Java API By Example, From Geeks To Geeks.

1 /******************************************************************************* 2  * Copyright (c) 2000, 2007 IBM Corporation and others. 3  * All rights reserved. This program and the accompanying materials 4  * are made available under the terms of the Eclipse Public License v1.0 5  * which accompanies this distribution, and is available at 6  * http://www.eclipse.org/legal/epl-v10.html 7  * 8  * Contributors: 9  * IBM Corporation - initial API and implementation 10  *******************************************************************************/ 11 package org.eclipse.swt.widgets; 12 13 14 import org.eclipse.swt.internal.*; 15 import org.eclipse.swt.internal.win32.*; 16 import org.eclipse.swt.*; 17 import org.eclipse.swt.graphics.*; 18 import org.eclipse.swt.events.*; 19 20 /** 21  * This class is the abstract superclass of all user interface objects. 22  * Widgets are created, disposed and issue notification to listeners 23  * when events occur which affect them. 24  * <dl> 25  * <dt><b>Styles:</b></dt> 26  * <dd>(none)</dd> 27  * <dt><b>Events:</b></dt> 28  * <dd>Dispose</dd> 29  * </dl> 30  * <p> 31  * IMPORTANT: This class is intended to be subclassed <em>only</em> 32  * within the SWT implementation. However, it has not been marked 33  * final to allow those outside of the SWT development team to implement 34  * patched versions of the class in order to get around specific 35  * limitations in advance of when those limitations can be addressed 36  * by the team. Any class built using subclassing to access the internals 37  * of this class will likely fail to compile or run between releases and 38  * may be strongly platform specific. Subclassing should not be attempted 39  * without an intimate and detailed understanding of the workings of the 40  * hierarchy. No support is provided for user-written classes which are 41  * implemented as subclasses of this class. 42  * </p> 43  * 44  * @see #checkSubclass 45  */ 46 47 public abstract class Widget { 48     int style, state; 49     Display display; 50     EventTable eventTable; 51     Object data; 52 53     /* Global state flags */ 54     static final int DISPOSED = 1<<0; 55     static final int CANVAS = 1<<1; 56     static final int KEYED_DATA = 1<<2; 57     static final int DISABLED = 1<<3; 58     static final int HIDDEN = 1<<4; 59      60     /* A layout was requested on this widget */ 61     static final int LAYOUT_NEEDED = 1<<5; 62      63     /* The preferred size of a child has changed */ 64     static final int LAYOUT_CHANGED = 1<<6; 65      66     /* A layout was requested in this widget hierarchy */ 67     static final int LAYOUT_CHILD = 1<<7; 68 69     /* Background flags */ 70     static final int THEME_BACKGROUND = 1<<8; 71     static final int DRAW_BACKGROUND = 1<<9; 72     static final int PARENT_BACKGROUND = 1<<10; 73      74     /* Dispose and release flags */ 75     static final int RELEASED = 1<<11; 76     static final int DISPOSE_SENT = 1<<12; 77      78     /* More global widget state flags */ 79     static final int TRACK_MOUSE = 1<<13; 80     static final int FOREIGN_HANDLE = 1<<14; 81     static final int DRAG_DETECT = 1<<15; 82 83     /* Default size for widgets */ 84     static final int DEFAULT_WIDTH = 64; 85     static final int DEFAULT_HEIGHT = 64; 86 87     /* Check and initialize the Common Controls DLL */ 88     static final int MAJOR = 5, MINOR = 80; 89     static { 90         if (!OS.IsWinCE) { 91             if (OS.COMCTL32_VERSION < OS.VERSION (MAJOR, MINOR)) { 92                 System.out.println ("***WARNING: SWT requires comctl32.dll version " + MAJOR + "." + MINOR + " or greater"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ 93 System.out.println ("***WARNING: Detected: " + OS.COMCTL32_MAJOR + "." + OS.COMCTL32_MINOR); //$NON-NLS-1$ //$NON-NLS-2$ 94 } 95         } 96         OS.InitCommonControls (); 97     } 98      99 /** 100  * Prevents uninitialized instances from being created outside the package. 101  */ 102 Widget () { 103 } 104 105 /** 106  * Constructs a new instance of this class given its parent 107  * and a style value describing its behavior and appearance. 108  * <p> 109  * The style value is either one of the style constants defined in 110  * class <code>SWT</code> which is applicable to instances of this 111  * class, or must be built by <em>bitwise OR</em>'ing together 112  * (that is, using the <code>int</code> "|" operator) two or more 113  * of those <code>SWT</code> style constants. The class description 114  * lists the style constants that are applicable to the class. 115  * Style bits are also inherited from superclasses. 116  * </p> 117  * 118  * @param parent a widget which will be the parent of the new instance (cannot be null) 119  * @param style the style of widget to construct 120  * 121  * @exception IllegalArgumentException <ul> 122  * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> 123  * <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li> 124  * </ul> 125  * @exception SWTException <ul> 126  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> 127  * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> 128  * </ul> 129  * 130  * @see SWT 131  * @see #checkSubclass 132  * @see #getStyle 133  */ 134 public Widget (Widget parent, int style) { 135     checkSubclass (); 136     checkParent (parent); 137     this.style = style; 138     display = parent.display; 139 } 140 141 void _addListener (int eventType, Listener listener) { 142     if (eventTable == null) eventTable = new EventTable (); 143     eventTable.hook (eventType, listener); 144 } 145 146 /** 147  * Adds the listener to the collection of listeners who will 148  * be notified when an event of the given type occurs. When the 149  * event does occur in the widget, the listener is notified by 150  * sending it the <code>handleEvent()</code> message. The event 151  * type is one of the event constants defined in class <code>SWT</code>. 152  * 153  * @param eventType the type of event to listen for 154  * @param listener the listener which should be notified when the event occurs 155  * 156  * @exception IllegalArgumentException <ul> 157  * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> 158  * </ul> 159  * @exception SWTException <ul> 160  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 161  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 162  * </ul> 163  * 164  * @see Listener 165  * @see SWT 166  * @see #removeListener(int, Listener) 167  * @see #notifyListeners 168  */ 169 public void addListener (int eventType, Listener listener) { 170     checkWidget(); 171     if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); 172     _addListener (eventType, listener); 173 } 174 175 /** 176  * Adds the listener to the collection of listeners who will 177  * be notified when the widget is disposed. When the widget is 178  * disposed, the listener is notified by sending it the 179  * <code>widgetDisposed()</code> message. 180  * 181  * @param listener the listener which should be notified when the receiver is disposed 182  * 183  * @exception IllegalArgumentException <ul> 184  * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> 185  * </ul> 186  * @exception SWTException <ul> 187  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 188  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 189  * </ul> 190  * 191  * @see DisposeListener 192  * @see #removeDisposeListener 193  */ 194 public void addDisposeListener (DisposeListener listener) { 195     checkWidget(); 196     if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); 197     TypedListener typedListener = new TypedListener (listener); 198     addListener (SWT.Dispose, typedListener); 199 } 200 201 int callWindowProc (int hwnd, int msg, int wParam, int lParam) { 202     return 0; 203 } 204 205 /** 206  * Returns a style with exactly one style bit set out of 207  * the specified set of exclusive style bits. All other 208  * possible bits are cleared when the first matching bit 209  * is found. Bits that are not part of the possible set 210  * are untouched. 211  * 212  * @param style the original style bits 213  * @param int0 the 0th possible style bit 214  * @param int1 the 1st possible style bit 215  * @param int2 the 2nd possible style bit 216  * @param int3 the 3rd possible style bit 217  * @param int4 the 4th possible style bit 218  * @param int5 the 5th possible style bit 219  * 220  * @return the new style bits 221  */ 222 static int checkBits (int style, int int0, int int1, int int2, int int3, int int4, int int5) { 223     int mask = int0 | int1 | int2 | int3 | int4 | int5; 224     if ((style & mask) == 0) style |= int0; 225     if ((style & int0) != 0) style = (style & ~mask) | int0; 226     if ((style & int1) != 0) style = (style & ~mask) | int1; 227     if ((style & int2) != 0) style = (style & ~mask) | int2; 228     if ((style & int3) != 0) style = (style & ~mask) | int3; 229     if ((style & int4) != 0) style = (style & ~mask) | int4; 230     if ((style & int5) != 0) style = (style & ~mask) | int5; 231     return style; 232 } 233 234 void checkOrientation (Widget parent) { 235     style &= ~SWT.MIRRORED; 236     if ((style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT)) == 0) { 237         if (parent != null) { 238             if ((parent.style & SWT.LEFT_TO_RIGHT) != 0) style |= SWT.LEFT_TO_RIGHT; 239             if ((parent.style & SWT.RIGHT_TO_LEFT) != 0) style |= SWT.RIGHT_TO_LEFT; 240         } 241     } 242     style = checkBits (style, SWT.LEFT_TO_RIGHT, SWT.RIGHT_TO_LEFT, 0, 0, 0, 0); 243 } 244 245 void checkOpened () { 246     /* Do nothing */ 247 } 248 249 /** 250  * Throws an exception if the specified widget can not be 251  * used as a parent for the receiver. 252  * 253  * @exception IllegalArgumentException <ul> 254  * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> 255  * <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li> 256  * </ul> 257  * @exception SWTException <ul> 258  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> 259  * </ul> 260  */ 261 void checkParent (Widget parent) { 262     if (parent == null) error (SWT.ERROR_NULL_ARGUMENT); 263     if (parent.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT); 264     parent.checkWidget (); 265     parent.checkOpened (); 266 } 267 268 /** 269  * Checks that this class can be subclassed. 270  * <p> 271  * The SWT class library is intended to be subclassed 272  * only at specific, controlled points (most notably, 273  * <code>Composite</code> and <code>Canvas</code> when 274  * implementing new widgets). This method enforces this 275  * rule unless it is overridden. 276  * </p><p> 277  * <em>IMPORTANT:</em> By providing an implementation of this 278  * method that allows a subclass of a class which does not 279  * normally allow subclassing to be created, the implementer 280  * agrees to be fully responsible for the fact that any such 281  * subclass will likely fail between SWT releases and will be 282  * strongly platform specific. No support is provided for 283  * user-written classes which are implemented in this fashion. 284  * </p><p> 285  * The ability to subclass outside of the allowed SWT classes 286  * is intended purely to enable those not on the SWT development 287  * team to implement patches in order to get around specific 288  * limitations in advance of when those limitations can be 289  * addressed by the team. Subclassing should not be attempted 290  * without an intimate and detailed understanding of the hierarchy. 291  * </p> 292  * 293  * @exception SWTException <ul> 294  * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> 295  * </ul> 296  */ 297 protected void checkSubclass () { 298     if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS); 299 } 300 301 /** 302  * Throws an <code>SWTException</code> if the receiver can not 303  * be accessed by the caller. This may include both checks on 304  * the state of the receiver and more generally on the entire 305  * execution context. This method <em>should</em> be called by 306  * widget implementors to enforce the standard SWT invariants. 