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 /*
  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 }
 100
 101 /*
 102  * Command events
 103  *
 104  */
 105
 106 wxCommandEvent::wxCommandEvent(wxEventType commandType, int theId)
 107 {
 108     m_eventType = commandType;
 109     m_clientData = (char *) NULL;
 110     m_clientObject = (wxClientData *) NULL;
 111     m_extraLong = 0;
 112     m_commandInt = 0;
 113     m_id = theId;
 114     m_commandString = (char *) NULL;
 115 }
 116
 117 /*
 118  * Scroll events
 119  */
 120
 121 wxScrollEvent::wxScrollEvent(wxEventType commandType,
 122                              int id,
 123                              int pos,
 124                              int orient)
 125              : wxCommandEvent(commandType, id)
 126 {
 127     m_extraLong = orient;
 128     m_commandInt = pos;
 129 }
 130
 131
 132 /*
 133  * Mouse events
 134  *
 135  */
 136
 137 wxMouseEvent::wxMouseEvent(wxEventType commandType)
 138 {
 139     m_eventType = commandType;
 140     m_metaDown = FALSE;
 141     m_altDown = FALSE;
 142     m_controlDown = FALSE;
 143     m_shiftDown = FALSE;
 144     m_leftDown = FALSE;
 145     m_rightDown = FALSE;
 146     m_middleDown = FALSE;
 147     m_x = 0;
 148     m_y = 0;
 149 }
 150
 151 // True if was a button dclick event (1 = left, 2 = middle, 3 = right)
 152 // or any button dclick event (but = -1)
 153 bool wxMouseEvent::ButtonDClick(int but) const
 154 {
 155     switch (but)
 156     {
 157         case -1:
 158             return (LeftDClick() || MiddleDClick() || RightDClick());
 159         case 1:
 160             return LeftDClick();
 161         case 2:
 162             return MiddleDClick();
 163         case 3:
 164             return RightDClick();
 165         default:
 166             wxFAIL_MSG("invalid parameter in wxMouseEvent::ButtonDClick");
 167     }
 168
 169     return FALSE;
 170 }
 171
 172 // True if was a button down event (1 = left, 2 = middle, 3 = right)
 173 // or any button down event (but = -1)
 174 bool wxMouseEvent::ButtonDown(int but) const
 175 {
 176     switch (but)
 177     {
 178         case -1:
 179             return (LeftDown() || MiddleDown() || RightDown());
 180         case 1:
 181             return LeftDown();
 182         case 2:
 183             return MiddleDown();
 184         case 3:
 185             return RightDown();
 186         default:
 187             wxFAIL_MSG("invalid parameter in wxMouseEvent::ButtonDown");
 188     }
 189
 190     return FALSE;
 191 }
 192
 193 // True if was a button up event (1 = left, 2 = middle, 3 = right)
 194 // or any button up event (but = -1)
 195 bool wxMouseEvent::ButtonUp(int but) const
 196 {
 197     switch (but) {
 198         case -1:
 199             return (LeftUp() || MiddleUp() || RightUp());
 200         case 1:
 201             return LeftUp();
 202         case 2:
 203             return MiddleUp();
 204         case 3:
 205             return RightUp();
 206         default:
 207             wxFAIL_MSG("invalid parameter in wxMouseEvent::ButtonUp");
 208     }
 209
 210     return FALSE;
 211 }
 212
 213 // True if the given button is currently changing state
 214 bool wxMouseEvent::Button(int but) const
 215 {
 216     switch (but) {
 217         case -1:
 218             return (ButtonUp(-1) || ButtonDown(-1) || ButtonDClick(-1)) ;
 219         case 1:
 220             return (LeftDown() || LeftUp() || LeftDClick());
 221         case 2:
 222             return (MiddleDown() || MiddleUp() || MiddleDClick());
 223         case 3:
 224             return (RightDown() || RightUp() || RightDClick());
 225         default:
 226             wxFAIL_MSG("invalid parameter in wxMouseEvent::Button");
 227     }
 228
 229     return FALSE;
 230 }
 231
 232 bool wxMouseEvent::ButtonIsDown(int but) const
 233 {
 234     switch (but) {
 235         case -1:
 236             return (LeftIsDown() || MiddleIsDown() || RightIsDown());
 237         case 1:
 238             return LeftIsDown();
 239         case 2:
 240             return MiddleIsDown();
 241         case 3:
 242             return RightIsDown();
 243         default:
 244             wxFAIL_MSG("invalid parameter in wxMouseEvent::ButtonIsDown");
