message: expose event.stop method.
diff: @@ -2,6 +2,7 @@ import * as util from './core/util';
  import * as vec2 from './core/vector';
  import Draggable from './mixin/Draggable';
  import Eventful from './mixin/Eventful';
  +import * as eventTool from './core/event';
  var SILENT = 'silent';
  @@ -22,10 +23,15 @@ function makeEventPacket(eveType, targetInfo, event) {
  pinchScale: event.pinchScale,
  wheelDelta: event.zrDelta,
  zrByTouch: event.zrByTouch,
  - which: event.which
  + which: event.which,
  + stop: stopEvent
  };
  }
  +function stopEvent(event) {
  + eventTool.stop(this.event);
  +}
  +
  function EmptyProxy () {}
  EmptyProxy.prototype.dispose = function () {};
  