SGH / COMPONENTS

  <!--

  @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
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  <link rel="import" href="../polymer/polymer.html">

  <link rel="import" href="../paper-behaviors/paper-checked-element-behavior.html">

  <link rel="import" href="../paper-ripple/paper-ripple.html">
  <link rel="import" href="../paper-styles/default-theme.html">

  
  <!--

  Material design: [Radio button](https://www.google.com/design/spec/components/selection-controls.html#selection-controls-radio-button)
  

  `paper-radio-button` is a button that can be either checked or unchecked.
  User can tap the radio button to check or uncheck it.
  
  Use a `<paper-radio-group>` to group a set of radio buttons.  When radio buttons
  are inside a radio group, exactly one radio button in the group can be checked
  at any time.
  
  Example:
  
      <paper-radio-button></paper-radio-button>
      <paper-radio-button>Item label</paper-radio-button>
  
  ### Styling
  
  The following custom properties and mixins are available for styling:
  
  Custom property | Description | Default
  ----------------|-------------|----------
  `--paper-radio-button-unchecked-background-color` | Radio button background color when the input is not checked | `transparent`
  `--paper-radio-button-unchecked-color` | Radio button color when the input is not checked | `--primary-text-color`
  `--paper-radio-button-unchecked-ink-color` | Selected/focus ripple color when the input is not checked | `--primary-text-color`
  `--paper-radio-button-checked-color` | Radio button color when the input is checked | `--default-primary-color`
  `--paper-radio-button-checked-ink-color` | Selected/focus ripple color when the input is checked | `--default-primary-color`
  `--paper-radio-button-label-color` | Label color | `--primary-text-color`

  `--paper-radio-button-label-spacing` | Spacing between the label and the button | `10px`

  
  @group Paper Elements
  @element paper-radio-button
  @hero hero.svg
  @demo demo/index.html
  -->
  
  <dom-module id="paper-radio-button">

    <template strip-whitespace>

      <style>
        :host {
          display: inline-block;
          white-space: nowrap;
        }

        :host(:focus) {
          outline: none;
        }

        #radioContainer {
          display: inline-block;
          position: relative;
          width: 16px;
          height: 16px;
          cursor: pointer;
          vertical-align: middle;
        }
  

        #ink {

          position: absolute;
          top: -16px;
          left: -16px;
          width: 48px;
          height: 48px;
          color: var(--paper-radio-button-unchecked-ink-color, --primary-text-color);
          opacity: 0.6;
          pointer-events: none;
        }
  

        :host-context([dir="rtl"]) #ink {
          right: -15px;
          left: auto;
        }
  
        #ink[checked] {

          color: var(--paper-radio-button-checked-ink-color, --default-primary-color);
        }
  

        #offRadio {

          position: absolute;
          box-sizing: content-box;
          top: 0px;
          left: 0px;

          right: 0px;

          width: 12px;
          height: 12px;
          border-radius: 50%;
          border: solid 2px;
          background-color: var(--paper-radio-button-unchecked-background-color, transparent);
          border-color: var(--paper-radio-button-unchecked-color, --primary-text-color);
          transition: border-color 0.28s;
        }
  

        #onRadio {

          position: absolute;
          box-sizing: content-box;
          top: 4px;
          left: 4px;

          right: 4px;

          width: 8px;
          height: 8px;
          border-radius: 50%;
          background-color: var(--paper-radio-button-checked-color, --default-primary-color);
          -webkit-transform: scale(0);
          transform: scale(0);
          transition: -webkit-transform ease 0.28s;
          transition: transform ease 0.28s;
        }
  
        :host([checked]) #offRadio {
          border-color: var(--paper-radio-button-checked-color, --default-primary-color);
        }
  
        :host([checked]) #onRadio {
          -webkit-transform: scale(1);
          transform: scale(1);
        }
  
        #radioLabel {
          position: relative;
          display: inline-block;
          vertical-align: middle;

          margin-left: var(--paper-radio-button-label-spacing, 10px);

          white-space: normal;
          pointer-events: none;
          color: var(--paper-radio-button-label-color, --primary-text-color);
        }
  

        :host-context([dir="rtl"]) #radioLabel {
          margin-left: 0px;
          margin-right: var(--paper-radio-button-label-spacing, 10px);
        }
  

        #radioLabel[hidden] {
          display: none;
        }
  
        /* disabled state */
        :host([disabled]) {
          pointer-events: none;
        }
  
        :host([disabled]) #offRadio {
          border-color: var(--paper-radio-button-unchecked-color, --primary-text-color);
          opacity: 0.5;
        }
  
        :host([disabled][checked]) #onRadio {
          background-color: var(--paper-radio-button-unchecked-color, --primary-text-color);
          opacity: 0.5;
        }
  
        :host([disabled]) #radioLabel {
          /* slightly darker than the button, so that it's readable */
          opacity: 0.65;
        }
      </style>

  
      <div id="radioContainer">
        <div id="offRadio"></div>
        <div id="onRadio"></div>

      </div>
  

      <div id="radioLabel"><content></content></div>

    </template>
  
    <script>
      Polymer({
        is: 'paper-radio-button',
  
        behaviors: [

          Polymer.PaperCheckedElementBehavior

        ],
  
        hostAttributes: {
          role: 'radio',
          'aria-checked': false,
          tabindex: 0
        },
  
        properties: {
          /**
           * Fired when the checked state changes due to user interaction.
           *
           * @event change
           */
  
          /**
           * Fired when the checked state changes.
           *
           * @event iron-change
           */
  

          ariaActiveAttribute: {
            type: String,
            value: 'aria-checked'

          }
        },
  

        // create the element ripple inside the `radioContainer`
        _createRipple: function() {
          this._rippleContainer = this.$.radioContainer;
          return Polymer.PaperInkyFocusBehaviorImpl._createRipple.call(this);

        }
      })
    </script>

  </dom-module>