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| 1 | |
| 2 | |
| 3 Polymer.IronButtonState = { | |
| 4 | |
| 5 properties: { | |
| 6 | |
| 7 /** | |
| 8 * If true, the user is currently holding down the button. | |
| 9 * | |
| 10 * @attribute pressed | |
| 11 * @type boolean | |
| 12 * @default false | |
| 13 */ | |
| 14 pressed: { | |
| 15 type: Boolean, | |
| 16 readOnly: true, | |
| 17 reflectToAttribute: true, | |
| 18 observer: '_pressedChanged' | |
| 19 }, | |
| 20 | |
| 21 /** | |
| 22 * If true, the button toggles the active state with each tap or press | |
| 23 * of the spacebar. | |
| 24 * | |
| 25 * @attribute toggles | |
| 26 * @type boolean | |
| 27 * @default false | |
| 28 */ | |
| 29 toggles: { | |
| 30 type: Boolean, | |
| 31 reflectToAttribute: true | |
| 32 }, | |
| 33 | |
| 34 /** | |
| 35 * If true, the button is a toggle and is currently in the active state. | |
| 36 * | |
| 37 * @attribute active | |
| 38 * @type boolean | |
| 39 * @default false | |
| 40 */ | |
| 41 active: { | |
| 42 type: Boolean, | |
| 43 notify: true, | |
| 44 reflectToAttribute: true, | |
| 45 observer: '_activeChanged' | |
| 46 } | |
| 47 | |
| 48 }, | |
| 49 | |
| 50 listeners: { | |
| 51 mousedown: '_downHandler', | |
| 52 mouseup: '_upHandler', | |
| 53 keydown: '_keyDownHandler', | |
| 54 keyup: '_keyUpHandler', | |
| 55 tap: '_tapHandler' | |
| 56 }, | |
| 57 | |
| 58 _tapHandler: function() { | |
| 59 if (this.toggles) { | |
| 60 // a tap is needed to toggle the active state | |
| 61 this._userActivate(!this.active); | |
| 62 } else { | |
| 63 this.active = false; | |
| 64 } | |
| 65 }, | |
| 66 | |
| 67 // to emulate native checkbox, (de-)activations from a user interaction fire | |
| 68 // 'change' events | |
| 69 _userActivate: function(active) { | |
| 70 this.active = active; | |
| 71 this.fire('change'); | |
| 72 }, | |
| 73 | |
| 74 _downHandler: function() { | |
| 75 this._setPressed(true); | |
| 76 }, | |
| 77 | |
| 78 _upHandler: function(e) { | |
| 79 this._setPressed(false); | |
| 80 }, | |
| 81 | |
| 82 _keyDownHandler: function(e) { | |
| 83 switch(e.keyCode) { | |
| 84 case this.keyCodes.ENTER_KEY: | |
| 85 this._asyncClick(); | |
| 86 break; | |
| 87 | |
| 88 case this.keyCodes.SPACE: | |
| 89 this._setPressed(true); | |
| 90 break; | |
| 91 | |
| 92 } | |
| 93 }, | |
| 94 | |
| 95 _keyUpHandler: function(e) { | |
| 96 if (e.keyCode == this.keyCodes.SPACE) { | |
| 97 if (this.pressed) { | |
| 98 this._asyncClick(); | |
| 99 } | |
| 100 this._setPressed(false); | |
| 101 } | |
| 102 }, | |
| 103 | |
| 104 // trigger click asynchronously, the asynchrony is useful to allow one | |
| 105 // event handler to unwind before triggering another event | |
| 106 _asyncClick: function() { | |
| 107 this.async(function() { | |
| 108 this.click(); | |
| 109 }, 1); | |
| 110 }, | |
| 111 | |
| 112 // any of these changes are considered a change to button state | |
| 113 | |
| 114 _pressedChanged: function(pressed) { | |
| 115 this._changedButtonState(); | |
| 116 }, | |
| 117 | |
| 118 _activeChanged: function(active) { | |
| 119 this.setAttribute('aria-pressed', active ? 'true' : 'false'); | |
| 120 this._changedButtonState(); | |
| 121 }, | |
| 122 | |
| 123 _controlStateChanged: function() { | |
| 124 if (this.disabled) { | |
| 125 this._setPressed(false); | |
| 126 this.active = false; | |
| 127 } else { | |
| 128 this._changedButtonState(); | |
| 129 } | |
| 130 }, | |
| 131 | |
| 132 // provide hook for follow-on behaviors to react to button-state | |
| 133 | |
| 134 _changedButtonState: function() { | |
| 135 if (this._buttonStateChanged) { | |
| 136 this._buttonStateChanged(); // abstract | |
| 137 } | |
| 138 } | |
| 139 | |
| 140 }; | |
| 141 | |
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Chromium Code Reviews
Issue 1124053009:
Pull latest Polymer elements (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master