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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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1+/*
2+ * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+package javax.swing;
26+
27+import java.awt.Component;
28+import java.awt.Container;
29+import java.awt.Window;
30+import java.util.*;
31+import java.awt.FocusTraversalPolicy;
32+import sun.util.logging.PlatformLogger;
33+
34+/**
35+ * A FocusTraversalPolicy that determines traversal order by sorting the
36+ * Components of a focus traversal cycle based on a given Comparator. Portions
37+ * of the Component hierarchy that are not visible and displayable will not be
38+ * included.
39+ * <p>
40+ * By default, SortingFocusTraversalPolicy implicitly transfers focus down-
41+ * cycle. That is, during normal focus traversal, the Component
42+ * traversed after a focus cycle root will be the focus-cycle-root's default
43+ * Component to focus. This behavior can be disabled using the
44+ * <code>setImplicitDownCycleTraversal</code> method.
45+ * <p>
46+ * By default, methods of this class with return a Component only if it is
47+ * visible, displayable, enabled, and focusable. Subclasses can modify this
48+ * behavior by overriding the <code>accept</code> method.
49+ * <p>
50+ * This policy takes into account <a
51+ * href="../../java/awt/doc-files/FocusSpec.html#FocusTraversalPolicyProviders">focus traversal
52+ * policy providers</a>. When searching for first/last/next/previous Component,
53+ * if a focus traversal policy provider is encountered, its focus traversal
54+ * policy is used to perform the search operation.
55+ *
56+ * @author David Mendenhall
57+ *
58+ * @see java.util.Comparator
59+ * @since 1.4
60+ */
61+public class SortingFocusTraversalPolicy
62+ extends InternalFrameFocusTraversalPolicy
63+{
64+ private Comparator<? super Component> comparator;
65+ private boolean implicitDownCycleTraversal = true;
66+
67+ private PlatformLogger log = PlatformLogger.getLogger("javax.swing.SortingFocusTraversalPolicy");
68+
69+ /**
70+ * Used by getComponentAfter and getComponentBefore for efficiency. In
71+ * order to maintain compliance with the specification of
72+ * FocusTraversalPolicy, if traversal wraps, we should invoke
73+ * getFirstComponent or getLastComponent. These methods may be overriden in
74+ * subclasses to behave in a non-generic way. However, in the generic case,
75+ * these methods will simply return the first or last Components of the
76+ * sorted list, respectively. Since getComponentAfter and
77+ * getComponentBefore have already built the sorted list before determining
78+ * that they need to invoke getFirstComponent or getLastComponent, the
79+ * sorted list should be reused if possible.
80+ */
81+ transient private Container cachedRoot;
82+ transient private List<Component> cachedCycle;
83+
84+ // Delegate our fitness test to ContainerOrder so that we only have to
85+ // code the algorithm once.
86+ private static final SwingContainerOrderFocusTraversalPolicy
87+ fitnessTestPolicy = new SwingContainerOrderFocusTraversalPolicy();
88+
89+ final private int FORWARD_TRAVERSAL = 0;
90+ final private int BACKWARD_TRAVERSAL = 1;
91+
92+ /**
93+ * Constructs a SortingFocusTraversalPolicy without a Comparator.
94+ * Subclasses must set the Comparator using <code>setComparator</code>
95+ * before installing this FocusTraversalPolicy on a focus cycle root or
96+ * KeyboardFocusManager.
97+ */
98+ protected SortingFocusTraversalPolicy() {
99+ }
100+
101+ /**
102+ * Constructs a SortingFocusTraversalPolicy with the specified Comparator.
103+ */
104+ public SortingFocusTraversalPolicy(Comparator<? super Component> comparator) {
105+ this.comparator = comparator;
106+ }
107+
108+ private List<Component> getFocusTraversalCycle(Container aContainer) {
109+ List<Component> cycle = new ArrayList<Component>();
110+ enumerateAndSortCycle(aContainer, cycle);
111+ return cycle;
112+ }
113+ private int getComponentIndex(List<Component> cycle, Component aComponent) {
114+ int index;
115+ try {
116+ index = Collections.binarySearch(cycle, aComponent, comparator);
117+ } catch (ClassCastException e) {
118+ if (log.isLoggable(PlatformLogger.FINE)) {
119+ log.fine("### During the binary search for " + aComponent + " the exception occured: ", e);
120+ }
121+ return -1;
122+ }
123+ if (index < 0) {
124+ // Fix for 5070991.
125+ // A workaround for a transitivity problem caused by ROW_TOLERANCE,
126+ // because of that the component may be missed in the binary search.
127+ // Try to search it again directly.
