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The final step is to apply the margins to the window using the DwmExtendFrameIntoClientArea() function. The following code shows an all-in-one helper method that takes the WPF margin measurements and a reference to a WPF window. It then gets the Win32 handle for the window, adjusts the margins, and attempts to extend the glass frame. public static void ExtendGlass(Window win, int left, int right, int top, int bottom) { // Obtain the Win32 window handle for the WPF window. WindowInteropHelper windowInterop = new WindowInteropHelper(win); IntPtr windowHandle = windowInterop.Handle; // Adjust the margins to take the system DPI into account. Margins margins = GetDpiAdjustedMargins( windowHandle, left, right, top, bottom); // Extend the int returnVal if (returnVal { throw new } } The sample code for this chapter wraps all these ingredients into a single class, called VistaGlassHelper, which you can call from any window. For the code to work, you must call it before the window is shown. The Window.Loaded event provides the perfect opportunity. Additionally, you must remember to set the Background of your window to Transparent so the glass frame shows through the WPF drawing surface. Figure 23-9 shows an example that thickens the top edge of the glass frame. glass frame. = DwmExtendFrameIntoClientArea(windowHandle, ref margins); < 0) NotSupportedException("Operation failed.");

Summary

MyViewModel viewModel = DataContext as MyViewModel; if (viewModel) { viewModel.ProcessMouseEnter(e.LeftButton); e.Handled = true; } } This event handler does not do any processing of its own it acquires the ViewModel from the DataContext of the Window and forwards the message on to it, marking the event as handled to prevent further bubbling. The ViewModel is then free to process this just as it would any other message or command.

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When creating this window, the content at the top is grouped into a single Border element. That way, you can measure the height of the border and use that measurement to extend the glass frame. (Of course, the glass frame is set only once, when the window is first created. If you change content or resize the window and the Border grows or shrinks, it won t line up with the glass frame any longer.) Here s the complete markup for the window: <Window x:Class="Windows.VistaGlassWindow2" ... Loaded="window_Loaded" Background="Transparent" > <Grid > <DockPanel Name="mainDock" LastChildFill="True"> <!-- 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"> <StackPanel> <TextBlock Padding="5">Some content that's docked to the top.</TextBlock> <Button Margin="5" Padding="5">A Button</Button> </StackPanel> </Border> <Border Background="White"> <StackPanel Margin="5"> <TextBlock Margin="5" >Some text.</TextBlock> <Button Margin="5" Padding="5">A Button</Button> </StackPanel> </Border> </DockPanel> </Grid> </Window> Notice that the second Border in this window, which contains the rest of the content, must explicitly set its background to white. Otherwise, this part of the window will be completely transparent. For the same reason, the second Border shouldn t have any margin space, or you ll see a transparent edge around it. When the window is loaded, it calls the ExtendGlass() method and passes in the new coordinates. Ordinarily, the glass frame is 5 units thick, but this code adds to the top edge. private void window_Loaded(object sender, RoutedEventArgs e) { try { VistaGlassHelper.ExtendGlass(this, 5, 5, (int)topBar.ActualHeight + 5, 5); } catch { // A DllNotFoundException occurs if you run this on Windows XP. // A NotSupportedException is thrown if the // DwmExtendFrameIntoClientArea() call fails. this.Background = Brushes.White; } }

If you want to extend the glass edge so that it covers the entire window, simply pass in margin settings of 1 for each side. Figure 23-10 shows the result.

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