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1 | |
2 | |
3 (function() { | |
4 | |
5 'use strict'; | |
6 | |
7 function classNames(obj) { | |
8 var classNames = []; | |
9 for (var key in obj) { | |
10 if (obj.hasOwnProperty(key) && obj[key]) { | |
11 classNames.push(key); | |
12 } | |
13 } | |
14 | |
15 return classNames.join(' '); | |
16 } | |
17 | |
18 Polymer({ | |
19 | |
20 is: 'paper-spinner', | |
21 | |
22 listeners: { | |
23 'animationend': 'reset', | |
24 'webkitAnimationEnd': 'reset' | |
25 }, | |
26 | |
27 properties: { | |
28 | |
29 /** | |
30 * Displays the spinner. | |
31 * | |
32 * @attribute active | |
33 * @type boolean | |
34 * @default false | |
35 */ | |
36 active: { | |
37 observer: '_activeChanged', | |
38 type: Boolean, | |
39 value: false | |
40 }, | |
41 | |
42 /** | |
43 * Alternative text content for accessibility support. | |
44 * If alt is present, it will add an aria-label whose content matches
alt when active. | |
45 * If alt is not present, it will default to 'loading' as the alt valu
e. | |
46 * | |
47 * @attribute alt | |
48 * @type string | |
49 * @default 'loading' | |
50 */ | |
51 alt: { | |
52 observer: '_altChanged', | |
53 type: String, | |
54 value: 'loading' | |
55 }, | |
56 | |
57 /** | |
58 * True when the spinner is going from active to inactive. This is rep
resented by a fade | |
59 * to 0% opacity to the user. | |
60 */ | |
61 _coolingDown: { | |
62 type: Boolean, | |
63 value: false | |
64 }, | |
65 | |
66 _spinnerContainerClassName: { | |
67 type: String, | |
68 computed: '_computeSpinnerContainerClassName(active, _coolingDown)' | |
69 } | |
70 | |
71 }, | |
72 | |
73 _computeSpinnerContainerClassName: function(active, _coolingDown) { | |
74 return classNames({ | |
75 active: active || _coolingDown, | |
76 cooldown: _coolingDown | |
77 }); | |
78 }, | |
79 | |
80 ready: function() { | |
81 // Allow user-provided `aria-label` take preference to any other text
alternative. | |
82 if (this.hasAttribute('aria-label')) { | |
83 this.alt = this.getAttribute('aria-label'); | |
84 } else { | |
85 this.setAttribute('aria-label', this.alt); | |
86 } | |
87 | |
88 if (!this.active) { | |
89 this.setAttribute('aria-hidden', 'true'); | |
90 } | |
91 }, | |
92 | |
93 _activeChanged: function() { | |
94 if (this.active) { | |
95 this.removeAttribute('aria-hidden'); | |
96 } else { | |
97 this._coolingDown = true; | |
98 this.setAttribute('aria-hidden', 'true'); | |
99 } | |
100 }, | |
101 | |
102 _altChanged: function() { | |
103 if (this.alt === '') { | |
104 this.setAttribute('aria-hidden', 'true'); | |
105 } else { | |
106 this.removeAttribute('aria-hidden'); | |
107 } | |
108 | |
109 this.setAttribute('aria-label', this.alt); | |
110 }, | |
111 | |
112 reset: function() { | |
113 this.active = false; | |
114 this._coolingDown = false; | |
115 } | |
116 | |
117 }); | |
118 | |
119 }()); | |
120 | |
121 | |
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