private void _RestoreGlassFrame()
{
Assert.IsNull(_chromeInfo);
Assert.IsNotNull(_window);
// Expect that this might be called on OSes other than Vista
// and if the window hasn't yet been shown, then we don't need to undo anything.
if (!Utility.IsOSVistaOrNewer || _hwnd == IntPtr.Zero)
{
return;
}
_hwndSource.CompositionTarget.BackgroundColor = SystemColors.WindowColor;
if (NativeMethods.DwmIsCompositionEnabled())
{
// If glass is enabled, push it back to the normal bounds.
var dwmMargin = new MARGINS();
NativeMethods.DwmExtendFrameIntoClientArea(_hwnd, ref dwmMargin);
}
}
public static extern void DwmExtendFrameIntoClientArea(IntPtr hwnd, ref MARGINS pMarInset);
private void _ExtendGlassFrame()
{
Assert.IsNotNull(_window);
// Expect that this might be called on OSes other than Vista.
if (!Utility.IsOSVistaOrNewer)
{
// Not an error. Just not on Vista so we're not going to get glass.
return;
}
if (IntPtr.Zero == _hwnd)
{
// Can't do anything with this call until the Window has been shown.
return;
}
// Ensure standard HWND background painting when DWM isn't enabled.
if (!NativeMethods.DwmIsCompositionEnabled())
{
_hwndSource.CompositionTarget.BackgroundColor = SystemColors.WindowColor;
}
else
{
// This makes the glass visible at a Win32 level so long as nothing else is covering it.
// The Window's Background needs to be changed independent of this.
// Apply the transparent background to the HWND
_hwndSource.CompositionTarget.BackgroundColor = Colors.Transparent;
// Thickness is going to be DIPs, need to convert to system coordinates.
Thickness deviceGlassThickness = DpiHelper.LogicalThicknessToDevice(_chromeInfo.GlassFrameThickness);
if (_chromeInfo.SacrificialEdge != SacrificialEdge.None)
{
Thickness windowResizeBorderThicknessDevice = DpiHelper.LogicalThicknessToDevice(SystemParameters2.Current.WindowResizeBorderThickness);
if (Utility.IsFlagSet((int)_chromeInfo.SacrificialEdge, (int)SacrificialEdge.Top))
{
deviceGlassThickness.Top -= windowResizeBorderThicknessDevice.Top;
deviceGlassThickness.Top = Math.Max(0, deviceGlassThickness.Top);
}
if (Utility.IsFlagSet((int)_chromeInfo.SacrificialEdge, (int)SacrificialEdge.Left))
{
deviceGlassThickness.Left -= windowResizeBorderThicknessDevice.Left;
deviceGlassThickness.Left = Math.Max(0, deviceGlassThickness.Left);
}
if (Utility.IsFlagSet((int)_chromeInfo.SacrificialEdge, (int)SacrificialEdge.Bottom))
{
deviceGlassThickness.Bottom -= windowResizeBorderThicknessDevice.Bottom;
deviceGlassThickness.Bottom = Math.Max(0, deviceGlassThickness.Bottom);
}
if (Utility.IsFlagSet((int)_chromeInfo.SacrificialEdge, (int)SacrificialEdge.Right))
{
deviceGlassThickness.Right -= windowResizeBorderThicknessDevice.Right;
deviceGlassThickness.Right = Math.Max(0, deviceGlassThickness.Right);
}
}
var dwmMargin = new MARGINS
{
// err on the side of pushing in glass an extra pixel.
cxLeftWidth = (int)Math.Ceiling(deviceGlassThickness.Left),
cxRightWidth = (int)Math.Ceiling(deviceGlassThickness.Right),
cyTopHeight = (int)Math.Ceiling(deviceGlassThickness.Top),
cyBottomHeight = (int)Math.Ceiling(deviceGlassThickness.Bottom),
};
NativeMethods.DwmExtendFrameIntoClientArea(_hwnd, ref dwmMargin);
}
}
private static bool _ExtendGlassFrameInternal(Window window, Thickness margin)
{
Assert.IsNotNull(window);
Assert.IsTrue(window.CheckAccess());
// Expect that this might be called on OSes other than Vista.
if (!Utility.IsOSVistaOrNewer)
{
// Not an error. Just not on Vista so we're not going to get glass.
return false;
}
IntPtr hwnd = new WindowInteropHelper(window).Handle;
if (IntPtr.Zero == hwnd)
{
throw new InvalidOperationException("Window must be shown before extending glass.");
}
HwndSource hwndSource = HwndSource.FromHwnd(hwnd);
bool isGlassEnabled = NativeMethods.DwmIsCompositionEnabled();
if (!isGlassEnabled)
{
window.Background = SystemColors.WindowBrush;
hwndSource.CompositionTarget.BackgroundColor = SystemColors.WindowColor;
}
else
{
// Apply the transparent background to both the Window and the HWND
window.Background = Brushes.Transparent;
hwndSource.CompositionTarget.BackgroundColor = Colors.Transparent;
// Thickness is going to be DIPs, need to convert to system coordinates.
Point deviceTopLeft = DpiHelper.LogicalPixelsToDevice(new Point(margin.Left, margin.Top));
Point deviceBottomRight = DpiHelper.LogicalPixelsToDevice(new Point(margin.Right, margin.Bottom));
var dwmMargin = new MARGINS
{
// err on the side of pushing in glass an extra pixel.
cxLeftWidth = (int)Math.Ceiling(deviceTopLeft.X),
cxRightWidth = (int)Math.Ceiling(deviceBottomRight.X),
cyTopHeight = (int)Math.Ceiling(deviceTopLeft.Y),
cyBottomHeight = (int)Math.Ceiling(deviceBottomRight.Y),
};
NativeMethods.DwmExtendFrameIntoClientArea(hwnd, ref dwmMargin);
}
// Even if glass isn't currently enabled, add the hook so we can appropriately respond
// if that changes.
bool addHook = !_extendedWindows.ContainsKey(hwnd);
if (addHook)
{
HwndSourceHook hook = delegate(IntPtr innerHwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (WM.DWMCOMPOSITIONCHANGED == (WM)msg)
{
_ExtendGlassFrameInternal(window, margin);
handled = false;
}
return IntPtr.Zero;
};
_extendedWindows.Add(hwnd, hook);
hwndSource.AddHook(hook);
window.Closing += _OnExtendedWindowClosing;
}
return isGlassEnabled;
}