[計算機]將玻璃框擴展到WPF應(yīng)用程序

1、.本主題演示如何將 Windows Vista 玻璃框擴展至 Windows Presentation Foundation (WPF) 應(yīng)用程序的工作區(qū)。說明：此示例僅在運行已啟用玻璃效果的桌面窗口管理器 (DWM) 的 Windows Vista 計算機上才會起作用。Windows Vista Home Basic 版本不支持透明玻璃效果。通常利用透明玻璃效果呈現(xiàn)的區(qū)域在其他版本的 Windows Vista 上呈現(xiàn)為不透明。 示例 下面的示例演示一個已擴展到 Internet Explorer 7 地址欄的玻璃框。Internet Explorer，擴展的玻璃框位于地址欄后。若

2、要在 WPF 應(yīng)用程序上擴展玻璃框，需要訪問非托管的 API。下面的代碼示例為擴展玻璃框工作區(qū)所需的兩個 API 執(zhí)行平臺調(diào)用 (pinvoke)。每個 API 都是在名為 NonClientRegionAPI 的類中聲明的。C# 復制代碼 StructLayout(LayoutKind.Sequential)public struct MARGINS public int cxLeftWidth; / width of left border that retains its size public int cxRightWidth; / width of right border that

3、 retains its size public int cyTopHeight; / height of top border that retains its size public int cyBottomHeight; / height of bottom border that retains its size;DllImport("DwmApi.dll")public static extern int DwmExtendFrameIntoClientArea( IntPtr hwnd, ref MARGINS pMarInset);DwmExtendFrame

4、IntoClientArea 是用于將框擴展到工作區(qū)中的 DWM 函數(shù)。它有兩個參數(shù)，一個窗口句柄，一個 MARGINS 結(jié)構(gòu)。MARGINS 用于告知 DWM 框擴展到工作區(qū)中時延伸的程度。若要使用 DwmExtendFrameIntoClientArea 函數(shù)，必須獲取一個窗口句柄。在 WPF 中，可以通過 HwndSource 的 Handle 屬性獲取窗口句柄。在下面的示例中，框擴展至窗口的 Loaded 事件的工作區(qū)。C# 復制代碼 void OnLoaded(object sender, RoutedEventArgs e) try / Obtain the window hand

5、le for WPF application IntPtr mainWindowPtr = new WindowInteropHelper(this).Handle; HwndSource mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr); mainWindowSrc.CompositionTarget.BackgroundColor = Color.FromArgb(0, 0, 0, 0); / Get System Dpi System.Drawing.Graphics desktop = System.Drawing.Graphics.

6、FromHwnd(mainWindowPtr); float DesktopDpiX = desktop.DpiX; float DesktopDpiY = desktop.DpiY; / Set Margins NonClientRegionAPI.MARGINS margins = new NonClientRegionAPI.MARGINS(); / Extend glass frame into client area / Note that the default desktop Dpi is 96dpi. The margins are / adjusted for the sys

7、tem Dpi. margins.cxLeftWidth = Convert.ToInt32(5 * (DesktopDpiX / 96); margins.cxRightWidth = Convert.ToInt32(5 * (DesktopDpiX / 96); margins.cyTopHeight = Convert.ToInt32(int)topBar.ActualHeight + 5) * (DesktopDpiX / 96); margins.cyBottomHeight = Convert.ToInt32(5 * (DesktopDpiX / 96); int hr = Non

8、ClientRegionAPI.DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins); / if (hr < 0) /DwmExtendFrameIntoClientArea Failed / If not Vista, paint background white. catch (DllNotFoundException) Application.Current.MainWindow.Background = Brushes.White; 下面的示例演示一個簡單的窗口，在此窗口中框擴展至工作區(qū)。此框擴展到上邊框的

9、后面，上邊框包含兩個 TextBox 對象。C# 復制代碼 <Window x:Class="SDKSample.Window1" xmlns=" xmlns:x=" Title="Extended Glass in WPF" Height="300" Width="400" Loaded="OnLoaded" Background="Transparent" > <Grid ShowGridLines="True"&

10、gt; <DockPanel Name="mainDock"> <!- The border is used to compute the rendered height with margins. topBar contents will be displayed on the extended glass frame.-> <Border Name="topBar" DockPanel.Dock="Top" > <Grid Name="grid"> <Gri

11、d.ColumnDefinitions> <ColumnDefinition MinWidth="100" Width="*"/> <ColumnDefinition Width="Auto"/> </Grid.ColumnDefinitions> <TextBox Grid.Column="0" MinWidth="100" Margin="0,0,10,5">Path</TextBox> <TextBox Grid.Column="1" MinWidth="75" Margin="0,0,0,5">Search</TextBox> </Grid> </Border> <Grid DockPanel.Dock="Top" > <Grid.ColumnDefinitions> <ColumnDefinition/> </Grid.ColumnDefi