JDK8/Java8源码在线阅读
/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* 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 javax.swing;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import java.security.AccessController;
import javax.accessibility.*;
import javax.swing.plaf.RootPaneUI;
import java.util.Vector;
import java.io.Serializable;
import javax.swing.border.*;
import sun.awt.AWTAccessor;
import sun.security.action.GetBooleanAction;
/**
* A lightweight container used behind the scenes by
* <code>JFrame</code>, <code>JDialog</code>, <code>JWindow</code>,
* <code>JApplet</code>, and <code>JInternalFrame</code>.
* For task-oriented information on functionality provided by root panes
* see <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html">How to Use Root Panes</a>,
* a section in <em>The Java Tutorial</em>.
*
* <p>
* The following image shows the relationships between
* the classes that use root panes.
* <p style="text-align:center"><img src="doc-files/JRootPane-1.gif"
* alt="The following text describes this graphic."
* HEIGHT=484 WIDTH=629></p>
* The "heavyweight" components (those that delegate to a peer, or native
* component on the host system) are shown with a darker, heavier box. The four
* heavyweight JFC/Swing containers (<code>JFrame</code>, <code>JDialog</code>,
* <code>JWindow</code>, and <code>JApplet</code>) are
* shown in relation to the AWT classes they extend.
* These four components are the
* only heavyweight containers in the Swing library. The lightweight container
* <code>JInternalFrame</code> is also shown.
* All five of these JFC/Swing containers implement the
* <code>RootPaneContainer</code> interface,
* and they all delegate their operations to a
* <code>JRootPane</code> (shown with a little "handle" on top).
* <blockquote>
* <b>Note:</b> The <code>JComponent</code> method <code>getRootPane</code>
* can be used to obtain the <code>JRootPane</code> that contains
* a given component.
* </blockquote>
* <table style="float:right" border="0" summary="layout">
* <tr>
* <td align="center">
* <img src="doc-files/JRootPane-2.gif"
* alt="The following text describes this graphic." HEIGHT=386 WIDTH=349>
* </td>
* </tr>
* </table>
* The diagram at right shows the structure of a <code>JRootPane</code>.
* A <code>JRootpane</code> is made up of a <code>glassPane</code>,
* an optional <code>menuBar</code>, and a <code>contentPane</code>.
* (The <code>JLayeredPane</code> manages the <code>menuBar</code>
* and the <code>contentPane</code>.)
* The <code>glassPane</code> sits over the top of everything,
* where it is in a position to intercept mouse movements.
* Since the <code>glassPane</code> (like the <code>contentPane</code>)
* can be an arbitrary component, it is also possible to set up the
* <code>glassPane</code> for drawing. Lines and images on the
* <code>glassPane</code> can then range
* over the frames underneath without being limited by their boundaries.
* <p>
* Although the <code>menuBar</code> component is optional,
* the <code>layeredPane</code>, <code>contentPane</code>,
* and <code>glassPane</code> always exist.
* Attempting to set them to <code>null</code> generates an exception.
* <p>
* To add components to the <code>JRootPane</code> (other than the
* optional menu bar), you add the object to the <code>contentPane</code>
* of the <code>JRootPane</code>, like this:
* <pre>
* rootPane.getContentPane().add(child);
* </pre>
* The same principle holds true for setting layout managers, removing
* components, listing children, etc. All these methods are invoked on
* the <code>contentPane</code> instead of on the <code>JRootPane</code>.
* <blockquote>
* <b>Note:</b> The default layout manager for the <code>contentPane</code> is
* a <code>BorderLayout</code> manager. However, the <code>JRootPane</code>
* uses a custom <code>LayoutManager</code>.
* So, when you want to change the layout manager for the components you added
* to a <code>JRootPane</code>, be sure to use code like this:
* <pre>
* rootPane.getContentPane().setLayout(new BoxLayout());
* </pre></blockquote>
* If a <code>JMenuBar</code> component is set on the <code>JRootPane</code>,
* it is positioned along the upper edge of the frame.
* The <code>contentPane</code> is adjusted in location and size to
* fill the remaining area.
