summaryrefslogtreecommitdiff
path: root/libjava/classpath/gnu/java/awt/AWTUtilities.java
blob: 1b308cef48667131d58ce2dcd31d4e8207d43ac1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
/* AWTUtilities.java -- Common utility methods for AWT and Swing.
   Copyright (C) 2005, 2007  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU Classpath 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 for more details.

You should have received a copy of the GNU General Public License
along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
module.  An independent module is a module which is not derived from
or based on this library.  If you modify this library, you may extend
this exception to your version of the library, but you are not
obligated to do so.  If you do not wish to do so, delete this
exception statement from your version. */

package gnu.java.awt;

import java.applet.Applet;
import java.awt.Component;
import java.awt.Container;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.util.AbstractSequentialList;
import java.util.List;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import java.util.WeakHashMap;
import java.lang.reflect.InvocationTargetException;

/**
 * This class mirrors the javax.swing.SwingUtilities class. It
 * provides commonly needed functionalities for AWT classes without
 * the need to reference classes in the javax.swing package.
 */
public class AWTUtilities
{

  /**
   * This List implementation wraps the Component[] returned by
   * {@link Container#getComponents()} and iterates over the visible Components
   * in that array. This class is used in {@link #getVisibleChildren}.
   */
  static class VisibleComponentList extends AbstractSequentialList
  {
    /**
     * The ListIterator for this List.
     */
    class VisibleComponentIterator implements ListIterator
    {
      /** The current index in the Component[]. */
      int index;

      /** The index in the List of visible Components. */
      int listIndex;

      /**
       * Creates a new VisibleComponentIterator that starts at the specified
       * <code>listIndex</code>. The array of Components is searched from
       * the beginning to find the matching array index.
       *
       * @param listIndex the index from where to begin iterating
       */
      VisibleComponentIterator(int listIndex)
      {
        this.listIndex = listIndex;
        int visibleComponentsFound = 0;
        for (index = 0; visibleComponentsFound != listIndex; index++)
          {
            if (components[index].isVisible())
              visibleComponentsFound++;
          }
      }

      /**
       * Returns <code>true</code> if there are more visible components in the
       * array, <code>false</code> otherwise.
       *
       * @return <code>true</code> if there are more visible components in the
       *     array, <code>false</code> otherwise
       */
      public boolean hasNext()
      {
        boolean hasNext = false;
        for (int i = index; i < components.length; i++)
          {
            if (components[i].isVisible())
              {
                hasNext = true;
                break;
              }
          }
        return hasNext;
      }

      /**
       * Returns the next visible <code>Component</code> in the List.
       *
       * @return the next visible <code>Component</code> in the List
       *
       * @throws NoSuchElementException if there is no next element
       */
      public Object next()
      {
        Object o = null;
        for (; index < components.length; index++)
          {
            if (components[index].isVisible())
              {
                o = components[index];
                break;
              }
          }
        if (o != null)
          {
            index++;
            listIndex++;
            return o;
          }
        else
          throw new NoSuchElementException();
      }

      /**
       * Returns <code>true</code> if there are more visible components in the
       * array in the reverse direction, <code>false</code> otherwise.
       *
       * @return <code>true</code> if there are more visible components in the
       *     array in the reverse direction, <code>false</code> otherwise
       */
      public boolean hasPrevious()
      {
        boolean hasPrevious = false;
        for (int i = index - 1; i >= 0; i--)
          {
            if (components[i].isVisible())
              {
                hasPrevious = true;
                break;
              }
          }
        return hasPrevious;
      }

      /**
       * Returns the previous visible <code>Component</code> in the List.
       *
       * @return the previous visible <code>Component</code> in the List
       *
       * @throws NoSuchElementException if there is no previous element
       */
      public Object previous()
      {
        Object o = null;
        for (index--; index >= 0; index--)
          {
            if (components[index].isVisible())
              {
                o = components[index];
                break;
              }
          }
        if (o != null)
          {
            listIndex--;
            return o;
          }
        else
          throw new NoSuchElementException();
      }

