SGH / COMPONENTS

Blame view

bower_components/iron-range-behavior/iron-range-behavior.html 2.62 KB
Edit Raw Normal View History
73bcce88   luigser   COMPONENTS 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
  <!--
  @license
  Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
  This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
  The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
  The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
  Code distributed by Google as part of the polymer project is also
  subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  -->
  
  <link rel="import" href="../polymer/polymer.html">
  
  <script>
eb240478   Luigi Serra   public room cards... 
15
 
   /**
73bcce88   luigser   COMPONENTS 
16
17
18
 
   * `iron-range-behavior` provides the behavior for something with a minimum to maximum range.
   *
   * @demo demo/index.html
eb240478   Luigi Serra   public room cards... 
19
 
   * @polymerBehavior
73bcce88   luigser   COMPONENTS 
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
 
   */
   Polymer.IronRangeBehavior = {
  
    properties: {
  
      /**
       * The number that represents the current value.
       */
      value: {
        type: Number,
        value: 0,
        notify: true,
        reflectToAttribute: true
      },
  
      /**
       * The number that indicates the minimum value of the range.
       */
      min: {
        type: Number,
        value: 0,
        notify: true
      },
  
      /**
       * The number that indicates the maximum value of the range.
       */
      max: {
        type: Number,
        value: 100,
        notify: true
      },
  
      /**
       * Specifies the value granularity of the range's value.
       */
      step: {
        type: Number,
        value: 1,
        notify: true
      },
  
      /**
       * Returns the ratio of the value.
       */
      ratio: {
        type: Number,
        value: 0,
        readOnly: true,
        notify: true
      },
    },
  
    observers: [
      '_update(value, min, max, step)'
    ],
  
    _calcRatio: function(value) {
      return (this._clampValue(value) - this.min) / (this.max - this.min);
    },
  
    _clampValue: function(value) {
      return Math.min(this.max, Math.max(this.min, this._calcStep(value)));
    },
  
    _calcStep: function(value) {
     /**
      * if we calculate the step using
eb240478   Luigi Serra   public room cards... 
88
 
      * `Math.round(value / step) * step` we may hit a precision point issue
73bcce88   luigser   COMPONENTS 
89
90
91
92
93
 
      * eg. 0.1 * 0.2 =  0.020000000000000004
      * http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
      *
      * as a work around we can divide by the reciprocal of `step`
      */
e619a3b0   Luigi Serra   Controllet cross ... 
94
95
 
      // polymer/issues/2493
      value = parseFloat(value);
eb240478   Luigi Serra   public room cards... 
96
97
 
      return this.step ? (Math.round((value + this.min) / this.step) -
          (this.min / this.step)) / (1 / this.step) : value;
73bcce88   luigser   COMPONENTS 
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
 
    },
  
    _validateValue: function() {
      var v = this._clampValue(this.value);
      this.value = this.oldValue = isNaN(v) ? this.oldValue : v;
      return this.value !== v;
    },
  
    _update: function() {
      this._validateValue();
      this._setRatio(this._calcRatio(this.value) * 100);
    }
  
  };
  </script>