AS3 - How can I dispacth an Event.CHANGE from an Array/Vector?

I would like to su开发者_如何学Cbclass an Array or Vector to dispatch and Event.CHANGE when any elements value changes.

How would I go about doing this?

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How about using an ArrayCollection and listen to the CollectionEvent (mx.events.CollectionEvent.COLLECTION_CHANGE)

    /**
     *  Dispatched when the ICollectionView has been updated in some way.
     *
     *  @eventType mx.events.CollectionEvent.COLLECTION_CHANGE
     *  
     *  @langversion 3.0
     *  @playerversion Flash 9
     *  @playerversion AIR 1.1
     *  @productversion Flex 3
     */
    [Event(name="collectionChange", type="mx.events.CollectionEvent")]

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There is two ways of approaching it, if you want to create your own collection: 1) Extend Array class, and use method like updata(index:int, value:*) to update data in it instead of array accessors (myArray[i] = newValue). And in update method you can dispatch change event. This might make your code less concise.

2) Extend Proxy and override setProperty and getProperty methods in flash_proxy namespace. This will allow you to use array access operators ([key]), downside is – Proxy is slow.

There is number of ready open source collections based on proxy out there.