Source for javax.swing.plaf.basic.BasicMenuUI

   1: /* BasicMenuUI.java
   2:    Copyright (C) 2002, 2004, 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package javax.swing.plaf.basic;
  40: 
  41: import gnu.classpath.NotImplementedException;
  42: 
  43: import java.awt.Component;
  44: import java.awt.Container;
  45: import java.awt.Dimension;
  46: import java.awt.Point;
  47: import java.awt.event.ActionEvent;
  48: import java.awt.event.MouseEvent;
  49: import java.beans.PropertyChangeListener;
  50: 
  51: import javax.swing.AbstractAction;
  52: import javax.swing.JComponent;
  53: import javax.swing.JMenu;
  54: import javax.swing.JMenuBar;
  55: import javax.swing.JPopupMenu;
  56: import javax.swing.LookAndFeel;
  57: import javax.swing.MenuElement;
  58: import javax.swing.MenuSelectionManager;
  59: import javax.swing.Timer;
  60: import javax.swing.UIDefaults;
  61: import javax.swing.UIManager;
  62: import javax.swing.event.ChangeEvent;
  63: import javax.swing.event.ChangeListener;
  64: import javax.swing.event.MenuDragMouseEvent;
  65: import javax.swing.event.MenuDragMouseListener;
  66: import javax.swing.event.MenuEvent;
  67: import javax.swing.event.MenuKeyEvent;
  68: import javax.swing.event.MenuKeyListener;
  69: import javax.swing.event.MenuListener;
  70: import javax.swing.event.MouseInputListener;
  71: import javax.swing.plaf.ComponentUI;
  72: 
  73: /**
  74:  * UI Delegate for JMenu
  75:  */
  76: public class BasicMenuUI extends BasicMenuItemUI
  77: {
  78:   /**
  79:    * Selects a menu. This is used to delay menu selection.
  80:    */
  81:   class SelectMenuAction
  82:     extends AbstractAction
  83:   {
  84:     /**
  85:      * Performs the action.
  86:      */
  87:     public void actionPerformed(ActionEvent event)
  88:     {
  89:       JMenu menu = (JMenu) menuItem;
  90:       MenuSelectionManager defaultManager =
  91:         MenuSelectionManager.defaultManager();
  92:       MenuElement path[] = defaultManager.getSelectedPath();
  93:       if(path.length > 0 && path[path.length - 1] == menu)
  94:         {
  95:           MenuElement newPath[] = new MenuElement[path.length + 1];
  96:           System.arraycopy(path, 0, newPath, 0, path.length);
  97:           newPath[path.length] = menu.getPopupMenu();
  98:           defaultManager.setSelectedPath(newPath);
  99:       }
 100:     }
 101: 
 102:   }
 103: 
 104:   protected ChangeListener changeListener;
 105: 
 106:   /* MenuListener listens to MenuEvents fired by JMenu */
 107:   protected MenuListener menuListener;
 108: 
 109:   /* PropertyChangeListner that listens to propertyChangeEvents occuring in JMenu*/
 110:   protected PropertyChangeListener propertyChangeListener;
 111: 
 112:   /**
 113:    * Creates a new BasicMenuUI object.
 114:    */
 115:   public BasicMenuUI()
 116:   {
 117:     mouseInputListener = createMouseInputListener((JMenu) menuItem);
 118:     menuListener = createMenuListener((JMenu) menuItem);
 119:     propertyChangeListener = createPropertyChangeListener((JMenu) menuItem);
 120:   }
 121: 
 122:   /**
 123:    * This method creates a new ChangeListener.
 124:    *
 125:    * @return A new ChangeListener.
