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1 | |
2 Polymer({ | |
3 is: 'paper-toggle-button', | |
4 | |
5 behaviors: [ | |
6 Polymer.PaperRadioButtonBehavior | |
7 ], | |
8 | |
9 hostAttributes: { | |
10 role: 'button', | |
11 'aria-pressed': 'false', | |
12 tabindex: 0 | |
13 }, | |
14 | |
15 properties: { | |
16 /** | |
17 * Fired when the checked state changes due to user interaction. | |
18 * | |
19 * @event change | |
20 */ | |
21 /** | |
22 * Fired when the checked state changes. | |
23 * | |
24 * @event iron-change | |
25 */ | |
26 /** | |
27 * Gets or sets the state, `true` is checked and `false` is unchecked. | |
28 * | |
29 * @attribute checked | |
30 * @type boolean | |
31 * @default false | |
32 */ | |
33 checked: { | |
34 type: Boolean, | |
35 value: false, | |
36 reflectToAttribute: true, | |
37 notify: true, | |
38 observer: '_checkedChanged' | |
39 }, | |
40 | |
41 /** | |
42 * If true, the button toggles the active state with each tap or press | |
43 * of the spacebar. | |
44 * | |
45 * @attribute toggles | |
46 * @type boolean | |
47 * @default true | |
48 */ | |
49 toggles: { | |
50 type: Boolean, | |
51 value: true, | |
52 reflectToAttribute: true | |
53 } | |
54 }, | |
55 | |
56 listeners: { | |
57 track: '_ontrack' | |
58 }, | |
59 | |
60 ready: function() { | |
61 this._isReady = true; | |
62 }, | |
63 | |
64 // button-behavior hook | |
65 _buttonStateChanged: function() { | |
66 if (this.disabled) { | |
67 return; | |
68 } | |
69 if (this._isReady) { | |
70 this.checked = this.active; | |
71 } | |
72 }, | |
73 | |
74 _checkedChanged: function(checked) { | |
75 this.active = this.checked; | |
76 this.fire('iron-change'); | |
77 }, | |
78 | |
79 _ontrack: function(event) { | |
80 var track = event.detail; | |
81 if (track.state === 'start') { | |
82 this._trackStart(track); | |
83 } else if (track.state === 'track') { | |
84 this._trackMove(track); | |
85 } else if (track.state === 'end') { | |
86 this._trackEnd(track); | |
87 } | |
88 }, | |
89 | |
90 _trackStart: function(track) { | |
91 this._width = this.$.toggleBar.offsetWidth / 2; | |
92 /* | |
93 * keep an track-only check state to keep the dragging behavior smooth | |
94 * while toggling activations | |
95 */ | |
96 this._trackChecked = this.checked; | |
97 this.$.toggleButton.classList.add('dragging'); | |
98 }, | |
99 | |
100 _trackMove: function(track) { | |
101 var dx = track.dx; | |
102 this._x = Math.min(this._width, | |
103 Math.max(0, this._trackChecked ? this._width + dx : dx)); | |
104 this.translate3d(this._x + 'px', 0, 0, this.$.toggleButton); | |
105 this._userActivate(this._x > (this._width / 2)); | |
106 }, | |
107 | |
108 _trackEnd: function(track) { | |
109 this.$.toggleButton.classList.remove('dragging'); | |
110 this.transform('', this.$.toggleButton); | |
111 } | |
112 | |
113 }); | |
114 | |
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