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 }
 330
 331 void wxKeyEvent::CopyObject(wxObject& obj_d) const
 332 {
 333     wxKeyEvent *obj = (wxKeyEvent *)&obj_d;
 334     wxEvent::CopyObject(obj_d);
 335
 336     obj->m_shiftDown   = m_shiftDown;
 337     obj->m_controlDown = m_controlDown;
 338     obj->m_metaDown    = m_metaDown;
 339     obj->m_altDown     = m_altDown;
 340     obj->m_keyCode     = m_keyCode;
 341 }
 342
 343
 344 /*
 345  * Misc events
 346  */
 347
 348 void wxSizeEvent::CopyObject(wxObject& obj_d) const
 349 {
 350     wxSizeEvent *obj = (wxSizeEvent *)&obj_d;
 351     wxEvent::CopyObject(obj_d);
 352
 353     obj->m_size = m_size;
 354 }
 355
 356 void wxMoveEvent::CopyObject(wxObject& obj_d) const
 357 {
 358     wxMoveEvent *obj = (wxMoveEvent *)&obj_d;
 359     wxEvent::CopyObject(obj_d);
 360
 361     obj->m_pos = m_pos;
 362 }
 363
 364 void wxEraseEvent::CopyObject(wxObject& obj_d) const
 365 {
 366     wxEraseEvent *obj = (wxEraseEvent *)&obj_d;
 367     wxEvent::CopyObject(obj_d);
 368
 369     obj->m_dc = m_dc;
 370 }
 371
 372 void wxActivateEvent::CopyObject(wxObject& obj_d) const
 373 {
 374     wxActivateEvent *obj = (wxActivateEvent *)&obj_d;
 375     wxEvent::CopyObject(obj_d);
 376
 377     obj->m_active = m_active;
 378 }
 379
 380 void wxMenuEvent::CopyObject(wxObject& obj_d) const
 381 {
 382     wxMenuEvent *obj = (wxMenuEvent *)&obj_d;
 383     wxEvent::CopyObject(obj_d);
 384
 385     obj->m_menuId = m_menuId;
 386 }
 387
 388 void wxCloseEvent::CopyObject(wxObject& obj_d) const
 389 {
 390     wxCloseEvent *obj = (wxCloseEvent *)&obj_d;
 391     wxEvent::CopyObject(obj_d);
 392
 393     obj->m_loggingOff = m_loggingOff;
 394     obj->m_veto = m_veto;
 395 #if WXWIN_COMPATIBILITY
 396     obj->m_force = m_force;
 397 #endif
 398     obj->m_canVeto = m_canVeto;
 399 }
 400
 401 void wxShowEvent::CopyObject(wxObject& obj_d) const
 402 {
 403     wxShowEvent *obj = (wxShowEvent *)&obj_d;
 404     wxEvent::CopyObject(obj_d);
 405
 406     obj->m_show = m_show;
 407 }
 408
 409
 410 /*
 411  * Event handler
 412  */
 413
 414 wxEvtHandler::wxEvtHandler()
 415 {
 416     m_nextHandler = (wxEvtHandler *) NULL;
 417     m_previousHandler = (wxEvtHandler *) NULL;
 418     m_enabled = TRUE;
 419     m_dynamicEvents = (wxList *) NULL;
 420     m_isWindow = FALSE;
 421 #if wxUSE_THREADS
 422     m_eventsLocker = new wxCriticalSection();
 423 #endif
 424     m_pendingEvents = (wxList *) NULL;
 425 }
 426
 427 wxEvtHandler::~wxEvtHandler()
 428 {
 429     // Takes itself out of the list of handlers
 430     if (m_previousHandler)
 431         m_previousHandler->m_nextHandler = m_nextHandler;
 432
 433     if (m_nextHandler)
 434         m_nextHandler->m_previousHandler = m_previousHandler;
 435
 436     if (m_dynamicEvents)
 437     {
 438         wxNode *node = m_dynamicEvents->First();
 439         while (node)
 440         {
 441             wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 442             if (entry->m_callbackUserData) delete entry->m_callbackUserData;
 443             delete entry;
 444             node = node->Next();
 445         }
 446         delete m_dynamicEvents;
 447     };
 448
 449 #if wxUSE_THREADS
 450     if (m_pendingEvents)
 451       delete m_pendingEvents;
 452
 453     delete m_eventsLocker;
 454 #endif
 455 }
 456
 457 #if wxUSE_THREADS
 458
 459 #ifdef __WXGTK__
 460 extern bool g_isIdle;
 461
 462 extern void wxapp_install_idle_handler();
 463 #endif
 464
 465 bool wxEvtHandler::ProcessThreadEvent(wxEvent& event)
 466 {
 467     wxEvent *event_main;
 468     wxCriticalSectionLocker locker(*m_eventsLocker);
 469
 470
 471     // check that we are really in a child thread
 472     wxASSERT( !wxThread::IsMain() );
 473
 474     if (m_pendingEvents == NULL)
 475       m_pendingEvents = new wxList();
 476
 477     event_main = (wxEvent *)event.Clone();
