src/common/event.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        event.cpp
   3 // Purpose:     Event classes
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:       wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13     #pragma implementation "event.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/defs.h"
  25     #include "wx/control.h"
  26     #include "wx/utils.h"
  27     #include "wx/app.h"
  28     #include "wx/dc.h"
  29 #endif
  30
  31 #include "wx/event.h"
  32 #include "wx/validate.h"
  33
  34 #if !USE_SHARED_LIBRARY
  35     IMPLEMENT_DYNAMIC_CLASS(wxEvtHandler, wxObject)
  36     IMPLEMENT_ABSTRACT_CLASS(wxEvent, wxObject)
  37     IMPLEMENT_DYNAMIC_CLASS(wxCommandEvent, wxEvent)
  38     IMPLEMENT_DYNAMIC_CLASS(wxNotifyEvent, wxCommandEvent)
  39     IMPLEMENT_DYNAMIC_CLASS(wxScrollEvent, wxCommandEvent)
  40     IMPLEMENT_DYNAMIC_CLASS(wxScrollWinEvent, wxEvent)
  41     IMPLEMENT_DYNAMIC_CLASS(wxMouseEvent, wxEvent)
  42     IMPLEMENT_DYNAMIC_CLASS(wxKeyEvent, wxEvent)
  43     IMPLEMENT_DYNAMIC_CLASS(wxSizeEvent, wxEvent)
  44     IMPLEMENT_DYNAMIC_CLASS(wxPaintEvent, wxEvent)
  45     IMPLEMENT_DYNAMIC_CLASS(wxEraseEvent, wxEvent)
  46     IMPLEMENT_DYNAMIC_CLASS(wxMoveEvent, wxEvent)
  47     IMPLEMENT_DYNAMIC_CLASS(wxFocusEvent, wxEvent)
  48     IMPLEMENT_DYNAMIC_CLASS(wxCloseEvent, wxEvent)
  49     IMPLEMENT_DYNAMIC_CLASS(wxShowEvent, wxEvent)
  50     IMPLEMENT_DYNAMIC_CLASS(wxMaximizeEvent, wxEvent)
  51     IMPLEMENT_DYNAMIC_CLASS(wxIconizeEvent, wxEvent)
  52     IMPLEMENT_DYNAMIC_CLASS(wxMenuEvent, wxEvent)
  53     IMPLEMENT_DYNAMIC_CLASS(wxJoystickEvent, wxEvent)
  54     IMPLEMENT_DYNAMIC_CLASS(wxDropFilesEvent, wxEvent)
  55     IMPLEMENT_DYNAMIC_CLASS(wxActivateEvent, wxEvent)
  56     IMPLEMENT_DYNAMIC_CLASS(wxInitDialogEvent, wxEvent)
  57     IMPLEMENT_DYNAMIC_CLASS(wxSysColourChangedEvent, wxEvent)
  58     IMPLEMENT_DYNAMIC_CLASS(wxIdleEvent, wxEvent)
  59     IMPLEMENT_DYNAMIC_CLASS(wxUpdateUIEvent, wxCommandEvent)
  60     IMPLEMENT_DYNAMIC_CLASS(wxNavigationKeyEvent, wxCommandEvent)
  61     IMPLEMENT_DYNAMIC_CLASS(wxPaletteChangedEvent, wxEvent)
  62     IMPLEMENT_DYNAMIC_CLASS(wxQueryNewPaletteEvent, wxEvent)
  63
  64     const wxEventTable *wxEvtHandler::GetEventTable() const
  65         { return &wxEvtHandler::sm_eventTable; }
  66
  67     const wxEventTable wxEvtHandler::sm_eventTable =
  68         { (const wxEventTable *)NULL, &wxEvtHandler::sm_eventTableEntries[0] };
  69
  70     const wxEventTableEntry wxEvtHandler::sm_eventTableEntries[] =
  71         { { 0, 0, 0, (wxObjectEventFunction) NULL, (wxObject*) NULL } };
  72
  73 #endif // !USE_SHARED_LIBRARY
  74
  75 #if wxUSE_THREADS
  76 /* To put pending event handlers */
  77 extern wxList *wxPendingEvents;
  78 extern wxCriticalSection *wxPendingEventsLocker;
  79 #endif
  80
  81 /*
  82  * General wxWindows events, covering
  83  * all interesting things that might happen (button clicking, resizing,
  84  * setting text in widgets, etc.).
