nl_tokens: Called whenever the user presses the mouse button on the scrollview
pl_tokens: function _mouseDown ( <mask> ) { // Check whether mouse-scrolling is enabled if ( ! this . options . mouseMove ) { return ; } // Reset any previous mouse-move operation that has not yet been // cleared. if ( this . _scroll . mouseMove ) { this . releaseScrollForce ( this . _scroll . mouseMove . delta ) ; } // Calculate start of move operation var current = [ event . clientX , event . clientY ] ; var time = _getEventTimestamp ( event ) ; this . _scroll . mouseMove = { delta : 0 , start : current , current : current , prev : current , time : time , prevTime : time } ; // Apply scroll force this . applyScrollForce ( this . _scroll . mouseMove . delta ) ; }