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

/*
Script: Scroller.js
    Class which scrolls the contents of any Element (including the window) when the mouse reaches the Element's boundaries.

License:
    MIT-style license.
*/

var Scroller = new Class({

    Implements: [Events, Options],

    options: {
        area: 20,
        velocity: 1,
        onChange: function(x, y){
            this.element.scrollTo(x, y);
        }
    },

    initialize: function(element, options){
        this.setOptions(options);
        this.element = $(element);
        this.listener = ($type(this.element) != 'element') ? $(this.element.getDocument().body) : this.element;
        this.timer = null;
        this.coord = this.getCoords.bind(this);
    },

    start: function(){
        this.listener.addEvent('mousemove', this.coord);
    },

    stop: function(){
        this.listener.removeEvent('mousemove', this.coord);
        this.timer = $clear(this.timer);
    },

    getCoords: function(event){
        this.page = (this.listener.get('tag') == 'body') ? event.client : event.page;
        if (!this.timer) this.timer = this.scroll.periodical(50, this);
    },

    scroll: function(){
        var size = this.element.getSize(), scroll = this.element.getScroll(), pos = this.element.getPosition(), change = {'x': 0, 'y': 0};
        for (var z in this.page){
            if (this.page[z] < (this.options.area + pos[z]) && scroll[z] != 0)
                change[z] = (this.page[z] - this.options.area - pos[z]) * this.options.velocity;
            else if (this.page[z] + this.options.area > (size[z] + pos[z]) && size[z] + size[z] != scroll[z])
                change[z] = (this.page[z] - size[z] + this.options.area - pos[z]) * this.options.velocity;
        }
        if (change.y || change.x) this.fireEvent('change', [scroll.x + change.x, scroll.y + change.y]);
    }

});