128+ index = cycle.indexOf(aComponent);
129+ }
130+ return index;
131+ }
132+
133+ private void enumerateAndSortCycle(Container focusCycleRoot, List<Component> cycle) {
134+ if (focusCycleRoot.isShowing()) {
135+ enumerateCycle(focusCycleRoot, cycle);
136+ Collections.sort(cycle, comparator);
137+ }
138+ }
139+
140+ private void enumerateCycle(Container container, List<Component> cycle) {
141+ if (!(container.isVisible() && container.isDisplayable())) {
142+ return;
143+ }
144+
145+ cycle.add(container);
146+
147+ Component[] components = container.getComponents();
148+ for (Component comp : components) {
149+ if (comp instanceof Container) {
150+ Container cont = (Container)comp;
151+
152+ if (!cont.isFocusCycleRoot() &&
153+ !cont.isFocusTraversalPolicyProvider() &&
154+ !((cont instanceof JComponent) && ((JComponent)cont).isManagingFocus()))
155+ {
156+ enumerateCycle(cont, cycle);
157+ continue;
158+ }
159+ }
160+ cycle.add(comp);
161+ }
162+ }
163+
164+ Container getTopmostProvider(Container focusCycleRoot, Component aComponent) {
165+ Container aCont = aComponent.getParent();
166+ Container ftp = null;
167+ while (aCont != focusCycleRoot && aCont != null) {
168+ if (aCont.isFocusTraversalPolicyProvider()) {
169+ ftp = aCont;
170+ }
171+ aCont = aCont.getParent();
172+ }
173+ if (aCont == null) {
174+ return null;
175+ }
176+ return ftp;
177+ }
178+
179+ /*
180+ * Checks if a new focus cycle takes place and returns a Component to traverse focus to.
181+ * @param comp a possible focus cycle root or policy provider
182+ * @param traversalDirection the direction of the traversal
183+ * @return a Component to traverse focus to if {@code comp} is a root or provider
184+ * and implicit down-cycle is set, otherwise {@code null}
185+ */
186+ private Component getComponentDownCycle(Component comp, int traversalDirection) {
187+ Component retComp = null;
188+
189+ if (comp instanceof Container) {
190+ Container cont = (Container)comp;
191+
192+ if (cont.isFocusCycleRoot()) {
193+ if (getImplicitDownCycleTraversal()) {
194+ retComp = cont.getFocusTraversalPolicy().getDefaultComponent(cont);
195+
196+ if (retComp != null && log.isLoggable(PlatformLogger.FINE)) {
197+ log.fine("### Transfered focus down-cycle to " + retComp +
198+ " in the focus cycle root " + cont);
199+ }
200+ } else {
201+ return null;
202+ }
203+ } else if (cont.isFocusTraversalPolicyProvider()) {
204+ retComp = (traversalDirection == FORWARD_TRAVERSAL ?
205+ cont.getFocusTraversalPolicy().getDefaultComponent(cont) :
206+ cont.getFocusTraversalPolicy().getLastComponent(cont));
207+
208+ if (retComp != null && log.isLoggable(PlatformLogger.FINE)) {
209+ log.fine("### Transfered focus to " + retComp + " in the FTP provider " + cont);
210+ }
211+ }
212+ }
213+ return retComp;
214+ }
215+
216+ /**
217+ * Returns the Component that should receive the focus after aComponent.
218+ * aContainer must be a focus cycle root of aComponent or a focus traversal policy provider.
219+ * <p>
220+ * By default, SortingFocusTraversalPolicy implicitly transfers focus down-
221+ * cycle. That is, during normal focus traversal, the Component
222+ * traversed after a focus cycle root will be the focus-cycle-root's
223+ * default Component to focus. This behavior can be disabled using the
224+ * <code>setImplicitDownCycleTraversal</code> method.
225+ * <p>
226+ * If aContainer is <a href="../../java/awt/doc-files/FocusSpec.html#FocusTraversalPolicyProviders">focus
227+ * traversal policy provider</a>, the focus is always transferred down-cycle.
