X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b8702c673a43e398df644670f4f343cb43df50d0..23717034757c259cd578b6f72d74857e61e79817:/src/osx/cocoa/window.mm

diff --git a/src/osx/cocoa/window.mm b/src/osx/cocoa/window.mm
index 26c705fcdd..f19ebfb231 100644
--- a/src/osx/cocoa/window.mm
+++ b/src/osx/cocoa/window.mm
@@ -1201,13 +1201,28 @@ void wxWidgetCocoaImpl::drawRect(void* rect, WXWidget slf, void *WXUNUSED(_cmd))
         updateRgn.Offset( wxpeer->MacGetLeftBorderSize() , wxpeer->MacGetTopBorderSize() );
     }
     
-    if ( wxpeer->MacGetTopLevelWindow()->GetWindowStyle() & wxFRAME_SHAPED )
+    // Restrict the update region to the shape of the window, if any, and also
+    // remember the region that we need to clear later.
+    wxNonOwnedWindow* const tlwParent = wxpeer->MacGetTopLevelWindow();
+    const bool isTopLevel = tlwParent == wxpeer;
+    wxRegion clearRgn;
+    if ( tlwParent->GetWindowStyle() & wxFRAME_SHAPED )
     {
+        if ( isTopLevel )
+            clearRgn = updateRgn;
+
         int xoffset = 0, yoffset = 0;
-        wxRegion rgn = wxpeer->MacGetTopLevelWindow()->GetShape();
+        wxRegion rgn = tlwParent->GetShape();
         wxpeer->MacRootWindowToWindow( &xoffset, &yoffset );
         rgn.Offset( xoffset, yoffset );
         updateRgn.Intersect(rgn);
+
+        if ( isTopLevel )
+        {
+            // Exclude the window shape from the region to be cleared below.
+            rgn.Xor(wxpeer->GetSize());
+            clearRgn.Intersect(rgn);
+        }
     }
     
     wxpeer->GetUpdateRegion() = updateRgn;
@@ -1259,6 +1274,35 @@ void wxWidgetCocoaImpl::drawRect(void* rect, WXWidget slf, void *WXUNUSED(_cmd))
         CGContextTranslateCTM( context, 0,  [m_osxView bounds].size.height );
         CGContextScaleCTM( context, 1, -1 );
     }
+
+    if ( isTopLevel )
+    {
+        // We also need to explicitly draw the part of the top level window
+        // outside of its region with transparent colour to ensure that it is
+        // really transparent.
+        if ( clearRgn.IsOk() )
+        {
+            wxMacCGContextStateSaver saveState(context);
+            wxWindowDC dc(wxpeer);
+            dc.SetBackground(wxBrush(wxTransparentColour));
+            dc.SetDeviceClippingRegion(clearRgn);
+            dc.Clear();
+        }
+
+#if wxUSE_GRAPHICS_CONTEXT
+        // If the window shape is defined by a path, stroke the path to show
+        // the window border.
+        const wxGraphicsPath& path = tlwParent->GetShapePath();
+        if ( !path.IsNull() )
+        {
+            CGContextSetLineWidth(context, 1);
+            CGContextSetStrokeColorWithColor(context, wxLIGHT_GREY->GetCGColor());
+            CGContextAddPath(context, (CGPathRef) path.GetNativePath());
+            CGContextStrokePath(context);
+        }
+#endif // wxUSE_GRAPHICS_CONTEXT
+    }
+
     wxpeer->MacPaintChildrenBorders();
     wxpeer->MacSetCGContextRef( NULL );
     CGContextRestoreGState( context );