307  * <p> 308  * Currently, it is an error to invoke any method (other than 309  * <code>isDisposed()</code>) on a widget that has had its 310  * <code>dispose()</code> method called. It is also an error 311  * to call widget methods from any thread that is different 312  * from the thread that created the widget. 313  * </p><p> 314  * In future releases of SWT, there may be more or fewer error 315  * checks and exceptions may be thrown for different reasons. 316  * </p> 317  * 318  * @exception SWTException <ul> 319  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 320  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 321  * </ul> 322  */ 323 protected void checkWidget () { 324     Display display = this.display; 325     if (display == null) error (SWT.ERROR_WIDGET_DISPOSED); 326     if (display.thread != Thread.currentThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); 327     if ((state & DISPOSED) != 0) error (SWT.ERROR_WIDGET_DISPOSED); 328 } 329 330 /** 331  * Destroys the widget in the operating system and releases 332  * the widget's handle. If the widget does not have a handle, 333  * this method may hide the widget, mark the widget as destroyed 334  * or do nothing, depending on the widget. 335  * <p> 336  * When a widget is destroyed in the operating system, its 337  * descendants are also destroyed by the operating system. 338  * This means that it is only necessary to call <code>destroyWidget</code> 339  * on the root of the widget tree. 340  * </p><p> 341  * This method is called after <code>releaseWidget()</code>. 342  * </p><p> 343  * See also <code>releaseChild()</code>, <code>releaseWidget()</code> 344  * and <code>releaseHandle()</code>. 345  * </p> 346  * 347  * @see #dispose 348  */ 349 void destroyWidget () { 350     releaseHandle (); 351 } 352 353 int DeferWindowPos(int hWinPosInfo, int hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags){ 354     if (OS.IsWinCE) { 355         /* 356         * Feature in Windows. On Windows CE, DeferWindowPos always causes 357         * a WM_SIZE message, even when the new size is the same as the old 358         * size. The fix is to detect that the size has not changed and set 359         * SWP_NOSIZE. 360         */ 361         if ((uFlags & OS.SWP_NOSIZE) == 0) { 362             RECT lpRect = new RECT (); 363             OS.GetWindowRect (hWnd, lpRect); 364             if (cy == lpRect.bottom - lpRect.top && cx == lpRect.right - lpRect.left) { 365                 /* 366                 * Feature in Windows. On Windows CE, DeferWindowPos when called 367                 * with SWP_DRAWFRAME always causes a WM_SIZE message, even 368                 * when SWP_NOSIZE is set and when the new size is the same as the 369                 * old size. The fix is to clear SWP_DRAWFRAME when the size is 370                 * the same. 371                 */ 372                 uFlags &= ~OS.SWP_DRAWFRAME; 373                 uFlags |= OS.SWP_NOSIZE; 374             } 375         } 376     } 377     return OS.DeferWindowPos (hWinPosInfo, hWnd, hWndInsertAfter, X, Y, cx, cy, uFlags); 378 } 379 380 /** 381  * Disposes of the operating system resources associated with 382  * the receiver and all its descendants. After this method has 383  * been invoked, the receiver and all descendants will answer 384  * <code>true</code> when sent the message <code>isDisposed()</code>. 385  * Any internal connections between the widgets in the tree will 386  * have been removed to facilitate garbage collection. 387  * <p> 388  * NOTE: This method is not called recursively on the descendants 389  * of the receiver. This means that, widget implementers can not 390  * detect when a widget is being disposed of by re-implementing 391  * this method, but should instead listen for the <code>Dispose</code> 392  * event. 393  * </p> 394  * 395  * @exception SWTException <ul> 396  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 397  * </ul> 398  * 399  * @see #addDisposeListener 400  * @see #removeDisposeListener 401  * @see #checkWidget 402  */ 403 public void dispose () { 404     /* 405     * Note: It is valid to attempt to dispose a widget 406     * more than once. If this happens, fail silently. 407     */ 408     if (isDisposed ()) return; 409     if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS); 410     release (true); 411 } 412 413 boolean dragDetect (int hwnd, int x, int y, boolean filter, boolean [] detect, boolean [] consume) { 414     if (consume != null) consume [0] = false; 415     if (detect != null) detect [0] = true; 416     POINT pt = new POINT (); 417     pt.x = x; 418     pt.y = y; 419     OS.ClientToScreen (hwnd, pt); 420     return OS.DragDetect (hwnd, pt); 421 } 422 423 /** 424  * Does whatever widget specific cleanup is required, and then 425  * uses the code in <code>SWTError.error</code> to handle the error. 426  * 427  * @param code the descriptive error code 428  * 429  * @see SWT#error(int) 430  */ 431 void error (int code) { 432     SWT.error(code); 433 } 434 435 boolean filters (int eventType) { 436     return display.filters (eventType); 437 } 438 439 Widget findItem (int id) { 440     return null; 441 } 442 443 char [] fixMnemonic (String string) { 444     char [] buffer = new char [string.length ()]; 445     string.getChars (0, string.length (), buffer, 0); 446     int i = 0, j = 0; 447     while (i < buffer.length) { 448         if (buffer [i] == '&') { 449             if (i + 1 < buffer.length && buffer [i + 1] == '&') { 450                 buffer [j++] = ' '; 451                 i++; 452             } 453             i++; 454         } else { 455             buffer [j++] = buffer [i++]; 456         } 457     } 458     while (j < buffer.length) buffer [j++] = 0; 459     return buffer; 460 } 461 462 /** 463  * Returns the application defined widget data associated 464  * with the receiver, or null if it has not been set. The 465  * <em>widget data</em> is a single, unnamed field that is 466  * stored with every widget. 467  * <p> 468  * Applications may put arbitrary objects in this field. If 469  * the object stored in the widget data needs to be notified 470  * when the widget is disposed of, it is the application's 471  * responsibility to hook the Dispose event on the widget and 472  * do so. 473  * </p> 474  * 475  * @return the widget data 476  * 477  * @exception SWTException <ul> 478  * <li>ERROR_WIDGET_DISPOSED - when the receiver has been disposed</li> 479  * <li>ERROR_THREAD_INVALID_ACCESS - when called from the wrong thread</li> 480  * </ul> 481  * 482  * @see #setData(Object) 483  */ 484 public Object getData () { 485     checkWidget(); 486     return (state & KEYED_DATA) != 0 ? ((Object []) data) [0] : data; 487 } 488 489 /** 490  * Returns the application defined property of the receiver 491  * with the specified name, or null if it has not been set. 492  * <p> 493  * Applications may have associated arbitrary objects with the 494  * receiver in this fashion. If the objects stored in the 495  * properties need to be notified when the widget is disposed 496  * of, it is the application's responsibility to hook the 497  * Dispose event on the widget and do so. 498  * </p> 499  * 500  * @param key the name of the property 501  * @return the value of the property or null if it has not been set 502  * 503  * @exception IllegalArgumentException <ul> 504  * <li>ERROR_NULL_ARGUMENT - if the key is null</li> 505  * </ul> 506  * @exception SWTException <ul> 507  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 508  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 509  * </ul> 510  * 511  * @see #setData(String, Object) 512  */ 513 public Object getData (String key) { 514     checkWidget(); 515     if (key == null) error (SWT.ERROR_NULL_ARGUMENT); 516     if ((state & KEYED_DATA) != 0) { 517         Object [] table = (Object []) data; 518         for (int i=1; i<table.length; i+=2) { 519             if (key.equals (table [i])) return table [i+1]; 520         } 521     } 522     return null; 523 } 524 525 /** 526  * Returns the <code>Display</code> that is associated with 527  * the receiver. 528  * <p> 529  * A widget's display is either provided when it is created 530  * (for example, top level <code>Shell</code>s) or is the 531  * same as its parent's display. 532  * </p> 533  * 534  * @return the receiver's display 535  * 536  * @exception SWTException <ul> 537  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 538  * </ul> 539  */ 540 public Display getDisplay () { 541     Display display = this.display; 542     if (display == null) error (SWT.ERROR_WIDGET_DISPOSED); 543     return display; 544 } 545 546 Menu getMenu () { 547     return null; 548 } 549 550 /** 551  * Returns the name of the widget. This is the name of 552  * the class without the package name. 553  * 554  * @return the name of the widget 555  */ 556 String getName () { 557     String string = getClass ().getName (); 558     int index = string.lastIndexOf ('.'); 559     if (index == -1) return string; 560     return string.substring (index + 1, string.length ()); 561 } 562 563 /* 564  * Returns a short printable representation for the contents 565  * of a widget. For example, a button may answer the label 566  * text. This is used by <code>toString</code> to provide a 567  * more meaningful description of the widget. 568  * 569  * @return the contents string for the widget 570  * 571  * @see #toString 572  */ 573 String getNameText () { 574     return ""; //$NON-NLS-1$ 575 } 576 577 /** 578  * Returns the receiver's style information. 579  * <p> 580  * Note that the value which is returned by this method <em>may 581  * not match</em> the value which was provided to the constructor 582  * when the receiver was created. This can occur when the underlying 583  * operating system does not support a particular combination of 584  * requested styles. For example, if the platform widget used to 585  * implement a particular SWT widget always has scroll bars, the 586  * result of calling this method would always have the 587  * <code>SWT.H_SCROLL</code> and <code>SWT.V_SCROLL</code> bits set. 588  * </p> 589  * 590  * @return the style bits 591  * 592  * @exception SWTException <ul> 593  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 594  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 595  * </ul> 596  */ 597 public int getStyle () { 598     checkWidget(); 599     return style; 600 } 601 602 /* 603  * Returns <code>true</code> if the specified eventType is 604  * hooked, and <code>false</code> otherwise. Implementations 605  * of SWT can avoid creating objects and sending events 606  * when an event happens in the operating system but 607  * there are no listeners hooked for the event. 608  * 609  * @param eventType the event to be checked 610  * 611  * @return <code>true</code> when the eventType is hooked and <code>false</code> otherwise 612  * 613  * @see #isListening 614  */ 615 boolean hooks (int eventType) { 616     if (eventTable == null) return false; 617     return eventTable.hooks (eventType); 618 } 619 620 /** 621  * Returns <code>true</code> if the widget has been disposed, 622  * and <code>false</code> otherwise. 623  * <p> 624  * This method gets the dispose state for the widget. 625  * When a widget has been disposed, it is an error to 626  * invoke any other method using the widget. 627  * </p> 628  * 629  * @return <code>true</code> when the widget is disposed and <code>false</code> otherwise 630  */ 631 public boolean isDisposed () { 632     return (state & DISPOSED) != 0; 633 } 634 635 /** 636  * Returns <code>true</code> if there are any listeners 637  * for the specified event type associated with the receiver, 638  * and <code>false</code> otherwise. The event type is one of 639  * the event constants defined in class <code>SWT</code>. 