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(wxMouseEvent, wxEvent)
  41     IMPLEMENT_DYNAMIC_CLASS(wxKeyEvent, wxEvent)
  42     IMPLEMENT_DYNAMIC_CLASS(wxSizeEvent, wxEvent)
  43     IMPLEMENT_DYNAMIC_CLASS(wxPaintEvent, wxEvent)
  44     IMPLEMENT_DYNAMIC_CLASS(wxEraseEvent, wxEvent)
  45     IMPLEMENT_DYNAMIC_CLASS(wxMoveEvent, wxEvent)
  46     IMPLEMENT_DYNAMIC_CLASS(wxFocusEvent, wxEvent)
  47     IMPLEMENT_DYNAMIC_CLASS(wxCloseEvent, wxEvent)
  48     IMPLEMENT_DYNAMIC_CLASS(wxShowEvent, wxEvent)
  49     IMPLEMENT_DYNAMIC_CLASS(wxMaximizeEvent, wxEvent)
  50     IMPLEMENT_DYNAMIC_CLASS(wxIconizeEvent, wxEvent)
  51     IMPLEMENT_DYNAMIC_CLASS(wxMenuEvent, wxEvent)
  52     IMPLEMENT_DYNAMIC_CLASS(wxJoystickEvent, wxEvent)
  53     IMPLEMENT_DYNAMIC_CLASS(wxDropFilesEvent, wxEvent)
  54     IMPLEMENT_DYNAMIC_CLASS(wxActivateEvent, wxEvent)
  55     IMPLEMENT_DYNAMIC_CLASS(wxInitDialogEvent, wxEvent)
  56     IMPLEMENT_DYNAMIC_CLASS(wxSysColourChangedEvent, wxEvent)
  57     IMPLEMENT_DYNAMIC_CLASS(wxIdleEvent, wxEvent)
  58     IMPLEMENT_DYNAMIC_CLASS(wxUpdateUIEvent, wxCommandEvent)
  59     IMPLEMENT_DYNAMIC_CLASS(wxNavigationKeyEvent, wxCommandEvent)
  60     IMPLEMENT_DYNAMIC_CLASS(wxPaletteChangedEvent, wxEvent)
  61     IMPLEMENT_DYNAMIC_CLASS(wxQueryNewPaletteEvent, wxEvent)
  62
  63     const wxEventTable *wxEvtHandler::GetEventTable() const
  64         { return &wxEvtHandler::sm_eventTable; }
  65
  66     const wxEventTable wxEvtHandler::sm_eventTable =
  67         { (const wxEventTable *)NULL, &wxEvtHandler::sm_eventTableEntries[0] };
  68
  69     const wxEventTableEntry wxEvtHandler::sm_eventTableEntries[] =
  70         { { 0, 0, 0,
  71     #ifdef __SGI_CC__
  72         // stupid SGI compiler --- offer aug 98
  73         0L }
  74     #else // !SGI CC
  75         NULL }
  76     #endif // SGI/!SGI
  77         };
  78
  79 #endif // !USE_SHARED_LIBRARY
  80
  81 #if wxUSE_THREADS
  82 /* To put pending event handlers */
  83 extern wxList *wxPendingEvents;
  84 extern wxCriticalSection *wxPendingEventsLocker;
  85 #endif
  86
  87 /*
  88  * General wxWindows events, covering
  89  * all interesting things that might happen (button clicking, resizing,
  90  * setting text in widgets, etc.).
  91  *
  92  * For each completely new event type, derive a new event class.
  93  *
  94  */
  95
  96 wxEvent::wxEvent(int theId)
  97 {
  98     m_eventType = wxEVT_NULL;
  99     m_eventObject = (wxObject *) NULL;
 100     m_eventHandle = (char *) NULL;
 101     m_timeStamp = 0;
 102     m_id = theId;
 103     m_skipped = FALSE;
 104     m_callbackUserData = (wxObject *) NULL;
 105     m_isCommandEvent = FALSE;
 106 }
 107
 108 /*
 109  * Command events
 110  *
 111  */
 112
 113 wxCommandEvent::wxCommandEvent(wxEventType commandType, int theId)
 114 {
 115     m_eventType = commandType;
 116     m_clientData = (char *) NULL;
 117     m_clientObject = (wxClientData *) NULL;
 118     m_extraLong = 0;
 119     m_commandInt = 0;
 120     m_id = theId;
 121     m_commandString = (char *) NULL;
 122     m_isCommandEvent = TRUE;
 123 }
 124
 125 /*
 126  * Scroll events
 127  */
 128
 129 wxScrollEvent::wxScrollEvent(wxEventType commandType,
 130                              int id,
 131                              int pos,
 132                              int orient)
 133              : wxCommandEvent(commandType, id)
 134 {
 135     m_extraLong = orient;
 136     m_commandInt = pos;
 137 }
 138
 139
 140 /*
 141  * Mouse events
 142  *
 143  */
 144
 145 wxMouseEvent::wxMouseEvent(wxEventType commandType)
 146 {
 147     m_eventType = commandType;
 148     m_metaDown = FALSE;
 149     m_altDown = FALSE;
 150     m_controlDown = FALSE;
 151     m_shiftDown = FALSE;
 152     m_leftDown = FALSE;
 153     m_rightDown = FALSE;
 154     m_middleDown = FALSE;
 155     m_x = 0;
 156     m_y = 0;
 157 }
 158
 159 // True if was a button dclick event (1 = left, 2 = middle, 3 = right)
 160 // or any button dclick event (but = -1)
 161 bool wxMouseEvent::ButtonDClick(int but) const
 162 {
 163     switch (but)
 164     {
 165         case -1:
 166             return (LeftDClick() || MiddleDClick() || RightDClick());
 167         case 1:
 168             return LeftDClick();
 169         case 2:
 170             return MiddleDClick();
 171         case 3:
 172             return RightDClick();
 173         default:
 174             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonDClick"));
 175     }
 176
 177     return FALSE;
 178 }
 179
 180 // True if was a button down event (1 = left, 2 = middle, 3 = right)
 181 // or any button down event (but = -1)
 182 bool wxMouseEvent::ButtonDown(int but) const
 183 {
 184     switch (but)
 185     {
 186         case -1:
 187             return (LeftDown() || MiddleDown() || RightDown());
 188         case 1:
 189             return LeftDown();
 190         case 2:
 191             return MiddleDown();
 192         case 3:
 193             return RightDown();
 194         default:
 195             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonDown"));
 196     }
 197
 198     return FALSE;
 199 }
 200
 201 // True if was a button up event (1 = left, 2 = middle, 3 = right)
 202 // or any button up event (but = -1)
 203 bool wxMouseEvent::ButtonUp(int but) const
 204 {
 205     switch (but) {
 206         case -1:
 207             return (LeftUp() || MiddleUp() || RightUp());
 208         case 1:
 209             return LeftUp();
 210         case 2:
 211             return MiddleUp();
 212         case 3:
 213             return RightUp();
 214         default:
 215             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonUp"));
 216     }
 217
 218     return FALSE;
 219 }
 220
 221 // True if the given button is currently changing state
 222 bool wxMouseEvent::Button(int but) const
 223 {
 224     switch (but) {
 225         case -1:
 226             return (ButtonUp(-1) || ButtonDown(-1) || ButtonDClick(-1)) ;
 227         case 1:
 228             return (LeftDown() || LeftUp() || LeftDClick());
 229         case 2:
 230             return (MiddleDown() || MiddleUp() || MiddleDClick());
 231         case 3:
 232             return (RightDown() || RightUp() || RightDClick());
 233         default:
