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

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+/* global SettingsListener */
+
+/**
+ * This module display Find My Device's enabled/disabled state on an
+ * element.
+ *
+ * @module panels/root/findmydevice_item
+ */
+define(function(require) {
+  'use strict';
+
+  /**
+   * @alias module:panels/root/findmydevice_item
+   * @class FindMyDeviceItem
+   * @param {HTMLElement} element
+                          The element displaying Find My Device's enabled state
+   * @returns {FindMyDeviceItem}
+   */
+  function FindMyDeviceItem(element) {
+    this._itemEnabled = false;
+    this._FMDEnabled = false;
+    this._boundRefreshText = this._refreshText.bind(this, element);
+    this._boundFMDEnabledChanged = this._onFMDEnabledChanged.bind(this);
+  }
+
+  FindMyDeviceItem.prototype = {
+    /**
+     * Refresh the text based on Find My Device's enabled state
+     *
+     * @access private
+     * @memberOf FindMyDeviceItem.prototype
+     * @param {HTMLElement} element
+                            The element showing Find My Device's enabled state
+     */
+    _refreshText: function fmd_refresh_text(element) {
+      if (!document.l10n) {
+        return;
+      }
+
+      element.setAttribute('data-l10n-id',
+                           this._FMDEnabled ? 'enabled' : 'disabled');
+      element.hidden = false;
+    },
+
+    /**
+     * Listener for changes in Find My Device's enabled state. Updates the
+     * text if this item is enabled.
+     *
+     * @access private
+     * @memberOf FindMyDeviceItem.prototype
+     * @param {Boolean} value
+                        The current enabled state for Find My Device
+     */
+    _onFMDEnabledChanged: function fmd_enabled_changed(value) {
+      this._FMDEnabled = value;
+      if (this._itemEnabled) {
+        this._boundRefreshText();
+      }
+    },
+
+    /**
+     * The value indicates whether the module is responding.
+     *
+     * @access public
+     * @memberOf FindMyDeviceItem.prototype
+     * @type {Boolean}
+     */
+    get enabled() {
+      return this._itemEnabled;
+    },
+
+    set enabled(value) {
+      if (this._itemEnabled === value) {
+        return;
+      }
+
+      this._itemEnabled = value;
+      if (this._itemEnabled) {
+        SettingsListener.observe('findmydevice.enabled', false,
+          this._boundFMDEnabledChanged);
+      } else {
+        SettingsListener.unobserve('findmydevice.enabled',
+          this._boundFMDEnabledChanged);
+      }
+    }
+  };
+
+  return function ctor_findMyDeviceItem(element) {
+    return new FindMyDeviceItem(element);
+  };
+});