* (The <code>JMenuBar</code> and the <code>contentPane</code> are added to the
* <code>layeredPane</code> component at the
* <code>JLayeredPane.FRAME_CONTENT_LAYER</code> layer.)
* <p>
* The <code>layeredPane</code> is the parent of all children in the
* <code>JRootPane</code> -- both as the direct parent of the menu and
* the grandparent of all components added to the <code>contentPane</code>.
* It is an instance of <code>JLayeredPane</code>,
* which provides the ability to add components at several layers.
* This capability is very useful when working with menu popups,
* dialog boxes, and dragging -- situations in which you need to place
* a component on top of all other components in the pane.
* <p>
* The <code>glassPane</code> sits on top of all other components in the
* <code>JRootPane</code>.
* That provides a convenient place to draw above all other components,
* and makes it possible to intercept mouse events,
* which is useful both for dragging and for drawing.
* Developers can use <code>setVisible</code> on the <code>glassPane</code>
* to control when the <code>glassPane</code> displays over the other children.
* By default the <code>glassPane</code> is not visible.
* <p>
* The custom <code>LayoutManager</code> used by <code>JRootPane</code>
* ensures that:
* <OL>
* <LI>The <code>glassPane</code> fills the entire viewable
* area of the <code>JRootPane</code> (bounds - insets).
* <LI>The <code>layeredPane</code> fills the entire viewable area of the
* <code>JRootPane</code>. (bounds - insets)
* <LI>The <code>menuBar</code> is positioned at the upper edge of the
* <code>layeredPane</code>.
* <LI>The <code>contentPane</code> fills the entire viewable area,
* minus the <code>menuBar</code>, if present.
* </OL>
* Any other views in the <code>JRootPane</code> view hierarchy are ignored.
* <p>
* If you replace the <code>LayoutManager</code> of the <code>JRootPane</code>,
* you are responsible for managing all of these views.
* So ordinarily you will want to be sure that you
* change the layout manager for the <code>contentPane</code> rather than
* for the <code>JRootPane</code> itself!
* <p>
* The painting architecture of Swing requires an opaque
* <code>JComponent</code>
* to exist in the containment hierarchy above all other components. This is
* typically provided by way of the content pane. If you replace the content
* pane, it is recommended that you make the content pane opaque
* by way of <code>setOpaque(true)</code>. Additionally, if the content pane
* overrides <code>paintComponent</code>, it
* will need to completely fill in the background in an opaque color in
* <code>paintComponent</code>.
* <p>
* <strong>Warning:</strong> Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @see JLayeredPane
* @see JMenuBar
* @see JWindow
* @see JFrame
* @see JDialog
* @see JApplet
* @see JInternalFrame
* @see JComponent
* @see BoxLayout
*
* @see <a href="http://java.sun.com/products/jfc/tsc/articles/mixing/">
* Mixing Heavy and Light Components</a>
*
* @author David Kloba
*/
/// PENDING(klobad) Who should be opaque in this component?
@SuppressWarnings("serial")
public class JRootPane extends JComponent implements Accessible {
private static final String uiClassID = "RootPaneUI";
/**
* Whether or not we should dump the stack when true double buffering
* is disabled. Default is false.
*/
private static final boolean LOG_DISABLE_TRUE_DOUBLE_BUFFERING;
/**
* Whether or not we should ignore requests to disable true double
* buffering. Default is false.
*/
private static final boolean IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should not provide any sort of
* Window decorations.
*
* @since 1.4
*/
public static final int NONE = 0;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Frame.
*
* @since 1.4
*/
public static final int FRAME = 1;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Dialog.
*
* @since 1.4
*/
public static final int PLAIN_DIALOG = 2;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Dialog used to display an informational message.
*
* @since 1.4
*/
public static final int INFORMATION_DIALOG = 3;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Dialog used to display an error message.
*
* @since 1.4
*/
public static final int ERROR_DIALOG = 4;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Dialog used to display a <code>JColorChooser</code>.
*
* @since 1.4
*/
public static final int COLOR_CHOOSER_DIALOG = 5;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Dialog used to display a <code>JFileChooser</code>.
