Loading strategies now trigger loadstart and loadend events. r=crschmidt (closes #1840)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@8973 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Strategy/BBOX.js

@@ -176,6 +176,7 @@ OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, {
      */
     triggerRead: function() {
         this.layer.protocol.abort(this.response);
+        this.layer.events.triggerEvent("loadstart");
         this.response = this.layer.protocol.read({
             filter: this.createFilter(),
             callback: this.merge,
@@ -231,6 +232,7 @@ OpenLayers.Strategy.BBOX = OpenLayers.Class(OpenLayers.Strategy, {
             }
             this.layer.addFeatures(features);
         }
+        this.layer.events.triggerEvent("loadend");
     },
    
     CLASS_NAME: "OpenLayers.Strategy.BBOX" 

lib/OpenLayers/Strategy/Fixed.js

@@ -71,6 +71,7 @@ OpenLayers.Strategy.Fixed = OpenLayers.Class(OpenLayers.Strategy, {
      * Tells protocol to load data and unhooks the visibilitychanged event
      */
     load: function() {
+        this.layer.events.triggerEvent("loadstart");
         this.layer.protocol.read({
             callback: this.merge,
             scope: this
@@ -101,6 +102,7 @@ OpenLayers.Strategy.Fixed = OpenLayers.Class(OpenLayers.Strategy, {
             }
             this.layer.addFeatures(features);
         }
+        this.layer.events.triggerEvent("loadend");
     },
 
     CLASS_NAME: "OpenLayers.Strategy.Fixed"