JDK8/Java8源码在线阅读
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package java.awt;
import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;
import java.awt.event.WindowEvent;
import java.awt.peer.ComponentPeer;
import java.awt.peer.LightweightPeer;
import java.lang.ref.WeakReference;
import java.util.LinkedList;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.Set;
import sun.util.logging.PlatformLogger;
import sun.awt.AppContext;
import sun.awt.SunToolkit;
import sun.awt.AWTAccessor;
import sun.awt.CausedFocusEvent;
import sun.awt.TimedWindowEvent;
/**
* The default KeyboardFocusManager for AWT applications. Focus traversal is
* done in response to a Component's focus traversal keys, and using a
* Container's FocusTraversalPolicy.
* <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 FocusTraversalPolicy
* @see Component#setFocusTraversalKeys
* @see Component#getFocusTraversalKeys
* @since 1.4
*/
public class DefaultKeyboardFocusManager extends KeyboardFocusManager {
private static final PlatformLogger focusLog = PlatformLogger.getLogger("java.awt.focus.DefaultKeyboardFocusManager");
// null weak references to not create too many objects
private static final WeakReference<Window> NULL_WINDOW_WR =
new WeakReference<Window>(null);
private static final WeakReference<Component> NULL_COMPONENT_WR =
new WeakReference<Component>(null);
private WeakReference<Window> realOppositeWindowWR = NULL_WINDOW_WR;
private WeakReference<Component> realOppositeComponentWR = NULL_COMPONENT_WR;
private int inSendMessage;
private LinkedList<KeyEvent> enqueuedKeyEvents = new LinkedList<KeyEvent>();
private LinkedList<TypeAheadMarker> typeAheadMarkers = new LinkedList<TypeAheadMarker>();
private boolean consumeNextKeyTyped;
static {
AWTAccessor.setDefaultKeyboardFocusManagerAccessor(
new AWTAccessor.DefaultKeyboardFocusManagerAccessor() {
public void consumeNextKeyTyped(DefaultKeyboardFocusManager dkfm, KeyEvent e) {
dkfm.consumeNextKeyTyped(e);
}
});
}
private static class TypeAheadMarker {
long after;
Component untilFocused;
TypeAheadMarker(long after, Component untilFocused) {
this.after = after;
this.untilFocused = untilFocused;
}
/**
* Returns string representation of the marker
*/
public String toString() {
return ">>> Marker after " + after + " on " + untilFocused;
}
}
private Window getOwningFrameDialog(Window window) {
while (window != null && !(window instanceof Frame ||
window instanceof Dialog)) {
window = (Window)window.getParent();
}
return window;
}
/*
* This series of restoreFocus methods is used for recovering from a
* rejected focus or activation change. Rejections typically occur when
* the user attempts to focus a non-focusable Component or Window.
*/
private void restoreFocus(FocusEvent fe, Window newFocusedWindow) {
Component realOppositeComponent = this.realOppositeComponentWR.get();
Component vetoedComponent = fe.getComponent();
if (newFocusedWindow != null && restoreFocus(newFocusedWindow,
vetoedComponent, false))
{
} else if (realOppositeComponent != null &&
doRestoreFocus(realOppositeComponent, vetoedComponent, false)) {
} else if (fe.getOppositeComponent() != null &&
doRestoreFocus(fe.getOppositeComponent(), vetoedComponent, false)) {
} else {
clearGlobalFocusOwnerPriv();
}
}
private void restoreFocus(WindowEvent we) {
Window realOppositeWindow = this.realOppositeWindowWR.get();
if (realOppositeWindow != null
&& restoreFocus(realOppositeWindow, null, false))
{
// do nothing, everything is done in restoreFocus()
} else if (we.getOppositeWindow() != null &&
restoreFocus(we.getOppositeWindow(), null, false))
{
// do nothing, everything is done in restoreFocus()
} else {
clearGlobalFocusOwnerPriv();
}
}
private boolean restoreFocus(Window aWindow, Component vetoedComponent,
boolean clearOnFailure) {
Component toFocus =
KeyboardFocusManager.getMostRecentFocusOwner(aWindow);
if (toFocus != null && toFocus != vetoedComponent && doRestoreFocus(toFocus, vetoedComponent, false)) {
return true;
} else if (clearOnFailure) {
clearGlobalFocusOwnerPriv();
return true;
} else {
return false;
}
}
private boolean restoreFocus(Component toFocus, boolean clearOnFailure) {
return doRestoreFocus(toFocus, null, clearOnFailure);
}
private boolean doRestoreFocus(Component toFocus, Component vetoedComponent,
boolean clearOnFailure)
{
if (toFocus != vetoedComponent && toFocus.isShowing() && toFocus.canBeFocusOwner() &&
toFocus.requestFocus(false, CausedFocusEvent.Cause.ROLLBACK))
{
return true;
} else {
Component nextFocus = toFocus.getNextFocusCandidate();
if (nextFocus != null && nextFocus != vetoedComponent &&
nextFocus.requestFocusInWindow(CausedFocusEvent.Cause.ROLLBACK))
{
return true;
} else if (clearOnFailure) {
clearGlobalFocusOwnerPriv();
return true;
} else {
return false;
}
}
}
/**
* A special type of SentEvent which updates a counter in the target
* KeyboardFocusManager if it is an instance of
* DefaultKeyboardFocusManager.