*
* @since 1.4
*/
public static final int FILE_CHOOSER_DIALOG = 6;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Dialog used to present a question to the user.
*
* @since 1.4
*/
public static final int QUESTION_DIALOG = 7;
/**
* Constant used for the windowDecorationStyle property. Indicates that
* the <code>JRootPane</code> should provide decorations appropriate for
* a Dialog used to display a warning message.
*
* @since 1.4
*/
public static final int WARNING_DIALOG = 8;
private int windowDecorationStyle;
/** The menu bar. */
protected JMenuBar menuBar;
/** The content pane. */
protected Container contentPane;
/** The layered pane that manages the menu bar and content pane. */
protected JLayeredPane layeredPane;
/**
* The glass pane that overlays the menu bar and content pane,
* so it can intercept mouse movements and such.
*/
protected Component glassPane;
/**
* The button that gets activated when the pane has the focus and
* a UI-specific action like pressing the <b>Enter</b> key occurs.
*/
protected JButton defaultButton;
/**
* As of Java 2 platform v1.3 this unusable field is no longer used.
* To override the default button you should replace the <code>Action</code>
* in the <code>JRootPane</code>'s <code>ActionMap</code>. Please refer to
* the key bindings specification for further details.
*
* @deprecated As of Java 2 platform v1.3.
* @see #defaultButton
*/
@Deprecated
protected DefaultAction defaultPressAction;
/**
* As of Java 2 platform v1.3 this unusable field is no longer used.
* To override the default button you should replace the <code>Action</code>
* in the <code>JRootPane</code>'s <code>ActionMap</code>. Please refer to
* the key bindings specification for further details.
*
* @deprecated As of Java 2 platform v1.3.
* @see #defaultButton
*/
@Deprecated
protected DefaultAction defaultReleaseAction;
/**
* Whether or not true double buffering should be used. This is typically
* true, but may be set to false in special situations. For example,
* heavy weight popups (backed by a window) set this to false.
*/
boolean useTrueDoubleBuffering = true;
static {
LOG_DISABLE_TRUE_DOUBLE_BUFFERING =
AccessController.doPrivileged(new GetBooleanAction(
"swing.logDoubleBufferingDisable"));
IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING =
AccessController.doPrivileged(new GetBooleanAction(
"swing.ignoreDoubleBufferingDisable"));
}
/**
* Creates a <code>JRootPane</code>, setting up its
* <code>glassPane</code>, <code>layeredPane</code>,
* and <code>contentPane</code>.
*/
public JRootPane() {
setGlassPane(createGlassPane());
setLayeredPane(createLayeredPane());
setContentPane(createContentPane());
setLayout(createRootLayout());
setDoubleBuffered(true);
updateUI();
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void setDoubleBuffered(boolean aFlag) {
if (isDoubleBuffered() != aFlag) {
super.setDoubleBuffered(aFlag);
RepaintManager.currentManager(this).doubleBufferingChanged(this);
}
}
/**
* Returns a constant identifying the type of Window decorations the
* <code>JRootPane</code> is providing.
*
* @return One of <code>NONE</code>, <code>FRAME</code>,
* <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
* <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
* <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code> or
* <code>WARNING_DIALOG</code>.
* @see #setWindowDecorationStyle
* @since 1.4
*/
public int getWindowDecorationStyle() {
return windowDecorationStyle;
}
/**
* Sets the type of Window decorations (such as borders, widgets for
* closing a Window, title ...) the <code>JRootPane</code> should
* provide. The default is to provide no Window decorations
* (<code>NONE</code>).
* <p>
* This is only a hint, and some look and feels may not support
* this.
* This is a bound property.
*
* @param windowDecorationStyle Constant identifying Window decorations
* to provide.
* @see JDialog#setDefaultLookAndFeelDecorated
* @see JFrame#setDefaultLookAndFeelDecorated
* @see LookAndFeel#getSupportsWindowDecorations
* @throws IllegalArgumentException if <code>style</code> is
* not one of: <code>NONE</code>, <code>FRAME</code>,
* <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
* <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
* <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code>, or
* <code>WARNING_DIALOG</code>.
