
* Returns the component or subcomponent that contains the
* specified point.
* @param p the point
* @see java.awt.Component#contains
* @since JDK1.1
*/
public Component getComponentAt(Point p) {
return getComponentAt(p.x, p.y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>dispatchEvent(AWTEvent e)</code>.
*/
@Deprecated
public void deliverEvent(Event e) {
postEvent(e);
}
/**
* Dispatches an event to this component or one of its sub components.
* Calls <code>processEvent</code> before returning for 1.1-style
* events which have been enabled for the <code>Component</code>.
* @param e the event
*/
public final void dispatchEvent(AWTEvent e) {
dispatchEventImpl(e);
}
@SuppressWarnings("deprecation")
void dispatchEventImpl(AWTEvent e) {
int id = e.getID();
// Check that this component belongs to this app-context
AppContext compContext = appContext;
if (compContext != null && !compContext.equals(AppContext.getAppContext())) {
if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
eventLog.fine("Event " + e + " is being dispatched on the wrong AppContext");
}
}
if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
eventLog.finest("{0}", e);
}
/*
* 0. Set timestamp and modifiers of current event.
*/
if (!(e instanceof KeyEvent)) {
// Timestamp of a key event is set later in DKFM.preDispatchKeyEvent(KeyEvent).
EventQueue.setCurrentEventAndMostRecentTime(e);
}
/*
* 1. Pre-dispatchers. Do any necessary retargeting/reordering here
* before we notify AWTEventListeners.
*/
if (e instanceof SunDropTargetEvent) {
((SunDropTargetEvent)e).dispatch();
return;
}
if (!e.focusManagerIsDispatching) {
// Invoke the private focus retargeting method which provides
// lightweight Component support
if (e.isPosted) {
e = KeyboardFocusManager.retargetFocusEvent(e);
e.isPosted = true;
}
// Now, with the event properly targeted to a lightweight
// descendant if necessary, invoke the public focus retargeting
// and dispatching function
if (KeyboardFocusManager.getCurrentKeyboardFocusManager().
dispatchEvent(e))
{
return;
}
}
if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("" + e);
}
// MouseWheel may need to be retargeted here so that
// AWTEventListener sees the event go to the correct
// Component. If the MouseWheelEvent needs to go to an ancestor,
// the event is dispatched to the ancestor, and dispatching here
// stops.
if (id == MouseEvent.MOUSE_WHEEL &&
(!eventTypeEnabled(id)) &&
(peer != null && !peer.handlesWheelScrolling()) &&
(dispatchMouseWheelToAncestor((MouseWheelEvent)e)))
{
return;
}
/*
* 2. Allow the Toolkit to pass this to AWTEventListeners.
*/
Toolkit toolkit = Toolkit.getDefaultToolkit();
toolkit.notifyAWTEventListeners(e);
/*
* 3. If no one has consumed a key event, allow the
* KeyboardFocusManager to process it.
*/
if (!e.isConsumed()) {
if (e instanceof java.awt.event.KeyEvent) {
KeyboardFocusManager.getCurrentKeyboardFocusManager().
processKeyEvent(this, (KeyEvent)e);
if (e.isConsumed()) {
return;
}
}
}
/*
* 4. Allow input methods to process the event
*/
if (areInputMethodsEnabled()) {
// We need to pass on InputMethodEvents since some host
// input method adapters send them through the Java
// event queue instead of directly to the component,
// and the input context also handles the Java composition window
if(((e instanceof InputMethodEvent) && !(this instanceof CompositionArea))
||
// Otherwise, we only pass on input and focus events, because
// a) input methods shouldn't know about semantic or component-level events
// b) passing on the events takes time
// c) isConsumed() is always true for semantic events.
(e instanceof InputEvent) || (e instanceof FocusEvent)) {
InputContext inputContext = getInputContext();
if (inputContext != null) {
inputContext.dispatchEvent(e);
if (e.isConsumed()) {
if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("3579: Skipping " + e);
}
return;
}
}
}
} else {
// When non-clients get focus, we need to explicitly disable the native
// input method. The native input method is actually not disabled when
// the active/passive/peered clients loose focus.
if (id == FocusEvent.FOCUS_GAINED) {
InputContext inputContext = getInputContext();
if (inputContext != null && inputContext instanceof sun.awt.im.InputContext) {
((sun.awt.im.InputContext)inputContext).disableNativeIM();
}
}
}
/*
* 5. Pre-process any special events before delivery
*/
switch(id) {
// Handling of the PAINT and UPDATE events is now done in the
// peer's handleEvent() method so the background can be cleared
// selectively for non-native components on Windows only.
// - Fred.Ecks@Eng.sun.com, 5-8-98
case KeyEvent.KEY_PRESSED:
case KeyEvent.KEY_RELEASED:
Container p = (Container)((this instanceof Container) ? this : parent);
if (p != null) {
p.preProcessKeyEvent((KeyEvent)e);
if (e.isConsumed()) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Pre-process consumed event");
}
return;
}
}
break;
case WindowEvent.WINDOW_CLOSING:
if (toolkit instanceof WindowClosingListener) {
windowClosingException = ((WindowClosingListener)
toolkit).windowClosingNotify((WindowEvent)e);
if (checkWindowClosingException()) {
return;
}
}
break;
default:
break;
}
/*
* 6. Deliver event for normal processing
*/
if (newEventsOnly) {
// Filtering needs to really be moved to happen at a lower
// level in order to get maximum performance gain; it is
// here temporarily to ensure the API spec is honored.
//
if (eventEnabled(e)) {
processEvent(e);
}
} else if (id == MouseEvent.MOUSE_WHEEL) {
// newEventsOnly will be false for a listenerless ScrollPane, but
// MouseWheelEvents still need to be dispatched to it so scrolling
// can be done.
autoProcessMouseWheel((MouseWheelEvent)e);
} else if (!(e instanceof MouseEvent && !postsOldMouseEvents())) {
//
// backward compatibility
//
Event olde = e.convertToOld();
if (olde != null) {
int key = olde.key;
int modifiers = olde.modifiers;
postEvent(olde);
if (olde.isConsumed()) {
e.consume();
}
// if target changed key or modifier values, copy them
// back to original event
//
switch(olde.id) {
case Event.KEY_PRESS:
case Event.KEY_RELEASE:
case Event.KEY_ACTION:
case Event.KEY_ACTION_RELEASE:
if (olde.key != key) {
((KeyEvent)e).setKeyChar(olde.getKeyEventChar());
}
if (olde.modifiers != modifiers) {
((KeyEvent)e).setModifiers(olde.modifiers);
}
break;
default:
break;
}
}
}
/*
* 8. Special handling for 4061116 : Hook for browser to close modal
* dialogs.
*/
if (id == WindowEvent.WINDOW_CLOSING && !e.isConsumed()) {
if (toolkit instanceof WindowClosingListener) {
windowClosingException =
((WindowClosingListener)toolkit).
windowClosingDelivered((WindowEvent)e);
if (checkWindowClosingException()) {
return;
}
}
}
/*
* 9. Allow the peer to process the event.
* Except KeyEvents, they will be processed by peer after
* all KeyEventPostProcessors
* (see DefaultKeyboardFocusManager.dispatchKeyEvent())
*/
if (!(e instanceof KeyEvent)) {
ComponentPeer tpeer = peer;
if (e instanceof FocusEvent && (tpeer == null || tpeer instanceof LightweightPeer)) {
// if focus owner is lightweight then its native container
// processes event
Component source = (Component)e.getSource();
if (source != null) {
Container target = source.getNativeContainer();
if (target != null) {
tpeer = target.getPeer();
}
}
}
if (tpeer != null) {
tpeer.handleEvent(e);
}
}
} // dispatchEventImpl()
/*
* If newEventsOnly is false, method is called so that ScrollPane can
* override it and handle common-case mouse wheel scrolling. NOP
* for Component.
*/
void autoProcessMouseWheel(MouseWheelEvent e) {}
/*
* Dispatch given MouseWheelEvent to the first ancestor for which
* MouseWheelEvents are enabled.
*
* Returns whether or not event was dispatched to an ancestor
*/
boolean dispatchMouseWheelToAncestor(MouseWheelEvent e) {
int newX, newY;
newX = e.getX() + getX(); // Coordinates take into account at least
newY = e.getY() + getY(); // the cursor's position relative to this
// Component (e.getX()), and this Component's
// position relative to its parent.
MouseWheelEvent newMWE;
if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
eventLog.finest("dispatchMouseWheelToAncestor");
eventLog.finest("orig event src is of " + e.getSource().getClass());
}
/* parent field for Window refers to the owning Window.
* MouseWheelEvents should NOT be propagated into owning Windows
*/
synchronized (getTreeLock()) {
Container anc = getParent();
while (anc != null && !anc.eventEnabled(e)) {
// fix coordinates to be relative to new event source
newX += anc.getX();
newY += anc.getY();
if (!(anc instanceof Window)) {
anc = anc.getParent();
}
else {
break;
}
}
if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
eventLog.finest("new event src is " + anc.getClass());
}
if (anc != null && anc.eventEnabled(e)) {
// Change event to be from new source, with new x,y
// For now, just create a new event - yucky
newMWE = new MouseWheelEvent(anc, // new source
e.getID(),
e.getWhen(),
e.getModifiers(),
newX, // x relative to new source
newY, // y relative to new source
e.getXOnScreen(),
e.getYOnScreen(),
e.getClickCount(),
e.isPopupTrigger(),
e.getScrollType(),
e.getScrollAmount(),
e.getWheelRotation(),
e.getPreciseWheelRotation());
((AWTEvent)e).copyPrivateDataInto(newMWE);
// When dispatching a wheel event to
// ancestor, there is no need trying to find descendant
// lightweights to dispatch event to.
// If we dispatch the event to toplevel ancestor,
// this could encolse the loop: 6480024.
anc.dispatchEventToSelf(newMWE);
if (newMWE.isConsumed()) {
e.consume();
}
return true;
}
}
return false;
}
boolean checkWindowClosingException() {
if (windowClosingException != null) {
if (this instanceof Dialog) {
((Dialog)this).interruptBlocking();
} else {
windowClosingException.fillInStackTrace();
windowClosingException.printStackTrace();
windowClosingException = null;
}
return true;
}
return false;
}
boolean areInputMethodsEnabled() {
// in 1.2, we assume input method support is required for all
// components that handle key events, but components can turn off
// input methods by calling enableInputMethods(false).
return ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) &&
((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 || keyListener != null);
}
// REMIND: remove when filtering is handled at lower level
boolean eventEnabled(AWTEvent e) {
return eventTypeEnabled(e.id);
}
boolean eventTypeEnabled(int type) {
switch(type) {
case ComponentEvent.COMPONENT_MOVED:
case ComponentEvent.COMPONENT_RESIZED:
case ComponentEvent.COMPONENT_SHOWN:
case ComponentEvent.COMPONENT_HIDDEN:
if ((eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 ||
componentListener != null) {
return true;
}
break;
case FocusEvent.FOCUS_GAINED:
case FocusEvent.FOCUS_LOST:
if ((eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 ||
focusListener != null) {
return true;
}
break;
case KeyEvent.KEY_PRESSED:
case KeyEvent.KEY_RELEASED:
case KeyEvent.KEY_TYPED:
if ((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 ||
keyListener != null) {
return true;
}
break;
case MouseEvent.MOUSE_PRESSED:
case MouseEvent.MOUSE_RELEASED:
case MouseEvent.MOUSE_ENTERED:
case MouseEvent.MOUSE_EXITED:
case MouseEvent.MOUSE_CLICKED:
if ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 ||
mouseListener != null) {
return true;
}
break;
case MouseEvent.MOUSE_MOVED:
case MouseEvent.MOUSE_DRAGGED:
if ((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 ||
mouseMotionListener != null) {
return true;
}
break;
case MouseEvent.MOUSE_WHEEL:
if ((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 ||
mouseWheelListener != null) {
return true;
}
break;
case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
case InputMethodEvent.CARET_POSITION_CHANGED:
if ((eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 ||
inputMethodListener != null) {
return true;
}
break;
case HierarchyEvent.HIERARCHY_CHANGED:
if ((eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
hierarchyListener != null) {
return true;
}
break;
case HierarchyEvent.ANCESTOR_MOVED:
case HierarchyEvent.ANCESTOR_RESIZED:
if ((eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
hierarchyBoundsListener != null) {
return true;
}
break;
case ActionEvent.ACTION_PERFORMED:
if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0) {
return true;
}
break;
case TextEvent.TEXT_VALUE_CHANGED:
if ((eventMask & AWTEvent.TEXT_EVENT_MASK) != 0) {
return true;
}
break;
case ItemEvent.ITEM_STATE_CHANGED:
if ((eventMask & AWTEvent.ITEM_EVENT_MASK) != 0) {
return true;
}
break;
case AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED:
if ((eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0) {
return true;
}
break;
default:
break;
}
//
// Always pass on events defined by external programs.
//
if (type > AWTEvent.RESERVED_ID_MAX) {
return true;
}
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by dispatchEvent(AWTEvent).
*/
@Deprecated
public boolean postEvent(Event e) {
ComponentPeer peer = this.peer;
if (handleEvent(e)) {
e.consume();
return true;
}
Component parent = this.parent;
int eventx = e.x;
int eventy = e.y;
if (parent != null) {
e.translate(x, y);
if (parent.postEvent(e)) {
e.consume();
return true;
}
// restore coords
e.x = eventx;
e.y = eventy;
}
return false;
}
// Event source interfaces
/**
* Adds the specified component listener to receive component events from
* this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the component listener
* @see java.awt.event.ComponentEvent
* @see java.awt.event.ComponentListener
* @see #removeComponentListener
* @see #getComponentListeners
* @since JDK1.1
*/
public synchronized void addComponentListener(ComponentListener l) {
if (l == null) {
return;
}
componentListener = AWTEventMulticaster.add(componentListener, l);
newEventsOnly = true;
}
/**
* Removes the specified component listener so that it no longer
* receives component events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
* @param l the component listener
* @see java.awt.event.ComponentEvent
* @see java.awt.event.ComponentListener
* @see #addComponentListener
* @see #getComponentListeners
* @since JDK1.1
*/
public synchronized void removeComponentListener(ComponentListener l) {
if (l == null) {
return;
}
componentListener = AWTEventMulticaster.remove(componentListener, l);
}
/**
* Returns an array of all the component listeners
* registered on this component.