 245     }
 246
 247     return FALSE;
 248 }
 249
 250 // Find the logical position of the event given the DC
 251 wxPoint wxMouseEvent::GetLogicalPosition(const wxDC& dc) const
 252 {
 253     wxPoint pt(dc.DeviceToLogicalX(m_x), dc.DeviceToLogicalY(m_y));
 254     return pt;
 255 }
 256
 257
 258 /*
 259  * Keyboard events
 260  *
 261  */
 262
 263 wxKeyEvent::wxKeyEvent(wxEventType type)
 264 {
 265     m_eventType = type;
 266     m_shiftDown = FALSE;
 267     m_controlDown = FALSE;
 268     m_metaDown = FALSE;
 269     m_altDown = FALSE;
 270     m_keyCode = 0;
 271 }
 272
 273 /*
 274  * Event handler
 275  */
 276
 277 wxEvtHandler::wxEvtHandler()
 278 {
 279     m_nextHandler = (wxEvtHandler *) NULL;
 280     m_previousHandler = (wxEvtHandler *) NULL;
 281     m_enabled = TRUE;
 282     m_dynamicEvents = (wxList *) NULL;
 283 }
 284
 285 wxEvtHandler::~wxEvtHandler()
 286 {
 287     // Takes itself out of the list of handlers
 288     if (m_previousHandler)
 289         m_previousHandler->m_nextHandler = m_nextHandler;
 290
 291     if (m_nextHandler)
 292         m_nextHandler->m_previousHandler = m_previousHandler;
 293
 294     if (m_dynamicEvents)
 295     {
 296         wxNode *node = m_dynamicEvents->First();
 297         while (node)
 298         {
 299             wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 300             if (entry->m_callbackUserData) delete entry->m_callbackUserData;
 301             delete entry;
 302             node = node->Next();
 303         }
 304         delete m_dynamicEvents;
 305     };
 306 }
 307
 308 /*
 309  * Event table stuff
 310  */
 311
 312 bool wxEvtHandler::ProcessEvent(wxEvent& event)
 313 {
 314     bool isWindow = IsKindOf(CLASSINFO(wxWindow));
 315
 316     // An event handler can be enabled or disabled
 317     if ( GetEvtHandlerEnabled() )
 318     {
 319         // Handle per-instance dynamic event tables first
 320
 321         if (SearchDynamicEventTable( event ))
 322             return TRUE;
 323
 324         // Then static per-class event tables
 325
 326         const wxEventTable *table = GetEventTable();
 327
 328         // Try the associated validator first, if this is a window.
 329         // Problem: if the event handler of the window has been replaced,
 330         // this wxEvtHandler may no longer be a window.
 331         // Therefore validators won't be processed if the handler
 332         // has been replaced with SetEventHandler.
 333         // THIS CAN BE CURED if PushEventHandler is used instead of
 334         // SetEventHandler, and then processing will be passed down the
 335         // chain of event handlers.
 336         if ( isWindow )
 337         {
 338             wxWindow *win = (wxWindow *)this;
 339
 340             // Can only use the validator of the window which
 341             // is receiving the event
 342             if ( (win == event.GetEventObject()) &&
 343                     win->GetValidator() &&
 344                     win->GetValidator()->ProcessEvent(event))
 345             {
 346                 return TRUE;
 347             }
 348         }
 349
 350         // Search upwards through the inheritance hierarchy
 351         while (table)
 352         {
 353             if (SearchEventTable((wxEventTable&)*table, event))
 354                 return TRUE;
 355             table = table->baseTable;
 356         }
 357     }
 358
 359     // Try going down the event handler chain
 360     if ( GetNextHandler() )
 361     {
 362         if ( GetNextHandler()->ProcessEvent(event) )
 363             return TRUE;
 364     }
 365
 366     // Carry on up the parent-child hierarchy,
 367     // but only if event is a command event: it wouldn't
 368     // make sense for a parent to receive a child's size event, for example
 369     if ( isWindow && event.IsKindOf(CLASSINFO(wxCommandEvent)) )
 370     {
 371         wxWindow *win = (wxWindow *)this;
 372         wxWindow *parent = win->GetParent();
 373         if (parent && !parent->IsBeingDeleted())
 374             return win->GetParent()->GetEventHandler()->ProcessEvent(event);
 375     }
 376
 377     // Last try - application object.