* @since 1.4
* @beaninfo
* bound: true
* enum: NONE JRootPane.NONE
* FRAME JRootPane.FRAME
* PLAIN_DIALOG JRootPane.PLAIN_DIALOG
* INFORMATION_DIALOG JRootPane.INFORMATION_DIALOG
* ERROR_DIALOG JRootPane.ERROR_DIALOG
* COLOR_CHOOSER_DIALOG JRootPane.COLOR_CHOOSER_DIALOG
* FILE_CHOOSER_DIALOG JRootPane.FILE_CHOOSER_DIALOG
* QUESTION_DIALOG JRootPane.QUESTION_DIALOG
* WARNING_DIALOG JRootPane.WARNING_DIALOG
* expert: true
* attribute: visualUpdate true
* description: Identifies the type of Window decorations to provide
*/
public void setWindowDecorationStyle(int windowDecorationStyle) {
if (windowDecorationStyle < 0 ||
windowDecorationStyle > WARNING_DIALOG) {
throw new IllegalArgumentException("Invalid decoration style");
}
int oldWindowDecorationStyle = getWindowDecorationStyle();
this.windowDecorationStyle = windowDecorationStyle;
firePropertyChange("windowDecorationStyle",
oldWindowDecorationStyle,
windowDecorationStyle);
}
/**
* Returns the L&F object that renders this component.
*
* @return <code>LabelUI</code> object
* @since 1.3
*/
public RootPaneUI getUI() {
return (RootPaneUI)ui;
}
/**
* Sets the L&F object that renders this component.
*
* @param ui the <code>LabelUI</code> L&F object
* @see UIDefaults#getUI
* @beaninfo
* bound: true
* hidden: true
* expert: true
* attribute: visualUpdate true
* description: The UI object that implements the Component's LookAndFeel.
* @since 1.3
*/
public void setUI(RootPaneUI ui) {
super.setUI(ui);
}
/**
* Resets the UI property to a value from the current look and feel.
*
* @see JComponent#updateUI
*/
public void updateUI() {
setUI((RootPaneUI)UIManager.getUI(this));
}
/**
* Returns a string that specifies the name of the L&F class
* that renders this component.
*
* @return the string "RootPaneUI"
*
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
*/
public String getUIClassID() {
return uiClassID;
}
/**
* Called by the constructor methods to create the default
* <code>layeredPane</code>.
* Bt default it creates a new <code>JLayeredPane</code>.
* @return the default <code>layeredPane</code>
*/
protected JLayeredPane createLayeredPane() {
JLayeredPane p = new JLayeredPane();
p.setName(this.getName()+".layeredPane");
return p;
}
/**
* Called by the constructor methods to create the default
* <code>contentPane</code>.
* By default this method creates a new <code>JComponent</code> add sets a
* <code>BorderLayout</code> as its <code>LayoutManager</code>.
* @return the default <code>contentPane</code>
*/
protected Container createContentPane() {
JComponent c = new JPanel();
c.setName(this.getName()+".contentPane");
c.setLayout(new BorderLayout() {
/* This BorderLayout subclass maps a null constraint to CENTER.
* Although the reference BorderLayout also does this, some VMs
* throw an IllegalArgumentException.
*/
public void addLayoutComponent(Component comp, Object constraints) {
if (constraints == null) {
constraints = BorderLayout.CENTER;
}
super.addLayoutComponent(comp, constraints);
}
});
return c;
}
/**
* Called by the constructor methods to create the default
* <code>glassPane</code>.
* By default this method creates a new <code>JComponent</code>
* with visibility set to false.
* @return the default <code>glassPane</code>
*/
protected Component createGlassPane() {
JComponent c = new JPanel();
c.setName(this.getName()+".glassPane");
c.setVisible(false);
((JPanel)c).setOpaque(false);
return c;
}
/**
* Called by the constructor methods to create the default
* <code>layoutManager</code>.
* @return the default <code>layoutManager</code>.
