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| 1 <!-- |
| 2 @license |
| 3 Copyright (c) 2015 The Polymer Project Authors. All rights reserved. |
| 4 This code may only be used under the BSD style license found at http://polymer.g
ithub.io/LICENSE.txt |
| 5 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt |
| 6 The complete set of contributors may be found at http://polymer.github.io/CONTRI
BUTORS.txt |
| 7 Code distributed by Google as part of the polymer project is also |
| 8 subject to an additional IP rights grant found at http://polymer.github.io/PATEN
TS.txt |
| 9 --> |
| 10 |
| 11 <link rel="import" href="../polymer/polymer.html"> |
| 12 <link rel="import" href="../iron-selector/iron-selectable.html"> |
| 13 <link rel="import" href="../paper-radio-button/paper-radio-button.html"> |
| 14 <link rel="import" href="../iron-a11y-keys-behavior/iron-a11y-keys-behavior.html
"> |
| 15 |
| 16 <!-- |
| 17 `paper-radio-group` allows user to select only one radio button from a set. |
| 18 Checking one radio button that belongs to a radio group unchecks any |
| 19 previously checked radio button within the same group. Use |
| 20 `selected` to get or set the selected radio button. |
| 21 |
| 22 Example: |
| 23 |
| 24 <paper-radio-group selected="small"> |
| 25 <paper-radio-button name="small">Small</paper-radio-button> |
| 26 <paper-radio-button name="medium">Medium</paper-radio-button> |
| 27 <paper-radio-button name="large">Large</paper-radio-button> |
| 28 </paper-radio-group> |
| 29 |
| 30 See <a href="paper-radio-button.html">paper-radio-button</a> for more |
| 31 information about `paper-radio-button`. |
| 32 |
| 33 @group Paper Elements |
| 34 @element paper-radio-group |
| 35 @hero hero.svg |
| 36 @demo demo/index.html |
| 37 --> |
| 38 |
| 39 <dom-module name="paper-radio-group"> |
| 40 <style> |
| 41 :host { |
| 42 display: inline-block; |
| 43 } |
| 44 |
| 45 :host ::content > * { |
| 46 padding: 12px; |
| 47 } |
| 48 </style> |
| 49 |
| 50 <template> |
| 51 <content id="items" select="*"></content> |
| 52 </template> |
| 53 |
| 54 </dom-module> |
| 55 |
| 56 <script> |
| 57 Polymer({ |
| 58 is: 'paper-radio-group', |
| 59 |
| 60 behaviors: [ |
| 61 Polymer.IronA11yKeysBehavior, |
| 62 Polymer.IronSelectableBehavior |
| 63 ], |
| 64 |
| 65 hostAttributes: { |
| 66 role: 'radiogroup', |
| 67 tabindex: 0 |
| 68 }, |
| 69 |
| 70 properties: { |
| 71 /** |
| 72 * Overriden from Polymer.IronSelectableBehavior |
| 73 */ |
| 74 attrForSelected: { |
| 75 type: String, |
| 76 value: 'name' |
| 77 }, |
| 78 |
| 79 /** |
| 80 * Overriden from Polymer.IronSelectableBehavior |
| 81 */ |
| 82 selectedAttribute: { |
| 83 type: String, |
| 84 value: 'checked' |
| 85 } |
| 86 }, |
| 87 |
| 88 keyBindings: { |
| 89 'left up': 'selectPrevious', |
| 90 'right down': 'selectNext', |
| 91 }, |
| 92 |
| 93 /** |
| 94 * Selects the given value. |
| 95 */ |
| 96 select: function(value) { |
| 97 if (this.selected) { |
| 98 var oldItem = this._valueToItem(this.selected); |
| 99 |
| 100 // Do not allow unchecking the selected item. |
| 101 if (this.selected == value) { |
| 102 oldItem.checked = true; |
| 103 return; |
| 104 } |
| 105 |
| 106 if (oldItem) |
| 107 oldItem.checked = false; |
| 108 } |
| 109 |
| 110 Polymer.IronSelectableBehavior.select.apply(this, [value]); |
| 111 this.fire('paper-radio-group-changed'); |
| 112 }, |
| 113 |
| 114 /** |
| 115 * Selects the previous item. If the previous item is disabled, then it is |
| 116 * skipped, and its previous item is selected |
| 117 */ |
| 118 selectPrevious: function() { |
| 119 var length = this.items.length; |
| 120 var newIndex = Number(this._valueToIndex(this.selected)); |
| 121 |
| 122 do { |
| 123 newIndex = (newIndex - 1 + length) % length; |
| 124 } while (this.items[newIndex].disabled) |
| 125 |
| 126 this.select(this._indexToValue(newIndex)); |
| 127 }, |
| 128 |
| 129 /** |
| 130 * Selects the next item. If the next item is disabled, then it is |
| 131 * skipped, and its nexy item is selected |
| 132 */ |
| 133 selectNext: function() { |
| 134 var length = this.items.length; |
| 135 var newIndex = Number(this._valueToIndex(this.selected)); |
| 136 |
| 137 do { |
| 138 newIndex = (newIndex + 1 + length) % length; |
| 139 } while (this.items[newIndex].disabled) |
| 140 |
| 141 this.select(this._indexToValue(newIndex)); |
| 142 }, |
| 143 }); |
| 144 </script> |
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