allow layers to prevent themselves from displaying in the layer switcher via the 'displayInLayerSwitcher' boolean option. modify example.html to show usage

git-svn-id: http://svn.openlayers.org/trunk/openlayers@1528 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

examples/example.html

@@ -24,7 +24,8 @@
                 "http://www2.dmsolutions.ca/cgi-bin/mswms_gmap",
                 {layers: "bathymetry,land_fn,park,drain_fn,drainage," +
                          "prov_bound,fedlimit,rail,road,popplace",
-                 transparent: "true", format: "image/png" });
+                 transparent: "true", format: "image/png" },
+                 { displayInLayerSwitcher: false });
 
             map.addLayers([ol_wms, jpl_wms, dm_wms]);
             map.addControl(new OpenLayers.Control.LayerSwitcher());

lib/OpenLayers/Control/LayerSwitcher.js

@@ -103,6 +103,8 @@ OpenLayers.Control.LayerSwitcher.prototype =
             var layer = this.map.layers[i];
             var baseLayer = layer.isBaseLayer;
 
+            if (baseLayer || layer.displayInLayerSwitcher) {
+
                 if (!baseLayer) {
                     containsOverlays = true;
                 }
@@ -145,7 +147,7 @@ OpenLayers.Control.LayerSwitcher.prototype =
                 groupDiv.appendChild(inputElem);
                 groupDiv.appendChild(labelSpan);
                 groupDiv.appendChild(br);
-
+            }
         }
 
         // if no overlays, dont display the overlay label

lib/OpenLayers/Layer.js

@@ -36,6 +36,11 @@ OpenLayers.Layer.prototype = {
      * @type boolean */
     alpha: false,
 
+    /** should the layer's name appear in the layer switcher?
+     * 
+     * @type boolean */
+    displayInLayerSwitcher: true,
+
   // OPTIONS
 
     /** @type Array */