*/
private static class DefaultKeyboardFocusManagerSentEvent
extends SentEvent
{
/*
* serialVersionUID
*/
private static final long serialVersionUID = -2924743257508701758L;
public DefaultKeyboardFocusManagerSentEvent(AWTEvent nested,
AppContext toNotify) {
super(nested, toNotify);
}
public final void dispatch() {
KeyboardFocusManager manager =
KeyboardFocusManager.getCurrentKeyboardFocusManager();
DefaultKeyboardFocusManager defaultManager =
(manager instanceof DefaultKeyboardFocusManager)
? (DefaultKeyboardFocusManager)manager
: null;
if (defaultManager != null) {
synchronized (defaultManager) {
defaultManager.inSendMessage++;
}
}
super.dispatch();
if (defaultManager != null) {
synchronized (defaultManager) {
defaultManager.inSendMessage--;
}
}
}
}
/**
* Sends a synthetic AWTEvent to a Component. If the Component is in
* the current AppContext, then the event is immediately dispatched.
* If the Component is in a different AppContext, then the event is
* posted to the other AppContext's EventQueue, and this method blocks
* until the event is handled or target AppContext is disposed.
* Returns true if successfuly dispatched event, false if failed
* to dispatch.
*/
static boolean sendMessage(Component target, AWTEvent e) {
e.isPosted = true;
AppContext myAppContext = AppContext.getAppContext();
final AppContext targetAppContext = target.appContext;
final SentEvent se =
new DefaultKeyboardFocusManagerSentEvent(e, myAppContext);
if (myAppContext == targetAppContext) {
se.dispatch();
} else {
if (targetAppContext.isDisposed()) {
return false;
}
SunToolkit.postEvent(targetAppContext, se);
if (EventQueue.isDispatchThread()) {
EventDispatchThread edt = (EventDispatchThread)
Thread.currentThread();
edt.pumpEvents(SentEvent.ID, new Conditional() {
public boolean evaluate() {
return !se.dispatched && !targetAppContext.isDisposed();
}
});
} else {
synchronized (se) {
while (!se.dispatched && !targetAppContext.isDisposed()) {
try {
se.wait(1000);
} catch (InterruptedException ie) {
break;
}
}
}
}
}
return se.dispatched;
}
/*
* Checks if the focus window event follows key events waiting in the type-ahead
* queue (if any). This may happen when a user types ahead in the window, the client
* listeners hang EDT for a while, and the user switches b/w toplevels. In that
* case the focus window events may be dispatched before the type-ahead events
* get handled. This may lead to wrong focus behavior and in order to avoid it,
* the focus window events are reposted to the end of the event queue. See 6981400.
*/
private boolean repostIfFollowsKeyEvents(WindowEvent e) {
if (!(e instanceof TimedWindowEvent)) {
return false;
}
TimedWindowEvent we = (TimedWindowEvent)e;
long time = we.getWhen();
synchronized (this) {
KeyEvent ke = enqueuedKeyEvents.isEmpty() ? null : enqueuedKeyEvents.getFirst();
if (ke != null && time >= ke.getWhen()) {
TypeAheadMarker marker = typeAheadMarkers.isEmpty() ? null : typeAheadMarkers.getFirst();
if (marker != null) {
Window toplevel = marker.untilFocused.getContainingWindow();
// Check that the component awaiting focus belongs to
// the current focused window. See 8015454.
if (toplevel != null && toplevel.isFocused()) {
SunToolkit.postEvent(AppContext.getAppContext(), new SequencedEvent(e));
return true;
}
}
}
}
return false;
}
/**
* This method is called by the AWT event dispatcher requesting that the
* current KeyboardFocusManager dispatch the specified event on its behalf.