      /**
       * Returns the index of the next element in the List.
       *
       * @return the index of the next element in the List
       */
      public int nextIndex()
      {
        return listIndex + 1;
      }

      /**
       * Returns the index of the previous element in the List.
       *
       * @return the index of the previous element in the List
       */
      public int previousIndex()
      {
        return listIndex - 1;
      }

      /**
       * This operation is not supported because the List is immutable.
       *
       * @throws UnsupportedOperationException because the List is immutable
       */
      public void remove()
      {
        throw new UnsupportedOperationException
          ("VisibleComponentList is immutable");
      }

      /**
       * This operation is not supported because the List is immutable.
       *
       * @param o not used here
       *
       * @throws UnsupportedOperationException because the List is immutable
       */
      public void set(Object o)
      {
        throw new UnsupportedOperationException
          ("VisibleComponentList is immutable");
      }

      /**
       * This operation is not supported because the List is immutable.
       *
       * @param o not used here
       *
       * @throws UnsupportedOperationException because the List is immutable
       */
      public void add(Object o)
      {
        throw new UnsupportedOperationException
          ("VisibleComponentList is immutable");
      }
    }

    /**
     * The components over which we iterate. Only the visible components
     * are returned by this List.
     */
    Component[] components;

    /**
     * Creates a new instance of VisibleComponentList that wraps the specified
     * <code>Component[]</code>.
     *
     * @param c the <code>Component[]</code> to be wrapped.
     */
    VisibleComponentList(Component[] c)
    {
      components = c;
    }

    /**
     * Returns a {@link ListIterator} for iterating over this List.
     *
     * @return a {@link ListIterator} for iterating over this List
     */
    public ListIterator listIterator(int index)
    {
      return new VisibleComponentIterator(index);
    }

    /**
     * Returns the number of visible components in the wrapped Component[].
     *
     * @return the number of visible components
     */
    public int size()
    {
      int visibleComponents = 0;
      for (int i = 0; i < components.length; i++)
        if (components[i].isVisible())
          visibleComponents++;
      return visibleComponents;
    }
  }

  /**
   * The cache for our List instances. We try to hold one instance of
   * VisibleComponentList for each Component[] that is requested. Note
   * that we use a WeakHashMap for caching, so that the cache itself
   * does not keep the array or the List from beeing garbage collected
   * if no other objects hold references to it.
   */
  static WeakHashMap visibleChildrenCache = new WeakHashMap();

  /**
   * Returns the visible children of a {@link Container}. This method is
   * commonly needed in LayoutManagers, because they only have to layout
   * the visible children of a Container.
   *
   * @param c the Container from which to extract the visible children
   *
   * @return the visible children of <code>c</code>
   */
  public static List getVisibleChildren(Container c)
  {
    Component[] children = c.getComponents();
    Object o = visibleChildrenCache.get(children);
    VisibleComponentList visibleChildren = null;
    if (o == null)
      {
        visibleChildren = new VisibleComponentList(children);
        visibleChildrenCache.put(children, visibleChildren);
      }
    else
      visibleChildren = (VisibleComponentList) o;

    return visibleChildren;
  }

  /**
   * Calculates the portion of the base rectangle which is inside the
   * insets.
   *
   * @param base The rectangle to apply the insets to
   * @param insets The insets to apply to the base rectangle
   * @param ret A rectangle to use for storing the return value, or
   * <code>null</code>
   *
   * @return The calculated area inside the base rectangle and its insets,
   * either stored in ret or a new Rectangle if ret is <code>null</code>
   *
   * @see #calculateInnerArea
   */
  public static Rectangle calculateInsetArea(Rectangle base, Insets insets,
                                             Rectangle ret)
  {
    if (ret == null)
      ret = new Rectangle();
    ret.setBounds(base.x + insets.left, base.y + insets.top,
        base.width - (insets.left + insets.right),
        base.height - (insets.top + insets.bottom));
    return ret;
  }

