#905 - give the drag handler back its start property - controls use but do not modify these handler properties

git-svn-id: http://svn.openlayers.org/trunk/openlayers@3906 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Handler/Drag.js

@@ -40,10 +40,16 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
 
     /** 
      * Property: last
-     * {<OpenLayers.Pixel>} 
+     * {<OpenLayers.Pixel>} The last pixel location of the drag.
      */
     last: null,
 
+    /** 
+     * Property: start
+     * {<OpenLayers.Pixel>} The first pixel location of the drag.
+     */
+    start: null,
+
     /**
      * Property: oldOnselectstart
      * {Function}
@@ -90,6 +96,7 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
         if (this.checkModifiers(evt) && OpenLayers.Event.isLeftClick(evt)) {
             this.started = true;
             this.dragging = false;
+            this.start = evt.xy;
             this.last = evt.xy;
             // TBD replace with CSS classes
             this.map.div.style.cursor = "move";

tests/Handler/test_Drag.html

@@ -83,7 +83,7 @@
     }
 
     function test_Handler_Drag_callbacks(t) {
-        t.plan(28);
+        t.plan(30);
         
         var map = new OpenLayers.Map('map', {controls: []});
 
@@ -141,6 +141,9 @@
         map.events.triggerEvent("mousedown", testEvents.down);
         t.ok(handler.started, "mousedown sets the started flag to true");
         t.ok(!handler.dragging, "mouse down sets the dragging flag to false");
+        t.ok(handler.start.x == testEvents.down.xy.x &&
+             handler.start.y == testEvents.down.xy.y,
+             "mouse down sets handler.start correctly");
         t.ok(handler.last.x == testEvents.down.xy.x &&
              handler.last.y == testEvents.down.xy.y,
              "mouse down sets handler.last correctly");
@@ -159,6 +162,9 @@
         handler.started = true;
         map.events.triggerEvent("mousemove", testEvents.move);
         t.ok(handler.dragging, "mousemove sets the dragging flag to true");
+        t.ok(handler.start.x == testEvents.down.xy.x &&
+             handler.start.y == testEvents.down.xy.y,
+             "mouse move leaves handler.start alone");
         t.ok(handler.last.x == testEvents.move.xy.x &&
              handler.last.y == testEvents.move.xy.y,
              "mouse move sets handler.last correctly");