640  * 641  * @param eventType the type of event 642  * @return true if the event is hooked 643  * 644  * @exception SWTException <ul> 645  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 646  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 647  * </ul> 648  * 649  * @see SWT 650  */ 651 public boolean isListening (int eventType) { 652     checkWidget(); 653     return hooks (eventType); 654 } 655 656 /* 657  * Returns <code>true</code> when subclassing is 658  * allowed and <code>false</code> otherwise 659  * 660  * @return <code>true</code> when subclassing is allowed and <code>false</code> otherwise 661  */ 662 boolean isValidSubclass () { 663     return Display.isValidClass (getClass ()); 664 } 665 666 /* 667  * Returns <code>true</code> when the current thread is 668  * the thread that created the widget and <code>false</code> 669  * otherwise. 670  * 671  * @return <code>true</code> when the current thread is the thread that created the widget and <code>false</code> otherwise 672  */ 673 boolean isValidThread () { 674     return getDisplay ().isValidThread (); 675 } 676 677 void mapEvent (int hwnd, Event event) { 678 } 679 680 GC new_GC (GCData data) { 681     return null; 682 } 683 684 /** 685  * Notifies all of the receiver's listeners for events 686  * of the given type that one such event has occurred by 687  * invoking their <code>handleEvent()</code> method. The 688  * event type is one of the event constants defined in class 689  * <code>SWT</code>. 690  * 691  * @param eventType the type of event which has occurred 692  * @param event the event data 693  * 694  * @exception SWTException <ul> 695  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 696  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 697  * </ul> 698  * 699  * @see SWT 700  * @see #addListener 701  * @see #removeListener(int, Listener) 702  */ 703 public void notifyListeners (int eventType, Event event) { 704     checkWidget(); 705     if (event == null) event = new Event (); 706     sendEvent (eventType, event); 707 } 708 709 void postEvent (int eventType) { 710     sendEvent (eventType, null, false); 711 } 712 713 void postEvent (int eventType, Event event) { 714     sendEvent (eventType, event, false); 715 } 716 717 /* 718  * Releases the widget hierarchy and optionally destroys 719  * the receiver. 720  * <p> 721  * Typically, a widget with children will broadcast this 722  * message to all children so that they too can release their 723  * resources. The <code>releaseHandle</code> method is used 724  * as part of this broadcast to zero the handle fields of the 725  * children without calling <code>destroyWidget</code>. In 726  * this scenario, the children are actually destroyed later, 727  * when the operating system destroys the widget tree. 728  * </p> 729  * 730  * @param destroy indicates that the receiver should be destroyed 731  * 732  * @see #dispose 733  * @see #releaseHandle 734  * @see #releaseParent 735  * @see #releaseWidget 736 */ 737 void release (boolean destroy) { 738     if ((state & DISPOSE_SENT) == 0) { 739         state |= DISPOSE_SENT; 740         sendEvent (SWT.Dispose); 741     } 742     if ((state & DISPOSED) == 0) { 743         releaseChildren (destroy); 744     } 745     if ((state & RELEASED) == 0) { 746         state |= RELEASED; 747         if (destroy) { 748             releaseParent (); 749             releaseWidget (); 750             destroyWidget (); 751         } else { 752             releaseWidget (); 753             releaseHandle (); 754         } 755     } 756 } 757 758 void releaseChildren (boolean destroy) { 759 } 760 761 /* 762  * Releases the widget's handle by zero'ing it out. 763  * Does not destroy or release any operating system 764  * resources. 765  * <p> 766  * This method is called after <code>releaseWidget</code> 767  * or from <code>destroyWidget</code> when a widget is being 768  * destroyed to ensure that the widget is marked as destroyed 769  * in case the act of destroying the widget in the operating 770  * system causes application code to run in callback that 771  * could access the widget. 772  * </p> 773  * 774  * @see #dispose 775  * @see #releaseChildren 776  * @see #releaseParent 777  * @see #releaseWidget 778  */ 779 void releaseHandle () { 780     state |= DISPOSED; 781     display = null; 782 } 783 784 /* 785  * Releases the receiver, a child in a widget hierarchy, 786  * from its parent. 787  * <p> 788  * When a widget is destroyed, it may be necessary to remove 789  * it from an internal data structure of the parent. When 790  * a widget has no handle, it may also be necessary for the 791  * parent to hide the widget or otherwise indicate that the 792  * widget has been disposed. For example, disposing a menu 793  * bar requires that the menu bar first be released from the 794  * shell when the menu bar is active. 795  * </p> 796  * 797  * @see #dispose 798  * @see #releaseChildren 799  * @see #releaseWidget 800  * @see #releaseHandle 801  */ 802 void releaseParent () { 803 } 804 805 /* 806  * Releases any internal resources back to the operating 807  * system and clears all fields except the widget handle. 808  * <p> 809  * When a widget is destroyed, resources that were acquired 810  * on behalf of the programmer need to be returned to the 811  * operating system. For example, if the widget made a 812  * copy of an icon, supplied by the programmer, this copy 813  * would be freed in <code>releaseWidget</code>. Also, 814  * to assist the garbage collector and minimize the amount 815  * of memory that is not reclaimed when the programmer keeps 816  * a reference to a disposed widget, all fields except the 817  * handle are zero'd. The handle is needed by <code>destroyWidget</code>. 818  * </p> 819  * 820  * @see #dispose 821  * @see #releaseChildren 822  * @see #releaseHandle 823  * @see #releaseParent 824  */ 825 void releaseWidget () { 826     eventTable = null; 827     data = null; 828 } 829 830 /** 831  * Removes the listener from the collection of listeners who will 832  * be notified when an event of the given type occurs. The event 833  * type is one of the event constants defined in class <code>SWT</code>. 834  * 835  * @param eventType the type of event to listen for 836  * @param listener the listener which should no longer be notified when the event occurs 837  * 838  * @exception IllegalArgumentException <ul> 839  * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> 840  * </ul> 841  * @exception SWTException <ul> 842  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 843  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 844  * </ul> 845  * 846  * @see Listener 847  * @see SWT 848  * @see #addListener 849  * @see #notifyListeners 850  */ 851 public void removeListener (int eventType, Listener listener) { 852     checkWidget(); 853     if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); 854     if (eventTable == null) return; 855     eventTable.unhook (eventType, listener); 856 } 857 858 /** 859  * Removes the listener from the collection of listeners who will 860  * be notified when an event of the given type occurs. 861  * <p> 862  * <b>IMPORTANT:</b> This method is <em>not</em> part of the SWT 863  * public API. It is marked public only so that it can be shared 864  * within the packages provided by SWT. It should never be 865  * referenced from application code. 866  * </p> 867  * 868  * @param eventType the type of event to listen for 869  * @param listener the listener which should no longer be notified when the event occurs 870  * 871  * @exception IllegalArgumentException <ul> 872  * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> 873  * </ul> 874  * @exception SWTException <ul> 875  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 876  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 877  * </ul> 878  * 879  * @see Listener 880  * @see #addListener 881  */ 882 protected void removeListener (int eventType, SWTEventListener listener) { 883     checkWidget(); 884     if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); 885     if (eventTable == null) return; 886     eventTable.unhook (eventType, listener); 887 } 888 889 /** 890  * Removes the listener from the collection of listeners who will 891  * be notified when the widget is disposed. 892  * 893  * @param listener the listener which should no longer be notified when the receiver is disposed 894  * 895  * @exception IllegalArgumentException <ul> 896  * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> 897  * </ul> 898  * @exception SWTException <ul> 899  * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 900  * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 901  * </ul> 902  * 903  * @see DisposeListener 904  * @see #addDisposeListener 905  */ 906 public void removeDisposeListener (DisposeListener listener) { 907     checkWidget(); 908     if (listener == null) error (SWT.ERROR_NULL_ARGUMENT); 909     if (eventTable == null) return; 910     eventTable.unhook (SWT.Dispose, listener); 911 } 912 913 boolean sendDragEvent (int button, int x, int y) { 914     Event event = new Event (); 915     event.button = button; 916     event.x = x; 917     event.y = y; 918     setInputState (event, SWT.DragDetect); 919     postEvent (SWT.DragDetect, event); 920     if (isDisposed ()) return false; 921     return event.doit; 922 } 923 924 boolean sendDragEvent (int button, int stateMask, int x, int y) { 925     Event event = new Event (); 926     event.button = button; 927     event.x = x; 928     event.y = y; 929     event.stateMask = stateMask; 930     postEvent (SWT.DragDetect, event); 931     if (isDisposed ()) return false; 932     return event.doit; 933 } 934 935 void sendEvent (Event event) { 936     Display display = event.display; 937     if (!display.filterEvent (event)) { 938         if (eventTable != null) eventTable.sendEvent (event); 939     } 940 } 941 942 void sendEvent (int eventType) { 943     sendEvent (eventType, null, true); 944 } 945 946 void sendEvent (int eventType, Event event) { 947     sendEvent (eventType, event, true); 948 } 949 950 void sendEvent (int eventType, Event event, boolean send) { 951     if (eventTable == null && !display.filters (eventType)) { 952         return; 953     } 954     if (event == null) event = new Event (); 955     event.type = eventType; 956     event.display = display; 957     event.widget = this; 958     if (event.time == 0) { 959         event.time = display.getLastEventTime (); 960     } 961     if (send) { 962         sendEvent (event); 963     } else { 964         display.postEvent (event); 965     } 966 } 967 968 boolean sendKeyEvent (int type, int msg, int wParam, int lParam) { 969     Event event = new Event (); 970     if (!setKeyState (event, type, wParam, lParam)) return true; 971     return sendKeyEvent (type, msg, wParam, lParam, event); 972 } 973 974 boolean sendKeyEvent (int type, int msg, int wParam, int lParam, Event event) { 975     sendEvent (type, event); 976     if (isDisposed ()) return false; 977     return event.doit; 978 } 979 980 boolean sendMouseEvent (int type, int button, int hwnd, int msg, int wParam, int lParam) { 981     return sendMouseEvent (type, button, display.getClickCount (type, button, hwnd, lParam), 0, false, hwnd, msg, wParam, lParam); 982 } 983 984 boolean sendMouseEvent (int type, int button, int count, int detail, boolean send, int hwnd, int msg, int wParam, int lParam) { 985     if (!hooks (type) && !filters (type)) return true; 986     Event event = new Event (); 987     event.button = button; 988     event.detail = detail; 989     event.count = count; 990     event.x = (short) (lParam & 0xFFFF); 991     event.y = (short) (lParam >> 16); 992     setInputState (event, type); 993     mapEvent (hwnd, event); 994     if (send) { 995         sendEvent (type, event); 996         if (isDisposed ()) return false; 997     } else { 998         postEvent (type, event); 999     } 1000    return event.doit; 1001} 1002 1003/** 1004 * Sets the application defined widget data associated 1005 * with the receiver to be the argument. The <em>widget 1006 * data</em> is a single, unnamed field that is stored 1007 * with every widget. 