* DefaultKeyboardFocusManagers dispatch all FocusEvents, all WindowEvents
* related to focus, and all KeyEvents. These events are 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. 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
*/
public boolean dispatchEvent(AWTEvent e) {
if (focusLog.isLoggable(PlatformLogger.Level.FINE) && (e instanceof WindowEvent || e instanceof FocusEvent)) {
focusLog.fine("" + e);
}
switch (e.getID()) {
case WindowEvent.WINDOW_GAINED_FOCUS: {
if (repostIfFollowsKeyEvents((WindowEvent)e)) {
break;
}
WindowEvent we = (WindowEvent)e;
Window oldFocusedWindow = getGlobalFocusedWindow();
Window newFocusedWindow = we.getWindow();
if (newFocusedWindow == oldFocusedWindow) {
break;
}
if (!(newFocusedWindow.isFocusableWindow()
&& newFocusedWindow.isVisible()
&& newFocusedWindow.isDisplayable()))
{
// we can not accept focus on such window, so reject it.
restoreFocus(we);
break;
}
// If there exists a current focused window, then notify it
// that it has lost focus.
if (oldFocusedWindow != null) {
boolean isEventDispatched =
sendMessage(oldFocusedWindow,
new WindowEvent(oldFocusedWindow,
WindowEvent.WINDOW_LOST_FOCUS,
newFocusedWindow));
// Failed to dispatch, clear by ourselfves
if (!isEventDispatched) {
setGlobalFocusOwner(null);
setGlobalFocusedWindow(null);
}
}
// Because the native libraries do not post WINDOW_ACTIVATED
// events, we need to synthesize one if the active Window
// changed.
Window newActiveWindow =
getOwningFrameDialog(newFocusedWindow);
Window currentActiveWindow = getGlobalActiveWindow();
if (newActiveWindow != currentActiveWindow) {
sendMessage(newActiveWindow,
new WindowEvent(newActiveWindow,
WindowEvent.WINDOW_ACTIVATED,
currentActiveWindow));
if (newActiveWindow != getGlobalActiveWindow()) {
// Activation change was rejected. Unlikely, but
// possible.
restoreFocus(we);
break;
}
}
setGlobalFocusedWindow(newFocusedWindow);
if (newFocusedWindow != getGlobalFocusedWindow()) {
// Focus change was rejected. Will happen if
// newFocusedWindow is not a focusable Window.
restoreFocus(we);
break;
}
// Restore focus to the Component which last held it. We do
// this here so that client code can override our choice in
// a WINDOW_GAINED_FOCUS handler.
//
// Make sure that the focus change request doesn't change the
// focused Window in case we are no longer the focused Window
// when the request is handled.
if (inSendMessage == 0) {
// Identify which Component should initially gain focus
// in the Window.
//
// * If we're in SendMessage, then this is a synthetic
// WINDOW_GAINED_FOCUS message which was generated by a
// the FOCUS_GAINED handler. Allow the Component to
// which the FOCUS_GAINED message was targeted to
// receive the focus.
// * Otherwise, look up the correct Component here.
// We don't use Window.getMostRecentFocusOwner because
// window is focused now and 'null' will be returned
// Calculating of most recent focus owner and focus
// request should be synchronized on KeyboardFocusManager.class
// to prevent from thread race when user will request
// focus between calculation and our request.
// But if focus transfer is synchronous, this synchronization
// may cause deadlock, thus we don't synchronize this block.
Component toFocus = KeyboardFocusManager.
getMostRecentFocusOwner(newFocusedWindow);
if ((toFocus == null) &&
newFocusedWindow.isFocusableWindow())
{
toFocus = newFocusedWindow.getFocusTraversalPolicy().
getInitialComponent(newFocusedWindow);
}
Component tempLost = null;
synchronized(KeyboardFocusManager.class) {
tempLost = newFocusedWindow.setTemporaryLostComponent(null);
}
// The component which last has the focus when this window was focused
// should receive focus first
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("tempLost {0}, toFocus {1}",
tempLost, toFocus);
}
if (tempLost != null) {
tempLost.requestFocusInWindow(CausedFocusEvent.Cause.ACTIVATION);
}
if (toFocus != null && toFocus != tempLost) {
// If there is a component which requested focus when this window
// was inactive it expects to receive focus after activation.
toFocus.requestFocusInWindow(CausedFocusEvent.Cause.ACTIVATION);
}
}
Window realOppositeWindow = this.realOppositeWindowWR.get();
if (realOppositeWindow != we.getOppositeWindow()) {
we = new WindowEvent(newFocusedWindow,
WindowEvent.WINDOW_GAINED_FOCUS,
realOppositeWindow);
}
return typeAheadAssertions(newFocusedWindow, we);
}
case WindowEvent.WINDOW_ACTIVATED: {
WindowEvent we = (WindowEvent)e;
Window oldActiveWindow = getGlobalActiveWindow();
Window newActiveWindow = we.getWindow();
if (oldActiveWindow == newActiveWindow) {
break;
}
// If there exists a current active window, then notify it that
// it has lost activation.
