break out post-rendering into seperate function to be defined in page. This

removes the tie between the LayerSwitcher and Ext that I had in my first
commit. 


git-svn-id: http://svn.openlayers.org/trunk/openlayers@7381 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/LayerSwitcher.js

@@ -254,6 +254,7 @@ OpenLayers.Control.LayerSwitcher =
             };
         }    
 
+        this.layerDivList = [];     
         var layers = this.map.layers.slice();
         if (!this.ascending) { layers.reverse(); }
         for( var i = 0; i < layers.length; i++) {
@@ -273,6 +274,10 @@ OpenLayers.Control.LayerSwitcher =
                 var checked = (baseLayer) ? (layer == this.map.baseLayer)
                                           : layer.getVisibility();
     
+                var layerDiv = document.createElement("div"); 
+                layerDiv.id = this.id+"_layerDiv_"+layer.id;
+                layerDiv.className = "olControlLayerSwitcherLayerDiv";
+
                 // create input element
                 var inputElem = document.createElement("input");
                 inputElem.id = "input_" + layer.name;
@@ -307,9 +312,6 @@ OpenLayers.Control.LayerSwitcher =
                     OpenLayers.Function.bindAsEventListener(this.onInputClick,
                                                             context)
                 );
-                // create line break
-                var br = document.createElement("br");
-    
                 
                 var groupArray = (baseLayer) ? this.baseLayers
                                              : this.dataLayers;
@@ -319,12 +321,16 @@ OpenLayers.Control.LayerSwitcher =
                     'labelSpan': labelSpan
                 });
                                                      
-    
+         
                 var groupDiv = (baseLayer) ? this.baseLayersDiv
                                            : this.dataLayersDiv;
-                groupDiv.appendChild(inputElem);
-                groupDiv.appendChild(labelSpan);
-                groupDiv.appendChild(br);
+                
+                layerDiv.appendChild(inputElem);
+                layerDiv.appendChild(labelSpan);
+                this.layerDivList.push(layerDiv);
+                groupDiv.appendChild(layerDiv);
+                
+                this.layerRenderAdditional(layerDiv, layer); 
             }
         }
 
@@ -334,9 +340,13 @@ OpenLayers.Control.LayerSwitcher =
         // if no baselayers, dont display the baselayer label
         this.baseLbl.style.display = (containsBaseLayers) ? "" : "none";        
 
+        
         return this.div;
     },
-
+    
+    layerRenderAdditional: function(layerDiv, layer) {
+    },
+    
     /** 
      * Method:
      * A label has been clicked, check or uncheck its corresponding input