我有一个带有自定义窗口边框的
WPF应用程序(.NET Framework 4).我使用
WPF Shell Integration Library禁用了玻璃边框,并绘制了自己的边框.但是我想在未最大化时在窗口边框周围添加一个DropShadow.我添加了这样的阴影:
private static bool DropShadow(Window window)
{
try
{
WindowInteropHelper helper = new WindowInteropHelper(window);
int val = 2;
int ret1 = DwmSetWindowAttribute(helper.Handle, 2, ref val, 4);
if (ret1 == 0)
{
Margins m = new Margins { Bottom = 0, Left = 0, Right = 0, Top = 0 };
int ret2 = DwmExtendFrameIntoClientArea(helper.Handle, ref m);
return ret2 == 0;
}
else
{
return false;
}
}
catch (Exception ex)
{
// Probably dwmapi.dll not found (incompatible OS)
return false;
}
}
有关详细信息,请参阅:DropShadow for WPF Borderless Window
使用WindowState.Normal时,此解决方案正常工作!但是,当我最大化应用程序并禁用DWMWA_NCRENDERING_POLICY时,窗口的背景变得稍微透明,并且我的大多数控件渲染完全不同于我以前的.
在下图中,您可以看到最初的最大化状态,以及阴影代码.正如您所看到的,它完全改变了窗口的透明度和阴影代码:o
有什么我想念的吗?我一直在阅读DWM Function library,但找不到答案……
最佳答案 过了一会儿,我从另一个角度重新审视了这个问题并找到了一个更好的解决方案:
public class GlassWindow : Window
{
[SuppressUnmanagedCodeSecurity]
internal static class DwmNativeMethods
{
[StructLayout(LayoutKind.Sequential)]
internal struct DwmMargins
{
public int cxLeftWidth;
public int cxRightWidth;
public int cyTopHeight;
public int cyBottomHeight;
public DwmMargins(bool fullWindow)
{
this.cxLeftWidth = this.cxRightWidth = this.cyTopHeight = this.cyBottomHeight = fullWindow ? -1 : 0;
}
}
[DllImport("DwmApi.dll")]
internal static extern int DwmExtendFrameIntoClientArea(IntPtr hwnd, ref DwmMargins m);
[DllImport("DwmApi.dll")]
internal static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
}
private IntPtr windowHandle;
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
WindowInteropHelper interopHelper = new WindowInteropHelper(this);
this.windowHandle = interopHelper.Handle;
this.ToggleAreoGlass(this.WindowState != WindowState.Maximized);
this.StateChanged += this.GlassWindowStateChanged;
}
private void ToggleAreoGlass(bool value)
{
// Enable NcRenderingPolicy
int attrValue = 2;
int result = DwmNativeMethods.DwmSetWindowAttribute(this.windowHandle, 2, ref attrValue, 4);
if (result == 0)
{
// Extend DwmFrame
DwmNativeMethods.DwmMargins margins = new DwmNativeMethods.DwmMargins(value);
DwmNativeMethods.DwmExtendFrameIntoClientArea(this.windowHandle, ref margins);
}
}
private void GlassWindowStateChanged(object sender, EventArgs e)
{
this.ToggleAreoGlass(this.WindowState != WindowState.Maximized);
}
}