*
* @return all <code>ComponentListener</code>s of this component
* or an empty array if no component
* listeners are currently registered
*
* @see #addComponentListener
* @see #removeComponentListener
* @since 1.4
*/
public synchronized ComponentListener[] getComponentListeners() {
return getListeners(ComponentListener.class);
}
/**
* Adds the specified focus listener to receive focus events from
* this component when this component gains input focus.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the focus listener
* @see java.awt.event.FocusEvent
* @see java.awt.event.FocusListener
* @see #removeFocusListener
* @see #getFocusListeners
* @since JDK1.1
*/
public synchronized void addFocusListener(FocusListener l) {
if (l == null) {
return;
}
focusListener = AWTEventMulticaster.add(focusListener, l);
newEventsOnly = true;
// if this is a lightweight component, enable focus events
// in the native container.
if (peer instanceof LightweightPeer) {
parent.proxyEnableEvents(AWTEvent.FOCUS_EVENT_MASK);
}
}
/**
* Removes the specified focus listener so that it no longer
* receives focus events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the focus listener
* @see java.awt.event.FocusEvent
* @see java.awt.event.FocusListener
* @see #addFocusListener
* @see #getFocusListeners
* @since JDK1.1
*/
public synchronized void removeFocusListener(FocusListener l) {
if (l == null) {
return;
}
focusListener = AWTEventMulticaster.remove(focusListener, l);
}
/**
* Returns an array of all the focus listeners
* registered on this component.
*
* @return all of this component's <code>FocusListener</code>s
* or an empty array if no component
* listeners are currently registered
*
* @see #addFocusListener
* @see #removeFocusListener
* @since 1.4
*/
public synchronized FocusListener[] getFocusListeners() {
return getListeners(FocusListener.class);
}
/**
* Adds the specified hierarchy listener to receive hierarchy changed
* events from this component when the hierarchy to which this container
* belongs changes.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyListener
* @see #removeHierarchyListener
* @see #getHierarchyListeners
* @since 1.3
*/
public void addHierarchyListener(HierarchyListener l) {
if (l == null) {
return;
}
boolean notifyAncestors;
synchronized (this) {
notifyAncestors =
(hierarchyListener == null &&
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0);
hierarchyListener = AWTEventMulticaster.add(hierarchyListener, l);
notifyAncestors = (notifyAncestors && hierarchyListener != null);
newEventsOnly = true;
}
if (notifyAncestors) {
synchronized (getTreeLock()) {
adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK,
1);
}
}
}
/**
* Removes the specified hierarchy listener so that it no longer
* receives hierarchy changed events from this component. This method
* performs no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyListener
* @see #addHierarchyListener
* @see #getHierarchyListeners
* @since 1.3
*/
public void removeHierarchyListener(HierarchyListener l) {
if (l == null) {
return;
}
boolean notifyAncestors;
synchronized (this) {
notifyAncestors =
(hierarchyListener != null &&
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0);
hierarchyListener =
AWTEventMulticaster.remove(hierarchyListener, l);
notifyAncestors = (notifyAncestors && hierarchyListener == null);
}
if (notifyAncestors) {
synchronized (getTreeLock()) {
adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK,
-1);
}
}
}
/**
* Returns an array of all the hierarchy listeners
* registered on this component.
*
* @return all of this component's <code>HierarchyListener</code>s
* or an empty array if no hierarchy
* listeners are currently registered
*
* @see #addHierarchyListener
* @see #removeHierarchyListener
* @since 1.4
*/
public synchronized HierarchyListener[] getHierarchyListeners() {
return getListeners(HierarchyListener.class);
}
/**
* Adds the specified hierarchy bounds listener to receive hierarchy
* bounds events from this component when the hierarchy to which this
* container belongs changes.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy bounds listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyBoundsListener
* @see #removeHierarchyBoundsListener
* @see #getHierarchyBoundsListeners
* @since 1.3
*/
public void addHierarchyBoundsListener(HierarchyBoundsListener l) {
if (l == null) {
return;
}
boolean notifyAncestors;
synchronized (this) {
notifyAncestors =
(hierarchyBoundsListener == null &&
(eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0);
hierarchyBoundsListener =
AWTEventMulticaster.add(hierarchyBoundsListener, l);
notifyAncestors = (notifyAncestors &&
hierarchyBoundsListener != null);
newEventsOnly = true;
}
if (notifyAncestors) {
synchronized (getTreeLock()) {
adjustListeningChildrenOnParent(
AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, 1);
}
}
}
/**
* Removes the specified hierarchy bounds listener so that it no longer
* receives hierarchy bounds events from this component. This method
* performs no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy bounds listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyBoundsListener
* @see #addHierarchyBoundsListener
* @see #getHierarchyBoundsListeners
* @since 1.3
*/
public void removeHierarchyBoundsListener(HierarchyBoundsListener l) {
if (l == null) {
return;
}
boolean notifyAncestors;
synchronized (this) {
notifyAncestors =
(hierarchyBoundsListener != null &&
(eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0);
hierarchyBoundsListener =
AWTEventMulticaster.remove(hierarchyBoundsListener, l);
notifyAncestors = (notifyAncestors &&
hierarchyBoundsListener == null);
}
if (notifyAncestors) {
synchronized (getTreeLock()) {
adjustListeningChildrenOnParent(
AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, -1);
}
}
}
// Should only be called while holding the tree lock
int numListening(long mask) {
// One mask or the other, but not neither or both.
if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
if ((mask != AWTEvent.HIERARCHY_EVENT_MASK) &&
(mask != AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK))
{
eventLog.fine("Assertion failed");
}
}
if ((mask == AWTEvent.HIERARCHY_EVENT_MASK &&
(hierarchyListener != null ||
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0)) ||
(mask == AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK &&
(hierarchyBoundsListener != null ||
(eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0))) {
return 1;
} else {
return 0;
}
}
// Should only be called while holding tree lock
int countHierarchyMembers() {
return 1;
}
// Should only be called while holding the tree lock
int createHierarchyEvents(int id, Component changed,
Container changedParent, long changeFlags,
boolean enabledOnToolkit) {
switch (id) {
case HierarchyEvent.HIERARCHY_CHANGED:
if (hierarchyListener != null ||
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
enabledOnToolkit) {
HierarchyEvent e = new HierarchyEvent(this, id, changed,
changedParent,
changeFlags);
dispatchEvent(e);
return 1;
}
break;
case HierarchyEvent.ANCESTOR_MOVED:
case HierarchyEvent.ANCESTOR_RESIZED:
if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
if (changeFlags != 0) {
eventLog.fine("Assertion (changeFlags == 0) failed");
}
}
if (hierarchyBoundsListener != null ||
(eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
enabledOnToolkit) {
HierarchyEvent e = new HierarchyEvent(this, id, changed,
changedParent);
dispatchEvent(e);
return 1;
}
break;
default:
// assert false
if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
eventLog.fine("This code must never be reached");
}
break;
}
return 0;
}
/**
* Returns an array of all the hierarchy bounds listeners
* registered on this component.
*
* @return all of this component's <code>HierarchyBoundsListener</code>s
* or an empty array if no hierarchy bounds
* listeners are currently registered
*
* @see #addHierarchyBoundsListener
* @see #removeHierarchyBoundsListener
* @since 1.4
*/
public synchronized HierarchyBoundsListener[] getHierarchyBoundsListeners() {
return getListeners(HierarchyBoundsListener.class);
}
/*
* Should only be called while holding the tree lock.
* It's added only for overriding in java.awt.Window
* because parent in Window is owner.
*/
void adjustListeningChildrenOnParent(long mask, int num) {
if (parent != null) {
parent.adjustListeningChildren(mask, num);
}
}
/**
* Adds the specified key listener to receive key events from
* this component.
* If l is null, no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the key listener.
* @see java.awt.event.KeyEvent
* @see java.awt.event.KeyListener
* @see #removeKeyListener
* @see #getKeyListeners
* @since JDK1.1
*/
public synchronized void addKeyListener(KeyListener l) {
if (l == null) {
return;
}
keyListener = AWTEventMulticaster.add(keyListener, l);
newEventsOnly = true;
// if this is a lightweight component, enable key events
// in the native container.
if (peer instanceof LightweightPeer) {
parent.proxyEnableEvents(AWTEvent.KEY_EVENT_MASK);
}
}
/**
* Removes the specified key listener so that it no longer
* receives key events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the key listener
* @see java.awt.event.KeyEvent
* @see java.awt.event.KeyListener
* @see #addKeyListener
* @see #getKeyListeners
* @since JDK1.1
*/
public synchronized void removeKeyListener(KeyListener l) {
if (l == null) {
return;
}
keyListener = AWTEventMulticaster.remove(keyListener, l);
}
/**
* Returns an array of all the key listeners
* registered on this component.
*
* @return all of this component's <code>KeyListener</code>s
* or an empty array if no key
* listeners are currently registered
*
* @see #addKeyListener
* @see #removeKeyListener
* @since 1.4
*/
public synchronized KeyListener[] getKeyListeners() {
return getListeners(KeyListener.class);
}
/**
* Adds the specified mouse listener to receive mouse events from
* this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseListener
* @see #removeMouseListener
* @see #getMouseListeners
* @since JDK1.1
*/
public synchronized void addMouseListener(MouseListener l) {
if (l == null) {
return;
}
mouseListener = AWTEventMulticaster.add(mouseListener,l);
newEventsOnly = true;
// if this is a lightweight component, enable mouse events
// in the native container.
if (peer instanceof LightweightPeer) {
parent.proxyEnableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
}
/**
* Removes the specified mouse listener so that it no longer
* receives mouse events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseListener
* @see #addMouseListener
* @see #getMouseListeners
* @since JDK1.1
*/
public synchronized void removeMouseListener(MouseListener l) {
if (l == null) {
return;
}
mouseListener = AWTEventMulticaster.remove(mouseListener, l);
}
/**
* Returns an array of all the mouse listeners
* registered on this component.
*
* @return all of this component's <code>MouseListener</code>s
* or an empty array if no mouse
* listeners are currently registered
*
* @see #addMouseListener
* @see #removeMouseListener
* @since 1.4
*/
public synchronized MouseListener[] getMouseListeners() {
return getListeners(MouseListener.class);
}
/**
* Adds the specified mouse motion listener to receive mouse motion
* events from this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse motion listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseMotionListener
* @see #removeMouseMotionListener
* @see #getMouseMotionListeners
* @since JDK1.1
*/
public synchronized void addMouseMotionListener(MouseMotionListener l) {
if (l == null) {
return;
}
mouseMotionListener = AWTEventMulticaster.add(mouseMotionListener,l);
newEventsOnly = true;
// if this is a lightweight component, enable mouse events
// in the native container.
if (peer instanceof LightweightPeer) {
parent.proxyEnableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
}
}
/**
* Removes the specified mouse motion listener so that it no longer
* receives mouse motion events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse motion listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseMotionListener
* @see #addMouseMotionListener
* @see #getMouseMotionListeners
* @since JDK1.1
*/
public synchronized void removeMouseMotionListener(MouseMotionListener l) {
if (l == null) {
return;
}
mouseMotionListener = AWTEventMulticaster.remove(mouseMotionListener, l);
}
/**
* Returns an array of all the mouse motion listeners
* registered on this component.
*
* @return all of this component's <code>MouseMotionListener</code>s
* or an empty array if no mouse motion
* listeners are currently registered
*
* @see #addMouseMotionListener
* @see #removeMouseMotionListener
* @since 1.4
*/
public synchronized MouseMotionListener[] getMouseMotionListeners() {
return getListeners(MouseMotionListener.class);
}
/**
* Adds the specified mouse wheel listener to receive mouse wheel events
* from this component. Containers also receive mouse wheel events from
* sub-components.
* <p>
* For information on how mouse wheel events are dispatched, see
* the class description for {@link MouseWheelEvent}.
* <p>
* If l is <code>null</code>, no exception is thrown and no
* action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse wheel listener
* @see java.awt.event.MouseWheelEvent
* @see java.awt.event.MouseWheelListener
* @see #removeMouseWheelListener
* @see #getMouseWheelListeners
* @since 1.4
*/
public synchronized void addMouseWheelListener(MouseWheelListener l) {
if (l == null) {
return;
}
mouseWheelListener = AWTEventMulticaster.add(mouseWheelListener,l);
newEventsOnly = true;
// if this is a lightweight component, enable mouse events
// in the native container.
if (peer instanceof LightweightPeer) {
parent.proxyEnableEvents(AWTEvent.MOUSE_WHEEL_EVENT_MASK);
}
}
/**
* Removes the specified mouse wheel listener so that it no longer
* receives mouse wheel events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If l is null, no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse wheel listener.
* @see java.awt.event.MouseWheelEvent
* @see java.awt.event.MouseWheelListener
* @see #addMouseWheelListener
* @see #getMouseWheelListeners
* @since 1.4
*/
public synchronized void removeMouseWheelListener(MouseWheelListener l) {
if (l == null) {
return;
}
mouseWheelListener = AWTEventMulticaster.remove(mouseWheelListener, l);
}
/**
* Returns an array of all the mouse wheel listeners
* registered on this component.
