[OpenLayers-Dev] Layer switched event

[Martin Saturka]

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