1008 * <p> 1009 * Applications may put arbitrary objects in this field. If 1010 * the object stored in the widget data needs to be notified 1011 * when the widget is disposed of, it is the application's 1012 * responsibility to hook the Dispose event on the widget and 1013 * do so. 1014 * </p> 1015 * 1016 * @param data the widget data 1017 * 1018 * @exception SWTException <ul> 1019 * <li>ERROR_WIDGET_DISPOSED - when the receiver has been disposed</li> 1020 * <li>ERROR_THREAD_INVALID_ACCESS - when called from the wrong thread</li> 1021 * </ul> 1022 * 1023 * @see #getData() 1024 */ 1025public void setData (Object data) { 1026    checkWidget(); 1027    if ((state & KEYED_DATA) != 0) { 1028        ((Object []) this.data) [0] = data; 1029    } else { 1030        this.data = data; 1031    } 1032} 1033 1034/** 1035 * Sets the application defined property of the receiver 1036 * with the specified name to the given value. 1037 * <p> 1038 * Applications may associate arbitrary objects with the 1039 * receiver in this fashion. If the objects stored in the 1040 * properties need to be notified when the widget is disposed 1041 * of, it is the application's responsibility to hook the 1042 * Dispose event on the widget and do so. 1043 * </p> 1044 * 1045 * @param key the name of the property 1046 * @param value the new value for the property 1047 * 1048 * @exception IllegalArgumentException <ul> 1049 * <li>ERROR_NULL_ARGUMENT - if the key is null</li> 1050 * </ul> 1051 * @exception SWTException <ul> 1052 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> 1053 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> 1054 * </ul> 1055 * 1056 * @see #getData(String) 1057 */ 1058public void setData (String key, Object value) { 1059    checkWidget(); 1060    if (key == null) error (SWT.ERROR_NULL_ARGUMENT); 1061    int index = 1; 1062    Object [] table = null; 1063    if ((state & KEYED_DATA) != 0) { 1064        table = (Object []) data; 1065        while (index < table.length) { 1066            if (key.equals (table [index])) break; 1067            index += 2; 1068        } 1069    } 1070    if (value != null) { 1071        if ((state & KEYED_DATA) != 0) { 1072            if (index == table.length) { 1073                Object [] newTable = new Object [table.length + 2]; 1074                System.arraycopy (table, 0, newTable, 0, table.length); 1075                data = table = newTable; 1076            } 1077        } else { 1078            table = new Object [3]; 1079            table [0] = data; 1080            data = table; 1081            state |= KEYED_DATA; 1082        } 1083        table [index] = key; 1084        table [index + 1] = value; 1085    } else { 1086        if ((state & KEYED_DATA) != 0) { 1087            if (index != table.length) { 1088                int length = table.length - 2; 1089                if (length == 1) { 1090                    data = table [0]; 1091                    state &= ~KEYED_DATA; 1092                } else { 1093                    Object [] newTable = new Object [length]; 1094                    System.arraycopy (table, 0, newTable, 0, index); 1095                    System.arraycopy (table, index + 2, newTable, index, length - index); 1096                    data = newTable; 1097                } 1098            } 1099        } 1100    } 1101} 1102 1103boolean sendFocusEvent (int type) { 1104    sendEvent (type); 1105    // widget could be disposed at this point 1106 return true; 1107} 1108 1109boolean setInputState (Event event, int type) { 1110    if (OS.GetKeyState (OS.VK_MENU) < 0) event.stateMask |= SWT.ALT; 1111    if (OS.GetKeyState (OS.VK_SHIFT) < 0) event.stateMask |= SWT.SHIFT; 1112    if (OS.GetKeyState (OS.VK_CONTROL) < 0) event.stateMask |= SWT.CONTROL; 1113    if (OS.GetKeyState (OS.VK_LBUTTON) < 0) event.stateMask |= SWT.BUTTON1; 1114    if (OS.GetKeyState (OS.VK_MBUTTON) < 0) event.stateMask |= SWT.BUTTON2; 1115    if (OS.GetKeyState (OS.VK_RBUTTON) < 0) event.stateMask |= SWT.BUTTON3; 1116    if (OS.GetKeyState (OS.VK_XBUTTON1) < 0) event.stateMask |= SWT.BUTTON4; 1117    if (OS.GetKeyState (OS.VK_XBUTTON2) < 0) event.stateMask |= SWT.BUTTON5; 1118    switch (type) { 1119        case SWT.MouseDown: 1120        case SWT.MouseDoubleClick: 1121            if (event.button == 1) event.stateMask &= ~SWT.BUTTON1; 1122            if (event.button == 2) event.stateMask &= ~SWT.BUTTON2; 1123            if (event.button == 3) event.stateMask &= ~SWT.BUTTON3; 1124            if (event.button == 4) event.stateMask &= ~SWT.BUTTON4; 1125            if (event.button == 5) event.stateMask &= ~SWT.BUTTON5; 1126            break; 1127        case SWT.MouseUp: 1128            if (event.button == 1) event.stateMask |= SWT.BUTTON1; 1129            if (event.button == 2) event.stateMask |= SWT.BUTTON2; 1130            if (event.button == 3) event.stateMask |= SWT.BUTTON3; 1131            if (event.button == 4) event.stateMask |= SWT.BUTTON4; 1132            if (event.button == 5) event.stateMask |= SWT.BUTTON5; 1133            break; 1134        case SWT.KeyDown: 1135        case SWT.Traverse: 1136            if (event.keyCode == SWT.ALT) event.stateMask &= ~SWT.ALT; 1137            if (event.keyCode == SWT.SHIFT) event.stateMask &= ~SWT.SHIFT; 1138            if (event.keyCode == SWT.CONTROL) event.stateMask &= ~SWT.CONTROL; 1139            break; 1140        case SWT.KeyUp: 1141            if (event.keyCode == SWT.ALT) event.stateMask |= SWT.ALT; 1142            if (event.keyCode == SWT.SHIFT) event.stateMask |= SWT.SHIFT; 1143            if (event.keyCode == SWT.CONTROL) event.stateMask |= SWT.CONTROL; 1144            break; 1145    } 1146    return true; 1147} 1148 1149boolean setKeyState (Event event, int type, int wParam, int lParam) { 1150     1151    /* 1152    * Feature in Windows. When the user presses Ctrl+Backspace 1153    * or Ctrl+Enter, Windows sends a WM_CHAR with Delete (0x7F) 1154    * and '\n' instead of '\b' and '\r'. This is the correct 1155    * platform behavior but is not portable. The fix is to detect 1156    * these cases and convert the character. 1157    */ 1158    switch (display.lastAscii) { 1159        case SWT.DEL: 1160            if (display.lastKey == SWT.BS) display.lastAscii = SWT.BS; 1161            break; 1162        case SWT.LF: 1163            if (display.lastKey == SWT.CR) display.lastAscii = SWT.CR; 1164            break; 1165    } 1166     1167    /* 1168    * Feature in Windows. When the user presses either the Enter 1169    * key or the numeric keypad Enter key, Windows sends a WM_KEYDOWN 1170    * with wParam=VK_RETURN in both cases. In order to distinguish 1171    * between the keys, the extended key bit is tested. If the bit 1172    * is set, assume that the numeric keypad Enter was pressed. 1173    */ 1174    if (display.lastKey == SWT.CR && display.lastAscii == SWT.CR) { 1175        if ((lParam & 0x1000000) != 0) display.lastKey = SWT.KEYPAD_CR; 1176    } 1177     1178    if (display.lastVirtual) { 1179        /* 1180        * Feature in Windows. The virtual key VK_DELETE is not 1181        * treated as both a virtual key and an ASCII key by Windows. 1182        * Therefore, we will not receive a WM_CHAR for this key. 1183        * The fix is to treat VK_DELETE as a special case and map 1184        * the ASCII value explicitly (Delete is 0x7F). 1185        */ 1186        if (display.lastKey == OS.VK_DELETE) display.lastAscii = 0x7F; 1187         1188        /* 1189        * Feature in Windows. When the user presses Ctrl+Pause, the 1190        * VK_CANCEL key is generated and a WM_CHAR is sent with 0x03, 1191        * possibly to allow an application to look for Ctrl+C and the 1192        * the Break key at the same time. This is unexpected and 1193        * unwanted. The fix is to detect the case and set the character 1194        * to zero. 1195        */ 1196        if (display.lastKey == OS.VK_CANCEL) display.lastAscii = 0x0; 1197         1198        event.keyCode = Display.translateKey (display.lastKey); 1199    } else { 1200        event.keyCode = display.lastKey; 1201    } 1202    if (display.lastAscii != 0 || display.lastNull) { 1203        event.character = Display.mbcsToWcs ((char) display.lastAscii); 1204    } 1205    if (event.keyCode == 0 && event.character == 0) { 1206        if (!display.lastNull) return false; 1207    } 1208    return setInputState (event, type); 1209} 1210 1211boolean SetWindowPos (int hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags) { 1212    if (OS.IsWinCE) { 1213        /* 1214        * Feature in Windows. On Windows CE, SetWindowPos() always causes 1215        * a WM_SIZE message, even when the new size is the same as the old 1216        * size. The fix is to detect that the size has not changed and set 1217        * SWP_NOSIZE. 1218        */ 1219        if ((uFlags & OS.SWP_NOSIZE) == 0) { 1220            RECT lpRect = new RECT (); 1221            OS.GetWindowRect (hWnd, lpRect); 1222            if (cy == lpRect.bottom - lpRect.top && cx == lpRect.right - lpRect.left) { 1223                /* 1224                * Feature in Windows. On Windows CE, SetWindowPos() when called 1225                * with SWP_DRAWFRAME always causes a WM_SIZE message, even 1226                * when SWP_NOSIZE is set and when the new size is the same as the 1227                * old size. The fix is to clear SWP_DRAWFRAME when the size is 1228                * the same. 1229                */ 1230                uFlags &= ~OS.SWP_DRAWFRAME; 1231                uFlags |= OS.SWP_NOSIZE; 1232            } 1233        } 1234    } 1235    return OS.SetWindowPos (hWnd, hWndInsertAfter, X, Y, cx, cy, uFlags); 1236} 1237 1238boolean showMenu (int x, int y) { 1239    Event event = new Event (); 1240    event.x = x; 1241    event.y = y; 1242    sendEvent (SWT.MenuDetect, event); 1243    if (!event.doit) return true; 1244    Menu menu = getMenu (); 1245    if (menu != null && !menu.isDisposed ()) { 1246        if (x != event.x || y != event.y) { 1247            menu.setLocation (event.x, event.y); 1248        } 1249        menu.setVisible (true); 1250        return true; 1251    } 1252    return false; 1253} 1254 1255/** 1256 * Returns a string containing a concise, human-readable 1257 * description of the receiver. 1258 * 1259 * @return a string representation of the receiver 1260 */ 1261public String toString () { 1262    String string = "*Disposed*"; //$NON-NLS-1$ 1263 if (!isDisposed ()) { 1264        string = "*Wrong Thread*"; //$NON-NLS-1$ 1265 if (isValidThread ()) string = getNameText (); 1266    } 1267    return getName () + " {" + string + "}"; //$NON-NLS-1$ //$NON-NLS-2$ 1268} 1269 1270LRESULT wmCaptureChanged (int hwnd, int wParam, int lParam) { 1271    display.captureChanged = true; 1272    return null; 1273} 1274 1275LRESULT wmChar (int hwnd, int wParam, int lParam) { 1276    /* 1277    * Do not report a lead byte as a key pressed. 1278    */ 1279    if (!OS.IsUnicode && OS.IsDBLocale) { 1280        byte lead = (byte) (wParam & 0xFF); 1281        if (OS.IsDBCSLeadByte (lead)) return null; 1282    } 1283    display.lastAscii = wParam; 1284    display.lastNull = wParam == 0; 1285    if (!sendKeyEvent (SWT.KeyDown, OS.WM_CHAR, wParam, lParam)) { 1286        return LRESULT.ONE; 1287    } 1288    // widget could be disposed at this point 1289 return null; 1290} 1291 1292LRESULT wmContextMenu (int hwnd, int wParam, int lParam) { 1293    if (wParam != hwnd) return null; 1294     1295    /* 1296    * Feature in Windows. SHRecognizeGesture() sends an undocumented 1297    * WM_CONTEXTMENU notification when the flag SHRG_NOTIFY_PARENT is 1298    * not set. This causes the context menu to be displayed twice, 1299    * once by the caller of SHRecognizeGesture() and once from this 1300    * method. The fix is to ignore WM_CONTEXTMENU notifications on 1301    * all WinCE platforms. 1302    * 1303    * NOTE: This only happens on WM2003. Previous WinCE versions did 1304    * not support WM_CONTEXTMENU. 