*
* @return all of this component's <code>MouseWheelListener</code>s
* or an empty array if no mouse wheel
* listeners are currently registered
*
* @see #addMouseWheelListener
* @see #removeMouseWheelListener
* @since 1.4
*/
public synchronized MouseWheelListener[] getMouseWheelListeners() {
return getListeners(MouseWheelListener.class);
}
/**
* Adds the specified input method listener to receive
* input method events from this component. A component will
* only receive input method events from input methods
* if it also overrides <code>getInputMethodRequests</code> to return an
* <code>InputMethodRequests</code> instance.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="{@docRoot}/java/awt/doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the input method listener
* @see java.awt.event.InputMethodEvent
* @see java.awt.event.InputMethodListener
* @see #removeInputMethodListener
* @see #getInputMethodListeners
* @see #getInputMethodRequests
* @since 1.2
*/
public synchronized void addInputMethodListener(InputMethodListener l) {
if (l == null) {
return;
}
inputMethodListener = AWTEventMulticaster.add(inputMethodListener, l);
newEventsOnly = true;
}
/**
* Removes the specified input method listener so that it no longer
* receives input method events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the input method listener
* @see java.awt.event.InputMethodEvent
* @see java.awt.event.InputMethodListener
* @see #addInputMethodListener
* @see #getInputMethodListeners
* @since 1.2
*/
public synchronized void removeInputMethodListener(InputMethodListener l) {
if (l == null) {
return;
}
inputMethodListener = AWTEventMulticaster.remove(inputMethodListener, l);
}
/**
* Returns an array of all the input method listeners
* registered on this component.
*
* @return all of this component's <code>InputMethodListener</code>s
* or an empty array if no input method
* listeners are currently registered
*
* @see #addInputMethodListener
* @see #removeInputMethodListener
* @since 1.4
*/
public synchronized InputMethodListener[] getInputMethodListeners() {
return getListeners(InputMethodListener.class);
}
/**
* Returns an array of all the objects currently registered
* as <code><em>Foo</em>Listener</code>s
* upon this <code>Component</code>.
* <code><em>Foo</em>Listener</code>s are registered using the
* <code>add<em>Foo</em>Listener</code> method.
*
* <p>
* You can specify the <code>listenerType</code> argument
* with a class literal, such as
* <code><em>Foo</em>Listener.class</code>.
* For example, you can query a
* <code>Component</code> <code>c</code>
* for its mouse listeners with the following code:
*
* <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre>
*
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter
* should specify an interface that descends from
* <code>java.util.EventListener</code>
* @return an array of all objects registered as
* <code><em>Foo</em>Listener</code>s on this component,
* or an empty array if no such listeners have been added
* @exception ClassCastException if <code>listenerType</code>
* doesn't specify a class or interface that implements
* <code>java.util.EventListener</code>
* @throws NullPointerException if {@code listenerType} is {@code null}
* @see #getComponentListeners
* @see #getFocusListeners
* @see #getHierarchyListeners
* @see #getHierarchyBoundsListeners
* @see #getKeyListeners
* @see #getMouseListeners
* @see #getMouseMotionListeners
* @see #getMouseWheelListeners
* @see #getInputMethodListeners
* @see #getPropertyChangeListeners
*
* @since 1.3
*/
@SuppressWarnings("unchecked")
public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
EventListener l = null;
if (listenerType == ComponentListener.class) {
l = componentListener;
} else if (listenerType == FocusListener.class) {
l = focusListener;
} else if (listenerType == HierarchyListener.class) {
l = hierarchyListener;
} else if (listenerType == HierarchyBoundsListener.class) {
l = hierarchyBoundsListener;
} else if (listenerType == KeyListener.class) {
l = keyListener;
} else if (listenerType == MouseListener.class) {
l = mouseListener;
} else if (listenerType == MouseMotionListener.class) {
l = mouseMotionListener;
} else if (listenerType == MouseWheelListener.class) {
l = mouseWheelListener;
} else if (listenerType == InputMethodListener.class) {
l = inputMethodListener;
} else if (listenerType == PropertyChangeListener.class) {
return (T[])getPropertyChangeListeners();
}
return AWTEventMulticaster.getListeners(l, listenerType);
}
/**
* Gets the input method request handler which supports
* requests from input methods for this component. A component
* that supports on-the-spot text input must override this
* method to return an <code>InputMethodRequests</code> instance.
* At the same time, it also has to handle input method events.
*
* @return the input method request handler for this component,
* <code>null</code> by default
* @see #addInputMethodListener
* @since 1.2
*/
public InputMethodRequests getInputMethodRequests() {
return null;
}
/**
* Gets the input context used by this component for handling
* the communication with input methods when text is entered
* in this component. By default, the input context used for
* the parent component is returned. Components may
* override this to return a private input context.
*
* @return the input context used by this component;
* <code>null</code> if no context can be determined
* @since 1.2
*/
public InputContext getInputContext() {
Container parent = this.parent;
if (parent == null) {
return null;
} else {
return parent.getInputContext();
}
}
/**
* Enables the events defined by the specified event mask parameter
* to be delivered to this component.
* <p>
* Event types are automatically enabled when a listener for
* that event type is added to the component.
* <p>
* This method only needs to be invoked by subclasses of
* <code>Component</code> which desire to have the specified event
* types delivered to <code>processEvent</code> regardless of whether
* or not a listener is registered.
* @param eventsToEnable the event mask defining the event types
* @see #processEvent
* @see #disableEvents
* @see AWTEvent
* @since JDK1.1
*/
protected final void enableEvents(long eventsToEnable) {
long notifyAncestors = 0;
synchronized (this) {
if ((eventsToEnable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
hierarchyListener == null &&
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0) {
notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK;
}
if ((eventsToEnable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
hierarchyBoundsListener == null &&
(eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0) {
notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK;
}
eventMask |= eventsToEnable;
newEventsOnly = true;
}
// if this is a lightweight component, enable mouse events
// in the native container.
if (peer instanceof LightweightPeer) {
parent.proxyEnableEvents(eventMask);
}
if (notifyAncestors != 0) {
synchronized (getTreeLock()) {
adjustListeningChildrenOnParent(notifyAncestors, 1);
}
}
}
/**
* Disables the events defined by the specified event mask parameter
* from being delivered to this component.
* @param eventsToDisable the event mask defining the event types
* @see #enableEvents
* @since JDK1.1
*/
protected final void disableEvents(long eventsToDisable) {
long notifyAncestors = 0;
synchronized (this) {
if ((eventsToDisable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
hierarchyListener == null &&
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0) {
notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK;
}
if ((eventsToDisable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK)!=0 &&
hierarchyBoundsListener == null &&
(eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0) {
notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK;
}
eventMask &= ~eventsToDisable;
}
if (notifyAncestors != 0) {
synchronized (getTreeLock()) {
adjustListeningChildrenOnParent(notifyAncestors, -1);
}
}
}
transient sun.awt.EventQueueItem[] eventCache;
/**
* @see #isCoalescingEnabled
* @see #checkCoalescing
*/
transient private boolean coalescingEnabled = checkCoalescing();
/**
* Weak map of known coalesceEvent overriders.
* Value indicates whether overriden.
* Bootstrap classes are not included.
*/
private static final Map<Class<?>, Boolean> coalesceMap =
new java.util.WeakHashMap<Class<?>, Boolean>();
/**
* Indicates whether this class overrides coalesceEvents.
* It is assumed that all classes that are loaded from the bootstrap
* do not.
* The boostrap class loader is assumed to be represented by null.
* We do not check that the method really overrides
* (it might be static, private or package private).
*/
private boolean checkCoalescing() {
if (getClass().getClassLoader()==null) {
return false;
}
final Class<? extends Component> clazz = getClass();
synchronized (coalesceMap) {
// Check cache.
Boolean value = coalesceMap.get(clazz);
if (value != null) {
return value;
}
// Need to check non-bootstraps.
Boolean enabled = java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<Boolean>() {
public Boolean run() {
return isCoalesceEventsOverriden(clazz);
}
}
);
coalesceMap.put(clazz, enabled);
return enabled;
}
}
/**
* Parameter types of coalesceEvents(AWTEvent,AWTEVent).
*/
private static final Class[] coalesceEventsParams = {
AWTEvent.class, AWTEvent.class
};
/**
* Indicates whether a class or its superclasses override coalesceEvents.
* Must be called with lock on coalesceMap and privileged.
* @see checkCoalsecing
*/
private static boolean isCoalesceEventsOverriden(Class<?> clazz) {
assert Thread.holdsLock(coalesceMap);
// First check superclass - we may not need to bother ourselves.
Class<?> superclass = clazz.getSuperclass();
if (superclass == null) {
// Only occurs on implementations that
// do not use null to represent the bootsrap class loader.
return false;
}
if (superclass.getClassLoader() != null) {
Boolean value = coalesceMap.get(superclass);
if (value == null) {
// Not done already - recurse.
if (isCoalesceEventsOverriden(superclass)) {
coalesceMap.put(superclass, true);
return true;
}
} else if (value) {
return true;
}
}
try {
// Throws if not overriden.
clazz.getDeclaredMethod(
"coalesceEvents", coalesceEventsParams
);
return true;
} catch (NoSuchMethodException e) {
// Not present in this class.
return false;
}
}
/**
* Indicates whether coalesceEvents may do something.
*/
final boolean isCoalescingEnabled() {
return coalescingEnabled;
}
/**
* Potentially coalesce an event being posted with an existing
* event. This method is called by <code>EventQueue.postEvent</code>
* if an event with the same ID as the event to be posted is found in
* the queue (both events must have this component as their source).
* This method either returns a coalesced event which replaces
* the existing event (and the new event is then discarded), or
* <code>null</code> to indicate that no combining should be done
* (add the second event to the end of the queue). Either event
* parameter may be modified and returned, as the other one is discarded
* unless <code>null</code> is returned.
* <p>
* This implementation of <code>coalesceEvents</code> coalesces
* two event types: mouse move (and drag) events,
* and paint (and update) events.
* For mouse move events the last event is always returned, causing
* intermediate moves to be discarded. For paint events, the new
* event is coalesced into a complex <code>RepaintArea</code> in the peer.
* The new <code>AWTEvent</code> is always returned.
*
* @param existingEvent the event already on the <code>EventQueue</code>
* @param newEvent the event being posted to the
* <code>EventQueue</code>
* @return a coalesced event, or <code>null</code> indicating that no
* coalescing was done
*/
protected AWTEvent coalesceEvents(AWTEvent existingEvent,
AWTEvent newEvent) {
return null;
}
/**
* Processes events occurring on this component. By default this
* method calls the appropriate
* <code>process<event type>Event</code>
* method for the given class of event.
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the event
* @see #processComponentEvent
* @see #processFocusEvent
* @see #processKeyEvent
* @see #processMouseEvent
* @see #processMouseMotionEvent
* @see #processInputMethodEvent
* @see #processHierarchyEvent
* @see #processMouseWheelEvent
* @since JDK1.1
*/
protected void processEvent(AWTEvent e) {
if (e instanceof FocusEvent) {
processFocusEvent((FocusEvent)e);
} else if (e instanceof MouseEvent) {
switch(e.getID()) {
case MouseEvent.MOUSE_PRESSED:
case MouseEvent.MOUSE_RELEASED:
case MouseEvent.MOUSE_CLICKED:
case MouseEvent.MOUSE_ENTERED:
case MouseEvent.MOUSE_EXITED:
processMouseEvent((MouseEvent)e);
break;
case MouseEvent.MOUSE_MOVED:
case MouseEvent.MOUSE_DRAGGED:
processMouseMotionEvent((MouseEvent)e);
break;
case MouseEvent.MOUSE_WHEEL:
processMouseWheelEvent((MouseWheelEvent)e);
break;
}
} else if (e instanceof KeyEvent) {
processKeyEvent((KeyEvent)e);
} else if (e instanceof ComponentEvent) {
processComponentEvent((ComponentEvent)e);
} else if (e instanceof InputMethodEvent) {
processInputMethodEvent((InputMethodEvent)e);
} else if (e instanceof HierarchyEvent) {
switch (e.getID()) {
case HierarchyEvent.HIERARCHY_CHANGED:
processHierarchyEvent((HierarchyEvent)e);
break;
case HierarchyEvent.ANCESTOR_MOVED:
case HierarchyEvent.ANCESTOR_RESIZED:
processHierarchyBoundsEvent((HierarchyEvent)e);
break;
}
}
}
/**
* Processes component events occurring on this component by
* dispatching them to any registered
* <code>ComponentListener</code> objects.
* <p>
* This method is not called unless component events are
* enabled for this component. Component events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>ComponentListener</code> object is registered
* via <code>addComponentListener</code>.
* <li>Component events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the component event
* @see java.awt.event.ComponentEvent
* @see java.awt.event.ComponentListener
* @see #addComponentListener
* @see #enableEvents
* @since JDK1.1
*/
protected void processComponentEvent(ComponentEvent e) {
ComponentListener listener = componentListener;
if (listener != null) {
int id = e.getID();
switch(id) {
case ComponentEvent.COMPONENT_RESIZED:
listener.componentResized(e);
break;
case ComponentEvent.COMPONENT_MOVED:
listener.componentMoved(e);
break;
case ComponentEvent.COMPONENT_SHOWN:
listener.componentShown(e);
break;
case ComponentEvent.COMPONENT_HIDDEN:
listener.componentHidden(e);
break;
}
}
}
/**
* Processes focus events occurring on this component by
* dispatching them to any registered
* <code>FocusListener</code> objects.
* <p>
* This method is not called unless focus events are
* enabled for this component. Focus events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>FocusListener</code> object is registered
* via <code>addFocusListener</code>.
* <li>Focus events are enabled via <code>enableEvents</code>.
* </ul>
* <p>
* If focus events are enabled for a <code>Component</code>,
* the current <code>KeyboardFocusManager</code> determines
* whether or not a focus event should be dispatched to
* registered <code>FocusListener</code> objects. If the
* events are to be dispatched, the <code>KeyboardFocusManager</code>
* calls the <code>Component</code>'s <code>dispatchEvent</code>
* method, which results in a call to the <code>Component</code>'s
* <code>processFocusEvent</code> method.
* <p>
* If focus events are enabled for a <code>Component</code>, calling
* the <code>Component</code>'s <code>dispatchEvent</code> method
* with a <code>FocusEvent</code> as the argument will result in a
* call to the <code>Component</code>'s <code>processFocusEvent</code>
* method regardless of the current <code>KeyboardFocusManager</code>.
