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); }
private static bool _SetWindowThemeAttribute(Window window, bool showCaption, bool showIcon) { bool isGlassEnabled; Assert.IsNotNull(window); Assert.IsTrue(window.CheckAccess()); // This only is expected to work if Aero glass is enabled. try { isGlassEnabled = NativeMethods.DwmIsCompositionEnabled(); } catch (DllNotFoundException) { // 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 we can modify attributes."); } var options = new WTA_OPTIONS { dwMask = (WTNCA.NODRAWCAPTION | WTNCA.NODRAWICON) }; if (isGlassEnabled) { if (!showCaption) { options.dwFlags |= WTNCA.NODRAWCAPTION; } if (!showIcon) { options.dwFlags |= WTNCA.NODRAWICON; } } NativeMethods.SetWindowThemeAttribute(hwnd, WINDOWTHEMEATTRIBUTETYPE.WTA_NONCLIENT, ref options, WTA_OPTIONS.Size); bool addHook = !_attributedWindows.ContainsKey(hwnd); if (addHook) { HwndSourceHook hook = delegate(IntPtr unusedHwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { if (WM.DWMCOMPOSITIONCHANGED == (WM)msg) { _SetWindowThemeAttribute(window, showCaption, showIcon); handled = false; } return(IntPtr.Zero); }; _attributedWindows.Add(hwnd, hook); HwndSource.FromHwnd(hwnd).AddHook(hook); window.Closing += _OnAttributedWindowClosing; } return(isGlassEnabled); }