 234             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::Button"));
 235     }
 236
 237     return FALSE;
 238 }
 239
 240 bool wxMouseEvent::ButtonIsDown(int but) const
 241 {
 242     switch (but) {
 243         case -1:
 244             return (LeftIsDown() || MiddleIsDown() || RightIsDown());
 245         case 1:
 246             return LeftIsDown();
 247         case 2:
 248             return MiddleIsDown();
 249         case 3:
 250             return RightIsDown();
 251         default:
 252             wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonIsDown"));
 253     }
 254
 255     return FALSE;
 256 }
 257
 258 // Find the logical position of the event given the DC
 259 wxPoint wxMouseEvent::GetLogicalPosition(const wxDC& dc) const
 260 {
 261     wxPoint pt(dc.DeviceToLogicalX(m_x), dc.DeviceToLogicalY(m_y));
 262     return pt;
 263 }
 264
 265
 266 /*
 267  * Keyboard events
 268  *
 269  */
 270
 271 wxKeyEvent::wxKeyEvent(wxEventType type)
 272 {
 273     m_eventType = type;
 274     m_shiftDown = FALSE;
 275     m_controlDown = FALSE;
 276     m_metaDown = FALSE;
 277     m_altDown = FALSE;
 278     m_keyCode = 0;
 279 }
 280
 281 /*
 282  * Event handler
 283  */
 284
 285 wxEvtHandler::wxEvtHandler()
 286 {
 287     m_nextHandler = (wxEvtHandler *) NULL;
 288     m_previousHandler = (wxEvtHandler *) NULL;
 289     m_enabled = TRUE;
 290     m_dynamicEvents = (wxList *) NULL;
 291     m_isWindow = FALSE;
 292 #if wxUSE_THREADS
 293     m_eventsLocker = new wxCriticalSection();
 294 #endif
 295     m_pendingEvents = (wxList *) NULL;
 296 }
 297
 298 wxEvtHandler::~wxEvtHandler()
 299 {
 300     // Takes itself out of the list of handlers
 301     if (m_previousHandler)
 302         m_previousHandler->m_nextHandler = m_nextHandler;
 303
 304     if (m_nextHandler)
 305         m_nextHandler->m_previousHandler = m_previousHandler;
 306
 307     if (m_dynamicEvents)
 308     {
 309         wxNode *node = m_dynamicEvents->First();
 310         while (node)
 311         {
 312             wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 313             if (entry->m_callbackUserData) delete entry->m_callbackUserData;
 314             delete entry;
 315             node = node->Next();
 316         }
 317         delete m_dynamicEvents;
 318     };
 319
 320     if (m_pendingEvents)
 321       delete m_pendingEvents;
 322
 323 #if wxUSE_THREADS
 324     delete m_eventsLocker;
 325 #endif
 326 }
 327
 328 #if wxUSE_THREADS
 329 bool wxEvtHandler::ProcessThreadEvent(wxEvent& event)
 330 {
 331     wxEvent *event_main;
 332     wxCriticalSectionLocker locker(*m_eventsLocker);
 333
 334     // check that we are really in a child thread
 335     wxASSERT( !wxThread::IsMain() );
 336
 337     if (m_pendingEvents == NULL)
 338       m_pendingEvents = new wxList();
 339
 340     event_main = (wxEvent *)event.GetClassInfo()->CreateObject();
 341     *event_main = event;
 342
 343     m_pendingEvents->Append(event_main);
 344
 345     wxPendingEventsLocker->Enter();
 346     wxPendingEvents->Append(this);
 347     wxPendingEventsLocker->Leave();
 348
 349     return TRUE;
 350 }
 351
 352 void wxEvtHandler::ProcessPendingEvents()
 353 {
 354     wxCriticalSectionLocker locker(*m_eventsLocker);
 355     wxNode *node = m_pendingEvents->First();
 356     wxEvent *event;
 357
 358     while (node != NULL) {
 359       event = (wxEvent *)node->Data();
 360       ProcessEvent(*event);
 361       delete node;
 362       node = m_pendingEvents->First();
 363     }
 364 }
 365 #endif
 366
 367 /*
 368  * Event table stuff
 369  */
 370
 371 bool wxEvtHandler::ProcessEvent(wxEvent& event)
 372 {
 373     // check that our flag corresponds to reality
 374     wxASSERT( m_isWindow == IsKindOf(CLASSINFO(wxWindow)) );
 375
 376     // An event handler can be enabled or disabled
 377     if ( GetEvtHandlerEnabled() )
 378     {
 379 #if wxUSE_THREADS
 380         // Check whether we are in a child thread.
