fixed item dragging offset in the x direction

lib/timeline/Core.js

@@ -624,22 +624,6 @@ Core.prototype.getCurrentTime = function() {
 // TODO: move this function to Range
 Core.prototype._toTime = function(x) {
   return DateUtil.toTime(this.body, this.range, x, this.props.center.width);
-  //var startDate = new Date(this.options.hide.start).getTime();
-  //var endDate = new Date(this.options.hide.end).getTime();
-  //var duration = endDate - startDate;
-  //if (!(startDate >= this.range.start && endDate < this.range.end)) {
-  //  duration = 0;
-  //}
-  //
-  //var conversion = this.range.conversion(this.props.center.width, duration);
-  //var time = new Date(x / conversion.scale + conversion.offset);
-  //
-  //if (time >= endDate && startDate >= this.range.start && endDate < this.range.end) {
-  //  time -= duration;
-  //}
-  //
-  //
-  //return time;
 };
 
 /**

lib/timeline/component/ItemSet.js

@@ -1100,17 +1100,18 @@ ItemSet.prototype._onDrag = function (event) {
   if (this.touchParams.itemProps) {
     var me = this;
     var snap = this.body.util.snap || null;
+    var xOffset = this.body.dom.root.offsetLeft + this.body.domProps.left.width;
 
     // move
     this.touchParams.itemProps.forEach(function (props) {
       var newProps = {};
       if ('start' in props && !('end' in props)) {  // only start in props
-        var start = me.body.util.toTime(event.gesture.center.clientX)
+        var start = me.body.util.toTime(event.gesture.center.clientX - xOffset);
         newProps.start = snap ? snap(start) : start;
       }
       else if ('start' in props) {                  // start and end in props
-        var current = me.body.util.toTime(event.gesture.center.clientX);
-        var initial = me.body.util.toTime(props.initialX);
+        var current = me.body.util.toTime(event.gesture.center.clientX - xOffset);
+        var initial = me.body.util.toTime(props.initialX - xOffset);
         var offset = current - initial;
         var start = new Date(props.start + offset);
         var end = new Date(props.end + offset);
@@ -1119,7 +1120,7 @@ ItemSet.prototype._onDrag = function (event) {
         newProps.end = snap ? snap(end) : end;
       }
       else if ('end' in props) {                    // only end in props
-        var end = me.body.util.toTime(event.gesture.center.clientX);
+        var end = me.body.util.toTime(event.gesture.center.clientX - xOffset);
         newProps.end = snap ? snap(end) : end;
       }