Adding a cancelled flag to DraggableEvent to indicate if a drag e…

…nded

because of a cancelling operation like `esc` key, etc.

CHANGELOG.md

@@ -1,11 +1,13 @@
 # Changelog
 
-## Version 0.1.2 (?)
+## Version 0.1.2 (2014-07-22)
 
 * Correcting small bug that occurred when setSelectionRange() was called on 
   an element that does not support it.
 * Fix Pointer Event bug: Too many event listeners in move, end, cancel.
 * Fix for Bug #1 - Not working in Windows 8.1 IE11
+* Adding a `cancelled` flag to `DraggableEvent` to indicate if a drag ended 
+  because of a cancelling operation like `esc` key, etc.
 
 
 ## Version 0.1.1 (2014-07-21)

lib/src/draggable.dart

@@ -238,11 +238,10 @@ class Draggable {
    * be a [TouchEvent], a [MouseEvent], a [KeyboardEvent], or a [Event] (when 
    * focus is lost). 
    * 
-   * The [target] is the actual target receiving the event.
-   * 
-   * The [position] is the page position of the event. 
+   * Set [cancelled] to true to indicate that this drag ended through a 
+   * cancel oparation like hitting the `esc` key.
    */
-  void _handleDragEnd(Event event) {
+  void _handleDragEnd(Event event, {cancelled: false}) {
     // Only handle drag end if the user actually did drag and not just clicked.
     if (_currentDrag.started) {
 
@@ -253,7 +252,8 @@ class Draggable {
 
       // Fire dragEnd event.
       if (_onDragEnd != null) {
-        _onDragEnd.add(new DraggableEvent._(event, _currentDrag));
+        _onDragEnd.add(new DraggableEvent._(event, _currentDrag, 
+            cancelled: cancelled));
       }
 
       // Prevent TouchEvent from emulating a click after touchEnd event.
@@ -438,14 +438,19 @@ class DraggableEvent {
   /// position).
   final Point position;
 
+  /// Indicates if this [DraggableEvent] was [cancelled]. This is currently 
+  /// only used for [onDragEnd] events to indicate a drag end through a 
+  /// cancelling oparation like `esc` key or windows loosing focus.
+  final bool cancelled;
+
   /**
    * Private constructor for [DraggableEvent].
    */
-  DraggableEvent._(this.originalEvent, _DragInfo dragInfo)
+  DraggableEvent._(this.originalEvent, _DragInfo dragInfo, {this.cancelled: false})
       : draggableElement = dragInfo.element,
+        avatarHandler = dragInfo.avatarHandler,
         startPosition = dragInfo.startPosition,
-        position = dragInfo.position,
-        avatarHandler = dragInfo.avatarHandler;
+        position = dragInfo.position;
 }
 
 /**

lib/src/draggable_manager.dart

@@ -118,8 +118,8 @@ abstract class _EventManager {
    * Handles all cancel events (touchCancel and pointerCancel).
    */
   void handleCancel(Event event) {
-    // Drag end.
-    drg._handleDragEnd(event);
+    // Drag end with the cancelled flag.
+    drg._handleDragEnd(event, cancelled: true);
   }
 
   /**