J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package javax.swing; |
| 26 | |
| 27 | import java.util.EventListener; |
| 28 | import java.awt.*; |
| 29 | import java.awt.event.*; |
| 30 | import java.awt.image.*; |
| 31 | |
| 32 | import java.beans.PropertyChangeEvent; |
| 33 | import java.beans.PropertyChangeListener; |
| 34 | |
| 35 | import java.io.Serializable; |
| 36 | import java.io.ObjectOutputStream; |
| 37 | import java.io.ObjectInputStream; |
| 38 | import java.io.IOException; |
| 39 | |
| 40 | import javax.swing.plaf.*; |
| 41 | import javax.swing.plaf.basic.*; |
| 42 | import javax.swing.event.*; |
| 43 | import javax.accessibility.*; |
| 44 | |
| 45 | /** |
| 46 | * An implementation of an item in a menu. A menu item is essentially a button |
| 47 | * sitting in a list. When the user selects the "button", the action |
| 48 | * associated with the menu item is performed. A <code>JMenuItem</code> |
| 49 | * contained in a <code>JPopupMenu</code> performs exactly that function. |
| 50 | * <p> |
| 51 | * Menu items can be configured, and to some degree controlled, by |
| 52 | * <code><a href="Action.html">Action</a></code>s. Using an |
| 53 | * <code>Action</code> with a menu item has many benefits beyond directly |
| 54 | * configuring a menu item. Refer to <a href="Action.html#buttonActions"> |
| 55 | * Swing Components Supporting <code>Action</code></a> for more |
| 56 | * details, and you can find more information in <a |
| 57 | * href="http://java.sun.com/docs/books/tutorial/uiswing/misc/action.html">How |
| 58 | * to Use Actions</a>, a section in <em>The Java Tutorial</em>. |
| 59 | * <p> |
| 60 | * For further documentation and for examples, see |
| 61 | * <a |
| 62 | href="http://java.sun.com/docs/books/tutorial/uiswing/components/menu.html">How to Use Menus</a> |
| 63 | * in <em>The Java Tutorial.</em> |
| 64 | * <p> |
| 65 | * <strong>Warning:</strong> Swing is not thread safe. For more |
| 66 | * information see <a |
| 67 | * href="package-summary.html#threading">Swing's Threading |
| 68 | * Policy</a>. |
| 69 | * <p> |
| 70 | * <strong>Warning:</strong> |
| 71 | * Serialized objects of this class will not be compatible with |
| 72 | * future Swing releases. The current serialization support is |
| 73 | * appropriate for short term storage or RMI between applications running |
| 74 | * the same version of Swing. As of 1.4, support for long term storage |
| 75 | * of all JavaBeans<sup><font size="-2">TM</font></sup> |
| 76 | * has been added to the <code>java.beans</code> package. |
| 77 | * Please see {@link java.beans.XMLEncoder}. |
| 78 | * |
| 79 | * @beaninfo |
| 80 | * attribute: isContainer false |
| 81 | * description: An item which can be selected in a menu. |
| 82 | * |
| 83 | * @author Georges Saab |
| 84 | * @author David Karlton |
| 85 | * @see JPopupMenu |
| 86 | * @see JMenu |
| 87 | * @see JCheckBoxMenuItem |
| 88 | * @see JRadioButtonMenuItem |
| 89 | */ |
| 90 | public class JMenuItem extends AbstractButton implements Accessible,MenuElement { |
| 91 | |
| 92 | /** |
| 93 | * @see #getUIClassID |
| 94 | * @see #readObject |
| 95 | */ |
| 96 | private static final String uiClassID = "MenuItemUI"; |
| 97 | |
| 98 | /* diagnostic aids -- should be false for production builds. */ |
| 99 | private static final boolean TRACE = false; // trace creates and disposes |
| 100 | private static final boolean VERBOSE = false; // show reuse hits/misses |
| 101 | private static final boolean DEBUG = false; // show bad params, misc. |
| 102 | |
| 103 | private boolean isMouseDragged = false; |
| 104 | |
| 105 | /** |
| 106 | * Creates a <code>JMenuItem</code> with no set text or icon. |
| 107 | */ |
| 108 | public JMenuItem() { |
| 109 | this(null, (Icon)null); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Creates a <code>JMenuItem</code> with the specified icon. |
| 114 | * |
| 115 | * @param icon the icon of the <code>JMenuItem</code> |
| 116 | */ |
| 117 | public JMenuItem(Icon icon) { |
| 118 | this(null, icon); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Creates a <code>JMenuItem</code> with the specified text. |
| 123 | * |
| 124 | * @param text the text of the <code>JMenuItem</code> |
| 125 | */ |
| 126 | public JMenuItem(String text) { |
| 127 | this(text, (Icon)null); |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Creates a menu item whose properties are taken from the |
| 132 | * specified <code>Action</code>. |
| 133 | * |
| 134 | * @param a the action of the <code>JMenuItem</code> |
| 135 | * @since 1.3 |
| 136 | */ |
| 137 | public JMenuItem(Action a) { |
| 138 | this(); |
| 139 | setAction(a); |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Creates a <code>JMenuItem</code> with the specified text and icon. |
| 144 | * |
| 145 | * @param text the text of the <code>JMenuItem</code> |
| 146 | * @param icon the icon of the <code>JMenuItem</code> |
| 147 | */ |
| 148 | public JMenuItem(String text, Icon icon) { |
| 149 | setModel(new DefaultButtonModel()); |
| 150 | init(text, icon); |
| 151 | initFocusability(); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Creates a <code>JMenuItem</code> with the specified text and |
| 156 | * keyboard mnemonic. |
| 157 | * |
| 158 | * @param text the text of the <code>JMenuItem</code> |
| 159 | * @param mnemonic the keyboard mnemonic for the <code>JMenuItem</code> |
| 160 | */ |
| 161 | public JMenuItem(String text, int mnemonic) { |
| 162 | setModel(new DefaultButtonModel()); |
| 163 | init(text, null); |
| 164 | setMnemonic(mnemonic); |
| 165 | initFocusability(); |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * {@inheritDoc} |
| 170 | */ |
| 171 | public void setModel(ButtonModel newModel) { |
| 172 | super.setModel(newModel); |
| 173 | if(newModel instanceof DefaultButtonModel) { |
| 174 | ((DefaultButtonModel)newModel).setMenuItem(true); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Inititalizes the focusability of the the <code>JMenuItem</code>. |
| 180 | * <code>JMenuItem</code>'s are focusable, but subclasses may |
| 181 | * want to be, this provides them the opportunity to override this |
| 182 | * and invoke something else, or nothing at all. Refer to |
| 183 | * {@link javax.swing.JMenu#initFocusability} for the motivation of |
| 184 | * this. |
| 185 | */ |
| 186 | void initFocusability() { |
| 187 | setFocusable(false); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * Initializes the menu item with the specified text and icon. |
| 192 | * |
| 193 | * @param text the text of the <code>JMenuItem</code> |
| 194 | * @param icon the icon of the <code>JMenuItem</code> |
| 195 | */ |
| 196 | protected void init(String text, Icon icon) { |
| 197 | if(text != null) { |
| 198 | setText(text); |
| 199 | } |
| 200 | |
| 201 | if(icon != null) { |
| 202 | setIcon(icon); |
| 203 | } |
| 204 | |
| 205 | // Listen for Focus events |
| 206 | addFocusListener(new MenuItemFocusListener()); |
| 207 | setUIProperty("borderPainted", Boolean.FALSE); |
| 208 | setFocusPainted(false); |
| 209 | setHorizontalTextPosition(JButton.TRAILING); |
| 210 | setHorizontalAlignment(JButton.LEADING); |
| 211 | updateUI(); |
| 212 | } |
| 213 | |
| 214 | private static class MenuItemFocusListener implements FocusListener, |
| 215 | Serializable { |
| 216 | public void focusGained(FocusEvent event) {} |
| 217 | public void focusLost(FocusEvent event) { |
| 218 | // When focus is lost, repaint if |
| 219 | // the focus information is painted |
| 220 | JMenuItem mi = (JMenuItem)event.getSource(); |
| 221 | if(mi.isFocusPainted()) { |
| 222 | mi.repaint(); |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | |
| 228 | /** |
| 229 | * Sets the look and feel object that renders this component. |
| 230 | * |
| 231 | * @param ui the <code>JMenuItemUI</code> L&F object |
| 232 | * @see UIDefaults#getUI |
| 233 | * @beaninfo |
| 234 | * bound: true |
| 235 | * hidden: true |
| 236 | * attribute: visualUpdate true |
| 237 | * description: The UI object that implements the Component's LookAndFeel. |
| 238 | */ |
| 239 | public void setUI(MenuItemUI ui) { |
| 240 | super.setUI(ui); |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * Resets the UI property with a value from the current look and feel. |
| 245 | * |
| 246 | * @see JComponent#updateUI |
| 247 | */ |
| 248 | public void updateUI() { |
| 249 | setUI((MenuItemUI)UIManager.getUI(this)); |
| 250 | } |
| 251 | |
| 252 | |
| 253 | /** |
| 254 | * Returns the suffix used to construct the name of the L&F class used to |
| 255 | * render this component. |
| 256 | * |
| 257 | * @return the string "MenuItemUI" |
| 258 | * @see JComponent#getUIClassID |
| 259 | * @see UIDefaults#getUI |
| 260 | */ |
| 261 | public String getUIClassID() { |
| 262 | return uiClassID; |
| 263 | } |
| 264 | |
| 265 | |
| 266 | /** |
| 267 | * Identifies the menu item as "armed". If the mouse button is |
| 268 | * released while it is over this item, the menu's action event |
| 269 | * will fire. If the mouse button is released elsewhere, the |
| 270 | * event will not fire and the menu item will be disarmed. |
| 271 | * |
| 272 | * @param b true to arm the menu item so it can be selected |
| 273 | * @beaninfo |
| 274 | * description: Mouse release will fire an action event |
| 275 | * hidden: true |
| 276 | */ |
| 277 | public void setArmed(boolean b) { |
| 278 | ButtonModel model = (ButtonModel) getModel(); |
| 279 | |
| 280 | boolean oldValue = model.isArmed(); |
| 281 | if(model.isArmed() != b) { |
| 282 | model.setArmed(b); |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | /** |
| 287 | * Returns whether the menu item is "armed". |
| 288 | * |
| 289 | * @return true if the menu item is armed, and it can be selected |
| 290 | * @see #setArmed |
| 291 | */ |
| 292 | public boolean isArmed() { |
| 293 | ButtonModel model = (ButtonModel) getModel(); |
| 294 | return model.isArmed(); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * Enables or disables the menu item. |
| 299 | * |
| 300 | * @param b true to enable the item |
| 301 | * @beaninfo |
| 302 | * description: Does the component react to user interaction |
| 303 | * bound: true |
| 304 | * preferred: true |
| 305 | */ |
| 306 | public void setEnabled(boolean b) { |
| 307 | // Make sure we aren't armed! |
| 308 | if (!b && !UIManager.getBoolean("MenuItem.disabledAreNavigable")) { |
| 309 | setArmed(false); |
| 310 | } |
| 311 | super.setEnabled(b); |
| 312 | } |
| 313 | |
| 314 | |
| 315 | /** |
| 316 | * Returns true since <code>Menu</code>s, by definition, |
| 317 | * should always be on top of all other windows. If the menu is |
| 318 | * in an internal frame false is returned due to the rollover effect |
| 319 | * for windows laf where the menu is not always on top. |
| 320 | */ |
| 321 | // package private |
| 322 | boolean alwaysOnTop() { |
| 323 | // Fix for bug #4482165 |
| 324 | if (SwingUtilities.getAncestorOfClass(JInternalFrame.class, this) != |
| 325 | null) { |
| 326 | return false; |
| 327 | } |
| 328 | return true; |
| 329 | } |
| 330 | |
| 331 | |
| 332 | /* The keystroke which acts as the menu item's accelerator |
| 333 | */ |
| 334 | private KeyStroke accelerator; |
| 335 | |
| 336 | /** |
| 337 | * Sets the key combination which invokes the menu item's |
| 338 | * action listeners without navigating the menu hierarchy. It is the |
| 339 | * UI's responsibility to install the correct action. Note that |
| 340 | * when the keyboard accelerator is typed, it will work whether or |
| 341 | * not the menu is currently displayed. |
| 342 | * |
| 343 | * @param keyStroke the <code>KeyStroke</code> which will |
| 344 | * serve as an accelerator |
| 345 | * @beaninfo |
| 346 | * description: The keystroke combination which will invoke the |
| 347 | * JMenuItem's actionlisteners without navigating the |
| 348 | * menu hierarchy |
| 349 | * bound: true |
| 350 | * preferred: true |
| 351 | */ |
| 352 | public void setAccelerator(KeyStroke keyStroke) { |
| 353 | KeyStroke oldAccelerator = accelerator; |
| 354 | this.accelerator = keyStroke; |
| 355 | repaint(); |
| 356 | revalidate(); |
| 357 | firePropertyChange("accelerator", oldAccelerator, accelerator); |
| 358 | } |
| 359 | |
| 360 | /** |
| 361 | * Returns the <code>KeyStroke</code> which serves as an accelerator |
| 362 | * for the menu item. |
| 363 | * @return a <code>KeyStroke</code> object identifying the |
| 364 | * accelerator key |
| 365 | */ |
| 366 | public KeyStroke getAccelerator() { |
| 367 | return this.accelerator; |
| 368 | } |
| 369 | |
| 370 | /** |
| 371 | * {@inheritDoc} |
| 372 | * |
| 373 | * @since 1.3 |
| 374 | */ |
| 375 | protected void configurePropertiesFromAction(Action a) { |
| 376 | super.configurePropertiesFromAction(a); |
| 377 | configureAcceleratorFromAction(a); |
| 378 | } |
| 379 | |
| 380 | void setIconFromAction(Action a) { |
| 381 | Icon icon = null; |
| 382 | if (a != null) { |
| 383 | icon = (Icon)a.getValue(Action.SMALL_ICON); |
| 384 | } |
| 385 | setIcon(icon); |
| 386 | } |
| 387 | |
| 388 | void largeIconChanged(Action a) { |
| 389 | } |
| 390 | |
| 391 | void smallIconChanged(Action a) { |
| 392 | setIconFromAction(a); |
| 393 | } |
| 394 | |
| 395 | void configureAcceleratorFromAction(Action a) { |
| 396 | KeyStroke ks = (a==null) ? null : |
| 397 | (KeyStroke)a.getValue(Action.ACCELERATOR_KEY); |
| 398 | setAccelerator(ks); |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * {@inheritDoc} |
| 403 | * @since 1.6 |
| 404 | */ |
| 405 | protected void actionPropertyChanged(Action action, String propertyName) { |
| 406 | if (propertyName == Action.ACCELERATOR_KEY) { |
| 407 | configureAcceleratorFromAction(action); |
| 408 | } |
| 409 | else { |
| 410 | super.actionPropertyChanged(action, propertyName); |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | /** |
| 415 | * Processes a mouse event forwarded from the |
| 416 | * <code>MenuSelectionManager</code> and changes the menu |
| 417 | * selection, if necessary, by using the |
| 418 | * <code>MenuSelectionManager</code>'s API. |
| 419 | * <p> |
| 420 | * Note: you do not have to forward the event to sub-components. |
| 421 | * This is done automatically by the <code>MenuSelectionManager</code>. |
| 422 | * |
| 423 | * @param e a <code>MouseEvent</code> |
| 424 | * @param path the <code>MenuElement</code> path array |
| 425 | * @param manager the <code>MenuSelectionManager</code> |
| 426 | */ |
| 427 | public void processMouseEvent(MouseEvent e,MenuElement path[],MenuSelectionManager manager) { |
| 428 | processMenuDragMouseEvent( |
| 429 | new MenuDragMouseEvent(e.getComponent(), e.getID(), |
| 430 | e.getWhen(), |
| 431 | e.getModifiers(), e.getX(), e.getY(), |
| 432 | e.getXOnScreen(), e.getYOnScreen(), |
| 433 | e.getClickCount(), e.isPopupTrigger(), |
| 434 | path, manager)); |
| 435 | } |
| 436 | |
| 437 | |
| 438 | /** |
| 439 | * Processes a key event forwarded from the |
| 440 | * <code>MenuSelectionManager</code> and changes the menu selection, |
| 441 | * if necessary, by using <code>MenuSelectionManager</code>'s API. |
| 442 | * <p> |
| 443 | * Note: you do not have to forward the event to sub-components. |
| 444 | * This is done automatically by the <code>MenuSelectionManager</code>. |
| 445 | * |
| 446 | * @param e a <code>KeyEvent</code> |
| 447 | * @param path the <code>MenuElement</code> path array |
| 448 | * @param manager the <code>MenuSelectionManager</code> |
| 449 | */ |
| 450 | public void processKeyEvent(KeyEvent e,MenuElement path[],MenuSelectionManager manager) { |
| 451 | if (DEBUG) { |
| 452 | System.out.println("in JMenuItem.processKeyEvent/3 for " + getText() + |
| 453 | " " + KeyStroke.getKeyStrokeForEvent(e)); |
| 454 | } |
| 455 | MenuKeyEvent mke = new MenuKeyEvent(e.getComponent(), e.getID(), |
| 456 | e.getWhen(), e.getModifiers(), |
| 457 | e.getKeyCode(), e.getKeyChar(), |
| 458 | path, manager); |
| 459 | processMenuKeyEvent(mke); |
| 460 | |
| 461 | if (mke.isConsumed()) { |
| 462 | e.consume(); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | |
| 467 | |
| 468 | /** |
| 469 | * Handles mouse drag in a menu. |
| 470 | * |
| 471 | * @param e a <code>MenuDragMouseEvent</code> object |
| 472 | */ |
| 473 | public void processMenuDragMouseEvent(MenuDragMouseEvent e) { |
| 474 | switch (e.getID()) { |
| 475 | case MouseEvent.MOUSE_ENTERED: |
| 476 | isMouseDragged = false; fireMenuDragMouseEntered(e); break; |
| 477 | case MouseEvent.MOUSE_EXITED: |
| 478 | isMouseDragged = false; fireMenuDragMouseExited(e); break; |
| 479 | case MouseEvent.MOUSE_DRAGGED: |
| 480 | isMouseDragged = true; fireMenuDragMouseDragged(e); break; |
| 481 | case MouseEvent.MOUSE_RELEASED: |
| 482 | if(isMouseDragged) fireMenuDragMouseReleased(e); break; |
| 483 | default: |
| 484 | break; |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | /** |
| 489 | * Handles a keystroke in a menu. |
| 490 | * |
| 491 | * @param e a <code>MenuKeyEvent</code> object |
| 492 | */ |
| 493 | public void processMenuKeyEvent(MenuKeyEvent e) { |
| 494 | if (DEBUG) { |
| 495 | System.out.println("in JMenuItem.processMenuKeyEvent for " + getText()+ |
| 496 | " " + KeyStroke.getKeyStrokeForEvent(e)); |
| 497 | } |
| 498 | switch (e.getID()) { |
| 499 | case KeyEvent.KEY_PRESSED: |