*
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the focus event
* @see java.awt.event.FocusEvent
* @see java.awt.event.FocusListener
* @see java.awt.KeyboardFocusManager
* @see #addFocusListener
* @see #enableEvents
* @see #dispatchEvent
* @since JDK1.1
*/
protected void processFocusEvent(FocusEvent e) {
FocusListener listener = focusListener;
if (listener != null) {
int id = e.getID();
switch(id) {
case FocusEvent.FOCUS_GAINED:
listener.focusGained(e);
break;
case FocusEvent.FOCUS_LOST:
listener.focusLost(e);
break;
}
}
}
/**
* Processes key events occurring on this component by
* dispatching them to any registered
* <code>KeyListener</code> objects.
* <p>
* This method is not called unless key events are
* enabled for this component. Key events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>KeyListener</code> object is registered
* via <code>addKeyListener</code>.
* <li>Key events are enabled via <code>enableEvents</code>.
* </ul>
*
* <p>
* If key events are enabled for a <code>Component</code>,
* the current <code>KeyboardFocusManager</code> determines
* whether or not a key event should be dispatched to
* registered <code>KeyListener</code> objects. The
* <code>DefaultKeyboardFocusManager</code> will not dispatch
* key events to a <code>Component</code> that is not the focus
* owner or is not showing.
* <p>
* As of J2SE 1.4, <code>KeyEvent</code>s are redirected to
* the focus owner. Please see the
* <a href="doc-files/FocusSpec.html">Focus Specification</a>
* for further information.
* <p>
* Calling a <code>Component</code>'s <code>dispatchEvent</code>
* method with a <code>KeyEvent</code> as the argument will
* result in a call to the <code>Component</code>'s
* <code>processKeyEvent</code> method regardless of the
* current <code>KeyboardFocusManager</code> as long as the
* component is showing, focused, and enabled, and key events
* are enabled on it.
* <p>If the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the key event
* @see java.awt.event.KeyEvent
* @see java.awt.event.KeyListener
* @see java.awt.KeyboardFocusManager
* @see java.awt.DefaultKeyboardFocusManager
* @see #processEvent
* @see #dispatchEvent
* @see #addKeyListener
* @see #enableEvents
* @see #isShowing
* @since JDK1.1
*/
protected void processKeyEvent(KeyEvent e) {
KeyListener listener = keyListener;
if (listener != null) {
int id = e.getID();
switch(id) {
case KeyEvent.KEY_TYPED:
listener.keyTyped(e);
break;
case KeyEvent.KEY_PRESSED:
listener.keyPressed(e);
break;
case KeyEvent.KEY_RELEASED:
listener.keyReleased(e);
break;
}
}
}
/**
* Processes mouse events occurring on this component by
* dispatching them to any registered
* <code>MouseListener</code> objects.
* <p>
* This method is not called unless mouse events are
* enabled for this component. Mouse events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>MouseListener</code> object is registered
* via <code>addMouseListener</code>.
* <li>Mouse events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the mouse event
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseListener
* @see #addMouseListener
* @see #enableEvents
* @since JDK1.1
*/
protected void processMouseEvent(MouseEvent e) {
MouseListener listener = mouseListener;
if (listener != null) {
int id = e.getID();
switch(id) {
case MouseEvent.MOUSE_PRESSED:
listener.mousePressed(e);
break;
case MouseEvent.MOUSE_RELEASED:
listener.mouseReleased(e);
break;
case MouseEvent.MOUSE_CLICKED:
listener.mouseClicked(e);
break;
case MouseEvent.MOUSE_EXITED:
listener.mouseExited(e);
break;
case MouseEvent.MOUSE_ENTERED:
listener.mouseEntered(e);
break;
}
}
}
/**
* Processes mouse motion events occurring on this component by
* dispatching them to any registered
* <code>MouseMotionListener</code> objects.
* <p>
* This method is not called unless mouse motion events are
* enabled for this component. Mouse motion events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>MouseMotionListener</code> object is registered
* via <code>addMouseMotionListener</code>.
* <li>Mouse motion events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the mouse motion event
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseMotionListener
* @see #addMouseMotionListener
* @see #enableEvents
* @since JDK1.1
*/
protected void processMouseMotionEvent(MouseEvent e) {
MouseMotionListener listener = mouseMotionListener;
if (listener != null) {
int id = e.getID();
switch(id) {
case MouseEvent.MOUSE_MOVED:
listener.mouseMoved(e);
break;
case MouseEvent.MOUSE_DRAGGED:
listener.mouseDragged(e);
break;
}
}
}
/**
* Processes mouse wheel events occurring on this component by
* dispatching them to any registered
* <code>MouseWheelListener</code> objects.
* <p>
* This method is not called unless mouse wheel events are
* enabled for this component. Mouse wheel events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>MouseWheelListener</code> object is registered
* via <code>addMouseWheelListener</code>.
* <li>Mouse wheel events are enabled via <code>enableEvents</code>.
* </ul>
* <p>
* For information on how mouse wheel events are dispatched, see
* the class description for {@link MouseWheelEvent}.
* <p>
* Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the mouse wheel event
* @see java.awt.event.MouseWheelEvent
* @see java.awt.event.MouseWheelListener
* @see #addMouseWheelListener
* @see #enableEvents
* @since 1.4
*/
protected void processMouseWheelEvent(MouseWheelEvent e) {
MouseWheelListener listener = mouseWheelListener;
if (listener != null) {
int id = e.getID();
switch(id) {
case MouseEvent.MOUSE_WHEEL:
listener.mouseWheelMoved(e);
break;
}
}
}
boolean postsOldMouseEvents() {
return false;
}
/**
* Processes input method events occurring on this component by
* dispatching them to any registered
* <code>InputMethodListener</code> objects.
* <p>
* This method is not called unless input method events
* are enabled for this component. Input method events are enabled
* when one of the following occurs:
* <ul>
* <li>An <code>InputMethodListener</code> object is registered
* via <code>addInputMethodListener</code>.
* <li>Input method events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the input method event
* @see java.awt.event.InputMethodEvent
* @see java.awt.event.InputMethodListener
* @see #addInputMethodListener
* @see #enableEvents
* @since 1.2
*/
protected void processInputMethodEvent(InputMethodEvent e) {
InputMethodListener listener = inputMethodListener;
if (listener != null) {
int id = e.getID();
switch (id) {
case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
listener.inputMethodTextChanged(e);
break;
case InputMethodEvent.CARET_POSITION_CHANGED:
listener.caretPositionChanged(e);
break;
}
}
}
/**
* Processes hierarchy events occurring on this component by
* dispatching them to any registered
* <code>HierarchyListener</code> objects.
* <p>
* This method is not called unless hierarchy events
* are enabled for this component. Hierarchy events are enabled
* when one of the following occurs:
* <ul>
* <li>An <code>HierarchyListener</code> object is registered
* via <code>addHierarchyListener</code>.
* <li>Hierarchy events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the hierarchy event
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyListener
* @see #addHierarchyListener
* @see #enableEvents
* @since 1.3
*/
protected void processHierarchyEvent(HierarchyEvent e) {
HierarchyListener listener = hierarchyListener;
if (listener != null) {
int id = e.getID();
switch (id) {
case HierarchyEvent.HIERARCHY_CHANGED:
listener.hierarchyChanged(e);
break;
}
}
}
/**
* Processes hierarchy bounds events occurring on this component by
* dispatching them to any registered
* <code>HierarchyBoundsListener</code> objects.
* <p>
* This method is not called unless hierarchy bounds events
* are enabled for this component. Hierarchy bounds events are enabled
* when one of the following occurs:
* <ul>
* <li>An <code>HierarchyBoundsListener</code> object is registered
* via <code>addHierarchyBoundsListener</code>.
* <li>Hierarchy bounds events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the hierarchy event
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyBoundsListener
* @see #addHierarchyBoundsListener
* @see #enableEvents
* @since 1.3
*/
protected void processHierarchyBoundsEvent(HierarchyEvent e) {
HierarchyBoundsListener listener = hierarchyBoundsListener;
if (listener != null) {
int id = e.getID();
switch (id) {
case HierarchyEvent.ANCESTOR_MOVED:
listener.ancestorMoved(e);
break;
case HierarchyEvent.ANCESTOR_RESIZED:
listener.ancestorResized(e);
break;
}
}
}
/**
* @deprecated As of JDK version 1.1
* replaced by processEvent(AWTEvent).
*/
@Deprecated
public boolean handleEvent(Event evt) {
switch (evt.id) {
case Event.MOUSE_ENTER:
return mouseEnter(evt, evt.x, evt.y);
case Event.MOUSE_EXIT:
return mouseExit(evt, evt.x, evt.y);
case Event.MOUSE_MOVE:
return mouseMove(evt, evt.x, evt.y);
case Event.MOUSE_DOWN:
return mouseDown(evt, evt.x, evt.y);
case Event.MOUSE_DRAG:
return mouseDrag(evt, evt.x, evt.y);
case Event.MOUSE_UP:
return mouseUp(evt, evt.x, evt.y);
case Event.KEY_PRESS:
case Event.KEY_ACTION:
return keyDown(evt, evt.key);
case Event.KEY_RELEASE:
case Event.KEY_ACTION_RELEASE:
return keyUp(evt, evt.key);
case Event.ACTION_EVENT:
return action(evt, evt.arg);
case Event.GOT_FOCUS:
return gotFocus(evt, evt.arg);
case Event.LOST_FOCUS:
return lostFocus(evt, evt.arg);
}
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@Deprecated
public boolean mouseDown(Event evt, int x, int y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseMotionEvent(MouseEvent).
*/
@Deprecated
public boolean mouseDrag(Event evt, int x, int y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@Deprecated
public boolean mouseUp(Event evt, int x, int y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseMotionEvent(MouseEvent).
*/
@Deprecated
public boolean mouseMove(Event evt, int x, int y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@Deprecated
public boolean mouseEnter(Event evt, int x, int y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@Deprecated
public boolean mouseExit(Event evt, int x, int y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processKeyEvent(KeyEvent).
*/
@Deprecated
public boolean keyDown(Event evt, int key) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processKeyEvent(KeyEvent).
*/
@Deprecated
public boolean keyUp(Event evt, int key) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* should register this component as ActionListener on component
* which fires action events.
*/
@Deprecated
public boolean action(Event evt, Object what) {
return false;
}
/**
* Makes this <code>Component</code> displayable by connecting it to a
* native screen resource.
* This method is called internally by the toolkit and should
* not be called directly by programs.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @see #isDisplayable
* @see #removeNotify
* @see #invalidate
* @since JDK1.0
*/
public void addNotify() {
synchronized (getTreeLock()) {
ComponentPeer peer = this.peer;
if (peer == null || peer instanceof LightweightPeer){
if (peer == null) {
// Update both the Component's peer variable and the local
// variable we use for thread safety.
this.peer = peer = getToolkit().createComponent(this);
}
// This is a lightweight component which means it won't be
// able to get window-related events by itself. If any
// have been enabled, then the nearest native container must
// be enabled.
if (parent != null) {
long mask = 0;
if ((mouseListener != null) || ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0)) {
mask |= AWTEvent.MOUSE_EVENT_MASK;
}
if ((mouseMotionListener != null) ||
((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0)) {
mask |= AWTEvent.MOUSE_MOTION_EVENT_MASK;
}
if ((mouseWheelListener != null ) ||
((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0)) {
mask |= AWTEvent.MOUSE_WHEEL_EVENT_MASK;
}
if (focusListener != null || (eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0) {
mask |= AWTEvent.FOCUS_EVENT_MASK;
}
if (keyListener != null || (eventMask & AWTEvent.KEY_EVENT_MASK) != 0) {
mask |= AWTEvent.KEY_EVENT_MASK;
}
if (mask != 0) {
parent.proxyEnableEvents(mask);
}
}
} else {
// It's native. If the parent is lightweight it will need some
// help.
Container parent = getContainer();
if (parent != null && parent.isLightweight()) {
relocateComponent();
if (!parent.isRecursivelyVisibleUpToHeavyweightContainer())
{
peer.setVisible(false);
}
}
}
invalidate();
int npopups = (popups != null? popups.size() : 0);
for (int i = 0 ; i < npopups ; i++) {
PopupMenu popup = popups.elementAt(i);
popup.addNotify();
}
if (dropTarget != null) dropTarget.addNotify(peer);
peerFont = getFont();
if (getContainer() != null && !isAddNotifyComplete) {
getContainer().increaseComponentCount(this);
}
// Update stacking order
updateZOrder();
if (!isAddNotifyComplete) {
mixOnShowing();
}
isAddNotifyComplete = true;
if (hierarchyListener != null ||
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) {
HierarchyEvent e =
new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED,
this, parent,
HierarchyEvent.DISPLAYABILITY_CHANGED |
((isRecursivelyVisible())
? HierarchyEvent.SHOWING_CHANGED
: 0));
dispatchEvent(e);
}
}
}
/**
* Makes this <code>Component</code> undisplayable by destroying it native
* screen resource.
* <p>
* This method is called by the toolkit internally and should
* not be called directly by programs. Code overriding
* this method should call <code>super.removeNotify</code> as
* the first line of the overriding method.
