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      1 <!--
      2 Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
      3 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
      4 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
      5 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
      6 Code distributed by Google as part of the polymer project is also
      7 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
      8 -->
      9 
     10 <!--
     11 `paper-toggle-button` provides a ON/OFF switch that user can toggle the state
     12 by tapping or by dragging the swtich.
     13 
     14 Example:
     15 
     16     <paper-toggle-button></paper-toggle-button>
     17 
     18 Styling toggle button:
     19 
     20 To change the ink color for checked state:
     21 
     22     paper-toggle-button::shadow paper-radio-button::shadow #ink[checked] {
     23       color: #4285f4;
     24     }
     25     
     26 To change the radio checked color:
     27     
     28     paper-toggle-button::shadow paper-radio-button::shadow #onRadio {
     29       background-color: #4285f4;
     30     }
     31     
     32 To change the bar color for checked state:
     33 
     34     paper-toggle-button::shadow #toggleBar[checked] {
     35       background-color: #4285f4;
     36     }
     37     
     38 To change the ink color for unchecked state:
     39 
     40     paper-toggle-button::shadow paper-radio-button::shadow #ink {
     41       color: #b5b5b5;
     42     }
     43     
     44 To change the radio unchecked color:
     45     
     46     paper-toggle-button::shadow paper-radio-button::shadow #offRadio {
     47       border-color: #b5b5b5;
     48     }
     49 
     50 To change the bar color for unchecked state:
     51 
     52     paper-toggle-button::shadow #toggleBar {
     53       background-color: red;
     54     }
     55 
     56 @group Paper Elements
     57 @element paper-toggle-button
     58 @homepage github.io
     59 -->
     60 
     61 <link rel="import" href="../paper-radio-button/paper-radio-button.html">
     62 
     63 <polymer-element name="paper-toggle-button" attributes="checked" role="button" aria-pressed="false" tabindex="0">
     64 <template>
     65 
     66   <link rel="stylesheet" href="paper-toggle-button.css">
     67 
     68   <div id="toggleContainer">
     69   
     70     <div id="toggleBar" checked?="{{checked}}"></div>
     71   
     72     <paper-radio-button id="toggleRadio" toggles checked="{{checked}}"
     73         on-trackstart="{{trackStart}}" on-trackx="{{trackx}}" on-trackend="{{trackEnd}}"></paper-radio-button>
     74     
     75   </div>
     76 
     77 </template>
     78 <script>
     79 
     80   Polymer('paper-toggle-button', {
     81     
     82     /**
     83      * Fired when the checked state changes.
     84      *
     85      * @event change
     86      */
     87 
     88     /**
     89      * Gets or sets the state, `true` is checked and `false` is unchecked.
     90      *
     91      * @attribute checked
     92      * @type boolean
     93      * @default false
     94      */
     95     checked: false,
     96 
     97     trackStart: function(e) {
     98       this._w = this.$.toggleBar.offsetLeft + this.$.toggleBar.offsetWidth;
     99       e.preventTap();
    100     },
    101 
    102     trackx: function(e) {
    103       this._x = Math.min(this._w, 
    104           Math.max(0, this.checked ? this._w + e.dx : e.dx));
    105       this.$.toggleRadio.classList.add('dragging');
    106       var s =  this.$.toggleRadio.style;
    107       s.webkitTransform = s.transform = 'translate3d(' + this._x + 'px,0,0)';
    108     },
    109 
    110     trackEnd: function() {
    111       var s =  this.$.toggleRadio.style;
    112       s.webkitTransform = s.transform = null;
    113       this.$.toggleRadio.classList.remove('dragging');
    114       this.checked = Math.abs(this._x) > this._w / 2;
    115     },
    116 
    117     checkedChanged: function() {
    118       this.setAttribute('aria-pressed', Boolean(this.checked));
    119       this.fire('change');
    120     }
    121 
    122   });
    123 
    124 </script>
    125 </polymer-element>
    126