JDK8/Java8源码在线阅读
/*
* Copyright (c) 2000, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.awt;
import java.awt.event.FocusEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.awt.event.WindowEvent;
import java.awt.peer.KeyboardFocusManagerPeer;
import java.awt.peer.LightweightPeer;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;
import java.beans.VetoableChangeSupport;
import java.lang.ref.WeakReference;
import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.WeakHashMap;
import sun.util.logging.PlatformLogger;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
import sun.awt.CausedFocusEvent;
import sun.awt.KeyboardFocusManagerPeerProvider;
import sun.awt.AWTAccessor;
/**
* The KeyboardFocusManager is responsible for managing the active and focused
* Windows, and the current focus owner. The focus owner is defined as the
* Component in an application that will typically receive all KeyEvents
* generated by the user. The focused Window is the Window that is, or
* contains, the focus owner. Only a Frame or a Dialog can be the active
* Window. The native windowing system may denote the active Window or its
* children with special decorations, such as a highlighted title bar. The
* active Window is always either the focused Window, or the first Frame or
* Dialog that is an owner of the focused Window.
* <p>
* The KeyboardFocusManager is both a centralized location for client code to
* query for the focus owner and initiate focus changes, and an event
* dispatcher for all FocusEvents, WindowEvents related to focus, and
* KeyEvents.
* <p>
* Some browsers partition applets in different code bases into separate
* contexts, and establish walls between these contexts. In such a scenario,
* there will be one KeyboardFocusManager per context. Other browsers place all
* applets into the same context, implying that there will be only a single,
* global KeyboardFocusManager for all applets. This behavior is
* implementation-dependent. Consult your browser's documentation for more
* information. No matter how many contexts there may be, however, there can
* never be more than one focus owner, focused Window, or active Window, per
* ClassLoader.
* <p>
* Please 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 David Mendenhall
*
* @see Window
* @see Frame
* @see Dialog
* @see java.awt.event.FocusEvent
* @see java.awt.event.WindowEvent
* @see java.awt.event.KeyEvent
* @since 1.4
*/
public abstract class KeyboardFocusManager
implements KeyEventDispatcher, KeyEventPostProcessor
{
// Shared focus engine logger
private static final PlatformLogger focusLog = PlatformLogger.getLogger("java.awt.focus.KeyboardFocusManager");
static {
/* ensure that the necessary native libraries are loaded */
Toolkit.loadLibraries();
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
AWTAccessor.setKeyboardFocusManagerAccessor(
new AWTAccessor.KeyboardFocusManagerAccessor() {
public int shouldNativelyFocusHeavyweight(Component heavyweight,
Component descendant,
boolean temporary,
boolean focusedWindowChangeAllowed,
long time,
CausedFocusEvent.Cause cause)
{
return KeyboardFocusManager.shouldNativelyFocusHeavyweight(
heavyweight, descendant, temporary, focusedWindowChangeAllowed, time, cause);
}
public boolean processSynchronousLightweightTransfer(Component heavyweight,
Component descendant,
boolean temporary,
boolean focusedWindowChangeAllowed,
long time)
{
return KeyboardFocusManager.processSynchronousLightweightTransfer(
heavyweight, descendant, temporary, focusedWindowChangeAllowed, time);
}
public void removeLastFocusRequest(Component heavyweight) {
KeyboardFocusManager.removeLastFocusRequest(heavyweight);
}
public void setMostRecentFocusOwner(Window window, Component component) {
KeyboardFocusManager.setMostRecentFocusOwner(window, component);
}
public KeyboardFocusManager getCurrentKeyboardFocusManager(AppContext ctx) {
return KeyboardFocusManager.getCurrentKeyboardFocusManager(ctx);
}
public Container getCurrentFocusCycleRoot() {
return KeyboardFocusManager.currentFocusCycleRoot;
}
}
);
}
transient KeyboardFocusManagerPeer peer;
/**
* Initialize JNI field and method IDs
*/
private static native void initIDs();
private static final PlatformLogger log = PlatformLogger.getLogger("java.awt.KeyboardFocusManager");
/**
* The identifier for the Forward focus traversal keys.
*
* @see #setDefaultFocusTraversalKeys
* @see #getDefaultFocusTraversalKeys
* @see Component#setFocusTraversalKeys
* @see Component#getFocusTraversalKeys
*/
public static final int FORWARD_TRAVERSAL_KEYS = 0;
/**
* The identifier for the Backward focus traversal keys.
*
* @see #setDefaultFocusTraversalKeys
* @see #getDefaultFocusTraversalKeys
* @see Component#setFocusTraversalKeys
* @see Component#getFocusTraversalKeys
*/
public static final int BACKWARD_TRAVERSAL_KEYS = 1;
/**
* The identifier for the Up Cycle focus traversal keys.
*
* @see #setDefaultFocusTraversalKeys
* @see #getDefaultFocusTraversalKeys
* @see Component#setFocusTraversalKeys
* @see Component#getFocusTraversalKeys
*/
public static final int UP_CYCLE_TRAVERSAL_KEYS = 2;
/**
* The identifier for the Down Cycle focus traversal keys.
*
* @see #setDefaultFocusTraversalKeys
* @see #getDefaultFocusTraversalKeys
* @see Component#setFocusTraversalKeys
* @see Component#getFocusTraversalKeys
*/
public static final int DOWN_CYCLE_TRAVERSAL_KEYS = 3;
static final int TRAVERSAL_KEY_LENGTH = DOWN_CYCLE_TRAVERSAL_KEYS + 1;
/**
* Returns the current KeyboardFocusManager instance for the calling
* thread's context.
*
* @return this thread's context's KeyboardFocusManager
* @see #setCurrentKeyboardFocusManager
*/
public static KeyboardFocusManager getCurrentKeyboardFocusManager() {
return getCurrentKeyboardFocusManager(AppContext.getAppContext());
}
synchronized static KeyboardFocusManager
getCurrentKeyboardFocusManager(AppContext appcontext)
{
KeyboardFocusManager manager = (KeyboardFocusManager)
appcontext.get(KeyboardFocusManager.class);
if (manager == null) {
manager = new DefaultKeyboardFocusManager();
appcontext.put(KeyboardFocusManager.class, manager);
}
return manager;
}
/**
* Sets the current KeyboardFocusManager instance for the calling thread's
* context. If null is specified, then the current KeyboardFocusManager
* is replaced with a new instance of DefaultKeyboardFocusManager.
* <p>
* If a SecurityManager is installed, the calling thread must be granted
* the AWTPermission "replaceKeyboardFocusManager" in order to replace the
* the current KeyboardFocusManager. If this permission is not granted,
* this method will throw a SecurityException, and the current
* KeyboardFocusManager will be unchanged.
*
* @param newManager the new KeyboardFocusManager for this thread's context
* @see #getCurrentKeyboardFocusManager
* @see DefaultKeyboardFocusManager
* @throws SecurityException if the calling thread does not have permission
* to replace the current KeyboardFocusManager
*/
public static void setCurrentKeyboardFocusManager(
KeyboardFocusManager newManager) throws SecurityException
{
checkReplaceKFMPermission();
KeyboardFocusManager oldManager = null;
synchronized (KeyboardFocusManager.class) {
AppContext appcontext = AppContext.getAppContext();
if (newManager != null) {
oldManager = getCurrentKeyboardFocusManager(appcontext);
appcontext.put(KeyboardFocusManager.class, newManager);
} else {
oldManager = getCurrentKeyboardFocusManager(appcontext);
appcontext.remove(KeyboardFocusManager.class);
}
}
if (oldManager != null) {
oldManager.firePropertyChange("managingFocus",
Boolean.TRUE,
Boolean.FALSE);
}
if (newManager != null) {
newManager.firePropertyChange("managingFocus",
Boolean.FALSE,
Boolean.TRUE);
}
}
/**
* The Component in an application that will typically receive all
* KeyEvents generated by the user.
*/
private static Component focusOwner;
/**
* The Component in an application that will regain focus when an
* outstanding temporary focus transfer has completed, or the focus owner,
* if no outstanding temporary transfer exists.
*/
private static Component permanentFocusOwner;
/**
* The Window which is, or contains, the focus owner.
*/
private static Window focusedWindow;
/**
* Only a Frame or a Dialog can be the active Window. The native windowing
* system may denote the active Window with a special decoration, such as a
* highlighted title bar. The active Window is always either the focused
* Window, or the first Frame or Dialog which is an owner of the focused
* Window.
*/
private static Window activeWindow;
/**
* The default FocusTraversalPolicy for all Windows that have no policy of
* their own set. If those Windows have focus-cycle-root children that have
* no keyboard-traversal policy of their own, then those children will also
* inherit this policy (as will, recursively, their focus-cycle-root
* children).
*/
private FocusTraversalPolicy defaultPolicy =
new DefaultFocusTraversalPolicy();
/**
* The bound property names of each focus traversal key.
*/
private static final String[] defaultFocusTraversalKeyPropertyNames = {
"forwardDefaultFocusTraversalKeys",
"backwardDefaultFocusTraversalKeys",
"upCycleDefaultFocusTraversalKeys",
"downCycleDefaultFocusTraversalKeys"
};
/**
* The default strokes for initializing the default focus traversal keys.
*/
private static final AWTKeyStroke[][] defaultFocusTraversalKeyStrokes = {
{
AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_TAB, 0, false),
AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_TAB, InputEvent.CTRL_DOWN_MASK | InputEvent.CTRL_MASK, false),
},
{
AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_TAB, InputEvent.SHIFT_DOWN_MASK | InputEvent.SHIFT_MASK, false),
AWTKeyStroke.getAWTKeyStroke(KeyEvent.VK_TAB,
InputEvent.SHIFT_DOWN_MASK | InputEvent.SHIFT_MASK | InputEvent.CTRL_DOWN_MASK | InputEvent.CTRL_MASK,
false),
},
{},
{},
};
/**
* The default focus traversal keys. Each array of traversal keys will be
* in effect on all Windows that have no such array of their own explicitly
* set. Each array will also be inherited, recursively, by any child
* Component of those Windows that has no such array of its own explicitly
* set.
*/
private Set<AWTKeyStroke>[] defaultFocusTraversalKeys = new Set[4];
/**
* The current focus cycle root. If the focus owner is itself a focus cycle
* root, then it may be ambiguous as to which Components represent the next
* and previous Components to focus during normal focus traversal. In that
* case, the current focus cycle root is used to differentiate among the
* possibilities.
*/
private static Container currentFocusCycleRoot;
/**
* A description of any VetoableChangeListeners which have been registered.
*/
private VetoableChangeSupport vetoableSupport;
/**
* A description of any PropertyChangeListeners which have been registered.
*/
private PropertyChangeSupport changeSupport;
/**
* This KeyboardFocusManager's KeyEventDispatcher chain. The List does not
* include this KeyboardFocusManager unless it was explicitly re-registered
* via a call to <code>addKeyEventDispatcher</code>. If no other
* KeyEventDispatchers are registered, this field may be null or refer to
* a List of length 0.
