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

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+/**
+ * The moudle supports displaying nfc toggle on an element.
+ *
+ * @module panels/root/nfc_item
+ */
+define(function(require) {
+  'use strict';
+
+  var SettingsListener = require('shared/settings_listener');
+
+  /**
+   * @alias module:panels/root/nfc_item
+   * @class NFCItem
+   * @param {Object} elements
+   * @param {HTMLElement} elements.nfcMenuItem
+   * @param {HTMLElement} elements.nfcCheckBox
+   * @returns {NFCItem}
+   */
+  function NFCItem(elements) {
+    if (!navigator.mozNfc) {
+      return;
+    }
+    elements.nfcMenuItem.hidden = false;
+    this._checkbox = elements.nfcCheckBox;
+    this._checkbox.addEventListener('change', () => this._onCheckboxChanged());
+
+    SettingsListener.observe('nfc.status', undefined,
+                             (status) => this._onNfcStatusChanged(status));
+  }
+
+  NFCItem.prototype = {
+    // disabling on change to prevent double clicking and remove toggle
+    // flickering before nfcManger will change nfc.status
+    _onCheckboxChanged: function ni_onCheckboxChanged() {
+      this._checkbox.disabled = true;
+    },
+
+    _onNfcStatusChanged: function ni_onNfcStatusChanged(status) {
+      if (status === 'enabling' || status === 'disabling') {
+        this._checkbox.disabled = true;
+      } else if (status === 'enabled' || status === 'disabled') {
+        this._checkbox.disabled = false;
+      }
+    }
+  };
+
+  return function ctor_nfcItem(elements) {
+    return new NFCItem(elements);
+  };
+});