【IT168 技术文档】Windows 7 操作系统默认具有一款玻璃效果主题(Aero Glass)。如果选择了该款主题，所有的应用程序标题栏都会处于玻璃透明效果(如下图)。这个功能是由Desktop Window Manager(DWM)服务支持的。
默认情况下，我们编写的应用程序在Windows 7 中也只有标题栏和窗口框架会具备玻璃效果，其他区域仍是不透明状态(如下图)。如果想将程序整体都改为上图IE 窗口的效果，可以使用DWM API 将玻璃区域进行扩展。
首先，从dwmapi.dll 中调取DwmExtendFrameIntoClientArea 方法。
[StructLayout(LayoutKind.Sequential)]
public struct MARGINS
{
public int cxLeftWidth;
public int cxRightWidth;
public int cyTopHeight;
public int cyBottomHeight;
};
[DllImport("DwmApi.dll")]
public static extern int DwmExtendFrameIntoClientArea(
IntPtr hwnd,
ref MARGINS pMarInset);
public struct MARGINS
{
public int cxLeftWidth;
public int cxRightWidth;
public int cyTopHeight;
public int cyBottomHeight;
};
[DllImport("DwmApi.dll")]
public static extern int DwmExtendFrameIntoClientArea(
IntPtr hwnd,
ref MARGINS pMarInset);
创建方法ExtendAeroGlass 方法，可将WPF Window窗口的Aero Glass 区域扩展。
private void ExtendAeroGlass(Window window)
{
try
{
// 为WPF程序获取窗口句柄
IntPtr mainWindowPtr = new WindowInteropHelper(window).Handle;
HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
mainWindowSrc.CompositionTarget.BackgroundColor = Colors.Transparent;
// 设置Margins
MARGINS margins = new MARGINS();
// 扩展Aero Glass
margins.cxLeftWidth = -1;
margins.cxRightWidth = -1;
margins.cyTopHeight = -1;
margins.cyBottomHeight = -1;
int hr = DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins);
if (hr < 0)
{
MessageBox.Show("DwmExtendFrameIntoClientArea Failed");
}
}
catch (DllNotFoundException)
{
Application.Current.MainWindow.Background = Brushes.White;
}
}
{
try
{
// 为WPF程序获取窗口句柄
IntPtr mainWindowPtr = new WindowInteropHelper(window).Handle;
HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
mainWindowSrc.CompositionTarget.BackgroundColor = Colors.Transparent;
// 设置Margins
MARGINS margins = new MARGINS();
// 扩展Aero Glass
margins.cxLeftWidth = -1;
margins.cxRightWidth = -1;
margins.cyTopHeight = -1;
margins.cyBottomHeight = -1;
int hr = DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins);
if (hr < 0)
{
MessageBox.Show("DwmExtendFrameIntoClientArea Failed");
}
}
catch (DllNotFoundException)
{
Application.Current.MainWindow.Background = Brushes.White;
}
}
简单制作一个WPF 界面。
<Window x:Class="WpfAeroGlass.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid x:Name="layout">
<Button x:Name="btn" Content="Button" Margin="191,66,202,211" />
<CheckBox x:Name="checkBox" Content="Extend AeroGlass"
Click="CheckBox_Checked" Height="24" Width="121" />
</Grid>
</Window>
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid x:Name="layout">
<Button x:Name="btn" Content="Button" Margin="191,66,202,211" />
<CheckBox x:Name="checkBox" Content="Extend AeroGlass"
Click="CheckBox_Checked" Height="24" Width="121" />
</Grid>
</Window>
补充CheckBox 点击事件，在其中启用ExtendAeroGlass 方法。
private void CheckBox_Checked(object sender, RoutedEventArgs e)
{
if (checkBox.IsChecked.Value)
{
this.Background = Brushes.Transparent;
ExtendAeroGlass(this);
}
else
{
this.Background = Brushes.White;
}
}
{
if (checkBox.IsChecked.Value)
{
this.Background = Brushes.Transparent;
ExtendAeroGlass(this);
}
else
{
this.Background = Brushes.White;
}
}
演示效果
运行程序后，默认界面状态。
点击"Extend AeroGlass" 选框，界面中
Windows API
通过Windows API Code Pack 可以对Aero Glass 效果进行开启或关闭。在程序中加入Microsoft.WindowsAPICodePack.Shell 命名空间，调整AeroGlassCompositioinEnabled 完成开/关Aero Glass的效果。
源代码
