public static bool ExtendGlassFrame(Window window, Thickness margin)
{
if (!DwmIsCompositionEnabled())
{
return false;
}
IntPtr hwnd = new WindowInteropHelper(window).Handle;
if (hwnd == IntPtr.Zero)
{
throw new InvalidOperationException("The Window must be shown before extending glass.");
}
// Set the background to transparent from both the WPF and Win32 perspectives.
window.Background = Brushes.Transparent;
HwndSource.FromHwnd(hwnd).CompositionTarget.BackgroundColor = Colors.Transparent;
MARGINS margins = new MARGINS(margin);
DwmExtendFrameIntoClientArea(hwnd, ref margins);
return true;
}
private static extern void DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS pMarInsert);
