Add SyntheticDragEvent with "dataTransfer" property

src/event/synthetic/SyntheticDragEvent.js

@@ -0,0 +1,44 @@
+/**
+ * Copyright 2013 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @providesModule SyntheticDragEvent
+ * @typechecks static-only
+ */
+
+"use strict";
+
+var SyntheticMouseEvent = require('SyntheticMouseEvent');
+
+/**
+ * @interface DragEvent
+ * @see http://www.w3.org/TR/DOM-Level-3-Events/
+ */
+var DragEventInterface = {
+  dataTransfer: null
+};
+
+/**
+ * @param {object} dispatchConfig Configuration used to dispatch this event.
+ * @param {string} dispatchMarker Marker identifying the event target.
+ * @param {object} nativeEvent Native browser event.
+ * @extends {SyntheticUIEvent}
+ */
+function SyntheticDragEvent(dispatchConfig, dispatchMarker, nativeEvent) {
+  SyntheticMouseEvent.call(this, dispatchConfig, dispatchMarker, nativeEvent);
+}
+
+SyntheticMouseEvent.augmentClass(SyntheticDragEvent, DragEventInterface);
+
+module.exports = SyntheticDragEvent;

src/eventPlugins/SimpleEventPlugin.js

@@ -25,6 +25,7 @@ var SyntheticEvent = require('SyntheticEvent');
 var SyntheticFocusEvent = require('SyntheticFocusEvent');
 var SyntheticKeyboardEvent = require('SyntheticKeyboardEvent');
 var SyntheticMouseEvent = require('SyntheticMouseEvent');
+var SyntheticDragEvent = require('SyntheticDragEvent');
 var SyntheticTouchEvent = require('SyntheticTouchEvent');
 var SyntheticUIEvent = require('SyntheticUIEvent');
 var SyntheticWheelEvent = require('SyntheticWheelEvent');
@@ -315,6 +316,11 @@ var SimpleEventPlugin = {
         /* falls through */
       case topLevelTypes.topContextMenu:
       case topLevelTypes.topDoubleClick:
+      case topLevelTypes.topMouseDown:
+      case topLevelTypes.topMouseMove:
+      case topLevelTypes.topMouseUp:
+        EventConstructor = SyntheticMouseEvent;
+        break;
       case topLevelTypes.topDrag:
       case topLevelTypes.topDragEnd:
       case topLevelTypes.topDragEnter:
@@ -323,10 +329,7 @@ var SimpleEventPlugin = {
       case topLevelTypes.topDragOver:
       case topLevelTypes.topDragStart:
       case topLevelTypes.topDrop:
-      case topLevelTypes.topMouseDown:
-      case topLevelTypes.topMouseMove:
-      case topLevelTypes.topMouseUp:
-        EventConstructor = SyntheticMouseEvent;
+        EventConstructor = SyntheticDragEvent;
         break;
       case topLevelTypes.topTouchCancel:
       case topLevelTypes.topTouchEnd: