src/mac/carbon/toplevel.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        mac/toplevel.cpp
   3 // Purpose:     implements wxTopLevelWindow for MSW
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     24.09.01
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2001 SciTech Software, Inc. (www.scitechsoft.com)
   9 // License:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "toplevel.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/app.h"
  33     #include "wx/toplevel.h"
  34     #include "wx/frame.h"
  35     #include "wx/string.h"
  36     #include "wx/log.h"
  37     #include "wx/intl.h"
  38 #endif //WX_PRECOMP
  39
  40 #include "wx/mac/uma.h"
  41 #include "wx/mac/aga.h"
  42 #include "wx/tooltip.h"
  43 #include "wx/dnd.h"
  44
  45 #define wxMAC_DEBUG_REDRAW 0
  46 #ifndef wxMAC_DEBUG_REDRAW
  47 #define wxMAC_DEBUG_REDRAW 0
  48 #endif
  49
  50 // ----------------------------------------------------------------------------
  51 // globals
  52 // ----------------------------------------------------------------------------
  53
  54 // list of all frames and modeless dialogs
  55 wxWindowList       wxModelessWindows;
  56
  57 // double click testing
  58 static   Point     gs_lastWhere;
  59 static   long      gs_lastWhen = 0;
  60
  61 // cursor stuff
  62 extern   int       wxBusyCursorCount;
  63
  64
  65 // ============================================================================
  66 // wxTopLevelWindowMac implementation
  67 // ============================================================================
  68
  69 // ---------------------------------------------------------------------------
  70 // wxWindowMac utility functions
  71 // ---------------------------------------------------------------------------
  72
  73 // Find an item given the Macintosh Window Reference
  74
  75 wxList *wxWinMacWindowList = NULL;
  76 wxTopLevelWindowMac *wxFindWinFromMacWindow(WXWindow inWindowRef)
  77 {
  78     wxNode *node = wxWinMacWindowList->Find((long)inWindowRef);
  79     if (!node)
  80         return NULL;
  81     return (wxTopLevelWindowMac *)node->Data();
  82 }
  83
  84 void wxAssociateWinWithMacWindow(WXWindow inWindowRef, wxTopLevelWindowMac *win)
  85 {
  86     // adding NULL WindowRef is (first) surely a result of an error and
  87     // (secondly) breaks menu command processing
  88     wxCHECK_RET( inWindowRef != (WindowRef) NULL, "attempt to add a NULL WindowRef to window list" );
  89
  90     if ( !wxWinMacWindowList->Find((long)inWindowRef) )
  91         wxWinMacWindowList->Append((long)inWindowRef, win);
  92 }
  93
  94 void wxRemoveMacWindowAssociation(wxTopLevelWindowMac *win)
  95 {
  96     wxWinMacWindowList->DeleteObject(win);
  97 }
  98
  99
 100 // ----------------------------------------------------------------------------
 101 // wxTopLevelWindowMac creation
 102 // ----------------------------------------------------------------------------
 103
 104 WXHWND wxTopLevelWindowMac::s_macWindowInUpdate = NULL;
 105
 106 void wxTopLevelWindowMac::Init()
 107 {
 108     m_iconized =
 109     m_maximizeOnShow = FALSE;
 110     m_macNoEraseUpdateRgn = NewRgn() ;
 111     m_macNeedsErasing = false ;
 112     m_macWindow = NULL ;
 113 }
 114
 115 class wxMacDeferredWindowDeleter : public wxObject
 116 {
 117 public :
 118     wxMacDeferredWindowDeleter( WindowRef windowRef )
 119     {
 120         m_macWindow = windowRef ;
 121     }
 122     virtual ~wxMacDeferredWindowDeleter()
 123     {
 124         UMADisposeWindow( (WindowRef) m_macWindow ) ;
 125     }
 126  protected :
 127     WindowRef m_macWindow ;
 128 } ;
 129
 130 bool wxTopLevelWindowMac::Create(wxWindow *parent,
 131                                  wxWindowID id,
 132                                  const wxString& title,
 133                                  const wxPoint& pos,
 134                                  const wxSize& size,
 135                                  long style,
 136                                  const wxString& name)
 137 {
 138     // init our fields
 139     Init();
 140
 141     m_windowStyle = style;
 142
 143     SetName(name);
 144
 145     m_windowId = id == -1 ? NewControlId() : id;
 146
 147     wxTopLevelWindows.Append(this);
 148
 149     if ( parent )
 150         parent->AddChild(this);
 151
 152     return TRUE;
 153 }
 154
 155 wxTopLevelWindowMac::~wxTopLevelWindowMac()
 156 {
 157     if ( m_macWindow )
 158     {
 159         wxToolTip::NotifyWindowDelete(m_macWindow) ;
 160         wxPendingDelete.Append( new wxMacDeferredWindowDeleter( (WindowRef) m_macWindow ) ) ;
 161     }
 162
 163     wxRemoveMacWindowAssociation( this ) ;
 164
 165     wxTopLevelWindows.DeleteObject(this);
 166
 167     if ( wxModelessWindows.Find(this) )
 168         wxModelessWindows.DeleteObject(this);
 169
 170     // If this is the last top-level window, exit.