| 500 | fireMenuKeyPressed(e); break; |
| 501 | case KeyEvent.KEY_RELEASED: |
| 502 | fireMenuKeyReleased(e); break; |
| 503 | case KeyEvent.KEY_TYPED: |
| 504 | fireMenuKeyTyped(e); break; |
| 505 | default: |
| 506 | break; |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * Notifies all listeners that have registered interest for |
| 512 | * notification on this event type. |
| 513 | * |
| 514 | * @param event a <code>MenuMouseDragEvent</code> |
| 515 | * @see EventListenerList |
| 516 | */ |
| 517 | protected void fireMenuDragMouseEntered(MenuDragMouseEvent event) { |
| 518 | // Guaranteed to return a non-null array |
| 519 | Object[] listeners = listenerList.getListenerList(); |
| 520 | // Process the listeners last to first, notifying |
| 521 | // those that are interested in this event |
| 522 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 523 | if (listeners[i]==MenuDragMouseListener.class) { |
| 524 | // Lazily create the event: |
| 525 | ((MenuDragMouseListener)listeners[i+1]).menuDragMouseEntered(event); |
| 526 | } |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | /** |
| 531 | * Notifies all listeners that have registered interest for |
| 532 | * notification on this event type. |
| 533 | * |
| 534 | * @param event a <code>MenuDragMouseEvent</code> |
| 535 | * @see EventListenerList |
| 536 | */ |
| 537 | protected void fireMenuDragMouseExited(MenuDragMouseEvent event) { |
| 538 | // Guaranteed to return a non-null array |
| 539 | Object[] listeners = listenerList.getListenerList(); |
| 540 | // Process the listeners last to first, notifying |
| 541 | // those that are interested in this event |
| 542 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 543 | if (listeners[i]==MenuDragMouseListener.class) { |
| 544 | // Lazily create the event: |
| 545 | ((MenuDragMouseListener)listeners[i+1]).menuDragMouseExited(event); |
| 546 | } |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | /** |
| 551 | * Notifies all listeners that have registered interest for |
| 552 | * notification on this event type. |
| 553 | * |
| 554 | * @param event a <code>MenuDragMouseEvent</code> |
| 555 | * @see EventListenerList |
| 556 | */ |
| 557 | protected void fireMenuDragMouseDragged(MenuDragMouseEvent event) { |
| 558 | // Guaranteed to return a non-null array |
| 559 | Object[] listeners = listenerList.getListenerList(); |
| 560 | // Process the listeners last to first, notifying |
| 561 | // those that are interested in this event |
| 562 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 563 | if (listeners[i]==MenuDragMouseListener.class) { |
| 564 | // Lazily create the event: |
| 565 | ((MenuDragMouseListener)listeners[i+1]).menuDragMouseDragged(event); |
| 566 | } |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * Notifies all listeners that have registered interest for |
| 572 | * notification on this event type. |
| 573 | * |
| 574 | * @param event a <code>MenuDragMouseEvent</code> |
| 575 | * @see EventListenerList |
| 576 | */ |
| 577 | protected void fireMenuDragMouseReleased(MenuDragMouseEvent event) { |
| 578 | // Guaranteed to return a non-null array |
| 579 | Object[] listeners = listenerList.getListenerList(); |
| 580 | // Process the listeners last to first, notifying |
| 581 | // those that are interested in this event |
| 582 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 583 | if (listeners[i]==MenuDragMouseListener.class) { |
| 584 | // Lazily create the event: |
| 585 | ((MenuDragMouseListener)listeners[i+1]).menuDragMouseReleased(event); |
| 586 | } |
| 587 | } |
| 588 | } |
| 589 | |
| 590 | /** |
| 591 | * Notifies all listeners that have registered interest for |
| 592 | * notification on this event type. |
| 593 | * |
| 594 | * @param event a <code>MenuKeyEvent</code> |
| 595 | * @see EventListenerList |
| 596 | */ |
| 597 | protected void fireMenuKeyPressed(MenuKeyEvent event) { |
| 598 | if (DEBUG) { |
| 599 | System.out.println("in JMenuItem.fireMenuKeyPressed for " + getText()+ |
| 600 | " " + KeyStroke.getKeyStrokeForEvent(event)); |
| 601 | } |
| 602 | // Guaranteed to return a non-null array |
| 603 | Object[] listeners = listenerList.getListenerList(); |
| 604 | // Process the listeners last to first, notifying |
| 605 | // those that are interested in this event |
