DurationElement

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

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

DurationElement is a media element that wraps a MediaElement to give it temporal capabilities. It allows a non-temporal MediaElement to be treated as a temporal MediaElement.

The DurationElement class is especially useful for creating delays in the presentation of a media composition. For example, the following code presents a sequence of videos, separated from each other by five-second delays.

     var sequence:SerialElement = new SerialElement();
     
     sequence.addChild(new VideoElement(new URLResource("http://www.example.com/video1.flv")));
     sequence.addChild(new DurationElement(5));
     sequence.addChild(new VideoElement(new URLResource("http://www.example.com/ad.flv")));
     sequence.addChild(new DurationElement(5));
     sequence.addChild(new VideoElement(new URLResource("http://www.example.com/video2.flv")));
     
     // Assign the SerialElement to the MediaPlayer.
     player.media = sequence;

The following example presents a sequence of rotating banners. The delays separating the appearances of the banners are created with DurationElements. In addition, the images themselves are wrapped in DurationElements to enable them to support a duration.

     // The first banner does not appear for five seconds.
     // Each banner is shown for 20 seconds.
     // There is a 15-second delay between images.
     
     var bannerSequence:SerialElement = new SerialElement();
     
     bannerSequence.addChild(new DurationElement(5));
     bannerSequence.addChild(new DurationElement(20,new ImageElement(new URLResource("http://www.example.com/banner1.jpg")));
     bannerSequence.addChild(new DurationElement(15));
     bannerSequence.addChild(new DurationElement(20,new ImageElement(new URLResource("http://www.example.com/banner2.jpg")));
     bannerSequence.addChild(new DurationElement(15));
     bannerSequence.addChild(new DurationElement(20,new ImageElement(new URLResource("http://www.example.com/banner3.jpg")));

The DurationElement will not work with elements that already have a TimeTrait, such as VideoElement. To specify a start and end time for a VideoElement. use StreamingURLResource's clipStartTime and clipEndTime properties.

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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

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	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
		DurationElement(duration:Number, mediaElement:MediaElement = null) Constructor.	DurationElement
		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

建構函式詳細資料

()

建構函式

public function DurationElement(duration:Number, mediaElement: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

	`duration:Number` — Duration of the DurationElement's TimeTrait, in seconds.

	`mediaElement:MediaElement` (default = `null`) — Optional element to be wrapped by this DurationElement.

範例如何使用本範例

DurationElementExample.as

package
{
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    
    import org.osmf.elements.BeaconElement;
    import org.osmf.elements.DurationElement;
    import org.osmf.elements.ImageElement;
    import org.osmf.elements.VideoElement;
    import org.osmf.media.MediaPlayer;
    import org.osmf.media.MediaPlayerSprite;
    import org.osmf.media.URLResource;
    
    public class DurationElementExample extends Sprite
    {
        public function DurationElementExample()
        {                
            super();
            
            stage.scaleMode = StageScaleMode.NO_SCALE;
            stage.align = StageAlign.TOP_LEFT;
            
            var mediaPlayerSprite:MediaPlayerSprite = new MediaPlayerSprite();
            var imageElement:ImageElement = new ImageElement();
            imageElement.resource = new URLResource("http://mediapm.edgesuite.net/strobe/content/test/train.jpg");
            
            // Shows the image for 10 seconds.
            var durationElement:DurationElement = new DurationElement(10, imageElement);
            
            addChild(mediaPlayerSprite);
            mediaPlayerSprite.media = durationElement;    
        }
    }
}

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DurationElement - AS3 OSMF

類別 x

DurationElement