 171     if ( wxTheApp && (wxTopLevelWindows.Number() == 0) )
 172     {
 173         wxTheApp->SetTopWindow(NULL);
 174
 175         if ( wxTheApp->GetExitOnFrameDelete() )
 176         {
 177           wxTheApp->ExitMainLoop() ;
 178         }
 179     }
 180     DisposeRgn( (RgnHandle) m_macNoEraseUpdateRgn ) ;
 181 }
 182
 183
 184 // ----------------------------------------------------------------------------
 185 // wxTopLevelWindowMac maximize/minimize
 186 // ----------------------------------------------------------------------------
 187
 188 void wxTopLevelWindowMac::Maximize(bool maximize)
 189 {
 190     // not available on mac
 191 }
 192
 193 bool wxTopLevelWindowMac::IsMaximized() const
 194 {
 195     return false ;
 196 }
 197
 198 void wxTopLevelWindowMac::Iconize(bool iconize)
 199 {
 200     // not available on mac
 201 }
 202
 203 bool wxTopLevelWindowMac::IsIconized() const
 204 {
 205     // mac dialogs cannot be iconized
 206     return FALSE;
 207 }
 208
 209 void wxTopLevelWindowMac::Restore()
 210 {
 211     // not available on mac
 212 }
 213
 214 // ----------------------------------------------------------------------------
 215 // wxTopLevelWindowMac misc
 216 // ----------------------------------------------------------------------------
 217
 218 void wxTopLevelWindowMac::SetIcon(const wxIcon& icon)
 219 {
 220     // this sets m_icon
 221     wxTopLevelWindowBase::SetIcon(icon);
 222 }
 223
 224 void  wxTopLevelWindowMac::MacCreateRealWindow( const wxString& title,
 225            const wxPoint& pos,
 226            const wxSize& size,
 227            long style,
 228            const wxString& name )
 229 {
 230   SetName(name);
 231   m_windowStyle = style;
 232   m_isShown = FALSE;
 233
 234   // create frame.
 235
 236     Rect theBoundsRect;
 237
 238   m_x = (int)pos.x;
 239   m_y = (int)pos.y;
 240   if ( m_y < 50 )
 241     m_y = 50 ;
 242   if ( m_x < 20 )
 243     m_x = 20 ;
 244
 245   m_width = size.x;
 246     if (m_width == -1)
 247         m_width = 20;
 248   m_height = size.y;
 249     if (m_height == -1)
 250         m_height = 20;
 251
 252     ::SetRect(&theBoundsRect, m_x, m_y , m_x + m_width, m_y + m_height);
 253
 254     // translate the window attributes in the appropriate window class and attributes
 255
 256     WindowClass wclass = 0;
 257     WindowAttributes attr = kWindowNoAttributes ;
 258
 259     if ( HasFlag( wxFRAME_TOOL_WINDOW) )
 260     {
 261         if (
 262             HasFlag( wxMINIMIZE_BOX ) || HasFlag( wxMAXIMIZE_BOX ) ||
 263             HasFlag( wxSYSTEM_MENU ) || HasFlag( wxCAPTION ) ||
 264             HasFlag(wxTINY_CAPTION_HORIZ) ||  HasFlag(wxTINY_CAPTION_VERT)
 265              )
 266         {
 267             wclass = kFloatingWindowClass ;
 268             if ( HasFlag(wxTINY_CAPTION_VERT) )
 269             {
 270                 attr |= kWindowSideTitlebarAttribute ;
 271             }
 272         }
 273         else
 274         {
 275             wclass = kPlainWindowClass ;
 276         }
 277     }
 278     else if ( HasFlag( wxCAPTION ) )
 279     {
 280         if ( HasFlag( wxDIALOG_MODAL ) )
 281         {
 282             wclass = kDocumentWindowClass ; // kMovableModalWindowClass ;
 283         }
 284         else
 285         {
 286             wclass = kDocumentWindowClass ;
 287         }
 288     }
 289     else
 290     {
 291         if ( HasFlag( wxMINIMIZE_BOX ) || HasFlag( wxMAXIMIZE_BOX ) ||
 292              HasFlag( wxSYSTEM_MENU ) )