*/
protected LayoutManager createRootLayout() {
return new RootLayout();
}
/**
* Adds or changes the menu bar used in the layered pane.
* @param menu the <code>JMenuBar</code> to add
*/
public void setJMenuBar(JMenuBar menu) {
if(menuBar != null && menuBar.getParent() == layeredPane)
layeredPane.remove(menuBar);
menuBar = menu;
if(menuBar != null)
layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
}
/**
* Specifies the menu bar value.
* @deprecated As of Swing version 1.0.3
* replaced by <code>setJMenuBar(JMenuBar menu)</code>.
* @param menu the <code>JMenuBar</code> to add.
*/
@Deprecated
public void setMenuBar(JMenuBar menu){
if(menuBar != null && menuBar.getParent() == layeredPane)
layeredPane.remove(menuBar);
menuBar = menu;
if(menuBar != null)
layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
}
/**
* Returns the menu bar from the layered pane.
* @return the <code>JMenuBar</code> used in the pane
*/
public JMenuBar getJMenuBar() { return menuBar; }
/**
* Returns the menu bar value.
* @deprecated As of Swing version 1.0.3
* replaced by <code>getJMenuBar()</code>.
* @return the <code>JMenuBar</code> used in the pane
*/
@Deprecated
public JMenuBar getMenuBar() { return menuBar; }
/**
* Sets the content pane -- the container that holds the components
* parented by the root pane.
* <p>
* Swing's painting architecture requires an opaque <code>JComponent</code>
* in the containment hierarchy. This is typically provided by the
* content pane. If you replace the content pane it is recommended you
* replace it with an opaque <code>JComponent</code>.
*
* @param content the <code>Container</code> to use for component-contents
* @exception java.awt.IllegalComponentStateException (a runtime
* exception) if the content pane parameter is <code>null</code>
*/
public void setContentPane(Container content) {
if(content == null)
throw new IllegalComponentStateException("contentPane cannot be set to null.");
if(contentPane != null && contentPane.getParent() == layeredPane)
layeredPane.remove(contentPane);
contentPane = content;
layeredPane.add(contentPane, JLayeredPane.FRAME_CONTENT_LAYER);
}
/**
* Returns the content pane -- the container that holds the components
* parented by the root pane.
*
* @return the <code>Container</code> that holds the component-contents
*/
public Container getContentPane() { return contentPane; }
// PENDING(klobad) Should this reparent the contentPane and MenuBar?
/**
* Sets the layered pane for the root pane. The layered pane
* typically holds a content pane and an optional <code>JMenuBar</code>.
*
* @param layered the <code>JLayeredPane</code> to use
* @exception java.awt.IllegalComponentStateException (a runtime
* exception) if the layered pane parameter is <code>null</code>
*/
public void setLayeredPane(JLayeredPane layered) {
if(layered == null)
throw new IllegalComponentStateException("layeredPane cannot be set to null.");
if(layeredPane != null && layeredPane.getParent() == this)
this.remove(layeredPane);
layeredPane = layered;
this.add(layeredPane, -1);
}
/**
* Gets the layered pane used by the root pane. The layered pane
* typically holds a content pane and an optional <code>JMenuBar</code>.
*
* @return the <code>JLayeredPane</code> currently in use
*/
public JLayeredPane getLayeredPane() { return layeredPane; }
/**
* Sets a specified <code>Component</code> to be the glass pane for this
* root pane. The glass pane should normally be a lightweight,
* transparent component, because it will be made visible when
* ever the root pane needs to grab input events.
