[OpenLayers-Users] what part of the API handles mouse drag panning?

[Tim Schaub]

Hello-

Leandro R wrote:
> Is there any way, such as a program, to know or determinate which 
> control call which control?
> This is for having a better understanding about how OL works?
> Thanks.
> 

A recommendation:
1) use Firefox
2) get Firebug
3) open Firebug in a new window
4) go to the Script tag, locate some code you recognize (that you 
understand in terms of execution order), and place a breakpoint
5) reload your page and step through the code

Tim

> 
> 
> 2007/10/4, Christopher Schmidt < crschmidt at metacarta.com 
> <mailto:crschmidt at metacarta.com>>:
> 
>     On Thu, Oct 04, 2007 at 11:39:07AM -0400, Michael Quentel wrote:
>      > What part of OL API would I find the code (actual class and function)
>      > pertaining to panning on mouse drag (when user does mouse down on
>     map,
>      > then drags mouse, then releases mouse, causing map to pan).
> 
>     OpenLayers.Handler.Drag handles the mouse events. This is used by the
>     OpenLayers.Control.DragPan to actually move the map.
> 
>      > I'm
>      > especially interested in finding the code that triggers another
>     request
>      > for a new tile or set of tiles from the server upon mouse drag.
> 
>     Well, that's a totally different section of the code :) The DragPan
>     control calls setCenter on the map, which calls moveTo on the Layers,
>     which then (sometimes) request snew tiles.
> 
>     Regards,
>     --
>     Christopher Schmidt
>     MetaCarta
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