 293         {
 294             wclass = kDocumentWindowClass ;
 295         }
 296         else
 297         {
 298             wclass = kPlainWindowClass ;
 299         }
 300     }
 301
 302     if ( HasFlag( wxMINIMIZE_BOX ) || HasFlag( wxMAXIMIZE_BOX ) )
 303     {
 304         attr |= kWindowFullZoomAttribute ;
 305         attr |= kWindowCollapseBoxAttribute ;
 306     }
 307     if ( HasFlag( wxRESIZE_BORDER ) )
 308     {
 309         attr |= kWindowResizableAttribute ;
 310     }
 311     if ( HasFlag( wxSYSTEM_MENU ) )
 312     {
 313         attr |= kWindowCloseBoxAttribute ;
 314     }
 315
 316     ::CreateNewWindow( wclass , attr , &theBoundsRect , (WindowRef*)&m_macWindow ) ;
 317     wxAssociateWinWithMacWindow( m_macWindow , this ) ;
 318     wxString label ;
 319     if( wxApp::s_macDefaultEncodingIsPC )
 320         label = wxMacMakeMacStringFromPC( title ) ;
 321     else
 322         label = title ;
 323     UMASetWTitleC( (WindowRef)m_macWindow , label ) ;
 324     ::CreateRootControl( (WindowRef)m_macWindow , (ControlHandle*)&m_macRootControl ) ;
 325
 326     m_macFocus = NULL ;
 327 }
 328
 329 void wxTopLevelWindowMac::MacGetPortParams(WXPOINTPTR localOrigin, WXRECTPTR clipRect, WXHWND *window  , wxWindowMac** rootwin)
 330 {
 331     ((Point*)localOrigin)->h = 0;
 332     ((Point*)localOrigin)->v = 0;
 333     ((Rect*)clipRect)->left = 0;
 334     ((Rect*)clipRect)->top = 0;
 335     ((Rect*)clipRect)->right = m_width;
 336     ((Rect*)clipRect)->bottom = m_height;
 337     *window = m_macWindow ;
 338     *rootwin = this ;
 339 }
 340
 341 void wxTopLevelWindowMac::Clear()
 342 {
 343   wxWindow::Clear() ;
 344 }
 345
 346 WXWidget wxTopLevelWindowMac::MacGetContainerForEmbedding()
 347 {
 348     return m_macRootControl ;
 349 }
 350
 351
 352 void wxTopLevelWindowMac::MacUpdate( long timestamp)
 353 {
 354
 355     wxMacPortStateHelper help( (GrafPtr) GetWindowPort( (WindowRef) m_macWindow) ) ;
 356
 357     BeginUpdate( (WindowRef)m_macWindow ) ;
 358
 359     RgnHandle       updateRgn = NewRgn();
 360     RgnHandle       diffRgn = NewRgn() ;
 361     if ( updateRgn && diffRgn )
 362     {
 363         GetPortVisibleRegion( GetWindowPort( (WindowRef)m_macWindow ), updateRgn );
 364         DiffRgn( updateRgn , (RgnHandle) m_macNoEraseUpdateRgn , diffRgn ) ;
 365         if ( !EmptyRgn( updateRgn ) )
 366         {
 367             MacRedraw( updateRgn , timestamp , m_macNeedsErasing || !EmptyRgn( diffRgn )  ) ;
 368         }
 369     }
 370     if ( updateRgn )
 371         DisposeRgn( updateRgn );
 372     if ( diffRgn )
 373         DisposeRgn( diffRgn );
 374     EndUpdate( (WindowRef)m_macWindow ) ;
 375     SetEmptyRgn( (RgnHandle) m_macNoEraseUpdateRgn ) ;
 376     m_macNeedsErasing = false ;
 377 }
 378
 379
 380 // Raise the window to the top of the Z order
 381 void wxTopLevelWindowMac::Raise()
 382 {
 383     ::BringToFront( (WindowRef)m_macWindow ) ;
 384 }
 385
 386 // Lower the window to the bottom of the Z order
 387 void wxTopLevelWindowMac::Lower()
 388 {
 389     ::SendBehind( (WindowRef)m_macWindow , NULL ) ;
 390 }
 391
 392 void wxTopLevelWindowMac::MacFireMouseEvent( WXEVENTREF evr )
 393 {
 394     EventRecord *ev = (EventRecord*) evr ;
 395     wxMouseEvent event(wxEVT_LEFT_DOWN);
 396     bool isDown = !(ev->modifiers & btnState) ; // 1 is for up
 397     bool controlDown = ev->modifiers & controlKey ; // for simulating right mouse
 398
 399     event.m_leftDown = isDown && !controlDown;
 400