if (oldActiveWindow != null) {
boolean isEventDispatched =
sendMessage(oldActiveWindow,
new WindowEvent(oldActiveWindow,
WindowEvent.WINDOW_DEACTIVATED,
newActiveWindow));
// Failed to dispatch, clear by ourselfves
if (!isEventDispatched) {
setGlobalActiveWindow(null);
}
if (getGlobalActiveWindow() != null) {
// Activation change was rejected. Unlikely, but
// possible.
break;
}
}
setGlobalActiveWindow(newActiveWindow);
if (newActiveWindow != getGlobalActiveWindow()) {
// Activation change was rejected. Unlikely, but
// possible.
break;
}
return typeAheadAssertions(newActiveWindow, we);
}
case FocusEvent.FOCUS_GAINED: {
FocusEvent fe = (FocusEvent)e;
CausedFocusEvent.Cause cause = (fe instanceof CausedFocusEvent) ?
((CausedFocusEvent)fe).getCause() : CausedFocusEvent.Cause.UNKNOWN;
Component oldFocusOwner = getGlobalFocusOwner();
Component newFocusOwner = fe.getComponent();
if (oldFocusOwner == newFocusOwner) {
if (focusLog.isLoggable(PlatformLogger.Level.FINE)) {
focusLog.fine("Skipping {0} because focus owner is the same", e);
}
// We can't just drop the event - there could be
// type-ahead markers associated with it.
dequeueKeyEvents(-1, newFocusOwner);
break;
}
// If there exists a current focus owner, then notify it that
// it has lost focus.
if (oldFocusOwner != null) {
boolean isEventDispatched =
sendMessage(oldFocusOwner,
new CausedFocusEvent(oldFocusOwner,
FocusEvent.FOCUS_LOST,
fe.isTemporary(),
newFocusOwner, cause));
// Failed to dispatch, clear by ourselfves
if (!isEventDispatched) {
setGlobalFocusOwner(null);
if (!fe.isTemporary()) {
setGlobalPermanentFocusOwner(null);
}
}
}
// Because the native windowing system has a different notion
// of the current focus and activation states, it is possible
// that a Component outside of the focused Window receives a
// FOCUS_GAINED event. We synthesize a WINDOW_GAINED_FOCUS
// event in that case.
final Window newFocusedWindow = SunToolkit.getContainingWindow(newFocusOwner);
final Window currentFocusedWindow = getGlobalFocusedWindow();
if (newFocusedWindow != null &&
newFocusedWindow != currentFocusedWindow)
{
sendMessage(newFocusedWindow,
new WindowEvent(newFocusedWindow,
WindowEvent.WINDOW_GAINED_FOCUS,
currentFocusedWindow));
if (newFocusedWindow != getGlobalFocusedWindow()) {
// Focus change was rejected. Will happen if
// newFocusedWindow is not a focusable Window.
// Need to recover type-ahead, but don't bother
// restoring focus. That was done by the
// WINDOW_GAINED_FOCUS handler
dequeueKeyEvents(-1, newFocusOwner);
break;
}
}
if (!(newFocusOwner.isFocusable() && newFocusOwner.isShowing() &&
// Refuse focus on a disabled component if the focus event
// isn't of UNKNOWN reason (i.e. not a result of a direct request
// but traversal, activation or system generated).
(newFocusOwner.isEnabled() || cause.equals(CausedFocusEvent.Cause.UNKNOWN))))
{
// we should not accept focus on such component, so reject it.
dequeueKeyEvents(-1, newFocusOwner);
if (KeyboardFocusManager.isAutoFocusTransferEnabled()) {
// If FOCUS_GAINED is for a disposed component (however
// it shouldn't happen) its toplevel parent is null. In this
// case we have to try to restore focus in the current focused
// window (for the details: 6607170).
if (newFocusedWindow == null) {
restoreFocus(fe, currentFocusedWindow);
} else {
restoreFocus(fe, newFocusedWindow);
}
setMostRecentFocusOwner(newFocusedWindow, null); // see: 8013773
}
break;
}
setGlobalFocusOwner(newFocusOwner);
if (newFocusOwner != getGlobalFocusOwner()) {
// Focus change was rejected. Will happen if
// newFocusOwner is not focus traversable.
dequeueKeyEvents(-1, newFocusOwner);
if (KeyboardFocusManager.isAutoFocusTransferEnabled()) {
restoreFocus(fe, (Window)newFocusedWindow);
}
break;
}
if (!fe.isTemporary()) {
setGlobalPermanentFocusOwner(newFocusOwner);
if (newFocusOwner != getGlobalPermanentFocusOwner()) {
// Focus change was rejected. Unlikely, but possible.