228+ *
229+ * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider
230+ * @param aComponent a (possibly indirect) child of aContainer, or
231+ * aContainer itself
232+ * @return the Component that should receive the focus after aComponent, or
233+ * null if no suitable Component can be found
234+ * @throws IllegalArgumentException if aContainer is not a focus cycle
235+ * root of aComponent or a focus traversal policy provider, or if either aContainer or
236+ * aComponent is null
237+ */
238+ public Component getComponentAfter(Container aContainer, Component aComponent) {
239+ if (log.isLoggable(PlatformLogger.FINE)) {
240+ log.fine("### Searching in " + aContainer + " for component after " + aComponent);
241+ }
242+
243+ if (aContainer == null || aComponent == null) {
244+ throw new IllegalArgumentException("aContainer and aComponent cannot be null");
245+ }
246+ if (!aContainer.isFocusTraversalPolicyProvider() && !aContainer.isFocusCycleRoot()) {
247+ throw new IllegalArgumentException("aContainer should be focus cycle root or focus traversal policy provider");
248+
249+ } else if (aContainer.isFocusCycleRoot() && !aComponent.isFocusCycleRoot(aContainer)) {
250+ throw new IllegalArgumentException("aContainer is not a focus cycle root of aComponent");
251+ }
252+
253+ // Before all the ckecks below we first see if it's an FTP provider or a focus cycle root.
254+ // If it's the case just go down cycle (if it's set to "implicit").
255+ Component comp = getComponentDownCycle(aComponent, FORWARD_TRAVERSAL);
256+ if (comp != null) {
257+ return comp;
258+ }
259+
260+ // See if the component is inside of policy provider.
261+ Container provider = getTopmostProvider(aContainer, aComponent);
262+ if (provider != null) {
263+ if (log.isLoggable(PlatformLogger.FINE)) {
264+ log.fine("### Asking FTP " + provider + " for component after " + aComponent);
265+ }
266+
267+ // FTP knows how to find component after the given. We don't.
268+ FocusTraversalPolicy policy = provider.getFocusTraversalPolicy();
269+ Component afterComp = policy.getComponentAfter(provider, aComponent);
270+
271+ // Null result means that we overstepped the limit of the FTP's cycle.
272+ // In that case we must quit the cycle, otherwise return the component found.
273+ if (afterComp != null) {
274+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### FTP returned " + afterComp);
275+ return afterComp;
276+ }
277+ aComponent = provider;
278+ }
279+
280+ List<Component> cycle = getFocusTraversalCycle(aContainer);
281+
282+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle + ", component is " + aComponent);
283+
284+ int index = getComponentIndex(cycle, aComponent);
285+
286+ if (index < 0) {
287+ if (log.isLoggable(PlatformLogger.FINE)) {
288+ log.fine("### Didn't find component " + aComponent + " in a cycle " + aContainer);
289+ }
290+ return getFirstComponent(aContainer);
291+ }
292+
293+ for (index++; index < cycle.size(); index++) {
294+ comp = cycle.get(index);
295+ if (accept(comp)) {
296+ return comp;
297+ } else if ((comp = getComponentDownCycle(comp, FORWARD_TRAVERSAL)) != null) {
298+ return comp;
299+ }
300+ }
301+
302+ if (aContainer.isFocusCycleRoot()) {
303+ this.cachedRoot = aContainer;
304+ this.cachedCycle = cycle;
305+
306+ comp = getFirstComponent(aContainer);
307+
308+ this.cachedRoot = null;
309+ this.cachedCycle = null;
310+
311+ return comp;
312+ }
313+ return null;
314+ }
315+
316+ /**
317+ * Returns the Component that should receive the focus before aComponent.
318+ * aContainer must be a focus cycle root of aComponent or a focus traversal policy provider.
319+ * <p>
320+ * By default, SortingFocusTraversalPolicy implicitly transfers focus down-
321+ * cycle. That is, during normal focus traversal, the Component
322+ * traversed after a focus cycle root will be the focus-cycle-root's
323+ * default Component to focus. This behavior can be disabled using the
324+ * <code>setImplicitDownCycleTraversal</code> method.
325+ * <p>
326+ * If aContainer is <a href="../../java/awt/doc-files/FocusSpec.html#FocusTraversalPolicyProviders">focus
327+ * traversal policy provider</a>, the focus is always transferred down-cycle.
328+ *
329+ * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider
330+ * @param aComponent a (possibly indirect) child of aContainer, or
331+ * aContainer itself
332+ * @return the Component that should receive the focus before aComponent,
333+ * or null if no suitable Component can be found
334+ * @throws IllegalArgumentException if aContainer is not a focus cycle
335+ * root of aComponent or a focus traversal policy provider, or if either aContainer or
336+ * aComponent is null
337+ */
338+ public Component getComponentBefore(Container aContainer, Component aComponent) {
339+ if (aContainer == null || aComponent == null) {
340+ throw new IllegalArgumentException("aContainer and aComponent cannot be null");
341+ }
342+ if (!aContainer.isFocusTraversalPolicyProvider() && !aContainer.isFocusCycleRoot()) {
343+ throw new IllegalArgumentException("aContainer should be focus cycle root or focus traversal policy provider");
344+
345+ } else if (aContainer.isFocusCycleRoot() && !aComponent.isFocusCycleRoot(aContainer)) {
346+ throw new IllegalArgumentException("aContainer is not a focus cycle root of aComponent");
347+ }
348+
349+ // See if the component is inside of policy provider.