 401     event.m_middleDown = FALSE;
 402     event.m_rightDown = isDown && controlDown;
 403
 404     if ( ev->what == mouseDown )
 405     {
 406         if ( controlDown )
 407             event.SetEventType(wxEVT_RIGHT_DOWN ) ;
 408         else
 409             event.SetEventType(wxEVT_LEFT_DOWN ) ;
 410     }
 411     else if ( ev->what == mouseUp )
 412     {
 413         if ( controlDown )
 414             event.SetEventType(wxEVT_RIGHT_UP ) ;
 415         else
 416             event.SetEventType(wxEVT_LEFT_UP ) ;
 417     }
 418     else
 419     {
 420         event.SetEventType(wxEVT_MOTION ) ;
 421     }
 422
 423     event.m_shiftDown = ev->modifiers & shiftKey;
 424     event.m_controlDown = ev->modifiers & controlKey;
 425     event.m_altDown = ev->modifiers & optionKey;
 426     event.m_metaDown = ev->modifiers & cmdKey;
 427
 428     Point       localwhere = ev->where ;
 429
 430     GrafPtr     port ;
 431     ::GetPort( &port ) ;
 432     ::SetPort( UMAGetWindowPort( (WindowRef)m_macWindow ) ) ;
 433     ::GlobalToLocal( &localwhere ) ;
 434     ::SetPort( port ) ;
 435
 436     if ( ev->what == mouseDown )
 437     {
 438         if ( ev->when - gs_lastWhen <= GetDblTime() )
 439         {
 440             if ( abs( localwhere.h - gs_lastWhere.h ) < 3 && abs( localwhere.v - gs_lastWhere.v ) < 3 )
 441             {
 442                 // This is not right if the second mouse down
 443                 // event occured in a differen window. We
 444                 // correct this in MacDispatchMouseEvent.
 445                 if ( controlDown )
 446                     event.SetEventType(wxEVT_RIGHT_DCLICK ) ;
 447                 else
 448                     event.SetEventType(wxEVT_LEFT_DCLICK ) ;
 449             }
 450             gs_lastWhen = 0 ;
 451         }
 452         else
 453         {
 454             gs_lastWhen = ev->when ;
 455         }
 456         gs_lastWhere = localwhere ;
 457     }
 458
 459     event.m_x = localwhere.h;
 460     event.m_y = localwhere.v;
 461     event.m_x += m_x;
 462     event.m_y += m_y;
 463
 464     event.m_timeStamp = ev->when;
 465     event.SetEventObject(this);
 466     if ( wxTheApp->s_captureWindow )
 467     {
 468         int x = event.m_x ;
 469         int y = event.m_y ;
 470         wxTheApp->s_captureWindow->ScreenToClient( &x , &y ) ;
 471         event.m_x = x ;
 472         event.m_y = y ;
 473         event.SetEventObject( wxTheApp->s_captureWindow ) ;
 474         wxTheApp->s_captureWindow->GetEventHandler()->ProcessEvent( event ) ;
 475
 476         if ( ev->what == mouseUp )
 477         {
 478             wxTheApp->s_captureWindow = NULL ;
 479             if ( wxBusyCursorCount == 0 )
 480             {
 481                 m_cursor.MacInstall() ;
 482             }
 483         }
 484     }
 485     else
 486     {
 487         MacDispatchMouseEvent( event ) ;
 488     }
 489 }
 490
 491 void wxTopLevelWindowMac::MacMouseDown( WXEVENTREF ev , short part)
 492 {
 493     MacFireMouseEvent( ev ) ;
 494 }
 495
 496 void wxTopLevelWindowMac::MacMouseUp( WXEVENTREF ev , short part)
 497 {
 498     switch (part)
 499     {
 500         case inContent:
 501             {
 502                 MacFireMouseEvent( ev ) ;
 503             }
 504             break ;
 505     }
 506 }
 507
 508 void wxTopLevelWindowMac::MacMouseMoved( WXEVENTREF ev , short part)
 509 {
 510     switch (part)
 511     {
 512         case inContent:
 513             {
 514                 MacFireMouseEvent( ev ) ;