dequeueKeyEvents(-1, newFocusOwner);
if (KeyboardFocusManager.isAutoFocusTransferEnabled()) {
restoreFocus(fe, (Window)newFocusedWindow);
}
break;
}
}
setNativeFocusOwner(getHeavyweight(newFocusOwner));
Component realOppositeComponent = this.realOppositeComponentWR.get();
if (realOppositeComponent != null &&
realOppositeComponent != fe.getOppositeComponent()) {
fe = new CausedFocusEvent(newFocusOwner,
FocusEvent.FOCUS_GAINED,
fe.isTemporary(),
realOppositeComponent, cause);
((AWTEvent) fe).isPosted = true;
}
return typeAheadAssertions(newFocusOwner, fe);
}
case FocusEvent.FOCUS_LOST: {
FocusEvent fe = (FocusEvent)e;
Component currentFocusOwner = getGlobalFocusOwner();
if (currentFocusOwner == null) {
if (focusLog.isLoggable(PlatformLogger.Level.FINE))
focusLog.fine("Skipping {0} because focus owner is null", e);
break;
}
// Ignore cases where a Component loses focus to itself.
// If we make a mistake because of retargeting, then the
// FOCUS_GAINED handler will correct it.
if (currentFocusOwner == fe.getOppositeComponent()) {
if (focusLog.isLoggable(PlatformLogger.Level.FINE))
focusLog.fine("Skipping {0} because current focus owner is equal to opposite", e);
break;
}
setGlobalFocusOwner(null);
if (getGlobalFocusOwner() != null) {
// Focus change was rejected. Unlikely, but possible.
restoreFocus(currentFocusOwner, true);
break;
}
if (!fe.isTemporary()) {
setGlobalPermanentFocusOwner(null);
if (getGlobalPermanentFocusOwner() != null) {
// Focus change was rejected. Unlikely, but possible.
restoreFocus(currentFocusOwner, true);
break;
}
} else {
Window owningWindow = currentFocusOwner.getContainingWindow();
if (owningWindow != null) {
owningWindow.setTemporaryLostComponent(currentFocusOwner);
}
}
setNativeFocusOwner(null);
fe.setSource(currentFocusOwner);
realOppositeComponentWR = (fe.getOppositeComponent() != null)
? new WeakReference<Component>(currentFocusOwner)
: NULL_COMPONENT_WR;
return typeAheadAssertions(currentFocusOwner, fe);
}
case WindowEvent.WINDOW_DEACTIVATED: {
WindowEvent we = (WindowEvent)e;
Window currentActiveWindow = getGlobalActiveWindow();
if (currentActiveWindow == null) {
break;
}
if (currentActiveWindow != e.getSource()) {
// The event is lost in time.
// Allow listeners to precess the event but do not
// change any global states
break;
}
setGlobalActiveWindow(null);
if (getGlobalActiveWindow() != null) {
// Activation change was rejected. Unlikely, but possible.
break;
}
we.setSource(currentActiveWindow);
return typeAheadAssertions(currentActiveWindow, we);
}
case WindowEvent.WINDOW_LOST_FOCUS: {
if (repostIfFollowsKeyEvents((WindowEvent)e)) {
break;
}
WindowEvent we = (WindowEvent)e;
Window currentFocusedWindow = getGlobalFocusedWindow();
Window losingFocusWindow = we.getWindow();
Window activeWindow = getGlobalActiveWindow();
Window oppositeWindow = we.getOppositeWindow();
if (focusLog.isLoggable(PlatformLogger.Level.FINE))
focusLog.fine("Active {0}, Current focused {1}, losing focus {2} opposite {3}",
activeWindow, currentFocusedWindow,
losingFocusWindow, oppositeWindow);
if (currentFocusedWindow == null) {
break;
}
// Special case -- if the native windowing system posts an
// event claiming that the active Window has lost focus to the
// focused Window, then discard the event. This is an artifact
// of the native windowing system not knowing which Window is
// really focused.
if (inSendMessage == 0 && losingFocusWindow == activeWindow &&
oppositeWindow == currentFocusedWindow)
{
break;
}
Component currentFocusOwner = getGlobalFocusOwner();
if (currentFocusOwner != null) {
// The focus owner should always receive a FOCUS_LOST event
// before the Window is defocused.
