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gaia/apps/settings/js/panels/root/language_item.js

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+/**
+ * The moudle supports displaying language information on an element.
+ *
+ * @module panels/root/language_item
+ */
+define(function(require) {
+  'use strict';
+
+  var LanguageList = require('shared/language_list');
+
+  /**
+   * @alias module:panels/root/language_item
+   * @class LanguageItem
+   * @param {HTMLElement} element
+                          The element displaying the language information
+   * @returns {LanguageItem}
+   */
+  function LanguageItem(element) {
+    this._enabled = false;
+    this._boundRefreshText = this._refreshText.bind(this, element);
+  }
+
+  LanguageItem.prototype = {
+    /**
+     * Refresh the text based on the language setting.
+     *
+     * @access private
+     * @memberOf LanguageItem.prototype
+     * @param {HTMLElement} element
+                            The element displaying the language information
+     */
+    _refreshText: function l_refeshText(element) {
+      // display the current locale in the main panel
+      LanguageList.get(function displayLang(languages, currentLanguage) {
+        element.textContent = LanguageList.wrapBidi(
+          currentLanguage, languages[currentLanguage]);
+      });
+    },
+
+    /**
+     * The value indicates whether the module is responding.
+     *
+     * @access public
+     * @memberOf LanguageItem.prototype
+     * @type {Boolean}
+     */
+    get enabled() {
+      return this._enabled;
+    },
+
+    set enabled(value) {
+      if (this._enabled === value || !document.l10n) {
+        return;
+      }
+      
+      this._enabled = value;
+      if (this._enabled) {
+        document.addEventListener('DOMRetranslated', this._boundRefreshText);
+        this._boundRefreshText();
+      } else {
+        document.removeEventListener('DOMRetranslated', this._boundRefreshText);
+      }
+    }
+  };
+
+  return function ctor_languageItem(element) {
+    return new LanguageItem(element);
+  };
+});