*
* @see #isDisplayable
* @see #addNotify
* @since JDK1.0
*/
public void removeNotify() {
KeyboardFocusManager.clearMostRecentFocusOwner(this);
if (KeyboardFocusManager.getCurrentKeyboardFocusManager().
getPermanentFocusOwner() == this)
{
KeyboardFocusManager.getCurrentKeyboardFocusManager().
setGlobalPermanentFocusOwner(null);
}
synchronized (getTreeLock()) {
clearLightweightDispatcherOnRemove(this);
if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabledFor(this)) {
transferFocus(true);
}
if (getContainer() != null && isAddNotifyComplete) {
getContainer().decreaseComponentCount(this);
}
int npopups = (popups != null? popups.size() : 0);
for (int i = 0 ; i < npopups ; i++) {
PopupMenu popup = popups.elementAt(i);
popup.removeNotify();
}
// If there is any input context for this component, notify
// that this component is being removed. (This has to be done
// before hiding peer.)
if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) {
InputContext inputContext = getInputContext();
if (inputContext != null) {
inputContext.removeNotify(this);
}
}
ComponentPeer p = peer;
if (p != null) {
boolean isLightweight = isLightweight();
if (bufferStrategy instanceof FlipBufferStrategy) {
((FlipBufferStrategy)bufferStrategy).destroyBuffers();
}
if (dropTarget != null) dropTarget.removeNotify(peer);
// Hide peer first to stop system events such as cursor moves.
if (visible) {
p.setVisible(false);
}
peer = null; // Stop peer updates.
peerFont = null;
Toolkit.getEventQueue().removeSourceEvents(this, false);
KeyboardFocusManager.getCurrentKeyboardFocusManager().
discardKeyEvents(this);
p.dispose();
mixOnHiding(isLightweight);
isAddNotifyComplete = false;
// Nullifying compoundShape means that the component has normal shape
// (or has no shape at all).
this.compoundShape = null;
}
if (hierarchyListener != null ||
(eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) {
HierarchyEvent e =
new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED,
this, parent,
HierarchyEvent.DISPLAYABILITY_CHANGED |
((isRecursivelyVisible())
? HierarchyEvent.SHOWING_CHANGED
: 0));
dispatchEvent(e);
}
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processFocusEvent(FocusEvent).
*/
@Deprecated
public boolean gotFocus(Event evt, Object what) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processFocusEvent(FocusEvent).
*/
@Deprecated
public boolean lostFocus(Event evt, Object what) {
return false;
}
/**
* Returns whether this <code>Component</code> can become the focus
* owner.
*
* @return <code>true</code> if this <code>Component</code> is
* focusable; <code>false</code> otherwise
* @see #setFocusable
* @since JDK1.1
* @deprecated As of 1.4, replaced by <code>isFocusable()</code>.
*/
@Deprecated
public boolean isFocusTraversable() {
if (isFocusTraversableOverridden == FOCUS_TRAVERSABLE_UNKNOWN) {
isFocusTraversableOverridden = FOCUS_TRAVERSABLE_DEFAULT;
}
return focusable;
}
/**
* Returns whether this Component can be focused.
*
* @return <code>true</code> if this Component is focusable;
* <code>false</code> otherwise.
* @see #setFocusable
* @since 1.4
*/
public boolean isFocusable() {
return isFocusTraversable();
}
/**
* Sets the focusable state of this Component to the specified value. This
* value overrides the Component's default focusability.
*
* @param focusable indicates whether this Component is focusable
* @see #isFocusable
* @since 1.4
* @beaninfo
* bound: true
*/
public void setFocusable(boolean focusable) {
boolean oldFocusable;
synchronized (this) {
oldFocusable = this.focusable;
this.focusable = focusable;
}
isFocusTraversableOverridden = FOCUS_TRAVERSABLE_SET;
firePropertyChange("focusable", oldFocusable, focusable);
if (oldFocusable && !focusable) {
if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabled()) {
transferFocus(true);
}
KeyboardFocusManager.clearMostRecentFocusOwner(this);
}
}
final boolean isFocusTraversableOverridden() {
return (isFocusTraversableOverridden != FOCUS_TRAVERSABLE_DEFAULT);
}
/**
* Sets the focus traversal keys for a given traversal operation for this
* Component.
* <p>
* The default values for a Component's focus traversal keys are
* implementation-dependent. Sun recommends that all implementations for a
* particular native platform use the same default values. The
* recommendations for Windows and Unix are listed below. These
* recommendations are used in the Sun AWT implementations.
*
* <table border=1 summary="Recommended default values for a Component's focus traversal keys">
* <tr>
* <th>Identifier</th>
* <th>Meaning</th>
* <th>Default</th>
* </tr>
* <tr>
* <td>KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS</td>
* <td>Normal forward keyboard traversal</td>
* <td>TAB on KEY_PRESSED, CTRL-TAB on KEY_PRESSED</td>
* </tr>
* <tr>
* <td>KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS</td>
* <td>Normal reverse keyboard traversal</td>
* <td>SHIFT-TAB on KEY_PRESSED, CTRL-SHIFT-TAB on KEY_PRESSED</td>
* </tr>
* <tr>
* <td>KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS</td>
* <td>Go up one focus traversal cycle</td>
* <td>none</td>
* </tr>
* </table>
*
* To disable a traversal key, use an empty Set; Collections.EMPTY_SET is
* recommended.
* <p>
* Using the AWTKeyStroke API, client code can specify on which of two
* specific KeyEvents, KEY_PRESSED or KEY_RELEASED, the focus traversal
* operation will occur. Regardless of which KeyEvent is specified,
* however, all KeyEvents related to the focus traversal key, including the
* associated KEY_TYPED event, will be consumed, and will not be dispatched
* to any Component. It is a runtime error to specify a KEY_TYPED event as
* mapping to a focus traversal operation, or to map the same event to
* multiple default focus traversal operations.
* <p>
* If a value of null is specified for the Set, this Component inherits the
* Set from its parent. If all ancestors of this Component have null
* specified for the Set, then the current KeyboardFocusManager's default
* Set is used.
* <p>
* This method may throw a {@code ClassCastException} if any {@code Object}
* in {@code keystrokes} is not an {@code AWTKeyStroke}.
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @param keystrokes the Set of AWTKeyStroke for the specified operation
* @see #getFocusTraversalKeys
* @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or if keystrokes
* contains null, or if any keystroke represents a KEY_TYPED event,
* or if any keystroke already maps to another focus traversal
* operation for this Component
* @since 1.4
* @beaninfo
* bound: true
*/
public void setFocusTraversalKeys(int id,
Set<? extends AWTKeyStroke> keystrokes)
{
if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
throw new IllegalArgumentException("invalid focus traversal key identifier");
}
setFocusTraversalKeys_NoIDCheck(id, keystrokes);
}
/**
* Returns the Set of focus traversal keys for a given traversal operation
* for this Component. (See
* <code>setFocusTraversalKeys</code> for a full description of each key.)
* <p>
* If a Set of traversal keys has not been explicitly defined for this
* Component, then this Component's parent's Set is returned. If no Set
* has been explicitly defined for any of this Component's ancestors, then
* the current KeyboardFocusManager's default Set is returned.
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @return the Set of AWTKeyStrokes for the specified operation. The Set
* will be unmodifiable, and may be empty. null will never be
* returned.
* @see #setFocusTraversalKeys
* @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @since 1.4
*/
public Set<AWTKeyStroke> getFocusTraversalKeys(int id) {
if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
throw new IllegalArgumentException("invalid focus traversal key identifier");
}
return getFocusTraversalKeys_NoIDCheck(id);
}
// We define these methods so that Container does not need to repeat this
// code. Container cannot call super.<method> because Container allows
// DOWN_CYCLE_TRAVERSAL_KEY while Component does not. The Component method
// would erroneously generate an IllegalArgumentException for
// DOWN_CYCLE_TRAVERSAL_KEY.
final void setFocusTraversalKeys_NoIDCheck(int id, Set<? extends AWTKeyStroke> keystrokes) {
Set<AWTKeyStroke> oldKeys;
synchronized (this) {
if (focusTraversalKeys == null) {
initializeFocusTraversalKeys();
}
if (keystrokes != null) {
for (AWTKeyStroke keystroke : keystrokes ) {
if (keystroke == null) {
throw new IllegalArgumentException("cannot set null focus traversal key");
}
if (keystroke.getKeyChar() != KeyEvent.CHAR_UNDEFINED) {
throw new IllegalArgumentException("focus traversal keys cannot map to KEY_TYPED events");
}
for (int i = 0; i < focusTraversalKeys.length; i++) {
if (i == id) {
continue;
}
if (getFocusTraversalKeys_NoIDCheck(i).contains(keystroke))
{
throw new IllegalArgumentException("focus traversal keys must be unique for a Component");
}
}
}
}
oldKeys = focusTraversalKeys[id];
focusTraversalKeys[id] = (keystrokes != null)
? Collections.unmodifiableSet(new HashSet<AWTKeyStroke>(keystrokes))
: null;
}
firePropertyChange(focusTraversalKeyPropertyNames[id], oldKeys,
keystrokes);
}
final Set<AWTKeyStroke> getFocusTraversalKeys_NoIDCheck(int id) {
// Okay to return Set directly because it is an unmodifiable view
@SuppressWarnings("unchecked")
Set<AWTKeyStroke> keystrokes = (focusTraversalKeys != null)
? focusTraversalKeys[id]
: null;
if (keystrokes != null) {
return keystrokes;
} else {
Container parent = this.parent;
if (parent != null) {
return parent.getFocusTraversalKeys(id);
} else {
return KeyboardFocusManager.getCurrentKeyboardFocusManager().
getDefaultFocusTraversalKeys(id);
}
}
}
/**
* Returns whether the Set of focus traversal keys for the given focus
* traversal operation has been explicitly defined for this Component. If
* this method returns <code>false</code>, this Component is inheriting the
* Set from an ancestor, or from the current KeyboardFocusManager.
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @return <code>true</code> if the the Set of focus traversal keys for the
* given focus traversal operation has been explicitly defined for
* this Component; <code>false</code> otherwise.
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @since 1.4
*/
public boolean areFocusTraversalKeysSet(int id) {
if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
throw new IllegalArgumentException("invalid focus traversal key identifier");
}
return (focusTraversalKeys != null && focusTraversalKeys[id] != null);
}
/**
* Sets whether focus traversal keys are enabled for this Component.
* Components for which focus traversal keys are disabled receive key
* events for focus traversal keys. Components for which focus traversal
* keys are enabled do not see these events; instead, the events are
* automatically converted to traversal operations.
*
* @param focusTraversalKeysEnabled whether focus traversal keys are
* enabled for this Component
* @see #getFocusTraversalKeysEnabled
* @see #setFocusTraversalKeys
* @see #getFocusTraversalKeys
* @since 1.4
* @beaninfo
* bound: true
*/
public void setFocusTraversalKeysEnabled(boolean
focusTraversalKeysEnabled) {
boolean oldFocusTraversalKeysEnabled;
synchronized (this) {
oldFocusTraversalKeysEnabled = this.focusTraversalKeysEnabled;
this.focusTraversalKeysEnabled = focusTraversalKeysEnabled;
}
firePropertyChange("focusTraversalKeysEnabled",
oldFocusTraversalKeysEnabled,
focusTraversalKeysEnabled);
}
/**
* Returns whether focus traversal keys are enabled for this Component.
* Components for which focus traversal keys are disabled receive key
* events for focus traversal keys. Components for which focus traversal
* keys are enabled do not see these events; instead, the events are
* automatically converted to traversal operations.
*
* @return whether focus traversal keys are enabled for this Component
* @see #setFocusTraversalKeysEnabled
* @see #setFocusTraversalKeys
* @see #getFocusTraversalKeys
* @since 1.4
*/
public boolean getFocusTraversalKeysEnabled() {
return focusTraversalKeysEnabled;
}
/**
* Requests that this Component get the input focus, and that this
* Component's top-level ancestor become the focused Window. This
* component must be displayable, focusable, visible and all of
* its ancestors (with the exception of the top-level Window) must
* be visible for the request to be granted. Every effort will be
* made to honor the request; however, in some cases it may be
* impossible to do so. Developers must never assume that this
* Component is the focus owner until this Component receives a
* FOCUS_GAINED event. If this request is denied because this
* Component's top-level Window cannot become the focused Window,
* the request will be remembered and will be granted when the
* Window is later focused by the user.
* <p>
* This method cannot be used to set the focus owner to no Component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code>
* instead.
* <p>
* Because the focus behavior of this method is platform-dependent,
* developers are strongly encouraged to use
* <code>requestFocusInWindow</code> when possible.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @see #requestFocusInWindow
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since JDK1.0
*/
public void requestFocus() {
requestFocusHelper(false, true);
}
boolean requestFocus(CausedFocusEvent.Cause cause) {
return requestFocusHelper(false, true, cause);
}
/**
* Requests that this <code>Component</code> get the input focus,
* and that this <code>Component</code>'s top-level ancestor
* become the focused <code>Window</code>. This component must be
* displayable, focusable, visible and all of its ancestors (with
* the exception of the top-level Window) must be visible for the
* request to be granted. Every effort will be made to honor the
* request; however, in some cases it may be impossible to do
* so. Developers must never assume that this component is the
* focus owner until this component receives a FOCUS_GAINED
* event. If this request is denied because this component's
* top-level window cannot become the focused window, the request
* will be remembered and will be granted when the window is later
* focused by the user.
* <p>
* This method returns a boolean value. If <code>false</code> is returned,
* the request is <b>guaranteed to fail</b>. If <code>true</code> is
* returned, the request will succeed <b>unless</b> it is vetoed, or an
* extraordinary event, such as disposal of the component's peer, occurs
* before the request can be granted by the native windowing system. Again,
* while a return value of <code>true</code> indicates that the request is
* likely to succeed, developers must never assume that this component is
* the focus owner until this component receives a FOCUS_GAINED event.
* <p>
* This method cannot be used to set the focus owner to no component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code>
* instead.
* <p>
* Because the focus behavior of this method is platform-dependent,
* developers are strongly encouraged to use
* <code>requestFocusInWindow</code> when possible.
* <p>
* Every effort will be made to ensure that <code>FocusEvent</code>s
* generated as a
* result of this request will have the specified temporary value. However,
* because specifying an arbitrary temporary state may not be implementable
* on all native windowing systems, correct behavior for this method can be
* guaranteed only for lightweight <code>Component</code>s.