 381         if (!wxThread::IsMain())
 382           return ProcessThreadEvent(event);
 383 #endif
 384         // Handle per-instance dynamic event tables first
 385
 386         if ( m_dynamicEvents && SearchDynamicEventTable(event) )
 387             return TRUE;
 388
 389         // Then static per-class event tables
 390
 391         const wxEventTable *table = GetEventTable();
 392
 393         // Try the associated validator first, if this is a window.
 394         // Problem: if the event handler of the window has been replaced,
 395         // this wxEvtHandler may no longer be a window.
 396         // Therefore validators won't be processed if the handler
 397         // has been replaced with SetEventHandler.
 398         // THIS CAN BE CURED if PushEventHandler is used instead of
 399         // SetEventHandler, and then processing will be passed down the
 400         // chain of event handlers.
 401         if ( m_isWindow )
 402         {
 403             wxWindow *win = (wxWindow *)this;
 404
 405             // Can only use the validator of the window which
 406             // is receiving the event
 407             if ( win == event.GetEventObject() )
 408             {
 409                 wxValidator *validator = win->GetValidator();
 410                 if ( validator && validator->ProcessEvent(event) )
 411                 {
 412                     return TRUE;
 413                 }
 414             }
 415         }
 416
 417         // Search upwards through the inheritance hierarchy
 418         while ( table )
 419         {
 420             if ( SearchEventTable((wxEventTable&)*table, event) )
 421                 return TRUE;
 422             table = table->baseTable;
 423         }
 424     }
 425
 426     // Try going down the event handler chain
 427     if ( GetNextHandler() )
 428     {
 429         if ( GetNextHandler()->ProcessEvent(event) )
 430             return TRUE;
 431     }
 432
 433     // Carry on up the parent-child hierarchy,
 434     // but only if event is a command event: it wouldn't
 435     // make sense for a parent to receive a child's size event, for example
 436     if ( m_isWindow && event.IsCommandEvent() )
 437     {
 438         wxWindow *win = (wxWindow *)this;
 439         wxWindow *parent = win->GetParent();
 440         if (parent && !parent->IsBeingDeleted())
 441             return parent->GetEventHandler()->ProcessEvent(event);
 442     }
 443
 444     // Last try - application object.
 445     if ( wxTheApp && (this != wxTheApp) )
 446     {
 447         // Special case: don't pass wxEVT_IDLE to wxApp, since it'll always
 448         // swallow it. wxEVT_IDLE is sent explicitly to wxApp so it will be
 449         // processed appropriately via SearchEventTable.
