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take advantage of other WPF features to build truly dynamic user interfaces. For example, you might assemble shaped content that can be resized, or use animation to produce perpetually running effects right in your window. This isn t as easy if your graphics are provided in a single static file. Figure 23-7 shows an example. Here, the window contains a Grid with one cell. Two elements share that cell. The first element is a Path that draws the shaped window border and gives it a gradient fill. The other element is a layout container that holds the content for the window, which overlays the Path. In this case, the layout container is a StackPanel, but you could also use something else (such as another Grid or a Canvas for coordinate-based absolute positioning). This StackPanel holds the close button (with the familiar X icon) and the text.

Note Even though Figure 23-5 and Figure 23-6 show different examples, they are interchangeable. In other

words, you could create either one using the background-based approach or the shape-drawing approach. However, the shape-drawing approach gives you more abilities if you want to dynamically change the shape later and gives you the best quality if you need to resize the window.

The key piece of this example is the Path element that creates the backgrounds. It s a simple vectorbased shape that s composed of a series of lines and arcs. Here s the complete markup for the Path: <Path Stroke="DarkGray" StrokeThickness="2"> <Path.Fill> <LinearGradientBrush StartPoint="0.2,0" EndPoint="0.8,1" > <LinearGradientBrush.GradientStops> <GradientStop Color="White" Offset="0"></GradientStop> <GradientStop Color="White" Offset="0.45"></GradientStop> <GradientStop Color="LightBlue" Offset="0.9"></GradientStop> <GradientStop Color="Gray" Offset="1"></GradientStop> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Path.Fill>

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The RoutingStrategy enumeration indicates to the EventManager how the events should travel though the event hierarchy. There are three possible values that can be used, as shown in Table 5 1. Table 5 1. The Possible Strategies Used for Routing Events

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<Path.Data> <PathGeometry> <PathGeometry.Figures> <PathFigure StartPoint="20,0" IsClosed="True"> <LineSegment Point="140,0"/> <ArcSegment Point="160,20" Size="20,20" SweepDirection="Clockwise"/> <LineSegment Point="160,60"/> <ArcSegment Point="140,80" Size="20,20" SweepDirection="Clockwise"/> <LineSegment Point="70,80"/> <LineSegment Point="70,130"/> <LineSegment Point="40,80"/> <LineSegment Point="20,80"/> <ArcSegment Point="0,60" Size="20,20" SweepDirection="Clockwise"/> <LineSegment Point="0,20"/> <ArcSegment Point="20,0" Size="20,20" SweepDirection="Clockwise"/> </PathFigure> </PathGeometry.Figures> </PathGeometry> </Path.Data> </Path> Currently, the Path is fixed in size (as is the window), although you could make it resizable by hosting it in the Viewbox container that you learned about in 12. You could also improve this example by giving the close button a more authentic appearance probably a vector X icon that s drawn on a red surface. Although you could use a separate Path element to represent a button and handle the button s mouse events, it s better to change the standard Button control using a control template (as described in 17). You can then make the Path that draws the X icon part of your customized button.

One limitation of shaped forms is that they omit the nonclient title bar portion, which allows the user to easily drag the window around the desktop. In Windows Forms, this was a bit of a chore you had to react to mouse events such as MouseDown, MouseUp, and MouseMove and move the window manually when the user clicked and dragged, or you had to override the WndProc() method and handle the low-level WM_NCHITTEST message. WPF makes the same task much easier. You can initiate window-dragging mode at any time by calling the Window.DragMove() method. So, to allow the user to drag the shaped form you saw in the previous examples, you simply need to handle the MouseLeftButtonDown event for the window (or an element on the window, which will then play the same role as the title bar): <TextBlock Text="Title Bar" Margin="1" Padding="5" MouseLeftButtonDown="titleBar_MouseLeftButtonDown"></TextBlock> In your event handler, you need only a single line of code: private void titleBar_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { this.DragMove(); }

Resizing a shaped window isn t as easy If your window is roughly rectangular in shape, the easiest approach is to add a sizing grip to the bottom-right corner by setting the WindowResizeMode property to CanResizeWithGrip However, the sizing grip placement assumes that your window is rectangular For example, if you re creating a rounded window effect using a Border object, as shown earlier in Figure 23-6, this technique may work The sizing grip will appear in the bottom-right corner, and depending how much you ve rounded off that corner, it may appear over the window surface where it belongs But if you ve created a more exotic shape, such as the Path shown earlier in Figure 23-7, this technique definitely won t work; instead, it will create a sizing grip that floats in empty space next to the window.

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