ContentCache

套件	spark.core
類別	public class ContentCache
繼承	ContentCache EventDispatcher Object
實作	IContentLoader

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Provides a caching and queuing image content loader suitable for using a shared image cache for the BitmapImage and spark Image components.

公用屬性

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	屬性		定義自
		constructor : Object 類別物件的參照或是特定物件實體的建構函數。	Object
		enableCaching : Boolean Enables caching behavior and functionality.	ContentCache
		enableQueueing : Boolean Enables queuing behavior and functionality.	ContentCache
		maxActiveRequests : int Maximum simultaneous active requests when queuing is enabled.	ContentCache
		maxCacheEntries : int Maximum size of MRU based cache.	ContentCache
		numCacheEntries : int [唯讀] Count of active/in-use cache entries.	ContentCache

保護屬性

	屬性		定義自
		activeRequests : LinkedList List of queued CacheEntryNode instances currently executing.	ContentCache
		cachedData : Dictionary Map of source to CacheEntryNode.	ContentCache
		cacheEntries : LinkedList Ordered (MRU) list of CacheEntryNode instances.	ContentCache
		priorityGroup : String = "_DEFAULT_" Identifier of the currently prioritized content grouping.	ContentCache
		requestQueue : LinkedList List of queued CacheEntryNode instances.	ContentCache

公用方法

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	方法		定義自
		ContentCache() Constructor.	ContentCache
		addCacheEntry(source:Object, value:Object):void Adds new entry to cache (or replaces existing entry).	ContentCache
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void 會在 EventDispatcher 物件註冊事件偵聽程式，以便讓偵聽程式收到事件的通知。	EventDispatcher
		dispatchEvent(event:Event):Boolean 會將事件傳送到事件流程。	EventDispatcher
		getCacheEntry(source:Object):Object Obtain an entry for the given key if one exists.	ContentCache
		hasEventListener(type:String):Boolean 會檢查 EventDispatcher 物件是否有對特定的事件類型註冊偵聽程式。	EventDispatcher
		hasOwnProperty(name:String):Boolean 指出物件是否有已定義的指定屬性。	Object
		isPrototypeOf(theClass:Object):Boolean 指出 Object 類別的實體是否位於指定為參數的物件原型鏈中。	Object
		load(source:Object, contentLoaderGrouping:String = null):ContentRequest Initiates a content request for the resource identified by the key specified.	ContentCache
		prioritize(contentLoaderGrouping:String):void Promotes a content grouping to the head of the loading queue.	ContentCache
		propertyIsEnumerable(name:String):Boolean 指出指定的屬性是否存在，以及是否可列舉。	Object
		removeAllCacheEntries():void Resets our cache content to initial empty state.	ContentCache
		removeAllQueueEntries():void Resets the queue to initial empty state.	ContentCache
		removeCacheEntry(source:Object):void Remove specific entry from cache.	ContentCache
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void 會從 EventDispatcher 物件移除偵聽程式。	EventDispatcher
		setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void 為迴圈作業設定動態屬性的可用性。	Object
		toLocaleString():String 傳回代表此物件的字串，根據地區特定慣例進行格式化。	Object
		toString():String 會傳回指定之物件的字串形式。	Object
		valueOf():Object 會傳回指定之物件的基本值。	Object
		willTrigger(type:String):Boolean 檢查此 EventDispatcher 物件是否已註冊事件偵聽程式，或者此物件的任何祖系已為特定事件類型註冊事件偵聽程式。	EventDispatcher

事件

按一下以瞭解事件的詳細資訊

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	摘要	定義自
activate	[廣播事件] 當 Flash Player 或 AIR 應用程式取得作業系統焦點並成為作用中時傳送。	EventDispatcher
deactivate	[廣播事件] 當 Flash Player 或 AIR 應用程式失去作業系統焦點並成為非作用中時傳送。	EventDispatcher
invalidateLoader	Dispatched when a cache entry is invalidated, generally this occurs when the entry is determined to be untrusted while one or more outstanding load requests are active for a given cache entry.	ContentCache

保護常數

	常數		定義自
		UNTRUSTED : String = "untrusted" [靜態] Value used to mark cached URLs that are detected as being from an untrusted source (meaning they will no longer be shareable).	ContentCache

屬性詳細資訊

activeRequests

屬性

protected var activeRequests:LinkedList

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

List of queued CacheEntryNode instances currently executing.

cachedData

屬性

protected var cachedData:Dictionary

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Map of source to CacheEntryNode.

cacheEntries

屬性

protected var cacheEntries:LinkedList

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Ordered (MRU) list of CacheEntryNode instances.

enableCaching

屬性

enableCaching:Boolean

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Enables caching behavior and functionality. Applies only to new load() requests.