  85  *
  86  * For each completely new event type, derive a new event class.
  87  *
  88  */
  89
  90 wxEvent::wxEvent(int theId)
  91 {
  92     m_eventType = wxEVT_NULL;
  93     m_eventObject = (wxObject *) NULL;
  94     m_eventHandle = (char *) NULL;
  95     m_timeStamp = 0;
  96     m_id = theId;
  97     m_skipped = FALSE;
  98     m_callbackUserData = (wxObject *) NULL;
  99     m_isCommandEvent = FALSE;
 100 }
 101
 102 void wxEvent::CopyObject(wxObject& object_dest) const
 103 {
 104     wxEvent *obj = (wxEvent *)&object_dest;
 105     wxObject::CopyObject(object_dest);
 106
 107     obj->m_eventType = m_eventType;
 108     obj->m_eventObject = m_eventObject;
 109     obj->m_eventHandle = m_eventHandle;
 110     obj->m_timeStamp = m_timeStamp;
 111     obj->m_id = m_id;
 112     obj->m_skipped = m_skipped;
 113     obj->m_callbackUserData = m_callbackUserData;
 114     obj->m_isCommandEvent = m_isCommandEvent;
 115 }
 116
 117 /*
 118  * Command events
 119  *
 120  */
 121
 122 wxCommandEvent::wxCommandEvent(wxEventType commandType, int theId)
 123 {
 124     m_eventType = commandType;
 125     m_clientData = (char *) NULL;
 126     m_clientObject = (wxClientData *) NULL;
 127     m_extraLong = 0;
 128     m_commandInt = 0;
 129     m_id = theId;
 130     m_commandString = (wxChar *) NULL;
 131     m_isCommandEvent = TRUE;
 132 }
 133
 134 void wxCommandEvent::CopyObject(wxObject& obj_d) const
 135 {
 136     wxCommandEvent *obj = (wxCommandEvent *)&obj_d;
 137
 138     wxEvent::CopyObject(obj_d);
 139
 140     obj->m_clientData   = m_clientData;
 141     obj->m_clientObject = m_clientObject;
 142     obj->m_extraLong    = m_extraLong;
 143     obj->m_commandInt   = m_commandInt;
 144 }
 145
 146 /*
 147  * Scroll events
 148  */
 149
 150 wxScrollEvent::wxScrollEvent(wxEventType commandType,
 151                              int id,
 152                              int pos,
 153                              int orient)
 154              : wxCommandEvent(commandType, id)
 155 {
 156     m_extraLong = orient;
 157     m_commandInt = pos;
 158 }
 159
 160 /*
 161  * ScrollWin events
 162  */
 163
 164 wxScrollWinEvent::wxScrollWinEvent(wxEventType commandType,
 165                                    int pos,
 166                                    int orient)
 167              : wxEvent(commandType)
 168 {
 169     m_extraLong = orient;
 170     m_commandInt = pos;
 171 }
 172
 173 /*
 174  * Mouse events
 175  *
 176  */
 177
 178 wxMouseEvent::wxMouseEvent(wxEventType commandType)
 179 {
 180     m_eventType = commandType;
 181     m_metaDown = FALSE;
 182     m_altDown = FALSE;
 183     m_controlDown = FALSE;
 184     m_shiftDown = FALSE;
 185     m_leftDown = FALSE;
 186     m_rightDown = FALSE;
 187     m_middleDown = FALSE;
 188     m_x = 0;
 189     m_y = 0;
 190 }
 191
 192 void wxMouseEvent::CopyObject(wxObject& obj_d) const
 193 {
 194     wxMouseEvent *obj = (wxMouseEvent *)&obj_d;
 195
 196     wxEvent::CopyObject(obj_d);
 197
 198     obj->m_metaDown = m_metaDown;
 199     obj->m_altDown = m_altDown;
 200     obj->m_controlDown = m_controlDown;
 201     obj->m_shiftDown = m_shiftDown;
 202     obj->m_leftDown = m_leftDown;
 203     obj->m_rightDown = m_rightDown;
 204     obj->m_middleDown = m_middleDown;
 205     obj->m_x = m_x;
 206     obj->m_y = m_y;
 207 }
 208
 209 // True if was a button dclick event (1 = left, 2 = middle, 3 = right)
 210 // or any button dclick event (but = -1)
 211 bool wxMouseEvent::ButtonDClick(int but) const
 212 {
 213     switch (but)
 214     {
 215         case -1:
 216             return (LeftDClick() || MiddleDClick() || RightDClick());
 217         case 1:
