performance-art.fr/sites/all/modules/gui/jqplug/js/ui/effects.bounce.js

/*
 * jQuery UI Effects Bounce 1.7.2
 *
 * Copyright (c) 2009 AUTHORS.txt (http://jqueryui.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Effects/Bounce
 *
 * Depends:
 *	effects.core.js
 */
(function($) {

$.effects.bounce = function(o) {

	return this.queue(function() {

		// Create element
		var el = $(this), props = ['position','top','left'];

		// Set options
		var mode = $.effects.setMode(el, o.options.mode || 'effect'); // Set Mode
		var direction = o.options.direction || 'up'; // Default direction
		var distance = o.options.distance || 20; // Default distance
		var times = o.options.times || 5; // Default # of times
		var speed = o.duration || 250; // Default speed per bounce
		if (/show|hide/.test(mode)) props.push('opacity'); // Avoid touching opacity to prevent clearType and PNG issues in IE

		// 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}) / 3 : el.outerWidth({margin:true}) / 3);
		if (mode == 'show') el.css('opacity', 0).css(ref, motion == 'pos' ? -distance : distance); // Shift
		if (mode == 'hide') distance = distance / (times * 2);
		if (mode != 'hide') times--;

		// Animate
		if (mode == 'show') { // Show Bounce
			var animation = {opacity: 1};
			animation[ref] = (motion == 'pos' ? '+=' : '-=') + distance;
			el.animate(animation, speed / 2, o.options.easing);
			distance = distance / 2;
			times--;
		};
		for (var i = 0; i < times; i++) { // Bounces
			var animation1 = {}, animation2 = {};
			animation1[ref] = (motion == 'pos' ? '-=' : '+=') + distance;
			animation2[ref] = (motion == 'pos' ? '+=' : '-=') + distance;
			el.animate(animation1, speed / 2, o.options.easing).animate(animation2, speed / 2, o.options.easing);
			distance = (mode == 'hide') ? distance * 2 : distance / 2;
		};
		if (mode == 'hide') { // Last Bounce
			var animation = {opacity: 0};
			animation[ref] = (motion == 'pos' ? '-=' : '+=')  + distance;
			el.animate(animation, speed / 2, o.options.easing, function(){
				el.hide(); // Hide
				$.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
				if(o.callback) o.callback.apply(this, arguments); // Callback
			});
		} else {
			var animation1 = {}, animation2 = {};
			animation1[ref] = (motion == 'pos' ? '-=' : '+=') + distance;
			animation2[ref] = (motion == 'pos' ? '+=' : '-=') + distance;
			el.animate(animation1, speed / 2, o.options.easing).animate(animation2, speed / 2, o.options.easing, function(){
				$.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
				if(o.callback) o.callback.apply(this, arguments); // Callback
			});
		};
		el.queue('fx', function() { el.dequeue(); });
		el.dequeue();
	});

};

})(jQuery);