  /**
   * Calculates the bounds of a component in the component's own coordinate
   * space. The result has the same height and width as the component's
   * bounds, but its location is set to (0,0).
   *
   * @param aComponent The component to measure
   *
   * @return The component's bounds in its local coordinate space
   */
  public static Rectangle getLocalBounds(Component aComponent)
  {
    Rectangle bounds = aComponent.getBounds();
    return new Rectangle(0, 0, bounds.width, bounds.height);
  }

  /**
   * Returns the font metrics object for a given font. The metrics can be
   * used to calculate crude bounding boxes and positioning information,
   * for laying out components with textual elements.
   *
   * @param font The font to get metrics for
   *
   * @return The font's metrics
   *
   * @see java.awt.font.GlyphMetrics
   */
  public static FontMetrics getFontMetrics(Font font)
  {
    return Toolkit.getDefaultToolkit().getFontMetrics(font);
  }

  /**
   * Returns the least ancestor of <code>comp</code> which has the
   * specified name.
   *
   * @param name The name to search for
   * @param comp The component to search the ancestors of
   *
   * @return The nearest ancestor of <code>comp</code> with the given
   * name, or <code>null</code> if no such ancestor exists
   *
   * @see java.awt.Component#getName
   * @see #getAncestorOfClass
   */
  public static Container getAncestorNamed(String name, Component comp)
  {
    while (comp != null && (comp.getName() != name))
      comp = comp.getParent();
    return (Container) comp;
  }

  /**
   * Returns the least ancestor of <code>comp</code> which is an instance
   * of the specified class.
   *
   * @param c The class to search for
   * @param comp The component to search the ancestors of
   *
   * @return The nearest ancestor of <code>comp</code> which is an instance
   * of the given class, or <code>null</code> if no such ancestor exists
   *
   * @see #getAncestorOfClass
   * @see #windowForComponent
   * @see
   *
   */
  public static Container getAncestorOfClass(Class c, Component comp)
  {
    while (comp != null && (! c.isInstance(comp)))
      comp = comp.getParent();
    return (Container) comp;
  }

  /**
   * Equivalent to calling <code>getAncestorOfClass(Window, comp)</code>.
   *
   * @param comp The component to search for an ancestor window
   *
   * @return An ancestral window, or <code>null</code> if none exists
   */
  public static Window windowForComponent(Component comp)
  {
    return (Window) getAncestorOfClass(Window.class, comp);
  }

  /**
   * Returns the "root" of the component tree containint <code>comp</code>
   * The root is defined as either the <em>least</em> ancestor of
   * <code>comp</code> which is a {@link Window}, or the <em>greatest</em>
   * ancestor of <code>comp</code> which is a {@link Applet} if no {@link
   * Window} ancestors are found.
   *
   * @param comp The component to search for a root
   *
   * @return The root of the component's tree, or <code>null</code>
   */
  public static Component getRoot(Component comp)
  {
    Applet app = null;
    Window win = null;

    while (comp != null)
     {
      if (win == null && comp instanceof Window)
        win = (Window) comp;
      else if (comp instanceof Applet)
        app = (Applet) comp;
      comp = comp.getParent();
    }

    if (win != null)
      return win;
    else
      return app;
  }

  /**
   * Return true if a descends from b, in other words if b is an
   * ancestor of a.
   *
   * @param a The child to search the ancestry of
   * @param b The potential ancestor to search for
   *
   * @return true if a is a descendent of b, false otherwise
   */
  public static boolean isDescendingFrom(Component a, Component b)
  {
    while (true)
     {
      if (a == null || b == null)
        return false;
      if (a == b)
        return true;
      a = a.getParent();
    }
  }

