// following code is MIT licensed (C) Gary Haran 2007

/**
* Provide the same behavior as window.scrollTo to divs with overflow without removing
* the ability to scroll a page to a given element. See: http://www.garyharan.com/index.php/2007/11/26/how-to-unobtrusively-scroll-a-div-with-prototype-scriptaculous/
*/
Element.addMethods({
  scrollTo: function(element, left, top){
    var element = $(element);
    if (arguments.length == 1){
      var pos = element.cumulativeOffset();
      window.scrollTo(pos[0], pos[1]);
    } else {
      element.scrollLeft = left;
      element.scrollTop  = top;
    }
    return element;
  }
});

/**
* Effect.Scroll allows you to animate scrolling on a page (or div w/ overflow: scroll || auto)
*/
Effect.Scroll = Class.create();
Object.extend(Object.extend(Effect.Scroll.prototype, Effect.Base.prototype), {
  initialize: function(element) {
    this.element = $(element);
    if(!this.element) throw(Effect._elementDoesNotExistError);
    this.start(Object.extend({x: 0, y: 0}, arguments[1] || {}));
  },
  setup: function() {
    var scrollOffsets = (this.element == window)
                ? document.viewport.getScrollOffsets()
                : Element._returnOffset(this.element.scrollLeft, this.element.scrollTop) ;
    this.originalScrollLeft = scrollOffsets.left;
    this.originalScrollTop  = scrollOffsets.top;
  },
  update: function(pos) {
    this.element.scrollTo(Math.round(this.options.x * pos + this.originalScrollLeft), Math.round(this.options.y * pos + this.originalScrollTop));
  }
});

/*
 * The prototype library required for this effect and the one required for the version of rails are out of sync
 * The methods from the newer prototype libray needed for this effect are defined here
*/

Element._returnOffset = function(l, t) {
  var result = [l, t];
  result.left = l;
  result.top = t;
  return result;
};