1 files changed, 21 insertions, 0 deletions
diff --git a/src/gui/kernel/qcocoaview_mac.mm b/src/gui/kernel/qcocoaview_mac.mm
index 118d54c..670226b 100644
--- a/src/gui/kernel/qcocoaview_mac.mm
+++ b/src/gui/kernel/qcocoaview_mac.mm
@@ -946,6 +946,27 @@ extern "C" {
     }
 }
 
+- (void)viewWillMoveToWindow:(NSWindow *)window
+{
+    if (qwidget->windowFlags() & Qt::MSWindowsOwnDC
+          && (window != [self window])) { // OpenGL Widget
+        // Create a stupid ClearDrawable Event
+        QEvent event(QEvent::MacGLClearDrawable);
+        qApp->sendEvent(qwidget, &event);
+    }
+}
+
+- (void)viewDidMoveToWindow
+{
+    if (qwidget->windowFlags() & Qt::MSWindowsOwnDC && [self window]) {
+        // call update paint event
+        qwidgetprivate->needWindowChange = true;
+        QEvent event(QEvent::MacGLWindowChange);
+        qApp->sendEvent(qwidget, &event);
+    }
+}
+
+
 // NSTextInput Protocol implementation
 
 - (void) insertText:(id)aString