 478
 479     m_pendingEvents->Append(event_main);
 480
 481     wxPendingEventsLocker->Enter();
 482     wxPendingEvents->Append(this);
 483     wxPendingEventsLocker->Leave();
 484
 485 #ifdef __WXGTK__
 486     if (g_isIdle) wxapp_install_idle_handler();
 487 #endif
 488
 489     return TRUE;
 490 }
 491
 492 void wxEvtHandler::ProcessPendingEvents()
 493 {
 494     wxCriticalSectionLocker locker(*m_eventsLocker);
 495     wxNode *node = m_pendingEvents->First();
 496     wxEvent *event;
 497
 498     while (node != NULL) {
 499       event = (wxEvent *)node->Data();
 500       ProcessEvent(*event);
 501       delete node;
 502       node = m_pendingEvents->First();
 503     }
 504 }
 505 #endif
 506
 507 /*
 508  * Event table stuff
 509  */
 510
 511 bool wxEvtHandler::ProcessEvent(wxEvent& event)
 512 {
 513     // check that our flag corresponds to reality
 514     wxASSERT( m_isWindow == IsKindOf(CLASSINFO(wxWindow)) );
 515
 516     // An event handler can be enabled or disabled
 517     if ( GetEvtHandlerEnabled() )
 518     {
 519 #if wxUSE_THREADS
 520         // Check whether we are in a child thread.
 521         if (!wxThread::IsMain())
 522           return ProcessThreadEvent(event);
 523 #endif
 524         // Handle per-instance dynamic event tables first
 525
 526         if ( m_dynamicEvents && SearchDynamicEventTable(event) )
 527             return TRUE;
 528
 529         // Then static per-class event tables
 530
 531         const wxEventTable *table = GetEventTable();
 532
 533         // Try the associated validator first, if this is a window.
 534         // Problem: if the event handler of the window has been replaced,
 535         // this wxEvtHandler may no longer be a window.
 536         // Therefore validators won't be processed if the handler
 537         // has been replaced with SetEventHandler.
 538         // THIS CAN BE CURED if PushEventHandler is used instead of
 539         // SetEventHandler, and then processing will be passed down the
 540         // chain of event handlers.
 541         if ( m_isWindow )
 542         {
 543             wxWindow *win = (wxWindow *)this;
 544
 545             // Can only use the validator of the window which
 546             // is receiving the event
 547             if ( win == event.GetEventObject() )
 548             {
 549                 wxValidator *validator = win->GetValidator();
 550                 if ( validator && validator->ProcessEvent(event) )
 551                 {
 552                     return TRUE;
 553                 }
 554             }
 555         }
 556
 557         // Search upwards through the inheritance hierarchy
 558         while ( table )
 559         {
 560             if ( SearchEventTable((wxEventTable&)*table, event) )
 561                 return TRUE;
 562             table = table->baseTable;
 563         }
 564     }
 565
 566     // Try going down the event handler chain
 567     if ( GetNextHandler() )
 568     {
 569         if ( GetNextHandler()->ProcessEvent(event) )
 570             return TRUE;
 571     }
 572
 573     // Carry on up the parent-child hierarchy,
 574     // but only if event is a command event: it wouldn't
 575     // make sense for a parent to receive a child's size event, for example
 576     if ( m_isWindow && event.IsCommandEvent() )
 577     {
 578         wxWindow *win = (wxWindow *)this;
 579         wxWindow *parent = win->GetParent();
 580         if (parent && !parent->IsBeingDeleted())
 581             return parent->GetEventHandler()->ProcessEvent(event);
 582     }
 583
 584     // Last try - application object.
 585     if ( wxTheApp && (this != wxTheApp) )
 586     {
 587         // Special case: don't pass wxEVT_IDLE to wxApp, since it'll always
 588         // swallow it. wxEVT_IDLE is sent explicitly to wxApp so it will be
 589         // processed appropriately via SearchEventTable.
 590         if ( event.GetEventType() != wxEVT_IDLE )
 591         {
 592             if ( wxTheApp->ProcessEvent(event) )
 593                 return TRUE;
 594         }
 595     }
 596
 597     return FALSE;
 598 }
 599
 600 bool wxEvtHandler::SearchEventTable(wxEventTable& table, wxEvent& event)
 601 {
 602     int i = 0;
 603     int commandId = event.GetId();
 604
 605     // BC++ doesn't like while (table.entries[i].m_fn)
 606
 607 #ifdef __SC__
 608     while (table.entries[i].m_fn != 0)
 609 #else
 610     while (table.entries[i].m_fn != 0L)
 611 #endif
 612     {
 613         if ((event.GetEventType() == table.entries[i].m_eventType) &&
 614                 (table.entries[i].m_id == -1 || // Match, if event spec says any id will do (id == -1)
 615                  (table.entries[i].m_lastId == -1 && commandId == table.entries[i].m_id) ||
 616                  (table.entries[i].m_lastId != -1 &&
 617                   (commandId >= table.entries[i].m_id && commandId <= table.entries[i].m_lastId))))
 618         {
 619             event.Skip(FALSE);
 620             event.m_callbackUserData = table.entries[i].m_callbackUserData;
 621
 622             (this->*((wxEventFunction) (table.entries[i].m_fn)))(event);
 623
 624             if ( event.GetSkipped() )
 625                 return FALSE;
 626             else
 627                 return TRUE;
 628         }
 629         i++;
 630     }
 631     return FALSE;
 632 }
 633 void wxEvtHandler::Connect( int id, int lastId,
 634                             wxEventType eventType,
 635                             wxObjectEventFunction func,
 636                             wxObject *userData )
 637 {
 638     wxEventTableEntry *entry = new wxEventTableEntry;
 639     entry->m_id = id;
 640     entry->m_lastId = lastId;
 641     entry->m_eventType = eventType;
 642     entry->m_fn = func;
 643     entry->m_callbackUserData = userData;
 644
 645     if (!m_dynamicEvents)
 646         m_dynamicEvents = new wxList;
 647
 648     m_dynamicEvents->Append( (wxObject*) entry );
 649 }
 650
 651 bool wxEvtHandler::SearchDynamicEventTable( wxEvent& event )
 652 {
 653     wxCHECK_MSG( m_dynamicEvents, FALSE,
 654                  _T("caller should check that we have dynamic events") );
 655
 656     int commandId = event.GetId();
 657
 658     wxNode *node = m_dynamicEvents->First();
 659     while (node)
 660     {
 661         wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 662
 663         if (entry->m_fn)
 664         {
 665             // Match, if event spec says any id will do (id == -1)
 666             if ( (event.GetEventType() == entry->m_eventType) &&
 667                  (entry->m_id == -1 ||
 668                   (entry->m_lastId == -1 && commandId == entry->m_id) ||
 669                   (entry->m_lastId != -1 &&
 670                   (commandId >= entry->m_id && commandId <= entry->m_lastId))) )
 671             {
 672                 event.Skip(FALSE);
 673                 event.m_callbackUserData = entry->m_callbackUserData;
 674
 675                 (this->*((wxEventFunction) (entry->m_fn)))(event);
 676
 677                 if (event.GetSkipped())
 678                     return FALSE;
 679                 else
 680                     return TRUE;
 681             }
 682         }
 683         node = node->Next();
 684     }
 685     return FALSE;
 686 };
 687
 688 #if WXWIN_COMPATIBILITY
 689 bool wxEvtHandler::OnClose()
 690 {
 691     if (GetNextHandler())
 692         return GetNextHandler()->OnClose();
 693     else
 694         return FALSE;
 695 }
 696 #endif // WXWIN_COMPATIBILITY
 697
 698 // Find a window with the focus, that is also a descendant of the given window.
 699 // This is used to determine the window to initially send commands to.
 700 wxWindow* wxFindFocusDescendant(wxWindow* ancestor)
 701 {
 702     // Process events starting with the window with the focus, if any.
 703     wxWindow* focusWin = wxWindow::FindFocus();
 704     wxWindow* win = focusWin;
 705
 706     // Check if this is a descendant of this frame.
 707     // If not, win will be set to NULL.
 708     while (win)
 709     {
 710         if (win == ancestor)
 711             break;
 712         else
 713             win = win->GetParent();
 714     }
 715     if (win == (wxWindow*) NULL)
 716         focusWin = (wxWindow*) NULL;
 717
 718     return focusWin;
 719 }
 720