add LayerSwitcher control. Currently, when added, this will simply loop through all the map layers, display a div (with text in it) which allows you tu turn the layer on or off. Layer visibility is a new concept in Layer.js, including a getter and setter, which uses the style.visibility prop to change the status of the layer.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@31 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer.js

@@ -10,6 +10,8 @@ OpenLayers.Layer.prototype = {
     // OpenLayers.Map
     map: null,
 
+    status: null,
+
     /**
     * @param {str} name
     */
@@ -18,6 +20,7 @@ OpenLayers.Layer.prototype = {
         this.div = OpenLayers.Util.createDiv();
         this.div.style.width="100%";
         this.div.style.height="100%";
+        this.status = true;
     },
     
     /**
@@ -35,5 +38,17 @@ OpenLayers.Layer.prototype = {
     moveTo: function (bound,zoomChanged) {
         // not implemented here
         return;
+    },
+    getVisibility: function() {
+        return this.status;
+    },
+    setVisibility: function(on) {
+        if (on) {
+            this.div.style.display="block";
+        } else {
+            this.div.style.display="none";
+        }
+        this.status = on;
     }
+    
 };