我有一个WPF窗口,将WindowStyle设置为none。有没有办法强制该窗口产生一个阴影(就像WindowStyle不为none时获得的那个)?我不想将AllowTransparency设置为true,因为它会影响性能。我也不想禁用硬件渲染(我在某个地方读到透明度使用禁用硬件渲染可以更好地执行)。
我有一个WPF窗口,将WindowStyle设置为none。有没有办法强制该窗口产生一个阴影(就像WindowStyle不为none时获得的那个)?我不想将AllowTransparency设置为true,因为它会影响性能。我也不想禁用硬件渲染(我在某个地方读到透明度使用禁用硬件渲染可以更好地执行)。
Window
上投射标准阴影,但使 AllowsTransparency
属性设置为 false
。DropShadowToWindow(Window window)
方法。最好是在窗口的构造函数中的 InitializeComponent()
方法后立即调用此方法,但即使在窗口显示后调用它也可以正常工作。using System;
using System.Drawing.Printing;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
public static class DwmDropShadow
{
[DllImport("dwmapi.dll", PreserveSig = true)]
private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref int attrValue, int attrSize);
[DllImport("dwmapi.dll")]
private static extern int DwmExtendFrameIntoClientArea(IntPtr hWnd, ref Margins pMarInset);
/// <summary>
/// Drops a standard shadow to a WPF Window, even if the window is borderless. Only works with DWM (Windows Vista or newer).
/// This method is much more efficient than setting AllowsTransparency to true and using the DropShadow effect,
/// as AllowsTransparency involves a huge performance issue (hardware acceleration is turned off for all the window).
/// </summary>
/// <param name="window">Window to which the shadow will be applied</param>
public static void DropShadowToWindow(Window window)
{
if (!DropShadow(window))
{
window.SourceInitialized += new EventHandler(window_SourceInitialized);
}
}
private static void window_SourceInitialized(object sender, EventArgs e)
{
Window window = (Window)sender;
DropShadow(window);
window.SourceInitialized -= new EventHandler(window_SourceInitialized);
}
/// <summary>
/// The actual method that makes API calls to drop the shadow to the window
/// </summary>
/// <param name="window">Window to which the shadow will be applied</param>
/// <returns>True if the method succeeded, false if not</returns>
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;
}
}
}
Patrick的答案很好,但当一个win32窗口被托管时会出现问题。 当发生这种情况时,你会注意到托管的窗口被“洗脸”了(看起来像Windows将“玻璃板”效果应用于整个托管窗口)。 当在本地定义结构时,可以解决这种奇怪的行为,例如:
[StructLayout(LayoutKind.Sequential)]
public struct Margins
{
public int Left;
public int Right;
public int Top;
public int Bottom;
}
ResizeMode
设置为CanResize
来实现,那么您将获得操作系统的阴影效果。然后,您可以将MaxWidth
、MinWidth
、MaxHeight
和MinHeight
设置为防止调整大小的值。<Canvas/>
内容中的第一个元素,就像这样:<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" AllowsTransparency="True" Background="Transparent" WindowStyle="None">
<Canvas>
<Rectangle Fill="#33000000" Width="100" Height="100"/>
<Rectangle Fill="#FFFF0000" Width="95" Height="95" />
</Canvas>
</Window>
Rectangle
的Fill
属性是部分透明的,您也可以使用Rectangle
的Opacity
属性来实现。您可以使用自己的图形或不同的形状来自定义投影的外观。AllowsTransparency
设置为False
的要求,但您别无选择:如果您想要透明度,您必须允许它。<Window x:Class="WPF_Custom_Look.ShadowWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="ShadowWindow" Height="400" Width="450" ResizeMode="NoResize" Background="Transparent" AllowsTransparency="True" WindowStyle="None">
<Grid>
<Rectangle Fill="Black" Width="330" Opacity="0.5" Height="279">
<Rectangle.Effect>
<BlurEffect Radius="30"/>
</Rectangle.Effect>
</Rectangle>
<Rectangle Fill="#FFFDFDFD" Width="312" Height="260"/>
</Grid>
如果您需要一个透明的标题栏,可以用<Border>
替换它
<Canvas>
<Border BorderBrush="Black" BorderThickness="7" Height="195" Width="304" Canvas.Left="53" Canvas.Top="25">
<Border.Effect>
<BlurEffect Radius="20"/>
</Border.Effect>
</Border>
<Rectangle Fill="#FF86B0F9" Width="285" Height="177" Opacity="0.7" Canvas.Left="62" Canvas.Top="34" MouseDown="Border_MouseDown"/>
<Rectangle Fill="#FFFDFDFD" Width="285" Height="143" Canvas.Left="62" Canvas.Top="68"/>
</Canvas>
编辑:我刚注意到OP想要AllowsTransparency设置为False。 我看不到一个阴影可以在没有它被设置为“True”的情况下工作。
System.Drawing.Printing.Margins
,它会在某些机器上导致奇怪的图形故障。相反,像@Omer Ran建议的那样,在本地定义结构体。 - Kelly Elton