350+ Container provider = getTopmostProvider(aContainer, aComponent);
351+ if (provider != null) {
352+ if (log.isLoggable(PlatformLogger.FINE)) {
353+ log.fine("### Asking FTP " + provider + " for component after " + aComponent);
354+ }
355+
356+ // FTP knows how to find component after the given. We don't.
357+ FocusTraversalPolicy policy = provider.getFocusTraversalPolicy();
358+ Component beforeComp = policy.getComponentBefore(provider, aComponent);
359+
360+ // Null result means that we overstepped the limit of the FTP's cycle.
361+ // In that case we must quit the cycle, otherwise return the component found.
362+ if (beforeComp != null) {
363+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### FTP returned " + beforeComp);
364+ return beforeComp;
365+ }
366+ aComponent = provider;
367+
368+ // If the provider is traversable it's returned.
369+ if (accept(aComponent)) {
370+ return aComponent;
371+ }
372+ }
373+
374+ List<Component> cycle = getFocusTraversalCycle(aContainer);
375+
376+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle + ", component is " + aComponent);
377+
378+ int index = getComponentIndex(cycle, aComponent);
379+
380+ if (index < 0) {
381+ if (log.isLoggable(PlatformLogger.FINE)) {
382+ log.fine("### Didn't find component " + aComponent + " in a cycle " + aContainer);
383+ }
384+ return getLastComponent(aContainer);
385+ }
386+
387+ Component comp;
388+ Component tryComp;
389+
390+ for (index--; index>=0; index--) {
391+ comp = cycle.get(index);
392+ if (comp != aContainer && (tryComp = getComponentDownCycle(comp, BACKWARD_TRAVERSAL)) != null) {
393+ return tryComp;
394+ } else if (accept(comp)) {
395+ return comp;
396+ }
397+ }
398+
399+ if (aContainer.isFocusCycleRoot()) {
400+ this.cachedRoot = aContainer;
401+ this.cachedCycle = cycle;
402+
403+ comp = getLastComponent(aContainer);
404+
405+ this.cachedRoot = null;
406+ this.cachedCycle = null;
407+
408+ return comp;
409+ }
410+ return null;
411+ }
412+
413+ /**
414+ * Returns the first Component in the traversal cycle. This method is used
415+ * to determine the next Component to focus when traversal wraps in the
416+ * forward direction.
417+ *
418+ * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider whose
419+ * first Component is to be returned
420+ * @return the first Component in the traversal cycle of aContainer,
421+ * or null if no suitable Component can be found
422+ * @throws IllegalArgumentException if aContainer is null
423+ */
424+ public Component getFirstComponent(Container aContainer) {
425+ List<Component> cycle;
426+
427+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Getting first component in " + aContainer);
428+ if (aContainer == null) {
429+ throw new IllegalArgumentException("aContainer cannot be null");
430+ }
431+
432+ if (this.cachedRoot == aContainer) {
433+ cycle = this.cachedCycle;
434+ } else {
435+ cycle = getFocusTraversalCycle(aContainer);
436+ }
437+
438+ if (cycle.size() == 0) {
439+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is empty");
440+ return null;
441+ }
442+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle);
443+
444+ for (Component comp : cycle) {
445+ if (accept(comp)) {
446+ return comp;
447+ } else if (comp != aContainer &&
448+ (comp = getComponentDownCycle(comp, FORWARD_TRAVERSAL)) != null)
449+ {
450+ return comp;
451+ }
452+ }
453+ return null;
454+ }
455+
456+ /**
457+ * Returns the last Component in the traversal cycle. This method is used
458+ * to determine the next Component to focus when traversal wraps in the
459+ * reverse direction.
