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ObjectAnimationUsingKeyFrames.KeyFrames, propriété
Obtient ou définit la collection des objets ObjectKeyFrame qui définissent l'animation.
Assembly : PresentationCore (dans PresentationCore.dll)
XMLNS pour XAML : http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
<object> <ObjectKeyFrameCollection .../> </object>
Valeur de propriété
Type : System.Windows.Media.Animation.ObjectKeyFrameCollectionCollection des objets ObjectKeyFrame qui définissent l'animation. La valeur par défaut est Empty.
This example shows how to animate an object, which in this example is the Background property of a Page control, by using key frames.
The following example uses the ObjectAnimationUsingKeyFrames class to animate color changes for the Background property of a Page control. The example animation changes to a different background brush at regular intervals. This animation uses the DiscreteObjectKeyFrame class to create three different key frames. The animation uses key frames in the following manner:
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At the end of the first second, animates an instance of the LinearGradientBrush class. This section of the example applies a linear gradient to the background color so that the color transitions from yellow to orange to red.
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At the end of the next second, animates an instance of the RadialGradientBrush class. This section of the example applies a radial gradient to the background color so that the color transitions from white to blue to black.
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At the end of the third second, animates an instance of the DrawingBrush class. This section of the example applies a checkerboard pattern to the background.
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The animation begins again and repeats indefinitely.
Remarque
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DiscreteObjectKeyFrame is the only type of key frame that you can use with the ObjectAnimationUsingKeyFrames class. Key frames like DiscreteObjectKeyFrame create sudden changes in values, that is, the color changes in this example occur suddenly. |
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" > <Page.Triggers> <EventTrigger RoutedEvent="Page.Loaded"> <BeginStoryboard> <Storyboard> <!-- ObjectAnimationUsingKeyFrames is used to animate properties that take an object as a value. This animation lasts for 4 seconds using 3 KeyFrames which swap different brush objects at regular intervals, making the background of the Page change. --> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Duration="0:0:4" RepeatBehavior="Forever"> <ObjectAnimationUsingKeyFrames.KeyFrames> <!-- Note: Only discrete interpolation (DiscreteObjectKeyFrame) is available for use with ObjectAnimationUsingKeyFrames which merely swaps objects according to a specified timeline. Other types of interpolation are too problematic to apply to objects. --> <!-- Using a DiscreteObjectKeyFrame, the Page Background suddenly changes to a LinearGradientBrush after the first second of the animation. --> <DiscreteObjectKeyFrame KeyTime="0:0:1"> <DiscreteObjectKeyFrame.Value> <LinearGradientBrush> <LinearGradientBrush.GradientStops> <GradientStop Color="Yellow" Offset="0.0" /> <GradientStop Color="Orange" Offset="0.5" /> <GradientStop Color="Red" Offset="1.0" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> <!-- Using a DiscreteObjectKeyFrame, the Page Background suddenly changes to a RadialGradientBrush after the second second of the animation. --> <DiscreteObjectKeyFrame KeyTime="0:0:2"> <DiscreteObjectKeyFrame.Value> <RadialGradientBrush GradientOrigin="0.75,0.25"> <RadialGradientBrush.GradientStops> <GradientStop Color="White" Offset="0.0" /> <GradientStop Color="MediumBlue" Offset="0.5" /> <GradientStop Color="Black" Offset="1.0" /> </RadialGradientBrush.GradientStops> </RadialGradientBrush> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> <!-- Using a DiscreteObjectKeyFrame, the Page Background suddenly changes to a DrawingBrush (creates a checkerboard pattern) after the third second of the animation. --> <DiscreteObjectKeyFrame KeyTime="0:0:3"> <DiscreteObjectKeyFrame.Value> <DrawingBrush Viewport="0,0,0.25,0.25" TileMode="Tile"> <DrawingBrush.Drawing> <DrawingGroup> <DrawingGroup.Children> <GeometryDrawing Brush="White"> <GeometryDrawing.Geometry> <RectangleGeometry Rect="0,0,1,1" /> </GeometryDrawing.Geometry> </GeometryDrawing> <GeometryDrawing Brush="Black" Geometry="M 0,0 L0,0.5 0.5,0.5 0.5,1 1,1 1,0.5 0.5,0.5 0.5,0" /> </DrawingGroup.Children> </DrawingGroup> </DrawingBrush.Drawing> </DrawingBrush> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames.KeyFrames> </ObjectAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> </Page.Triggers> </Page>
For the complete sample, see KeyFrame Animation Sample.
Windows 7, Windows Vista SP1 ou ultérieur, Windows XP SP3, Windows Server 2008 (installation minimale non prise en charge), Windows Server 2008 R2 (installation minimale prise en charge avec SP1 ou version ultérieure), Windows Server 2003 SP2
Le .NET Framework ne prend pas en charge toutes les versions de chaque plateforme. Pour obtenir la liste des versions prises en charge, consultez Configuration requise du .NET Framework.