* This method is not intended
* for general use, but exists instead as a hook for lightweight component
* libraries, such as Swing.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @param temporary true if the focus change is temporary,
* such as when the window loses the focus; for
* more information on temporary focus changes see the
*<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* @return <code>false</code> if the focus change request is guaranteed to
* fail; <code>true</code> if it is likely to succeed
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since 1.4
*/
protected boolean requestFocus(boolean temporary) {
return requestFocusHelper(temporary, true);
}
boolean requestFocus(boolean temporary, CausedFocusEvent.Cause cause) {
return requestFocusHelper(temporary, true, cause);
}
/**
* Requests that this Component get the input focus, if this
* Component's top-level ancestor is already the focused
* Window. This component must be displayable, focusable, visible
* and all of its ancestors (with the exception of the top-level
* Window) must be visible for the request to be granted. Every
* effort will be made to honor the request; however, in some
* cases it may be impossible to do so. Developers must never
* assume that this Component is the focus owner until this
* Component receives a FOCUS_GAINED event.
* <p>
* This method returns a boolean value. If <code>false</code> is returned,
* the request is <b>guaranteed to fail</b>. If <code>true</code> is
* returned, the request will succeed <b>unless</b> it is vetoed, or an
* extraordinary event, such as disposal of the Component's peer, occurs
* before the request can be granted by the native windowing system. Again,
* while a return value of <code>true</code> indicates that the request is
* likely to succeed, developers must never assume that this Component is
* the focus owner until this Component receives a FOCUS_GAINED event.
* <p>
* This method cannot be used to set the focus owner to no Component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code>
* instead.
* <p>
* The focus behavior of this method can be implemented uniformly across
* platforms, and thus developers are strongly encouraged to use this
* method over <code>requestFocus</code> when possible. Code which relies
* on <code>requestFocus</code> may exhibit different focus behavior on
* different platforms.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @return <code>false</code> if the focus change request is guaranteed to
* fail; <code>true</code> if it is likely to succeed
* @see #requestFocus
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since 1.4
*/
public boolean requestFocusInWindow() {
return requestFocusHelper(false, false);
}
boolean requestFocusInWindow(CausedFocusEvent.Cause cause) {
return requestFocusHelper(false, false, cause);
}
/**
* Requests that this <code>Component</code> get the input focus,
* if this <code>Component</code>'s top-level ancestor is already
* the focused <code>Window</code>. This component must be
* displayable, focusable, visible and all of its ancestors (with
* the exception of the top-level Window) must be visible for the
* request to be granted. Every effort will be made to honor the
* request; however, in some cases it may be impossible to do
* so. Developers must never assume that this component is the
* focus owner until this component receives a FOCUS_GAINED event.
* <p>
* This method returns a boolean value. If <code>false</code> is returned,
* the request is <b>guaranteed to fail</b>. If <code>true</code> is
* returned, the request will succeed <b>unless</b> it is vetoed, or an
* extraordinary event, such as disposal of the component's peer, occurs
* before the request can be granted by the native windowing system. Again,
* while a return value of <code>true</code> indicates that the request is
* likely to succeed, developers must never assume that this component is
* the focus owner until this component receives a FOCUS_GAINED event.
* <p>
* This method cannot be used to set the focus owner to no component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code>
* instead.
* <p>
* The focus behavior of this method can be implemented uniformly across
* platforms, and thus developers are strongly encouraged to use this
* method over <code>requestFocus</code> when possible. Code which relies
* on <code>requestFocus</code> may exhibit different focus behavior on
* different platforms.
* <p>
* Every effort will be made to ensure that <code>FocusEvent</code>s
* generated as a
* result of this request will have the specified temporary value. However,
* because specifying an arbitrary temporary state may not be implementable
* on all native windowing systems, correct behavior for this method can be
* guaranteed only for lightweight components. This method is not intended
* for general use, but exists instead as a hook for lightweight component
* libraries, such as Swing.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @param temporary true if the focus change is temporary,
* such as when the window loses the focus; for
* more information on temporary focus changes see the
*<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* @return <code>false</code> if the focus change request is guaranteed to
* fail; <code>true</code> if it is likely to succeed
* @see #requestFocus
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since 1.4
*/
protected boolean requestFocusInWindow(boolean temporary) {
return requestFocusHelper(temporary, false);
}
boolean requestFocusInWindow(boolean temporary, CausedFocusEvent.Cause cause) {
return requestFocusHelper(temporary, false, cause);
}
final boolean requestFocusHelper(boolean temporary,
boolean focusedWindowChangeAllowed) {
return requestFocusHelper(temporary, focusedWindowChangeAllowed, CausedFocusEvent.Cause.UNKNOWN);
}
final boolean requestFocusHelper(boolean temporary,
boolean focusedWindowChangeAllowed,
CausedFocusEvent.Cause cause)
{
// 1) Check if the event being dispatched is a system-generated mouse event.
AWTEvent currentEvent = EventQueue.getCurrentEvent();
if (currentEvent instanceof MouseEvent &&
SunToolkit.isSystemGenerated(currentEvent))
{
// 2) Sanity check: if the mouse event component source belongs to the same containing window.
Component source = ((MouseEvent)currentEvent).getComponent();
if (source == null || source.getContainingWindow() == getContainingWindow()) {
focusLog.finest("requesting focus by mouse event \"in window\"");
// If both the conditions are fulfilled the focus request should be strictly
// bounded by the toplevel window. It's assumed that the mouse event activates
// the window (if it wasn't active) and this makes it possible for a focus
// request with a strong in-window requirement to change focus in the bounds
// of the toplevel. If, by any means, due to asynchronous nature of the event
// dispatching mechanism, the window happens to be natively inactive by the time
// this focus request is eventually handled, it should not re-activate the
// toplevel. Otherwise the result may not meet user expectations. See 6981400.
focusedWindowChangeAllowed = false;
}
}
if (!isRequestFocusAccepted(temporary, focusedWindowChangeAllowed, cause)) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("requestFocus is not accepted");
}
return false;
}
// Update most-recent map
KeyboardFocusManager.setMostRecentFocusOwner(this);
Component window = this;
while ( (window != null) && !(window instanceof Window)) {
if (!window.isVisible()) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("component is recurively invisible");
}
return false;
}
window = window.parent;
}
ComponentPeer peer = this.peer;
Component heavyweight = (peer instanceof LightweightPeer)
? getNativeContainer() : this;
if (heavyweight == null || !heavyweight.isVisible()) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Component is not a part of visible hierarchy");
}
return false;
}
peer = heavyweight.peer;
if (peer == null) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Peer is null");
}
return false;
}
// Focus this Component
long time = 0;
if (EventQueue.isDispatchThread()) {
time = Toolkit.getEventQueue().getMostRecentKeyEventTime();
} else {
// A focus request made from outside EDT should not be associated with any event
// and so its time stamp is simply set to the current time.
time = System.currentTimeMillis();
}
boolean success = peer.requestFocus
(this, temporary, focusedWindowChangeAllowed, time, cause);
if (!success) {
KeyboardFocusManager.getCurrentKeyboardFocusManager
(appContext).dequeueKeyEvents(time, this);
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Peer request failed");
}
} else {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Pass for " + this);
}
}
return success;
}
private boolean isRequestFocusAccepted(boolean temporary,
boolean focusedWindowChangeAllowed,
CausedFocusEvent.Cause cause)
{
if (!isFocusable() || !isVisible()) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Not focusable or not visible");
}
return false;
}
ComponentPeer peer = this.peer;
if (peer == null) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("peer is null");
}
return false;
}
Window window = getContainingWindow();
if (window == null || !window.isFocusableWindow()) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Component doesn't have toplevel");
}
return false;
}
// We have passed all regular checks for focus request,
// now let's call RequestFocusController and see what it says.
Component focusOwner = KeyboardFocusManager.getMostRecentFocusOwner(window);
if (focusOwner == null) {
// sometimes most recent focus owner may be null, but focus owner is not
// e.g. we reset most recent focus owner if user removes focus owner
focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
if (focusOwner != null && focusOwner.getContainingWindow() != window) {
focusOwner = null;
}
}
if (focusOwner == this || focusOwner == null) {
// Controller is supposed to verify focus transfers and for this it
// should know both from and to components. And it shouldn't verify
// transfers from when these components are equal.
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("focus owner is null or this");
}
return true;
}
if (CausedFocusEvent.Cause.ACTIVATION == cause) {
// we shouldn't call RequestFocusController in case we are
// in activation. We do request focus on component which
// has got temporary focus lost and then on component which is
// most recent focus owner. But most recent focus owner can be
// changed by requestFocsuXXX() call only, so this transfer has
// been already approved.
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("cause is activation");
}
return true;
}
boolean ret = Component.requestFocusController.acceptRequestFocus(focusOwner,
this,
temporary,
focusedWindowChangeAllowed,
cause);
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("RequestFocusController returns {0}", ret);
}
return ret;
}
private static RequestFocusController requestFocusController = new DummyRequestFocusController();
// Swing access this method through reflection to implement InputVerifier's functionality.
// Perhaps, we should make this method public (later ;)
private static class DummyRequestFocusController implements RequestFocusController {
public boolean acceptRequestFocus(Component from, Component to,
boolean temporary, boolean focusedWindowChangeAllowed,
CausedFocusEvent.Cause cause)
{
return true;
}
};
synchronized static void setRequestFocusController(RequestFocusController requestController)
{
if (requestController == null) {
requestFocusController = new DummyRequestFocusController();
} else {
requestFocusController = requestController;
}
}
/**
* Returns the Container which is the focus cycle root of this Component's
* focus traversal cycle. Each focus traversal cycle has only a single
* focus cycle root and each Component which is not a Container belongs to
* only a single focus traversal cycle. Containers which are focus cycle
* roots belong to two cycles: one rooted at the Container itself, and one
* rooted at the Container's nearest focus-cycle-root ancestor. For such
* Containers, this method will return the Container's nearest focus-cycle-
* root ancestor.
*
* @return this Component's nearest focus-cycle-root ancestor
* @see Container#isFocusCycleRoot()
* @since 1.4
*/
public Container getFocusCycleRootAncestor() {
Container rootAncestor = this.parent;
while (rootAncestor != null && !rootAncestor.isFocusCycleRoot()) {
rootAncestor = rootAncestor.parent;
}
return rootAncestor;
}
/**
* Returns whether the specified Container is the focus cycle root of this
* Component's focus traversal cycle. Each focus traversal cycle has only
* a single focus cycle root and each Component which is not a Container
* belongs to only a single focus traversal cycle.
*
* @param container the Container to be tested
* @return <code>true</code> if the specified Container is a focus-cycle-
* root of this Component; <code>false</code> otherwise
* @see Container#isFocusCycleRoot()
* @since 1.4
*/
public boolean isFocusCycleRoot(Container container) {
Container rootAncestor = getFocusCycleRootAncestor();
return (rootAncestor == container);
}
Container getTraversalRoot() {
return getFocusCycleRootAncestor();
}
/**
* Transfers the focus to the next component, as though this Component were
* the focus owner.
* @see #requestFocus()
* @since JDK1.1
*/
public void transferFocus() {
nextFocus();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by transferFocus().
*/
@Deprecated
public void nextFocus() {
transferFocus(false);
}
boolean transferFocus(boolean clearOnFailure) {
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("clearOnFailure = " + clearOnFailure);
}
Component toFocus = getNextFocusCandidate();
boolean res = false;
if (toFocus != null && !toFocus.isFocusOwner() && toFocus != this) {
res = toFocus.requestFocusInWindow(CausedFocusEvent.Cause.TRAVERSAL_FORWARD);
}
if (clearOnFailure && !res) {
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("clear global focus owner");
}
KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv();
}
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("returning result: " + res);
}
return res;
}
final Component getNextFocusCandidate() {
Container rootAncestor = getTraversalRoot();
Component comp = this;
while (rootAncestor != null &&
!(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner()))
{
comp = rootAncestor;
rootAncestor = comp.getFocusCycleRootAncestor();
}
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("comp = " + comp + ", root = " + rootAncestor);
}
Component candidate = null;
if (rootAncestor != null) {
FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
Component toFocus = policy.getComponentAfter(rootAncestor, comp);
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("component after is " + toFocus);
}
if (toFocus == null) {
toFocus = policy.getDefaultComponent(rootAncestor);
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("default component is " + toFocus);
}
}
if (toFocus == null) {
Applet applet = EmbeddedFrame.getAppletIfAncestorOf(this);
if (applet != null) {
toFocus = applet;
}
}
candidate = toFocus;
}
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("Focus transfer candidate: " + candidate);
}
return candidate;
}
/**
* Transfers the focus to the previous component, as though this Component
* were the focus owner.
* @see #requestFocus()
* @since 1.4
*/
public void transferFocusBackward() {
transferFocusBackward(false);
}
boolean transferFocusBackward(boolean clearOnFailure) {
Container rootAncestor = getTraversalRoot();
Component comp = this;
while (rootAncestor != null &&
!(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner()))
{
comp = rootAncestor;
rootAncestor = comp.getFocusCycleRootAncestor();
}
boolean res = false;
if (rootAncestor != null) {
FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
Component toFocus = policy.getComponentBefore(rootAncestor, comp);
if (toFocus == null) {
toFocus = policy.getDefaultComponent(rootAncestor);
}
if (toFocus != null) {
res = toFocus.requestFocusInWindow(CausedFocusEvent.Cause.TRAVERSAL_BACKWARD);
}
}
if (clearOnFailure && !res) {
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("clear global focus owner");
}
KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv();
}
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("returning result: " + res);
}
return res;
}
/**
* Transfers the focus up one focus traversal cycle. Typically, the focus
* owner is set to this Component's focus cycle root, and the current focus
* cycle root is set to the new focus owner's focus cycle root. If,
* however, this Component's focus cycle root is a Window, then the focus
* owner is set to the focus cycle root's default Component to focus, and
* the current focus cycle root is unchanged.
