fix No click on drag handler, r=erilem (closes #3210)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@11783 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Handler/Drag.js

@@ -50,6 +50,13 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
      */
     dragging: false,
 
+    /**
+     * Property: touch
+     * {Boolean} When a touchstart event is fired, touch will be true and all
+     *     mouse related listeners will do nothing.
+     */
+    touch: false,
+
     /** 
      * Property: last
      * {<OpenLayers.Pixel>} The last pixel location of the drag.
@@ -336,6 +343,17 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
      * {Boolean} Let the event propagate.
      */
     touchstart: function(evt) {
+        if (!this.touch) {
+            this.touch = true;
+            // unregister mouse listeners
+            this.map.events.un({
+                mousedown: this.mousedown,
+                mouseup: this.mouseup,
+                mousemove: this.mousemove,
+                click: this.click,
+                scope: this
+            });
+        }
         return this.dragstart(evt);
     },