| 606 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 607 | if (listeners[i]==MenuKeyListener.class) { |
| 608 | // Lazily create the event: |
| 609 | ((MenuKeyListener)listeners[i+1]).menuKeyPressed(event); |
| 610 | } |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | /** |
| 615 | * Notifies all listeners that have registered interest for |
| 616 | * notification on this event type. |
| 617 | * |
| 618 | * @param event a <code>MenuKeyEvent</code> |
| 619 | * @see EventListenerList |
| 620 | */ |
| 621 | protected void fireMenuKeyReleased(MenuKeyEvent event) { |
| 622 | if (DEBUG) { |
| 623 | System.out.println("in JMenuItem.fireMenuKeyReleased for " + getText()+ |
| 624 | " " + KeyStroke.getKeyStrokeForEvent(event)); |
| 625 | } |
| 626 | // Guaranteed to return a non-null array |
| 627 | Object[] listeners = listenerList.getListenerList(); |
| 628 | // Process the listeners last to first, notifying |
| 629 | // those that are interested in this event |
| 630 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 631 | if (listeners[i]==MenuKeyListener.class) { |
| 632 | // Lazily create the event: |
| 633 | ((MenuKeyListener)listeners[i+1]).menuKeyReleased(event); |
| 634 | } |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | /** |
| 639 | * Notifies all listeners that have registered interest for |
| 640 | * notification on this event type. |
| 641 | * |
| 642 | * @param event a <code>MenuKeyEvent</code> |
| 643 | * @see EventListenerList |
| 644 | */ |
| 645 | protected void fireMenuKeyTyped(MenuKeyEvent event) { |
| 646 | if (DEBUG) { |
| 647 | System.out.println("in JMenuItem.fireMenuKeyTyped for " + getText()+ |
| 648 | " " + KeyStroke.getKeyStrokeForEvent(event)); |
| 649 | } |
| 650 | // Guaranteed to return a non-null array |
| 651 | Object[] listeners = listenerList.getListenerList(); |
| 652 | // Process the listeners last to first, notifying |
| 653 | // those that are interested in this event |
| 654 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 655 | if (listeners[i]==MenuKeyListener.class) { |
| 656 | // Lazily create the event: |
| 657 | ((MenuKeyListener)listeners[i+1]).menuKeyTyped(event); |
| 658 | } |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | /** |
| 663 | * Called by the <code>MenuSelectionManager</code> when the |
| 664 | * <code>MenuElement</code> is selected or unselected. |
| 665 | * |
| 666 | * @param isIncluded true if this menu item is on the part of the menu |
| 667 | * path that changed, false if this menu is part of the |
| 668 | * a menu path that changed, but this particular part of |
| 669 | * that path is still the same |
| 670 | * @see MenuSelectionManager#setSelectedPath(MenuElement[]) |
| 671 | */ |
| 672 | public void menuSelectionChanged(boolean isIncluded) { |
| 673 | setArmed(isIncluded); |
| 674 | } |
| 675 | |
| 676 | /** |
| 677 | * This method returns an array containing the sub-menu |
| 678 | * components for this menu component. |
| 679 | * |
| 680 | * @return an array of <code>MenuElement</code>s |
| 681 | */ |
| 682 | public MenuElement[] getSubElements() { |
| 683 | return new MenuElement[0]; |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * Returns the <code>java.awt.Component</code> used to paint |
| 688 | * this object. The returned component will be used to convert |
| 689 | * events and detect if an event is inside a menu component. |
| 690 | * |
| 691 | * @return the <code>Component</code> that paints this menu item |
| 692 | */ |
| 693 | public Component getComponent() { |
| 694 | return this; |
| 695 | } |
| 696 | |
| 697 | /** |
| 698 | * Adds a <code>MenuDragMouseListener</code> to the menu item. |
| 699 | * |
| 700 | * @param l the <code>MenuDragMouseListener</code> to be added |
| 701 | */ |
| 702 | public void addMenuDragMouseListener(MenuDragMouseListener l) { |
| 703 | listenerList.add(MenuDragMouseListener.class, l); |
| 704 | } |
| 705 | |
| 706 | /** |
| 707 | * Removes a <code>MenuDragMouseListener</code> from the menu item. |
| 708 | * |
| 709 | * @param l the <code>MenuDragMouseListener</code> to be removed |
| 710 | */ |
| 711 | public void removeMenuDragMouseListener(MenuDragMouseListener l) { |
| 712 | listenerList.remove(MenuDragMouseListener.class, l); |
| 713 | } |
| 714 | |
| 715 | /** |
