BitmapCache BitmapCache BitmapCache BitmapCache Class

定義

建立並快取 UIElement 的點陣圖表示。Creates and caches a bitmap representation of a UIElement.

public ref class BitmapCache sealed : System::Windows::Media::CacheMode
public sealed class BitmapCache : System.Windows.Media.CacheMode
type BitmapCache = class
    inherit CacheMode
Public NotInheritable Class BitmapCache
Inherits CacheMode
繼承

範例

下列 XAML 顯示如何Canvas快取元素。The following XAML shows how to cache a Canvas element. 如需完整的程式碼範例, 請參閱如何:藉由快取元素來改善轉譯效能。For the complete code example, see How to: Improve Rendering Performance by Caching an Element.

<!-- //////////////////////////////////////////////////////////////// -->
<!-- // The following XAML creates a BitmapCache with default      // -->
<!-- // properties and assigns it as the CacheMode for the canvas. // -->
<!-- //////////////////////////////////////////////////////////////// -->
<Canvas.CacheMode>
    <BitmapCache EnableClearType="False" 
                 RenderAtScale="1" 
                 SnapsToDevicePixels="False"  />
</Canvas.CacheMode>

備註

使用類別來改善複雜UIElement的呈現效能。 BitmapCacheUse the BitmapCache class to improve rendering performance of a complex UIElement. 建立, 並將它指派CacheMode給的屬性UIElement , 以將專案及其子樹快取成視訊記憶體中的點陣圖。 BitmapCacheCreate a BitmapCache and assign it to the CacheMode property of a UIElement to cache the element and its subtree as a bitmap in video memory. 當您需要盡可能快速地建立UIElement動畫、轉譯或調整時, 這會很有用。This is useful when you need to animate, translate, or scale a UIElement as quickly as possible. 這種方法可在快取內容時, 在效能和視覺品質之間進行取捨。This approach enables a tradeoff between performance and visual quality while content is cached.

BitmapCacheBrush使用類別有效率地重複使用快取的元素。Use the BitmapCacheBrush class to efficiently reuse a cached element.

RenderAtScale設定屬性以縮放點陣圖快取。Set the RenderAtScale property to scale the bitmap cache. 如果項目會將範圍縮小,而且您想要更清楚地比快取只是所產生的項目磭 鈰郥一樣呈現的項目,這非常有用。This is useful if an element will be zoomed, and you want the element to render more clearly than it would if the cache were simply generated at the element's native resolution.

當快取顯示的內容需要圖元對齊才能正確轉譯時, 請設定屬性,例如ClearType文字。SnapsToDevicePixelsSet the SnapsToDevicePixels property when the cache displays content that requires pixel-alignment to render correctly, such as ClearType text. BitmapCacheBrushViewport2DVisual3D類別會忽略這個屬性。This property is ignored by the BitmapCacheBrush and Viewport2DVisual3D classes.

快取控制項並不會影響滑鼠停留行為, 因此, 滑鼠點擊測試的操作方式就如同點陣圖是即時控制項一樣。Caching a control does not affect mouse-over behavior, so mouse-over hit testing operates as if it the bitmap were a live control.

只有當UIElement或其子樹的結構變更時, 或CacheMode設定變更時, 才會進行快取重新產生。Cache regeneration occurs only when the structure of the UIElement or its subtree changes, or when the CacheMode settings change. RenderAtScale設定或EnableClearType屬性會導致重新產生快取。Setting the RenderAtScale or EnableClearType properties causes cache regeneration. 對快取的父視覺化樹狀結構UIElement所做的變更, 例如轉換、縮放、opacities 和效果, 都不會影響快取。Changes to the parent visual tree of the cached UIElement, such as transforms, scales, opacities, and effects, do not affect the cache.

硬體加速無法使用時的快取功能。The cache functions when hardware acceleration is not available. 在此情況下, 會在軟體中轉譯點陣圖, 而點陣圖維度的最大值為 2048 x 2048。In this case, the bitmap is rendered in software, and the maximum bitmap dimensions are 2048 x 2048.

注意

RenderOptionsTextOptions不會透過快取的元素傳播。RenderOptions and TextOptions do not propagate through a cached element. 您可能必須在快取底下的子項目中, 再次設定這些選項。You may have to set these options again in child elements below the cache.