 450         if ( event.GetEventType() != wxEVT_IDLE )
 451         {
 452             if ( wxTheApp->ProcessEvent(event) )
 453                 return TRUE;
 454         }
 455     }
 456
 457     return FALSE;
 458 }
 459
 460 bool wxEvtHandler::SearchEventTable(wxEventTable& table, wxEvent& event)
 461 {
 462     int i = 0;
 463     int commandId = event.GetId();
 464
 465     // BC++ doesn't like while (table.entries[i].m_fn)
 466
 467 #ifdef __SC__
 468     while (table.entries[i].m_fn != 0)
 469 #else
 470     while (table.entries[i].m_fn != 0L)
 471 #endif
 472     {
 473         if ((event.GetEventType() == table.entries[i].m_eventType) &&
 474                 (table.entries[i].m_id == -1 || // Match, if event spec says any id will do (id == -1)
 475                  (table.entries[i].m_lastId == -1 && commandId == table.entries[i].m_id) ||
 476                  (table.entries[i].m_lastId != -1 &&
 477                   (commandId >= table.entries[i].m_id && commandId <= table.entries[i].m_lastId))))
 478         {
 479             event.Skip(FALSE);
 480             event.m_callbackUserData = table.entries[i].m_callbackUserData;
 481
 482             (this->*((wxEventFunction) (table.entries[i].m_fn)))(event);
 483
 484             if ( event.GetSkipped() )
 485                 return FALSE;
 486             else
 487                 return TRUE;
 488         }
 489         i++;
 490     }
 491     return FALSE;
 492 }
 493 void wxEvtHandler::Connect( int id, int lastId,
 494                             wxEventType eventType,
 495                             wxObjectEventFunction func,
 496                             wxObject *userData )
 497 {
 498     wxEventTableEntry *entry = new wxEventTableEntry;
 499     entry->m_id = id;
 500     entry->m_lastId = lastId;
 501     entry->m_eventType = eventType;
 502     entry->m_fn = func;
 503     entry->m_callbackUserData = userData;
 504
 505     if (!m_dynamicEvents)
 506         m_dynamicEvents = new wxList;
 507
 508     m_dynamicEvents->Append( (wxObject*) entry );
 509 }
 510
 511 bool wxEvtHandler::SearchDynamicEventTable( wxEvent& event )
 512 {
 513     wxCHECK_MSG( m_dynamicEvents, FALSE,
 514                  _T("caller should check that we have dynamic events") );
 515
 516     int commandId = event.GetId();
 517
 518     wxNode *node = m_dynamicEvents->First();
 519     while (node)
 520     {
 521         wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 522
 523         if (entry->m_fn)
 524         {
 525             // Match, if event spec says any id will do (id == -1)
 526             if ( (event.GetEventType() == entry->m_eventType) &&
 527                  (entry->m_id == -1 ||
 528                   (entry->m_lastId == -1 && commandId == entry->m_id) ||
 529                   (entry->m_lastId != -1 &&
 530                   (commandId >= entry->m_id && commandId <= entry->m_lastId))) )
 531             {
 532                 event.Skip(FALSE);
 533                 event.m_callbackUserData = entry->m_callbackUserData;
 534
 535                 (this->*((wxEventFunction) (entry->m_fn)))(event);
 536
 537                 if (event.GetSkipped())
 538                     return FALSE;
 539                 else
 540                     return TRUE;
 541             }
 542         }
 543         node = node->Next();
 544     }
 545     return FALSE;
 546 };
 547
 548 #if WXWIN_COMPATIBILITY
 549 bool wxEvtHandler::OnClose()
 550 {
 551     if (GetNextHandler())
 552         return GetNextHandler()->OnClose();
 553     else
 554         return FALSE;
 555 }
 556 #endif // WXWIN_COMPATIBILITY
 557
 558 // Find a window with the focus, that is also a descendant of the given window.
 559 // This is used to determine the window to initially send commands to.
 560 wxWindow* wxFindFocusDescendant(wxWindow* ancestor)
 561 {
 562     // Process events starting with the window with the focus, if any.
 563     wxWindow* focusWin = wxWindow::FindFocus();
 564     wxWindow* win = focusWin;
 565
 566     // Check if this is a descendant of this frame.
 567     // If not, win will be set to NULL.
 568     while (win)
 569     {
 570         if (win == ancestor)
 571             break;
 572         else
 573             win = win->GetParent();
 574     }
 575     if (win == (wxWindow*) NULL)
 576         focusWin = (wxWindow*) NULL;
 577
 578     return focusWin;
 579 }
 580