language-view.html

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  Copyright 2018 The Outline Authors

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
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<link rel="import" href="../bower_components/polymer/polymer-element.html" />
<link rel="import" href="../bower_components/polymer/lib/mixins/dir-mixin.html" />
<link rel="import" href="../bower_components/polymer/lib/elements/dom-repeat.html" />
<link rel="import" href="../bower_components/polymer/lib/elements/dom-if.html" />

<dom-module id="language-view">
  <template>
    <style>
      :host {
        background: #fff;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        text-align: center;
        width: 100%;
        height: 100vh;
      }
      .language-item {
        display: flex;
        cursor: pointer;
        font-size: 16px;
        border-bottom: 1px solid #e0e0e0;
        padding-left: 24px;
        --paper-item-selected: {
          color: var(--medium-green);
          font-weight: normal;
        }
      }
      .language-name {
        text-align: left;
        flex-grow: 1;
      }
    </style>

    <div id="main">
      <paper-listbox selected="{{selectedLanguage}}" attr-for-selected="value" on-selected-changed="_languageSelected">
        <template is="dom-repeat" items="{{languages}}" as="lang">
          <paper-item class="language-item" value="{{lang.id}}">
            <span class="language-name">{{lang.name}}</span>
            <iron-icon icon="check" hidden$="{{_shouldHideCheckmark(selectedLanguage, lang.id)}}"></iron-icon>
          </paper-item>
        </template>
      </paper-listbox>
    </div>
  </template>

  <script>
    class OutlineLanguageView extends Polymer.DirMixin(Polymer.Element) {
      static get is() {
        return "language-view";
      }

      static get properties() {
        return {
          selectedLanguage: String,
          // An array of {id, name, dir} language objects.
          languages: {
            type: Array,
            readonly: true,
          },
        };
      }

      _languageSelected(event) {
        const languageCode = event.detail.value;
        const params = {bubbles: true, composed: true, detail: {languageCode}};
        this.language = languageCode;
        this.dispatchEvent(new CustomEvent("SetLanguageRequested", params));
      }

      _shouldHideCheckmark(selectedLanguage, languageCode) {
        return selectedLanguage !== languageCode;
      }
    }
    customElements.define(OutlineLanguageView.is, OutlineLanguageView);
  </script>
</dom-module>