  /**
   * Returns the deepest descendent of parent which is both visible and
   * contains the point <code>(x,y)</code>. Returns parent when either
   * parent is not a container, or has no children which contain
   * <code>(x,y)</code>. Returns <code>null</code> when either
   * <code>(x,y)</code> is outside the bounds of parent, or parent is
   * <code>null</code>.
   *
   * @param parent The component to search the descendents of
   * @param x Horizontal coordinate to search for
   * @param y Vertical coordinate to search for
   *
   * @return A component containing <code>(x,y)</code>, or
   * <code>null</code>
   *
   * @see java.awt.Container#findComponentAt
   */
  public static Component getDeepestComponentAt(Component parent, int x, int y)
  {
    if (parent == null || (! parent.contains(x, y)))
      return null;

    if (! (parent instanceof Container))
      return parent;

    Container c = (Container) parent;
    return c.findComponentAt(x, y);
  }

  /**
   * Converts a point from a component's local coordinate space to "screen"
   * coordinates (such as the coordinate space mouse events are delivered
   * in). This operation is equivalent to translating the point by the
   * location of the component (which is the origin of its coordinate
   * space).
   *
   * @param p The point to convert
   * @param c The component which the point is expressed in terms of
   *
   * @see convertPointFromScreen
   */
  public static void convertPointToScreen(Point p, Component c)
  {
    Point c0 = c.getLocationOnScreen();
    p.translate(c0.x, c0.y);
  }

  /**
   * Converts a point from "screen" coordinates (such as the coordinate
   * space mouse events are delivered in) to a component's local coordinate
   * space. This operation is equivalent to translating the point by the
   * negation of the component's location (which is the origin of its
   * coordinate space).
   *
   * @param p The point to convert
   * @param c The component which the point should be expressed in terms of
   */
  public static void convertPointFromScreen(Point p, Component c)
  {
    Point c0 = c.getLocationOnScreen();
    p.translate(-c0.x, -c0.y);
  }

  /**
   * Converts a point <code>(x,y)</code> from the coordinate space of one
   * component to another. This is equivalent to converting the point from
   * <code>source</code> space to screen space, then back from screen space
   * to <code>destination</code> space. If exactly one of the two
   * Components is <code>null</code>, it is taken to refer to the root
   * ancestor of the other component. If both are <code>null</code>, no
   * transformation is done.
   *
   * @param source The component which the point is expressed in terms of
   * @param x Horizontal coordinate of point to transform
   * @param y Vertical coordinate of point to transform
   * @param destination The component which the return value will be
   * expressed in terms of
   *
   * @return The point <code>(x,y)</code> converted from the coordinate
   *         space of the
   * source component to the coordinate space of the destination component
   *
   * @see #convertPointToScreen
   * @see #convertPointFromScreen
   * @see #convertRectangle
   * @see #getRoot
   */
  public static Point convertPoint(Component source, int x, int y,
                                   Component destination)
  {
    Point pt = new Point(x, y);

    if (source == null && destination == null)
      return pt;

    if (source == null)
      source = getRoot(destination);

    if (destination == null)
      destination = getRoot(source);

    if (source.isShowing() && destination.isShowing())
      {
        convertPointToScreen(pt, source);
        convertPointFromScreen(pt, destination);
      }

    return pt;
  }


  /**
   * Converts a rectangle from the coordinate space of one component to
   * another. This is equivalent to converting the rectangle from
   * <code>source</code> space to screen space, then back from screen space
   * to <code>destination</code> space. If exactly one of the two
   * Components is <code>null</code>, it is taken to refer to the root
   * ancestor of the other component. If both are <code>null</code>, no
   * transformation is done.
   *
   * @param source The component which the rectangle is expressed in terms of
   * @param rect The rectangle to convert
   * @param destination The component which the return value will be
   * expressed in terms of
   *
   * @return A new rectangle, equal in size to the input rectangle, but
   * with its position converted from the coordinate space of the source
   * component to the coordinate space of the destination component
   *
   * @see #convertPointToScreen
   * @see #convertPointFromScreen
   * @see #convertPoint
   * @see #getRoot
   */
  public static Rectangle convertRectangle(Component source, Rectangle rect,
                                           Component destination)
  {
    Point pt = convertPoint(source, rect.x, rect.y, destination);
    return new Rectangle(pt.x, pt.y, rect.width, rect.height);
  }