建構函式

BitmapCache() BitmapCache() BitmapCache() BitmapCache()

初始化 BitmapCache 類別的新執行個體。Initializes a new instance of the BitmapCache class.

BitmapCache(Double) BitmapCache(Double) BitmapCache(Double) BitmapCache(Double)

使用指定的比例,初始化 BitmapCache 類別的新執行個體。Initializes a new instance of the BitmapCache class with the specified scale.

欄位

EnableClearTypeProperty EnableClearTypeProperty EnableClearTypeProperty EnableClearTypeProperty

識別 EnableClearType 相依性屬性。Identifies the EnableClearType dependency property.

RenderAtScaleProperty RenderAtScaleProperty RenderAtScaleProperty RenderAtScaleProperty

識別 RenderAtScale 相依性屬性。Identifies the RenderAtScale dependency property.

SnapsToDevicePixelsProperty SnapsToDevicePixelsProperty SnapsToDevicePixelsProperty SnapsToDevicePixelsProperty

識別 SnapsToDevicePixels 相依性屬性。Identifies the SnapsToDevicePixels dependency property.

屬性

CanFreeze CanFreeze CanFreeze CanFreeze

取得值,指出是否可以將物件設為不可修改。Gets a value that indicates whether the object can be made unmodifiable.

(Inherited from Freezable)
DependencyObjectType DependencyObjectType DependencyObjectType DependencyObjectType

取得包裝此執行個體之 CLRCLR 型別的 DependencyObjectTypeGets the DependencyObjectType that wraps the CLRCLR type of this instance.

(Inherited from DependencyObject)
Dispatcher Dispatcher Dispatcher Dispatcher

取得與這個 Dispatcher 關聯的 DispatcherObjectGets the Dispatcher this DispatcherObject is associated with.

(Inherited from DispatcherObject)
EnableClearType EnableClearType EnableClearType EnableClearType

取得或設定值,這個值表示點陣圖是否為啟動 ClearType 後所呈現。Gets or sets a value that indicates whether the bitmap is rendered with ClearType activated.

HasAnimatedProperties HasAnimatedProperties HasAnimatedProperties HasAnimatedProperties

取得值,這個值表示是否有一個或多個 AnimationClock 物件與這個物件的任何一個相依性屬性相關聯。Gets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties.

(Inherited from Animatable)
IsFrozen IsFrozen IsFrozen IsFrozen

取得值,該值表示物件目前是否可修改。Gets a value that indicates whether the object is currently modifiable.

(Inherited from Freezable)
IsSealed IsSealed IsSealed IsSealed

取得值,這個值表示此執行個體目前是否已密封 (唯讀)。Gets a value that indicates whether this instance is currently sealed (read-only).

(Inherited from DependencyObject)
RenderAtScale RenderAtScale RenderAtScale RenderAtScale

取得或設定值,這個值表示套用至點陣圖的比例。Gets or sets a value that indicates the scale that is applied to the bitmap.

SnapsToDevicePixels SnapsToDevicePixels SnapsToDevicePixels SnapsToDevicePixels

取得或設定值,這個值表示點陣圖是否為使用貼齊像素功能所呈現。Gets or sets a value that indicates whether the bitmap is rendered with pixel snapping.

方法

ApplyAnimationClock(DependencyProperty, AnimationClock) ApplyAnimationClock(DependencyProperty, AnimationClock) ApplyAnimationClock(DependencyProperty, AnimationClock) ApplyAnimationClock(DependencyProperty, AnimationClock)

AnimationClock 套用至指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果屬性已有動畫效果,即使用 SnapshotAndReplace 遞移式行為。If the property is already animated, the SnapshotAndReplace handoff behavior is used.

(Inherited from Animatable)
ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior) ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior) ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior) ApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)

AnimationClock 套用至指定的 DependencyPropertyApplies an AnimationClock to the specified DependencyProperty. 如果已建立屬性的動畫,則會使用指定的 HandoffBehaviorIf the property is already animated, the specified HandoffBehavior is used.