*/
private java.util.LinkedList<KeyEventDispatcher> keyEventDispatchers;
/**
* This KeyboardFocusManager's KeyEventPostProcessor chain. The List does
* not include this KeyboardFocusManager unless it was explicitly
* re-registered via a call to <code>addKeyEventPostProcessor</code>.
* If no other KeyEventPostProcessors are registered, this field may be
* null or refer to a List of length 0.
*/
private java.util.LinkedList<KeyEventPostProcessor> keyEventPostProcessors;
/**
* Maps Windows to those Windows' most recent focus owners.
*/
private static java.util.Map<Window, WeakReference<Component>> mostRecentFocusOwners = new WeakHashMap<>();
/**
* We cache the permission used to verify that the calling thread is
* permitted to access the global focus state.
*/
private static AWTPermission replaceKeyboardFocusManagerPermission;
/*
* SequencedEvent which is currently dispatched in AppContext.
*/
transient SequencedEvent currentSequencedEvent = null;
final void setCurrentSequencedEvent(SequencedEvent current) {
synchronized (SequencedEvent.class) {
assert(current == null || currentSequencedEvent == null);
currentSequencedEvent = current;
}
}
final SequencedEvent getCurrentSequencedEvent() {
synchronized (SequencedEvent.class) {
return currentSequencedEvent;
}
}
static Set<AWTKeyStroke> initFocusTraversalKeysSet(String value, Set<AWTKeyStroke> targetSet) {
StringTokenizer tokens = new StringTokenizer(value, ",");
while (tokens.hasMoreTokens()) {
targetSet.add(AWTKeyStroke.getAWTKeyStroke(tokens.nextToken()));
}
return (targetSet.isEmpty())
? Collections.EMPTY_SET
: Collections.unmodifiableSet(targetSet);
}
/**
* Initializes a KeyboardFocusManager.
*/
public KeyboardFocusManager() {
for (int i = 0; i < TRAVERSAL_KEY_LENGTH; i++) {
Set<AWTKeyStroke> work_set = new HashSet<>();
for (int j = 0; j < defaultFocusTraversalKeyStrokes[i].length; j++) {
work_set.add(defaultFocusTraversalKeyStrokes[i][j]);
}
defaultFocusTraversalKeys[i] = (work_set.isEmpty())
? Collections.EMPTY_SET
: Collections.unmodifiableSet(work_set);
}
initPeer();
}
private void initPeer() {
Toolkit tk = Toolkit.getDefaultToolkit();
KeyboardFocusManagerPeerProvider peerProvider = (KeyboardFocusManagerPeerProvider)tk;
peer = peerProvider.getKeyboardFocusManagerPeer();
}
/**
* Returns the focus owner, if the focus owner is in the same context as
* the calling thread. The focus owner is defined as the Component in an
* application that will typically receive all KeyEvents generated by the
* user. KeyEvents which map to the focus owner's focus traversal keys will
* not be delivered if focus traversal keys are enabled for the focus
* owner. In addition, KeyEventDispatchers may retarget or consume
* KeyEvents before they reach the focus owner.
*
* @return the focus owner, or null if the focus owner is not a member of
* the calling thread's context
* @see #getGlobalFocusOwner
* @see #setGlobalFocusOwner
*/
public Component getFocusOwner() {
synchronized (KeyboardFocusManager.class) {
if (focusOwner == null) {
return null;
}
return (focusOwner.appContext == AppContext.getAppContext())
? focusOwner
: null;
}
}
/**
* Returns the focus owner, even if the calling thread is in a different
* context than the focus owner. The focus owner is defined as the
* Component in an application that will typically receive all KeyEvents
* generated by the user. KeyEvents which map to the focus owner's focus
* traversal keys will not be delivered if focus traversal keys are enabled
* for the focus owner. In addition, KeyEventDispatchers may retarget or
* consume KeyEvents before they reach the focus owner.
* <p>
* This method will throw a SecurityException if this KeyboardFocusManager
* is not the current KeyboardFocusManager for the calling thread's
* context.
*
* @return the focus owner
* @see #getFocusOwner
* @see #setGlobalFocusOwner
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
*/
protected Component getGlobalFocusOwner() throws SecurityException {
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
return focusOwner;
}
}
/**
* Sets the focus owner. The operation will be cancelled if the Component
* is not focusable. The focus owner is defined as the Component in an
* application that will typically receive all KeyEvents generated by the
* user. KeyEvents which map to the focus owner's focus traversal keys will
* not be delivered if focus traversal keys are enabled for the focus
* owner. In addition, KeyEventDispatchers may retarget or consume
* KeyEvents before they reach the focus owner.
* <p>
* This method does not actually set the focus to the specified Component.
* It merely stores the value to be subsequently returned by
* <code>getFocusOwner()</code>. Use <code>Component.requestFocus()</code>
* or <code>Component.requestFocusInWindow()</code> to change the focus
* owner, subject to platform limitations.
*
* @param focusOwner the focus owner
* @see #getFocusOwner
* @see #getGlobalFocusOwner
* @see Component#requestFocus()
* @see Component#requestFocusInWindow()
* @see Component#isFocusable
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
* @beaninfo
* bound: true
*/
protected void setGlobalFocusOwner(Component focusOwner)
throws SecurityException
{
Component oldFocusOwner = null;
boolean shouldFire = false;
if (focusOwner == null || focusOwner.isFocusable()) {
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
oldFocusOwner = getFocusOwner();
try {
fireVetoableChange("focusOwner", oldFocusOwner,
focusOwner);
} catch (PropertyVetoException e) {
// rejected
return;
}
KeyboardFocusManager.focusOwner = focusOwner;
if (focusOwner != null &&
(getCurrentFocusCycleRoot() == null ||
!focusOwner.isFocusCycleRoot(getCurrentFocusCycleRoot())))
{
Container rootAncestor =
focusOwner.getFocusCycleRootAncestor();
if (rootAncestor == null && (focusOwner instanceof Window))
{
rootAncestor = (Container)focusOwner;
}
if (rootAncestor != null) {
setGlobalCurrentFocusCycleRootPriv(rootAncestor);
}
}
shouldFire = true;
}
}
if (shouldFire) {
firePropertyChange("focusOwner", oldFocusOwner, focusOwner);
}
}
/**
* Clears the focus owner at both the Java and native levels if the
* focus owner exists and resides in the same context as the calling thread,
* otherwise the method returns silently.
* <p>
* The focus owner component will receive a permanent FOCUS_LOST event.
* After this operation completes, the native windowing system will discard
* all user-generated KeyEvents until the user selects a new Component to
* receive focus, or a Component is given focus explicitly via a call to
* {@code requestFocus()}. This operation does not change the focused or
* active Windows.
*
* @see Component#requestFocus()
* @see java.awt.event.FocusEvent#FOCUS_LOST
* @since 1.8
*/
public void clearFocusOwner() {
if (getFocusOwner() != null) {
clearGlobalFocusOwner();
}
}
/**
* Clears the global focus owner at both the Java and native levels. If
* there exists a focus owner, that Component will receive a permanent
* FOCUS_LOST event. After this operation completes, the native windowing
* system will discard all user-generated KeyEvents until the user selects
* a new Component to receive focus, or a Component is given focus
* explicitly via a call to <code>requestFocus()</code>. This operation
* does not change the focused or active Windows.
* <p>
* If a SecurityManager is installed, the calling thread must be granted
* the "replaceKeyboardFocusManager" AWTPermission. If this permission is
* not granted, this method will throw a SecurityException, and the current
* focus owner will not be cleared.
* <p>
* This method is intended to be used only by KeyboardFocusManager set as
* current KeyboardFocusManager for the calling thread's context. It is not
* for general client use.
*
* @see KeyboardFocusManager#clearFocusOwner
* @see Component#requestFocus()
* @see java.awt.event.FocusEvent#FOCUS_LOST
* @throws SecurityException if the calling thread does not have
* "replaceKeyboardFocusManager" permission
*/
public void clearGlobalFocusOwner()
throws SecurityException
{
checkReplaceKFMPermission();
if (!GraphicsEnvironment.isHeadless()) {
// Toolkit must be fully initialized, otherwise
// _clearGlobalFocusOwner will crash or throw an exception
Toolkit.getDefaultToolkit();
_clearGlobalFocusOwner();
}
}
private void _clearGlobalFocusOwner() {
Window activeWindow = markClearGlobalFocusOwner();
peer.clearGlobalFocusOwner(activeWindow);
}
void clearGlobalFocusOwnerPriv() {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
public Void run() {
clearGlobalFocusOwner();
return null;
}
});
}
Component getNativeFocusOwner() {
return peer.getCurrentFocusOwner();
}
void setNativeFocusOwner(Component comp) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Calling peer {0} setCurrentFocusOwner for {1}",
String.valueOf(peer), String.valueOf(comp));
}
peer.setCurrentFocusOwner(comp);
}
Window getNativeFocusedWindow() {
return peer.getCurrentFocusedWindow();
}
/**
* Returns the permanent focus owner, if the permanent focus owner is in
* the same context as the calling thread. The permanent focus owner is
* defined as the last Component in an application to receive a permanent
* FOCUS_GAINED event. The focus owner and permanent focus owner are
* equivalent unless a temporary focus change is currently in effect. In
* such a situation, the permanent focus owner will again be the focus
* owner when the temporary focus change ends.
*
* @return the permanent focus owner, or null if the permanent focus owner
* is not a member of the calling thread's context
* @see #getGlobalPermanentFocusOwner
* @see #setGlobalPermanentFocusOwner
*/
public Component getPermanentFocusOwner() {
synchronized (KeyboardFocusManager.class) {
if (permanentFocusOwner == null) {
return null;
}
return (permanentFocusOwner.appContext ==
AppContext.getAppContext())
? permanentFocusOwner
: null;
}
}
/**
* Returns the permanent focus owner, even if the calling thread is in a
* different context than the permanent focus owner. The permanent focus
* owner is defined as the last Component in an application to receive a
* permanent FOCUS_GAINED event. The focus owner and permanent focus owner
* are equivalent unless a temporary focus change is currently in effect.
* In such a situation, the permanent focus owner will again be the focus
* owner when the temporary focus change ends.
*
* @return the permanent focus owner
* @see #getPermanentFocusOwner
* @see #setGlobalPermanentFocusOwner
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
*/
protected Component getGlobalPermanentFocusOwner()
throws SecurityException
{
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
return permanentFocusOwner;
}
}
/**
* Sets the permanent focus owner. The operation will be cancelled if the
* Component is not focusable. The permanent focus owner is defined as the
* last Component in an application to receive a permanent FOCUS_GAINED
* event. The focus owner and permanent focus owner are equivalent unless
* a temporary focus change is currently in effect. In such a situation,
* the permanent focus owner will again be the focus owner when the
* temporary focus change ends.
* <p>
* This method does not actually set the focus to the specified Component.