 126:    */
 127:   protected ChangeListener createChangeListener(JComponent c)
 128:   {
 129:     return new ChangeHandler((JMenu) c, this);
 130:   }
 131: 
 132:   /**
 133:    * This method creates new MenuDragMouseListener to listen to mouse dragged events
 134:    * occuring in the Menu
 135:    *
 136:    * @param c the menu to listen to
 137:    *
 138:    * @return The MenuDrageMouseListener
 139:    */
 140:   protected MenuDragMouseListener createMenuDragMouseListener(JComponent c)
 141:   {
 142:     return new MenuDragMouseHandler();
 143:   }
 144: 
 145:   /**
 146:    * This method creates new MenuDragKeyListener to listen to key events
 147:    *
 148:    * @param c the menu to listen to
 149:    *
 150:    * @return The MenuKeyListener
 151:    */
 152:   protected MenuKeyListener createMenuKeyListener(JComponent c)
 153:   {
 154:     return new MenuKeyHandler();
 155:   }
 156: 
 157:   /**
 158:    * This method creates new MenuListener to listen to menu events
 159:    * occuring in the Menu
 160:    *
 161:    * @param c the menu to listen to
 162:    *
 163:    * @return The MenuListener
 164:    */
 165:   protected MenuListener createMenuListener(JComponent c)
 166:   {
 167:     return new MenuHandler();
 168:   }
 169: 
 170:   /**
 171:    * This method creates new MouseInputListener to listen to mouse input events
 172:    * occuring in the Menu
 173:    *
 174:    * @param c the menu to listen to
 175:    *
 176:    * @return The MouseInputListener
 177:    */
 178:   protected MouseInputListener createMouseInputListener(JComponent c)
 179:   {
 180:     return new MouseInputHandler();
 181:   }
 182: 
 183:   /**
 184:    * This method creates newPropertyChangeListener to listen to property changes
 185:    * occuring in the Menu
 186:    *
 187:    * @param c the menu to listen to
 188:    *
 189:    * @return The PropertyChangeListener
 190:    */
 191:   protected PropertyChangeListener createPropertyChangeListener(JComponent c)
 192:   {
 193:     return new PropertyChangeHandler();
 194:   }
 195: 
 196:   /**
 197:    * This method creates a new BasicMenuUI.
 198:    *
 199:    * @param c The JComponent to create a UI for.
 200:    *
 201:    * @return A new BasicMenuUI.
 202:    */
 203:   public static ComponentUI createUI(JComponent c)
 204:   {
 205:     return new BasicMenuUI();
 206:   }
 207: 
 208:   /**
 209:    * Get the component's maximum size.
 210:    *
 211:    * @param c The JComponent for which to get maximum size
 212:    *
 213:    * @return The maximum size of the component
 214:    */
 215:   public Dimension getMaximumSize(JComponent c)
 216:   {
 217:     return c.getPreferredSize();
 218:   }
 219: 
 220:   /**
 221:    * Returns the prefix for entries in the {@link UIDefaults} table.
 222:    *
 223:    * @return "Menu"
 224:    */
 225:   protected String getPropertyPrefix()
 226:   {
 227:     return "Menu";
 228:   }
 229: 
 230:   /**
 231:    * Initializes any default properties that this UI has from the defaults for
 232:    * the Basic look and feel.
 233:    */
 234:   protected void installDefaults()
 235:   {
 236: 
 237:     LookAndFeel.installBorder(menuItem, "Menu.border");
 238:     LookAndFeel.installColorsAndFont(menuItem, "Menu.background",
 239:                                      "Menu.foreground", "Menu.font");
 240:     menuItem.setMargin(UIManager.getInsets("Menu.margin"));
 241:     acceleratorFont = UIManager.getFont("Menu.acceleratorFont");
 242:     acceleratorForeground = UIManager.getColor("Menu.acceleratorForeground");
 243:     acceleratorSelectionForeground = UIManager.getColor("Menu.acceleratorSelectionForeground");
 244:     selectionBackground = UIManager.getColor("Menu.selectionBackground");
 245:     selectionForeground = UIManager.getColor("Menu.selectionForeground");
 246:     arrowIcon = UIManager.getIcon("Menu.arrowIcon");
 247:     oldBorderPainted = UIManager.getBoolean("Menu.borderPainted");
 248:     ((JMenu) menuItem).setDelay(200);
 249:   }
 250: 
 251:   /**
 252:    * Installs any keyboard actions. The list of keys that need to be bound are
 253:    * listed in Basic look and feel's defaults.
 254:    *
 255:    */
 256:   protected void installKeyboardActions()
 257:   {
 258:     super.installKeyboardActions();
 259:   }
 260: 
 261:   /**
 262:    * Creates and registers all the listeners for this UI delegate.
 263:    */
 264:   protected void installListeners()
 265:   {
 266:     super.installListeners();
 267:     ((JMenu) menuItem).addMenuListener(menuListener);
 268:   }
 269: 
 270:   protected void setupPostTimer(JMenu menu)
 271:   {
 272:     Timer timer = new Timer(menu.getDelay(), new SelectMenuAction());
 273:     timer.setRepeats(false);
 274:     timer.start();
 275:   }
 276: 
 277:   /**
 278:    * This method uninstalls the defaults and sets any objects created during
 279:    * install to null
 280:    */
 281:   protected void uninstallDefaults()
 282:   {
 283:     menuItem.setBackground(null);
 284:     menuItem.setBorder(null);
 285:     menuItem.setFont(null);
 286:     menuItem.setForeground(null);
 287:     menuItem.setMargin(null);
 288:     acceleratorFont = null;
 289:     acceleratorForeground = null;
 290:     acceleratorSelectionForeground = null;
 291:     selectionBackground = null;
 292:     selectionForeground = null;
 293:     arrowIcon = null;
 294:   }
 295: 
 296:   /**
 297:    * Uninstalls any keyboard actions. The list of keys used  are listed in
 298:    * Basic look and feel's defaults.