Component oppositeComp = null;
if (oppositeWindow != null) {
oppositeComp = oppositeWindow.getTemporaryLostComponent();
if (oppositeComp == null) {
oppositeComp = oppositeWindow.getMostRecentFocusOwner();
}
}
if (oppositeComp == null) {
oppositeComp = oppositeWindow;
}
sendMessage(currentFocusOwner,
new CausedFocusEvent(currentFocusOwner,
FocusEvent.FOCUS_LOST,
true,
oppositeComp, CausedFocusEvent.Cause.ACTIVATION));
}
setGlobalFocusedWindow(null);
if (getGlobalFocusedWindow() != null) {
// Focus change was rejected. Unlikely, but possible.
restoreFocus(currentFocusedWindow, null, true);
break;
}
we.setSource(currentFocusedWindow);
realOppositeWindowWR = (oppositeWindow != null)
? new WeakReference<Window>(currentFocusedWindow)
: NULL_WINDOW_WR;
typeAheadAssertions(currentFocusedWindow, we);
if (oppositeWindow == null) {
// Then we need to deactive the active Window as well.
// No need to synthesize in other cases, because
// WINDOW_ACTIVATED will handle it if necessary.
sendMessage(activeWindow,
new WindowEvent(activeWindow,
WindowEvent.WINDOW_DEACTIVATED,
null));
if (getGlobalActiveWindow() != null) {
// Activation change was rejected. Unlikely,
// but possible.
restoreFocus(currentFocusedWindow, null, true);
}
}
break;
}
case KeyEvent.KEY_TYPED:
case KeyEvent.KEY_PRESSED:
case KeyEvent.KEY_RELEASED:
return typeAheadAssertions(null, e);
default:
return false;
}
return true;
}
/**
* Called by <code>dispatchEvent</code> if no other
* KeyEventDispatcher in the dispatcher chain dispatched the KeyEvent, or
* if no other KeyEventDispatchers are registered. If the event has not
* been consumed, its target is enabled, and the focus owner is not null,
* this method dispatches the event to its target. This method will also
* subsequently dispatch the event to all registered
* KeyEventPostProcessors. After all this operations are finished,
* the event is passed to peers for processing.
* <p>
* In all cases, this method returns <code>true</code>, since
* DefaultKeyboardFocusManager is designed so that neither
* <code>dispatchEvent</code>, nor the AWT event dispatcher, should take
* further action on the event in any situation.
*
* @param e the KeyEvent to be dispatched
* @return <code>true</code>
* @see Component#dispatchEvent
*/
public boolean dispatchKeyEvent(KeyEvent e) {
Component focusOwner = (((AWTEvent)e).isPosted) ? getFocusOwner() : e.getComponent();
if (focusOwner != null && focusOwner.isShowing() && focusOwner.canBeFocusOwner()) {
if (!e.isConsumed()) {
Component comp = e.getComponent();
if (comp != null && comp.isEnabled()) {
redispatchEvent(comp, e);
}
}
}
boolean stopPostProcessing = false;
java.util.List<KeyEventPostProcessor> processors = getKeyEventPostProcessors();
if (processors != null) {
for (java.util.Iterator<KeyEventPostProcessor> iter = processors.iterator();
!stopPostProcessing && iter.hasNext(); )
{
stopPostProcessing = iter.next().
postProcessKeyEvent(e);
}
}
if (!stopPostProcessing) {
postProcessKeyEvent(e);
}
// Allow the peer to process KeyEvent
Component source = e.getComponent();
ComponentPeer peer = source.getPeer();
if (peer == null || peer instanceof LightweightPeer) {
// if focus owner is lightweight then its native container
// processes event
Container target = source.getNativeContainer();
if (target != null) {
peer = target.getPeer();
}
}
if (peer != null) {
peer.handleEvent(e);
}
return true;
}
/**
* This method will be called by <code>dispatchKeyEvent</code>. It 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>
* @see #dispatchKeyEvent
* @see MenuShortcut
*/
public boolean postProcessKeyEvent(KeyEvent e) {
if (!e.isConsumed()) {
Component target = e.getComponent();
Container p = (Container)
(target instanceof Container ? target : target.getParent());
if (p != null) {
p.postProcessKeyEvent(e);
}
}
return true;
}
private void pumpApprovedKeyEvents() {
KeyEvent ke;
do {
ke = null;
synchronized (this) {
if (enqueuedKeyEvents.size() != 0) {
ke = enqueuedKeyEvents.getFirst();
if (typeAheadMarkers.size() != 0) {
TypeAheadMarker marker = typeAheadMarkers.getFirst();
// Fixed 5064013: may appears that the events have the same time
// if (ke.getWhen() >= marker.after) {
// The fix is rolled out.