* It merely stores the value to be subsequently returned by
* <code>getPermanentFocusOwner()</code>. Use
* <code>Component.requestFocus()</code> or
* <code>Component.requestFocusInWindow()</code> to change the focus owner,
* subject to platform limitations.
*
* @param permanentFocusOwner the permanent focus owner
* @see #getPermanentFocusOwner
* @see #getGlobalPermanentFocusOwner
* @see Component#requestFocus()
* @see Component#requestFocusInWindow()
* @see Component#isFocusable
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
* @beaninfo
* bound: true
*/
protected void setGlobalPermanentFocusOwner(Component permanentFocusOwner)
throws SecurityException
{
Component oldPermanentFocusOwner = null;
boolean shouldFire = false;
if (permanentFocusOwner == null || permanentFocusOwner.isFocusable()) {
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
oldPermanentFocusOwner = getPermanentFocusOwner();
try {
fireVetoableChange("permanentFocusOwner",
oldPermanentFocusOwner,
permanentFocusOwner);
} catch (PropertyVetoException e) {
// rejected
return;
}
KeyboardFocusManager.permanentFocusOwner = permanentFocusOwner;
KeyboardFocusManager.
setMostRecentFocusOwner(permanentFocusOwner);
shouldFire = true;
}
}
if (shouldFire) {
firePropertyChange("permanentFocusOwner", oldPermanentFocusOwner,
permanentFocusOwner);
}
}
/**
* Returns the focused Window, if the focused Window is in the same context
* as the calling thread. The focused Window is the Window that is or
* contains the focus owner.
*
* @return the focused Window, or null if the focused Window is not a
* member of the calling thread's context
* @see #getGlobalFocusedWindow
* @see #setGlobalFocusedWindow
*/
public Window getFocusedWindow() {
synchronized (KeyboardFocusManager.class) {
if (focusedWindow == null) {
return null;
}
return (focusedWindow.appContext == AppContext.getAppContext())
? focusedWindow
: null;
}
}
/**
* Returns the focused Window, even if the calling thread is in a different
* context than the focused Window. The focused Window is the Window that
* is or contains the focus owner.
*
* @return the focused Window
* @see #getFocusedWindow
* @see #setGlobalFocusedWindow
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
*/
protected Window getGlobalFocusedWindow() throws SecurityException {
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
return focusedWindow;
}
}
/**
* Sets the focused Window. The focused Window is the Window that is or
* contains the focus owner. The operation will be cancelled if the
* specified Window to focus is not a focusable Window.
* <p>
* This method does not actually change the focused Window as far as the
* native windowing system is concerned. It merely stores the value to be
* subsequently returned by <code>getFocusedWindow()</code>. Use
* <code>Component.requestFocus()</code> or
* <code>Component.requestFocusInWindow()</code> to change the focused
* Window, subject to platform limitations.
*
* @param focusedWindow the focused Window
* @see #getFocusedWindow
* @see #getGlobalFocusedWindow
* @see Component#requestFocus()
* @see Component#requestFocusInWindow()
* @see Window#isFocusableWindow
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
* @beaninfo
* bound: true
*/
protected void setGlobalFocusedWindow(Window focusedWindow)
throws SecurityException
{
Window oldFocusedWindow = null;
boolean shouldFire = false;
if (focusedWindow == null || focusedWindow.isFocusableWindow()) {
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
oldFocusedWindow = getFocusedWindow();
try {
fireVetoableChange("focusedWindow", oldFocusedWindow,
focusedWindow);
} catch (PropertyVetoException e) {
// rejected
return;
}
KeyboardFocusManager.focusedWindow = focusedWindow;
shouldFire = true;
}
}
if (shouldFire) {
firePropertyChange("focusedWindow", oldFocusedWindow,
focusedWindow);
}
}
/**
* Returns the active Window, if the active Window is in the same context
* as the calling thread. Only a Frame or a Dialog can be the active
* Window. The native windowing system may denote the active Window or its
* children with special decorations, such as a highlighted title bar.
* The active Window is always either the focused Window, or the first
* Frame or Dialog that is an owner of the focused Window.
*
* @return the active Window, or null if the active Window is not a member
* of the calling thread's context
* @see #getGlobalActiveWindow
* @see #setGlobalActiveWindow
*/
public Window getActiveWindow() {
synchronized (KeyboardFocusManager.class) {
if (activeWindow == null) {
return null;
}
return (activeWindow.appContext == AppContext.getAppContext())
? activeWindow
: null;
}
}
/**
* Returns the active Window, even if the calling thread is in a different
* context than the active Window. Only a Frame or a Dialog can be the
* active Window. The native windowing system may denote the active Window
* or its children with special decorations, such as a highlighted title
* bar. The active Window is always either the focused Window, or the first
* Frame or Dialog that is an owner of the focused Window.
*
* @return the active Window
* @see #getActiveWindow
* @see #setGlobalActiveWindow
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
*/
protected Window getGlobalActiveWindow() throws SecurityException {
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
return activeWindow;
}
}
/**
* Sets the active Window. Only a Frame or a Dialog can be the active
* Window. The native windowing system may denote the active Window or its
* children with special decorations, such as a highlighted title bar. The
* active Window is always either the focused Window, or the first Frame or
* Dialog that is an owner of the focused Window.
* <p>
* This method does not actually change the active Window as far as the
* native windowing system is concerned. It merely stores the value to be
* subsequently returned by <code>getActiveWindow()</code>. Use
* <code>Component.requestFocus()</code> or
* <code>Component.requestFocusInWindow()</code>to change the active
* Window, subject to platform limitations.
*
* @param activeWindow the active Window
* @see #getActiveWindow
* @see #getGlobalActiveWindow
* @see Component#requestFocus()
* @see Component#requestFocusInWindow()
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
* @beaninfo
* bound: true
*/
protected void setGlobalActiveWindow(Window activeWindow)
throws SecurityException
{
Window oldActiveWindow;
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
oldActiveWindow = getActiveWindow();
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("Setting global active window to " + activeWindow + ", old active " + oldActiveWindow);
}
try {
fireVetoableChange("activeWindow", oldActiveWindow,
activeWindow);
} catch (PropertyVetoException e) {
// rejected
return;
}
KeyboardFocusManager.activeWindow = activeWindow;
}
firePropertyChange("activeWindow", oldActiveWindow, activeWindow);
}
/**
* Returns the default FocusTraversalPolicy. Top-level components
* use this value on their creation to initialize their own focus traversal
* policy by explicit call to Container.setFocusTraversalPolicy.
*
* @return the default FocusTraversalPolicy. null will never be returned.
* @see #setDefaultFocusTraversalPolicy
* @see Container#setFocusTraversalPolicy
* @see Container#getFocusTraversalPolicy
*/
public synchronized FocusTraversalPolicy getDefaultFocusTraversalPolicy() {
return defaultPolicy;
}
/**
* Sets the default FocusTraversalPolicy. Top-level components
* use this value on their creation to initialize their own focus traversal
* policy by explicit call to Container.setFocusTraversalPolicy.
* Note: this call doesn't affect already created components as they have
* their policy initialized. Only new components will use this policy as
* their default policy.
*
* @param defaultPolicy the new, default FocusTraversalPolicy
* @see #getDefaultFocusTraversalPolicy
* @see Container#setFocusTraversalPolicy
* @see Container#getFocusTraversalPolicy
* @throws IllegalArgumentException if defaultPolicy is null
* @beaninfo
* bound: true
*/
public void setDefaultFocusTraversalPolicy(FocusTraversalPolicy
defaultPolicy) {
if (defaultPolicy == null) {
throw new IllegalArgumentException("default focus traversal policy cannot be null");
}
FocusTraversalPolicy oldPolicy;
synchronized (this) {
oldPolicy = this.defaultPolicy;
this.defaultPolicy = defaultPolicy;
}
firePropertyChange("defaultFocusTraversalPolicy", oldPolicy,
defaultPolicy);
}
/**
* Sets the default focus traversal keys for a given traversal operation.
* This traversal key {@code Set} will be in effect on all
* {@code Window}s that have no such {@code Set} of
* their own explicitly defined. This {@code Set} will also be
* inherited, recursively, by any child {@code Component} of
* those {@code Windows} that has
* no such {@code Set} of its own explicitly defined.
* <p>
* The default values for the default 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 focus traversal keys">
* <tr>
* <th>Identifier</th>
* <th>Meaning</th>
* <th>Default</th>
* </tr>
* <tr>
* <td>{@code KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS}</td>
* <td>Normal forward keyboard traversal</td>
* <td>{@code TAB} on {@code KEY_PRESSED},
* {@code CTRL-TAB} on {@code KEY_PRESSED}</td>
* </tr>
* <tr>
* <td>{@code KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS}</td>
* <td>Normal reverse keyboard traversal</td>
* <td>{@code SHIFT-TAB} on {@code KEY_PRESSED},
* {@code CTRL-SHIFT-TAB} on {@code KEY_PRESSED}</td>
* </tr>
* <tr>
* <td>{@code KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS}</td>
* <td>Go up one focus traversal cycle</td>
* <td>none</td>
* </tr>
* <tr>
* <td>{@code KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS}</td>
* <td>Go down one focus traversal cycle</td>
* <td>none</td>
* </tr>
* </table>
*
* To disable a traversal key, use an empty {@code Set};
* {@code Collections.EMPTY_SET} is recommended.
* <p>
* Using the {@code AWTKeyStroke} API, client code can
* specify on which of two
* specific {@code KeyEvent}s, {@code KEY_PRESSED} or
* {@code KEY_RELEASED}, the focus traversal operation will
* occur. Regardless of which {@code KeyEvent} is specified,
* however, all {@code KeyEvent}s related to the focus
* traversal key, including the associated {@code KEY_TYPED}
* event, will be consumed, and will not be dispatched
* to any {@code Component}. It is a runtime error to
* specify a {@code KEY_TYPED} event as
* mapping to a focus traversal operation, or to map the same event to
* multiple default focus traversal operations.
* <p>
* This method may throw a {@code ClassCastException} if any {@code Object}
* in {@code keystrokes} is not an {@code AWTKeyStroke}.
