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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 |
| 13 <script> |
| 14 |
| 15 /** |
| 16 * `iron-range-behavior` provides the behavior for something with a minimum to m
aximum range. |
| 17 * |
| 18 * @demo demo/index.html |
| 19 * @polymerBehavior |
| 20 */ |
| 21 Polymer.IronRangeBehavior = { |
| 22 |
| 23 properties: { |
| 24 |
| 25 /** |
| 26 * The number that represents the current value. |
| 27 */ |
| 28 value: { |
| 29 type: Number, |
| 30 value: 0, |
| 31 notify: true, |
| 32 reflectToAttribute: true |
| 33 }, |
| 34 |
| 35 /** |
| 36 * The number that indicates the minimum value of the range. |
| 37 */ |
| 38 min: { |
| 39 type: Number, |
| 40 value: 0, |
| 41 notify: true |
| 42 }, |
| 43 |
| 44 /** |
| 45 * The number that indicates the maximum value of the range. |
| 46 */ |
| 47 max: { |
| 48 type: Number, |
| 49 value: 100, |
| 50 notify: true |
| 51 }, |
| 52 |
| 53 /** |
| 54 * Specifies the value granularity of the range's value. |
| 55 */ |
| 56 step: { |
| 57 type: Number, |
| 58 value: 1, |
| 59 notify: true |
| 60 }, |
| 61 |
| 62 /** |
| 63 * Returns the ratio of the value. |
| 64 */ |
| 65 ratio: { |
| 66 type: Number, |
| 67 value: 0, |
| 68 readOnly: true, |
| 69 notify: true |
| 70 }, |
| 71 }, |
| 72 |
| 73 observers: [ |
| 74 '_update(value, min, max, step)' |
| 75 ], |
| 76 |
| 77 _calcRatio: function(value) { |
| 78 return (this._clampValue(value) - this.min) / (this.max - this.min); |
| 79 }, |
| 80 |
| 81 _clampValue: function(value) { |
| 82 return Math.min(this.max, Math.max(this.min, this._calcStep(value))); |
| 83 }, |
| 84 |
| 85 _calcStep: function(value) { |
| 86 return this.step ? (Math.round(value / this.step) / (1 / this.step)) : value
; |
| 87 }, |
| 88 |
| 89 _validateValue: function() { |
| 90 var v = this._clampValue(this.value); |
| 91 this.value = this.oldValue = isNaN(v) ? this.oldValue : v; |
| 92 return this.value !== v; |
| 93 }, |
| 94 |
| 95 _update: function() { |
| 96 this._validateValue(); |
| 97 this._setRatio(this._calcRatio(this.value) * 100); |
| 98 } |
| 99 |
| 100 }; |
| 101 </script> |
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