EasingDoubleKeyFrame Class

Definition

Namespace:

Windows.UI.Xaml.Media.Animation

Associates an easing function with a DoubleAnimationUsingKeyFrames key-frame animation.

public ref class EasingDoubleKeyFrame sealed : DoubleKeyFrame

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
/// [Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
class EasingDoubleKeyFrame final : DoubleKeyFrame

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
[Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
public sealed class EasingDoubleKeyFrame : DoubleKeyFrame

Public NotInheritable Class EasingDoubleKeyFrame
Inherits DoubleKeyFrame

<EasingDoubleKeyFrame .../>

Inheritance

Object Platform::Object IInspectable DependencyObject DoubleKeyFrame EasingDoubleKeyFrame

Attributes

ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

This XAML example shows how to use key frames that have easing functions associated with them to create an animation of a rectangle that contracts upward, slows down, then expands downward (as though falling), and then bounces to a stop.

<StackPanel x:Name="LayoutRoot" >
    <StackPanel.Resources>
        <Storyboard x:Name="myStoryboard">
            <DoubleAnimationUsingKeyFrames
             Storyboard.TargetProperty="Height"
             Storyboard.TargetName="myRectangle" EnableDependentAnimation="true">

                <!-- This keyframe animates the ellipse up to the crest 
                     where it slows down and stops. -->
                <EasingDoubleKeyFrame Value="30" KeyTime="00:00:02">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <CubicEase EasingMode="EaseOut"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>

                <!-- This keyframe animates the ellipse back down and makes
                     it bounce. -->
                <EasingDoubleKeyFrame Value="200" KeyTime="00:00:06">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <BounceEase Bounces="5" EasingMode="EaseOut"/>
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>

            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
    </StackPanel.Resources>

    <Rectangle x:Name="myRectangle" PointerPressed="Pointer_Clicked" 
     Fill="Blue" Width="200" Height="200" />
</StackPanel>

// When the user clicks the rectangle, the animation
// begins. 
private void Pointer_Clicked(object sender, PointerRoutedEventArgs e)
{
    myStoryboard.Begin();
}

' When the user clicks the rectangle, the animation
' begins. 
Private Sub Pointer_Clicked(ByVal sender As Object, ByVal e As PointerRoutedEventArgs)
    myStoryboard.Begin()
End Sub

Remarks

Easing functions allow you to apply custom mathematical formulas to your animations. Mathematical operations are often useful to produce animations that simulate real-world physics in a 2-D coordinate system. For example, you may want an object to realistically bounce or behave as though it were on a spring. For a list of easing functions and info on how to use them, see Key-frame animations and easing function animations.

If no easing function is set, the default easing function will be linear.

Constructors

EasingDoubleKeyFrame()

Initializes a new instance of the EasingDoubleKeyFrame class.

Properties

Dispatcher	Gets the CoreDispatcher that this object is associated with. The CoreDispatcher represents a facility that can access the DependencyObject on the UI thread even if the code is initiated by a non-UI thread. (Inherited from DependencyObject)
EasingFunction	Gets or sets the easing function that is applied to the key frame.
EasingFunctionProperty	Identifies the EasingFunction dependency property.
KeyTime	Gets or sets the time at which the key frame's target Value should be reached. (Inherited from DoubleKeyFrame)
Value	Gets or sets the key frame's target value. (Inherited from DoubleKeyFrame)

Methods

ClearValue(DependencyProperty)	Clears the local value of a dependency property. (Inherited from DependencyObject)
GetAnimationBaseValue(DependencyProperty)	Returns any base value established for a dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject)
GetValue(DependencyProperty)	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject)
ReadLocalValue(DependencyProperty)	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject)
RegisterPropertyChangedCallback(DependencyProperty, DependencyPropertyChangedCallback)	Registers a notification function for listening to changes to a specific DependencyProperty on this DependencyObject instance. (Inherited from DependencyObject)
SetValue(DependencyProperty, Object)	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject)
UnregisterPropertyChangedCallback(DependencyProperty, Int64)	Cancels a change notification that was previously registered by calling RegisterPropertyChangedCallback. (Inherited from DependencyObject)

See also

• DoubleKeyFrame
• EasingColorKeyFrame
• EasingPointKeyFrame
• KeyTime
• Value
• Storyboarded animations
• Key-frame animations and easing function animations
• XAML animation sample