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<Rectangle.Triggers> <EventTrigger RoutedEvent="Rectangle.Loaded"> </EventTrigger> </Rectangle.Triggers>
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Animations live inside special elements called storyboards, so that s what you need to define next. The trigger element can t contain just a storyboard by itself; it has to contain a storyboard action. Therefore, you first need to add a <BeginStoryboard> element inside the EventTrigger element. Inside the BeginStoryboard element, you define the Storyboard:
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<Rectangle.Triggers> <EventTrigger RoutedEvent="Rectangle.Loaded"> <BeginStoryboard> <Storyboard> </Storyboard> </BeginStoryboard> </EventTrigger> </Rectangle.Triggers>
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You can also define a storyboard elsewhere in your code, as a resource. You ll see how that works in the next example, but we won t do that here. After all these nested elements, it s finally time to get to the animation. WPF defines several different kinds of animations, depending on what you re animating. You can think of an animation as changing a property of an element over time. For example, if you define an animation to make a rectangle increase in width, you re changing its Width property, which is defined as a double data type, so you d use the DoubleAnimation for the animation type. In this case, you re going to change the color of the square, so you ll use the ColorAnimation type. Add the following code inside the Storyboard element:
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<EventTrigger RoutedEvent="Rectangle.Loaded"> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName="rectangleBrush" Storyboard.TargetProperty="Color" From="Blue" To="Red" Duration="0:0:10" AutoReverse="True" RepeatBehavior="Forever" /> </Storyboard> </BeginStoryboard> </EventTrigger>
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This all breaks down pretty easily. First, you open the <ColorAnimation> tag. Then you define the TargetName of the storyboard; that s the rectangleBrush you defined earlier, and now you know why you gave it a name, so you could refer to it down here. You also have a TargetProperty to indicate what property of the target Brush you re going to change, which in this case is Color. So far, so good.
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19: Windows Presentation Foundation
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The next few elements define how the animation works. The From property indicates the starting value of the animation; in this case, the starting color. The To property indicates the value where you want to end up; in this case, Red. The Duration indicates how long it takes for the value to change from the starting value to the final value. The duration is measured in hours, minutes, and seconds, so 0:0:10 means the color change will take 10 seconds to happen. The last line just adds a bit of class to the animation: the AutoReverse property indicates that the animation will turn the square blue, then back to red, automatically. The RepeatBehavior is used to limit how many times the animation will repeat; the value of Forever means that it ll repeat until the user closes the application. Run your application now. You ll see your square, centered in the window, slowly changing from blue through purple to red, and back again, every 10 seconds. Feel free to stop the application and play with the values to get different effects.
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If you wanted to shift colors between more than two values say, down the spectrum from red to yellow to green to blue you d use a different type of animation called ColorAnimationUsingKeyFrames. That s a little complex for this example, though.
The result looks like Figure 19-5, and the full XAML is shown in Example 19-4.
<Window x:Class="Example_19_4_ _ _ _Animations.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Animations |
Title="Window1" Height="300" Width="300"> <Grid> <Rectangle Name="myRectangle" Width="100" Height="100"> <Rectangle.Fill> <SolidColorBrush x:Name="rectangleBrush" Color="Blue" /> </Rectangle.Fill> <Rectangle.Triggers> <EventTrigger RoutedEvent="Rectangle.Loaded"> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName= "rectangleBrush" Storyboard.TargetProperty="Color" From="Blue" To="Red" Duration="0:0:10" AutoReverse="True" RepeatBehavior="Forever" /> </Storyboard> </BeginStoryboard> </EventTrigger> </Rectangle.Triggers> </Rectangle> </Grid> </Window>
It s important to note here that you haven t written a single line of C# code for this example. This entire animation happened declaratively, in the XAML file. WPF contains the code to automate all of this for you.
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