DoubleAnimation Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
public ref class DoubleAnimation : System::Windows::Media::Animation::DoubleAnimationBasepublic class DoubleAnimation : System.Windows.Media.Animation.DoubleAnimationBasetype DoubleAnimation = class
inherit DoubleAnimationBasePublic Class DoubleAnimation
Inherits DoubleAnimationBase- Inheritance
Remarks
An animation updates the value of a property over a period of time. An animation effect can be subtle, such as moving a Shape a few pixels left and right, or dramatic, such as enlarging an object to 200 times its original size while spinning it and changing its color. To create an animation in Windows Presentation Foundation (WPF), you associate an animation with an object's property value.
Target Values
The DoubleAnimation class creates a transition between two target values. To set its target values, use its From, To, and By properties. The following table summarizes how the From, To, and By properties may be used together or separately to determine an animation's target values.
| Properties specified | Resulting behavior |
|---|---|
| From | The animation progresses from the value specified by the From property to the base value of the property being animated or to a previous animation's output value, depending on how the previous animation is configured. |
| From and To | The animation progresses from the value specified by the From property to the value specified by the To property. |
| From and By | The animation progresses from the value specified by the From property to the value specified by the sum of the From and By properties. |
| To | The animation progresses from the animated property's base value or a previous animation's output value to the value specified by the To property. |
| By | The animation progresses from the base value of the property being animated or a previous animation's output value to the sum of that value and the value specified by the By property. |
Note
If you set both the To and By properties, the To property takes precedence and the By property is ignored.
To use other interpolation methods or animate between more than two target values, use a DoubleAnimationUsingKeyFrames object.
Freezable Features
Because the DoubleAnimation class inherits from Freezable, DoubleAnimation objects gain several special features, which include the following: they can be declared as resources, shared among multiple objects, made read-only to improve performance, cloned, and made thread-safe. For more information about the different features provided by Freezable objects, see the Freezable Objects Overview.
Constructors
| DoubleAnimation() |
Initializes a new instance of the DoubleAnimation class. |
| DoubleAnimation(Double, Double, Duration, FillBehavior) |
Initializes a new instance of the DoubleAnimation class that animates from the specified starting value to the specified destination value over the specified duration and has the specified fill behavior. |
| DoubleAnimation(Double, Double, Duration) |
Initializes a new instance of the DoubleAnimation class that animates from the specified starting value to the specified destination value over the specified duration. |
| DoubleAnimation(Double, Duration, FillBehavior) |
Initializes a new instance of the DoubleAnimation class that animates to the specified value over the specified duration and has the specified fill behavior. The starting value for the animation is the base value of the property being animated or the output from another animation. |
| DoubleAnimation(Double, Duration) |
Initializes a new instance of the DoubleAnimation class that animates to the specified value over the specified duration. The starting value for the animation is the base value of the property being animated or the output from another animation. |
Fields
| ByProperty |
Identifies the By dependency property. |
| EasingFunctionProperty |
Identifies the EasingFunction dependency property. |
| FromProperty |
Identifies the From dependency property. |
| ToProperty |
Identifies the To dependency property. |
Properties
| AccelerationRatio |
Gets or sets a value specifying the percentage of the timeline's Duration spent accelerating the passage of time from zero to its maximum rate. (Inherited from Timeline) |
| 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) |
| By |
Gets or sets the total amount by which the animation changes its starting value. |
| CanFreeze |
Gets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable) |
| DecelerationRatio |
Gets or sets a value specifying the percentage of the timeline's Duration spent decelerating the passage of time from its maximum rate to zero. (Inherited from Timeline) |
| DependencyObjectType |
Gets the DependencyObjectType that wraps the CLR type of this instance. (Inherited from DependencyObject) |
| Dispatcher |
Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject) |
| Duration |
Gets or sets the length of time for which this timeline plays, not counting repetitions. (Inherited from Timeline) |
| EasingFunction |
Gets or sets the easing function applied to this animation. |
| FillBehavior |
Gets or sets a value that specifies how the Timeline behaves after it reaches the end of its active period. (Inherited from Timeline) |
| From |
Gets or sets the animation's starting value. |
| HasAnimatedProperties |
Gets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties. (Inherited from Animatable) |
| IsAdditive |
Gets or sets a value that indicates whether the target property's current value should be added to this animation's starting value. |
| IsCumulative |
Gets or sets a value that specifies whether the animation's value accumulates when it repeats. |
| IsDestinationDefault |
Gets a value that indicates whether this animation uses the defaultDestinationValue parameter of the GetCurrentValue(Object, Object, AnimationClock) method as its destination value. (Inherited from AnimationTimeline) |
| IsFrozen |
Gets a value that indicates whether the object is currently modifiable. (Inherited from Freezable) |
| IsSealed |
Gets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject) |
| Name |
Gets or sets the name of this Timeline. (Inherited from Timeline) |
| 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) |
| TargetPropertyType |
Gets the type of value this animation generates. (Inherited from DoubleAnimationBase) |
| To |
Gets or sets the animation's ending value. |
Methods
| AllocateClock() |
Creates a Clock for this AnimationTimeline. (Inherited from AnimationTimeline) |
| ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior) |
Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable) |
| ApplyAnimationClock(DependencyProperty, AnimationClock) |
Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable) |
| BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior) |
Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable) |
| BeginAnimation(DependencyProperty, AnimationTimeline) |
Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable) |
| CheckAccess() |
Determines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject) |
| ClearValue(DependencyProperty) |
Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject) |
| ClearValue(DependencyPropertyKey) |
Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject) |
| Clone() |
Creates a modifiable clone of this DoubleAnimation, making deep copies of this object's values. When copying dependency properties, this method copies resource references and data bindings (but they might no longer resolve) but not animations or their current values. |
| CloneCore(Freezable) |
Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values. (Inherited from Freezable) |
| CloneCurrentValue() |
Creates a modifiable clone of this Timeline object, making deep copies of this object's current values. (Inherited from Timeline) |
| CloneCurrentValueCore(Freezable) |
Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values. (Inherited from Freezable) |
| CoerceValue(DependencyProperty) |
Coerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject. (Inherited from DependencyObject) |
| CreateClock() |
Creates a new AnimationClock from this AnimationTimeline. (Inherited from AnimationTimeline) |
| CreateClock(Boolean) |
Creates a new Clock from this Timeline and specifies whether the new Clock is controllable. If this Timeline has children, a tree of clocks is created with this Timeline as the root. (Inherited from Timeline) |
| CreateInstance() |
Initializes a new instance of the Freezable class. (Inherited from Freezable) |
| CreateInstanceCore() |
Creates a new instance of the DoubleAnimation. |
| Equals(Object) |
Determines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject) |
| Freeze() |
Makes the current object unmodifiable and sets its IsFrozen property to |
| FreezeCore(Boolean) |
Makes this Timeline unmodifiable or determines whether it can be made unmodifiable. (Inherited from Timeline) |
| GetAnimationBaseValue(DependencyProperty) |
Returns the non-animated value of the specified DependencyProperty. (Inherited from Animatable) |
| GetAsFrozen() |
Creates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable) |
| GetAsFrozenCore(Freezable) |
Makes this instance a clone of the specified Timeline object. (Inherited from Timeline) |
| GetCurrentValue(Double, Double, AnimationClock) |
Gets the current value of the animation. (Inherited from DoubleAnimationBase) |
| GetCurrentValue(Object, Object, AnimationClock) |
Gets the current value of the animation. (Inherited from DoubleAnimationBase) |
| GetCurrentValueAsFrozen() |
Creates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable) |
| GetCurrentValueAsFrozenCore(Freezable) |
Makes this instance a frozen clone of the specified Timeline. Resource references, data bindings, and animations are not copied, but their current values are. (Inherited from Timeline) |
| GetCurrentValueCore(Double, Double, AnimationClock) |
Calculates a value that represents the current value of the property being animated, as determined by the DoubleAnimation. |
| GetHashCode() |
Gets a hash code for this DependencyObject. (Inherited from DependencyObject) |
| GetLocalValueEnumerator() |
Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject) |
| GetNaturalDuration(Clock) |
Returns the length of a single iteration of this Timeline. (Inherited from Timeline) |
| GetNaturalDurationCore(Clock) |
Returns the length of a single iteration of this AnimationTimeline. (Inherited from AnimationTimeline) |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| GetValue(DependencyProperty) |
Returns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject) |
| InvalidateProperty(DependencyProperty) |
Re-evaluates the effective value for the specified dependency property. (Inherited from DependencyObject) |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| OnChanged() |
Called when the current Freezable object is modified. (Inherited from Freezable) |
| OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty) |
This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code. (Inherited from Freezable) |
| OnFreezablePropertyChanged(DependencyObject, DependencyObject) |
Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set. (Inherited from Freezable) |
| OnPropertyChanged(DependencyPropertyChangedEventArgs) |
Overrides the DependencyObject implementation of OnPropertyChanged(DependencyPropertyChangedEventArgs) to also invoke any Changed handlers in response to a changing dependency property of type Freezable. (Inherited from Freezable) |
| ReadLocalValue(DependencyProperty) |
Returns the local value of a dependency property, if it exists. (Inherited from DependencyObject) |
| ReadPreamble() |
Ensures that the Freezable is being accessed from a valid thread. Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties. (Inherited from Freezable) |
| SetCurrentValue(DependencyProperty, Object) |
Sets the value of a dependency property without changing its value source. (Inherited from DependencyObject) |
| SetValue(DependencyProperty, Object) |
Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject) |
| SetValue(DependencyPropertyKey, Object) |
Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject) |
| ShouldSerializeProperty(DependencyProperty) |
Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property. (Inherited from DependencyObject) |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
| VerifyAccess() |
Enforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject) |
| WritePostscript() |
Raises the Changed event for the Freezable and invokes its OnChanged() method. Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties. (Inherited from Freezable) |
| WritePreamble() |
Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties. (Inherited from Freezable) |
Events
| Changed |
Occurs when the Freezable or an object it contains is modified. (Inherited from Freezable) |
| Completed |
Occurs when this timeline has completely finished playing: it will no longer enter its active period. (Inherited from Timeline) |
| CurrentGlobalSpeedInvalidated |
Occurs when the rate at which time progresses for the timeline's clock changes. (Inherited from Timeline) |
| CurrentStateInvalidated |
Occurs when the CurrentState property of the timeline's Clock is updated. (Inherited from Timeline) |
| CurrentTimeInvalidated |
Occurs when the CurrentTime property of the timeline's Clock is updated. (Inherited from Timeline) |
| RemoveRequested |
Occurs when the clock created for this timeline or one of its parent timelines is removed. (Inherited from Timeline) |
