WordPress源代码——jquery-ui（1.8.20——jquery.effects.bounce.js）

1	/*!
2	 * jQuery UI Effects Bounce @VERSION
3	 *
4	 * Copyright 2012, AUTHORS.txt (http://jqueryui.com/about)
5	 * Dual licensed under the MIT or GPL Version 2 licenses.
6	 * http://jquery.org/license
7	 *
8	 * http://docs.jquery.com/UI/Effects/Bounce
9	 *
10	 * Depends:
11	 *      jquery.effects.core.js
12	 */
13	(function( $, undefined ) {
14	
15	$.effects.bounce = function(o) {
16	
17	        return this.queue(function() {
18	
19	                // Create element
20	                var el = $(this), props = ['position','top','bottom','left','right'];
21	
22	                // Set options
23	                var mode = $.effects.setMode(el, o.options.mode || 'effect'); // Set Mode
24	                var direction = o.options.direction || 'up'; // Default direction
25	                var distance = o.options.distance || 20; // Default distance
26	                var times = o.options.times || 5; // Default # of times
27	                var speed = o.duration || 250; // Default speed per bounce
28	                if (/show|hide/.test(mode)) props.push('opacity'); // Avoid touching opacity to prevent clearType and PNG issues in IE
29	
30	                // Adjust
31	                $.effects.save(el, props); el.show(); // Save & Show
32	                $.effects.createWrapper(el); // Create Wrapper
33	                var ref = (direction == 'up' || direction == 'down') ? 'top' : 'left';
34	                var motion = (direction == 'up' || direction == 'left') ? 'pos' : 'neg';
35	                var distance = o.options.distance || (ref == 'top' ? el.outerHeight({margin:true}) / 3 : el.outerWidth({margin:true}) / 3);
36	                if (mode == 'show') el.css('opacity', 0).css(ref, motion == 'pos' ? -distance : distance); // Shift
37	                if (mode == 'hide') distance = distance / (times * 2);
38	                if (mode != 'hide') times--;
39	
40	                // Animate
41	                if (mode == 'show') { // Show Bounce
42	                        var animation = {opacity: 1};
43	                        animation[ref] = (motion == 'pos' ? '+=' : '-=') + distance;
44	                        el.animate(animation, speed / 2, o.options.easing);
45	                        distance = distance / 2;
46	                        times--;
47	                };
48	                for (var i = 0; i < times; i++) { // Bounces
49	                        var animation1 = {}, animation2 = {};
50	                        animation1[ref] = (motion == 'pos' ? '-=' : '+=') + distance;
51	                        animation2[ref] = (motion == 'pos' ? '+=' : '-=') + distance;
52	                        el.animate(animation1, speed / 2, o.options.easing).animate(animation2, speed / 2, o.options.easing);
53	                        distance = (mode == 'hide') ? distance * 2 : distance / 2;
54	                };
55	                if (mode == 'hide') { // Last Bounce
56	                        var animation = {opacity: 0};
57	                        animation[ref] = (motion == 'pos' ? '-=' : '+=')  + distance;
58	                        el.animate(animation, speed / 2, o.options.easing, function(){
59	                                el.hide(); // Hide
60	                                $.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
61	                                if(o.callback) o.callback.apply(this, arguments); // Callback
62	                        });
63	                } else {
64	                        var animation1 = {}, animation2 = {};
65	                        animation1[ref] = (motion == 'pos' ? '-=' : '+=') + distance;
66	                        animation2[ref] = (motion == 'pos' ? '+=' : '-=') + distance;
67	                        el.animate(animation1, speed / 2, o.options.easing).animate(animation2, speed / 2, o.options.easing, function(){
68	                                $.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
69	                                if(o.callback) o.callback.apply(this, arguments); // Callback
70	                        });
71	                };
72	                el.queue('fx', function() { el.dequeue(); });
73	                el.dequeue();
74	        });
75	
76	};
77	
78	})(jQuery);