[Users] MapPanel Class and allOverlays properties

[Andreas Hocevar]

Hi Arnaud,

no need to change the MapPanel class. The allOverlays:true property is
set using applyIf, which means only if this property is not provided by
the user.

So you just need a slightly modified mappanel config:
var mapPanel = new GeoExt.MapPanel({
        map: {
            allOverlays: false,
            controls: [
                new OpenLayers.Control.Navigation()
                ,new OpenLayers.Control.PanPanel()
                ,new OpenLayers.Control.ZoomPanel()
            ]
        }
        ,region : 'center'
        ,title : 'map'
        ,layers: [bluemarble]
        ,extent: [-5, 35, 15, 55]
    });

Arnaud Vandecasteele wrote:
> So my question is why the GeoExt developpers have decided to force the
> allOverlays properties to false instead of true?

Because most users will be working with OGC services, which don't make a
distinction between base layers and overlays.

Also note that you can still have exclusive layers, by leaving
allOverlays:true and configuring the tree differently. The advantage is
that you can drag/drop overlays to base layers and vice versa. The
config option to look at (for the layer nodes) is checkedGroup.

Regards,
Andreas.

-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.