[OpenLayers-Dev] Layer switched event

[Bart van den Eijnden]

Hi,

just listen for the changelayer event on the Map, and check for evt.property == "visibility".

Best regards,
Bart

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Bart van den Eijnden
OSGIS
bartvde at osgis.nl

On Mar 16, 2011, at 12:42 PM, Martin Saturka wrote:

> Hi,
> I could not find an event for situations when a layer is switched (by
> the LayerSwitcher control). I did put a hook there for checking, but
> may be that there is a better way for that. Could we have mentioned
> that another better way somewhere, or to have a hook at the switcher,
> like below, please?
> 
> OpenLayers.Control.LayerSwitcherMod =
> OpenLayers.Class(OpenLayers.Control.LayerSwitcher, {
>    checkRedraw: function() {
>        var redraw = false;
>        if ( !this.layerStates.length ||
>             (this.map.layers.length != this.layerStates.length) ) {
>            redraw = true;
>        } else {
>            for (var i=0, len=this.layerStates.length; i<len; i++) {
>                var layerState = this.layerStates[i];
>                var layer = this.map.layers[i];
>                if ( (layerState.name != layer.name) ||
>                     (layerState.inRange != layer.inRange) ||
>                     (layerState.id != layer.id) ||
>                     (layerState.visibility != layer.visibility) ) {
>                    redraw = true;
>                    break;
>                }
>            }
>        }
> 
>        if (redraw)
>        {
>            OpenLayers.Hooks.LayerSwitcher.layerSwitched(this);
>        }
> 
>        return redraw;
>    },
> 
>    CLASS_NAME: "OpenLayers.Control.LayerSwitcher"
> });
> 
> M.
> 
> -- 
> Martin Saturka
> Software Engineer, Sourcefabric
> www.sourcefabric.org
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