src/js/controls/DragProxy.js
function( offsetX, offsetY, event ) {

		event = event.originalEvent && event.originalEvent.touches ? event.originalEvent.touches[ 0 ] : event;

		var x = event.pageX,
			y = event.pageY,
			isWithinContainer = x > this._minX && x < this._maxX && y > this._minY && y < this._maxY;

		if( !isWithinContainer && this._layoutManager.config.settings.constrainDragToContainer === true ) {
			return;
		}

		this._setDropPosition( x, y );
	}
function( offsetX, offsetY, event ) {

		event = event.originalEvent && event.originalEvent.touches ? event.originalEvent.touches[ 0 ] : event;

		var x = event.pageX,
			y = event.pageY,
			isWithinContainer = x > this._minX && x < this._maxX && y > this._minY && y < this._maxY;

		if( !isWithinContainer && this._layoutManager.config.settings.constrainDragToContainer === true ) {
			return;
		}

		this._setDropPosition( x, y );
	}
function ( offsetX , offsetY , event ) { event = event . originalEvent && event . originalEvent . touches ? event . originalEvent . touches [ 0 ] : event ; var x = event . pageX , y = event . pageY , isWithinContainer = x > this . _minX && x < this . _maxX && y > this . _minY && y < this . _maxY ; if ( ! isWithinContainer && this . _layoutManager . config . settings . constrainDragToContainer === true ) { return ; } this . _setDropPosition ( x , y ) ; }
Callback on every mouseMove event during a drag. Determines if the drag is
still within the valid drag area and calls the layoutManager to highlight the
current drop area

@param   {Number} offsetX The difference from the original x position in px
@param   {Number} offsetY The difference from the original y position in px
@param   {jQuery DOM event} event

@private

@returns {void}
Callback on every mouseMove event during a drag . Determines if the drag is still within the valid drag area and calls the layoutManager to highlight the current drop area