 299:    */
 300:   protected void uninstallKeyboardActions()
 301:   {
 302:     super.installKeyboardActions();
 303:   }
 304: 
 305:   /**
 306:    * Unregisters all the listeners that this UI delegate was using. In
 307:    * addition, it will also null any listeners that it was using.
 308:    */
 309:   protected void uninstallListeners()
 310:   {
 311:     super.uninstallListeners();
 312:     ((JMenu) menuItem).removeMenuListener(menuListener);
 313:   }
 314: 
 315:   /**
 316:    * This class is used by menus to handle mouse events occuring in the
 317:    * menu.
 318:    */
 319:   protected class MouseInputHandler implements MouseInputListener
 320:   {
 321:     public void mouseClicked(MouseEvent e)
 322:     {
 323:       // Nothing to do here.
 324:     }
 325: 
 326:     public void mouseDragged(MouseEvent e)
 327:     {
 328:       MenuSelectionManager manager = MenuSelectionManager.defaultManager();
 329:       manager.processMouseEvent(e);
 330:     }
 331: 
 332:     private boolean popupVisible()
 333:     {
 334:       JMenuBar mb = (JMenuBar) ((JMenu) menuItem).getParent();
 335:       // check if mb.isSelected because if no menus are selected
 336:       // we don't have to look through the list for popup menus
 337:       if (!mb.isSelected())
 338:         return false;
 339:       for (int i = 0; i < mb.getMenuCount(); i++)
 340:       {
 341:          JMenu m = mb.getMenu(i);
 342:         if (m != null && m.isPopupMenuVisible())
 343:           return true;
 344:       }
 345:       return false;
 346:     }
 347: 
 348:     public void mouseEntered(MouseEvent e)
 349:     {
 350:       JMenu menu = (JMenu) menuItem;
 351:       if (menu.isEnabled())
 352:         {
 353:           MenuSelectionManager manager =
 354:             MenuSelectionManager.defaultManager();
 355:           MenuElement[] selectedPath = manager.getSelectedPath();
 356:           if (! menu.isTopLevelMenu())
 357:             {
 358:               // Open the menu immediately or delayed, depending on the
 359:               // delay value.
 360:               if(! (selectedPath.length > 0
 361:                   && selectedPath[selectedPath.length - 1] == menu.getPopupMenu()))
 362:                 {
 363:                   if(menu.getDelay() == 0)
 364:                     {
 365:                       MenuElement[] path = getPath();
 366:                       MenuElement[] newPath = new MenuElement[path.length + 1];
 367:                       System.arraycopy(path, 0, newPath, 0, path.length);
 368:                       newPath[path.length] = menu.getPopupMenu();
 369:                       manager.setSelectedPath(newPath);
 370:                     }
 371:                   else
 372:                     {
 373:                       manager.setSelectedPath(getPath());
 374:                       setupPostTimer(menu);
 375:                     }
 376:                 }
 377:             }
 378:           else
 379:             {
 380:               if(selectedPath.length > 0
 381:                   && selectedPath[0] == menu.getParent())
 382:                 {
 383:                   MenuElement[] newPath = new MenuElement[3];
 384:                   newPath[0] = (MenuElement) menu.getParent();
 385:                   newPath[1] = menu;
 386:                   newPath[2] = menu.getPopupMenu();
 387:                   manager.setSelectedPath(newPath);
 388:                 }
 389:             }
 390:         }
 391:     }
 392: 
 393:     public void mouseExited(MouseEvent e)
 394:     {
 395:       MenuSelectionManager manager = MenuSelectionManager.defaultManager();
 396:       manager.processMouseEvent(e);
 397:     }
 398: 
 399:     public void mouseMoved(MouseEvent e)
 400:     {
 401:       // Nothing to do here.
 402:     }
 403: 
 404:     public void mousePressed(MouseEvent e)
 405:     {
 406:       MenuSelectionManager manager = MenuSelectionManager.defaultManager();
 407:       JMenu menu = (JMenu) menuItem;
 408:       if (menu.isEnabled())
 409:         {
 410:           // Open up the menu immediately if it's a toplevel menu.