1305    */ 1306    if (OS.IsWinCE) return null; 1307     1308    /* 1309    * Feature in Windows. When the user presses WM_NCRBUTTONUP, 1310    * a WM_CONTEXTMENU message is generated. This happens when 1311    * the user releases the mouse over a scroll bar. Normally, 1312    * window displays the default scrolling menu but applications 1313    * can process WM_CONTEXTMENU to display a different menu. 1314    * Typically, an application does not want to supply a special 1315    * scroll menu. The fix is to look for a WM_CONTEXTMENU that 1316    * originated from a mouse event and display the menu when the 1317    * mouse was released in the client area. 1318    */ 1319    int x = 0, y = 0; 1320    if (lParam != -1) { 1321        POINT pt = new POINT (); 1322        x = pt.x = (short) (lParam & 0xFFFF); 1323        y = pt.y = (short) (lParam >> 16); 1324        OS.ScreenToClient (hwnd, pt); 1325        RECT rect = new RECT (); 1326        OS.GetClientRect (hwnd, rect); 1327        if (!OS.PtInRect (rect, pt)) return null; 1328    } else { 1329        int pos = OS.GetMessagePos (); 1330        x = (short) (pos & 0xFFFF); 1331        y = (short) (pos >> 16); 1332    } 1333 1334    /* Show the menu */ 1335    return showMenu (x, y) ? LRESULT.ZERO : null; 1336} 1337 1338LRESULT wmIMEChar (int hwnd, int wParam, int lParam) { 1339    Display display = this.display; 1340    display.lastKey = 0; 1341    display.lastAscii = wParam; 1342    display.lastVirtual = display.lastNull = display.lastDead = false; 1343    if (!sendKeyEvent (SWT.KeyDown, OS.WM_IME_CHAR, wParam, lParam)) { 1344        return LRESULT.ONE; 1345    } 1346    sendKeyEvent (SWT.KeyUp, OS.WM_IME_CHAR, wParam, lParam); 1347    // widget could be disposed at this point 1348 display.lastKey = display.lastAscii = 0; 1349    return LRESULT.ONE; 1350} 1351 1352LRESULT wmKeyDown (int hwnd, int wParam, int lParam) { 1353     1354    /* Ignore repeating modifier keys by testing key down state */ 1355    switch (wParam) { 1356        case OS.VK_SHIFT: 1357        case OS.VK_MENU: 1358        case OS.VK_CONTROL: 1359        case OS.VK_CAPITAL: 1360        case OS.VK_NUMLOCK: 1361        case OS.VK_SCROLL: 1362            if ((lParam & 0x40000000) != 0) return null; 1363    } 1364     1365    /* Clear last key and last ascii because a new key has been typed */ 1366    display.lastAscii = display.lastKey = 0; 1367    display.lastVirtual = display.lastNull = display.lastDead = false; 1368     1369    /* 1370    * Do not report a lead byte as a key pressed. 1371    */ 1372    if (!OS.IsUnicode && OS.IsDBLocale) { 1373        byte lead = (byte) (wParam & 0xFF); 1374        if (OS.IsDBCSLeadByte (lead)) return null; 1375    } 1376     1377    /* Map the virtual key */ 1378    /* 1379    * Bug in WinCE. MapVirtualKey() returns incorrect values. 1380    * The fix is to rely on a key mappings table to determine 1381    * whether the key event must be sent now or if a WM_CHAR 1382    * event will follow. The key mappings table maps virtual 1383    * keys to SWT key codes and does not contain mappings for 1384    * Windows virtual keys like VK_A. Virtual keys that are 1385    * both virtual and ASCII are a special case. 1386    */ 1387    int mapKey = 0; 1388    if (OS.IsWinCE) { 1389        switch (wParam) { 1390            case OS.VK_BACK: mapKey = SWT.BS; break; 1391            case OS.VK_RETURN: mapKey = SWT.CR; break; 1392            case OS.VK_DELETE: mapKey = SWT.DEL; break; 1393            case OS.VK_ESCAPE: mapKey = SWT.ESC; break; 1394            case OS.VK_TAB: mapKey = SWT.TAB; break; 1395        } 1396    } else { 1397        mapKey = OS.MapVirtualKey (wParam, 2); 1398    } 1399 1400    /* 1401    * Bug in Windows 95 and NT. When the user types an accent key such 1402    * as ^ to get an accented character on a German keyboard, the accent 1403    * key should be ignored and the next key that the user types is the 1404    * accented key. The fix is to detect the accent key stroke (called 1405    * a dead key) by testing the high bit of the value returned by 1406    * MapVirtualKey(). A further problem is that the high bit on 1407    * Windows NT is bit 32 while the high bit on Windows 95 is bit 16. 1408    * They should both be bit 32. 1409    * 1410    * When the user types an accent key that does not correspond to a 1411    * virtual key, MapVirtualKey() won't set the high bit to indicate 1412    * a dead key. This happens when an accent key, such as '^' is the 1413    * result of a modifier such as Shift key and MapVirtualKey() always 1414    * returns the unshifted key. The fix is to peek for a WM_DEADCHAR 1415    * and avoid issuing the event. 1416    */ 1417    if (OS.IsWinNT) { 1418        if ((mapKey & 0x80000000) != 0) return null; 1419    } else { 1420        if ((mapKey & 0x8000) != 0) return null; 1421    } 1422    MSG msg = new MSG (); 1423    int flags = OS.PM_NOREMOVE | OS.PM_NOYIELD | OS.PM_QS_INPUT | OS.PM_QS_POSTMESSAGE; 1424    if (OS.PeekMessage (msg, hwnd, OS.WM_DEADCHAR, OS.WM_DEADCHAR, flags)) { 1425        display.lastDead = true; 1426        display.lastVirtual = mapKey == 0; 1427        display.lastKey = display.lastVirtual ? wParam : mapKey; 1428        return null; 1429    } 1430     1431    /* 1432    * Bug in Windows. Somehow, the widget is becoming disposed after 1433    * calling PeekMessage(). In rare circumstances, it seems that 1434    * PeekMessage() can allow SWT listeners to run that might contain 1435    * application code that disposes the widget. It is not exactly 1436    * clear how this can happen. PeekMessage() is only looking for 1437    * WM_DEADCHAR. It is not dispatching any message that it finds 1438    * or removing any message from the queue. Cross-thread messages 1439    * are disabled. The fix is to check for a disposed widget and 1440    * return without calling the window proc. 1441    */ 1442    if (isDisposed ()) return LRESULT.ONE; 1443     1444    /* 1445    * If we are going to get a WM_CHAR, ensure that last key has 1446    * the correct character value for the key down and key up 1447    * events. It is not sufficient to ignore the WM_KEYDOWN 1448    * (when we know we are going to get a WM_CHAR) and compute 1449    * the key in WM_CHAR because there is not enough information 1450    * by the time we get the WM_CHAR. For example, when the user 1451    * types Ctrl+Shift+6 on a US keyboard, we get a WM_CHAR with 1452    * wParam=30. When the user types Ctrl+Shift+6 on a German 1453    * keyboard, we also get a WM_CHAR with wParam=30. On the US 1454    * keyboard Shift+6 is ^, on the German keyboard Shift+6 is &. 1455    * There is no way to map wParam=30 in WM_CHAR to the correct 1456    * value. Also, on international keyboards, the control key 1457    * may be down when the user has not entered a control character. 1458    * 1459    * NOTE: On Windows 98, keypad keys are virtual despite the 1460    * fact that a WM_CHAR is issued. On Windows 2000 and XP, 1461    * they are not virtual. Therefore it is necessary to force 1462    * numeric keypad keys to be virtual. 1463    */ 1464    display.lastVirtual = mapKey == 0 || display.numpadKey (wParam) != 0; 1465    if (display.lastVirtual) { 1466        display.lastKey = wParam; 1467        /* 1468        * Feature in Windows. The virtual key VK_DELETE is not 1469        * treated as both a virtual key and an ASCII key by Windows. 1470        * Therefore, we will not receive a WM_CHAR for this key. 1471        * The fix is to treat VK_DELETE as a special case and map 1472        * the ASCII value explicitly (Delete is 0x7F). 1473        */ 1474        if (display.lastKey == OS.VK_DELETE) display.lastAscii = 0x7F; 1475 1476        /* 1477        * It is possible to get a WM_CHAR for a virtual key when 1478        * Num Lock is on. If the user types Home while Num Lock 1479        * is down, a WM_CHAR is issued with WPARM=55 (for the 1480        * character 7). If we are going to get a WM_CHAR we need 1481        * to ensure that the last key has the correct value. Note 1482        * that Ctrl+Home does not issue a WM_CHAR when Num Lock is 1483        * down. 1484        */ 1485        if (OS.VK_NUMPAD0 <= display.lastKey && display.lastKey <= OS.VK_DIVIDE) { 1486            /* 1487            * Feature in Windows. Calling to ToAscii() or ToUnicode(), clears 1488            * the accented state such that the next WM_CHAR loses the accent. 1489            * This makes is critical that the accent key is detected. Also, 1490            * these functions clear the character that is entered using the 1491            * special Windows keypad sequence when NumLock is down (ie. typing 1492            * ALT+0231 should gives 'c' with a cedilla when NumLock is down). 1493            */ 1494            if (display.asciiKey (display.lastKey) != 0) return null; 1495            display.lastAscii = display.numpadKey (display.lastKey); 1496        } 1497    } else { 1498        /* 1499        * Convert LastKey to lower case because Windows non-virtual 1500        * keys that are also ASCII keys, such as like VK_A, are have 1501        * upper case values in WM_KEYDOWN despite the fact that the 1502        * Shift was not pressed. 1503        */ 1504        display.lastKey = OS.CharLower ((short) mapKey); 1505 1506        /* 1507        * Feature in Windows. The virtual key VK_CANCEL is treated 1508        * as both a virtual key and ASCII key by Windows. This 1509        * means that a WM_CHAR with WPARAM=3 will be issued for 1510        * this key. In order to distinguish between this key and 1511        * Ctrl+C, mark the key as virtual. 1512        */ 1513        if (wParam == OS.VK_CANCEL) display.lastVirtual = true; 1514         1515        /* 1516        * Some key combinations map to Windows ASCII keys depending 1517        * on the keyboard. For example, Ctrl+Alt+Q maps to @ on a 1518        * German keyboard. If the current key combination is special, 1519        * the correct character is placed in wParam for processing in 1520        * WM_CHAR. If this is the case, issue the key down event from 1521        * inside WM_CHAR. 1522        */ 1523        int asciiKey = display.asciiKey (wParam); 1524        if (asciiKey != 0) { 1525            /* 1526            * When the user types Ctrl+Space, ToAscii () maps this to 1527            * Space. Normally, ToAscii () maps a key to a different 1528            * key if both a WM_KEYDOWN and a WM_CHAR will be issued. 1529            * To avoid the extra SWT.KeyDown, look for a space and 1530            * issue the event from WM_CHAR. 1531            */ 1532            if (asciiKey == ' ') return null; 1533            if (asciiKey != wParam) return null; 1534            /* 1535            * Feature in Windows. The virtual key VK_CANCEL is treated 1536            * as both a virtual key and ASCII key by Windows. This 1537            * means that a WM_CHAR with WPARAM=3 will be issued for 1538            * this key. To avoid the extra SWT.KeyDown, look for 1539            * VK_CANCEL and issue the event from WM_CHAR. 1540            */ 1541            if (wParam == OS.VK_CANCEL) return null; 1542        } 1543         1544        /* 1545        * If the control key is not down at this point, then 1546        * the key that was pressed was an accent key or a regular 1547        * key such as 'A' or Shift+A. In that case, issue the 1548        * key event from WM_CHAR. 1549        */ 1550        if (OS.GetKeyState (OS.VK_CONTROL) >= 0) return null; 1551         1552        /* 1553        * Get the shifted state or convert to lower case if necessary. 1554        * If the user types Ctrl+A, LastAscii should be 'a', not 'A'. 1555        * If the user types Ctrl+Shift+A, LastAscii should be 'A'. 1556        * If the user types Ctrl+Shift+6, the value of LastAscii will 1557        * depend on the international keyboard. 