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Issue 1158973006: Rolling forward https://codereview.chromium.org/1155683008/ which was (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: missed one commit from the old cl Created 5 years, 6 months ago
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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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