Simplified ISequence API; add object property also for browser events.

src/ol/event/Drag.js

@@ -1,5 +1,4 @@
 goog.provide('ol.event.Drag');
-goog.provide('ol.event.DragEvent');
 
 goog.require('ol.event.ISequence');
 goog.require('ol.event.Events');
@@ -52,67 +51,38 @@ ol.event.Drag.prototype.dispatchEvent = function(e) {
         } else if (e.type === goog.fx.Dragger.EventType.END) {
             e.type = ol.event.Drag.EventType.DRAGEND;
         }
+        e.target = e.browserEvent.target;
+        e.dx = e.clientX - this.previousX_;
+        e.dy = e.clientY - this.previousY_;
     }
-    this.target_.dispatchEvent(/** @type {Event} */ (e));
+    this.target_.triggerEvent(e.type, /** @type {Object} (e.type) */ (e));
     return goog.base(this, 'dispatchEvent', e);
 };
 
 /** @inheritDoc */
 ol.event.Drag.prototype.startDrag = function(e) {
+    goog.base(this, 'startDrag', e);
     this.previousX_ = e.clientX;
     this.previousY_ = e.clientY;
-    goog.base(this, 'startDrag', e);
-};
-
-/** @inheritDoc */
-ol.event.Drag.prototype.doDrag = function(e, x, y, dragFromScroll) {
-    e.dx = e.clientX - this.previousX_;
-    e.dy = e.clientX - this.previousY_;
-    goog.base(this, 'doDrag', e, x, y, dragFromScroll);
 };
 
 /** @override */
+ol.event.Drag.prototype.doDrag = function(e, x, y, dragFromScroll) {
+    goog.base(this, 'doDrag', e, x, y, dragFromScroll);
+    this.previousX_ = e.clientX;
+    this.previousY_ = e.clientY;
+};
+
+/** @inheritDoc */
 ol.event.Drag.prototype.defaultAction = function(x, y) {};
 
 /** @inheritDoc */
 ol.event.Drag.prototype.destroy = ol.event.Drag.prototype.dispose;
 
+
 ol.event.addSequenceProvider('drag', ol.event.Drag);
 
 
-/**
- * Object representing a drag event
- *
- * @param {string} type Event type.
- * @param {goog.fx.Dragger} dragobj Drag object initiating event.
- * @param {number} clientX X-coordinate relative to the viewport.
- * @param {number} clientY Y-coordinate relative to the viewport.
- * @param {goog.events.BrowserEvent} browserEvent Object representing the
- *     browser event that caused this drag event.
- * @constructor
- * @extends {goog.fx.DragEvent}
- */
-ol.event.DragEvent = function(type, dragobj, clientX, clientY, browserEvent) {
-    
-    goog.base(this, type, dragobj, clientX, clientY, browserEvent);
-    
-    /**
-     * The move delta in X direction since the previous drag event
-     *
-     * @type {number}
-     */
-    this.dx = 0;
-    
-    /**
-     * The move delta in Y direction since the previous drag event
-     *
-     * @type {number}
-     */
-    this.dy = 0;
-};
-goog.inherits(ol.event.DragEvent, goog.fx.DragEvent);
-
-
 /**
  * @type {Object.<string, string>}
  */

src/ol/event/Events.js

@@ -136,7 +136,7 @@ ol.event.Events.prototype.setElement = function(element) {
         for (t in types) {
             // register the event cross-browser
             goog.events.unlisten(
-                this.element_, types[t], this.dispatchEvent, true, this
+                this.element_, types[t], this.handleBrowserEvent, true, this
             );
         }
         this.destroySequences();
@@ -148,7 +148,7 @@ ol.event.Events.prototype.setElement = function(element) {
         for (t in types) {
             // register the event cross-browser
             goog.events.listen(
-                element, types[t], this.dispatchEvent, true, this
+                element, types[t], this.handleBrowserEvent, true, this
             );
         }
     }
@@ -243,15 +243,14 @@ ol.event.Events.prototype.triggerEvent = function(type, opt_evt) {
 };
 
 /**
- * Basically just a wrapper to the parent's dispatchEvent() function, but takes 
- * care to set a property 'xy' on the event with the current mouse position and
- * normalize clientX and clientY for multi-touch events.
+ * Prepares browser events before they are dispatched. This takes care to set a
+ * property 'xy' on the event with the current pointer position (if 
+ * {@code includeXY} is set to true), and normalizes clientX and clientY for
+ * multi-touch events.
  * 
  * @param {Event} evt Event object.
- * @return {boolean} If anyone called preventDefault on the event object (or
- *     if any of the handlers returns false this will also return false.
  */
-ol.event.Events.prototype.dispatchEvent = function(evt) {
+ol.event.Events.prototype.handleBrowserEvent = function(evt) {
     var type = evt.type,
         listeners = goog.events.getListeners(this.element_, type, false)
             .concat(goog.events.getListeners(this.element_, type, true));
@@ -276,7 +275,7 @@ ol.event.Events.prototype.dispatchEvent = function(evt) {
             evt.xy = goog.style.getRelativePosition(evt, this.element_);
         }
     }
-    return goog.base(this, 'dispatchEvent', evt);
+    this.triggerEvent(evt.type, evt);
 };
 
 /**

src/ol/event/ISequence.js

@@ -4,10 +4,10 @@ goog.provide('ol.event.ISequence');
  * Interface for event sequences. Event sequences map sequences of native
  * browser events to high level events that the sequence provides.
  *
- * Implementations are expected to call dispatchEvent on the {@code target} to
- * to fire their high level events. 
+ * Implementations are expected to call {@code triggerEvent} on the
+ * {@code target} to to fire their high level events.
  *
- * Implementations can expect the {@code target}'s {@code getElement()} method
+ * Implementations can expect the {@code target}'s {@code getElement} method
  * to return an {Element} at construction time.
  *
  * @interface