if (ke.getWhen() > marker.after) {
ke = null;
}
}
if (ke != null) {
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("Pumping approved event {0}", ke);
}
enqueuedKeyEvents.removeFirst();
}
}
}
if (ke != null) {
preDispatchKeyEvent(ke);
}
} while (ke != null);
}
/**
* Dumps the list of type-ahead queue markers to stderr
*/
void dumpMarkers() {
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest(">>> Markers dump, time: {0}", System.currentTimeMillis());
synchronized (this) {
if (typeAheadMarkers.size() != 0) {
Iterator<TypeAheadMarker> iter = typeAheadMarkers.iterator();
while (iter.hasNext()) {
TypeAheadMarker marker = iter.next();
focusLog.finest(" {0}", marker);
}
}
}
}
}
private boolean typeAheadAssertions(Component target, AWTEvent e) {
// Clear any pending events here as well as in the FOCUS_GAINED
// handler. We need this call here in case a marker was removed in
// response to a call to dequeueKeyEvents.
pumpApprovedKeyEvents();
switch (e.getID()) {
case KeyEvent.KEY_TYPED:
case KeyEvent.KEY_PRESSED:
case KeyEvent.KEY_RELEASED: {
KeyEvent ke = (KeyEvent)e;
synchronized (this) {
if (e.isPosted && typeAheadMarkers.size() != 0) {
TypeAheadMarker marker = typeAheadMarkers.getFirst();
// Fixed 5064013: may appears that the events have the same time
// if (ke.getWhen() >= marker.after) {
// The fix is rolled out.
if (ke.getWhen() > marker.after) {
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("Storing event {0} because of marker {1}", ke, marker);
}
enqueuedKeyEvents.addLast(ke);
return true;
}
}
}
// KeyEvent was posted before focus change request
return preDispatchKeyEvent(ke);
}
case FocusEvent.FOCUS_GAINED:
if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
focusLog.finest("Markers before FOCUS_GAINED on {0}", target);
}
dumpMarkers();
// Search the marker list for the first marker tied to
// the Component which just gained focus. Then remove
// that marker, any markers which immediately follow
// and are tied to the same component, and all markers
// that preceed it. This handles the case where
// multiple focus requests were made for the same
// Component in a row and when we lost some of the
// earlier requests. Since FOCUS_GAINED events will
// not be generated for these additional requests, we
// need to clear those markers too.
synchronized (this) {
boolean found = false;
if (hasMarker(target)) {
for (Iterator<TypeAheadMarker> iter = typeAheadMarkers.iterator();
iter.hasNext(); )
{
if (iter.next().untilFocused == target) {
found = true;
} else if (found) {
break;
}
iter.remove();
}
} else {
// Exception condition - event without marker
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("Event without marker {0}", e);
}
}
}
focusLog.finest("Markers after FOCUS_GAINED");
dumpMarkers();
redispatchEvent(target, e);
// Now, dispatch any pending KeyEvents which have been
// released because of the FOCUS_GAINED event so that we don't
// have to wait for another event to be posted to the queue.
pumpApprovedKeyEvents();
return true;
default:
redispatchEvent(target, e);
return true;
}
}
/**
* Returns true if there are some marker associated with component <code>comp</code>
* in a markers' queue
* @since 1.5
*/
private boolean hasMarker(Component comp) {
for (Iterator<TypeAheadMarker> iter = typeAheadMarkers.iterator(); iter.hasNext(); ) {
if (iter.next().untilFocused == comp) {
return true;
}
}
return false;
}
/**
* Clears markers queue
* @since 1.5
*/
void clearMarkers() {
synchronized(this) {
typeAheadMarkers.clear();
}
}
private boolean preDispatchKeyEvent(KeyEvent ke) {
if (((AWTEvent) ke).isPosted) {
Component focusOwner = getFocusOwner();
ke.setSource(((focusOwner != null) ? focusOwner : getFocusedWindow()));
}
if (ke.getSource() == null) {
return true;
}
// Explicitly set the key event timestamp here (not in Component.dispatchEventImpl):
// - A key event is anyway passed to this method which starts its actual dispatching.
// - If a key event is put to the type ahead queue, its time stamp should not be registered
// until its dispatching actually starts (by this method).
EventQueue.setCurrentEventAndMostRecentTime(ke);
/**
* Fix for 4495473.
* This fix allows to correctly dispatch events when native
* event proxying mechanism is active.
* If it is active we should redispatch key events after
* we detected its correct target.
*/
if (KeyboardFocusManager.isProxyActive(ke)) {
Component source = (Component)ke.getSource();
Container target = source.getNativeContainer();
if (target != null) {
ComponentPeer peer = target.getPeer();
if (peer != null) {
peer.handleEvent(ke);
/**
* Fix for 4478780 - consume event after it was dispatched by peer.
