[OpenLayers-Trac] [OpenLayers] #1189: allow triggerEvent to be called with additional arguments for the listener

[OpenLayers]

#1189: allow triggerEvent to be called with additional arguments for the listener
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 Reporter:  tschaub  |       Owner:  euzuro     
     Type:  feature  |      Status:  new        
 Priority:  minor    |   Milestone:  2.6 Release
Component:  Events   |     Version:  2.5        
 Keywords:           |  
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 Our triggerEvent method just calls all listeners (optionally bound to some
 caller).  This can be modified easily to call listeners with additional
 arguments.  This makes event stuff more fun.

 Pretend a drag feature control wanted to trigger a "predragfeature" event
 on a layer.  Listeners should expect to receive the feature in question
 and perhaps the start and end pixel (of the drag).  In addition, if
 triggerEvent returns the return from the last listener, then that control
 can modify its behavior (undo the drag for example) if the arguments
 (start and end pixel in this case) don't meet some user specified
 criteria.

 Just a mocked up example, but this would give us way more flexibility with
 our event magic.  Basically, I'm asking for triggerEvent to take an
 optional third argument and return continueChain.

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Ticket URL: <http://trac.openlayers.org/ticket/1189>
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