*
* @param id one of
* {@code KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS},
* {@code KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS},
* {@code KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS}, or
* {@code KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS}
* @param keystrokes the Set of {@code AWTKeyStroke}s for the
* specified operation
* @see #getDefaultFocusTraversalKeys
* @see Component#setFocusTraversalKeys
* @see Component#getFocusTraversalKeys
* @throws IllegalArgumentException if id is not one of
* {@code KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS},
* {@code KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS},
* {@code KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS}, or
* {@code KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS},
* or if keystrokes is {@code null},
* or if keystrokes contains {@code null},
* or if any keystroke
* represents a {@code KEY_TYPED} event,
* or if any keystroke already maps
* to another default focus traversal operation
* @beaninfo
* bound: true
*/
public void
setDefaultFocusTraversalKeys(int id,
Set<? extends AWTKeyStroke> keystrokes)
{
if (id < 0 || id >= TRAVERSAL_KEY_LENGTH) {
throw new IllegalArgumentException("invalid focus traversal key identifier");
}
if (keystrokes == null) {
throw new IllegalArgumentException("cannot set null Set of default focus traversal keys");
}
Set<AWTKeyStroke> oldKeys;
synchronized (this) {
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");
}
// Check to see if key already maps to another traversal
// operation
for (int i = 0; i < TRAVERSAL_KEY_LENGTH; i++) {
if (i == id) {
continue;
}
if (defaultFocusTraversalKeys[i].contains(keystroke)) {
throw new IllegalArgumentException("focus traversal keys must be unique for a Component");
}
}
}
oldKeys = defaultFocusTraversalKeys[id];
defaultFocusTraversalKeys[id] =
Collections.unmodifiableSet(new HashSet<>(keystrokes));
}
firePropertyChange(defaultFocusTraversalKeyPropertyNames[id],
oldKeys, keystrokes);
}
/**
* Returns a Set of default focus traversal keys for a given traversal
* operation. This traversal key Set will be in effect on all Windows that
* have no such Set of their own explicitly defined. This Set will also be
* inherited, recursively, by any child Component of those Windows that has
* no such Set of its own explicitly defined. (See
* <code>setDefaultFocusTraversalKeys</code> for a full description of each
* operation.)
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or
* KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS
* @return the <code>Set</code> of <code>AWTKeyStroke</code>s
* for the specified operation; the <code>Set</code>
* will be unmodifiable, and may be empty; <code>null</code>
* will never be returned
* @see #setDefaultFocusTraversalKeys
* @see Component#setFocusTraversalKeys
* @see Component#getFocusTraversalKeys
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or
* KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS
*/
public Set<AWTKeyStroke> getDefaultFocusTraversalKeys(int id) {
if (id < 0 || id >= TRAVERSAL_KEY_LENGTH) {
throw new IllegalArgumentException("invalid focus traversal key identifier");
}
// Okay to return Set directly because it is an unmodifiable view
return defaultFocusTraversalKeys[id];
}
/**
* Returns the current focus cycle root, if the current focus cycle root is
* in the same context as the calling thread. If the focus owner is itself
* a focus cycle root, then it may be ambiguous as to which Components
* represent the next and previous Components to focus during normal focus
* traversal. In that case, the current focus cycle root is used to
* differentiate among the possibilities.
* <p>
* This method is intended to be used only by KeyboardFocusManagers and
* focus implementations. It is not for general client use.
*
* @return the current focus cycle root, or null if the current focus cycle
* root is not a member of the calling thread's context
* @see #getGlobalCurrentFocusCycleRoot
* @see #setGlobalCurrentFocusCycleRoot
*/
public Container getCurrentFocusCycleRoot() {
synchronized (KeyboardFocusManager.class) {
if (currentFocusCycleRoot == null) {
return null;
}
return (currentFocusCycleRoot.appContext ==
AppContext.getAppContext())
? currentFocusCycleRoot
: null;
}
}
/**
* Returns the current focus cycle root, even if the calling thread is in a
* different context than the current focus cycle root. If the focus owner
* is itself a focus cycle root, then it may be ambiguous as to which
* Components represent the next and previous Components to focus during
* normal focus traversal. In that case, the current focus cycle root is
* used to differentiate among the possibilities.
*
* @return the current focus cycle root, or null if the current focus cycle
* root is not a member of the calling thread's context
* @see #getCurrentFocusCycleRoot
* @see #setGlobalCurrentFocusCycleRoot
* @throws SecurityException if this KeyboardFocusManager is not the
* current KeyboardFocusManager for the calling thread's context
* and if the calling thread does not have "replaceKeyboardFocusManager"
* permission
*/
protected Container getGlobalCurrentFocusCycleRoot()
throws SecurityException
{
synchronized (KeyboardFocusManager.class) {
checkKFMSecurity();
return currentFocusCycleRoot;
}
}
/**
* Sets the current focus cycle root. If the focus owner is itself a focus
* cycle root, then it may be ambiguous as to which Components represent
* the next and previous Components to focus during normal focus traversal.
* In that case, the current focus cycle root is used to differentiate
* among the possibilities.
* <p>
* If a SecurityManager is installed, the calling thread must be granted
* the "replaceKeyboardFocusManager" AWTPermission. If this permission is
* not granted, this method will throw a SecurityException, and the current
* focus cycle root will not be changed.
* <p>
* This method is intended to be used only by KeyboardFocusManagers and
* focus implementations. It is not for general client use.
*
* @param newFocusCycleRoot the new focus cycle root
* @see #getCurrentFocusCycleRoot
* @see #getGlobalCurrentFocusCycleRoot
* @throws SecurityException if the calling thread does not have
* "replaceKeyboardFocusManager" permission
* @beaninfo
* bound: true
*/
public void setGlobalCurrentFocusCycleRoot(Container newFocusCycleRoot)
throws SecurityException
{
checkReplaceKFMPermission();
Container oldFocusCycleRoot;
synchronized (KeyboardFocusManager.class) {
oldFocusCycleRoot = getCurrentFocusCycleRoot();
currentFocusCycleRoot = newFocusCycleRoot;
}
firePropertyChange("currentFocusCycleRoot", oldFocusCycleRoot,
newFocusCycleRoot);
}
void setGlobalCurrentFocusCycleRootPriv(final Container newFocusCycleRoot) {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
public Void run() {
setGlobalCurrentFocusCycleRoot(newFocusCycleRoot);
return null;
}
});
}
/**
* Adds a PropertyChangeListener to the listener list. The listener is
* registered for all bound properties of this class, including the
* following:
* <ul>
* <li>whether the KeyboardFocusManager is currently managing focus
* for this application or applet's browser context
* ("managingFocus")</li>
* <li>the focus owner ("focusOwner")</li>
* <li>the permanent focus owner ("permanentFocusOwner")</li>
* <li>the focused Window ("focusedWindow")</li>
* <li>the active Window ("activeWindow")</li>
* <li>the default focus traversal policy
* ("defaultFocusTraversalPolicy")</li>
* <li>the Set of default FORWARD_TRAVERSAL_KEYS
* ("forwardDefaultFocusTraversalKeys")</li>
* <li>the Set of default BACKWARD_TRAVERSAL_KEYS
* ("backwardDefaultFocusTraversalKeys")</li>
* <li>the Set of default UP_CYCLE_TRAVERSAL_KEYS
* ("upCycleDefaultFocusTraversalKeys")</li>
* <li>the Set of default DOWN_CYCLE_TRAVERSAL_KEYS
* ("downCycleDefaultFocusTraversalKeys")</li>
* <li>the current focus cycle root ("currentFocusCycleRoot")</li>
* </ul>
* If listener is null, no exception is thrown and no action is performed.
*
* @param listener the PropertyChangeListener to be added
* @see #removePropertyChangeListener
* @see #getPropertyChangeListeners
* @see #addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
if (listener != null) {
synchronized (this) {
if (changeSupport == null) {
changeSupport = new PropertyChangeSupport(this);
}
changeSupport.addPropertyChangeListener(listener);
}
}
}
/**
* Removes a PropertyChangeListener from the listener list. This method
* should be used to remove the 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) {
if (listener != null) {
synchronized (this) {
if (changeSupport != null) {
changeSupport.removePropertyChangeListener(listener);
}
}
}
}
/**
* Returns an array of all the property change listeners
* registered on this keyboard focus manager.
*
* @return all of this keyboard focus manager'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)
* @since 1.4
*/
public synchronized PropertyChangeListener[] getPropertyChangeListeners() {
if (changeSupport == null) {
changeSupport = new PropertyChangeSupport(this);
}
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>whether the KeyboardFocusManager is currently managing focus
* for this application or applet's browser context
* ("managingFocus")</li>
* <li>the focus owner ("focusOwner")</li>
* <li>the permanent focus owner ("permanentFocusOwner")</li>
* <li>the focused Window ("focusedWindow")</li>
* <li>the active Window ("activeWindow")</li>
* <li>the default focus traversal policy
* ("defaultFocusTraversalPolicy")</li>
* <li>the Set of default FORWARD_TRAVERSAL_KEYS
* ("forwardDefaultFocusTraversalKeys")</li>
* <li>the Set of default BACKWARD_TRAVERSAL_KEYS
* ("backwardDefaultFocusTraversalKeys")</li>
* <li>the Set of default UP_CYCLE_TRAVERSAL_KEYS
* ("upCycleDefaultFocusTraversalKeys")</li>
* <li>the Set of default DOWN_CYCLE_TRAVERSAL_KEYS
* ("downCycleDefaultFocusTraversalKeys")</li>
* <li>the current focus cycle root ("currentFocusCycleRoot")</li>
* </ul>
* If listener is null, no exception is thrown and no action is performed.
*
* @param propertyName one of the property names listed above
* @param listener the PropertyChangeListener to be added
* @see #addPropertyChangeListener(java.beans.PropertyChangeListener)
* @see #removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
* @see #getPropertyChangeListeners(java.lang.String)
*/
public void addPropertyChangeListener(String propertyName,
PropertyChangeListener listener) {
if (listener != null) {
synchronized (this) {
if (changeSupport == null) {
changeSupport = new PropertyChangeSupport(this);
}
changeSupport.addPropertyChangeListener(propertyName,
listener);
}
}
}
/**
* Removes a PropertyChangeListener from the listener list for a specific
* property. This method should be used to remove PropertyChangeListeners
* that were registered for a specific bound property.
* <p>
* If listener is null, no exception is thrown and no action is performed.
*
* @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) {
if (listener != null) {
synchronized (this) {
if (changeSupport != null) {
changeSupport.removePropertyChangeListener(propertyName,
listener);
}
}
}
}
/**
* Returns an array of all the <code>PropertyChangeListener</code>s
* associated with the named property.
*
* @return all of the <code>PropertyChangeListener</code>s associated with
* the named property or an empty array if no such listeners have
* been added.
*
* @see #addPropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
* @see #removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
* @since 1.4
*/
public synchronized PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
if (changeSupport == null) {
changeSupport = new PropertyChangeSupport(this);
}
return changeSupport.getPropertyChangeListeners(propertyName);
}
/**
* Fires a PropertyChangeEvent in response to a change in a bound property.
* The event will be delivered to all registered PropertyChangeListeners.
* No event will be delivered if oldValue and newValue are the same.
*
* @param propertyName the name of the property that 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)
{
if (oldValue == newValue) {
return;
}
PropertyChangeSupport changeSupport = this.changeSupport;
if (changeSupport != null) {
changeSupport.firePropertyChange(propertyName, oldValue, newValue);
}
}
/**
* Adds a VetoableChangeListener to the listener list. The listener is
* registered for all vetoable properties of this class, including the
* following:
* <ul>
* <li>the focus owner ("focusOwner")</li>
* <li>the permanent focus owner ("permanentFocusOwner")</li>
* <li>the focused Window ("focusedWindow")</li>
* <li>the active Window ("activeWindow")</li>
* </ul>
* If listener is null, no exception is thrown and no action is performed.