  /**
   * Convert a mouse event which refrers to one component to another.  This
   * includes changing the mouse event's coordinate space, as well as the
   * source property of the event. If <code>source</code> is
   * <code>null</code>, it is taken to refer to <code>destination</code>'s
   * root component. If <code>destination</code> is <code>null</code>, the
   * new event will remain expressed in <code>source</code>'s coordinate
   * system.
   *
   * @param source The component the mouse event currently refers to
   * @param sourceEvent The mouse event to convert
   * @param destination The component the new mouse event should refer to
   *
   * @return A new mouse event expressed in terms of the destination
   * component's coordinate space, and with the destination component as
   * its source
   *
   * @see #convertPoint
   */
  public static MouseEvent convertMouseEvent(Component source,
                                             MouseEvent sourceEvent,
                                             Component destination)
  {
    Point newpt = convertPoint(source, sourceEvent.getX(), sourceEvent.getY(),
                               destination);

    return new MouseEvent(destination, sourceEvent.getID(),
                          sourceEvent.getWhen(), sourceEvent.getModifiers(),
                          newpt.x, newpt.y, sourceEvent.getClickCount(),
                          sourceEvent.isPopupTrigger(),
                          sourceEvent.getButton());
  }


  /**
   * Calls {@link java.awt.EventQueue.invokeLater} with the
   * specified {@link Runnable}.
   */
  public static void invokeLater(Runnable doRun)
  {
    java.awt.EventQueue.invokeLater(doRun);
  }

  /**
   * Calls {@link java.awt.EventQueue.invokeAndWait} with the
   * specified {@link Runnable}.
   */
  public static void invokeAndWait(Runnable doRun)
  throws InterruptedException,
  InvocationTargetException
  {
    java.awt.EventQueue.invokeAndWait(doRun);
  }

  /**
   * Calls {@link java.awt.EventQueue.isEventDispatchThread}.
   */
  public static boolean isEventDispatchThread()
  {
    return java.awt.EventQueue.isDispatchThread();
  }

