//MooTools More, <http://mootools.net/more>. Copyright (c) 2006-2008 Valerio Proietti, <http://mad4milk.net>, MIT Style License.

Fx.Scroll = new Class({ Extends: Fx, options: { offset: { x: 0, y: 0 }, wheelStops: true }, initialize: function(B, A) {
    this.element = this.subject = $(B); this.parent(A); var D = this.cancel.bind(this, false);
    if ($type(this.element) != "element") { this.element = $(this.element.getDocument().body); } var C = this.element; if (this.options.wheelStops) {
        this.addEvent("start", function() {
            C.addEvent("mousewheel", D);
        }, true); this.addEvent("complete", function() { C.removeEvent("mousewheel", D); }, true);
    }
}, set: function() {
    var A = Array.flatten(arguments); this.element.scrollTo(A[0], A[1]);
}, compute: function(E, D, C) { var B = []; var A = 2; A.times(function(F) { B.push(Fx.compute(E[F], D[F], C)); }); return B; }, start: function(C, H) {
    if (!this.check(arguments.callee, C, H)) {
        return this;
    } var E = this.element.getSize(), F = this.element.getScrollSize(); var B = this.element.getScroll(), D = { x: C, y: H }; for (var G in D) {
        var A = F[G] - E[G]; if ($chk(D[G])) {
            D[G] = ($type(D[G]) == "number") ? D[G].limit(0, A) : A;
        } else { D[G] = B[G]; } D[G] += this.options.offset[G];
    } return this.parent([B.x, B.y], [D.x, D.y]);
}, toTop: function() { return this.start(false, 0); }, toLeft: function() {
    return this.start(0, false);
}, toRight: function() { return this.start("right", false); }, toBottom: function() { return this.start(false, "bottom"); }, toElement: function(B) {
    var A = $(B).getPosition(this.element);
    return this.start(A.x, A.y);
}
});