| 716 | * Returns an array of all the <code>MenuDragMouseListener</code>s added |
| 717 | * to this JMenuItem with addMenuDragMouseListener(). |
| 718 | * |
| 719 | * @return all of the <code>MenuDragMouseListener</code>s added or an empty |
| 720 | * array if no listeners have been added |
| 721 | * @since 1.4 |
| 722 | */ |
| 723 | public MenuDragMouseListener[] getMenuDragMouseListeners() { |
| 724 | return (MenuDragMouseListener[])listenerList.getListeners( |
| 725 | MenuDragMouseListener.class); |
| 726 | } |
| 727 | |
| 728 | /** |
| 729 | * Adds a <code>MenuKeyListener</code> to the menu item. |
| 730 | * |
| 731 | * @param l the <code>MenuKeyListener</code> to be added |
| 732 | */ |
| 733 | public void addMenuKeyListener(MenuKeyListener l) { |
| 734 | listenerList.add(MenuKeyListener.class, l); |
| 735 | } |
| 736 | |
| 737 | /** |
| 738 | * Removes a <code>MenuKeyListener</code> from the menu item. |
| 739 | * |
| 740 | * @param l the <code>MenuKeyListener</code> to be removed |
| 741 | */ |
| 742 | public void removeMenuKeyListener(MenuKeyListener l) { |
| 743 | listenerList.remove(MenuKeyListener.class, l); |
| 744 | } |
| 745 | |
| 746 | /** |
| 747 | * Returns an array of all the <code>MenuKeyListener</code>s added |
| 748 | * to this JMenuItem with addMenuKeyListener(). |
| 749 | * |
| 750 | * @return all of the <code>MenuKeyListener</code>s added or an empty |
| 751 | * array if no listeners have been added |
| 752 | * @since 1.4 |
| 753 | */ |
| 754 | public MenuKeyListener[] getMenuKeyListeners() { |
| 755 | return (MenuKeyListener[])listenerList.getListeners( |
| 756 | MenuKeyListener.class); |
| 757 | } |
| 758 | |
| 759 | /** |
| 760 | * See JComponent.readObject() for information about serialization |
| 761 | * in Swing. |
| 762 | */ |
| 763 | private void readObject(ObjectInputStream s) |
| 764 | throws IOException, ClassNotFoundException |
| 765 | { |
| 766 | s.defaultReadObject(); |
| 767 | if (getUIClassID().equals(uiClassID)) { |
| 768 | updateUI(); |
| 769 | } |
| 770 | } |
| 771 | |
| 772 | private void writeObject(ObjectOutputStream s) throws IOException { |
| 773 | s.defaultWriteObject(); |
| 774 | if (getUIClassID().equals(uiClassID)) { |
| 775 | byte count = JComponent.getWriteObjCounter(this); |
| 776 | JComponent.setWriteObjCounter(this, --count); |
| 777 | if (count == 0 && ui != null) { |
| 778 | ui.installUI(this); |
| 779 | } |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | |
| 784 | /** |
| 785 | * Returns a string representation of this <code>JMenuItem</code>. |
| 786 | * This method is intended to be used only for debugging purposes, |
| 787 | * and the content and format of the returned string may vary between |
| 788 | * implementations. The returned string may be empty but may not |
| 789 | * be <code>null</code>. |
| 790 | * |
| 791 | * @return a string representation of this <code>JMenuItem</code> |
| 792 | */ |
| 793 | protected String paramString() { |
| 794 | return super.paramString(); |
| 795 | } |
| 796 | |
| 797 | ///////////////// |
| 798 | // Accessibility support |
| 799 | //////////////// |
| 800 | |
| 801 | /** |
| 802 | * Returns the <code>AccessibleContext</code> associated with this |
| 803 | * <code>JMenuItem</code>. For <code>JMenuItem</code>s, |
| 804 | * the <code>AccessibleContext</code> takes the form of an |
| 805 | * <code>AccessibleJMenuItem</code>. |
| 806 | * A new AccessibleJMenuItme instance is created if necessary. |
| 807 | * |
| 808 | * @return an <code>AccessibleJMenuItem</code> that serves as the |
| 809 | * <code>AccessibleContext</code> of this <code>JMenuItem</code> |
| 810 | */ |
| 811 | public AccessibleContext getAccessibleContext() { |
| 812 | if (accessibleContext == null) { |
| 813 | accessibleContext = new AccessibleJMenuItem(); |
| 814 | } |
| 815 | return accessibleContext; |
| 816 | } |
| 817 | |
| 818 | |
| 819 | /** |
| 820 | * This class implements accessibility support for the |
| 821 | * <code>JMenuItem</code> class. It provides an implementation of the |
| 822 | * Java Accessibility API appropriate to menu item user-interface |
| 823 | * elements. |
| 824 | * <p> |
| 825 | * <strong>Warning:</strong> |
| 826 | * Serialized objects of this class will not be compatible with |
| 827 | * future Swing releases. The current serialization support is |
