Timeline 类

定义

定义一个时间段。Defines a segment of time.

public ref class Timeline abstract : System::Windows::Media::Animation::Animatable
[System.Windows.Localizability(System.Windows.LocalizationCategory.None, Readability=System.Windows.Readability.Unreadable)]
[System.Windows.Markup.RuntimeNameProperty("Name")]
public abstract class Timeline : System.Windows.Media.Animation.Animatable
type Timeline = class
    inherit Animatable
Public MustInherit Class Timeline
Inherits Animatable
继承
派生
属性

注解

时间线表示时间段。A timeline represents a segment of time. 它提供的属性让你可以指定该时间段的长度、开始时间、重复次数、该时间段内时间进度的快慢等。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.

从时间线类继承的类可提供附加功能,例如动画和媒体播放。Classes that inherit from the timeline class provide additional functionality, such as animation and media playback. 下面是一些可用的不同类型的专用时间线的示例。The following are examples of some of the different types of specialized timelines available.

有关使用时间线的详细信息, 请参阅动画概述For more information about using timelines, see the Animation Overview. 有关时间线的计时功能的简介, 请参阅计时行为概述For an introduction to the timing features of timelines, see the Timing Behaviors Overview.

数据绑定和动画处理时间线Data Binding and Animating Timelines

大多数时间线属性可以是数据绑定的或动态的;但是, 由于计时系统的工作方式, 数据绑定或动画时间线的行为与其他数据绑定或动画对象的行为不同。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. 若要了解其行为, 有助于理解激活时间线的方式。To understand their behavior, it helps to understand what it means to activate a timeline.

应用时间线时, 将生成时间线及其子时间线的副本。When a timeline is applied, copies are made of the timeline and its child timelines. 这些副本会被冻结 (变为只读), 并Clock从它们创建对象。These copies are frozen (made read-only) and Clock objects are created from them. 这就是对目标属性进行动画处理的实际工作所用的时钟。It's these clocks that do the actual work of animating the targeted properties. 如果时间线是数据绑定的或动态的, 则在创建其时钟时, 将生成其当前值的快照。If a timeline was data bound or animated, a snapshot of its current values was made when its clock was created. 即使原始时间线可能会继续更改, 时钟也不会更改。Even though the original timeline might continue to change, its clock does not.

要使时间线反映数据绑定或动画更改, 必须重新生成时钟。For a timeline to reflect data binding or animation changes, its clock must be regenerated. 时钟不会自动重新生成。Clocks are not regenerated for you automatically. 以下是应用时间线更改的几种方法:The following are several ways to apply timeline changes:

  • 如果时间线是或属于Storyboard, 则可以通过BeginStoryboard使用或Begin方法重新应用它的情节提要, 使其反映更改。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. 这还会产生重新启动动画的附带影响。This has the side effect of also restarting the animation. 在代码中, 可以使用Seek方法将演示图板前进到其之前的位置。In code, you can use the Seek method to advance the storyboard back to its previous position.

  • 如果使用BeginAnimation方法将动画直接应用到属性, 请再次BeginAnimation调用方法并向其传递已修改的动画。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.

  • 如果要直接在时钟级别上工作,请创建并应用一组新的时钟,然后用它们替换之前生成的一组时钟。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.

有关数据绑定动画的示例, 请参阅主曲线动画示例For an example of a data bound animation, see the Key Spline Animation Sample .

使用时间线作为计时器Using a Timeline as a Timer

仅当存在与其相关联的事件处理程序时, 或 (在AnimationClock对象的情况下) 与属性相关联的事件处理程序时, 时间线的时钟才会进行。A timeline's clock will only progress when there's an event handler associated with it or (in the case of an AnimationClock object) it is associated with a property. 出于此原因 (以及其他), 不建议使用Timeline作为计时器。For this reason (and others), it's not recommended that you use a Timeline as a timer.

构造函数

Timeline()

初始化 Timeline 类的新实例。Initializes a new instance of the Timeline class.

Timeline(Nullable<TimeSpan>)

使用指定的 Timeline 初始化 BeginTime 类的新实例。Initializes a new instance of the Timeline class with the specified BeginTime.

Timeline(Nullable<TimeSpan>, Duration)

使用指定的 TimelineBeginTime 初始化 Duration 类的新实例。Initializes a new instance of the Timeline class with the specified BeginTime and Duration.

Timeline(Nullable<TimeSpan>, Duration, RepeatBehavior)

使用指定的 TimelineBeginTimeDuration 初始化 RepeatBehavior 类的新实例。Initializes a new instance of the Timeline class with the specified BeginTime, Duration, and RepeatBehavior.

字段

AccelerationRatioProperty

标识 AccelerationRatio 依赖项属性。Identifies the AccelerationRatio dependency property.