 218             return LeftDClick();
 219         case 2:
 220             return MiddleDClick();
 221         case 3:
 222             return RightDClick();
 223         default:
 224             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonDClick"));
 225     }
 226
 227     return FALSE;
 228 }
 229
 230 // True if was a button down event (1 = left, 2 = middle, 3 = right)
 231 // or any button down event (but = -1)
 232 bool wxMouseEvent::ButtonDown(int but) const
 233 {
 234     switch (but)
 235     {
 236         case -1:
 237             return (LeftDown() || MiddleDown() || RightDown());
 238         case 1:
 239             return LeftDown();
 240         case 2:
 241             return MiddleDown();
 242         case 3:
 243             return RightDown();
 244         default:
 245             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonDown"));
 246     }
 247
 248     return FALSE;
 249 }
 250
 251 // True if was a button up event (1 = left, 2 = middle, 3 = right)
 252 // or any button up event (but = -1)
 253 bool wxMouseEvent::ButtonUp(int but) const
 254 {
 255     switch (but) {
 256         case -1:
 257             return (LeftUp() || MiddleUp() || RightUp());
 258         case 1:
 259             return LeftUp();
 260         case 2:
 261             return MiddleUp();
 262         case 3:
 263             return RightUp();
 264         default:
 265             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonUp"));
 266     }
 267
 268     return FALSE;
 269 }
 270
 271 // True if the given button is currently changing state
 272 bool wxMouseEvent::Button(int but) const
 273 {
 274     switch (but) {
 275         case -1:
 276             return (ButtonUp(-1) || ButtonDown(-1) || ButtonDClick(-1)) ;
 277         case 1:
 278             return (LeftDown() || LeftUp() || LeftDClick());
 279         case 2:
 280             return (MiddleDown() || MiddleUp() || MiddleDClick());
 281         case 3:
 282             return (RightDown() || RightUp() || RightDClick());
 283         default:
 284             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::Button"));
 285     }
 286
 287     return FALSE;
 288 }
 289
 290 bool wxMouseEvent::ButtonIsDown(int but) const
 291 {
 292     switch (but) {
 293         case -1:
 294             return (LeftIsDown() || MiddleIsDown() || RightIsDown());
 295         case 1:
 296             return LeftIsDown();
 297         case 2:
 298             return MiddleIsDown();
 299         case 3:
 300             return RightIsDown();
 301         default:
 302             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonIsDown"));
 303     }
 304
 305     return FALSE;
 306 }
 307
 308 // Find the logical position of the event given the DC
 309 wxPoint wxMouseEvent::GetLogicalPosition(const wxDC& dc) const
 310 {
 311     wxPoint pt(dc.DeviceToLogicalX(m_x), dc.DeviceToLogicalY(m_y));
 312     return pt;
 313 }
 314
 315
 316 /*
 317  * Keyboard events
 318  *
 319  */
 320
 321 wxKeyEvent::wxKeyEvent(wxEventType type)
 322 {
 323     m_eventType = type;
 324     m_shiftDown = FALSE;
 325     m_controlDown = FALSE;
 326     m_metaDown = FALSE;
 327     m_altDown = FALSE;
 328     m_keyCode = 0;
 329     m_scanCode = 0;
 330 }
 331
 332 void wxKeyEvent::CopyObject(wxObject& obj_d) const
 333 {
 334     wxKeyEvent *obj = (wxKeyEvent *)&obj_d;
 335     wxEvent::CopyObject(obj_d);
 336
 337     obj->m_shiftDown   = m_shiftDown;
 338     obj->m_controlDown = m_controlDown;
 339     obj->m_metaDown    = m_metaDown;
 340     obj->m_altDown     = m_altDown;
 341     obj->m_keyCode     = m_keyCode;
 342 }
 343
 344
 345 /*
