chrome/browser/resources/settings/controls/controlled_radio_button.html

<link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
<link rel="import" href="chrome://resources/html/polymer.html">
<link rel="import" href="chrome://resources/polymer/v1_0/iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
<link rel="import" href="pref_control_behavior.html">
<link rel="import" href="../prefs/pref_util.html">
<link rel="import" href="../settings_shared_css.html">

<dom-module id="controlled-radio-button">
  <template>
    <style include="settings-shared">
      :host {
        --ink-to-circle: calc((var(--paper-radio-button-ink-size) -
                               var(--paper-radio-button-size)) / 2);
        @apply(--settings-actionable);
        align-items: center;
        display: flex;
        outline: none;
      }

      #labelWrapper {
        -webkit-margin-start: var(--paper-radio-button-label-spacing, 10px);
        flex: 1;
      }

      #label {
        color: var(--paper-radio-button-label-color, --primary-text-color);
      }

      .circle,
      .disc,
      .disc-wrapper,
      paper-ripple {
        border-radius: 50%;
      }

      .disc-wrapper {
        height: var(--paper-radio-button-ink-size);
        margin: 0 calc(-1 * var(--ink-to-circle));
        position: relative;
        width: var(--paper-radio-button-ink-size);
      }

      .circle,
      .disc {
        box-sizing: border-box;
        height: var(--paper-radio-button-size);
        left: var(--ink-to-circle);
        position: absolute;
        top: var(--ink-to-circle);
        width: var(--paper-radio-button-size);
      }

      .circle {
        border: 2px solid var(--paper-radio-button-unchecked-color,
                              --primary-text-color);
      }

      :host([checked]) .circle {
        border-color: var(--paper-radio-button-checked-color, --primary-color);
      }

      .disc {
        background-color: var(--paper-radio-button-unchecked-background-color,
                              transparent);
        transform: scale(0);
        transition: border-color 200ms, transform 200ms;
      }

      :host([checked]) .disc {
        background-color: var(--paper-radio-button-checked-color,
                              --primary-color);
        transform: scale(0.5);
      }

      paper-ripple {
        color: var(--paper-radio-button-unchecked-ink-color,
                   --primary-text-color);
        opacity: .6;
      }

      :host([checked]) paper-ripple {
        color: var(--paper-radio-button-checked-ink-color,
                   --primary-text-color);
      }

      :host(:not([controlled_])) {
        @apply(--settings-actionable);
      }

      :host([controlled_]) {
        /* Disable pointer events for this whole element, as outer on-tap gets
         * triggered when clicking/tapping anywhere in :host. */
        pointer-events: none;
      }

      :host([controlled_]) :-webkit-any(.circle, .disc) {
        opacity: .5;
      }

      :host([controlled_]) .circle {
        border-color: var(--paper-radio-button-unchecked-color,
                          --primary-text-color);
      }

      :host([controlled_][checked]) .disc {
        background-color: var(--paper-radio-button-unchecked-color,
                              --primary-text-color);
      }

      :host([controlled_]) #labelWrapper {
        opacity: .65;
      }

      cr-policy-pref-indicator {
        -webkit-margin-start: var(--settings-control-spacing);
        /* Enable pointer events for the indicator so :hover works. Disable
         * clicks/taps via onIndicatorTap_ so outer on-tap doesn't trigger. */
        pointer-events: all;
      }
    </style>

    <div class="disc-wrapper">
      <div class="circle"></div>
      <div class="disc"></div>
      <paper-ripple center hold-down="[[pressed_]]"></paper-ripple>
    </div>

    <div id="labelWrapper">
      <span id="label" hidden$="[[!label]]">[[label]]</span>
      <content></content>
    </div>

    <template is="dom-if" if="[[showIndicator_(controlled_, name, pref.*)]]">
      <cr-policy-pref-indicator pref="[[pref]]" on-tap="onIndicatorTap_"
          icon-aria-label="[[label]]">
      </cr-policy-pref-indicator>
    </template>

  </template>
  <script src="controlled_radio_button.js"></script>
</dom-module>