(Inherited from Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline) BeginAnimation(DependencyProperty, AnimationTimeline) BeginAnimation(DependencyProperty, AnimationTimeline) BeginAnimation(DependencyProperty, AnimationTimeline)

將動畫套用至指定的 DependencyPropertyApplies an animation to the specified DependencyProperty. 呈現下一個畫面格後,就會啟動動畫。The animation is started when the next frame is rendered. 如果指定的屬性已有動畫效果,即使用 SnapshotAndReplace 遞移式行為。If the specified property is already animated, the SnapshotAndReplace handoff behavior is used.

(Inherited from Animatable)
BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior) BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior) BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior) BeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)

將動畫套用至指定的 DependencyPropertyApplies an animation to the specified DependencyProperty. 呈現下一個畫面格後,就會啟動動畫。The animation is started when the next frame is rendered. 如果已建立指定之屬性的動畫,則會使用指定的 HandoffBehaviorIf the specified property is already animated, the specified HandoffBehavior is used.

(Inherited from Animatable)
CheckAccess() CheckAccess() CheckAccess() CheckAccess()

判斷呼叫的執行是否可以存取這個 DispatcherObjectDetermines whether the calling thread has access to this DispatcherObject.

(Inherited from DispatcherObject)
ClearValue(DependencyProperty) ClearValue(DependencyProperty) ClearValue(DependencyProperty) ClearValue(DependencyProperty)

清除屬性的區域數值。Clears the local value of a property. 要清除的屬性是由 DependencyProperty 識別項所指定。The property to be cleared is specified by a DependencyProperty identifier.

(Inherited from DependencyObject)
ClearValue(DependencyPropertyKey) ClearValue(DependencyPropertyKey) ClearValue(DependencyPropertyKey) ClearValue(DependencyPropertyKey)

清除唯讀屬性的區域數值。Clears the local value of a read-only property. 要清除的屬性是由 DependencyPropertyKey 所指定。The property to be cleared is specified by a DependencyPropertyKey.

(Inherited from DependencyObject)
Clone() Clone() Clone() Clone()

建立這個 BitmapCache 的可修改複製,製作這個物件值的深層複製。Creates a modifiable clone of the BitmapCache, making deep copies of the object's values. 當複製這個物件的相依性屬性時,這個方法會複製運算式 (但可能已不再解析),但不會複製動畫或其目前值。When copying the object's dependency properties, this method copies expressions (which might no longer resolve) but not animations or their current values.

CloneCore(Freezable) CloneCore(Freezable) CloneCore(Freezable) CloneCore(Freezable)

使用基底 (非動畫) 屬性值,將執行個體設為指定 Freezable 的複製品 (深層複製)。Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values.

(Inherited from Freezable)
CloneCurrentValue() CloneCurrentValue() CloneCurrentValue() CloneCurrentValue()

使用 BitmapCache 的目前值,建立它的可修改複製品 (深層複本)。Creates a modifiable clone (deep copy) of the BitmapCache using its current values.

CloneCurrentValueCore(Freezable) CloneCurrentValueCore(Freezable) CloneCurrentValueCore(Freezable) CloneCurrentValueCore(Freezable)

使用目前的屬性值,讓執行個體成為指定之 Freezable 的可修改複本 (深層複本)。Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values.

(Inherited from Freezable)
CoerceValue(DependencyProperty) CoerceValue(DependencyProperty) CoerceValue(DependencyProperty) CoerceValue(DependencyProperty)

強制轉型所指定相依性屬性的值。Coerces the value of the specified dependency property. 叫用存在於呼叫 CoerceValueCallback 上相依性屬性之屬性中繼資料內所指定的任何 DependencyObject 函式,就可以達到這一點。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)
CreateInstance() CreateInstance() CreateInstance() CreateInstance()

初始化 Freezable 類別的新執行個體。Initializes a new instance of the Freezable class.

(Inherited from Freezable)
CreateInstanceCore() CreateInstanceCore() CreateInstanceCore() CreateInstanceCore()

在衍生類別中實作時,建立 Freezable 衍生類別的新執行個體。When implemented in a derived class, creates a new instance of the Freezable derived class.

(Inherited from Freezable)
Equals(Object) Equals(Object) Equals(Object) Equals(Object)

判斷提供的 DependencyObject 和目前的 DependencyObject 是否相等。Determines whether a provided DependencyObject is equivalent to the current DependencyObject.