 346  * Misc events
 347  */
 348
 349 void wxSizeEvent::CopyObject(wxObject& obj_d) const
 350 {
 351     wxSizeEvent *obj = (wxSizeEvent *)&obj_d;
 352     wxEvent::CopyObject(obj_d);
 353
 354     obj->m_size = m_size;
 355 }
 356
 357 void wxMoveEvent::CopyObject(wxObject& obj_d) const
 358 {
 359     wxMoveEvent *obj = (wxMoveEvent *)&obj_d;
 360     wxEvent::CopyObject(obj_d);
 361
 362     obj->m_pos = m_pos;
 363 }
 364
 365 void wxEraseEvent::CopyObject(wxObject& obj_d) const
 366 {
 367     wxEraseEvent *obj = (wxEraseEvent *)&obj_d;
 368     wxEvent::CopyObject(obj_d);
 369
 370     obj->m_dc = m_dc;
 371 }
 372
 373 void wxActivateEvent::CopyObject(wxObject& obj_d) const
 374 {
 375     wxActivateEvent *obj = (wxActivateEvent *)&obj_d;
 376     wxEvent::CopyObject(obj_d);
 377
 378     obj->m_active = m_active;
 379 }
 380
 381 void wxMenuEvent::CopyObject(wxObject& obj_d) const
 382 {
 383     wxMenuEvent *obj = (wxMenuEvent *)&obj_d;
 384     wxEvent::CopyObject(obj_d);
 385
 386     obj->m_menuId = m_menuId;
 387 }
 388
 389 void wxCloseEvent::CopyObject(wxObject& obj_d) const
 390 {
 391     wxCloseEvent *obj = (wxCloseEvent *)&obj_d;
 392     wxEvent::CopyObject(obj_d);
 393
 394     obj->m_loggingOff = m_loggingOff;
 395     obj->m_veto = m_veto;
 396 #if WXWIN_COMPATIBILITY
 397     obj->m_force = m_force;
 398 #endif
 399     obj->m_canVeto = m_canVeto;
 400 }
 401
 402 void wxShowEvent::CopyObject(wxObject& obj_d) const
 403 {
 404     wxShowEvent *obj = (wxShowEvent *)&obj_d;
 405     wxEvent::CopyObject(obj_d);
 406
 407     obj->m_show = m_show;
 408 }
 409
 410
 411 /*
 412  * Event handler
 413  */
 414
 415 wxEvtHandler::wxEvtHandler()
 416 {
 417     m_nextHandler = (wxEvtHandler *) NULL;
 418     m_previousHandler = (wxEvtHandler *) NULL;
 419     m_enabled = TRUE;
 420     m_dynamicEvents = (wxList *) NULL;
 421     m_isWindow = FALSE;
 422 #if wxUSE_THREADS
 423     m_eventsLocker = new wxCriticalSection();
 424 #endif
 425     m_pendingEvents = (wxList *) NULL;
 426 }
 427
 428 wxEvtHandler::~wxEvtHandler()
 429 {
 430     // Takes itself out of the list of handlers
 431     if (m_previousHandler)
 432         m_previousHandler->m_nextHandler = m_nextHandler;
 433
 434     if (m_nextHandler)
 435         m_nextHandler->m_previousHandler = m_previousHandler;
 436
 437     if (m_dynamicEvents)
 438     {
 439         wxNode *node = m_dynamicEvents->First();
 440         while (node)
 441         {
 442             wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 443             if (entry->m_callbackUserData) delete entry->m_callbackUserData;
 444             delete entry;
 445             node = node->Next();
 446         }
 447         delete m_dynamicEvents;
 448     };
 449
 450 #if wxUSE_THREADS
 451     if (m_pendingEvents)
 452       delete m_pendingEvents;
 453
 454     delete m_eventsLocker;
 455 #endif
 456 }
 457
 458 #if wxUSE_THREADS
 459
 460 #ifdef __WXGTK__
 461 extern bool g_isIdle;
 462
 463 extern void wxapp_install_idle_handler();
 464 #endif
 465
 466 bool wxEvtHandler::ProcessThreadEvent(wxEvent& event)
 467 {
 468     wxEvent *event_main;
 469     wxCriticalSectionLocker locker(*m_eventsLocker);
 470
 471
 472     // check that we are really in a child thread
 473     wxASSERT( !wxThread::IsMain() );
 474
 475     if (m_pendingEvents == NULL)
 476       m_pendingEvents = new wxList();
 477
 478     event_main = (wxEvent *)event.Clone();
 479
 480     m_pendingEvents->Append(event_main);
 481
 482     wxPendingEventsLocker->Enter();
 483     wxPendingEvents->Append(this);
 484     wxPendingEventsLocker->Leave();
 485
 486 #ifdef __WXGTK__
