Using XAML to Build Declarative Silverlight Applications in .NET

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Using XAML to Build Declarative Silverlight Applications
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Adding a SolidColorBrush
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The SolidColorBrush is the most common type that you can apply to Silverlight objects. A SolidColorBrush is automatically created for you when you set the color in one of the properties of a Silverlight object. For example, the following code automatically creates a SolidColorBrush implicitly for the Background property of a Canvas control:
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<Canvas Background= Blue Height= 100 Width= 200 />
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The previous code could also be written explicitly as follows:
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<Canvas Height= 100 Width= 200 > <Canvas.Background> <SolidColorBrush Color= Blue /> </Canvas.Background> </Canvas>
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Adding the SolidColorBrush explicitly takes considerably more code; however, you can set some additional properties of the SolidColorBrush element to enhance the look and feel of the control. For example, you can make the SolidColorBrush appear semitransparent by setting the Opacity property, as shown in the following code:
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<Canvas Height= 100 Width= 200 > <Canvas.Background> <SolidColorBrush Color= Blue Opacity= .50 /> </Canvas.Background> </Canvas>
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Adding a LinearGradientBrush
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LinearGradientBrush elements are similar to the SolidColorBrush. They define a linear gradient that flows between two or more colors. You can apply them to the properties of Silverlight controls the same way that the SolidColorBrush is applied.
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To apply a LinearGradientBrush to a Silverlight control, you need to define the LinearGradientBrush element and give it an EndPoint and a StartPoint that define the linear direction of the brush. The EndPoint and StartPoint are set on a 0 to 1 coordinate system separated by a comma. Then you need to define two or more GradientStop elements inside the LinearGradientBrush. Each GradientStop element needs the Color property set. You can also define the offset between 0 and 1 where that color is set using the Offset property. Silverlight applies the gradient linearly along the path defined by the StartPoint and EndPoint values matching the colors at each GradientStop along the way.
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The code in Listing 3.6 applies a LinearGradientBrush to the Foreground property of a TextBlock. The LinearGradientBrush applies three gradient stops that flow from blue in the beginning to white in the middle to blue at the end, as shown in Figure 3.27.
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LISTING 3.6
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XAML That Implements a LinearGradientBrush to a TextBlock Control
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<TextBlock VerticalAlignment= Stretch TextAlignment= Center TextWrapping= Wrap FontSize= 48 FontWeight= Bold > <Run Text= Linear Gradient Brush > <Run.Foreground> <LinearGradientBrush EndPoint= 0.5,1 StartPoint= 0.5,0 > <GradientStop Color= Blue /> <GradientStop Color= White Offset= .5 /> <GradientStop Color= Blue Offset= 1 /> </LinearGradientBrush> </Run.Foreground> </Run> </TextBlock>
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FIGURE 3.27 Rendered LinearGradientBrush in a TextBlock control
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Adding a RadialGradientBrush
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RadialGradientBrush elements are very similar to the LinearGradientBrush. They
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define a radial gradient that flows between two or more colors. You can apply them to the properties of Silverlight controls the same way that the LinearGradientBrush is applied.
Using XAML to Build Declarative Silverlight Applications
To apply a RadialGradientBrush to a Silverlight control, you need to define the RadialGradientBrush element. You can define the center of the gradient radius using the GradientOrigin property. The GradientOrigin is set on a 0 to 1 coordinate system separated by a comma. You can also define the radius of the gradient in the X and Y planes using the RadiusX and RadiusY properties. These properties are set on a scale where 1 is the Height or Width of the Silverlight control. Then you also need to define two or more GradientStop elements inside the RadialGradientBrush. Each GradientStop element needs the Color property set. You can also define the offset between 0 and 1 where that color is set using the Offset property. Silverlight applies the gradient on a radius centered at the GradientOrigin and defined by the RadiusX and RadiusY properties matching the colors at each GradientStop along the way. The code in Listing 3.7 applies a RadialGradientBrush to the Background property of a Rectangle. The RadialGradientBrush applies three gradient stops that flow from blue in the beginning to white in the middle to blue at the end, as shown in Figure 3.28. Notice that the RadiusX is larger than the RadiusY making the gradient elliptical, and the GradientOrigin is set toward the bottom of the Rectangle.