460+ *
461+ * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider whose
462+ * last Component is to be returned
463+ * @return the last Component in the traversal cycle of aContainer,
464+ * or null if no suitable Component can be found
465+ * @throws IllegalArgumentException if aContainer is null
466+ */
467+ public Component getLastComponent(Container aContainer) {
468+ List<Component> cycle;
469+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Getting last component in " + aContainer);
470+
471+ if (aContainer == null) {
472+ throw new IllegalArgumentException("aContainer cannot be null");
473+ }
474+
475+ if (this.cachedRoot == aContainer) {
476+ cycle = this.cachedCycle;
477+ } else {
478+ cycle = getFocusTraversalCycle(aContainer);
479+ }
480+
481+ if (cycle.size() == 0) {
482+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is empty");
483+ return null;
484+ }
485+ if (log.isLoggable(PlatformLogger.FINE)) log.fine("### Cycle is " + cycle);
486+
487+ for (int i= cycle.size() - 1; i >= 0; i--) {
488+ Component comp = cycle.get(i);
489+ if (accept(comp)) {
490+ return comp;
491+ } else if (comp instanceof Container && comp != aContainer) {
492+ Container cont = (Container)comp;
493+ if (cont.isFocusTraversalPolicyProvider()) {
494+ return cont.getFocusTraversalPolicy().getLastComponent(cont);
495+ }
496+ }
497+ }
498+ return null;
499+ }
500+
501+ /**
502+ * Returns the default Component to focus. This Component will be the first
503+ * to receive focus when traversing down into a new focus traversal cycle
504+ * rooted at aContainer. The default implementation of this method
505+ * returns the same Component as <code>getFirstComponent</code>.
506+ *
507+ * @param aContainer a focus cycle root of aComponent or a focus traversal policy provider whose
508+ * default Component is to be returned
509+ * @return the default Component in the traversal cycle of aContainer,
510+ * or null if no suitable Component can be found
511+ * @see #getFirstComponent
512+ * @throws IllegalArgumentException if aContainer is null
513+ */
514+ public Component getDefaultComponent(Container aContainer) {
515+ return getFirstComponent(aContainer);
516+ }
517+
518+ /**
519+ * Sets whether this SortingFocusTraversalPolicy transfers focus down-cycle
520+ * implicitly. If <code>true</code>, during normal focus traversal,
521+ * the Component traversed after a focus cycle root will be the focus-
522+ * cycle-root's default Component to focus. If <code>false</code>, the
523+ * next Component in the focus traversal cycle rooted at the specified
524+ * focus cycle root will be traversed instead. The default value for this
525+ * property is <code>true</code>.
526+ *
527+ * @param implicitDownCycleTraversal whether this
528+ * SortingFocusTraversalPolicy transfers focus down-cycle implicitly
529+ * @see #getImplicitDownCycleTraversal
530+ * @see #getFirstComponent
531+ */
532+ public void setImplicitDownCycleTraversal(boolean implicitDownCycleTraversal) {
533+ this.implicitDownCycleTraversal = implicitDownCycleTraversal;
534+ }
535+
536+ /**
537+ * Returns whether this SortingFocusTraversalPolicy transfers focus down-
538+ * cycle implicitly. If <code>true</code>, during normal focus
539+ * traversal, the Component traversed after a focus cycle root will be the
540+ * focus-cycle-root's default Component to focus. If <code>false</code>,
541+ * the next Component in the focus traversal cycle rooted at the specified
542+ * focus cycle root will be traversed instead.
543+ *
544+ * @return whether this SortingFocusTraversalPolicy transfers focus down-
545+ * cycle implicitly
546+ * @see #setImplicitDownCycleTraversal
547+ * @see #getFirstComponent
548+ */
549+ public boolean getImplicitDownCycleTraversal() {
550+ return implicitDownCycleTraversal;
551+ }
552+
553+ /**
554+ * Sets the Comparator which will be used to sort the Components in a
555+ * focus traversal cycle.
556+ *
557+ * @param comparator the Comparator which will be used for sorting
558+ */
559+ protected void setComparator(Comparator<? super Component> comparator) {
560+ this.comparator = comparator;
561+ }
562+
563+ /**
564+ * Returns the Comparator which will be used to sort the Components in a
565+ * focus traversal cycle.
566+ *
567+ * @return the Comparator which will be used for sorting
568+ */
569+ protected Comparator<? super Component> getComparator() {
570+ return comparator;
571+ }
572+
573+ /**
574+ * Determines whether a Component is an acceptable choice as the new
575+ * focus owner. By default, this method will accept a Component if and
576+ * only if it is visible, displayable, enabled, and focusable.
577+ *
578+ * @param aComponent the Component whose fitness as a focus owner is to
579+ * be tested
580+ * @return <code>true</code> if aComponent is visible, displayable,
581+ * enabled, and focusable; <code>false</code> otherwise
582+ */
583+ protected boolean accept(Component aComponent) {
584+ return fitnessTestPolicy.accept(aComponent);
585+ }
586+}
587+
588+// Create our own subclass and change accept to public so that we can call
589+// accept.
590+class SwingContainerOrderFocusTraversalPolicy
591+ extends java.awt.ContainerOrderFocusTraversalPolicy
592+{
593+ public boolean accept(Component aComponent) {
594+ return super.accept(aComponent);
595+ }
596+}