1558        */ 1559        if (OS.GetKeyState (OS.VK_SHIFT) < 0) { 1560            display.lastAscii = display.shiftedKey (wParam); 1561            if (display.lastAscii == 0) display.lastAscii = mapKey; 1562        } else { 1563            display.lastAscii = OS.CharLower ((short) mapKey); 1564        } 1565                 1566        /* Note that Ctrl+'@' is ASCII NUL and is delivered in WM_CHAR */ 1567        if (display.lastAscii == '@') return null; 1568        display.lastAscii = display.controlKey (display.lastAscii); 1569    } 1570    if (!sendKeyEvent (SWT.KeyDown, OS.WM_KEYDOWN, wParam, lParam)) { 1571        return LRESULT.ONE; 1572    } 1573    // widget could be disposed at this point 1574 return null; 1575} 1576 1577LRESULT wmKeyUp (int hwnd, int wParam, int lParam) { 1578    Display display = this.display; 1579     1580    /* Check for hardware keys */ 1581    if (OS.IsWinCE) { 1582        if (OS.VK_APP1 <= wParam && wParam <= OS.VK_APP6) { 1583            display.lastKey = display.lastAscii = 0; 1584            display.lastVirtual = display.lastNull = display.lastDead = false; 1585            Event event = new Event (); 1586            event.detail = wParam - OS.VK_APP1 + 1; 1587            /* Check the bit 30 to get the key state */ 1588            int type = (lParam & 0x40000000) != 0 ? SWT.HardKeyUp : SWT.HardKeyDown; 1589            if (setInputState (event, type)) sendEvent (type, event); 1590            // widget could be disposed at this point 1591 return null; 1592        } 1593    } 1594     1595    /* 1596    * If the key up is not hooked, reset last key 1597    * and last ascii in case the key down is hooked. 1598    */ 1599    if (!hooks (SWT.KeyUp) && !display.filters (SWT.KeyUp)) { 1600        display.lastKey = display.lastAscii = 0; 1601        display.lastVirtual = display.lastNull = display.lastDead = false; 1602        return null; 1603    } 1604     1605    /* Map the virtual key. */ 1606    /* 1607    * Bug in WinCE. MapVirtualKey() returns incorrect values. 1608    * The fix is to rely on a key mappings table to determine 1609    * whether the key event must be sent now or if a WM_CHAR 1610    * event will follow. The key mappings table maps virtual 1611    * keys to SWT key codes and does not contain mappings for 1612    * Windows virtual keys like VK_A. Virtual keys that are 1613    * both virtual and ASCII are a special case. 1614    */ 1615    int mapKey = 0; 1616    if (OS.IsWinCE) { 1617        switch (wParam) { 1618            case OS.VK_BACK: mapKey = SWT.BS; break; 1619            case OS.VK_RETURN: mapKey = SWT.CR; break; 1620            case OS.VK_DELETE: mapKey = SWT.DEL; break; 1621            case OS.VK_ESCAPE: mapKey = SWT.ESC; break; 1622            case OS.VK_TAB: mapKey = SWT.TAB; break; 1623        } 1624    } else { 1625        mapKey = OS.MapVirtualKey (wParam, 2); 1626    } 1627 1628    /* 1629    * Bug in Windows 95 and NT. When the user types an accent key such 1630    * as ^ to get an accented character on a German keyboard, the accent 1631    * key should be ignored and the next key that the user types is the 1632    * accented key. The fix is to detect the accent key stroke (called 1633    * a dead key) by testing the high bit of the value returned by 1634    * MapVirtualKey (). A further problem is that the high bit on 1635    * Windows NT is bit 32 while the high bit on Windows 95 is bit 16. 1636    * They should both be bit 32. 1637    */ 1638    if (OS.IsWinNT) { 1639        if ((mapKey & 0x80000000) != 0) return null; 1640    } else { 1641        if ((mapKey & 0x8000) != 0) return null; 1642    } 1643    if (display.lastDead) return null; 1644 1645    /* 1646    * NOTE: On Windows 98, keypad keys are virtual despite the 1647    * fact that a WM_CHAR is issued. On Windows 2000 and XP, 1648    * they are not virtual. Therefore it is necessary to force 1649    * numeric keypad keys to be virtual. 1650    */ 1651    display.lastVirtual = mapKey == 0 || display.numpadKey (wParam) != 0; 1652    if (display.lastVirtual) { 1653        display.lastKey = wParam; 1654    } else { 1655        /* 1656        * Feature in Windows. The virtual key VK_CANCEL is treated 1657        * as both a virtual key and ASCII key by Windows. This 1658        * means that a WM_CHAR with WPARAM=3 will be issued for 1659        * this key. In order to distinguish between this key and 1660        * Ctrl+C, mark the key as virtual. 1661        */ 1662        if (wParam == OS.VK_CANCEL) display.lastVirtual = true; 1663        if (display.lastKey == 0) { 1664            display.lastAscii = 0; 1665            display.lastNull = display.lastDead = false; 1666            return null; 1667        } 1668    } 1669    LRESULT result = null; 1670    if (!sendKeyEvent (SWT.KeyUp, OS.WM_KEYUP, wParam, lParam)) { 1671        result = LRESULT.ONE; 1672    } 1673    // widget could be disposed at this point 1674 display.lastKey = display.lastAscii = 0; 1675    display.lastVirtual = display.lastNull = display.lastDead = false; 1676    return result; 1677} 1678 1679LRESULT wmKillFocus (int hwnd, int wParam, int lParam) { 1680    int code = callWindowProc (hwnd, OS.WM_KILLFOCUS, wParam, lParam); 1681    sendFocusEvent (SWT.FocusOut); 1682    // widget could be disposed at this point 1683 1684    /* 1685    * It is possible (but unlikely), that application 1686    * code could have disposed the widget in the focus 1687    * or deactivate events. If this happens, end the 1688    * processing of the Windows message by returning 1689    * zero as the result of the window proc. 1690    */ 1691    if (isDisposed ()) return LRESULT.ZERO; 1692    if (code == 0) return LRESULT.ZERO; 1693    return new LRESULT (code); 1694} 1695 1696LRESULT wmLButtonDblClk (int hwnd, int wParam, int lParam) { 1697    /* 1698    * Feature in Windows. Windows sends the following 1699    * messages when the user double clicks the mouse: 1700    * 1701    * WM_LBUTTONDOWN - mouse down 1702    * WM_LBUTTONUP - mouse up 1703    * WM_LBUTTONDBLCLK - double click 1704    * WM_LBUTTONUP - mouse up 1705    * 1706    * Applications that expect matching mouse down/up 1707    * pairs will not see the second mouse down. The 1708    * fix is to send a mouse down event. 1709    */ 1710    LRESULT result = null; 1711    Display display = this.display; 1712    display.captureChanged = false; 1713    sendMouseEvent (SWT.MouseDown, 1, hwnd, OS.WM_LBUTTONDOWN, wParam, lParam); 1714    if (sendMouseEvent (SWT.MouseDoubleClick, 1, hwnd, OS.WM_LBUTTONDBLCLK, wParam, lParam)) { 1715        result = new LRESULT (callWindowProc (hwnd, OS.WM_LBUTTONDBLCLK, wParam, lParam)); 1716    } else { 1717        result = LRESULT.ZERO; 1718    } 1719    if (!display.captureChanged && !isDisposed ()) { 1720        if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 1721    } 1722    return result; 1723} 1724 1725LRESULT wmLButtonDown (int hwnd, int wParam, int lParam) { 1726    Display display = this.display; 1727    LRESULT result = null; 1728    int x = (short) (lParam & 0xFFFF); 1729    int y = (short) (lParam >> 16); 1730    boolean [] consume = null, detect = null; 1731    boolean dragging = false, mouseDown = true; 1732    int count = display.getClickCount (SWT.MouseDown, 1, hwnd, lParam); 1733    if (count == 1 && (state & DRAG_DETECT) != 0 && hooks (SWT.DragDetect)) { 1734        if (!OS.IsWinCE) { 1735            /* 1736            * Feature in Windows. It's possible that the drag 1737            * operation will not be started while the mouse is 1738            * down, meaning that the mouse should be captured. 1739            * This can happen when the user types the ESC key 1740            * to cancel the drag. The fix is to query the state 1741            * of the mouse and capture the mouse accordingly. 1742            */ 1743            detect = new boolean [1]; 1744            consume = new boolean [1]; 1745            dragging = dragDetect (hwnd, x, y, true, detect, consume); 1746            if (isDisposed ()) return LRESULT.ZERO; 1747            mouseDown = OS.GetKeyState (OS.VK_LBUTTON) < 0; 1748        } 1749    } 1750    display.captureChanged = false; 1751    boolean dispatch = sendMouseEvent (SWT.MouseDown, 1, count, 0, false, hwnd, OS.WM_LBUTTONDOWN, wParam, lParam); 1752    if (dispatch && (consume == null || !consume [0])) { 1753        result = new LRESULT (callWindowProc (hwnd, OS.WM_LBUTTONDOWN, wParam, lParam)); 1754    } else { 1755        result = LRESULT.ZERO; 1756    } 1757    if (OS.IsPPC) { 1758        /* 1759        * Note: On WinCE PPC, only attempt to recognize the gesture for 1760        * a context menu when the control contains a valid menu or there 1761        * are listeners for the MenuDetect event. 1762        */ 1763        Menu menu = getMenu (); 1764        boolean hasMenu = menu != null && !menu.isDisposed (); 1765        if (hasMenu || hooks (SWT.MenuDetect)) { 1766            SHRGINFO shrg = new SHRGINFO (); 1767            shrg.cbSize = SHRGINFO.sizeof; 1768            shrg.hwndClient = hwnd; 1769            shrg.ptDown_x = x; 1770            shrg.ptDown_y = y; 1771            shrg.dwFlags = OS.SHRG_RETURNCMD; 1772            int type = OS.SHRecognizeGesture (shrg); 1773            if (type == OS.GN_CONTEXTMENU) showMenu (x, y); 1774        } 1775    } 1776    if (mouseDown) { 1777        if (!display.captureChanged && !isDisposed ()) { 1778            if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 1779        } 1780    } 1781    if (dragging) { 1782        sendDragEvent (1, x, y); 1783    } else { 1784        if (detect != null && detect [0]) { 1785            /* 1786            * Feature in Windows. DragDetect() captures the mouse 1787            * and tracks its movement until the user releases the 1788            * left mouse button, presses the ESC key, or moves the 1789            * mouse outside the drag rectangle. If the user moves 1790            * the mouse outside of the drag rectangle, DragDetect() 1791            * returns true and a drag and drop operation can be 1792            * started. When the left mouse button is released or 1793            * the ESC key is pressed, these events are consumed by 1794            * DragDetect() so that application code that matches 1795            * mouse down/up pairs or looks for the ESC key will not 1796            * function properly. The fix is to send the missing 1797            * events when the drag has not started. 1798            * 1799            * NOTE: For now, don't send a fake WM_KEYDOWN/WM_KEYUP 1800            * events for the ESC key. This would require computing 1801            * wParam (the key) and lParam (the repeat count, scan code, 1802            * extended-key flag, context code, previous key-state flag, 1803            * and transition-state flag) which is non-trivial. 1804            */ 1805            if (OS.GetKeyState (OS.VK_ESCAPE) >= 0) { 1806                OS.SendMessage (hwnd, OS.WM_LBUTTONUP, wParam, lParam); 1807            } 1808        } 1809    } 1810    return result; 1811} 1812 1813LRESULT wmLButtonUp (int hwnd, int wParam, int lParam) { 1814    Display display = this.display; 1815    LRESULT result = null; 1816    if (sendMouseEvent (SWT.MouseUp, 1, hwnd, OS.WM_LBUTTONUP, wParam, lParam)) { 1817        result = new LRESULT (callWindowProc (hwnd, OS.WM_LBUTTONUP, wParam, lParam)); 1818    } else { 1819        result = LRESULT.ZERO; 1820    } 1821    /* 1822    * Bug in Windows. On some machines that do not have XBUTTONs, 1823    * the MK_XBUTTON1 and OS.MK_XBUTTON2 bits are sometimes set, 1824    * causing mouse capture to become stuck. The fix is to test 1825    * for the extra buttons only when they exist. 1826    */ 1827    int mask = OS.MK_LBUTTON | OS.MK_MBUTTON | OS.MK_RBUTTON; 1828    if (display.xMouse) mask |= OS.MK_XBUTTON1 | OS.MK_XBUTTON2; 1829    if (((wParam & 0xFFFF) & mask) == 0) { 1830        if (OS.GetCapture () == hwnd) OS.ReleaseCapture (); 1831    } 1832    return result; 1833} 1834 1835LRESULT wmMButtonDblClk (int hwnd, int wParam, int lParam) { 1836    /* 1837    * Feature in Windows. Windows sends the following 1838    * messages when the user double clicks the mouse: 1839    * 1840    * WM_MBUTTONDOWN - mouse down 1841    * WM_MBUTTONUP - mouse up 1842    * WM_MLBUTTONDBLCLK - double click 1843    * WM_MBUTTONUP - mouse up 1844    * 1845    * Applications that expect matching mouse down/up 1846    * pairs will not see the second mouse down. The 1847    * fix is to send a mouse down event. 