source: branches/2.3/themes/default/js/ui/jquery.effects.drop.js @ 12526

/*
 * jQuery UI Effects Drop 1.8.16
 *
 * 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'];

                // Set options
                var mode = $.effects.setMode(el, o.options.mode || 'hide'); // Set Mode
                var direction = o.options.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.options.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.options.easing, complete: function() {
                        if(mode == 'hide') el.hide(); // Hide
                        $.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
                        if(o.callback) o.callback.apply(this, arguments); // Callback
                        el.dequeue();
                }});

        });

};

})(jQuery);