 487     if (g_isIdle) wxapp_install_idle_handler();
 488 #endif
 489
 490     return TRUE;
 491 }
 492
 493 void wxEvtHandler::ProcessPendingEvents()
 494 {
 495     wxCriticalSectionLocker locker(*m_eventsLocker);
 496     wxNode *node = m_pendingEvents->First();
 497     wxEvent *event;
 498
 499     while (node != NULL) {
 500       event = (wxEvent *)node->Data();
 501       ProcessEvent(*event);
 502       delete node;
 503       node = m_pendingEvents->First();
 504     }
 505 }
 506 #endif
 507
 508 /*
 509  * Event table stuff
 510  */
 511
 512 bool wxEvtHandler::ProcessEvent(wxEvent& event)
 513 {
 514     // check that our flag corresponds to reality
 515     wxASSERT( m_isWindow == IsKindOf(CLASSINFO(wxWindow)) );
 516
 517     // An event handler can be enabled or disabled
 518     if ( GetEvtHandlerEnabled() )
 519     {
 520 #if wxUSE_THREADS
 521         // Check whether we are in a child thread.
 522         if (!wxThread::IsMain())
 523           return ProcessThreadEvent(event);
 524 #endif
 525         // Handle per-instance dynamic event tables first
 526
 527         if ( m_dynamicEvents && SearchDynamicEventTable(event) )
 528             return TRUE;
 529
 530         // Then static per-class event tables
 531
 532         const wxEventTable *table = GetEventTable();
 533
 534         // Try the associated validator first, if this is a window.
 535         // Problem: if the event handler of the window has been replaced,
 536         // this wxEvtHandler may no longer be a window.
 537         // Therefore validators won't be processed if the handler
 538         // has been replaced with SetEventHandler.
 539         // THIS CAN BE CURED if PushEventHandler is used instead of
 540         // SetEventHandler, and then processing will be passed down the
 541         // chain of event handlers.
 542         if ( m_isWindow )
 543         {
 544             wxWindow *win = (wxWindow *)this;
 545
 546             // Can only use the validator of the window which
 547             // is receiving the event
 548             if ( win == event.GetEventObject() )
 549             {
 550                 wxValidator *validator = win->GetValidator();
 551                 if ( validator && validator->ProcessEvent(event) )
 552                 {
 553                     return TRUE;
 554                 }
 555             }
 556         }
 557
 558         // Search upwards through the inheritance hierarchy
 559         while ( table )
 560         {
 561             if ( SearchEventTable((wxEventTable&)*table, event) )
 562                 return TRUE;
 563             table = table->baseTable;
 564         }
 565     }
 566
 567     // Try going down the event handler chain
 568     if ( GetNextHandler() )
 569     {
 570         if ( GetNextHandler()->ProcessEvent(event) )
 571             return TRUE;
 572     }
 573
 574     // Carry on up the parent-child hierarchy,
 575     // but only if event is a command event: it wouldn't
 576     // make sense for a parent to receive a child's size event, for example
 577     if ( m_isWindow && event.IsCommandEvent() )
 578     {
 579         wxWindow *win = (wxWindow *)this;
 580         wxWindow *parent = win->GetParent();
 581         if (parent && !parent->IsBeingDeleted())
 582             return parent->GetEventHandler()->ProcessEvent(event);
 583     }
 584
 585     // Last try - application object.
 586     if ( wxTheApp && (this != wxTheApp) )
 587     {
 588         // Special case: don't pass wxEVT_IDLE to wxApp, since it'll always
 589         // swallow it. wxEVT_IDLE is sent explicitly to wxApp so it will be
 590         // processed appropriately via SearchEventTable.
