ProxyElement

套件	org.osmf.elements
類別	public class ProxyElement
繼承	ProxyElement MediaElement EventDispatcher Object
子類別	DurationElement, LoadFromDocumentElement

語言版本:

ActionScript 3.0

產品版本:

OSMF 1.0

執行階段版本:

Flash Player 10, AIR 1.5

ProxyElement is a media element that acts as a wrapper for another MediaElement. Its purpose is to control access to the wrapped element.

ProxyElement is not instantiated directly but rather used as the base class for creating wrappers for specific purposes. ProxyElement can be subclassed for any trait type or set of trait types. The subclass controls access to the proxied element either by overriding one or more of the proxied element's traits or by blocking them.

To override any of the proxied element's traits, the subclass creates its own trait instances, which it substitutes for the proxied element's traits that it wishes to override.

To block traits, the subclass prevents the traits of the proxied element from being exposed by setting the ProxyElement's blockedTraits property for the trait types that it wants to block. This causes the proxied element's hasTrait() method to return false and its getTrait() method to return null for the blocked trait types.

A ProxyElement normally dispatches the proxied element's events, unless the trait's type is among those that are blocked by the ProxyElement.

ProxyElement subclasses are useful for modifying the behavior of a MediaElement in a non-invasive way. An example would be adding temporal capabilities to a set of ImageElements to present them in a slide show in which the images are displayed for a specified duration. The ProxyElement subclass would proxy the non-temporal ImageElements and override the proxied element's TimeTrait to return a custom instance of that trait. A similar approach can be applied to other traits, either to provide an alternate implementation of some of the proxied element's underlying traits, to provide an implementation when a needed underlying trait does not exist, or to prevent an underlying trait from being exposed at all.

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
		container : IMediaContainer [唯讀] The media container that this element uses.	MediaElement
		metadataNamespaceURLs : Vector.<String> [唯讀] A Vector containing the namespace URLs for all Metadata objects stored within this MediaElement.	MediaElement
		proxiedElement : MediaElement The MediaElement for which this ProxyElement serves as a proxy, or wrapper.	ProxyElement
		resource : MediaResourceBase The media resource that this media element operates on.	MediaElement
		traitTypes : Vector.<String> [唯讀] A Vector of MediaTraitType values representing the trait types on this media element.	MediaElement

保護屬性

	屬性		定義自
		blockedTraits : Vector.<String> The set of MediaTraitTypes that this ProxyElement will block.	ProxyElement

公用方法

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	方法		定義自
		ProxyElement(proxiedElement:MediaElement = null) Constructor.	ProxyElement
		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
		addMetadata(namespaceURL:String, metadata:Metadata):void Adds a Metadata object to this MediaElement under the specified namespace URL.	MediaElement
		dispatchEvent(event:Event):Boolean 會將事件傳送到事件流程。	EventDispatcher
		getMetadata(namespaceURL:String):Metadata Returns the Metadata object that is stored under this MediaElement with the specified namespace URL.	MediaElement
		getTrait(type:String):org.osmf.traits:MediaTraitBase Returns the media trait of the specified type.	MediaElement
		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
		hasTrait(type:String):Boolean Determines whether this media element has a media trait of the specified type.	MediaElement
		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
		propertyIsEnumerable(name:String):Boolean 指出指定的屬性是否存在，以及是否可列舉。	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void 會從 EventDispatcher 物件移除偵聽程式。	EventDispatcher
		removeMetadata(namespaceURL:String):Metadata Removes the Metadata object that was stored under this MediaElement with the specified namespace URL.	MediaElement
		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

保護方法

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	方法		定義自
		addTrait(type:String, instance:org.osmf.traits:MediaTraitBase):void Adds a new media trait to this media element.	MediaElement
		removeTrait(type:String):org.osmf.traits:MediaTraitBase Removes a media trait from this media element.	MediaElement
		setupTraits():void Sets up the traits for this media element.	MediaElement

事件

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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
containerChange	Dispatched when the element's container property changed.	MediaElement
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
mediaError	Dispatched when an error which impacts the operation of the media element occurs.	MediaElement
mediaInfo	Dispatched when a info which impacts the operation of the media element is available.	MediaElement
metadataAdd	Dispatched when a Metadata object has been added to this media element.	MediaElement
metadataRemove	Dispatched when a Metadata object has been removed from this media element.	MediaElement
traitAdd	Dispatched when a trait is added to the media element.	MediaElement
traitRemove	Dispatched when a trait is removed from the media element.	MediaElement

屬性詳細資訊

blockedTraits

屬性

blockedTraits:Vector.<String>

語言版本:

ActionScript 3.0

產品版本:

OSMF 1.0

執行階段版本:

Flash Player 10, AIR 1.5

The set of MediaTraitTypes that this ProxyElement will block. When a trait is blocked, the ProxyElement will prevent that trait from being exposed when the proxied element contains the trait and the proxy does not. Subclasses can call this to selectively block access to the traits of the proxied element on a per-type basis.

實作
protected function get blockedTraits():Vector.<String>
protected function set blockedTraits(value:Vector.<String>):void

proxiedElement

屬性

proxiedElement:MediaElement

語言版本:

ActionScript 3.0

產品版本:

OSMF 1.0

執行階段版本:

Flash Player 10, AIR 1.5

The MediaElement for which this ProxyElement serves as a proxy, or wrapper.

實作
public function get proxiedElement():MediaElement
public function set proxiedElement(value:MediaElement):void

建構函式詳細資料

()

建構函式

public function ProxyElement(proxiedElement:MediaElement = null)

語言版本:

ActionScript 3.0

產品版本:

OSMF 1.0

執行階段版本:

Flash Player 10, AIR 1.5

Constructor.

參數

proxiedElement:MediaElement (default = null) — MediaElement to proxy. Changes to the proxied element are reflected in the proxy element's properties and events, with the exception of those changes for which an override takes precedence. If the param is null, then it must be set (via the proxiedElement setter) immediately after this constructor call, and before any other methods on this ProxyElement are called, or an IllegalOperationError will be thrown.

法律聲明 | 線上隱私權政策

ProxyElement - AS3 OSMF

類別 x

blockedTraits

proxiedElement

ProxyElement