December 03, 2013
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
Thetype exposes the following members.
|AutoReverse||Gets or sets a value that indicates whether the timeline plays in reverse after it completes a forward iteration. (Inherited from Timeline.)|
|BeginTime||Gets or sets the time at which this Timeline should begin. (Inherited from Timeline.)|
|Dispatcher||Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)|
|Duration||Gets or sets the length of time for which this timeline plays, not counting repetitions. (Inherited from Timeline.)|
|FillBehavior||Gets or sets a value that specifies how the animation behaves after it reaches the end of its active period. (Inherited from Timeline.)|
|KeyFrames||Gets the collection of PointKeyFrame objects that define the animation.|
|RepeatBehavior||Gets or sets the repeating behavior of this timeline. (Inherited from Timeline.)|
|SpeedRatio||Gets or sets the rate, relative to its parent, at which time progresses for this Timeline. (Inherited from Timeline.)|
|CheckAccess||Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)|
|ClearValue||Clears the local value of a dependency property. (Inherited from DependencyObject.)|
|Equals(Object)||Determines whether the specified Object is equal to the current Object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)|
|GetAnimationBaseValue||Returns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)|
|GetHashCode||Serves as a hash function for a particular type. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|GetValue||Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|ReadLocalValue||Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)|
|SetValue||Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
A key frame animation's target values are defined by its KeyFrames property, which contains a collection of PointKeyFrame objects. Each PointKeyFrame defines a segment of the animation with its own target Value and KeyTime. When the animation runs, it progresses from one key value to the next at the specified key times.
When declaring a in XAML, the order of the PointKeyFrame object elements is not significant, because the KeyTime controls the timing and therefore the order in which the key frames are executed. However, it is good markup style to keep the element order the same as the KeyTime sequence order.
The following example moves an ellipse along a triangular path. The example uses the class to animate the Center property of an EllipseGeometry. This animation uses three key frames in the following manner:
During the first half second, it uses an instance of the LinearPointKeyFrame class to move the ellipse along a path at a steady rate from its starting position. Linear key frames such as LinearPointKeyFrame create a smooth linear interpolation between values.
During the end of the next half second, it uses an instance of the DiscretePointKeyFrame class to suddenly move the ellipse along the path to the next position. Discrete key frames like DiscretePointKeyFrame create sudden jumps between values.
During the final two seconds, it uses an instance of the SplinePointKeyFrame class to move the ellipse back to its starting position. Spline key frames like SplinePointKeyFrame create a variable transition between values according to the values of the KeySpline property. In this example, the animation begins slowly and speeds up exponentially toward the end of the time segment.
<Canvas Width="400" Height="300"> <Canvas.Resources> <Storyboard x:Name="myStoryboard"> <!-- Animating the Center property uses 3 KeyFrames, which animate the ellipse allong a triangular path. --> <PointAnimationUsingKeyFrames Storyboard.TargetProperty="Center" Storyboard.TargetName="MyAnimatedEllipseGeometry" Duration="0:0:5" RepeatBehavior="Forever"> <!-- Over the first half second, Using a LinearPointKeyFrame, the ellipse moves steadily from its starting position along the first line of the trianglar path. --> <LinearPointKeyFrame KeyTime="0:0:0.5" Value="100,300" /> <!-- Using a DiscretePointKeyFrame, the ellipse suddenly changes position after the first second of the animation. --> <DiscretePointKeyFrame KeyTime="0:0:1" Value="400,300" /> <!-- Using a SplinePointKeyFrame, the ellipse moves back to its starting position. It moves slowly at first and then speeds up. This key frame takes 2 seconds to complete. --> <SplinePointKeyFrame KeySpline="0.6,0.0 0.9,0.00" KeyTime="0:0:3" Value="200,100" /> </PointAnimationUsingKeyFrames> </Storyboard> </Canvas.Resources> <Path Fill="Blue" Loaded="Start_Animation"> <Path.Data> <!-- Describes an ellipse. --> <EllipseGeometry x:Name="MyAnimatedEllipseGeometry" Center="200,100" RadiusX="15" RadiusY="15" /> </Path.Data> </Path> </Canvas>