* <p>
* The new glass pane's visibility is changed to match that of
* the current glass pane. An implication of this is that care
* must be taken when you want to replace the glass pane and
* make it visible. Either of the following will work:
* <pre>
* root.setGlassPane(newGlassPane);
* newGlassPane.setVisible(true);
* </pre>
* or:
* <pre>
* root.getGlassPane().setVisible(true);
* root.setGlassPane(newGlassPane);
* </pre>
*
* @param glass the <code>Component</code> to use as the glass pane
* for this <code>JRootPane</code>
* @exception NullPointerException if the <code>glass</code> parameter is
* <code>null</code>
*/
public void setGlassPane(Component glass) {
if (glass == null) {
throw new NullPointerException("glassPane cannot be set to null.");
}
AWTAccessor.getComponentAccessor().setMixingCutoutShape(glass,
new Rectangle());
boolean visible = false;
if (glassPane != null && glassPane.getParent() == this) {
this.remove(glassPane);
visible = glassPane.isVisible();
}
glass.setVisible(visible);
glassPane = glass;
this.add(glassPane, 0);
if (visible) {
repaint();
}
}
/**
* Returns the current glass pane for this <code>JRootPane</code>.
* @return the current glass pane
* @see #setGlassPane
*/
public Component getGlassPane() {
return glassPane;
}
/**
* If a descendant of this <code>JRootPane</code> calls
* <code>revalidate</code>, validate from here on down.
*<p>
* Deferred requests to layout a component and its descendents again.
* For example, calls to <code>revalidate</code>, are pushed upwards to
* either a <code>JRootPane</code> or a <code>JScrollPane</code>
* because both classes override <code>isValidateRoot</code> to return true.
*
* @see JComponent#isValidateRoot
* @see java.awt.Container#isValidateRoot
* @return true
*/
@Override
public boolean isValidateRoot() {
return true;
}
/**
* The <code>glassPane</code> and <code>contentPane</code>
* have the same bounds, which means <code>JRootPane</code>
* does not tiles its children and this should return false.
* On the other hand, the <code>glassPane</code>
* is normally not visible, and so this can return true if the
* <code>glassPane</code> isn't visible. Therefore, the
* return value here depends upon the visibility of the
* <code>glassPane</code>.
*
* @return true if this component's children don't overlap
*/
public boolean isOptimizedDrawingEnabled() {
return !glassPane.isVisible();
}
/**
* {@inheritDoc}
*/
public void addNotify() {
super.addNotify();
enableEvents(AWTEvent.KEY_EVENT_MASK);
}
/**
* {@inheritDoc}
*/
public void removeNotify() {
super.removeNotify();
}
/**
* Sets the <code>defaultButton</code> property,
* which determines the current default button for this <code>JRootPane</code>.
* The default button is the button which will be activated
* when a UI-defined activation event (typically the <b>Enter</b> key)
* occurs in the root pane regardless of whether or not the button
* has keyboard focus (unless there is another component within
* the root pane which consumes the activation event,
* such as a <code>JTextPane</code>).
* For default activation to work, the button must be an enabled
* descendent of the root pane when activation occurs.
* To remove a default button from this root pane, set this
* property to <code>null</code>.
*
* @see JButton#isDefaultButton
* @param defaultButton the <code>JButton</code> which is to be the default button
*
* @beaninfo
* description: The button activated by default in this root pane
*/
public void setDefaultButton(JButton defaultButton) {
JButton oldDefault = this.defaultButton;
if (oldDefault != defaultButton) {
this.defaultButton = defaultButton;
if (oldDefault != null) {
oldDefault.repaint();
}
if (defaultButton != null) {
defaultButton.repaint();
}
}
firePropertyChange("defaultButton", oldDefault, defaultButton);
}
/**
* Returns the value of the <code>defaultButton</code> property.
* @return the <code>JButton</code> which is currently the default button
* @see #setDefaultButton
*/
public JButton getDefaultButton() {
return defaultButton;
}
final void setUseTrueDoubleBuffering(boolean useTrueDoubleBuffering) {
this.useTrueDoubleBuffering = useTrueDoubleBuffering;
}
final boolean getUseTrueDoubleBuffering() {
return useTrueDoubleBuffering;
}
final void disableTrueDoubleBuffering() {
if (useTrueDoubleBuffering) {
if (!IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING) {
if (LOG_DISABLE_TRUE_DOUBLE_BUFFERING) {
System.out.println("Disabling true double buffering for " +
this);
Thread.dumpStack();
}
useTrueDoubleBuffering = false;
RepaintManager.currentManager(this).
