[OpenLayers-Trac] [OpenLayers] #3095: Create a Layer::moveByPx method

[OpenLayers]

#3095: Create a Layer::moveByPx method
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 Reporter:  ahocevar  |       Owner:  euzuro      
     Type:  task      |      Status:  new         
 Priority:  minor     |   Milestone:  2.11 Release
Component:  Layer     |     Version:  2.10        
 Keywords:  mobile    |       State:              
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 After #3062, there are two ways to move to a new position: either by using
 Map::moveTo (which calls Layer::moveTo on every layer), or by using
 Map::moveByPx, which only fires the "move" event on all layers.

 I'd suggest we create a Layer::moveByPx method, so layers can take the
 appropriate actions. This method could be called by Map::moveByPx while
 looping through the layers to trigger the "move" event on them.

 Later, we can consider a more event based approach (e.g. layers listening
 to the map's "move" event), in case we decide that doing so does not have
 a performance impact.

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Ticket URL: <http://trac.openlayers.org/ticket/3095>
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