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CHAPTER 19 ANIMATION
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The markup shown in Figure 19-10 is the XAML version of the previous example program that created a storyboard animation of the FontSize and Height properties. There are several important things to notice in the figure: The nested boxes show the required structure of EventTrigger, BeginStoryBoard, StoryBoard, and animation objects. The EventTrigger requires a RoutedEvent as its trigger. As I mentioned, this is a durationless event, which starts the BeginStoryBoard action. The animation object requires a TargetProperty to know what property to animate. Notice, however, that here in the XAML you must use the CLR wrapper name of the property that is, without the Property suffix. This is in contrast to creating an animation in the code-behind, where you must use the suffix.
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Figure 19-10. The XAML architecture for using an animation
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CHAPTER 19 ANIMATION
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Other Variations on Animation
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In the animation examples you ve seen so far, the rate of change in the dependency property value has been a linear interpolation between the starting value and the ending value. There are, however, two other variations on animation that allow you to change the values in other ways. These are called animation with keyframes and animation along a path. Animation with keyframes allows you to set specific values of the property at various points in the progression. Animation along a path allows you to move the position of an object along a path.
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Not all types of dependency properties can be animated with each of the three types of animation. Table 19-3 shows the three types of animation and the types with which they can be used. Table 19-3. Types for the Standard Built-in Animation Classes
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Boolean Byte Char Decimal Double Int16 Int32 Int64 Object Single String
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Basic Animation
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Keyframes
Path
WPF Type
Color Matrix Point Point3d
Basic Animation
Keyframes
Path
Quaternion Rect Rotation3D Size Thickness Vector Vector3D
CHAPTER 19 ANIMATION
Keyframe Animations
The first nonlinear type of animation I ll cover is animation with keyframes. This type of animation allows you to specify specific values at specific points in the timeline. The following are some important things to know about keyframe animation: A keyframe is an object that represents a point in the animation s timeline. It contains two properties: KeyTime and Value. The KeyTime attribute specifies a time on the timeline. This is represented as an offset from the animation s starting time. The Value attribute specifies the value the dependency property must have at that time.
Between each pair of keyframes, the animation performs a linear interpolation to determine the value of the animated property. Each keyframe animation object contains a collection of keyframe objects.
Each of the standard animation classes has a corresponding keyframe class. For example, the corresponding keyframe class of the DoubleAnimation class is the DoubleAnimationUsingKeyFrames class. The keyframe animation classes have most of the same properties as their corresponding animation classes. For the keyframe classes, however, there is no need for the From, To, or By properties, since these values are given explicitly as keyframe objects. There are three types of keyframe classes linear, spine, and discrete. I ll cover each type in the following sections.
CHAPTER 19 ANIMATION
Linear Keyframe Animation
I ll start by showing an example of a linear keyframe animation. The markup in Figure 19-11 shows an example of an animation object that moves an object left and right in a Canvas panel. There are several important things to notice in the markup: You need to use the appropriate XXXAnimationUsingKeyFrames class, where XXX is one of the supported .NET or WPF types. In this case, it s DoubleAnimationUsingKeyFrames. If the TargetProperty is an attached property on the object you are animating, you must enclose the attached property name in parentheses, as shown. You need to use a collection of keyframe objects. This example uses the LinearDoubleKeyFrame type.
Figure 19-11. The XAML for an animation using keyframes
CHAPTER 19 ANIMATION
Figure 19-12 shows screenshots of a button being animated by this keyframe animation object. At various points in the timeline the button has different values for its Canvas.Left property and is therefore in different places on the screen. What the screenshots can t show is that the button is continuously moving throughout the entire five seconds.
Figure 19-12. Animating the Canvas.Left property with keyframes Now consider the following markup, which animates the Canvas.Top attached property and does not use keyframes. Figure 19-13 shows the result of animating a button with this animation object. The button drops slowly over the period of five seconds. <DoubleAnimation Storyboard.TargetProperty="(Canvas.Top)" Duration="0:0:5" From="20" To="120"/>
Figure 19-13. Animating the Canvas.Top property with normal animation If you use these two animations together in the same Storyboard, the first animation moves the button back and forth, and the second animation moves it steadily downward. The dashed line in Figure 19-14 illustrates the movement of the button.
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