 591         if ( event.GetEventType() != wxEVT_IDLE )
 592         {
 593             if ( wxTheApp->ProcessEvent(event) )
 594                 return TRUE;
 595         }
 596     }
 597
 598     return FALSE;
 599 }
 600
 601 bool wxEvtHandler::SearchEventTable(wxEventTable& table, wxEvent& event)
 602 {
 603     int i = 0;
 604     int commandId = event.GetId();
 605
 606     // BC++ doesn't like while (table.entries[i].m_fn)
 607
 608 #ifdef __SC__
 609     while (table.entries[i].m_fn != 0)
 610 #else
 611     while (table.entries[i].m_fn != 0L)
 612 #endif
 613     {
 614         if ((event.GetEventType() == table.entries[i].m_eventType) &&
 615                 (table.entries[i].m_id == -1 || // Match, if event spec says any id will do (id == -1)
 616                  (table.entries[i].m_lastId == -1 && commandId == table.entries[i].m_id) ||
 617                  (table.entries[i].m_lastId != -1 &&
 618                   (commandId >= table.entries[i].m_id && commandId <= table.entries[i].m_lastId))))
 619         {
 620             event.Skip(FALSE);
 621             event.m_callbackUserData = table.entries[i].m_callbackUserData;
 622
 623             (this->*((wxEventFunction) (table.entries[i].m_fn)))(event);
 624
 625             if ( event.GetSkipped() )
 626                 return FALSE;
 627             else
 628                 return TRUE;
 629         }
 630         i++;
 631     }
 632     return FALSE;
 633 }
 634 void wxEvtHandler::Connect( int id, int lastId,
 635                             wxEventType eventType,
 636                             wxObjectEventFunction func,
 637                             wxObject *userData )
 638 {
 639     wxEventTableEntry *entry = new wxEventTableEntry;
 640     entry->m_id = id;
 641     entry->m_lastId = lastId;
 642     entry->m_eventType = eventType;
 643     entry->m_fn = func;
 644     entry->m_callbackUserData = userData;
 645
 646     if (!m_dynamicEvents)
 647         m_dynamicEvents = new wxList;
 648
 649     m_dynamicEvents->Append( (wxObject*) entry );
 650 }
 651
 652 bool wxEvtHandler::SearchDynamicEventTable( wxEvent& event )
 653 {
 654     wxCHECK_MSG( m_dynamicEvents, FALSE,
 655                  _T("caller should check that we have dynamic events") );
 656
 657     int commandId = event.GetId();
 658
 659     wxNode *node = m_dynamicEvents->First();
 660     while (node)
 661     {
 662         wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 663
 664         if (entry->m_fn)
 665         {
 666             // Match, if event spec says any id will do (id == -1)
 667             if ( (event.GetEventType() == entry->m_eventType) &&
 668                  (entry->m_id == -1 ||
 669                   (entry->m_lastId == -1 && commandId == entry->m_id) ||
 670                   (entry->m_lastId != -1 &&
 671                   (commandId >= entry->m_id && commandId <= entry->m_lastId))) )
 672             {
 673                 event.Skip(FALSE);
 674                 event.m_callbackUserData = entry->m_callbackUserData;
 675
 676                 (this->*((wxEventFunction) (entry->m_fn)))(event);
 677
 678                 if (event.GetSkipped())
 679                     return FALSE;
 680                 else
 681                     return TRUE;
 682             }
 683         }
 684         node = node->Next();
 685     }
 686     return FALSE;
 687 };
 688
 689 #if WXWIN_COMPATIBILITY
 690 bool wxEvtHandler::OnClose()
 691 {
 692     if (GetNextHandler())
 693         return GetNextHandler()->OnClose();
 694     else
 695         return FALSE;
 696 }
 697 #endif // WXWIN_COMPATIBILITY
 698
 699 // Find a window with the focus, that is also a descendant of the given window.
 700 // This is used to determine the window to initially send commands to.
 701 wxWindow* wxFindFocusDescendant(wxWindow* ancestor)
 702 {
 703     // Process events starting with the window with the focus, if any.
 704     wxWindow* focusWin = wxWindow::FindFocus();
 705     wxWindow* win = focusWin;
 706
 707     // Check if this is a descendant of this frame.
 708     // If not, win will be set to NULL.
 709     while (win)
 710     {
 711         if (win == ancestor)
 712             break;
 713         else
 714             win = win->GetParent();
 715     }
 716     if (win == (wxWindow*) NULL)
 717         focusWin = (wxWindow*) NULL;
 718
 719     return focusWin;
 720 }
 721