XP Tabfolder theme code flashes too much when resized

1 files changed, 27 insertions, 0 deletions

diff --git a/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Group.java b/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Group.java
index aa6aa182e4..00a5969570 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Group.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Group.java
@@ -370,4 +370,31 @@ LRESULT WM_SIZE (int wParam, int lParam) {
 	return result;
 }
 
+LRESULT WM_UPDATEUISTATE (int wParam, int lParam) {
+	LRESULT result = super.WM_UPDATEUISTATE (wParam, lParam);
+	if (result != null) return result;
+	/*
+	* Feature in Windows.  When WM_UPDATEUISTATE is sent to
+	* a group, it sends WM_CTLCOLORBTNto get the foreground
+	* and background.  If drawing happens in WM_CTLCOLORBTN,
+	* it will overwrite the contents of the control.  The
+	* fix is draw the group without drawing the background
+	* and avoid the group window proc.
+	* 
+	* NOTE:  The DefWindowProc() must be called in order to
+	* broadcast WM_UPDATEUISTATE message to the children.
+	* 
+	*/
+	if ((state & TRANSPARENT) != 0) {
+		if (OS.COMCTL32_MAJOR >= 6 && OS.IsAppThemed ()) {
+			Control control = findThemeControl ();
+			if (control != null) {
+				OS.InvalidateRect (handle, null, false);
+				int code = OS.DefWindowProc (handle, OS.WM_UPDATEUISTATE, wParam, lParam);
+				return new LRESULT (code);
+			}
+		}
+	}
+	return result;
+}
 }