 378     // Special case: don't pass wxEVT_IDLE to wxApp, since it'll always swallow
 379     // it. wxEVT_IDLE is sent explicitly to wxApp so it will be processed
 380     // appropriately via SearchEventTable.
 381     if ( wxTheApp && (this != wxTheApp) && (event.GetEventType() != wxEVT_IDLE)
 382        )
 383     {
 384         if ( wxTheApp->ProcessEvent(event) )
 385             return TRUE;
 386     }
 387
 388     return FALSE;
 389 }
 390
 391 bool wxEvtHandler::SearchEventTable(wxEventTable& table, wxEvent& event)
 392 {
 393     int i = 0;
 394     int commandId = event.GetId();
 395
 396     // BC++ doesn't like while (table.entries[i].m_fn)
 397
 398 #ifdef __SC__
 399     while (table.entries[i].m_fn != 0)
 400 #else
 401     while (table.entries[i].m_fn != 0L)
 402 #endif
 403     {
 404         if ((event.GetEventType() == table.entries[i].m_eventType) &&
 405                 (table.entries[i].m_id == -1 || // Match, if event spec says any id will do (id == -1)
 406                  (table.entries[i].m_lastId == -1 && commandId == table.entries[i].m_id) ||
 407                  (table.entries[i].m_lastId != -1 &&
 408                   (commandId >= table.entries[i].m_id && commandId <= table.entries[i].m_lastId))))
 409         {
 410             event.Skip(FALSE);
 411             event.m_callbackUserData = table.entries[i].m_callbackUserData;
 412
 413             (this->*((wxEventFunction) (table.entries[i].m_fn)))(event);
 414
 415             if ( event.GetSkipped() )
 416                 return FALSE;
 417             else
 418                 return TRUE;
 419         }
 420         i++;
 421     }
 422     return FALSE;
 423 }
 424
 425 void wxEvtHandler::Connect( int id, int lastId,
 426                             wxEventType eventType,
 427                             wxObjectEventFunction func,
 428                             wxObject *userData )
 429 {
 430     wxEventTableEntry *entry = new wxEventTableEntry;
 431     entry->m_id = id;
 432     entry->m_lastId = lastId;
 433     entry->m_eventType = eventType;
 434     entry->m_fn = func;
 435     entry->m_callbackUserData = userData;
 436
 437     if (!m_dynamicEvents)
 438         m_dynamicEvents = new wxList;
 439
 440     m_dynamicEvents->Append( (wxObject*) entry );
 441 }
 442
 443 bool wxEvtHandler::SearchDynamicEventTable( wxEvent& event )
 444 {
 445     if (!m_dynamicEvents) return FALSE;
 446
 447     int commandId = event.GetId();
 448
 449     wxNode *node = m_dynamicEvents->First();
 450     while (node)
 451     {
 452         wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
 453
 454         if (entry->m_fn)
 455         {
 456             // Match, if event spec says any id will do (id == -1)
 457             if ( (event.GetEventType() == entry->m_eventType) &&
 458                  (entry->m_id == -1 ||
 459                   (entry->m_lastId == -1 && commandId == entry->m_id) ||
 460                   (entry->m_lastId != -1 &&
 461                   (commandId >= entry->m_id && commandId <= entry->m_lastId))) )
 462             {
 463                 event.Skip(FALSE);
 464                 event.m_callbackUserData = entry->m_callbackUserData;
 465
 466                 (this->*((wxEventFunction) (entry->m_fn)))(event);
 467
 468                 if (event.GetSkipped())
 469                     return FALSE;
 470                 else
 471                     return TRUE;
 472             }
 473         }
 474         node = node->Next();
 475     }
 476     return FALSE;
 477 };
 478
 479 bool wxEvtHandler::OnClose()
 480 {
 481     if (GetNextHandler())
 482         return GetNextHandler()->OnClose();
 483     else
 484         return FALSE;
 485 }