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110 lines
2.5 KiB
HTML
110 lines
2.5 KiB
HTML
<!--
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@license
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Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
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This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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Code distributed by Google as part of the polymer project is also
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subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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-->
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<link rel="import" href="../polymer/polymer.html">
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<script>
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/**
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* `iron-range-behavior` provides the behavior for something with a minimum to maximum range.
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*
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* @demo demo/index.html
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* @polymerBehavior
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*/
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Polymer.IronRangeBehavior = {
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properties: {
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/**
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* The number that represents the current value.
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*/
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value: {
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type: Number,
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value: 0,
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notify: true,
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reflectToAttribute: true
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},
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/**
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* The number that indicates the minimum value of the range.
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*/
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min: {
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type: Number,
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value: 0,
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notify: true
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},
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/**
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* The number that indicates the maximum value of the range.
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*/
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max: {
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type: Number,
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value: 100,
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notify: true
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},
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/**
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* Specifies the value granularity of the range's value.
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*/
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step: {
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type: Number,
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value: 1,
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notify: true
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},
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/**
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* Returns the ratio of the value.
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*/
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ratio: {
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type: Number,
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value: 0,
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readOnly: true,
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notify: true
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},
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},
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observers: [
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'_update(value, min, max, step)'
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],
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_calcRatio: function(value) {
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return (this._clampValue(value) - this.min) / (this.max - this.min);
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},
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_clampValue: function(value) {
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return Math.min(this.max, Math.max(this.min, this._calcStep(value)));
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},
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_calcStep: function(value) {
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/**
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* if we calculate the step using
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* `Math.round(value / step) * step` we may hit a precision point issue
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* eg. 0.1 * 0.2 = 0.020000000000000004
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* http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
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*
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* as a work around we can divide by the reciprocal of `step`
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*/
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return this.step ? (Math.round(value / this.step) / (1 / this.step)) : value;
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},
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_validateValue: function() {
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var v = this._clampValue(this.value);
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this.value = this.oldValue = isNaN(v) ? this.oldValue : v;
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return this.value !== v;
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},
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_update: function() {
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this._validateValue();
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this._setRatio(this._calcRatio(this.value) * 100);
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}
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};
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</script>
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