 411:           // But not yet the popup, which might be opened delayed, see below.
 412:           if (menu.isTopLevelMenu())
 413:             {
 414:               if (menu.isSelected())
 415:                 manager.clearSelectedPath();
 416:               else
 417:                 {
 418:                   Container cnt = menu.getParent();
 419:                   if (cnt != null && cnt instanceof JMenuBar)
 420:                     {
 421:                       MenuElement[] me = new MenuElement[2];
 422:                       me[0] = (MenuElement) cnt;
 423:                       me[1] = menu;
 424:                       manager.setSelectedPath(me);
 425:                    }
 426:                 }
 427:             }
 428: 
 429:           // Open the menu's popup. Either do that immediately if delay == 0,
 430:           // or delayed when delay > 0.
 431:           MenuElement[] selectedPath = manager.getSelectedPath();
 432:           if (selectedPath.length > 0
 433:               && selectedPath[selectedPath.length - 1] != menu.getPopupMenu())
 434:             {
 435:               if(menu.isTopLevelMenu() || menu.getDelay() == 0)
 436:                 {
 437:                   MenuElement[] newPath =
 438:                     new MenuElement[selectedPath.length + 1];
 439:                   System.arraycopy(selectedPath, 0, newPath, 0,
 440:                                    selectedPath.length);
 441:                   newPath[selectedPath.length] = menu.getPopupMenu();
 442:                   manager.setSelectedPath(newPath);
 443:                 }
 444:               else
 445:                 {
 446:                   setupPostTimer(menu);
 447:                 }
 448:             }
 449: 
 450:         }
 451:     }
 452: 
 453:     public void mouseReleased(MouseEvent e)
 454:     {
 455:       MenuSelectionManager manager = MenuSelectionManager.defaultManager();
 456:       manager.processMouseEvent(e);
 457:     }
 458:   }
 459: 
 460:   /**
 461:    * This class handles MenuEvents fired by the JMenu
 462:    */
 463:   private class MenuHandler implements MenuListener
 464:   {
 465:     /**
 466:      * This method is called when menu is cancelled. The menu is cancelled
 467:      * when its popup menu is closed without selection. It clears selected index
 468:      * in the selectionModel of the menu parent.
 469:      *
 470:      * @param e The MenuEvent.
 471:      */
 472:     public void menuCanceled(MenuEvent e)
 473:     {
 474:       menuDeselected(e);
 475:     }
 476: 
 477:     /**
 478:      * This method is called when menu is deselected. It clears selected index
 479:      * in the selectionModel of the menu parent.
 480:      *
 481:      * @param e The MenuEvent.
 482:      */
 483:     public void menuDeselected(MenuEvent e)
 484:     {
 485:       JMenu menu = (JMenu) menuItem;
 486:       if (menu.getParent() != null)
 487:         {
 488:           if (menu.isTopLevelMenu())
 489:             ((JMenuBar) menu.getParent()).getSelectionModel().clearSelection();
 490:           else
 491:             ((JPopupMenu) menu.getParent()).getSelectionModel().clearSelection();
 492:         }
 493:     }
 494: 
 495:     /**
 496:      * This method is called when menu is selected.  It sets selected index
 497:      * in the selectionModel of the menu parent.
 498:      *
 499:      * @param e The MenuEvent.
 500:      */
 501:     public void menuSelected(MenuEvent e)
 502:     {
 503:       JMenu menu = (JMenu) menuItem;
 504:       if (menu.isTopLevelMenu())
 505:         ((JMenuBar) menu.getParent()).setSelected(menu);
 506:       else
 507:         ((JPopupMenu) menu.getParent()).setSelected(menu);
 508:     }
 509:   }
 510: 
 511:   /**
 512:    * Obsolete as of JDK1.4.
 513:    */
 514:   public class ChangeHandler implements ChangeListener
 515:   {
 516:     /**
 517:      * Not used.
 518:      */
 519:     public boolean isSelected;
 520: 
 521:     /**
 522:      * Not used.
 523:      */
 524:     public JMenu menu;
 525: 
 526:     /**
 527:      * Not used.
 528:      */
 529:     public BasicMenuUI ui;
 530: 
 531:     /**
 532:      * Not used.
 533:      */
 534:     public Component wasFocused;
 535: 
 536:     /**
 537:      * Not used.
 538:      */
 539:     public ChangeHandler(JMenu m, BasicMenuUI ui)
 540:     {
 541:       menu = m;
 542:       this.ui = ui;
 543:     }
 544: 
 545:     /**
 546:      * Not used.