AutoReverseProperty

标识 AutoReverse 依赖项属性。Identifies the AutoReverse dependency property.

BeginTimeProperty

标识 BeginTime 依赖项属性。Identifies the BeginTime dependency property.

DecelerationRatioProperty

标识 DecelerationRatio 依赖属性。Identifies for the DecelerationRatio dependency property.

DesiredFrameRateProperty

标识 DesiredFrameRate 附加属性。Identifies the DesiredFrameRate attached property.

DurationProperty

标识 Duration 依赖项属性。Identifies the Duration dependency property.

FillBehaviorProperty

标识 FillBehavior 依赖项属性。Identifies the FillBehavior dependency property.

NameProperty

标识 Name 依赖项属性。Identifies the Name dependency property.

RepeatBehaviorProperty

标识 RepeatBehavior 依赖项属性。Identifies the RepeatBehavior dependency property.

SpeedRatioProperty

标识 SpeedRatio 依赖属性。Identifies for the SpeedRatio dependency property.

属性

AccelerationRatio

获取或设置一个值,该值指定在将时间消逝从零加速到其最大速率过程中所占用时间线的 Duration 的百分比。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.

AutoReverse

获取或设置一个值,该值指示时间线在完成向前迭代后是否按相反的顺序播放。Gets or sets a value that indicates whether the timeline plays in reverse after it completes a forward iteration.

BeginTime

获取或设置此 Timeline 应开始的时间。Gets or sets the time at which this Timeline should begin.

CanFreeze

获取一个值,该值指示是否可将对象变为不可修改。Gets a value that indicates whether the object can be made unmodifiable.

(继承自 Freezable)
DecelerationRatio

获取或设置一个值,该值指定在将时间消逝从其最大速率减速到零的过程中所占用时间线的 Duration 的百分比。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.

DependencyObjectType

获取对此实例的 CLRCLR 类型进行包装的 DependencyObjectTypeGets the DependencyObjectType that wraps the CLRCLR type of this instance.

(继承自 DependencyObject)
Dispatcher

获取与此 Dispatcher 关联的 DispatcherObjectGets the Dispatcher this DispatcherObject is associated with.

(继承自 DispatcherObject)
Duration

获取或设置此时间线播放的时间长度,而不是计数重复。Gets or sets the length of time for which this timeline plays, not counting repetitions.

FillBehavior

获取或设置一个值,该值指定 Timeline 在活动周期结束后的行为方式。Gets or sets a value that specifies how the Timeline behaves after it reaches the end of its active period.

HasAnimatedProperties

获取一个值,该值指示一个或多个 AnimationClock 对象是否与此对象的任何依赖项属性相关联。Gets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties.

(继承自 Animatable)
IsFrozen

获取一个值,该值指示对象当前是否可修改。Gets a value that indicates whether the object is currently modifiable.

(继承自 Freezable)
IsSealed

获取一个值,该值指示此实例当前是否为密封的(只读)。Gets a value that indicates whether this instance is currently sealed (read-only).

(继承自 DependencyObject)
Name

获取或设置此 Timeline 的名称。Gets or sets the name of this Timeline.

RepeatBehavior

获取或设置此时间线的重复行为。Gets or sets the repeating behavior of this timeline.

SpeedRatio

获取或设置此 Timeline 的时间相对于其父级的前进速率。Gets or sets the rate, relative to its parent, at which time progresses for this Timeline.

附加属性

DesiredFrameRate

获取或设置此时间线及其子时间线所需的帧速率。Gets or sets the desired frame rate for this timeline and its child timelines.

方法

AllocateClock()

为此 Clock 创建一个 TimelineCreates a Clock for this Timeline.

ApplyAnimationClock(DependencyProperty, AnimationClock)

AnimationClock 应用到指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果该属性已进行动画处理,则使用 SnapshotAndReplace 切换行为。If the property is already animated, the SnapshotAndReplace handoff behavior is used.

(继承自 Animatable)
ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)

AnimationClock 应用到指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果该属性已进行动画处理,则使用指定的 HandoffBehaviorIf the property is already animated, the specified HandoffBehavior is used.

(继承自 Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline)

将动画应用于指定 DependencyPropertyApplies an animation to the specified DependencyProperty. 动画会在呈现下一帧时启动。The animation is started when the next frame is rendered. 如果指定属性已进行动画处理,则使用 SnapshotAndReplace 切换行为。If the specified property is already animated, the SnapshotAndReplace handoff behavior is used.

(继承自 Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)

将动画应用于指定 DependencyPropertyApplies an animation to the specified DependencyProperty. 动画会在呈现下一帧时启动。The animation is started when the next frame is rendered. 如果指定的属性已进行动画处理,则使用指定的 HandoffBehaviorIf the specified property is already animated, the specified HandoffBehavior is used.

