Fixes #2336 mouse wheel problem on custom time element (#2366)

* Fix mouse zoom on currentTime
* Fix customTime mousewheel bug

lib/timeline/component/CustomTime.js

@@ -77,8 +77,22 @@ CustomTime.prototype._create = function() {
   drag.style.left = '-10px';
   drag.style.height = '100%';
   drag.style.width = '20px';
-  bar.appendChild(drag);
 
+  function onMouseWheel (e) {
+    this.body.range._onMouseWheel(e);
+  }
+
+  if (drag.addEventListener) {
+    // IE9, Chrome, Safari, Opera
+    drag.addEventListener("mousewheel", onMouseWheel.bind(this), false);
+    // Firefox
+    drag.addEventListener("DOMMouseScroll", onMouseWheel.bind(this), false);
+  } else {
+    // IE 6/7/8
+    drag.attachEvent("onmousewheel", onMouseWheel.bind(this));
+  }
+
+  bar.appendChild(drag);
   // attach event listeners
   this.hammer = new Hammer(drag);
   this.hammer.on('panstart', this._onDragStart.bind(this));

lib/timeline/component/css/currenttime.css

@@ -2,4 +2,5 @@
   background-color: #FF7F6E;
   width: 2px;
   z-index: 1;
+  pointer-events: none;
 }