 515             }
 516             break ;
 517     }
 518 }
 519 void wxTopLevelWindowMac::MacActivate( WXEVENTREF ev , bool inIsActivating )
 520 {
 521     wxActivateEvent event(wxEVT_ACTIVATE, inIsActivating , m_windowId);
 522     event.m_timeStamp = ((EventRecord*)ev)->when ;
 523     event.SetEventObject(this);
 524
 525     GetEventHandler()->ProcessEvent(event);
 526
 527     UMAHighlightAndActivateWindow( (WindowRef)m_macWindow , inIsActivating ) ;
 528
 529     MacSuperEnabled( inIsActivating ) ;
 530 }
 531
 532 void wxTopLevelWindowMac::MacKeyDown( WXEVENTREF ev )
 533 {
 534 }
 535
 536 void wxTopLevelWindowMac::SetTitle(const wxString& title)
 537 {
 538     wxWindow::SetTitle( title ) ;
 539
 540     wxString label ;
 541
 542     if( wxApp::s_macDefaultEncodingIsPC )
 543         label = wxMacMakeMacStringFromPC( m_label ) ;
 544     else
 545         label = m_label ;
 546
 547     UMASetWTitleC( (WindowRef)m_macWindow , label ) ;
 548 }
 549
 550 bool wxTopLevelWindowMac::Show(bool show)
 551 {
 552     if ( !wxWindow::Show(show) )
 553         return FALSE;
 554
 555     if (show)
 556     {
 557       ::ShowWindow( (WindowRef)m_macWindow ) ;
 558       ::SelectWindow( (WindowRef)m_macWindow ) ;
 559       // no need to generate events here, they will get them triggered by macos
 560       // actually they should be , but apparently they are not
 561       wxSize size(m_width, m_height);
 562       wxSizeEvent event(size, m_windowId);
 563       event.SetEventObject(this);
 564       GetEventHandler()->ProcessEvent(event);
 565     }
 566     else
 567     {
 568       ::HideWindow( (WindowRef)m_macWindow ) ;
 569     }
 570
 571     if ( !show )
 572     {
 573     }
 574     else
 575     {
 576         Refresh() ;
 577     }
 578
 579     return TRUE;
 580 }
 581
 582 void wxTopLevelWindowMac::DoMoveWindow(int x, int y, int width, int height)
 583 {
 584     int former_x = m_x ;
 585     int former_y = m_y ;
 586     int former_w = m_width ;
 587     int former_h = m_height ;
 588
 589   int actualWidth = width;
 590   int actualHeight = height;
 591   int actualX = x;
 592   int actualY = y;
 593
 594     if ((m_minWidth != -1) && (actualWidth < m_minWidth))
 595         actualWidth = m_minWidth;
 596     if ((m_minHeight != -1) && (actualHeight < m_minHeight))
 597         actualHeight = m_minHeight;
 598     if ((m_maxWidth != -1) && (actualWidth > m_maxWidth))
 599         actualWidth = m_maxWidth;
 600     if ((m_maxHeight != -1) && (actualHeight > m_maxHeight))
 601         actualHeight = m_maxHeight;
 602
 603     bool doMove = false ;
 604     bool doResize = false ;
 605
 606     if ( actualX != former_x || actualY != former_y )
 607     {
 608         doMove = true ;
 609     }
 610     if ( actualWidth != former_w || actualHeight != former_h )
 611     {
 612         doResize = true ;
 613     }
 614
 615     if ( doMove || doResize )
 616     {
 617         m_x = actualX ;
 618         m_y = actualY ;
 619         m_width = actualWidth ;
 620         m_height = actualHeight ;
 621
 622         if ( doMove )
 623             ::MoveWindow((WindowRef)m_macWindow, m_x, m_y  , false); // don't make frontmost
 624
 625         if ( doResize )
 626             ::SizeWindow((WindowRef)m_macWindow, m_width, m_height  , true);
 627
 628         // the OS takes care of invalidating and erasing the new area
 629         // we have erased the old one
 630
 631         if ( IsKindOf( CLASSINFO( wxFrame ) ) )
 632         {
