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| 1 |
| 2 |
| 3 /** |
| 4 * `iron-range-behavior` provides the behavior for something with a minimum to m
aximum range. |
| 5 * |
| 6 * @demo demo/index.html |
| 7 * @polymerBehavior |
| 8 */ |
| 9 Polymer.IronRangeBehavior = { |
| 10 |
| 11 properties: { |
| 12 |
| 13 /** |
| 14 * The number that represents the current value. |
| 15 */ |
| 16 value: { |
| 17 type: Number, |
| 18 value: 0, |
| 19 notify: true, |
| 20 reflectToAttribute: true |
| 21 }, |
| 22 |
| 23 /** |
| 24 * The number that indicates the minimum value of the range. |
| 25 */ |
| 26 min: { |
| 27 type: Number, |
| 28 value: 0, |
| 29 notify: true |
| 30 }, |
| 31 |
| 32 /** |
| 33 * The number that indicates the maximum value of the range. |
| 34 */ |
| 35 max: { |
| 36 type: Number, |
| 37 value: 100, |
| 38 notify: true |
| 39 }, |
| 40 |
| 41 /** |
| 42 * Specifies the value granularity of the range's value. |
| 43 */ |
| 44 step: { |
| 45 type: Number, |
| 46 value: 1, |
| 47 notify: true |
| 48 }, |
| 49 |
| 50 /** |
| 51 * Returns the ratio of the value. |
| 52 */ |
| 53 ratio: { |
| 54 type: Number, |
| 55 value: 0, |
| 56 readOnly: true, |
| 57 notify: true |
| 58 }, |
| 59 }, |
| 60 |
| 61 observers: [ |
| 62 '_update(value, min, max, step)' |
| 63 ], |
| 64 |
| 65 _calcRatio: function(value) { |
| 66 return (this._clampValue(value) - this.min) / (this.max - this.min); |
| 67 }, |
| 68 |
| 69 _clampValue: function(value) { |
| 70 return Math.min(this.max, Math.max(this.min, this._calcStep(value))); |
| 71 }, |
| 72 |
| 73 _calcStep: function(value) { |
| 74 return this.step ? (Math.round(value / this.step) / (1 / this.step)) : value
; |
| 75 }, |
| 76 |
| 77 _validateValue: function() { |
| 78 var v = this._clampValue(this.value); |
| 79 this.value = this.oldValue = isNaN(v) ? this.oldValue : v; |
| 80 return this.value !== v; |
| 81 }, |
| 82 |
| 83 _update: function() { |
| 84 this._validateValue(); |
| 85 this._setRatio(this._calcRatio(this.value) * 100); |
| 86 } |
| 87 |
| 88 }; |
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