| 828 | * appropriate for short term storage or RMI between applications running |
| 829 | * the same version of Swing. As of 1.4, support for long term storage |
| 830 | * of all JavaBeans<sup><font size="-2">TM</font></sup> |
| 831 | * has been added to the <code>java.beans</code> package. |
| 832 | * Please see {@link java.beans.XMLEncoder}. |
| 833 | */ |
| 834 | protected class AccessibleJMenuItem extends AccessibleAbstractButton implements ChangeListener { |
| 835 | |
| 836 | private boolean isArmed = false; |
| 837 | private boolean hasFocus = false; |
| 838 | private boolean isPressed = false; |
| 839 | private boolean isSelected = false; |
| 840 | |
| 841 | AccessibleJMenuItem() { |
| 842 | super(); |
| 843 | JMenuItem.this.addChangeListener(this); |
| 844 | } |
| 845 | |
| 846 | /** |
| 847 | * Get the role of this object. |
| 848 | * |
| 849 | * @return an instance of AccessibleRole describing the role of the |
| 850 | * object |
| 851 | */ |
| 852 | public AccessibleRole getAccessibleRole() { |
| 853 | return AccessibleRole.MENU_ITEM; |
| 854 | } |
| 855 | |
| 856 | private void fireAccessibilityFocusedEvent(JMenuItem toCheck) { |
| 857 | MenuElement [] path = |
| 858 | MenuSelectionManager.defaultManager().getSelectedPath(); |
| 859 | if (path.length > 0) { |
| 860 | Object menuItem = path[path.length - 1]; |
| 861 | if (toCheck == menuItem) { |
| 862 | firePropertyChange( |
| 863 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 864 | null, AccessibleState.FOCUSED); |
| 865 | } |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | /** |
| 870 | * Supports the change listener interface and fires property changes. |
| 871 | */ |
| 872 | public void stateChanged(ChangeEvent e) { |
| 873 | firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY, |
| 874 | Boolean.valueOf(false), Boolean.valueOf(true)); |
| 875 | if (JMenuItem.this.getModel().isArmed()) { |
| 876 | if (!isArmed) { |
| 877 | isArmed = true; |
| 878 | firePropertyChange( |
| 879 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 880 | null, AccessibleState.ARMED); |
| 881 | // Fix for 4848220 moved here to avoid major memory leak |
| 882 | // Here we will fire the event in case of JMenuItem |
| 883 | // See bug 4910323 for details [zav] |
| 884 | fireAccessibilityFocusedEvent(JMenuItem.this); |
| 885 | } |
| 886 | } else { |
| 887 | if (isArmed) { |
| 888 | isArmed = false; |
| 889 | firePropertyChange( |
| 890 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 891 | AccessibleState.ARMED, null); |
| 892 | } |
| 893 | } |
| 894 | if (JMenuItem.this.isFocusOwner()) { |
| 895 | if (!hasFocus) { |
| 896 | hasFocus = true; |
| 897 | firePropertyChange( |
| 898 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 899 | null, AccessibleState.FOCUSED); |
| 900 | } |
| 901 | } else { |
| 902 | if (hasFocus) { |
| 903 | hasFocus = false; |
| 904 | firePropertyChange( |
| 905 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 906 | AccessibleState.FOCUSED, null); |
| 907 | } |
| 908 | } |
| 909 | if (JMenuItem.this.getModel().isPressed()) { |
| 910 | if (!isPressed) { |
| 911 | isPressed = true; |
| 912 | firePropertyChange( |
| 913 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 914 | null, AccessibleState.PRESSED); |
| 915 | } |
| 916 | } else { |
| 917 | if (isPressed) { |
| 918 | isPressed = false; |
| 919 | firePropertyChange( |
| 920 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 921 | AccessibleState.PRESSED, null); |
| 922 | } |
| 923 | } |
| 924 | if (JMenuItem.this.getModel().isSelected()) { |
| 925 | if (!isSelected) { |
| 926 | isSelected = true; |
| 927 | firePropertyChange( |
| 928 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 929 | null, AccessibleState.CHECKED); |
| 930 | |
| 931 | // Fix for 4848220 moved here to avoid major memory leak |
| 932 | // Here we will fire the event in case of JMenu |
| 933 | // See bug 4910323 for details [zav] |
| 934 | fireAccessibilityFocusedEvent(JMenuItem.this); |
| 935 | } |
| 936 | } else { |
| 937 | if (isSelected) { |
| 938 | isSelected = false; |
| 939 | firePropertyChange( |
| 940 | AccessibleContext.ACCESSIBLE_STATE_PROPERTY, |
| 941 | AccessibleState.CHECKED, null); |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | } |
| 946 | } // inner class AccessibleJMenuItem |
| 947 | |
| 948 | |
| 949 | } |