org.osmf.elements.DurationElement - ActionScript® 3.0 Reference for the Adobe® Flash® Platform

Package	org.osmf.elements
Class	public class DurationElement
Inheritance	DurationElement ProxyElement MediaElement EventDispatcher Object

Language Version:

ActionScript 3.0

Product Version:

OSMF 1.0

Runtime Versions:

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.

View the examples

Related API Elements

org.osmf.elements.ProxyElement
org.osmf.elements.SerialElement
org.osmf.net.StreamingURLResource

Public Properties

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	Property		Defined By
		constructor : Object A reference to the class object or constructor function for a given object instance.	Object
		container : IMediaContainer [read-only] The media container that this element uses.	MediaElement
		metadataNamespaceURLs : Vector.<String> [read-only] A Vector containing the namespace URLs for all Metadata objects stored within this MediaElement.	MediaElement
		prototype : Object [static] A reference to the prototype object of a class or function object.	Object
		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> [read-only] A Vector of MediaTraitType values representing the trait types on this media element.	MediaElement

Protected Properties

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	Property		Defined By
		blockedTraits : Vector.<String> The set of MediaTraitTypes that this ProxyElement will block.	ProxyElement

Public Methods

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	Method		Defined By
		DurationElement(duration:Number, mediaElement:MediaElement = null) Constructor.	DurationElement
		addEventListener(type:String, listener:Function, useCapture:Boolean = false, priority:int = 0, useWeakReference:Boolean = false):void Registers an event listener object with an EventDispatcher object so that the listener receives notification of an event.	EventDispatcher
		addMetadata(namespaceURL:String, metadata:Metadata):void Adds a Metadata object to this MediaElement under the specified namespace URL.	MediaElement
		dispatchEvent(event:Event):Boolean Dispatches an event into the event flow.	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 Checks whether the EventDispatcher object has any listeners registered for a specific type of event.	EventDispatcher
		hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined.	Object
		hasTrait(type:String):Boolean Determines whether this media element has a media trait of the specified type.	MediaElement
		isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.	Object
		propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable.	Object
		removeEventListener(type:String, listener:Function, useCapture:Boolean = false):void Removes a listener from the EventDispatcher object.	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 Sets the availability of a dynamic property for loop operations.	Object
		toLocaleString():String Returns the string representation of this object, formatted according to locale-specific conventions.	Object
		toString():String Returns the string representation of the specified object.	Object
		valueOf():Object Returns the primitive value of the specified object.	Object
		willTrigger(type:String):Boolean Checks whether an event listener is registered with this EventDispatcher object or any of its ancestors for the specified event type.	EventDispatcher

Protected Methods

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	Method		Defined By
		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

Events

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	Summary	Defined By
activate	[broadcast event] Dispatched when the Flash Player or AIR application gains operating system focus and becomes active.	EventDispatcher
containerChange	Dispatched when the element's container property changed.	MediaElement
deactivate	[broadcast event] Dispatched when the Flash Player or AIR application operating loses system focus and is becoming inactive.	EventDispatcher
mediaError	Dispatched when an error which impacts the operation of the media element occurs.	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

Constructor Detail

DurationElement

()

Constructor

public function DurationElement(duration:Number, mediaElement:MediaElement = null)

Language Version:

ActionScript 3.0

Product Version:

OSMF 1.0

Runtime Versions:

Flash Player 10, AIR 1.5

Constructor.

Parameters

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

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

Examples How to use this example

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