*
* @see #requestFocus()
* @see Container#isFocusCycleRoot()
* @see Container#setFocusCycleRoot(boolean)
* @since 1.4
*/
public void transferFocusUpCycle() {
Container rootAncestor;
for (rootAncestor = getFocusCycleRootAncestor();
rootAncestor != null && !(rootAncestor.isShowing() &&
rootAncestor.isFocusable() &&
rootAncestor.isEnabled());
rootAncestor = rootAncestor.getFocusCycleRootAncestor()) {
}
if (rootAncestor != null) {
Container rootAncestorRootAncestor =
rootAncestor.getFocusCycleRootAncestor();
Container fcr = (rootAncestorRootAncestor != null) ?
rootAncestorRootAncestor : rootAncestor;
KeyboardFocusManager.getCurrentKeyboardFocusManager().
setGlobalCurrentFocusCycleRootPriv(fcr);
rootAncestor.requestFocus(CausedFocusEvent.Cause.TRAVERSAL_UP);
} else {
Window window = getContainingWindow();
if (window != null) {
Component toFocus = window.getFocusTraversalPolicy().
getDefaultComponent(window);
if (toFocus != null) {
KeyboardFocusManager.getCurrentKeyboardFocusManager().
setGlobalCurrentFocusCycleRootPriv(window);
toFocus.requestFocus(CausedFocusEvent.Cause.TRAVERSAL_UP);
}
}
}
}
/**
* Returns <code>true</code> if this <code>Component</code> is the
* focus owner. This method is obsolete, and has been replaced by
* <code>isFocusOwner()</code>.
*
* @return <code>true</code> if this <code>Component</code> is the
* focus owner; <code>false</code> otherwise
* @since 1.2
*/
public boolean hasFocus() {
return (KeyboardFocusManager.getCurrentKeyboardFocusManager().
getFocusOwner() == this);
}
/**
* Returns <code>true</code> if this <code>Component</code> is the
* focus owner.
*
* @return <code>true</code> if this <code>Component</code> is the
* focus owner; <code>false</code> otherwise
* @since 1.4
*/
public boolean isFocusOwner() {
return hasFocus();
}
/*
* Used to disallow auto-focus-transfer on disposal of the focus owner
* in the process of disposing its parent container.
*/
private boolean autoFocusTransferOnDisposal = true;
void setAutoFocusTransferOnDisposal(boolean value) {
autoFocusTransferOnDisposal = value;
}
boolean isAutoFocusTransferOnDisposal() {
return autoFocusTransferOnDisposal;
}
/**
* Adds the specified popup menu to the component.
* @param popup the popup menu to be added to the component.
* @see #remove(MenuComponent)
* @exception NullPointerException if {@code popup} is {@code null}
* @since JDK1.1
*/
public void add(PopupMenu popup) {
synchronized (getTreeLock()) {
if (popup.parent != null) {
popup.parent.remove(popup);
}
if (popups == null) {
popups = new Vector<PopupMenu>();
}
popups.addElement(popup);
popup.parent = this;
if (peer != null) {
if (popup.peer == null) {
popup.addNotify();
}
}
}
}
/**
* Removes the specified popup menu from the component.
* @param popup the popup menu to be removed
* @see #add(PopupMenu)
* @since JDK1.1
*/
@SuppressWarnings("unchecked")
public void remove(MenuComponent popup) {
synchronized (getTreeLock()) {
if (popups == null) {
return;
}
int index = popups.indexOf(popup);
if (index >= 0) {
PopupMenu pmenu = (PopupMenu)popup;
if (pmenu.peer != null) {
pmenu.removeNotify();
}
pmenu.parent = null;
popups.removeElementAt(index);
if (popups.size() == 0) {
popups = null;
}
}
}
}
/**
* Returns a string representing the state of this component. This
* method is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not be
* <code>null</code>.
*
* @return a string representation of this component's state
* @since JDK1.0
*/
protected String paramString() {
final String thisName = Objects.toString(getName(), "");
final String invalid = isValid() ? "" : ",invalid";
final String hidden = visible ? "" : ",hidden";
final String disabled = enabled ? "" : ",disabled";
return thisName + ',' + x + ',' + y + ',' + width + 'x' + height
+ invalid + hidden + disabled;
}
/**
* Returns a string representation of this component and its values.
* @return a string representation of this component
* @since JDK1.0
*/
public String toString() {
return getClass().getName() + '[' + paramString() + ']';
}
/**
* Prints a listing of this component to the standard system output
* stream <code>System.out</code>.
* @see java.lang.System#out
* @since JDK1.0
*/
public void list() {
list(System.out, 0);
}
/**
* Prints a listing of this component to the specified output
* stream.
* @param out a print stream
* @throws NullPointerException if {@code out} is {@code null}
* @since JDK1.0
*/
public void list(PrintStream out) {
list(out, 0);
}
/**
* Prints out a list, starting at the specified indentation, to the
* specified print stream.
* @param out a print stream
* @param indent number of spaces to indent
* @see java.io.PrintStream#println(java.lang.Object)
* @throws NullPointerException if {@code out} is {@code null}
* @since JDK1.0
*/
public void list(PrintStream out, int indent) {
for (int i = 0 ; i < indent ; i++) {
out.print(" ");
}
out.println(this);
}
/**
* Prints a listing to the specified print writer.
* @param out the print writer to print to
* @throws NullPointerException if {@code out} is {@code null}
* @since JDK1.1
*/
public void list(PrintWriter out) {
list(out, 0);
}
/**
* Prints out a list, starting at the specified indentation, to
* the specified print writer.
* @param out the print writer to print to
* @param indent the number of spaces to indent
* @throws NullPointerException if {@code out} is {@code null}
* @see java.io.PrintStream#println(java.lang.Object)
* @since JDK1.1
*/
public void list(PrintWriter out, int indent) {
for (int i = 0 ; i < indent ; i++) {
out.print(" ");
}
out.println(this);
}
/*
* Fetches the native container somewhere higher up in the component
* tree that contains this component.
*/
final Container getNativeContainer() {
Container p = getContainer();
while (p != null && p.peer instanceof LightweightPeer) {
p = p.getContainer();
}
return p;
}
/**
* Adds a PropertyChangeListener to the listener list. The listener is
* registered for all bound properties of this class, including the
* following:
* <ul>
* <li>this Component's font ("font")</li>
* <li>this Component's background color ("background")</li>
* <li>this Component's foreground color ("foreground")</li>
* <li>this Component's focusability ("focusable")</li>
* <li>this Component's focus traversal keys enabled state
* ("focusTraversalKeysEnabled")</li>
* <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
* ("forwardFocusTraversalKeys")</li>
* <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
* ("backwardFocusTraversalKeys")</li>
* <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
* ("upCycleFocusTraversalKeys")</li>
* <li>this Component's preferred size ("preferredSize")</li>
* <li>this Component's minimum size ("minimumSize")</li>
* <li>this Component's maximum size ("maximumSize")</li>
* <li>this Component's name ("name")</li>
* </ul>
* Note that if this <code>Component</code> is inheriting a bound property, then no
* event will be fired in response to a change in the inherited property.
* <p>
* If <code>listener</code> is <code>null</code>,
* no exception is thrown and no action is performed.
*
* @param listener the property change listener to be added
*
* @see #removePropertyChangeListener
* @see #getPropertyChangeListeners
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
*/
public void addPropertyChangeListener(
PropertyChangeListener listener) {
synchronized (getObjectLock()) {
if (listener == null) {
return;
}
if (changeSupport == null) {
changeSupport = new PropertyChangeSupport(this);
}
changeSupport.addPropertyChangeListener(listener);
}
}
/**
* Removes a PropertyChangeListener from the listener list. This method
* should be used to remove PropertyChangeListeners that were registered
* for all bound properties of this class.
* <p>
* If listener is null, no exception is thrown and no action is performed.
*
* @param listener the PropertyChangeListener to be removed
*
* @see #addPropertyChangeListener
* @see #getPropertyChangeListeners
* @see #removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
*/
public void removePropertyChangeListener(
PropertyChangeListener listener) {
synchronized (getObjectLock()) {
if (listener == null || changeSupport == null) {
return;
}
changeSupport.removePropertyChangeListener(listener);
}
}
/**
* Returns an array of all the property change listeners
* registered on this component.
*
* @return all of this component's <code>PropertyChangeListener</code>s
* or an empty array if no property change
* listeners are currently registered
*
* @see #addPropertyChangeListener
* @see #removePropertyChangeListener
* @see #getPropertyChangeListeners(java.lang.String)
* @see java.beans.PropertyChangeSupport#getPropertyChangeListeners
* @since 1.4
*/
public PropertyChangeListener[] getPropertyChangeListeners() {
synchronized (getObjectLock()) {
if (changeSupport == null) {
return new PropertyChangeListener[0];
}
return changeSupport.getPropertyChangeListeners();
}
}
/**
* Adds a PropertyChangeListener to the listener list for a specific
* property. The specified property may be user-defined, or one of the
* following:
* <ul>
* <li>this Component's font ("font")</li>
* <li>this Component's background color ("background")</li>
* <li>this Component's foreground color ("foreground")</li>
* <li>this Component's focusability ("focusable")</li>
* <li>this Component's focus traversal keys enabled state
* ("focusTraversalKeysEnabled")</li>
* <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
* ("forwardFocusTraversalKeys")</li>
* <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
* ("backwardFocusTraversalKeys")</li>
* <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
* ("upCycleFocusTraversalKeys")</li>
* </ul>
* Note that if this <code>Component</code> is inheriting a bound property, then no
* event will be fired in response to a change in the inherited property.
* <p>
* If <code>propertyName</code> or <code>listener</code> is <code>null</code>,
* no exception is thrown and no action is taken.
*
* @param propertyName one of the property names listed above
* @param listener the property change listener to be added
*
* @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #getPropertyChangeListeners(java.lang.String)
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
*/
public void addPropertyChangeListener(
String propertyName,
PropertyChangeListener listener) {
synchronized (getObjectLock()) {
if (listener == null) {
return;
}
if (changeSupport == null) {
changeSupport = new PropertyChangeSupport(this);
}
changeSupport.addPropertyChangeListener(propertyName, listener);
}
}
/**
* Removes a <code>PropertyChangeListener</code> from the listener
* list for a specific property. This method should be used to remove
* <code>PropertyChangeListener</code>s
* that were registered for a specific bound property.
* <p>
* If <code>propertyName</code> or <code>listener</code> is <code>null</code>,
* no exception is thrown and no action is taken.
*
* @param propertyName a valid property name
* @param listener the PropertyChangeListener to be removed
*
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #getPropertyChangeListeners(java.lang.String)
* @see #removePropertyChangeListener(java.beans.PropertyChangeListener)
*/
public void removePropertyChangeListener(
String propertyName,
PropertyChangeListener listener) {
synchronized (getObjectLock()) {
if (listener == null || changeSupport == null) {
return;
}
changeSupport.removePropertyChangeListener(propertyName, listener);
}
}
/**
* Returns an array of all the listeners which have been associated
* with the named property.
*
* @return all of the <code>PropertyChangeListener</code>s associated with
* the named property; if no such listeners have been added or
* if <code>propertyName</code> is <code>null</code>, an empty
* array is returned
*
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #getPropertyChangeListeners
* @since 1.4
*/
public PropertyChangeListener[] getPropertyChangeListeners(
String propertyName) {
synchronized (getObjectLock()) {
if (changeSupport == null) {
return new PropertyChangeListener[0];
}
return changeSupport.getPropertyChangeListeners(propertyName);
}
}
/**
* Support for reporting bound property changes for Object properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
*/
protected void firePropertyChange(String propertyName,
Object oldValue, Object newValue) {
PropertyChangeSupport changeSupport;
synchronized (getObjectLock()) {
changeSupport = this.changeSupport;
}
if (changeSupport == null ||
(oldValue != null && newValue != null && oldValue.equals(newValue))) {
return;
}
changeSupport.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Support for reporting bound property changes for boolean properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
* @since 1.4
*/
protected void firePropertyChange(String propertyName,
boolean oldValue, boolean newValue) {
PropertyChangeSupport changeSupport = this.changeSupport;
if (changeSupport == null || oldValue == newValue) {
return;
}
changeSupport.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Support for reporting bound property changes for integer properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
* @since 1.4
*/
protected void firePropertyChange(String propertyName,
int oldValue, int newValue) {
PropertyChangeSupport changeSupport = this.changeSupport;
if (changeSupport == null || oldValue == newValue) {
return;
}
changeSupport.firePropertyChange(propertyName, oldValue, newValue);
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a byte)
* @param newValue the new value of the property (as a byte)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {
if (changeSupport == null || oldValue == newValue) {
return;
}
firePropertyChange(propertyName, Byte.valueOf(oldValue), Byte.valueOf(newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a char)
* @param newValue the new value of the property (as a char)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void firePropertyChange(String propertyName, char oldValue, char newValue) {
if (changeSupport == null || oldValue == newValue) {
return;
}
firePropertyChange(propertyName, new Character(oldValue), new Character(newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a short)
* @param newValue the old value of the property (as a short)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void firePropertyChange(String propertyName, short oldValue, short newValue) {
if (changeSupport == null || oldValue == newValue) {
return;
}
firePropertyChange(propertyName, Short.valueOf(oldValue), Short.valueOf(newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a long)
* @param newValue the new value of the property (as a long)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void firePropertyChange(String propertyName, long oldValue, long newValue) {
if (changeSupport == null || oldValue == newValue) {
return;
}
firePropertyChange(propertyName, Long.valueOf(oldValue), Long.valueOf(newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a float)
* @param newValue the new value of the property (as a float)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void firePropertyChange(String propertyName, float oldValue, float newValue) {
if (changeSupport == null || oldValue == newValue) {
return;
}
firePropertyChange(propertyName, Float.valueOf(oldValue), Float.valueOf(newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a double)
* @param newValue the new value of the property (as a double)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void firePropertyChange(String propertyName, double oldValue, double newValue) {
if (changeSupport == null || oldValue == newValue) {
return;
}
firePropertyChange(propertyName, Double.valueOf(oldValue), Double.valueOf(newValue));
}
// Serialization support.
/**
* Component Serialized Data Version.
*
* @serial
*/
private int componentSerializedDataVersion = 4;
/**
* This hack is for Swing serialization. It will invoke
* the Swing package private method <code>compWriteObjectNotify</code>.
