/*
 * jQuery UI Effects Drop @VERSION
 *
 * Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 * http://jquery.org/license
 *
 * http://docs.jquery.com/UI/Effects/Drop
 *
 * Depends:
 *	jquery.effects.core.js
 */
(function( $, undefined ) {

$.effects.drop = function(o) {

	return this.queue(function() {

		// Create element
		var el = $( this ), 
			props = ['position','top','bottom','left','right','opacity'],
			mode = $.effects.setMode(el, o.mode || 'hide'),
			direction = o.direction || 'left'; // Default Direction

		// Adjust
		$.effects.save(el, props); el.show(); // Save & Show
		$.effects.createWrapper(el); // Create Wrapper
		var ref = (direction == 'up' || direction == 'down') ? 'top' : 'left';
		var motion = (direction == 'up' || direction == 'left') ? 'pos' : 'neg';
		var distance = o.distance || (ref == 'top' ? el.outerHeight({margin:true}) / 2 : el.outerWidth({margin:true}) / 2);
		if (mode == 'show') el.css('opacity', 0).css(ref, motion == 'pos' ? -distance : distance); // Shift

		// Animation
		var animation = {opacity: mode == 'show' ? 1 : 0};
		animation[ref] = (mode == 'show' ? (motion == 'pos' ? '+=' : '-=') : (motion == 'pos' ? '-=' : '+=')) + distance;

		// Animate
		el.animate(animation, { queue: false, duration: o.duration, easing: o.easing, complete: function() {
			if(mode == 'hide') el.hide(); // Hide
			$.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
			if(o.complete) o.complete.apply(this, arguments); // Callback
			el.dequeue();
		}});

	});

};

})(jQuery);