預設值為 true。

實作
public function get enableCaching():Boolean
public function set enableCaching(value:Boolean):void

enableQueueing

屬性

enableQueueing:Boolean

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Enables queuing behavior and functionality. Applies only to new load() requests.

預設值為 false。

實作
public function get enableQueueing():Boolean
public function set enableQueueing(value:Boolean):void

maxActiveRequests

屬性

maxActiveRequests:int

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Maximum simultaneous active requests when queuing is enabled.

預設值為 2。

實作
public function get maxActiveRequests():int
public function set maxActiveRequests(value:int):void

maxCacheEntries

屬性

maxCacheEntries:int

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Maximum size of MRU based cache. When numCacheEntries exceeds maxCacheEntries the least recently used are pruned to fit.

預設值為 100。

實作
public function get maxCacheEntries():int
public function set maxCacheEntries(value:int):void

numCacheEntries

屬性

numCacheEntries:int [唯讀]

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Count of active/in-use cache entries.

實作
public function get numCacheEntries():int

priorityGroup

屬性

protected var priorityGroup:String = "_DEFAULT_"

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Identifier of the currently prioritized content grouping.

預設值為 "_DEFAULT_"。

requestQueue

屬性

protected var requestQueue:LinkedList

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

List of queued CacheEntryNode instances.

建構函式詳細資料

()

建構函式

public function ContentCache()

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Constructor.

方法詳細資訊

addCacheEntry

()

方法

public function addCacheEntry(source:Object, value:Object):void

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Adds new entry to cache (or replaces existing entry).

參數

	`source:Object` — Unique key to associate provided value with in cache.

	`value:Object` — Value to cache for given key.

getCacheEntry

()

方法

public function getCacheEntry(source:Object):Object

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Obtain an entry for the given key if one exists.

參數

source:Object — Unique key used to represent the requested content resource.

傳回值

Object — A value being stored by the cache for the provided key. Returns null if not found or in the likely case the value was stored as null.

load

()

方法

public function load(source:Object, contentLoaderGrouping:String = null):ContentRequest

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 2.5

Initiates a content request for the resource identified by the key specified.

參數

	`source:Object` — Unique key used to represent the requested content resource. This parameter is typically an URL or URLRequest.

	`contentLoaderGrouping:String` (default = `null`) — - (Optional) grouping identifier for the loaded resource. ContentLoader instances supporting content groups generally allow for resources within the same named grouping to be addressed as a whole. For example the ContentCache's loader queue allows requests to be prioritized by contentLoaderGrouping.

傳回值

ContentRequest — A ContentRequest instance representing the requested resource.

prioritize

()

方法

public function prioritize(contentLoaderGrouping:String):void

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Promotes a content grouping to the head of the loading queue.

參數

contentLoaderGrouping:String — Name of content grouping to promote in the loading queue. All queued requests with matching contentLoaderGroup will be shifted to the head of the queue.

removeAllCacheEntries

()

方法

public function removeAllCacheEntries():void

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Resets our cache content to initial empty state.

removeAllQueueEntries

()

方法

public function removeAllQueueEntries():void

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Resets the queue to initial empty state. All requests, both active and queued, are cancelled. All cache entries associated with canceled requests are invalidated.

removeCacheEntry

()

方法

public function removeCacheEntry(source:Object):void

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 1.5

Remove specific entry from cache.

參數

source:Object — Unique key for value to remove from cache.

事件詳細資訊

invalidateLoader

事件

事件物件類型: spark.events.LoaderInvalidationEvent
屬性 LoaderInvalidationEvent.type = spark.events.LoaderInvalidationEvent

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 10, AIR 2.0

Dispatched when a cache entry is invalidated, generally this occurs when the entry is determined to be untrusted while one or more outstanding load requests are active for a given cache entry. This mechanism allows any outstanding content requests to be reset due to the fact that the cache entry has been deemed 'unshareable'. Each content request notified then attempts instead re-requests the asset.

常數詳細資訊

UNTRUSTED

常數

protected static const UNTRUSTED:String = "untrusted"

語言版本:

ActionScript 3.0

產品版本:

Flex 4.5

執行階段版本:

Flash Player 9, AIR 1.1

Value used to mark cached URLs that are detected as being from an untrusted source (meaning they will no longer be shareable).

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ContentCache - AS3 Flex

套件x

語言元素

附錄

套件 spark.core

activeRequests

cachedData

cacheEntries

enableCaching

enableQueueing

maxActiveRequests

maxCacheEntries

numCacheEntries

priorityGroup

requestQueue

ContentCache

addCacheEntry

getCacheEntry

load

prioritize

removeAllCacheEntries

removeAllQueueEntries

removeCacheEntry

invalidateLoader

UNTRUSTED