(继承自 Animatable)
CheckAccess()

确定调用线程是否可以访问此 DispatcherObjectDetermines whether the calling thread has access to this DispatcherObject.

(继承自 DispatcherObject)
ClearValue(DependencyProperty)

清除属性的本地值。Clears the local value of a property. 要清除的属性由 DependencyProperty 标识符指定。The property to be cleared is specified by a DependencyProperty identifier.

(继承自 DependencyObject)
ClearValue(DependencyPropertyKey)

清除只读属性的本地值。Clears the local value of a read-only property. 要清除的属性由 DependencyPropertyKey 指定。The property to be cleared is specified by a DependencyPropertyKey.

(继承自 DependencyObject)
Clone()

创建此 Timeline 的可修改克隆,从而深度复制此对象的值。Creates a modifiable clone of this Timeline, making deep copies of this object's values.

CloneCore(Freezable)

使用基(未经过动画处理的)属性值使该实例成为指定 Freezable 的克隆(深层复制)。Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values.

(继承自 Freezable)
CloneCurrentValue()

创建此 Timeline 对象的可修改复本,从而深度复制此对象的当前值。Creates a modifiable clone of this Timeline object, making deep copies of this object's current values.

CloneCurrentValueCore(Freezable)

使用当前属性值使该实例成为指定 Freezable 的可修改克隆(深层复制)。Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values.

(继承自 Freezable)
CoerceValue(DependencyProperty)

对指定依赖属性的值进行强制。Coerces the value of the specified dependency property. 通过对调用方 DependencyObject 上存在的依赖属性的属性元数据中所指定的任何 CoerceValueCallback 函数进行调用来完成此操作。This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.

(继承自 DependencyObject)
CreateClock()

从此 Timeline 创建一个可以控制的新 ClockCreates a new, controllable Clock from this Timeline. 如果此 Timeline 含有子级,则创建时钟树时将此 Timeline 作为根。If this Timeline has children, a tree of clocks is created with this Timeline as the root.

CreateClock(Boolean)

从此 Clock 创建一个新的 Timeline 并指定新的 Clock 是否可以控制。Creates a new Clock from this Timeline and specifies whether the new Clock is controllable. 如果此 Timeline 含有子级,则创建时钟树时将此 Timeline 作为根。If this Timeline has children, a tree of clocks is created with this Timeline as the root.

CreateInstance()

初始化 Freezable 类的新实例。Initializes a new instance of the Freezable class.

(继承自 Freezable)
CreateInstanceCore()

在派生类中实现时,创建 Freezable 派生类的新实例。When implemented in a derived class, creates a new instance of the Freezable derived class.

(继承自 Freezable)
Equals(Object)

确定提供的 DependencyObject 是否等效于当前 DependencyObjectDetermines whether a provided DependencyObject is equivalent to the current DependencyObject.

(继承自 DependencyObject)
Freeze()

使当前对象不可修改,并且将其 IsFrozen 属性设置为 trueMakes the current object unmodifiable and sets its IsFrozen property to true.

(继承自 Freezable)
FreezeCore(Boolean)

使此 Timeline 成为不可修改的,或确定是否可使其成为不可修改的。Makes this Timeline unmodifiable or determines whether it can be made unmodifiable.

GetAnimationBaseValue(DependencyProperty)

返回指定的 DependencyProperty 的未经过动画处理的值。Returns the non-animated value of the specified DependencyProperty.

(继承自 Animatable)
GetAsFrozen()

使用基(未经过动画处理的)属性值创建 Freezable 的冻结副本。Creates a frozen copy of the Freezable, using base (non-animated) property values. 由于副本已冻结,因此将通过引用复制任何冻结的子对象。Because the copy is frozen, any frozen sub-objects are copied by reference.

(继承自 Freezable)
GetAsFrozenCore(Freezable)

使此实例成为指定 Timeline 对象的副本。Makes this instance a clone of the specified Timeline object.

GetCurrentValueAsFrozen()

使用当前属性值创建 Freezable 的冻结副本。Creates a frozen copy of the Freezable using current property values. 由于副本已冻结,因此将通过引用复制任何冻结的子对象。Because the copy is frozen, any frozen sub-objects are copied by reference.

(继承自 Freezable)
GetCurrentValueAsFrozenCore(Freezable)

使此实例成为指定 Timeline 的冻结复本。Makes this instance a frozen clone of the specified Timeline. 不复制资源引用、数据绑定和动画,而是复制其当前值。Resource references, data bindings, and animations are not copied, but their current values are.

GetDesiredFrameRate(Timeline)

获取指定 Timeline 所需的帧速率。Gets the desired frame rate of the specified Timeline.

GetHashCode()

获取此 DependencyObject 的哈希代码。Gets a hash code for this DependencyObject.

(继承自 DependencyObject)
GetLocalValueEnumerator()

创建一个专用的枚举数,用于确定哪些依赖项属性在此 DependencyObject 上具有以本地方式设置的值。Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.