 547:      */
 548:     public void stateChanged(ChangeEvent e)
 549:     {
 550:       // Not used.
 551:     }
 552:   }
 553: 
 554:   /**
 555:    * This class handles mouse dragged events occuring in the menu.
 556:    */
 557:   private class MenuDragMouseHandler implements MenuDragMouseListener
 558:   {
 559:     /**
 560:      * This method is invoked when mouse is dragged over the menu item.
 561:      *
 562:      * @param e The MenuDragMouseEvent
 563:      */
 564:     public void menuDragMouseDragged(MenuDragMouseEvent e)
 565:     {
 566:       if (menuItem.isEnabled())
 567:         {
 568:           MenuSelectionManager manager = e.getMenuSelectionManager();
 569:           MenuElement path[] = e.getPath();
 570: 
 571:           Point p = e.getPoint();
 572:           if(p.x >= 0 && p.x < menuItem.getWidth()
 573:               && p.y >= 0 && p.y < menuItem.getHeight())
 574:             {
 575:               JMenu menu = (JMenu) menuItem;
 576:               MenuElement[] selectedPath = manager.getSelectedPath();
 577:               if(! (selectedPath.length > 0
 578:                   && selectedPath[selectedPath.length-1]
 579:                                   == menu.getPopupMenu()))
 580:                 {
 581:                   if(menu.isTopLevelMenu() || menu.getDelay() == 0
 582:                      || e.getID() == MouseEvent.MOUSE_DRAGGED)
 583:                     {
 584:                       MenuElement[] newPath = new MenuElement[path.length + 1];
 585:                       System.arraycopy(path, 0, newPath, 0, path.length);
 586:                       newPath[path.length] = menu.getPopupMenu();
 587:                       manager.setSelectedPath(newPath);
 588:                     }
 589:                   else
 590:                     {
 591:                       manager.setSelectedPath(path);
 592:                       setupPostTimer(menu);
 593:                     }
 594:                 }
 595:             }
 596:           else if (e.getID() == MouseEvent.MOUSE_RELEASED)
 597:             {
 598:               Component comp = manager.componentForPoint(e.getComponent(),
 599:                                                          e.getPoint());
 600:               if (comp == null)
 601:                 manager.clearSelectedPath();
 602:             }
 603:         }
 604:     }
 605: 
 606:     /**
 607:      * This method is invoked when mouse enters the menu item while it is
 608:      * being dragged.
 609:      *
 610:      * @param e The MenuDragMouseEvent
 611:      */
 612:     public void menuDragMouseEntered(MenuDragMouseEvent e)
 613:     {
 614:       // Nothing to do here.
 615:     }
 616: 
 617:     /**
 618:      * This method is invoked when mouse exits the menu item while
 619:      * it is being dragged
 620:      *
 621:      * @param e The MenuDragMouseEvent
 622:      */
 623:     public void menuDragMouseExited(MenuDragMouseEvent e)
 624:     {
 625:       // Nothing to do here.
 626:     }
 627: 
 628:     /**
 629:      * This method is invoked when mouse was dragged and released
 630:      * inside the menu item.
 631:      *
 632:      * @param e The MenuDragMouseEvent
 633:      */
 634:     public void menuDragMouseReleased(MenuDragMouseEvent e)
 635:     {
 636:       // Nothing to do here.
 637:     }
 638:   }
 639: 
 640:   /**
 641:    * This class handles key events occuring when menu item is visible on the
 642:    * screen.
 643:    */
 644:   private class MenuKeyHandler implements MenuKeyListener
 645:   {
 646:     /**
 647:      * This method is invoked when key has been pressed
 648:      *
 649:      * @param e A {@link MenuKeyEvent}.
 650:      */
 651:     public void menuKeyPressed(MenuKeyEvent e)
 652:     {
 653:       // Nothing to do here.
 654:     }
 655: 
 656:     /**
 657:      * This method is invoked when key has been pressed
 658:      *
 659:      * @param e A {@link MenuKeyEvent}.
 660:      */
 661:     public void menuKeyReleased(MenuKeyEvent e)
 662:     {
 663:       // Nothing to do here.
 664:     }
 665: 
 666:     /**
 667:      * This method is invoked when key has been typed
 668:      * It handles the mnemonic key for the menu item.
 669:      *
 670:      * @param e A {@link MenuKeyEvent}.
 671:      */
 672:     public void menuKeyTyped(MenuKeyEvent e)
 673:     throws NotImplementedException
 674:     {
 675:       // TODO: What should be done here, if anything?
 676:     }
 677:   }
 678: }