doubleBufferingChanged(this);
}
}
}
@SuppressWarnings("serial")
static class DefaultAction extends AbstractAction {
JButton owner;
JRootPane root;
boolean press;
DefaultAction(JRootPane root, boolean press) {
this.root = root;
this.press = press;
}
public void setOwner(JButton owner) {
this.owner = owner;
}
public void actionPerformed(ActionEvent e) {
if (owner != null && SwingUtilities.getRootPane(owner) == root) {
ButtonModel model = owner.getModel();
if (press) {
model.setArmed(true);
model.setPressed(true);
} else {
model.setPressed(false);
}
}
}
public boolean isEnabled() {
return owner.getModel().isEnabled();
}
}
/**
* Overridden to enforce the position of the glass component as
* the zero child.
*
* @param comp the component to be enhanced
* @param constraints the constraints to be respected
* @param index the index
*/
protected void addImpl(Component comp, Object constraints, int index) {
super.addImpl(comp, constraints, index);
/// We are making sure the glassPane is on top.
if(glassPane != null
&& glassPane.getParent() == this
&& getComponent(0) != glassPane) {
add(glassPane, 0);
}
}
///////////////////////////////////////////////////////////////////////////////
//// Begin Inner Classes
///////////////////////////////////////////////////////////////////////////////
/**
* A custom layout manager that is responsible for the layout of
* layeredPane, glassPane, and menuBar.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
@SuppressWarnings("serial")
protected class RootLayout implements LayoutManager2, Serializable
{
/**
* Returns the amount of space the layout would like to have.
*
* @param parent the Container for which this layout manager
* is being used
* @return a Dimension object containing the layout's preferred size
*/
public Dimension preferredLayoutSize(Container parent) {
Dimension rd, mbd;
Insets i = getInsets();
if(contentPane != null) {
rd = contentPane.getPreferredSize();
} else {
rd = parent.getSize();
}
if(menuBar != null && menuBar.isVisible()) {
mbd = menuBar.getPreferredSize();
} else {
mbd = new Dimension(0, 0);
}
return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
rd.height + mbd.height + i.top + i.bottom);
}
/**
* Returns the minimum amount of space the layout needs.
*
* @param parent the Container for which this layout manager
* is being used
* @return a Dimension object containing the layout's minimum size
*/
public Dimension minimumLayoutSize(Container parent) {
Dimension rd, mbd;
Insets i = getInsets();
if(contentPane != null) {
rd = contentPane.getMinimumSize();
} else {
rd = parent.getSize();
}
if(menuBar != null && menuBar.isVisible()) {
mbd = menuBar.getMinimumSize();
} else {
mbd = new Dimension(0, 0);
}
return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
rd.height + mbd.height + i.top + i.bottom);
}
/**
* Returns the maximum amount of space the layout can use.
*
* @param target the Container for which this layout manager
* is being used
* @return a Dimension object containing the layout's maximum size
*/
public Dimension maximumLayoutSize(Container target) {
Dimension rd, mbd;
Insets i = getInsets();
if(menuBar != null && menuBar.isVisible()) {
mbd = menuBar.getMaximumSize();
} else {
mbd = new Dimension(0, 0);
}
if(contentPane != null) {
rd = contentPane.getMaximumSize();
} else {
// This is silly, but should stop an overflow error
rd = new Dimension(Integer.MAX_VALUE,
Integer.MAX_VALUE - i.top - i.bottom - mbd.height - 1);
}
return new Dimension(Math.min(rd.width, mbd.width) + i.left + i.right,
rd.height + mbd.height + i.top + i.bottom);
}
/**
* Instructs the layout manager to perform the layout for the specified
* container.
*
* @param parent the Container for which this layout manager
* is being used
*/
public void layoutContainer(Container parent) {
Rectangle b = parent.getBounds();
Insets i = getInsets();
int contentY = 0;
int w = b.width - i.right - i.left;
int h = b.height - i.top - i.bottom;
if(layeredPane != null) {
layeredPane.setBounds(i.left, i.top, w, h);
}
if(glassPane != null) {
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