function ScrollAction(optCallback, optDistanceFunc) {
    this.beginMeasuringHook = function() {};
    this.endMeasuringHook = function() {};

    this.callback_ = optCallback;
    this.distance_func_ = optDistanceFunc;
  }
// The page is scrolled down by a single scroll gesture.
The page is scrolled down by a single scroll gesture.
The page is scrolled down by a single scroll gesture .
function ScrollAction(optCallback, optDistanceFunc) {
    this.beginMeasuringHook = function() {};
    this.endMeasuringHook = function() {};
    this.callback_ = optCallback;
    this.distance_func_ = optDistanceFunc;
  }
function ScrollAction ( optCallback , optDistanceFunc ) { this . beginMeasuringHook = function ( ) { } ; this . endMeasuringHook = function ( ) { } ; this . callback_ = optCallback ; this . distance_func_ = optDistanceFunc ; }
The page is scrolled down by a single scroll gesture.
The page is scrolled down by a single scroll gesture .