nl_tokens: set initial conditions so that different gestures can be identified
pl_tokens: function handleMouseDown ( event ) { mouseDown = true ; lastMouseX = <mask> . clientX ; lastMouseY = event . clientY ; startX = event . clientX ; startY = event . clientY ; //get coordinates within canvas (with the right orientation) var r = viewer . _canvas . getBoundingClientRect ( ) ; var viewX = startX - r . left ; var viewY = viewer . _height - ( startY - r . top ) ; //this is for picking id = viewer . _getID ( viewX , viewY ) ; /**
          * Occurs when mousedown event happens on underlying canvas.
          *
          * @event xViewer#mouseDown
          * @type {object}
          * @param {Number} id - product ID of the element or null if there wasn't any product under mouse
          */ viewer . _fire ( 'mouseDown' , { id : id } ) ; //keep information about the mouse button switch ( event . button ) { case 0 : button = 'left' ; break ; case 1 : button = 'middle' ; break ; case 2 : button = 'right' ; break ; default : button = 'left' ; break ; } viewer . _disableTextSelection ( ) ; }