(继承自 DependencyObject)
GetNaturalDuration(Clock)

返回此 Timeline 单次迭代的长度。Returns the length of a single iteration of this Timeline.

GetNaturalDurationCore(Clock)

返回此 Timeline 单次迭代的长度。Returns the length of a single iteration of this Timeline. 此方法提供 GetNaturalDuration(Clock) 的实现。This method provides the implementation for GetNaturalDuration(Clock).

GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
GetValue(DependencyProperty)

DependencyObject 的此实例返回依赖属性的当前有效值。Returns the current effective value of a dependency property on this instance of a DependencyObject.

(继承自 DependencyObject)
InvalidateProperty(DependencyProperty)

重新评估指定依赖属性的有效值。Re-evaluates the effective value for the specified dependency property.

(继承自 DependencyObject)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
OnChanged()

修改当前 Freezable 对象时调用。Called when the current Freezable object is modified.

(继承自 Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject)

确保为刚刚设置的 DependencyObjectType 数据成员建立适当的上下文指针。Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set.

(继承自 Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)

此成员支持 Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) 基础结构,但不能在代码中直接使用。This member supports the Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.

(继承自 Freezable)
OnPropertyChanged(DependencyPropertyChangedEventArgs)

重写 OnPropertyChanged(DependencyPropertyChangedEventArgs)DependencyObject 实现,以同时调用任何响应类型 Freezable 不断变化的依赖属性的 Changed 处理程序。Overrides the DependencyObject implementation of OnPropertyChanged(DependencyPropertyChangedEventArgs) to also invoke any Changed handlers in response to a changing dependency property of type Freezable.

(继承自 Freezable)
ReadLocalValue(DependencyProperty)

如果存在,则返回依赖属性的本地值。Returns the local value of a dependency property, if it exists.

(继承自 DependencyObject)
ReadPreamble()

确保正在从有效的线程访问 FreezableEnsures that the Freezable is being accessed from a valid thread. Freezable 的继承者必须在任何 API 一开始读取不属于依赖项对象的数据成员时调用此方法。Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties.

(继承自 Freezable)
SetCurrentValue(DependencyProperty, Object)

设置依赖属性的值而不更改其值源。Sets the value of a dependency property without changing its value source.

(继承自 DependencyObject)
SetDesiredFrameRate(Timeline, Nullable<Int32>)

设置指定 Timeline 所需的帧速率。Sets the desired frame rate of the specified Timeline.

SetValue(DependencyProperty, Object)

设置依赖属性的本地值,该值由其依赖属性标识符指定。Sets the local value of a dependency property, specified by its dependency property identifier.

(继承自 DependencyObject)
SetValue(DependencyPropertyKey, Object)

设置一个只读依赖属性的本地值,该值由依赖属性的 DependencyPropertyKey 标识符指定。Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property.

(继承自 DependencyObject)
ShouldSerializeProperty(DependencyProperty)

返回一个值,该值指示序列化进程是否应序列化所提供的依赖属性的值。Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.

(继承自 DependencyObject)
ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(继承自 Object)
VerifyAccess()

强制调用线程具有此 DispatcherObject 的访问权限。Enforces that the calling thread has access to this DispatcherObject.

(继承自 DispatcherObject)
WritePostscript()

引发 FreezableChanged 事件并调用其 OnChanged() 方法。Raises the Changed event for the Freezable and invokes its OnChanged() method. Freezable 派生的类应在修改的类成员不存储为依赖属性的任何 API 的末尾调用此方法。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.

(继承自 Freezable)
WritePreamble()

验证 Freezable 是否未被冻结,并且是否正在从有效的线程上下文中访问它。Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable 的继承项应当在任何 API 一开始写入不属于依赖项属性的数据成员时调用此方法。Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties.

(继承自 Freezable)

事件

Changed

在修改 Freezable 或其包含的对象时发生。Occurs when the Freezable or an object it contains is modified.

(继承自 Freezable)
Completed

当此时间线完全播放完毕时发生:它将不再进入其活动周期。Occurs when this timeline has completely finished playing: it will no longer enter its active period.

CurrentGlobalSpeedInvalidated

在时间线时钟的时间前进速率发生变化时发生。Occurs when the rate at which time progresses for the timeline's clock changes.

CurrentStateInvalidated

更新时间线的 ClockCurrentState 属性时发生。Occurs when the CurrentState property of the timeline's Clock is updated.

CurrentTimeInvalidated

更新时间线的 ClockCurrentTime 属性时发生。Occurs when the CurrentTime property of the timeline's Clock is updated.

RemoveRequested

当移除为此时间线创建的时钟或其中一个父时间线时发生。Occurs when the clock created for this timeline or one of its parent timelines is removed.

适用于

另请参阅