*
* @param listener the VetoableChangeListener to be added
* @see #removeVetoableChangeListener
* @see #getVetoableChangeListeners
* @see #addVetoableChangeListener(java.lang.String,java.beans.VetoableChangeListener)
*/
public void addVetoableChangeListener(VetoableChangeListener listener) {
if (listener != null) {
synchronized (this) {
if (vetoableSupport == null) {
vetoableSupport =
new VetoableChangeSupport(this);
}
vetoableSupport.addVetoableChangeListener(listener);
}
}
}
/**
* Removes a VetoableChangeListener from the listener list. This method
* should be used to remove the VetoableChangeListeners that were
* registered for all vetoable properties of this class.
* <p>
* If listener is null, no exception is thrown and no action is performed.
*
* @param listener the VetoableChangeListener to be removed
* @see #addVetoableChangeListener
* @see #getVetoableChangeListeners
* @see #removeVetoableChangeListener(java.lang.String,java.beans.VetoableChangeListener)
*/
public void removeVetoableChangeListener(VetoableChangeListener listener) {
if (listener != null) {
synchronized (this) {
if (vetoableSupport != null) {
vetoableSupport.removeVetoableChangeListener(listener);
}
}
}
}
/**
* Returns an array of all the vetoable change listeners
* registered on this keyboard focus manager.
*
* @return all of this keyboard focus manager's
* <code>VetoableChangeListener</code>s
* or an empty array if no vetoable change
* listeners are currently registered
*
* @see #addVetoableChangeListener
* @see #removeVetoableChangeListener
* @see #getVetoableChangeListeners(java.lang.String)
* @since 1.4
*/
public synchronized VetoableChangeListener[] getVetoableChangeListeners() {
if (vetoableSupport == null) {
vetoableSupport = new VetoableChangeSupport(this);
}
return vetoableSupport.getVetoableChangeListeners();
}
/**
* Adds a VetoableChangeListener to the listener list for a specific
* property. The specified property may be user-defined, or one of the
* following:
* <ul>
* <li>the focus owner ("focusOwner")</li>
* <li>the permanent focus owner ("permanentFocusOwner")</li>
* <li>the focused Window ("focusedWindow")</li>
* <li>the active Window ("activeWindow")</li>
* </ul>
* If listener is null, no exception is thrown and no action is performed.
*
* @param propertyName one of the property names listed above
* @param listener the VetoableChangeListener to be added
* @see #addVetoableChangeListener(java.beans.VetoableChangeListener)
* @see #removeVetoableChangeListener
* @see #getVetoableChangeListeners
*/
public void addVetoableChangeListener(String propertyName,
VetoableChangeListener listener) {
if (listener != null) {
synchronized (this) {
if (vetoableSupport == null) {
vetoableSupport =
new VetoableChangeSupport(this);
}
vetoableSupport.addVetoableChangeListener(propertyName,
listener);
}
}
}
/**
* Removes a VetoableChangeListener from the listener list for a specific
* property. This method should be used to remove VetoableChangeListeners
* that were registered for a specific bound property.
* <p>
* If listener is null, no exception is thrown and no action is performed.
*
* @param propertyName a valid property name
* @param listener the VetoableChangeListener to be removed
* @see #addVetoableChangeListener
* @see #getVetoableChangeListeners
* @see #removeVetoableChangeListener(java.beans.VetoableChangeListener)
*/
public void removeVetoableChangeListener(String propertyName,
VetoableChangeListener listener) {
if (listener != null) {
synchronized (this) {
if (vetoableSupport != null) {
vetoableSupport.removeVetoableChangeListener(propertyName,
listener);
}
}
}
}
/**
* Returns an array of all the <code>VetoableChangeListener</code>s
* associated with the named property.
*
* @return all of the <code>VetoableChangeListener</code>s associated with
* the named property or an empty array if no such listeners have
* been added.
*
* @see #addVetoableChangeListener(java.lang.String,java.beans.VetoableChangeListener)
* @see #removeVetoableChangeListener(java.lang.String,java.beans.VetoableChangeListener)
* @see #getVetoableChangeListeners
* @since 1.4
*/
public synchronized VetoableChangeListener[] getVetoableChangeListeners(String propertyName) {
if (vetoableSupport == null) {
vetoableSupport = new VetoableChangeSupport(this);
}
return vetoableSupport.getVetoableChangeListeners(propertyName);
}
/**
* Fires a PropertyChangeEvent in response to a change in a vetoable
* property. The event will be delivered to all registered
* VetoableChangeListeners. If a VetoableChangeListener throws a
* PropertyVetoException, a new event is fired reverting all
* VetoableChangeListeners to the old value and the exception is then
* rethrown. No event will be delivered if oldValue and newValue are the
* same.
*
* @param propertyName the name of the property that has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
* @throws java.beans.PropertyVetoException if a
* <code>VetoableChangeListener</code> threw
* <code>PropertyVetoException</code>
*/
protected void fireVetoableChange(String propertyName, Object oldValue,
Object newValue)
throws PropertyVetoException
{
if (oldValue == newValue) {
return;
}
VetoableChangeSupport vetoableSupport =
this.vetoableSupport;
if (vetoableSupport != null) {
vetoableSupport.fireVetoableChange(propertyName, oldValue,
newValue);
}
}
/**
* Adds a KeyEventDispatcher to this KeyboardFocusManager's dispatcher
* chain. This KeyboardFocusManager will request that each
* KeyEventDispatcher dispatch KeyEvents generated by the user before
* finally dispatching the KeyEvent itself. KeyEventDispatchers will be
* notified in the order in which they were added. Notifications will halt
* as soon as one KeyEventDispatcher returns <code>true</code> from its
* <code>dispatchKeyEvent</code> method. There is no limit to the total
* number of KeyEventDispatchers which can be added, nor to the number of
* times which a particular KeyEventDispatcher instance can be added.
* <p>
* If a null dispatcher is specified, no action is taken and no exception
* is thrown.
* <p>
* In a multithreaded application, {@link KeyEventDispatcher} behaves
* the same as other AWT listeners. See
* <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for more details.
*
* @param dispatcher the KeyEventDispatcher to add to the dispatcher chain
* @see #removeKeyEventDispatcher
*/
public void addKeyEventDispatcher(KeyEventDispatcher dispatcher) {
if (dispatcher != null) {
synchronized (this) {
if (keyEventDispatchers == null) {
keyEventDispatchers = new java.util.LinkedList<>();
}
keyEventDispatchers.add(dispatcher);
}
}
}
/**
* Removes a KeyEventDispatcher which was previously added to this
* KeyboardFocusManager's dispatcher chain. This KeyboardFocusManager
* cannot itself be removed, unless it was explicitly re-registered via a
* call to <code>addKeyEventDispatcher</code>.
* <p>
* If a null dispatcher is specified, if the specified dispatcher is not
* in the dispatcher chain, or if this KeyboardFocusManager is specified
* without having been explicitly re-registered, no action is taken and no
* exception is thrown.
* <p>
* In a multithreaded application, {@link KeyEventDispatcher} behaves
* the same as other AWT listeners. See
* <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for more details.
*
* @param dispatcher the KeyEventDispatcher to remove from the dispatcher
* chain
* @see #addKeyEventDispatcher
*/
public void removeKeyEventDispatcher(KeyEventDispatcher dispatcher) {
if (dispatcher != null) {
synchronized (this) {
if (keyEventDispatchers != null) {
keyEventDispatchers.remove(dispatcher);
}
}
}
}
/**
* Returns this KeyboardFocusManager's KeyEventDispatcher chain as a List.
* The List will not include this KeyboardFocusManager unless it was
* explicitly re-registered via a call to
* <code>addKeyEventDispatcher</code>. If no other KeyEventDispatchers are
* registered, implementations are free to return null or a List of length
* 0. Client code should not assume one behavior over another, nor should
* it assume that the behavior, once established, will not change.
*
* @return a possibly null or empty List of KeyEventDispatchers
* @see #addKeyEventDispatcher
* @see #removeKeyEventDispatcher
*/
protected synchronized java.util.List<KeyEventDispatcher>
getKeyEventDispatchers()
{
return (keyEventDispatchers != null)
? (java.util.List)keyEventDispatchers.clone()
: null;
}
/**
* Adds a KeyEventPostProcessor to this KeyboardFocusManager's post-
* processor chain. After a KeyEvent has been dispatched to and handled by
* its target, KeyboardFocusManager will request that each
* KeyEventPostProcessor perform any necessary post-processing as part
* of the KeyEvent's final resolution. KeyEventPostProcessors
* will be notified in the order in which they were added; the current
* KeyboardFocusManager will be notified last. Notifications will halt
* as soon as one KeyEventPostProcessor returns <code>true</code> from its
* <code>postProcessKeyEvent</code> method. There is no limit to the the
* total number of KeyEventPostProcessors that can be added, nor to the
* number of times that a particular KeyEventPostProcessor instance can be
* added.
* <p>
* If a null post-processor is specified, no action is taken and no
* exception is thrown.
* <p>
* In a multithreaded application, {@link KeyEventPostProcessor} behaves
* the same as other AWT listeners. See
* <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for more details.
*
* @param processor the KeyEventPostProcessor to add to the post-processor
* chain
* @see #removeKeyEventPostProcessor
*/
public void addKeyEventPostProcessor(KeyEventPostProcessor processor) {
if (processor != null) {
synchronized (this) {
if (keyEventPostProcessors == null) {
keyEventPostProcessors = new java.util.LinkedList<>();
}
keyEventPostProcessors.add(processor);
}
}
}
/**
* Removes a previously added KeyEventPostProcessor from this
* KeyboardFocusManager's post-processor chain. This KeyboardFocusManager
* cannot itself be entirely removed from the chain. Only additional
* references added via <code>addKeyEventPostProcessor</code> can be
* removed.
* <p>
* If a null post-processor is specified, if the specified post-processor
* is not in the post-processor chain, or if this KeyboardFocusManager is
* specified without having been explicitly added, no action is taken and
* no exception is thrown.
* <p>
* In a multithreaded application, {@link KeyEventPostProcessor} behaves
* the same as other AWT listeners. See
* <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for more details.
*
* @param processor the KeyEventPostProcessor to remove from the post-
* processor chain
* @see #addKeyEventPostProcessor
*/
public void removeKeyEventPostProcessor(KeyEventPostProcessor processor) {
if (processor != null) {
synchronized (this) {
if (keyEventPostProcessors != null) {
keyEventPostProcessors.remove(processor);
}
}
}
}
/**
* Returns this KeyboardFocusManager's KeyEventPostProcessor chain as a
* List. The List will not include this KeyboardFocusManager unless it was
* explicitly added via a call to <code>addKeyEventPostProcessor</code>. If
* no KeyEventPostProcessors are registered, implementations are free to
* return null or a List of length 0. Client code should not assume one
* behavior over another, nor should it assume that the behavior, once
* established, will not change.