*/
private void doSwingSerialization() {
Package swingPackage = Package.getPackage("javax.swing");
// For Swing serialization to correctly work Swing needs to
// be notified before Component does it's serialization. This
// hack accomodates this.
//
// Swing classes MUST be loaded by the bootstrap class loader,
// otherwise we don't consider them.
for (Class<?> klass = Component.this.getClass(); klass != null;
klass = klass.getSuperclass()) {
if (klass.getPackage() == swingPackage &&
klass.getClassLoader() == null) {
final Class<?> swingClass = klass;
// Find the first override of the compWriteObjectNotify method
Method[] methods = AccessController.doPrivileged(
new PrivilegedAction<Method[]>() {
public Method[] run() {
return swingClass.getDeclaredMethods();
}
});
for (int counter = methods.length - 1; counter >= 0;
counter--) {
final Method method = methods[counter];
if (method.getName().equals("compWriteObjectNotify")){
// We found it, use doPrivileged to make it accessible
// to use.
AccessController.doPrivileged(new PrivilegedAction<Void>() {
public Void run() {
method.setAccessible(true);
return null;
}
});
// Invoke the method
try {
method.invoke(this, (Object[]) null);
} catch (IllegalAccessException iae) {
} catch (InvocationTargetException ite) {
}
// We're done, bail.
return;
}
}
}
}
}
/**
* Writes default serializable fields to stream. Writes
* a variety of serializable listeners as optional data.
* The non-serializable listeners are detected and
* no attempt is made to serialize them.
*
* @param s the <code>ObjectOutputStream</code> to write
* @serialData <code>null</code> terminated sequence of
* 0 or more pairs; the pair consists of a <code>String</code>
* and an <code>Object</code>; the <code>String</code> indicates
* the type of object and is one of the following (as of 1.4):
* <code>componentListenerK</code> indicating an
* <code>ComponentListener</code> object;
* <code>focusListenerK</code> indicating an
* <code>FocusListener</code> object;
* <code>keyListenerK</code> indicating an
* <code>KeyListener</code> object;
* <code>mouseListenerK</code> indicating an
* <code>MouseListener</code> object;
* <code>mouseMotionListenerK</code> indicating an
* <code>MouseMotionListener</code> object;
* <code>inputMethodListenerK</code> indicating an
* <code>InputMethodListener</code> object;
* <code>hierarchyListenerK</code> indicating an
* <code>HierarchyListener</code> object;
* <code>hierarchyBoundsListenerK</code> indicating an
* <code>HierarchyBoundsListener</code> object;
* <code>mouseWheelListenerK</code> indicating an
* <code>MouseWheelListener</code> object
* @serialData an optional <code>ComponentOrientation</code>
* (after <code>inputMethodListener</code>, as of 1.2)
*
* @see AWTEventMulticaster#save(java.io.ObjectOutputStream, java.lang.String, java.util.EventListener)
* @see #componentListenerK
* @see #focusListenerK
* @see #keyListenerK
* @see #mouseListenerK
* @see #mouseMotionListenerK
* @see #inputMethodListenerK
* @see #hierarchyListenerK
* @see #hierarchyBoundsListenerK
* @see #mouseWheelListenerK
* @see #readObject(ObjectInputStream)
*/
private void writeObject(ObjectOutputStream s)
throws IOException
{
doSwingSerialization();
s.defaultWriteObject();
AWTEventMulticaster.save(s, componentListenerK, componentListener);
AWTEventMulticaster.save(s, focusListenerK, focusListener);
AWTEventMulticaster.save(s, keyListenerK, keyListener);
AWTEventMulticaster.save(s, mouseListenerK, mouseListener);
AWTEventMulticaster.save(s, mouseMotionListenerK, mouseMotionListener);
AWTEventMulticaster.save(s, inputMethodListenerK, inputMethodListener);
s.writeObject(null);
s.writeObject(componentOrientation);
AWTEventMulticaster.save(s, hierarchyListenerK, hierarchyListener);
AWTEventMulticaster.save(s, hierarchyBoundsListenerK,
hierarchyBoundsListener);
s.writeObject(null);
AWTEventMulticaster.save(s, mouseWheelListenerK, mouseWheelListener);
s.writeObject(null);
}
/**
* Reads the <code>ObjectInputStream</code> and if it isn't
* <code>null</code> adds a listener to receive a variety
* of events fired by the component.
* Unrecognized keys or values will be ignored.
*
* @param s the <code>ObjectInputStream</code> to read
* @see #writeObject(ObjectOutputStream)
*/
private void readObject(ObjectInputStream s)
throws ClassNotFoundException, IOException
{
objectLock = new Object();
acc = AccessController.getContext();
s.defaultReadObject();
appContext = AppContext.getAppContext();
coalescingEnabled = checkCoalescing();
if (componentSerializedDataVersion < 4) {
// These fields are non-transient and rely on default
// serialization. However, the default values are insufficient,
// so we need to set them explicitly for object data streams prior
// to 1.4.
focusable = true;
isFocusTraversableOverridden = FOCUS_TRAVERSABLE_UNKNOWN;
initializeFocusTraversalKeys();
focusTraversalKeysEnabled = true;
}
Object keyOrNull;
while(null != (keyOrNull = s.readObject())) {
String key = ((String)keyOrNull).intern();
if (componentListenerK == key)
addComponentListener((ComponentListener)(s.readObject()));
else if (focusListenerK == key)
addFocusListener((FocusListener)(s.readObject()));
else if (keyListenerK == key)
addKeyListener((KeyListener)(s.readObject()));
else if (mouseListenerK == key)
addMouseListener((MouseListener)(s.readObject()));
else if (mouseMotionListenerK == key)
addMouseMotionListener((MouseMotionListener)(s.readObject()));
else if (inputMethodListenerK == key)
addInputMethodListener((InputMethodListener)(s.readObject()));
else // skip value for unrecognized key
s.readObject();
}
// Read the component's orientation if it's present
Object orient = null;
try {
orient = s.readObject();
} catch (java.io.OptionalDataException e) {
// JDK 1.1 instances will not have this optional data.
// e.eof will be true to indicate that there is no more
// data available for this object.
// If e.eof is not true, throw the exception as it
// might have been caused by reasons unrelated to
// componentOrientation.
if (!e.eof) {
throw (e);
}
}
if (orient != null) {
componentOrientation = (ComponentOrientation)orient;
} else {
componentOrientation = ComponentOrientation.UNKNOWN;
}
try {
while(null != (keyOrNull = s.readObject())) {
String key = ((String)keyOrNull).intern();
if (hierarchyListenerK == key) {
addHierarchyListener((HierarchyListener)(s.readObject()));
}
else if (hierarchyBoundsListenerK == key) {
addHierarchyBoundsListener((HierarchyBoundsListener)
(s.readObject()));
}
else {
// skip value for unrecognized key
s.readObject();
}
}
} catch (java.io.OptionalDataException e) {
// JDK 1.1/1.2 instances will not have this optional data.
// e.eof will be true to indicate that there is no more
// data available for this object.
// If e.eof is not true, throw the exception as it
// might have been caused by reasons unrelated to
// hierarchy and hierarchyBounds listeners.
if (!e.eof) {
throw (e);
}
}
try {
while (null != (keyOrNull = s.readObject())) {
String key = ((String)keyOrNull).intern();
if (mouseWheelListenerK == key) {
addMouseWheelListener((MouseWheelListener)(s.readObject()));
}
else {
// skip value for unrecognized key
s.readObject();
}
}
} catch (java.io.OptionalDataException e) {
// pre-1.3 instances will not have this optional data.
// e.eof will be true to indicate that there is no more
// data available for this object.
// If e.eof is not true, throw the exception as it
// might have been caused by reasons unrelated to
// mouse wheel listeners
if (!e.eof) {
throw (e);
}
}
if (popups != null) {
int npopups = popups.size();
for (int i = 0 ; i < npopups ; i++) {
PopupMenu popup = popups.elementAt(i);
popup.parent = this;
}
}
}
/**
* Sets the language-sensitive orientation that is to be used to order
* the elements or text within this component. Language-sensitive
* <code>LayoutManager</code> and <code>Component</code>
* subclasses will use this property to
* determine how to lay out and draw components.
* <p>
* At construction time, a component's orientation is set to
* <code>ComponentOrientation.UNKNOWN</code>,
* indicating that it has not been specified
* explicitly. The UNKNOWN orientation behaves the same as
* <code>ComponentOrientation.LEFT_TO_RIGHT</code>.
* <p>
* To set the orientation of a single component, use this method.
* To set the orientation of an entire component
* hierarchy, use
* {@link #applyComponentOrientation applyComponentOrientation}.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
*
* @see ComponentOrientation
* @see #invalidate
*
* @author Laura Werner, IBM
* @beaninfo
* bound: true
*/
public void setComponentOrientation(ComponentOrientation o) {
ComponentOrientation oldValue = componentOrientation;
componentOrientation = o;
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("componentOrientation", oldValue, o);
// This could change the preferred size of the Component.
invalidateIfValid();
}
/**
* Retrieves the language-sensitive orientation that is to be used to order
* the elements or text within this component. <code>LayoutManager</code>
* and <code>Component</code>
* subclasses that wish to respect orientation should call this method to
* get the component's orientation before performing layout or drawing.
*
* @see ComponentOrientation
*
* @author Laura Werner, IBM
*/
public ComponentOrientation getComponentOrientation() {
return componentOrientation;
}
/**
* Sets the <code>ComponentOrientation</code> property of this component
* and all components contained within it.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
*
* @param orientation the new component orientation of this component and
* the components contained within it.
* @exception NullPointerException if <code>orientation</code> is null.
* @see #setComponentOrientation
* @see #getComponentOrientation
* @see #invalidate
* @since 1.4
*/
public void applyComponentOrientation(ComponentOrientation orientation) {
if (orientation == null) {
throw new NullPointerException();
}
setComponentOrientation(orientation);
}
final boolean canBeFocusOwner() {
// It is enabled, visible, focusable.
if (isEnabled() && isDisplayable() && isVisible() && isFocusable()) {
return true;
}
return false;
}
/**
* Checks that this component meets the prerequesites to be focus owner:
* - it is enabled, visible, focusable
* - it's parents are all enabled and showing
* - top-level window is focusable
* - if focus cycle root has DefaultFocusTraversalPolicy then it also checks that this policy accepts
* this component as focus owner
* @since 1.5
*/
final boolean canBeFocusOwnerRecursively() {
// - it is enabled, visible, focusable
if (!canBeFocusOwner()) {
return false;
}
// - it's parents are all enabled and showing
synchronized(getTreeLock()) {
if (parent != null) {
return parent.canContainFocusOwner(this);
}
}
return true;
}
/**
* Fix the location of the HW component in a LW container hierarchy.
*/
final void relocateComponent() {
synchronized (getTreeLock()) {
if (peer == null) {
return;
}
int nativeX = x;
int nativeY = y;
for (Component cont = getContainer();
cont != null && cont.isLightweight();
cont = cont.getContainer())
{
nativeX += cont.x;
nativeY += cont.y;
}
peer.setBounds(nativeX, nativeY, width, height,
ComponentPeer.SET_LOCATION);
}
}
/**
* Returns the <code>Window</code> ancestor of the component.
* @return Window ancestor of the component or component by itself if it is Window;
* null, if component is not a part of window hierarchy
*/
Window getContainingWindow() {
return SunToolkit.getContainingWindow(this);
}
/**
* Initialize JNI field and method IDs
*/
private static native void initIDs();
/*
* --- Accessibility Support ---
*
* Component will contain all of the methods in interface Accessible,
* though it won't actually implement the interface - that will be up
* to the individual objects which extend Component.
*/
/**
* The {@code AccessibleContext} associated with this {@code Component}.
*/
protected AccessibleContext accessibleContext = null;
/**
* Gets the <code>AccessibleContext</code> associated
* with this <code>Component</code>.
* The method implemented by this base
* class returns null. Classes that extend <code>Component</code>
* should implement this method to return the
* <code>AccessibleContext</code> associated with the subclass.
*
*
* @return the <code>AccessibleContext</code> of this
* <code>Component</code>
* @since 1.3
*/
public AccessibleContext getAccessibleContext() {
return accessibleContext;
}
/**
* Inner class of Component used to provide default support for
* accessibility. This class is not meant to be used directly by
* application developers, but is instead meant only to be
* subclassed by component developers.
* <p>
* The class used to obtain the accessible role for this object.
* @since 1.3
*/
protected abstract class AccessibleAWTComponent extends AccessibleContext
implements Serializable, AccessibleComponent {
private static final long serialVersionUID = 642321655757800191L;
/**
* Though the class is abstract, this should be called by
* all sub-classes.
*/
protected AccessibleAWTComponent() {
}
/**
* Number of PropertyChangeListener objects registered. It's used
* to add/remove ComponentListener and FocusListener to track
* target Component's state.
*/
private volatile transient int propertyListenersCount = 0;
protected ComponentListener accessibleAWTComponentHandler = null;
protected FocusListener accessibleAWTFocusHandler = null;
/**
* Fire PropertyChange listener, if one is registered,
* when shown/hidden..
* @since 1.3
*/
protected class AccessibleAWTComponentHandler implements ComponentListener {
public void componentHidden(ComponentEvent e) {
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
AccessibleState.VISIBLE, null);
}
}
public void componentShown(ComponentEvent e) {
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, AccessibleState.VISIBLE);
}
}
public void componentMoved(ComponentEvent e) {
}
public void componentResized(ComponentEvent e) {
}
} // inner class AccessibleAWTComponentHandler
/**
* Fire PropertyChange listener, if one is registered,
* when focus events happen
* @since 1.3
*/
protected class AccessibleAWTFocusHandler implements FocusListener {
public void focusGained(FocusEvent event) {
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
null, AccessibleState.FOCUSED);
}
}
public void focusLost(FocusEvent event) {
if (accessibleContext != null) {
accessibleContext.firePropertyChange(
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