-/*
- * Invalidation Mechanism
- *
- * The update mechanism reflects exactely the windows mechanism
- * the rect gets added to the window invalidate region, if the eraseBackground flag
- * has been true for any part of the update rgn the background is erased in the entire region
- * not just in the specified rect.
- *
- * In order to achive this, we also have an internal m_macNoEraseUpdateRgn, all rects that have
- * the eraseBackground flag set to false are also added to this rgn. upon receiving an update event
- * the update rgn is compared to the m_macNoEraseUpdateRgn and in case they differ, every window
- * will get the eraseBackground event first
- */
-
-void wxTopLevelWindowMac::MacInvalidate( const WXRECTPTR rect, bool eraseBackground )
-{
- GrafPtr formerPort ;
- GetPort( &formerPort ) ;
- SetPortWindowPort( (WindowRef)m_macWindow ) ;
-
- m_macNeedsErasing |= eraseBackground ;
-
- // if we already know that we will have to erase, there's no need to track the rest
- if ( !m_macNeedsErasing)
- {
- // we end only here if eraseBackground is false
- // if we already have a difference between m_macNoEraseUpdateRgn and UpdateRgn
- // we will have to erase anyway
-
- RgnHandle updateRgn = NewRgn();
- RgnHandle diffRgn = NewRgn() ;
- if ( updateRgn && diffRgn )
- {
- GetWindowUpdateRgn( (WindowRef)m_macWindow , updateRgn );
- Point pt = {0,0} ;
- LocalToGlobal( &pt ) ;
- OffsetRgn( updateRgn , -pt.h , -pt.v ) ;
- DiffRgn( updateRgn , (RgnHandle) m_macNoEraseUpdateRgn , diffRgn ) ;
- if ( !EmptyRgn( diffRgn ) )
- {
- m_macNeedsErasing = true ;
- }
- }
- if ( updateRgn )
- DisposeRgn( updateRgn );
- if ( diffRgn )
- DisposeRgn( diffRgn );
-
- if ( !m_macNeedsErasing )
- {
- RgnHandle rectRgn = NewRgn() ;
- SetRectRgn( rectRgn , ((Rect*)rect)->left , ((Rect*)rect)->top , ((Rect*)rect)->right , ((Rect*)rect)->bottom ) ;
- UnionRgn( (RgnHandle) m_macNoEraseUpdateRgn , rectRgn , (RgnHandle) m_macNoEraseUpdateRgn ) ;
- DisposeRgn( rectRgn ) ;
- }
- }
- InvalWindowRect( (WindowRef)m_macWindow , (Rect*)rect ) ;
- // turn this on to debug the refreshing cycle
-#if wxMAC_DEBUG_REDRAW
- PaintRect( rect ) ;
-#endif
- SetPort( formerPort ) ;
-}