 633             wxFrame* frame = (wxFrame*) this ;
 634             frame->PositionStatusBar();
 635             frame->PositionToolBar();
 636         }
 637         if ( doMove )
 638             wxWindowMac::MacTopLevelWindowChangedPosition() ; // like this only children will be notified
 639
 640         MacRepositionScrollBars() ;
 641         if ( doMove )
 642         {
 643             wxPoint point(m_x, m_y);
 644             wxMoveEvent event(point, m_windowId);
 645             event.SetEventObject(this);
 646             GetEventHandler()->ProcessEvent(event) ;
 647         }
 648         if ( doResize )
 649         {
 650              MacRepositionScrollBars() ;
 651              wxSize size(m_width, m_height);
 652              wxSizeEvent event(size, m_windowId);
 653              event.SetEventObject(this);
 654              GetEventHandler()->ProcessEvent(event);
 655         }
 656     }
 657
 658 }
 659
 660 /*
 661  * Invalidation Mechanism
 662  *
 663  * The update mechanism reflects exactely the windows mechanism
 664  * the rect gets added to the window invalidate region, if the eraseBackground flag
 665  * has been true for any part of the update rgn the background is erased in the entire region
 666  * not just in the specified rect.
 667  *
 668  * In order to achive this, we also have an internal m_macNoEraseUpdateRgn, all rects that have
 669  * the eraseBackground flag set to false are also added to this rgn. upon receiving an update event
 670  * the update rgn is compared to the m_macNoEraseUpdateRgn and in case they differ, every window
 671  * will get the eraseBackground event first
 672  */
 673
 674 void wxTopLevelWindowMac::MacInvalidate( const WXRECTPTR rect, bool eraseBackground )
 675 {
 676   GrafPtr formerPort ;
 677   GetPort( &formerPort ) ;
 678   SetPortWindowPort( (WindowRef)m_macWindow ) ;
 679
 680   m_macNeedsErasing |= eraseBackground ;
 681
 682   // if we already know that we will have to erase, there's no need to track the rest
 683   if ( !m_macNeedsErasing)
 684   {
 685     // we end only here if eraseBackground is false
 686     // if we already have a difference between m_macNoEraseUpdateRgn and UpdateRgn
 687     // we will have to erase anyway
 688
 689     RgnHandle       updateRgn = NewRgn();
 690     RgnHandle       diffRgn = NewRgn() ;
 691     if ( updateRgn && diffRgn )
 692     {
 693         GetWindowUpdateRgn( (WindowRef)m_macWindow , updateRgn );
 694         Point pt = {0,0} ;
 695         LocalToGlobal( &pt ) ;
 696         OffsetRgn( updateRgn , -pt.h , -pt.v ) ;
 697         DiffRgn( updateRgn , (RgnHandle) m_macNoEraseUpdateRgn , diffRgn ) ;
 698         if ( !EmptyRgn( diffRgn ) )
 699         {
 700             m_macNeedsErasing = true ;
 701         }
 702     }
 703     if ( updateRgn )
 704         DisposeRgn( updateRgn );
 705     if ( diffRgn )
 706         DisposeRgn( diffRgn );
 707
 708     if ( !m_macNeedsErasing )
 709     {
 710       RgnHandle rectRgn = NewRgn() ;
 711       SetRectRgn( rectRgn , ((Rect*)rect)->left , ((Rect*)rect)->top , ((Rect*)rect)->right , ((Rect*)rect)->bottom ) ;
 712       UnionRgn( (RgnHandle) m_macNoEraseUpdateRgn , rectRgn , (RgnHandle) m_macNoEraseUpdateRgn ) ;
 713       DisposeRgn( rectRgn ) ;
 714     }
 715   }
 716   InvalWindowRect( (WindowRef)m_macWindow , (Rect*)rect ) ;
 717   // turn this on to debug the refreshing cycle
 718 #if wxMAC_DEBUG_REDRAW
 719   PaintRect( rect ) ;
 720 #endif
 721   SetPort( formerPort ) ;
 722 }
 723