  /**
   * Returns whether the specified key code is valid.
   */
  public static boolean isValidKey(int keyCode)
  {
    switch (keyCode)
      {
      case KeyEvent.VK_ENTER:
      case KeyEvent.VK_BACK_SPACE:
      case KeyEvent.VK_TAB:
      case KeyEvent.VK_CANCEL:
      case KeyEvent.VK_CLEAR:
      case KeyEvent.VK_SHIFT:
      case KeyEvent.VK_CONTROL:
      case KeyEvent.VK_ALT:
      case KeyEvent.VK_PAUSE:
      case KeyEvent.VK_CAPS_LOCK:
      case KeyEvent.VK_ESCAPE:
      case KeyEvent.VK_SPACE:
      case KeyEvent.VK_PAGE_UP:
      case KeyEvent.VK_PAGE_DOWN:
      case KeyEvent.VK_END:
      case KeyEvent.VK_HOME:
      case KeyEvent.VK_LEFT:
      case KeyEvent.VK_UP:
      case KeyEvent.VK_RIGHT:
      case KeyEvent.VK_DOWN:
      case KeyEvent.VK_COMMA:
      case KeyEvent.VK_MINUS:
      case KeyEvent.VK_PERIOD:
      case KeyEvent.VK_SLASH:
      case KeyEvent.VK_0:
      case KeyEvent.VK_1:
      case KeyEvent.VK_2:
      case KeyEvent.VK_3:
      case KeyEvent.VK_4:
      case KeyEvent.VK_5:
      case KeyEvent.VK_6:
      case KeyEvent.VK_7:
      case KeyEvent.VK_8:
      case KeyEvent.VK_9:
      case KeyEvent.VK_SEMICOLON:
      case KeyEvent.VK_EQUALS:
      case KeyEvent.VK_A:
      case KeyEvent.VK_B:
      case KeyEvent.VK_C:
      case KeyEvent.VK_D:
      case KeyEvent.VK_E:
      case KeyEvent.VK_F:
      case KeyEvent.VK_G:
      case KeyEvent.VK_H:
      case KeyEvent.VK_I:
      case KeyEvent.VK_J:
      case KeyEvent.VK_K:
      case KeyEvent.VK_L:
      case KeyEvent.VK_M:
      case KeyEvent.VK_N:
      case KeyEvent.VK_O:
      case KeyEvent.VK_P:
      case KeyEvent.VK_Q:
      case KeyEvent.VK_R:
      case KeyEvent.VK_S:
      case KeyEvent.VK_T:
      case KeyEvent.VK_U:
      case KeyEvent.VK_V:
      case KeyEvent.VK_W:
      case KeyEvent.VK_X:
      case KeyEvent.VK_Y:
      case KeyEvent.VK_Z:
      case KeyEvent.VK_OPEN_BRACKET:
      case KeyEvent.VK_BACK_SLASH:
      case KeyEvent.VK_CLOSE_BRACKET:
      case KeyEvent.VK_NUMPAD0:
      case KeyEvent.VK_NUMPAD1:
      case KeyEvent.VK_NUMPAD2:
      case KeyEvent.VK_NUMPAD3:
      case KeyEvent.VK_NUMPAD4:
      case KeyEvent.VK_NUMPAD5:
      case KeyEvent.VK_NUMPAD6:
      case KeyEvent.VK_NUMPAD7:
      case KeyEvent.VK_NUMPAD8:
      case KeyEvent.VK_NUMPAD9:
      case KeyEvent.VK_MULTIPLY:
      case KeyEvent.VK_ADD:
      case KeyEvent.VK_SEPARATOR:
      case KeyEvent.VK_SUBTRACT:
      case KeyEvent.VK_DECIMAL:
      case KeyEvent.VK_DIVIDE:
      case KeyEvent.VK_DELETE:
      case KeyEvent.VK_NUM_LOCK:
      case KeyEvent.VK_SCROLL_LOCK:
      case KeyEvent.VK_F1:
      case KeyEvent.VK_F2:
      case KeyEvent.VK_F3:
      case KeyEvent.VK_F4:
      case KeyEvent.VK_F5:
      case KeyEvent.VK_F6:
      case KeyEvent.VK_F7:
      case KeyEvent.VK_F8:
      case KeyEvent.VK_F9:
      case KeyEvent.VK_F10:
      case KeyEvent.VK_F11:
      case KeyEvent.VK_F12:
      case KeyEvent.VK_F13:
      case KeyEvent.VK_F14:
      case KeyEvent.VK_F15:
      case KeyEvent.VK_F16:
