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/*
* Material Experience - Document Overlay Class
*
* EYEMG - Interactive Media Group
* Created by Mike Crute (mcrute@eyemg.com)
* Updated by Mike Crute (mcrute@eyemg.com) on 9/26/07
*/
var Overlay = Class.create();
Object.extend(Overlay.prototype,
{
/*
* Initializes the overlay class
*/
initialize: function()
{
this.options = Object.extend(
{
zIndex: 9000, // z-index of the overlay
background: 'white', // Overlay color
opacity: 0.5, // Overlay opacity
fadeInSpeed: 0.2, // Fade in speed
fadeOutSpeed: 1, // Fade out speed
onClick: this.hide, // Callback for overlay click
onShow: Prototype.emptyFunction, // Callback when the overlay is shown
onHide: Prototype.emptyFunction // Callback when the overlay is hidden
}, $H(arguments[0]) || {});
this._createOverlay();
},
/*
* Creates the actual DOM elements of the overlay.
*/
_createOverlay: function()
{
this.overlay = Element.extend(document.createElement('div'));
document.body.appendChild(this.overlay);
Event.observe(this.overlay, 'click', this.options.onClick.bindAsEventListener(this));
this.overlay.setStyle(
{
backgroundColor: this.options.background,
zIndex: this.options.zIndex,
height: '100%',
width: '100%',
position: 'absolute',
display: 'none',
top: 0,
left: 0
});
},
/*
* Displays the overlay.
*/
show: function()
{
this._fixBody();
this.options.onShow(this);
new Effect.Appear(this.overlay,
{
to: this.options.opacity,
duration: this.options.fadeInSpeed,
limit: 1
});
},
/*
* Hides the overlay.
*/
hide: function()
{
this.options.onHide(this);
new Effect.Fade(this.overlay,
{
duration: this.options.fadeOutSpeed,
limit: 1,
afterFinish: function()
{
this._fixBody(true);
}.bind(this)
});
},
/*
* Removes the overlay from the DOM
*/
destroy: function()
{
document.body.removeChild(this.overlay);
},
/*
* Fix for IE 6, sets the body height and overflow so people can not
* scroll beyond the overlay. Disable overflow on the body and html
* so you can see the whole overlay.
*/
_fixBody: function(reset)
{
var myHeight = reset ? '' : '100%';
var myOverflow = reset ? '' : 'hidden';
$A([document.body,document.getElementsByTagName('html')[0]]).each(function(t)
{
Element.extend(t).setStyle(
{
height: myHeight,
overflow: myOverflow
});
});
}
});
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