nl_tokens: PreviewThumbnails constructor .
pl_tokens: function PreviewThumbnails ( player ) { _classCallCheck ( this , PreviewThumbnails ) ; this . player = player ; this . thumbnails = [ ] ; this . loaded = false ; this . lastMouseMoveTime = Date . now ( ) ; this . mouseDown = <mask> ; this . loadedImages = [ ] ; this . elements = { thumb : { } , scrubbing : { } } ; this . load ( ) ; }