1848    */ 1849    LRESULT result = null; 1850    Display display = this.display; 1851    display.captureChanged = false; 1852    sendMouseEvent (SWT.MouseDown, 2, hwnd, OS.WM_MBUTTONDOWN, wParam, lParam); 1853    if (sendMouseEvent (SWT.MouseDoubleClick, 2, hwnd, OS.WM_MBUTTONDBLCLK, wParam, lParam)) { 1854        result = new LRESULT (callWindowProc (hwnd, OS.WM_MBUTTONDBLCLK, wParam, lParam)); 1855    } else { 1856        result = LRESULT.ZERO; 1857    } 1858    if (!display.captureChanged && !isDisposed ()) { 1859        if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 1860    } 1861    return result; 1862} 1863 1864LRESULT wmMButtonDown (int hwnd, int wParam, int lParam) { 1865    LRESULT result = null; 1866    Display display = this.display; 1867    display.captureChanged = false; 1868    if (sendMouseEvent (SWT.MouseDown, 2, hwnd, OS.WM_MBUTTONDOWN, wParam, lParam)) { 1869        result = new LRESULT (callWindowProc (hwnd, OS.WM_MBUTTONDOWN, wParam, lParam)); 1870    } else { 1871        result = LRESULT.ZERO; 1872    } 1873    if (!display.captureChanged && !isDisposed ()) { 1874        if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 1875    } 1876    return result; 1877} 1878 1879LRESULT wmMButtonUp (int hwnd, int wParam, int lParam) { 1880    Display display = this.display; 1881    LRESULT result = null; 1882    if (sendMouseEvent (SWT.MouseUp, 2, hwnd, OS.WM_MBUTTONUP, wParam, lParam)) { 1883        result = new LRESULT (callWindowProc (hwnd, OS.WM_MBUTTONUP, wParam, lParam)); 1884    } else { 1885        result = LRESULT.ZERO; 1886    } 1887    /* 1888    * Bug in Windows. On some machines that do not have XBUTTONs, 1889    * the MK_XBUTTON1 and OS.MK_XBUTTON2 bits are sometimes set, 1890    * causing mouse capture to become stuck. The fix is to test 1891    * for the extra buttons only when they exist. 1892    */ 1893    int mask = OS.MK_LBUTTON | OS.MK_MBUTTON | OS.MK_RBUTTON; 1894    if (display.xMouse) mask |= OS.MK_XBUTTON1 | OS.MK_XBUTTON2; 1895    if (((wParam & 0xFFFF) & mask) == 0) { 1896        if (OS.GetCapture () == hwnd) OS.ReleaseCapture (); 1897    } 1898    return result; 1899} 1900 1901LRESULT wmMouseHover (int hwnd, int wParam, int lParam) { 1902    if (!sendMouseEvent (SWT.MouseHover, 0, hwnd, OS.WM_MOUSEHOVER, wParam, lParam)) { 1903        return LRESULT.ZERO; 1904    } 1905    return null; 1906} 1907 1908LRESULT wmMouseLeave (int hwnd, int wParam, int lParam) { 1909    if (!hooks (SWT.MouseExit) && !filters (SWT.MouseExit)) return null; 1910    int pos = OS.GetMessagePos (); 1911    POINT pt = new POINT (); 1912    pt.x = (short) (pos & 0xFFFF); 1913    pt.y = (short) (pos >> 16); 1914    OS.ScreenToClient (hwnd, pt); 1915    lParam = (pt.x & 0xFFFF) | ((pt.y << 16) & 0xFFFF0000); 1916    if (!sendMouseEvent (SWT.MouseExit, 0, hwnd, OS.WM_MOUSELEAVE, wParam, lParam)) { 1917        return LRESULT.ZERO; 1918    } 1919    return null; 1920} 1921 1922LRESULT wmMouseMove (int hwnd, int wParam, int lParam) { 1923    LRESULT result = null; 1924    Display display = this.display; 1925    int pos = OS.GetMessagePos (); 1926    if (pos != display.lastMouse || display.captureChanged) { 1927        if (!OS.IsWinCE) { 1928            boolean trackMouse = (state & TRACK_MOUSE) != 0; 1929            boolean mouseEnter = hooks (SWT.MouseEnter) || display.filters (SWT.MouseEnter); 1930            boolean mouseExit = hooks (SWT.MouseExit) || display.filters (SWT.MouseExit); 1931            boolean mouseHover = hooks (SWT.MouseHover) || display.filters (SWT.MouseHover); 1932            if (trackMouse || mouseEnter || mouseExit || mouseHover) { 1933                TRACKMOUSEEVENT lpEventTrack = new TRACKMOUSEEVENT (); 1934                lpEventTrack.cbSize = TRACKMOUSEEVENT.sizeof; 1935                lpEventTrack.dwFlags = OS.TME_QUERY; 1936                lpEventTrack.hwndTrack = hwnd; 1937                OS.TrackMouseEvent (lpEventTrack); 1938                if (lpEventTrack.dwFlags == 0) { 1939                    lpEventTrack.dwFlags = OS.TME_LEAVE | OS.TME_HOVER; 1940                    lpEventTrack.hwndTrack = hwnd; 1941                    OS.TrackMouseEvent (lpEventTrack); 1942                    if (mouseEnter) { 1943                        /* 1944                        * Force all outstanding WM_MOUSELEAVE messages to be dispatched before 1945                        * issuing a mouse enter. This causes mouse exit events to be processed 1946                        * before mouse enter events. Note that WM_MOUSELEAVE is posted to the 1947                        * event queue by TrackMouseEvent(). 1948                        */ 1949                        MSG msg = new MSG (); 1950                        int flags = OS.PM_REMOVE | OS.PM_NOYIELD | OS.PM_QS_INPUT | OS.PM_QS_POSTMESSAGE; 1951                        while (OS.PeekMessage (msg, 0, OS.WM_MOUSELEAVE, OS.WM_MOUSELEAVE, flags)) { 1952                            OS.TranslateMessage (msg); 1953                            OS.DispatchMessage (msg); 1954                        } 1955                        sendMouseEvent (SWT.MouseEnter, 0, hwnd, OS.WM_MOUSEMOVE, wParam, lParam); 1956                    } 1957                } else { 1958                    lpEventTrack.dwFlags = OS.TME_HOVER; 1959                    OS.TrackMouseEvent (lpEventTrack); 1960                } 1961            } 1962        } 1963        if (pos != display.lastMouse) { 1964            display.lastMouse = pos; 1965            if (!sendMouseEvent (SWT.MouseMove, 0, hwnd, OS.WM_MOUSEMOVE, wParam, lParam)) { 1966                result = LRESULT.ZERO; 1967            } 1968        } 1969    } 1970    display.captureChanged = false; 1971    return result; 1972} 1973 1974LRESULT wmMouseWheel (int hwnd, int wParam, int lParam) { 1975    if (!hooks (SWT.MouseWheel) && !filters (SWT.MouseWheel)) return null; 1976    int delta = wParam >> 16; 1977    int [] value = new int [1]; 1978    int count, detail; 1979    OS.SystemParametersInfo (OS.SPI_GETWHEELSCROLLLINES, 0, value, 0); 1980    if (value [0] == OS.WHEEL_PAGESCROLL) { 1981        detail = SWT.SCROLL_PAGE; 1982        count = delta / OS.WHEEL_DELTA; 1983    } else { 1984        detail = SWT.SCROLL_LINE; 1985        count = value [0] * delta / OS.WHEEL_DELTA; 1986    } 1987    POINT pt = new POINT (); 1988    pt.x = (short) (lParam & 0xFFFF); 1989    pt.y = (short) (lParam >> 16); 1990    OS.ScreenToClient (hwnd, pt); 1991    lParam = (pt.x & 0xFFFF) | ((pt.y << 16) & 0xFFFF0000); 1992    if (!sendMouseEvent (SWT.MouseWheel, 0, count, detail, true, hwnd, OS.WM_MOUSEWHEEL, wParam, lParam)) { 1993        return LRESULT.ZERO; 1994    } 1995    return null; 1996} 1997 1998LRESULT wmPaint (int hwnd, int wParam, int lParam) { 1999 2000    /* Exit early - don't draw the background */ 2001    if (!hooks (SWT.Paint) && !filters (SWT.Paint)) { 2002        return null; 2003    } 2004     2005    /* Issue a paint event */ 2006    int result = 0; 2007    if (OS.IsWinCE) { 2008        RECT rect = new RECT (); 2009        OS.GetUpdateRect (hwnd, rect, false); 2010        result = callWindowProc (hwnd, OS.WM_PAINT, wParam, lParam); 2011        /* 2012        * Bug in Windows. When InvalidateRgn(), InvalidateRect() 2013        * or RedrawWindow() with RDW_INVALIDATE is called from 2014        * within WM_PAINT to invalidate a region for a further 2015        * BeginPaint(), the caret is not properly erased causing 2016        * pixel corruption. The fix is to hide and show the 2017        * caret. 2018        */ 2019        OS.HideCaret (hwnd); 2020        OS.InvalidateRect (hwnd, rect, false); 2021        OS.ShowCaret (hwnd); 2022        PAINTSTRUCT ps = new PAINTSTRUCT (); 2023        GCData data = new GCData (); 2024        data.ps = ps; 2025        data.hwnd = hwnd; 2026        GC gc = new_GC (data); 2027        if (gc != null) { 2028            int width = ps.right - ps.left; 2029            int height = ps.bottom - ps.top; 2030            if (width != 0 && height != 0) { 2031                Event event = new Event (); 2032                event.gc = gc; 2033                event.x = ps.left; 2034                event.y = ps.top; 2035                event.width = width; 2036                event.height = height; 2037                sendEvent (SWT.Paint, event); 2038                // widget could be disposed at this point 2039 event.gc = null; 2040            } 2041            gc.dispose (); 2042        } 2043    } else { 2044        int rgn = OS.CreateRectRgn (0, 0, 0, 0); 2045        OS.GetUpdateRgn (hwnd, rgn, false); 2046        result = callWindowProc (hwnd, OS.WM_PAINT, wParam, lParam); 2047        GCData data = new GCData (); 2048        data.hwnd = hwnd; 2049        GC gc = new_GC (data); 2050        if (gc != null) { 2051            OS.HideCaret (hwnd); 2052            RECT rect = new RECT(); 2053            OS.GetRgnBox (rgn, rect); 2054            int width = rect.right - rect.left; 2055            int height = rect.bottom - rect.top; 2056            if (width != 0 && height != 0) { 2057                int hDC = gc.handle; 2058                OS.SelectClipRgn (hDC, rgn); 2059                OS.SetMetaRgn (hDC); 2060                Event event = new Event (); 2061                event.gc = gc; 2062                event.x = rect.left; 2063                event.y = rect.top; 2064                event.width = width; 2065                event.height = height; 2066                sendEvent (SWT.Paint, event); 2067                // widget could be disposed at this point 2068 event.gc = null; 2069            } 2070            gc.dispose (); 2071            OS.ShowCaret (hwnd); 2072        } 2073        OS.DeleteObject (rgn); 2074    } 2075    if (result == 0) return LRESULT.ZERO; 2076    return new LRESULT (result); 2077} 2078 2079LRESULT wmPrint (int hwnd, int wParam, int lParam) { 2080    /* 2081    * Bug in Windows. When WM_PRINT is used to print the contents 2082    * of a control that has WS_EX_CLIENTEDGE, the old 3D border is 2083    * drawn instead of the theme border. The fix is to call the 2084    * default window proc and then draw the theme border on top. 2085    */ 2086    if ((lParam & OS.PRF_NONCLIENT) != 0) { 2087        if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) { 2088            int bits = OS.GetWindowLong (hwnd, OS.GWL_EXSTYLE); 2089            if ((bits & OS.WS_EX_CLIENTEDGE) != 0) { 2090                int code = callWindowProc (hwnd, OS.WM_PRINT, wParam, lParam); 2091                RECT rect = new RECT (); 2092                OS.GetWindowRect (hwnd, rect); 2093                rect.right -= rect.left; 2094                rect.bottom -= rect.top; 2095                rect.left = rect.top = 0; 2096                int border = OS.GetSystemMetrics (OS.SM_CXEDGE); 2097                OS.ExcludeClipRect (wParam, border, border, rect.right - border, rect.bottom - border); 2098                OS.DrawThemeBackground (display.hEditTheme (), wParam, OS.EP_EDITTEXT, OS.ETS_NORMAL, rect, null); 2099                return new LRESULT (code); 2100            } 2101        } 2102    } 2103    return null; 2104} 2105 2106LRESULT wmRButtonDblClk (int hwnd, int wParam, int lParam) { 2107    /* 2108    * Feature in Windows. Windows sends the following 2109    * messages when the user double clicks the mouse: 2110    * 2111    * WM_RBUTTONDOWN - mouse down 2112    * WM_RBUTTONUP - mouse up 2113    * WM_RBUTTONDBLCLK - double click 2114    * WM_LBUTTONUP - mouse up 2115    * 2116    * Applications that expect matching mouse down/up 2117    * pairs will not see the second mouse down. The 2118    * fix is to send a mouse down event. 