*
* @return a possibly null or empty List of KeyEventPostProcessors
* @see #addKeyEventPostProcessor
* @see #removeKeyEventPostProcessor
*/
protected java.util.List<KeyEventPostProcessor>
getKeyEventPostProcessors()
{
return (keyEventPostProcessors != null)
? (java.util.List)keyEventPostProcessors.clone()
: null;
}
static void setMostRecentFocusOwner(Component component) {
Component window = component;
while (window != null && !(window instanceof Window)) {
window = window.parent;
}
if (window != null) {
setMostRecentFocusOwner((Window)window, component);
}
}
static synchronized void setMostRecentFocusOwner(Window window,
Component component) {
// ATTN: component has a strong reference to window via chain
// of Component.parent fields. Since WeakHasMap refers to its
// values strongly, we need to break the strong link from the
// value (component) back to its key (window).
WeakReference<Component> weakValue = null;
if (component != null) {
weakValue = new WeakReference<>(component);
}
mostRecentFocusOwners.put(window, weakValue);
}
static void clearMostRecentFocusOwner(Component comp) {
Container window;
if (comp == null) {
return;
}
synchronized (comp.getTreeLock()) {
window = comp.getParent();
while (window != null && !(window instanceof Window)) {
window = window.getParent();
}
}
synchronized (KeyboardFocusManager.class) {
if ((window != null)
&& (getMostRecentFocusOwner((Window)window) == comp))
{
setMostRecentFocusOwner((Window)window, null);
}
// Also clear temporary lost component stored in Window
if (window != null) {
Window realWindow = (Window)window;
if (realWindow.getTemporaryLostComponent() == comp) {
realWindow.setTemporaryLostComponent(null);
}
}
}
}
/*
* Please be careful changing this method! It is called from
* javax.swing.JComponent.runInputVerifier() using reflection.
*/
static synchronized Component getMostRecentFocusOwner(Window window) {
WeakReference<Component> weakValue =
(WeakReference)mostRecentFocusOwners.get(window);
return weakValue == null ? null : (Component)weakValue.get();
}
/**
* This method is called by the AWT event dispatcher requesting that the
* current KeyboardFocusManager dispatch the specified event on its behalf.
* It is expected that all KeyboardFocusManagers will dispatch all
* FocusEvents, all WindowEvents related to focus, and all KeyEvents.
* These events should be dispatched based on the KeyboardFocusManager's
* notion of the focus owner and the focused and active Windows, sometimes
* overriding the source of the specified AWTEvent. Dispatching must be
* done using <code>redispatchEvent</code> to prevent the AWT event
* dispatcher from recursively requesting that the KeyboardFocusManager
* dispatch the event again. If this method returns <code>false</code>,
* then the AWT event dispatcher will attempt to dispatch the event itself.
*
* @param e the AWTEvent to be dispatched
* @return <code>true</code> if this method dispatched the event;
* <code>false</code> otherwise
* @see #redispatchEvent
* @see #dispatchKeyEvent
*/
public abstract boolean dispatchEvent(AWTEvent e);
/**
* Redispatches an AWTEvent in such a way that the AWT event dispatcher
* will not recursively request that the KeyboardFocusManager, or any
* installed KeyEventDispatchers, dispatch the event again. Client
* implementations of <code>dispatchEvent</code> and client-defined
* KeyEventDispatchers must call <code>redispatchEvent(target, e)</code>
* instead of <code>target.dispatchEvent(e)</code> to dispatch an event.
* <p>
* This method is intended to be used only by KeyboardFocusManagers and
* KeyEventDispatchers. It is not for general client use.
*
* @param target the Component to which the event should be dispatched
* @param e the event to dispatch
* @see #dispatchEvent
* @see KeyEventDispatcher
*/
public final void redispatchEvent(Component target, AWTEvent e) {
e.focusManagerIsDispatching = true;
target.dispatchEvent(e);
e.focusManagerIsDispatching = false;
}
/**
* Typically this method will be called by <code>dispatchEvent</code> if no
* other KeyEventDispatcher in the dispatcher chain dispatched the
* KeyEvent, or if no other KeyEventDispatchers are registered. If an
* implementation of this method returns <code>false</code>,
* <code>dispatchEvent</code> may try to dispatch the KeyEvent itself, or
* may simply return <code>false</code>. If <code>true</code> is returned,
* <code>dispatchEvent</code> should return <code>true</code> as well.
*
* @param e the KeyEvent which the current KeyboardFocusManager has
* requested that this KeyEventDispatcher dispatch
* @return <code>true</code> if the KeyEvent was dispatched;
* <code>false</code> otherwise
* @see #dispatchEvent
*/
public abstract boolean dispatchKeyEvent(KeyEvent e);
/**
* This method will be called by <code>dispatchKeyEvent</code>.
* By default, this method will handle any unconsumed KeyEvents that
* map to an AWT <code>MenuShortcut</code> by consuming the event
* and activating the shortcut.
*
* @param e the KeyEvent to post-process
* @return <code>true</code> to indicate that no other
* KeyEventPostProcessor will be notified of the KeyEvent.
* @see #dispatchKeyEvent
* @see MenuShortcut
*/
public abstract boolean postProcessKeyEvent(KeyEvent e);
/**
* This method initiates a focus traversal operation if and only if the
* KeyEvent represents a focus traversal key for the specified
* focusedComponent. It is expected that focusedComponent is the current
* focus owner, although this need not be the case. If it is not,
* focus traversal will nevertheless proceed as if focusedComponent
* were the current focus owner.
*
* @param focusedComponent the Component that will be the basis for a focus
* traversal operation if the specified event represents a focus
* traversal key for the Component
* @param e the event that may represent a focus traversal key
*/
public abstract void processKeyEvent(Component focusedComponent,
KeyEvent e);
/**
* Called by the AWT to notify the KeyboardFocusManager that it should
* delay dispatching of KeyEvents until the specified Component becomes
* the focus owner. If client code requests a focus change, and the AWT
* determines that this request might be granted by the native windowing
* system, then the AWT will call this method. It is the responsibility of
* the KeyboardFocusManager to delay dispatching of KeyEvents with
* timestamps later than the specified time stamp until the specified
* Component receives a FOCUS_GAINED event, or the AWT cancels the delay
* request by invoking <code>dequeueKeyEvents</code> or
* <code>discardKeyEvents</code>.
*
* @param after timestamp of current event, or the current, system time if
* the current event has no timestamp, or the AWT cannot determine
* which event is currently being handled
* @param untilFocused Component which should receive a FOCUS_GAINED event
* before any pending KeyEvents
* @see #dequeueKeyEvents
* @see #discardKeyEvents
*/
protected abstract void enqueueKeyEvents(long after,
Component untilFocused);
/**
* Called by the AWT to notify the KeyboardFocusManager that it should
* cancel delayed dispatching of KeyEvents. All KeyEvents which were
* enqueued because of a call to <code>enqueueKeyEvents</code> with the
* same timestamp and Component should be released for normal dispatching
* to the current focus owner. If the given timestamp is less than zero,
* the outstanding enqueue request for the given Component with the <b>
* oldest</b> timestamp (if any) should be cancelled.
*
* @param after the timestamp specified in the call to
* <code>enqueueKeyEvents</code>, or any value < 0
* @param untilFocused the Component specified in the call to
* <code>enqueueKeyEvents</code>
* @see #enqueueKeyEvents
* @see #discardKeyEvents
*/
protected abstract void dequeueKeyEvents(long after,
Component untilFocused);
/**
* Called by the AWT to notify the KeyboardFocusManager that it should
* cancel delayed dispatching of KeyEvents. All KeyEvents which were
* enqueued because of one or more calls to <code>enqueueKeyEvents</code>
* with the same Component should be discarded.
*
* @param comp the Component specified in one or more calls to
* <code>enqueueKeyEvents</code>
* @see #enqueueKeyEvents
* @see #dequeueKeyEvents
*/
protected abstract void discardKeyEvents(Component comp);
/**
* Focuses the Component after aComponent, typically based on a
* FocusTraversalPolicy.
*
* @param aComponent the Component that is the basis for the focus
* traversal operation
* @see FocusTraversalPolicy
*/
public abstract void focusNextComponent(Component aComponent);
/**
* Focuses the Component before aComponent, typically based on a
* FocusTraversalPolicy.
*
* @param aComponent the Component that is the basis for the focus
* traversal operation
* @see FocusTraversalPolicy
*/
public abstract void focusPreviousComponent(Component aComponent);
/**
* Moves the focus up one focus traversal cycle. Typically, the focus owner
* is set to aComponent's focus cycle root, and the current focus cycle
* root is set to the new focus owner's focus cycle root. If, however,
* aComponent's focus cycle root is a Window, then typically the focus
* owner is set to the Window's default Component to focus, and the current
* focus cycle root is unchanged.
*
* @param aComponent the Component that is the basis for the focus
* traversal operation
*/
public abstract void upFocusCycle(Component aComponent);
/**
* Moves the focus down one focus traversal cycle. Typically, if
* aContainer is a focus cycle root, then the focus owner is set to
* aContainer's default Component to focus, and the current focus cycle
* root is set to aContainer. If aContainer is not a focus cycle root, then
* no focus traversal operation occurs.
*
* @param aContainer the Container that is the basis for the focus
* traversal operation
*/
public abstract void downFocusCycle(Container aContainer);
/**
* Focuses the Component after the current focus owner.
*/
public final void focusNextComponent() {
Component focusOwner = getFocusOwner();
if (focusOwner != null) {
focusNextComponent(focusOwner);
}
}
/**
* Focuses the Component before the current focus owner.
*/
public final void focusPreviousComponent() {
Component focusOwner = getFocusOwner();
if (focusOwner != null) {
focusPreviousComponent(focusOwner);
}
}
/**
* Moves the focus up one focus traversal cycle from the current focus
* owner. Typically, the new focus owner is set to the current focus
* owner's focus cycle root, and the current focus cycle root is set to the
* new focus owner's focus cycle root. If, however, the current focus
* owner's focus cycle root is a Window, then typically the focus owner is
* set to the focus cycle root's default Component to focus, and the
* current focus cycle root is unchanged.
*/
public final void upFocusCycle() {
Component focusOwner = getFocusOwner();
if (focusOwner != null) {
upFocusCycle(focusOwner);
}
}
/**
* Moves the focus down one focus traversal cycle from the current focus
* owner, if and only if the current focus owner is a Container that is a
* focus cycle root. Typically, the focus owner is set to the current focus
* owner's default Component to focus, and the current focus cycle root is
* set to the current focus owner. If the current focus owner is not a
* Container that is a focus cycle root, then no focus traversal operation
* occurs.