      case KeyEvent.VK_F17:
      case KeyEvent.VK_F18:
      case KeyEvent.VK_F19:
      case KeyEvent.VK_F20:
      case KeyEvent.VK_F21:
      case KeyEvent.VK_F22:
      case KeyEvent.VK_F23:
      case KeyEvent.VK_F24:
      case KeyEvent.VK_PRINTSCREEN:
      case KeyEvent.VK_INSERT:
      case KeyEvent.VK_HELP:
      case KeyEvent.VK_META:
      case KeyEvent.VK_BACK_QUOTE:
      case KeyEvent.VK_QUOTE:
      case KeyEvent.VK_KP_UP:
      case KeyEvent.VK_KP_DOWN:
      case KeyEvent.VK_KP_LEFT:
      case KeyEvent.VK_KP_RIGHT:
      case KeyEvent.VK_DEAD_GRAVE:
      case KeyEvent.VK_DEAD_ACUTE:
      case KeyEvent.VK_DEAD_CIRCUMFLEX:
      case KeyEvent.VK_DEAD_TILDE:
      case KeyEvent.VK_DEAD_MACRON:
      case KeyEvent.VK_DEAD_BREVE:
      case KeyEvent.VK_DEAD_ABOVEDOT:
      case KeyEvent.VK_DEAD_DIAERESIS:
      case KeyEvent.VK_DEAD_ABOVERING:
      case KeyEvent.VK_DEAD_DOUBLEACUTE:
      case KeyEvent.VK_DEAD_CARON:
      case KeyEvent.VK_DEAD_CEDILLA:
      case KeyEvent.VK_DEAD_OGONEK:
      case KeyEvent.VK_DEAD_IOTA:
      case KeyEvent.VK_DEAD_VOICED_SOUND:
      case KeyEvent.VK_DEAD_SEMIVOICED_SOUND:
      case KeyEvent.VK_AMPERSAND:
      case KeyEvent.VK_ASTERISK:
      case KeyEvent.VK_QUOTEDBL:
      case KeyEvent.VK_LESS:
      case KeyEvent.VK_GREATER:
      case KeyEvent.VK_BRACELEFT:
      case KeyEvent.VK_BRACERIGHT:
      case KeyEvent.VK_AT:
      case KeyEvent.VK_COLON:
      case KeyEvent.VK_CIRCUMFLEX:
      case KeyEvent.VK_DOLLAR:
      case KeyEvent.VK_EURO_SIGN:
      case KeyEvent.VK_EXCLAMATION_MARK:
      case KeyEvent.VK_INVERTED_EXCLAMATION_MARK:
      case KeyEvent.VK_LEFT_PARENTHESIS:
      case KeyEvent.VK_NUMBER_SIGN:
      case KeyEvent.VK_PLUS:
      case KeyEvent.VK_RIGHT_PARENTHESIS:
      case KeyEvent.VK_UNDERSCORE:
      case KeyEvent.VK_FINAL:
      case KeyEvent.VK_CONVERT:
      case KeyEvent.VK_NONCONVERT:
      case KeyEvent.VK_ACCEPT:
      case KeyEvent.VK_MODECHANGE:
      case KeyEvent.VK_KANA:
      case KeyEvent.VK_KANJI:
      case KeyEvent.VK_ALPHANUMERIC:
      case KeyEvent.VK_KATAKANA:
      case KeyEvent.VK_HIRAGANA:
      case KeyEvent.VK_FULL_WIDTH:
      case KeyEvent.VK_HALF_WIDTH:
      case KeyEvent.VK_ROMAN_CHARACTERS:
      case KeyEvent.VK_ALL_CANDIDATES:
      case KeyEvent.VK_PREVIOUS_CANDIDATE:
      case KeyEvent.VK_CODE_INPUT:
      case KeyEvent.VK_JAPANESE_KATAKANA:
      case KeyEvent.VK_JAPANESE_HIRAGANA:
      case KeyEvent.VK_JAPANESE_ROMAN:
      case KeyEvent.VK_KANA_LOCK:
      case KeyEvent.VK_INPUT_METHOD_ON_OFF:
      case KeyEvent.VK_CUT:
      case KeyEvent.VK_COPY:
      case KeyEvent.VK_PASTE:
      case KeyEvent.VK_UNDO:
      case KeyEvent.VK_AGAIN:
      case KeyEvent.VK_FIND:
      case KeyEvent.VK_PROPS:
      case KeyEvent.VK_STOP:
      case KeyEvent.VK_COMPOSE:
      case KeyEvent.VK_ALT_GRAPH:
      case KeyEvent.VK_BEGIN:
      case KeyEvent.VK_CONTEXT_MENU:
      case KeyEvent.VK_WINDOWS:
        return true;
      default:
        return false;
      }
  }
}