2119    */ 2120    LRESULT result = null; 2121    Display display = this.display; 2122    display.captureChanged = false; 2123    sendMouseEvent (SWT.MouseDown, 3, hwnd, OS.WM_RBUTTONDOWN, wParam, lParam); 2124    if (sendMouseEvent (SWT.MouseDoubleClick, 3, hwnd, OS.WM_RBUTTONDBLCLK, wParam, lParam)) { 2125        result = new LRESULT (callWindowProc (hwnd, OS.WM_RBUTTONDBLCLK, wParam, lParam)); 2126    } else { 2127        result = LRESULT.ZERO; 2128    } 2129    if (!display.captureChanged && !isDisposed ()) { 2130        if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 2131    } 2132    return result; 2133} 2134 2135LRESULT wmRButtonDown (int hwnd, int wParam, int lParam) { 2136    LRESULT result = null; 2137    Display display = this.display; 2138    display.captureChanged = false; 2139    if (sendMouseEvent (SWT.MouseDown, 3, hwnd, OS.WM_RBUTTONDOWN, wParam, lParam)) { 2140        result = new LRESULT (callWindowProc (hwnd, OS.WM_RBUTTONDOWN, wParam, lParam)); 2141    } else { 2142        result = LRESULT.ZERO; 2143    } 2144    if (!display.captureChanged && !isDisposed ()) { 2145        if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 2146    } 2147    return result; 2148} 2149 2150LRESULT wmRButtonUp (int hwnd, int wParam, int lParam) { 2151    Display display = this.display; 2152    LRESULT result = null; 2153    if (sendMouseEvent (SWT.MouseUp, 3, hwnd, OS.WM_RBUTTONUP, wParam, lParam)) { 2154        result = new LRESULT (callWindowProc (hwnd, OS.WM_RBUTTONUP, wParam, lParam)); 2155    } else { 2156        /* Call the DefWindowProc() to support WM_CONTEXTMENU */ 2157        OS.DefWindowProc (hwnd, OS.WM_RBUTTONUP, wParam, lParam); 2158        result = LRESULT.ZERO; 2159    } 2160    /* 2161    * Bug in Windows. On some machines that do not have XBUTTONs, 2162    * the MK_XBUTTON1 and OS.MK_XBUTTON2 bits are sometimes set, 2163    * causing mouse capture to become stuck. The fix is to test 2164    * for the extra buttons only when they exist. 2165    */ 2166    int mask = OS.MK_LBUTTON | OS.MK_MBUTTON | OS.MK_RBUTTON; 2167    if (display.xMouse) mask |= OS.MK_XBUTTON1 | OS.MK_XBUTTON2; 2168    if (((wParam & 0xFFFF) & mask) == 0) { 2169        if (OS.GetCapture () == hwnd) OS.ReleaseCapture (); 2170    } 2171    return result; 2172} 2173 2174LRESULT wmSetFocus (int hwnd, int wParam, int lParam) { 2175    int code = callWindowProc (hwnd, OS.WM_SETFOCUS, wParam, lParam); 2176    sendFocusEvent (SWT.FocusIn); 2177    // widget could be disposed at this point 2178 2179    /* 2180    * It is possible (but unlikely), that application 2181    * code could have disposed the widget in the focus 2182    * or activate events. If this happens, end the 2183    * processing of the Windows message by returning 2184    * zero as the result of the window proc. 2185    */ 2186    if (isDisposed ()) return LRESULT.ZERO; 2187    if (code == 0) return LRESULT.ZERO; 2188    return new LRESULT (code); 2189} 2190 2191LRESULT wmSysChar (int hwnd, int wParam, int lParam) { 2192    Display display = this.display; 2193    display.lastAscii = wParam; 2194    display.lastNull = wParam == 0; 2195 2196    /* Do not issue a key down if a menu bar mnemonic was invoked */ 2197    if (!hooks (SWT.KeyDown) && !display.filters (SWT.KeyDown)) { 2198        return null; 2199    } 2200     2201    /* Call the window proc to determine whether it is a system key or mnemonic */ 2202    boolean oldKeyHit = display.mnemonicKeyHit; 2203    display.mnemonicKeyHit = true; 2204    int result = callWindowProc (hwnd, OS.WM_SYSCHAR, wParam, lParam); 2205    boolean consumed = false; 2206    if (!display.mnemonicKeyHit) { 2207        consumed = !sendKeyEvent (SWT.KeyDown, OS.WM_SYSCHAR, wParam, lParam); 2208        // widget could be disposed at this point 2209 } 2210    consumed |= display.mnemonicKeyHit; 2211    display.mnemonicKeyHit = oldKeyHit; 2212    return consumed ? LRESULT.ONE : new LRESULT (result); 2213} 2214 2215LRESULT wmSysKeyDown (int hwnd, int wParam, int lParam) { 2216    /* 2217    * Feature in Windows. When WM_SYSKEYDOWN is sent, 2218    * the user pressed ALT+<key> or F10 to get to the 2219    * menu bar. In order to issue events for F10 but 2220    * ignore other key presses when the ALT is not down, 2221    * make sure that either F10 was pressed or that ALT 2222    * is pressed. 2223    */ 2224    if (wParam != OS.VK_F10) { 2225        /* Make sure WM_SYSKEYDOWN was sent by ALT-<aKey>. */ 2226        if ((lParam & 0x20000000) == 0) return null; 2227    } 2228     2229    /* Ignore well known system keys */ 2230    switch (wParam) { 2231        case OS.VK_F4: { 2232            int hwndShell = hwnd; 2233            while (OS.GetParent (hwndShell) != 0) { 2234                if (OS.GetWindow (hwndShell, OS.GW_OWNER) != 0) break; 2235                hwndShell = OS.GetParent (hwndShell); 2236            } 2237            int bits = OS.GetWindowLong (hwndShell, OS.GWL_STYLE); 2238            if ((bits & OS.WS_SYSMENU) != 0) return null; 2239        } 2240    } 2241     2242    /* Ignore repeating modifier keys by testing key down state */ 2243    switch (wParam) { 2244        case OS.VK_SHIFT: 2245        case OS.VK_MENU: 2246        case OS.VK_CONTROL: 2247        case OS.VK_CAPITAL: 2248        case OS.VK_NUMLOCK: 2249        case OS.VK_SCROLL: 2250            if ((lParam & 0x40000000) != 0) return null; 2251    } 2252     2253    /* Clear last key and last ascii because a new key has been typed */ 2254    display.lastAscii = display.lastKey = 0; 2255    display.lastVirtual = display.lastNull = display.lastDead = false; 2256 2257    /* If are going to get a WM_SYSCHAR, ignore this message. */ 2258    /* 2259    * Bug in WinCE. MapVirtualKey() returns incorrect values. 2260    * The fix is to rely on a key mappings table to determine 2261    * whether the key event must be sent now or if a WM_CHAR 2262    * event will follow. The key mappings table maps virtual 2263    * keys to SWT key codes and does not contain mappings for 2264    * Windows virtual keys like VK_A. Virtual keys that are 2265    * both virtual and ASCII are a special case. 2266    */ 2267    int mapKey = 0; 2268    if (OS.IsWinCE) { 2269        switch (wParam) { 2270            case OS.VK_BACK: mapKey = SWT.BS; break; 2271            case OS.VK_RETURN: mapKey = SWT.CR; break; 2272            case OS.VK_DELETE: mapKey = SWT.DEL; break; 2273            case OS.VK_ESCAPE: mapKey = SWT.ESC; break; 2274            case OS.VK_TAB: mapKey = SWT.TAB; break; 2275        } 2276    } else { 2277        mapKey = OS.MapVirtualKey (wParam, 2); 2278    } 2279    display.lastVirtual = mapKey == 0 || display.numpadKey (wParam) != 0; 2280    if (display.lastVirtual) { 2281        display.lastKey = wParam; 2282        /* 2283        * Feature in Windows. The virtual key VK_DELETE is not 2284        * treated as both a virtual key and an ASCII key by Windows. 2285        * Therefore, we will not receive a WM_SYSCHAR for this key. 2286        * The fix is to treat VK_DELETE as a special case and map 2287        * the ASCII value explicitly (Delete is 0x7F). 2288        */ 2289        if (display.lastKey == OS.VK_DELETE) display.lastAscii = 0x7F; 2290 2291        /* When a keypad key is typed, a WM_SYSCHAR is not issued */ 2292        if (OS.VK_NUMPAD0 <= display.lastKey && display.lastKey <= OS.VK_DIVIDE) { 2293            /* 2294            * A WM_SYSCHAR will be issued for '*', '+', '-', '.' and '/' 2295            * on the numeric keypad. Avoid issuing the key event twice 2296            * by checking for these keys. Note that calling to ToAscii() 2297            * or ToUnicode(), clear the character that is entered using 2298            * the special Windows keypad sequence when NumLock is down 2299            * (ie. typing ALT+0231 should gives 'c' with a cedilla when 2300            * NumLock is down). Do not call either of these from here. 2301            */ 2302            switch (display.lastKey) { 2303                case OS.VK_MULTIPLY: 2304                case OS.VK_ADD: 2305                case OS.VK_SUBTRACT: 2306                case OS.VK_DECIMAL: 2307                case OS.VK_DIVIDE: return null; 2308            } 2309            display.lastAscii = display.numpadKey (display.lastKey); 2310        } 2311    } else { 2312        /* 2313        * Convert LastKey to lower case because Windows non-virtual 2314        * keys that are also ASCII keys, such as like VK_A, are have 2315        * upper case values in WM_SYSKEYDOWN despite the fact that the 2316        * Shift was not pressed. 2317        */ 2318        display.lastKey = OS.CharLower ((short) mapKey); 2319 2320        /* 2321        * Feature in Windows 98. MapVirtualKey() indicates that 2322        * a WM_SYSCHAR message will occur for Alt+Enter but 2323        * this message never happens. The fix is to issue the 2324        * event from WM_SYSKEYDOWN and map VK_RETURN to '\r'. 2325        */ 2326        if (OS.IsWinNT) return null; 2327        if (wParam != OS.VK_RETURN) return null; 2328        display.lastAscii = '\r'; 2329    } 2330 2331    if (!sendKeyEvent (SWT.KeyDown, OS.WM_SYSKEYDOWN, wParam, lParam)) { 2332        return LRESULT.ONE; 2333    } 2334    // widget could be disposed at this point 2335 return null; 2336} 2337 2338LRESULT wmSysKeyUp (int hwnd, int wParam, int lParam) { 2339    return wmKeyUp (hwnd, wParam, lParam); 2340} 2341 2342LRESULT wmXButtonDblClk (int hwnd, int wParam, int lParam) { 2343    /* 2344    * Feature in Windows. Windows sends the following 2345    * messages when the user double clicks the mouse: 2346    * 2347    * WM_XBUTTONDOWN - mouse down 2348    * WM_XBUTTONUP - mouse up 2349    * WM_XLBUTTONDBLCLK - double click 2350    * WM_XBUTTONUP - mouse up 2351    * 2352    * Applications that expect matching mouse down/up 2353    * pairs will not see the second mouse down. The 2354    * fix is to send a mouse down event. 2355    */ 2356    LRESULT result = null; 2357    Display display = this.display; 2358    display.captureChanged = false; 2359    int button = (wParam >> 16 == OS.XBUTTON1) ? 4 : 5; 2360    sendMouseEvent (SWT.MouseDown, button, hwnd, OS.WM_XBUTTONDOWN, wParam, lParam); 2361    if (sendMouseEvent (SWT.MouseDoubleClick, button, hwnd, OS.WM_XBUTTONDBLCLK, wParam, lParam)) { 2362        result = new LRESULT (callWindowProc (hwnd, OS.WM_XBUTTONDBLCLK, wParam, lParam)); 2363    } else { 2364        result = LRESULT.ZERO; 2365    } 2366    if (!display.captureChanged && !isDisposed ()) { 2367        if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 2368    } 2369    return result; 2370} 2371 2372LRESULT wmXButtonDown (int hwnd, int wParam, int lParam) { 2373    LRESULT result = null; 2374    Display display = this.display; 2375    display.captureChanged = false; 2376    display.xMouse = true; 2377    int button = (wParam >> 16 == OS.XBUTTON1) ? 4 : 5; 2378    if (sendMouseEvent (SWT.MouseDown, button, hwnd, OS.WM_XBUTTONDOWN, wParam, lParam)) { 2379        result = new LRESULT (callWindowProc (hwnd, OS.WM_XBUTTONDOWN, wParam, lParam)); 2380    } else { 2381        result = LRESULT.ZERO; 2382    } 2383    if (!display.captureChanged && !isDisposed ()) { 2384        if (OS.GetCapture () != hwnd) OS.SetCapture (hwnd); 2385    } 2386    return result; 2387} 2388 2389LRESULT wmXButtonUp (int hwnd, int wParam, int lParam) { 2390    Display display = this.display; 2391    LRESULT result = null; 2392    int button = (wParam >> 16 == OS.XBUTTON1) ? 4 : 5; 2393    if (sendMouseEvent (SWT.MouseUp, button, hwnd, OS.WM_XBUTTONUP, wParam, lParam)) { 2394        result = new LRESULT (callWindowProc (hwnd, OS.WM_XBUTTONUP, wParam, lParam)); 2395    } else { 2396        result = LRESULT.ZERO; 2397    } 2398    /* 2399    * Bug in Windows. On some machines that do not have XBUTTONs, 2400    * the MK_XBUTTON1 and OS.MK_XBUTTON2 bits are sometimes set, 2401    * causing mouse capture to become stuck. The fix is to test 2402    * for the extra buttons only when they exist. 2403    */ 2404    int mask = OS.MK_LBUTTON | OS.MK_MBUTTON | OS.MK_RBUTTON; 2405    if (display.xMouse) mask |= OS.MK_XBUTTON1 | OS.MK_XBUTTON2; 2406    if (((wParam & 0xFFFF) & mask) == 0) { 2407        if (OS.GetCapture () == hwnd) OS.ReleaseCapture (); 2408    } 2409    return result; 2410} 2411} 2412

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