*/
ke.consume();
}
}
return true;
}
java.util.List<KeyEventDispatcher> dispatchers = getKeyEventDispatchers();
if (dispatchers != null) {
for (java.util.Iterator<KeyEventDispatcher> iter = dispatchers.iterator();
iter.hasNext(); )
{
if (iter.next().
dispatchKeyEvent(ke))
{
return true;
}
}
}
return dispatchKeyEvent(ke);
}
/*
* @param e is a KEY_PRESSED event that can be used
* to track the next KEY_TYPED related.
*/
private void consumeNextKeyTyped(KeyEvent e) {
consumeNextKeyTyped = true;
}
private void consumeTraversalKey(KeyEvent e) {
e.consume();
consumeNextKeyTyped = (e.getID() == KeyEvent.KEY_PRESSED) &&
!e.isActionKey();
}
/*
* return true if event was consumed
*/
private boolean consumeProcessedKeyEvent(KeyEvent e) {
if ((e.getID() == KeyEvent.KEY_TYPED) && consumeNextKeyTyped) {
e.consume();
consumeNextKeyTyped = false;
return true;
}
return false;
}
/**
* 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 focus owner.
*
* @param focusedComponent the Component that is 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 void processKeyEvent(Component focusedComponent, KeyEvent e) {
// consume processed event if needed
if (consumeProcessedKeyEvent(e)) {
return;
}
// KEY_TYPED events cannot be focus traversal keys
if (e.getID() == KeyEvent.KEY_TYPED) {
return;
}
if (focusedComponent.getFocusTraversalKeysEnabled() &&
!e.isConsumed())
{
AWTKeyStroke stroke = AWTKeyStroke.getAWTKeyStrokeForEvent(e),
oppStroke = AWTKeyStroke.getAWTKeyStroke(stroke.getKeyCode(),
stroke.getModifiers(),
!stroke.isOnKeyRelease());
Set<AWTKeyStroke> toTest;
boolean contains, containsOpp;
toTest = focusedComponent.getFocusTraversalKeys(
KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS);
contains = toTest.contains(stroke);
containsOpp = toTest.contains(oppStroke);
if (contains || containsOpp) {
consumeTraversalKey(e);
if (contains) {
focusNextComponent(focusedComponent);
}
return;
} else if (e.getID() == KeyEvent.KEY_PRESSED) {
// Fix for 6637607: consumeNextKeyTyped should be reset.
consumeNextKeyTyped = false;
}
toTest = focusedComponent.getFocusTraversalKeys(
KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS);
contains = toTest.contains(stroke);
containsOpp = toTest.contains(oppStroke);
if (contains || containsOpp) {
consumeTraversalKey(e);
if (contains) {
focusPreviousComponent(focusedComponent);
}
return;
}
toTest = focusedComponent.getFocusTraversalKeys(
KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS);
contains = toTest.contains(stroke);
containsOpp = toTest.contains(oppStroke);
if (contains || containsOpp) {
consumeTraversalKey(e);
if (contains) {
upFocusCycle(focusedComponent);
}
return;
}
if (!((focusedComponent instanceof Container) &&
((Container)focusedComponent).isFocusCycleRoot())) {
return;
}
toTest = focusedComponent.getFocusTraversalKeys(
KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS);
contains = toTest.contains(stroke);
containsOpp = toTest.contains(oppStroke);
if (contains || containsOpp) {
consumeTraversalKey(e);
if (contains) {
downFocusCycle((Container)focusedComponent);
}
}
}
}
/**
* Delays dispatching of KeyEvents until the specified Component becomes
* the focus owner. KeyEvents with timestamps later than the specified
* timestamp will be enqueued 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 will receive a FOCUS_GAINED event
* before any pending KeyEvents
* @see #dequeueKeyEvents
* @see #discardKeyEvents
*/
protected synchronized void enqueueKeyEvents(long after,
Component untilFocused) {
if (untilFocused == null) {
return;
}
if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
focusLog.finer("Enqueue at {0} for {1}",
after, untilFocused);
}
int insertionIndex = 0,
i = typeAheadMarkers.size();
ListIterator<TypeAheadMarker> iter = typeAheadMarkers.listIterator(i);
for (; i > 0; i--) {
TypeAheadMarker marker = iter.previous();
if (marker.after <= after) {
insertionIndex = i;
break;
}
}
typeAheadMarkers.add(insertionIndex,
new TypeAheadMarker(after, untilFocused));
}
/**
* Releases for normal dispatching to the current focus owner all
* KeyEvents which were enqueued because of a call to
* <code>enqueueKeyEvents</code> with the same timestamp and Component.
* 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.
*
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