give Layer.Vector a vertexremoved event, to be fired e.g. by the ModifyFeature control. r=bartvde (closes #3017)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11043 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/ModifyFeature.js

@@ -608,6 +608,11 @@ OpenLayers.Control.ModifyFeature = OpenLayers.Class(OpenLayers.Control, {
                vertex.geometry.parent) {
                 // remove the vertex
                 vertex.geometry.parent.removeComponent(vertex.geometry);
+                this.layer.events.triggerEvent("vertexremoved", {
+                    vertex: vertex.geometry,
+                    feature: this.feature,
+                    pixel: evt.xy
+                });
                 this.layer.drawFeature(this.feature, this.standalone ?
                                        undefined :
                                        this.selectControl.renderIntent);

lib/OpenLayers/Layer/Vector.js

@@ -90,6 +90,12 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
      *      property referencing the vertex modified (always a point geometry),
      *      and a *pixel* property referencing the pixel location of the
      *      modification.
+     * vertexremoved - Triggered when a vertex within any feature geometry
+     *      has been deleted.  Listeners will receive an object with a
+     *      *feature* property referencing the modified feature, a *vertex*
+     *      property referencing the vertex modified (always a point geometry),
+     *      and a *pixel* property referencing the pixel location of the
+     *      removal.
      * sketchstarted - Triggered when a feature sketch bound for this layer
      *      is started.  Listeners will receive an object with a *feature*
      *      property referencing the new sketch feature and a *vertex* property
@@ -110,8 +116,8 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
                   "beforefeaturesremoved", "featureremoved", "featuresremoved",
                   "beforefeatureselected", "featureselected", "featureunselected", 
                   "beforefeaturemodified", "featuremodified", "afterfeaturemodified",
-                  "vertexmodified", "sketchstarted", "sketchmodified",
-                  "sketchcomplete", "refresh"],
+                  "vertexmodified", "vertexremoved", "sketchstarted",
+                  "sketchmodified", "sketchcomplete", "refresh"],
 
     /**
      * APIProperty: isBaseLayer