/**************************************************************

    Script        : Background Slider
    Version        : 1.1
    Authors        : Samuel Birch
    Desc        : Slides a layer to a given elements position and dimensions.
    Licence        : Open Source MIT Licence

**************************************************************/

var BackgroundSlider = new Class({

    getOptions: function(){
        return {
            duration: 300,
            wait: 500,
            transition: Fx.Transitions.sineInOut,
            className: false,
            fixHeight: false,
            fixWidth: false,
            id: false,
            padding: {top:0,right:0,bottom:0,left:0},
            onClick: this.setStart,
            mouseOver: true
        };
    },

    initialize: function(elements, options){
        this.setOptions(this.getOptions(), options);

        this.elements = $$(elements);
        this.timer = 0;

        if(this.options.id){
            this.bg = $(this.options.id);
        }else{
            this.bg = new Element('div').setProperty('id','BgSlider_'+new Date().getTime()).injectInside(document.body);
            if(this.options.className){
                this.bg.addClass(this.options.className);
            }
        }

        this.effects = new Fx.Styles(this.bg, {duration: this.options.duration, transition: this.options.transition});

        this.elements.each(function(el,i){
            if(this.options.mouseOver){
                el.addEvent('mouseover', this.move.bind(this,el));
                el.addEvent('mouseout', this.reset.bind(this));
            }
            el.addEvent('click', this.options.onClick.bind(this, el))
            if(el.hasClass('bgStart')){
                this.set(el);
            }
        },this);

        window.addEvent('resize',function(){
            this.move(this.startElement);
        }.bind(this));

    },

    setStart: function(el){
        this.startElement = el;
    },

    set: function(el){
        this.setStart(el);
        var pos = el.getCoordinates();

        if(this.options.id){
            this.options.padding.top = this.bg.getStyle('paddingTop').toInt();
            this.options.padding.right = this.bg.getStyle('paddingRight').toInt();
            this.options.padding.bottom = this.bg.getStyle('paddingBottom').toInt();
            this.options.padding.left = this.bg.getStyle('paddingLeft').toInt();
            this.bg.setStyle('padding','0px');
        }

        var obj = {};
        obj.top = (pos.top-this.options.padding.top)+'px';
        obj.left = (pos.left-this.options.padding.left)+'px';
        if(!this.options.fixHeight){obj.height = (pos.height+this.options.padding.top+this.options.padding.bottom)+'px'};
        if(!this.options.fixWidth){obj.width = (pos.width+this.options.padding.left+this.options.padding.right)+'px'};

        this.bg.setStyles(obj);
    },

    reset: function(){
        if(this.options.wait){
            this.timer = this.move.delay(this.options.wait, this, this.startElement);
        }
    },

    move: function(el){
        $clear(this.timer);
        var pos = el.getCoordinates();

        this.effects.stop();

        var obj = {};
        obj.top = pos.top-this.options.padding.top;
        obj.left = pos.left-this.options.padding.left;
        if(!this.options.fixHeight){obj.height = pos.height+this.options.padding.top+this.options.padding.bottom};
        if(!this.options.fixWidth){obj.width = pos.width+this.options.padding.left+this.options.padding.right};

        this.effects.start(obj);

    }

});
BackgroundSlider.implement(new Options);
BackgroundSlider.implement(new Events);

/*************************************************************/