(Inherited from DependencyObject)
Freeze() Freeze() Freeze() Freeze()

將目前的物件設為不可修改,並將其 IsFrozen 屬性設定為 trueMakes the current object unmodifiable and sets its IsFrozen property to true.

(Inherited from Freezable)
FreezeCore(Boolean) FreezeCore(Boolean) FreezeCore(Boolean) FreezeCore(Boolean)

將這個 Animatable 物件設定為不可修改,或決定是否可以將它設定為不可修改。Makes this Animatable object unmodifiable or determines whether it can be made unmodifiable.

(Inherited from Animatable)
GetAnimationBaseValue(DependencyProperty) GetAnimationBaseValue(DependencyProperty) GetAnimationBaseValue(DependencyProperty) GetAnimationBaseValue(DependencyProperty)

傳回指定之 DependencyProperty 的非動畫實值。Returns the non-animated value of the specified DependencyProperty.

(Inherited from Animatable)
GetAsFrozen() GetAsFrozen() GetAsFrozen() GetAsFrozen()

使用基底 (非動畫) 屬性值,建立 Freezable 的凍結複本。Creates a frozen copy of the Freezable, using base (non-animated) property values. 因為複本已凍結,所以會以傳址方式複製任何凍結子物件。Because the copy is frozen, any frozen sub-objects are copied by reference.

(Inherited from Freezable)
GetAsFrozenCore(Freezable) GetAsFrozenCore(Freezable) GetAsFrozenCore(Freezable) GetAsFrozenCore(Freezable)

使用基底 (非動畫) 屬性值,將執行個體設為所指定 Freezable 的凍結複製品。Makes the instance a frozen clone of the specified Freezable using base (non-animated) property values.

(Inherited from Freezable)
GetCurrentValueAsFrozen() GetCurrentValueAsFrozen() GetCurrentValueAsFrozen() GetCurrentValueAsFrozen()

使用目前屬性值,建立 Freezable 的凍結複本。Creates a frozen copy of the Freezable using current property values. 因為複本已凍結,所以會以傳址方式複製任何凍結子物件。Because the copy is frozen, any frozen sub-objects are copied by reference.

(Inherited from Freezable)
GetCurrentValueAsFrozenCore(Freezable) GetCurrentValueAsFrozenCore(Freezable) GetCurrentValueAsFrozenCore(Freezable) GetCurrentValueAsFrozenCore(Freezable)

將目前執行個體設為所指定 Freezable 的凍結複製品。Makes the current instance a frozen clone of the specified Freezable. 如果物件具有動畫相依性屬性,則會複製這些屬性的目前動畫值。If the object has animated dependency properties, their current animated values are copied.

(Inherited from Freezable)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

取得這個 DependencyObject 的雜湊程式碼。Gets a hash code for this DependencyObject.

(Inherited from DependencyObject)
GetLocalValueEnumerator() GetLocalValueEnumerator() GetLocalValueEnumerator() GetLocalValueEnumerator()

建立特定的列舉值,以判斷哪些相依性屬性在此 DependencyObject 上具有本機設定的值。Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.

(Inherited from DependencyObject)
GetType() GetType() GetType() GetType()

取得目前執行個體的 TypeGets the Type of the current instance.

(Inherited from Object)
GetValue(DependencyProperty) GetValue(DependencyProperty) GetValue(DependencyProperty) GetValue(DependencyProperty)

傳回 DependencyObject 的這個執行個體上之相依性屬性的目前有效值。Returns the current effective value of a dependency property on this instance of a DependencyObject.

(Inherited from DependencyObject)
InvalidateProperty(DependencyProperty) InvalidateProperty(DependencyProperty) InvalidateProperty(DependencyProperty) InvalidateProperty(DependencyProperty)

重新評估指定之相依性屬性的有效值。Re-evaluates the effective value for the specified dependency property

(Inherited from DependencyObject)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

建立目前 Object 的淺層複本 (Shallow Copy)。Creates a shallow copy of the current Object.

(Inherited from Object)
OnChanged() OnChanged() OnChanged() OnChanged()

目前的 Freezable 物件遭到修改時進行呼叫。Called when the current Freezable object is modified.

