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Timeline Class
 

Defines a segment of time.

Namespace:   System.Windows.Media.Animation
Assembly:  PresentationCore (in PresentationCore.dll)

SystemObject
   System.Windows.ThreadingDispatcherObject
     System.WindowsDependencyObject
       System.WindowsFreezable
         System.Windows.Media.AnimationAnimatable
          System.Windows.Media.AnimationTimeline
             System.Windows.Media.AnimationAnimationTimeline
             System.Windows.Media.AnimationTimelineGroup
             System.Windows.MediaMediaTimeline

[LocalizabilityAttribute(LocalizationCategory.None, Readability = Readability.Unreadable)]
[RuntimeNamePropertyAttribute("Name")]
public abstract class Timeline : Animatable
[LocalizabilityAttribute(LocalizationCategory::None, Readability = Readability::Unreadable)]
[RuntimeNamePropertyAttribute("Name")]
public ref class Timeline abstract : Animatable
[<AbstractClass>]
[<LocalizabilityAttribute(LocalizationCategory.None, Readability = Readability.Unreadable)>]
[<RuntimeNamePropertyAttribute("Name")>]
type Timeline = 
    class
        inherit Animatable
    end
<LocalizabilityAttribute(LocalizationCategory.None, Readability := Readability.Unreadable)>
<RuntimeNamePropertyAttribute("Name")>
Public MustInherit Class Timeline
	Inherits Animatable
NameDescription
System_CAPS_protmethod Timeline

Initializes a new instance of the Timeline class.

System_CAPS_protmethod Timeline

Initializes a new instance of the Timeline class with the specified .

System_CAPS_protmethod Timeline

Initializes a new instance of the Timeline class with the specified and .

System_CAPS_protmethod Timeline

Initializes a new instance of the Timeline class with the specified , , and .

NameDescription
System_CAPS_pubproperty

Gets or sets a value specifying the percentage of the timeline's spent accelerating the passage of time from zero to its maximum rate.

System_CAPS_pubproperty

Gets or sets a value that indicates whether the timeline plays in reverse after it completes a forward iteration.

System_CAPS_pubproperty

Gets or sets the time at which this Timeline should begin.

System_CAPS_pubproperty

Gets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)

System_CAPS_pubproperty

Gets or sets a value specifying the percentage of the timeline's spent decelerating the passage of time from its maximum rate to zero.

System_CAPS_pubproperty

Gets the DependencyObjectType that wraps the CLR type of this instance. (Inherited from DependencyObject.)

System_CAPS_pubproperty

Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)

System_CAPS_pubproperty

Gets or sets the length of time for which this timeline plays, not counting repetitions.

System_CAPS_pubproperty

Gets or sets a value that specifies how the Timeline behaves after it reaches the end of its active period.

System_CAPS_pubproperty

Gets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties.(Inherited from Animatable.)

System_CAPS_pubproperty

Gets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)

System_CAPS_pubproperty

Gets a value that indicates whether this instance is currently sealed (read-only).(Inherited from DependencyObject.)

System_CAPS_pubproperty

Gets or sets the name of this Timeline.

System_CAPS_pubproperty

Gets or sets the repeating behavior of this timeline.

System_CAPS_pubproperty

Gets or sets the rate, relative to its parent, at which time progresses for this Timeline.

NameDescription
System_CAPS_pubproperty System_CAPS_static DesiredFrameRate

Gets or sets the desired frame rate for this timeline and its child timelines.

NameDescription
System_CAPS_protmethod AllocateClock

Creates a Clock for this Timeline.

System_CAPS_pubmethod ApplyAnimationClock

Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the SnapshotAndReplace handoff behavior is used.(Inherited from Animatable.)

System_CAPS_pubmethod ApplyAnimationClock

Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the specified HandoffBehavior is used.(Inherited from Animatable.)

System_CAPS_pubmethod BeginAnimation

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.)

System_CAPS_pubmethod BeginAnimation

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.)

System_CAPS_pubmethod CheckAccess

Determines whether the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)

System_CAPS_pubmethod ClearValue

Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)

System_CAPS_pubmethod ClearValue

Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)

System_CAPS_pubmethod Clone

Creates a modifiable clone of this Timeline, making deep copies of this object's values.

System_CAPS_protmethod CloneCore

Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values. (Inherited from Freezable.)

System_CAPS_pubmethod CloneCurrentValue

Creates a modifiable clone of this Timeline object, making deep copies of this object's current values.

System_CAPS_protmethod CloneCurrentValueCore

Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values.(Inherited from Freezable.)

System_CAPS_pubmethod CoerceValue

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.)

System_CAPS_pubmethod CreateClock

Creates a new, controllable Clock from this Timeline. If this Timeline has children, a tree of clocks is created with this Timeline as the root.

System_CAPS_pubmethod CreateClock

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.

System_CAPS_protmethod CreateInstance

Initializes a new instance of the Freezable class. (Inherited from Freezable.)

System_CAPS_protmethod CreateInstanceCore

When implemented in a derived class, creates a new instance of the Freezable derived class. (Inherited from Freezable.)

System_CAPS_pubmethod Equals

Determines whether a provided DependencyObject is equivalent to the current DependencyObject.(Inherited from DependencyObject.)

System_CAPS_protmethod Finalize

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethod Freeze

Makes the current object unmodifiable and sets its property to true. (Inherited from Freezable.)

System_CAPS_protmethod FreezeCore

Makes this Timeline unmodifiable or determines whether it can be made unmodifiable.(Overrides AnimatableFreezeCore.)