*/
public final void downFocusCycle() {
Component focusOwner = getFocusOwner();
if (focusOwner instanceof Container) {
downFocusCycle((Container)focusOwner);
}
}
/**
* Dumps the list of focus requests to stderr
*/
void dumpRequests() {
System.err.println(">>> Requests dump, time: " + System.currentTimeMillis());
synchronized (heavyweightRequests) {
for (HeavyweightFocusRequest req : heavyweightRequests) {
System.err.println(">>> Req: " + req);
}
}
System.err.println("");
}
private static final class LightweightFocusRequest {
final Component component;
final boolean temporary;
final CausedFocusEvent.Cause cause;
LightweightFocusRequest(Component component, boolean temporary, CausedFocusEvent.Cause cause) {
this.component = component;
this.temporary = temporary;
this.cause = cause;
}
public String toString() {
return "LightweightFocusRequest[component=" + component +
",temporary=" + temporary + ", cause=" + cause + "]";
}
}
private static final class HeavyweightFocusRequest {
final Component heavyweight;
final LinkedList<LightweightFocusRequest> lightweightRequests;
static final HeavyweightFocusRequest CLEAR_GLOBAL_FOCUS_OWNER =
new HeavyweightFocusRequest();
private HeavyweightFocusRequest() {
heavyweight = null;
lightweightRequests = null;
}
HeavyweightFocusRequest(Component heavyweight, Component descendant,
boolean temporary, CausedFocusEvent.Cause cause) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
if (heavyweight == null) {
log.fine("Assertion (heavyweight != null) failed");
}
}
this.heavyweight = heavyweight;
this.lightweightRequests = new LinkedList<LightweightFocusRequest>();
addLightweightRequest(descendant, temporary, cause);
}
boolean addLightweightRequest(Component descendant,
boolean temporary, CausedFocusEvent.Cause cause) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
if (this == HeavyweightFocusRequest.CLEAR_GLOBAL_FOCUS_OWNER) {
log.fine("Assertion (this != HeavyweightFocusRequest.CLEAR_GLOBAL_FOCUS_OWNER) failed");
}
if (descendant == null) {
log.fine("Assertion (descendant != null) failed");
}
}
Component lastDescendant = ((lightweightRequests.size() > 0)
? lightweightRequests.getLast().component
: null);
if (descendant != lastDescendant) {
// Not a duplicate request
lightweightRequests.add
(new LightweightFocusRequest(descendant, temporary, cause));
return true;
} else {
return false;
}
}
LightweightFocusRequest getFirstLightweightRequest() {
if (this == CLEAR_GLOBAL_FOCUS_OWNER) {
return null;
}
return lightweightRequests.getFirst();
}
public String toString() {
boolean first = true;
String str = "HeavyweightFocusRequest[heavweight=" + heavyweight +
",lightweightRequests=";
if (lightweightRequests == null) {
str += null;
} else {
str += "[";
for (LightweightFocusRequest lwRequest : lightweightRequests) {
if (first) {
first = false;
} else {
str += ",";
}
str += lwRequest;
}
str += "]";
}
str += "]";
return str;
}
}
/*
* heavyweightRequests is used as a monitor for synchronized changes of
* currentLightweightRequests, clearingCurrentLightweightRequests and
* newFocusOwner.
*/
private static LinkedList<HeavyweightFocusRequest> heavyweightRequests =
new LinkedList<HeavyweightFocusRequest>();
private static LinkedList<LightweightFocusRequest> currentLightweightRequests;
private static boolean clearingCurrentLightweightRequests;
private static boolean allowSyncFocusRequests = true;
private static Component newFocusOwner = null;
private static volatile boolean disableRestoreFocus;
static final int SNFH_FAILURE = 0;
static final int SNFH_SUCCESS_HANDLED = 1;
static final int SNFH_SUCCESS_PROCEED = 2;
static boolean processSynchronousLightweightTransfer(Component heavyweight, Component descendant,
boolean temporary, boolean focusedWindowChangeAllowed,
long time)
{
Window parentWindow = SunToolkit.getContainingWindow(heavyweight);
if (parentWindow == null || !parentWindow.syncLWRequests) {
return false;
}
if (descendant == null) {
// Focus transfers from a lightweight child back to the
// heavyweight Container should be treated like lightweight
// focus transfers.
descendant = heavyweight;
}
KeyboardFocusManager manager = getCurrentKeyboardFocusManager(SunToolkit.targetToAppContext(descendant));
FocusEvent currentFocusOwnerEvent = null;
FocusEvent newFocusOwnerEvent = null;
Component currentFocusOwner = manager.getGlobalFocusOwner();
synchronized (heavyweightRequests) {
HeavyweightFocusRequest hwFocusRequest = getLastHWRequest();
if (hwFocusRequest == null &&
heavyweight == manager.getNativeFocusOwner() &&
allowSyncFocusRequests)
{
if (descendant == currentFocusOwner) {
// Redundant request.
return true;
}
// 'heavyweight' owns the native focus and there are no pending
// requests. 'heavyweight' must be a Container and
// 'descendant' must not be the focus owner. Otherwise,
// we would never have gotten this far.
manager.enqueueKeyEvents(time, descendant);
hwFocusRequest =
new HeavyweightFocusRequest(heavyweight, descendant,
temporary, CausedFocusEvent.Cause.UNKNOWN);
heavyweightRequests.add(hwFocusRequest);
if (currentFocusOwner != null) {
currentFocusOwnerEvent =
new FocusEvent(currentFocusOwner,
FocusEvent.FOCUS_LOST,
temporary, descendant);
}
newFocusOwnerEvent =
new FocusEvent(descendant, FocusEvent.FOCUS_GAINED,
temporary, currentFocusOwner);
}
}
boolean result = false;
final boolean clearing = clearingCurrentLightweightRequests;
Throwable caughtEx = null;
try {
clearingCurrentLightweightRequests = false;
synchronized(Component.LOCK) {
if (currentFocusOwnerEvent != null && currentFocusOwner != null) {
((AWTEvent) currentFocusOwnerEvent).isPosted = true;
caughtEx = dispatchAndCatchException(caughtEx, currentFocusOwner, currentFocusOwnerEvent);
result = true;
}
if (newFocusOwnerEvent != null && descendant != null) {
((AWTEvent) newFocusOwnerEvent).isPosted = true;
caughtEx = dispatchAndCatchException(caughtEx, descendant, newFocusOwnerEvent);
result = true;
}
}
} finally {
clearingCurrentLightweightRequests = clearing;
}
if (caughtEx instanceof RuntimeException) {
throw (RuntimeException)caughtEx;
} else if (caughtEx instanceof Error) {
throw (Error)caughtEx;
}
return result;
}
/**
* Indicates whether the native implementation should proceed with a
* pending, native focus request. Before changing the focus at the native
* level, the AWT implementation should always call this function for
* permission. This function will reject the request if a duplicate request
* preceded it, or if the specified heavyweight Component already owns the
* focus and no native focus changes are pending. Otherwise, the request
* will be approved and the focus request list will be updated so that,
* if necessary, the proper descendant will be focused when the
* corresponding FOCUS_GAINED event on the heavyweight is received.
*
* An implementation must ensure that calls to this method and native
* focus changes are atomic. If this is not guaranteed, then the ordering
* of the focus request list may be incorrect, leading to errors in the
* type-ahead mechanism. Typically this is accomplished by only calling
* this function from the native event pumping thread, or by holding a
* global, native lock during invocation.
*/
static int shouldNativelyFocusHeavyweight
(Component heavyweight, Component descendant, boolean temporary,
boolean focusedWindowChangeAllowed, long time, CausedFocusEvent.Cause cause)
{
if (log.isLoggable(PlatformLogger.Level.FINE)) {
if (heavyweight == null) {
log.fine("Assertion (heavyweight != null) failed");
}
if (time == 0) {
log.fine("Assertion (time != 0) failed");
}
}
if (descendant == null) {
// Focus transfers from a lightweight child back to the
// heavyweight Container should be treated like lightweight
// focus transfers.
descendant = heavyweight;
}
KeyboardFocusManager manager =
getCurrentKeyboardFocusManager(SunToolkit.targetToAppContext(descendant));
KeyboardFocusManager thisManager = getCurrentKeyboardFocusManager();
Component currentFocusOwner = thisManager.getGlobalFocusOwner();
Component nativeFocusOwner = thisManager.getNativeFocusOwner();
Window nativeFocusedWindow = thisManager.getNativeFocusedWindow();
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("SNFH for {0} in {1}",
String.valueOf(descendant), String.valueOf(heavyweight));
}
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("0. Current focus owner {0}",
String.valueOf(currentFocusOwner));
focusLog.finest("0. Native focus owner {0}",
String.valueOf(nativeFocusOwner));
focusLog.finest("0. Native focused window {0}",
String.valueOf(nativeFocusedWindow));
}
synchronized (heavyweightRequests) {
HeavyweightFocusRequest hwFocusRequest = getLastHWRequest();
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Request {0}", String.valueOf(hwFocusRequest));
}
if (hwFocusRequest == null &&
heavyweight == nativeFocusOwner &&
heavyweight.getContainingWindow() == nativeFocusedWindow)
{
if (descendant == currentFocusOwner) {
// Redundant request.
if (focusLog.isLoggable(PlatformLogger.Level.FINEST))
focusLog.finest("1. SNFH_FAILURE for {0}",
String.valueOf(descendant));
return SNFH_FAILURE;
}
// 'heavyweight' owns the native focus and there are no pending
// requests. 'heavyweight' must be a Container and
// 'descendant' must not be the focus owner. Otherwise,
// we would never have gotten this far.
manager.enqueueKeyEvents(time, descendant);
hwFocusRequest =
new HeavyweightFocusRequest(heavyweight, descendant,
temporary, cause);
heavyweightRequests.add(hwFocusRequest);
if (currentFocusOwner != null) {
FocusEvent currentFocusOwnerEvent =
new CausedFocusEvent(currentFocusOwner,
FocusEvent.FOCUS_LOST,
temporary, descendant, cause);
// Fix 5028014. Rolled out.
// SunToolkit.postPriorityEvent(currentFocusOwnerEvent);
SunToolkit.postEvent(currentFocusOwner.appContext,
currentFocusOwnerEvent);
}
FocusEvent newFocusOwnerEvent =
new CausedFocusEvent(descendant, FocusEvent.FOCUS_GAINED,
temporary, currentFocusOwner, cause);
// Fix 5028014. Rolled out.
