* Remove default styling from the Feature.Vector class.

* Add a 'style' property to the layer.
 * When a feature is added to a layer, either uses the style on the 
   layer, or uses the default feature style.
 * Add test to Layer.Vector for this funcionality 
 * Adds a preFeatureInsert hook to change a feature *before* 
   drawing it.
 * Change openmnnd demo to include the use of preFeatureInsert
   and style attribute on layer.


git-svn-id: http://svn.openlayers.org/trunk/openlayers@2949 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Vector.js

@@ -36,6 +36,9 @@ OpenLayers.Layer.Vector.prototype =
     /** @type {Boolean} */
     reportError: true, 
 
+    /** @type {Object} */
+    style: null,
+
     /**
      * List of supported Renderer classes. Add to this list to
      * add support for additional renderers. This list is ordered:
@@ -224,6 +227,16 @@ OpenLayers.Layer.Vector.prototype =
             //give feature reference to its layer
             feature.layer = this;
 
+            if (!feature.style) {
+                if (this.style) {
+                    feature.style = OpenLayers.Util.extend({}, this.style);
+                } else {
+                    feature.style = OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['default']);
+                }    
+            }
+
+            this.preFeatureInsert(feature);
+
             if (this.drawn) {
                 this.renderer.drawGeometry(feature.geometry, feature.style);
             }
@@ -315,6 +328,17 @@ OpenLayers.Layer.Vector.prototype =
      */
     onFeatureInsert: function(feature) {
     },
+    
+    /**
+     * method called before a feature is inserted.
+     * Does nothing by default. Override this if you
+     * need to do something when features are first added to the
+     * layer, but before they are drawn, such as adjust the style.
+     * 
+     * @param {OpenLayers.Feature.Vector} feature
+     */
+    preFeatureInsert: function(feature) {
+    },
 
     /** @final @type String */
     CLASS_NAME: "OpenLayers.Layer.Vector"