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

Script		: Overlay
Version		: 2.0.2
Authors		: Samuel Birch
Desc		: Covers the window with a semi-transparent layer.
Licence		: Open Source MIT Licence
Modified	: Liam Smart (liam_smart@hotmail.com) - MooTools 1.2 upgrade

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

//start overlay class
var Overlay = new Class({

	//implements
	Implements: Options,

	//options
	options: {
		colour: '#000', //background color of overlay
		opacity: 0.7, //opacity of overlay
		zIndex: 100, //the z-index of the overlay (needs to lower than multiBox pop-up)
		onClick: new Class()//make sure new class is loaded
	},

	//initialization
	initialize: function(options) {
		//set options
		this.setOptions(options);
		//start building overlay
		this.container = new Element('div', {
			'id': 'OverlayContainer',
			'styles': {
				position: 'absolute',
				left: 0,
				top: 0,
				width: '100%',
				visibility: 'hidden',
				overflow: 'hidden',
				zIndex: this.options.zIndex,
				opacity: 0
			}
		}).inject(this.options.container, 'inside');

		this.iframe = new Element('iframe', {
			'id': 'OverlayIframe',
			'name': 'OverlayIframe',
			'src': 'javascript:void(0);',
			'frameborder': 0,
			'scrolling': 'no',
			'styles': {
				position: 'absolute',
				top: 0,
				left: 0,
				width: '100%',
				height: '100%',
				filter: 'progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)',
				opacity: 0,
				zIndex: 101
			}
		}).inject(this.container, 'inside');

		this.overlay = new Element('div', {
			'id': 'Overlay',
			'styles': {
				position: 'absolute',
				left: 0,
				top: 0,
				width: '100%',
				height: '100%',
				zIndex: 102,
				backgroundColor: this.options.colour
			}
		}).inject(this.container, 'inside');

		this.container.addEvent('click', function() {
			this.options.onClick();
		} .bind(this));

		this.fade = new Fx.Morph(this.container);
		this.position();

		window.addEvent('resize', this.position.bind(this));
	},

	position: function() {
		if (this.options.container == document.body) {
			if (this.options.container.getHeight() >= this.options.container.getScrollHeight()) {
				this.container.setStyles({
					width: window.getWidth(),
					height: window.getHeight()
				});
			} else {
				this.container.setStyles({
					width: window.getWidth(),
					height: window.getScrollHeight()
				});
			};
		} else {
			var myCoords = this.options.container.getCoordinates();
			this.container.setStyles({
				top: myCoords.top,
				height: myCoords.height,
				left: myCoords.left,
				width: myCoords.width
			});
		};
	},

	show: function() {
		this.fade.start({
			visibility: 'visible',
			opacity: this.options.opacity
		}).chain(function() {
			visibility: 'hidden'
		});
	},

	hide: function() {
		this.fade.start({
			opacity: 0
		}).chain(function() {
			visibility: 'hidden'
		});
	}
});