// SunToolkit.postPriorityEvent(newFocusOwnerEvent);
SunToolkit.postEvent(descendant.appContext, newFocusOwnerEvent);
if (focusLog.isLoggable(PlatformLogger.Level.FINEST))
focusLog.finest("2. SNFH_HANDLED for {0}", String.valueOf(descendant));
return SNFH_SUCCESS_HANDLED;
} else if (hwFocusRequest != null &&
hwFocusRequest.heavyweight == heavyweight) {
// 'heavyweight' doesn't have the native focus right now, but
// if all pending requests were completed, it would. Add
// descendant to the heavyweight's list of pending
// lightweight focus transfers.
if (hwFocusRequest.addLightweightRequest(descendant,
temporary, cause)) {
manager.enqueueKeyEvents(time, descendant);
}
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("3. SNFH_HANDLED for lightweight" +
descendant + " in " + heavyweight);
}
return SNFH_SUCCESS_HANDLED;
} else {
if (!focusedWindowChangeAllowed) {
// For purposes of computing oldFocusedWindow, we should look at
// the second to last HeavyweightFocusRequest on the queue iff the
// last HeavyweightFocusRequest is CLEAR_GLOBAL_FOCUS_OWNER. If
// there is no second to last HeavyweightFocusRequest, null is an
// acceptable value.
if (hwFocusRequest ==
HeavyweightFocusRequest.CLEAR_GLOBAL_FOCUS_OWNER)
{
int size = heavyweightRequests.size();
hwFocusRequest = (HeavyweightFocusRequest)((size >= 2)
? heavyweightRequests.get(size - 2)
: null);
}
if (focusedWindowChanged(heavyweight,
(hwFocusRequest != null)
? hwFocusRequest.heavyweight
: nativeFocusedWindow)) {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("4. SNFH_FAILURE for " + descendant);
}
return SNFH_FAILURE;
}
}
manager.enqueueKeyEvents(time, descendant);
heavyweightRequests.add
(new HeavyweightFocusRequest(heavyweight, descendant,
temporary, cause));
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("5. SNFH_PROCEED for " + descendant);
}
return SNFH_SUCCESS_PROCEED;
}
}
}
/**
* Returns the Window which will be active after processing this request,
* or null if this is a duplicate request. The active Window is useful
* because some native platforms do not support setting the native focus
* owner to null. On these platforms, the obvious choice is to set the
* focus owner to the focus proxy of the active Window.
*/
static Window markClearGlobalFocusOwner() {
// need to call this out of synchronized block to avoid possible deadlock
// see 6454631.
final Component nativeFocusedWindow =
getCurrentKeyboardFocusManager().getNativeFocusedWindow();
synchronized (heavyweightRequests) {
HeavyweightFocusRequest hwFocusRequest = getLastHWRequest();
if (hwFocusRequest ==
HeavyweightFocusRequest.CLEAR_GLOBAL_FOCUS_OWNER)
{
// duplicate request
return null;
}
heavyweightRequests.add
(HeavyweightFocusRequest.CLEAR_GLOBAL_FOCUS_OWNER);
Component activeWindow = ((hwFocusRequest != null)
? SunToolkit.getContainingWindow(hwFocusRequest.heavyweight)
: nativeFocusedWindow);
while (activeWindow != null &&
!((activeWindow instanceof Frame) ||
(activeWindow instanceof Dialog)))
{
activeWindow = activeWindow.getParent_NoClientCode();
}
return (Window) activeWindow;
}
}
Component getCurrentWaitingRequest(Component parent) {
synchronized (heavyweightRequests) {
HeavyweightFocusRequest hwFocusRequest = getFirstHWRequest();
if (hwFocusRequest != null) {
if (hwFocusRequest.heavyweight == parent) {
LightweightFocusRequest lwFocusRequest =
hwFocusRequest.lightweightRequests.getFirst();
if (lwFocusRequest != null) {
return lwFocusRequest.component;
}
}
}
}
return null;
}
static boolean isAutoFocusTransferEnabled() {
synchronized (heavyweightRequests) {
return (heavyweightRequests.size() == 0)
&& !disableRestoreFocus
&& (null == currentLightweightRequests);
}
}
static boolean isAutoFocusTransferEnabledFor(Component comp) {
return isAutoFocusTransferEnabled() && comp.isAutoFocusTransferOnDisposal();
}
/*
* Used to process exceptions in dispatching focus event (in focusLost/focusGained callbacks).
* @param ex previously caught exception that may be processed right here, or null
* @param comp the component to dispatch the event to
* @param event the event to dispatch to the component
*/
static private Throwable dispatchAndCatchException(Throwable ex, Component comp, FocusEvent event) {
Throwable retEx = null;
try {
comp.dispatchEvent(event);
} catch (RuntimeException re) {
retEx = re;
} catch (Error er) {
retEx = er;
}
if (retEx != null) {
if (ex != null) {
handleException(ex);
}
return retEx;
}
return ex;
}
static private void handleException(Throwable ex) {
ex.printStackTrace();
}
static void processCurrentLightweightRequests() {
KeyboardFocusManager manager = getCurrentKeyboardFocusManager();
LinkedList<LightweightFocusRequest> localLightweightRequests = null;
Component globalFocusOwner = manager.getGlobalFocusOwner();
if ((globalFocusOwner != null) &&
(globalFocusOwner.appContext != AppContext.getAppContext()))
{
// The current app context differs from the app context of a focus
// owner (and all pending lightweight requests), so we do nothing
// now and wait for a next event.
return;
}
synchronized(heavyweightRequests) {
if (currentLightweightRequests != null) {
clearingCurrentLightweightRequests = true;
disableRestoreFocus = true;
localLightweightRequests = currentLightweightRequests;
allowSyncFocusRequests = (localLightweightRequests.size() < 2);
currentLightweightRequests = null;
} else {
// do nothing
return;
}
}
Throwable caughtEx = null;
try {
if (localLightweightRequests != null) {
Component lastFocusOwner = null;
Component currentFocusOwner = null;
for (Iterator<KeyboardFocusManager.LightweightFocusRequest> iter = localLightweightRequests.iterator(); iter.hasNext(); ) {
currentFocusOwner = manager.getGlobalFocusOwner();
LightweightFocusRequest lwFocusRequest =
iter.next();
/*
* WARNING: This is based on DKFM's logic solely!
*
* We allow to trigger restoreFocus() in the dispatching process
* only if we have the last request to dispatch. If the last request
* fails, focus will be restored to either the component of the last
* previously succedded request, or to to the focus owner that was
* before this clearing process.
*/
if (!iter.hasNext()) {
disableRestoreFocus = false;
}
FocusEvent currentFocusOwnerEvent = null;
/*
* We're not dispatching FOCUS_LOST while the current focus owner is null.
* But regardless of whether it's null or not, we're clearing ALL the local
* lw requests.
*/
if (currentFocusOwner != null) {
currentFocusOwnerEvent = new CausedFocusEvent(currentFocusOwner,
FocusEvent.FOCUS_LOST,
lwFocusRequest.temporary,
lwFocusRequest.component, lwFocusRequest.cause);
}
FocusEvent newFocusOwnerEvent =
new CausedFocusEvent(lwFocusRequest.component,
FocusEvent.FOCUS_GAINED,
lwFocusRequest.temporary,
currentFocusOwner == null ? lastFocusOwner : currentFocusOwner,
lwFocusRequest.cause);
if (currentFocusOwner != null) {
((AWTEvent) currentFocusOwnerEvent).isPosted = true;
caughtEx = dispatchAndCatchException(caughtEx, currentFocusOwner, currentFocusOwnerEvent);
}
((AWTEvent) newFocusOwnerEvent).isPosted = true;
caughtEx = dispatchAndCatchException(caughtEx, lwFocusRequest.component, newFocusOwnerEvent);
if (manager.getGlobalFocusOwner() == lwFocusRequest.component) {
lastFocusOwner = lwFocusRequest.component;
}
}
}
} finally {
clearingCurrentLightweightRequests = false;
disableRestoreFocus = false;
localLightweightRequests = null;
allowSyncFocusRequests = true;
}
if (caughtEx instanceof RuntimeException) {
throw (RuntimeException)caughtEx;
} else if (caughtEx instanceof Error) {
throw (Error)caughtEx;
}
}
static FocusEvent retargetUnexpectedFocusEvent(FocusEvent fe) {
synchronized (heavyweightRequests) {
// Any other case represents a failure condition which we did
// not expect. We need to clearFocusRequestList() and patch up
// the event as best as possible.
if (removeFirstRequest()) {
return (FocusEvent)retargetFocusEvent(fe);
}
Component source = fe.getComponent();
Component opposite = fe.getOppositeComponent();
boolean temporary = false;
if (fe.getID() == FocusEvent.FOCUS_LOST &&
(opposite == null || isTemporary(opposite, source)))
{
temporary = true;
}
return new CausedFocusEvent(source, fe.getID(), temporary, opposite,
CausedFocusEvent.Cause.NATIVE_SYSTEM);
}
}
static FocusEvent retargetFocusGained(FocusEvent fe) {
assert (fe.getID() == FocusEvent.FOCUS_GAINED);
Component currentFocusOwner = getCurrentKeyboardFocusManager().
getGlobalFocusOwner();
Component source = fe.getComponent();
Component opposite = fe.getOppositeComponent();
Component nativeSource = getHeavyweight(source);
synchronized (heavyweightRequests) {
HeavyweightFocusRequest hwFocusRequest = getFirstHWRequest();
if (hwFocusRequest == HeavyweightFocusRequest.CLEAR_GLOBAL_FOCUS_OWNER)
{
return retargetUnexpectedFocusEvent(fe);
}
if (source != null && nativeSource == null && hwFocusRequest != null) {
// if source w/o peer and
// if source is equal to first lightweight
// then we should correct source and nativeSource
if (source == hwFocusRequest.getFirstLightweightRequest().component)
{
source = hwFocusRequest.heavyweight;
nativeSource = source; // source is heavuweight itself
}
}
if (hwFocusRequest != null &&
nativeSource == hwFocusRequest.heavyweight)
{
// Focus change as a result of a known call to requestFocus(),
// or known click on a peer focusable heavyweight Component.
heavyweightRequests.removeFirst();
LightweightFocusRequest lwFocusRequest =
hwFocusRequest.lightweightRequests.removeFirst();
Component newSource = lwFocusRequest.component;
if (currentFocusOwner != null) {
/*
* Since we receive FOCUS_GAINED when current focus
* owner is not null, correcponding FOCUS_LOST is supposed
* to be lost. And so, we keep new focus owner
* to determine synthetic FOCUS_LOST event which will be
* generated by KeyboardFocusManager for this FOCUS_GAINED.
*
* This code based on knowledge of
* DefaultKeyboardFocusManager's implementation and might
* be not applicable for another KeyboardFocusManager.
*/
newFocusOwner = newSource;
}
boolean temporary = (opposite == null ||
isTemporary(newSource, opposite))
? false
: lwFocusRequest.temporary;
if (hwFocusRequest.lightweightRequests.size() > 0) {
currentLightweightRequests =
hwFocusRequest.lightweightRequests;
EventQueue.invokeLater(new Runnable() {
public void run() {
processCurrentLightweightRequests();
}
});
}
// 'opposite' will be fixed by
// DefaultKeyboardFocusManager.realOppositeComponent
return new CausedFocusEvent(newSource,
FocusEvent.FOCUS_GAINED, temporary,
opposite, lwFocusRequest.cause);
}
if (currentFocusOwner != null
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java