[OpenLayers-Dev] Patch: NavigationHistory tracks base layer changes

[Jochen Topf]

Hi!

I thought about a more general approach but discarded it, because I don't know
about OL internals too much and, more importantly, about what other people
might want to do. So this patch works for me and if you want to take it up
into the OL trunk, thats great, but if not I'll just use it in my copy of the
code.

Jochen

On Tue, Aug 25, 2009 at 02:24:03PM -0600, Tim Schaub wrote:
> Date: Tue, 25 Aug 2009 14:24:03 -0600
> From: Tim Schaub <tschaub at opengeo.org>
> To: dev at openlayers.org
> Subject: Re: [OpenLayers-Dev] Patch: NavigationHistory tracks base layer
> 	changes
> 
> Hey-
> 
> Jochen Topf wrote:
> > Hi!
> > 
> > Enclosed a small patch to optionally also track base layer changes in the
> > NavigationHistory Control. Just set the trackBaseLayerChange option to true.
> > Default is false, ie. old behaviour.
> > 
> 
> Nice to see how small the change is.  However, I feel like this is 
> pretty application specific.  Another application might want to restore 
> layer visibility (though this takes it even farther from a navigation 
> history control).  And this patch wouldn't work with an application that 
> allowed layers to be removed.
> 
> I can imagine a patch that added a couple events to the control.  When a 
> change event was fired, any listener could modify the state object. 
> When a restore event was fired, a listener could use any custom state 
> properties to restore the state.
> 
> Since this control only listens for "moveend" it will always be a 
> navigation history control.  Firing events and letting applications 
> decide how to represent and restore state doesn't muddle the purpose of 
> the control in the library.
> 
> If you're interested in this (events based approach), I'd be happy to 
> review a patch (attached to a ticket).  Though I'll likely need a ping 
> to remember to check it out.
> 
> Tim
> 
> > I use this at http://bestofosm.org/ .
> > 
> > Jochen
> > 
> > 
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> 
> -- 
> Tim Schaub
> OpenGeo - http://opengeo.org
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-- 
Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-721-388298