System_CAPS_pubmethod GetAnimationBaseValue

Returns the non-animated value of the specified DependencyProperty.(Inherited from Animatable.)

System_CAPS_pubmethod 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.)

System_CAPS_protmethod GetAsFrozenCore

Makes this instance a clone of the specified Timeline object. (Overrides FreezableGetAsFrozenCore.)

System_CAPS_pubmethod 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.)

System_CAPS_protmethod GetCurrentValueAsFrozenCore

Makes this instance a frozen clone of the specified Timeline. Resource references, data bindings, and animations are not copied, but their current values are.(Overrides FreezableGetCurrentValueAsFrozenCore.)

System_CAPS_pubmethod System_CAPS_static GetDesiredFrameRate

Gets the desired frame rate of the specified Timeline.

System_CAPS_pubmethod GetHashCode

Gets a hash code for this DependencyObject.(Inherited from DependencyObject.)

System_CAPS_pubmethod GetLocalValueEnumerator

Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)

System_CAPS_protmethod GetNaturalDuration

Returns the length of a single iteration of this Timeline.

System_CAPS_protmethod GetNaturalDurationCore

Returns the length of a single iteration of this Timeline. This method provides the implementation for GetNaturalDuration.

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod GetValue

Returns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)

System_CAPS_pubmethod InvalidateProperty

Re-evaluates the effective value for the specified dependency property(Inherited from DependencyObject.)

System_CAPS_protmethod MemberwiseClone

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_protmethod OnChanged

Called when the current Freezable object is modified. (Inherited from Freezable.)

System_CAPS_protmethod OnFreezablePropertyChanged

Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set.(Inherited from Freezable.)

System_CAPS_protmethod OnFreezablePropertyChanged

This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.(Inherited from Freezable.)

System_CAPS_protmethod OnPropertyChanged

Overrides the DependencyObject implementation of OnPropertyChanged to also invoke any Changed handlers in response to a changing dependency property of type Freezable.(Inherited from Freezable.)

System_CAPS_pubmethod ReadLocalValue

Returns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)

System_CAPS_protmethod 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.)

System_CAPS_pubmethod SetCurrentValue

Sets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)

System_CAPS_pubmethod System_CAPS_static SetDesiredFrameRate

Sets the desired frame rate of the specified Timeline.

System_CAPS_pubmethod SetValue

Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)

System_CAPS_pubmethod SetValue

Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)

System_CAPS_protmethod ShouldSerializeProperty

Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.(Inherited from DependencyObject.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethod VerifyAccess

Enforces that the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)

System_CAPS_protmethod 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.)

System_CAPS_protmethod 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.)

NameDescription
System_CAPS_pubfield System_CAPS_static AccelerationRatioProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static AutoReverseProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static BeginTimeProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static DecelerationRatioProperty

Identifies for the  dependency property.

System_CAPS_pubfield System_CAPS_static DesiredFrameRateProperty

Identifies the DesiredFrameRate attached property.

System_CAPS_pubfield System_CAPS_static DurationProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static FillBehaviorProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static NameProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static RepeatBehaviorProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static SpeedRatioProperty

Identifies for the  dependency property.

NameDescription
System_CAPS_pubevent Changed

Occurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)

System_CAPS_pubevent Completed

Occurs when this timeline has completely finished playing: it will no longer enter its active period.

System_CAPS_pubevent CurrentGlobalSpeedInvalidated

Occurs when the rate at which time progresses for the timeline's clock changes.

System_CAPS_pubevent CurrentStateInvalidated

Occurs when the property of the timeline's Clock is updated.

System_CAPS_pubevent CurrentTimeInvalidated

Occurs when the property of the timeline's Clock is updated.

System_CAPS_pubevent RemoveRequested

Occurs when the clock created for this timeline or one of its parent timelines is removed.

A timeline represents a segment of time. It provides properties that enable you to specify the length of that segment, when it should start, how many times it will repeat, how fast time progresses in that segment, and more.

Classes that inherit from the timeline class provide additional functionality, such as animation and media playback. The following are examples of some of the different types of specialized timelines available.

For more information about using timelines, see the Animation Overview. For an introduction to the timing features of timelines, see the Timing Behaviors Overview.

Most timeline properties can be data bound or animated; however, because of the way the timing system works, data bound or animated timelines do not behave like other data bound or animated objects. To understand their behavior, it helps to understand what it means to activate a timeline.

When a timeline is applied, copies are made of the timeline and its child timelines. These copies are frozen (made read-only) and Clock objects are created from them. It's these clocks that do the actual work of animating the targeted properties. If a timeline was data bound or animated, a snapshot of its current values was made when its clock was created. Even though the original timeline might continue to change, its clock does not.

For a timeline to reflect data binding or animation changes, its clock must be regenerated. Clocks are not regenerated for you automatically. The following are several ways to apply timeline changes:

  • If the timeline is or belongs to a Storyboard, you can make it reflect changes by reapplying its storyboard using a BeginStoryboard or the Begin method. This has the side effect of also restarting the animation. In code, you can use the Seek method to advance the storyboard back to its previous position.

  • If you applied an animation directly to a property using the BeginAnimation method, call the BeginAnimation method again and pass it the animation that's been modified.

  • If you are working directly at the clock level, create and apply a new set of clocks and use them to replace the previous set of generated clocks.

For an example of a data bound animation, see the Key Spline Animation Sample .

A timeline's clock will only progress when there's an event hander associated with it or (in the case of an AnimationClock object) it is associated with a property. For this reason (and others), it's not recommended that you use a Timeline as a timer.

.NET Framework
Available since 3.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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