+ bool partialRepaint = false ;
+
+ if ( !HasFlag(wxFULL_REPAINT_ON_RESIZE) )
+ {
+ wxPoint oldPos( m_x , m_y ) ;
+ wxPoint newPos( actualX , actualY ) ;
+ MacWindowToRootWindow( &oldPos.x , &oldPos.y ) ;
+ MacWindowToRootWindow( &newPos.x , &newPos.y ) ;
+ if ( oldPos == newPos )
+ {
+ partialRepaint = true ;
+ RgnHandle oldRgn,newRgn,diffRgn ;
+ oldRgn = NewRgn() ;
+ newRgn = NewRgn() ;
+ diffRgn = NewRgn() ;
+
+ // invalidate the differences between the old and the new area
+
+ SetRectRgn(oldRgn , oldPos.x , oldPos.y , oldPos.x + m_width , oldPos.y + m_height ) ;
+ SetRectRgn(newRgn , newPos.x , newPos.y , newPos.x + actualWidth , newPos.y + actualHeight ) ;
+ DiffRgn( newRgn , oldRgn , diffRgn ) ;
+ InvalWindowRgn( (WindowRef) MacGetRootWindow() , diffRgn ) ;
+ DiffRgn( oldRgn , newRgn , diffRgn ) ;
+ InvalWindowRgn( (WindowRef) MacGetRootWindow() , diffRgn ) ;
+
+ // we also must invalidate the border areas, someone might optimize this one day to invalidate only the really
+ // changing pixels...
+
+ if ( MacGetLeftBorderSize() != 0 || MacGetRightBorderSize() != 0 ||
+ MacGetTopBorderSize() != 0 || MacGetBottomBorderSize() != 0 )
+ {
+ RgnHandle innerOldRgn, innerNewRgn ;
+ innerOldRgn = NewRgn() ;
+ innerNewRgn = NewRgn() ;
+
+ SetRectRgn(innerOldRgn , oldPos.x + MacGetLeftBorderSize() , oldPos.y + MacGetTopBorderSize() ,
+ oldPos.x + m_width - MacGetRightBorderSize() , oldPos.y + m_height - MacGetBottomBorderSize() ) ;
+ DiffRgn( oldRgn , innerOldRgn , diffRgn ) ;
+ InvalWindowRgn( (WindowRef) MacGetRootWindow() , diffRgn ) ;
+
+ SetRectRgn(innerNewRgn , newPos.x + MacGetLeftBorderSize() , newPos.y + MacGetTopBorderSize() ,
+ newPos.x + actualWidth - MacGetRightBorderSize() , newPos.y + actualHeight - MacGetBottomBorderSize() ) ;
+ DiffRgn( newRgn , innerNewRgn , diffRgn ) ;
+ InvalWindowRgn( (WindowRef) MacGetRootWindow() , diffRgn ) ;
+
+ DisposeRgn( innerOldRgn ) ;
+ DisposeRgn( innerNewRgn ) ;
+ }
+
+ DisposeRgn(oldRgn) ;
+ DisposeRgn(newRgn) ;
+ DisposeRgn(diffRgn) ;
+ }
+ }
+
+ if ( !partialRepaint )
+ Refresh() ;