(Inherited from Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject) OnFreezablePropertyChanged(DependencyObject, DependencyObject) OnFreezablePropertyChanged(DependencyObject, DependencyObject) OnFreezablePropertyChanged(DependencyObject, DependencyObject)

確定已為剛剛設定的 DependencyObjectType 資料成員,建立適當的內容指標。Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set.

(Inherited from Freezable)
OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty) OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty) OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty) OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)

這個成員支援 Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) 基礎結構,但是您不可以從程式碼直接使用它。This member supports the Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.

(Inherited from Freezable)
OnPropertyChanged(DependencyPropertyChangedEventArgs) OnPropertyChanged(DependencyPropertyChangedEventArgs) OnPropertyChanged(DependencyPropertyChangedEventArgs) OnPropertyChanged(DependencyPropertyChangedEventArgs)

覆寫 OnPropertyChanged(DependencyPropertyChangedEventArgs)DependencyObject 實作也可以叫用任何 Changed 處理常式,以回應類型 Freezable 的變更相依性屬性。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) ReadLocalValue(DependencyProperty) ReadLocalValue(DependencyProperty) ReadLocalValue(DependencyProperty)

傳回相依性屬性的區域值 (如果存在)。Returns the local value of a dependency property, if it exists.

(Inherited from DependencyObject)
ReadPreamble() ReadPreamble() ReadPreamble() ReadPreamble()

確定 Freezable 是從有效的執行緒進行存取。Ensures that the Freezable is being accessed from a valid thread. 如果 API 會讀取非相依性屬性的資料成員,則 Freezable 的繼承者必須在該 API 的開頭呼叫這個方法。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) SetCurrentValue(DependencyProperty, Object) SetCurrentValue(DependencyProperty, Object) SetCurrentValue(DependencyProperty, Object)

設定相依性屬性的值,而不需要變更其值來源。Sets the value of a dependency property without changing its value source.

(Inherited from DependencyObject)
SetValue(DependencyProperty, Object) SetValue(DependencyProperty, Object) SetValue(DependencyProperty, Object) SetValue(DependencyProperty, Object)

設定相依性屬性的區域值 (由相依性屬性的識別碼所指定)。Sets the local value of a dependency property, specified by its dependency property identifier.

(Inherited from DependencyObject)
SetValue(DependencyPropertyKey, Object) SetValue(DependencyPropertyKey, Object) SetValue(DependencyPropertyKey, Object) SetValue(DependencyPropertyKey, Object)

設定唯讀相依性屬性的區域數值 (由相依性屬性的 DependencyPropertyKey 識別項所指定)。Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property.

(Inherited from DependencyObject)
ShouldSerializeProperty(DependencyProperty) ShouldSerializeProperty(DependencyProperty) ShouldSerializeProperty(DependencyProperty) ShouldSerializeProperty(DependencyProperty)

傳回值,這個值表示序列化程序是否應該序列化所提供相依性屬性的值。Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.

(Inherited from DependencyObject)
ToString() ToString() ToString() ToString()

傳回代表目前物件的字串。Returns a string that represents the current object.

(Inherited from Object)
VerifyAccess() VerifyAccess() VerifyAccess() VerifyAccess()

請強制執行可以存取這個 DispatcherObject 的呼叫執行緒。Enforces that the calling thread has access to this DispatcherObject.

(Inherited from DispatcherObject)
WritePostscript() WritePostscript() WritePostscript() WritePostscript()

引發 FreezableChanged 事件,並叫用其 OnChanged() 方法。Raises the Changed event for the Freezable and invokes its OnChanged() method. 在任何 API 修改未以相依性屬性儲存的類別成員之後,衍生自 Freezable 的類別應該在 API 的結尾呼叫這個方法。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.

(Inherited from Freezable)
WritePreamble() WritePreamble() WritePreamble() WritePreamble()

確認 Freezable 未凍結,而且是從有效的執行緒內容進行存取。Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. 在任何 API 將資料寫入至非相依性屬性的資料成員之前,Freezable 繼承者應該在 API 的開頭呼叫這個方法。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)

事件

Changed Changed Changed Changed

發生於 Freezable 或所含的物件遭到修改時。Occurs when the Freezable or an object it contains is modified.

(Inherited from Freezable)

適用於

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