CODEWITHSUNDEEP
apache-flexactionscript-3eventsflex4
krishma sood
krishma sood

Reputation: 59

Flex Events flow in non hierarchy e.g via framework responder

say an application has panel and panel has button and textField or textArea. we click on a button to hit a service say via cairngorm framework.

The Events lifecycle follows the capture-target-bubble cycle in the display hierarchy like the MouseClick event on button will call the handlers for the listeners attached to button and/or panel and/or application and/or stage since the flow moves in this direction.

How do the event on non hierarchy works e.g the result from the service fires a custom event DataRecieved. we have a listener attached to the panel/button for this dataRecieved event. How do this listener gets the information? how the event lifecycle comes into this picture?

Can anyone explain this?

Thanks!

Upvotes: 0

Views: 269

Answers (3)

krishma sood
krishma sood

Reputation: 59

I found out the concept of GlobalEventDispatcher to which we can attach listeners and dispatch from the same.

a ref from another question was helpful - Flex Custom Event dispatching The important point is that - the instance of dispatcher must be same. we can keep a Custom Global singleton event dispatcher for our application or we can use stage/systemManager/FexGlobals.toplevelapplicaton for the purpose which might not be a good Practice.

Upvotes: 0

Jan
Jan

Reputation: 1000

If you dispatch a custom event on a Flex UIComponent via dispatchEvent, the UIComponent takes care of bubbling the event through the display hierarchy, as long as the bubbles flag in the Event object is true.

Upvotes: 0

merv
merv

Reputation: 76750

Since it's a non-DisplayObject, the Event only has a target phase. That means that only listeners attached to the Object which is identical to the Object in the target property of the Event work. Hence, non-DisplayObject's can only dispatch Events to themselves. At least that's how I understand it.

In answer to a related question there is some discussion of writing custom EventDispatcher's that would enable a bubbling for non-DisplayObject's.

Upvotes: 1

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