效果圖:
有不少示例介紹了如何將Vista Aero效果擴展到整個窗口,但大都是針對Windows Form應用程序,而不是WPF(即前者針對的是Form類,後者是針對的Window類),比如http://www.cnblogs.com/zhouyinhui/archive/2007/05/30/765416.html
其實與其類似,都是調用dwmapi,只不過Window類沒有直接給我們提供句柄,我們需要這樣的代碼來找到其句柄:
IntPtr hwnd = new System.Windows.Interop.WindowInteropHelper(window).Handle;
然後將窗口的背景設置為透明:
window.Background = Brushes.Transparent;
HwndSource.FromHwnd(hwnd).CompositionTarget.BackgroundColor = Colors.Transparent;最後調用
DwmApi.DwmExtendFrameIntoClientArea(hwnd, margins);
注意,我們應該在窗口被顯示之後(SourceInitialized之後)再調用我們的函數否則會引發異常。
參考代碼:
public partial class Window1 : System.Windows.Window
{
public Window1()
{
InitializeComponent();
}
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
DWMLib.AeroHelper.ExtendGlassFrame(this, new Thickness(-1));
}
}
public class AeroHelper
{
public static bool ExtendGlassFrame(Window window, Thickness margin)
{
if (!DwmApi.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;
DWMLib.DwmApi.MARGINS margins = new DWMLib.DwmApi.MARGINS((int)margin.Left, (int)margin.Top, (int)margin.Right, (int)margin.Bottom);
DwmApi.DwmExtendFrameIntoClientArea(hwnd, margins);
return true;
}
public class DwmApi
{
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmEnableBlurBehindWindow(IntPtr hWnd, DWM_BLURBEHIND pBlurBehind);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmExtendFrameIntoClientArea(IntPtr hWnd, MARGINS pMargins);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern bool DwmIsCompositionEnabled();
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmGetColorizationColor(
out int pcrColorization,
[MarshalAs(UnmanagedType.Bool)]out bool pfOpaqueBlend);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmEnableComposition(bool bEnable);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern IntPtr DwmRegisterThumbnail(IntPtr dest, IntPtr source);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmUnregisterThumbnail(IntPtr hThumbnail);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmUpdateThumbnailProperties(IntPtr hThumbnail, DWM_THUMBNAIL_PROPERTIES props);
[DllImport("dwmapi.dll", PreserveSig = false)]
public static extern void DwmQueryThumbnailSourceSize(IntPtr hThumbnail, out Size size);
[StructLayout(LayoutKind.Sequential)]
public class DWM_THUMBNAIL_PROPERTIES
{
public uint dwFlags;
public RECT rcDestination;
public RECT rcSource;
public byte opacity;
[MarshalAs(UnmanagedType.Bool)]
public bool fVisible;
[MarshalAs(UnmanagedType.Bool)]
public bool fSourceClientAreaOnly;
public const uint DWM_TNP_RECTDESTINATION = 0x00000001;
public const uint DWM_TNP_RECTSOURCE = 0x00000002;
public const uint DWM_TNP_OPACITY = 0x00000004;
public const uint DWM_TNP_VISIBLE = 0x00000008;
public const uint DWM_TNP_SOURCECLIENTAREAONLY = 0x00000010;
}
[StructLayout(LayoutKind.Sequential)]
public class MARGINS
{
public int cxLeftWidth, cxRightWidth, cyTopHeight, cyBottomHeight;
public MARGINS(int left, int top, int right, int bottom)
{
cxLeftWidth = left;
cyTopHeight = top;
cxRightWidth = right;
cyBottomHeight = bottom;
}
}
[StructLayout(LayoutKind.Sequential)]
public class DWM_BLURBEHIND
{
public uint dwFlags;
[MarshalAs(UnmanagedType.Bool)]
public bool fEnable;
public IntPtr hRegionBlur;
[MarshalAs(UnmanagedType.Bool)]
public bool fTransitionOnMaximized;
public const uint DWM_BB_ENABLE = 0x00000001;
public const uint DWM_BB_BLURREGION = 0x00000002;
public const uint DWM_BB_TRANSITIONONMAXIMIZED = 0x00000004;
}
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int left, top, right, bottom;
public RECT(int left, int top, int right, int bottom)
{
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
}
}