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gaia/apps/settings/js/panels/keyboard/installed_keyboards.js

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+/**
+ * The module initializes a ListView displaying the installed keyboards.
+ * Implementation details please refer to {@link KeyboardCore}.
+ *
+ * @module keyboard/installed_keyboards
+ */
+define(function(require) {
+  'use strict';
+
+  var ListView = require('modules/mvvm/list_view');
+
+  /**
+   * @alias module:keyboard/installed_keyboards
+   * @class KeyboardCore
+   * @requires module:modules/mvvm/list_view
+   * @param {KeyboardContext} context
+                              The kyboard context providing installed keyboards.
+   * @param {Function} template
+                       The template function used to render an installed
+                       keyboard.
+   * @returns {KeyboardCore}
+   */
+  function KeyboardCore(context, template) {
+    this._enabled = false;
+    this._listView = null;
+    this._keyboardContext = context;
+    this._keyboardTemplate = template;
+  }
+
+  KeyboardCore.prototype = {
+    /**
+     * The value indicates whether the module is responding. If it is false, the
+     * UI stops reflecting the updates from the keyboard context.
+     *
+     * @access public
+     * @memberOf KeyboardCore.prototype
+     * @type {Boolean}
+     */
+    get enabled() {
+      return this._enabled;
+    },
+
+    set enabled(value) {
+      this._enabled = value;
+      if (this._listView) {
+        this._listView.enabled = this._enabled;
+      }
+    },
+
+    /**
+     * @access private
+     * @memberOf KeyboardCore.prototype
+     * @param {HTMLElement} listViewRoot
+     * @param {ObservableArray} keyboards
+     * @param {Function} keyboardTemplate
+     */
+    _initAllKeyboardListView:
+      function k_initListView(listViewRoot, keyboards, keyboardTemplate) {
+        listViewRoot.hidden = (keyboards.length === 0);
+        this._listView = ListView(listViewRoot, keyboards, keyboardTemplate);
+    },
+
+    /**
+     * @access public
+     * @memberOf KeyboardCore.prototype
+     * @param {Array} elements
+     *                Elements needed by this module.
+     * @param {HTMLElement} elements.listViewRoot
+     *                      The root element for the list view displaying the
+     *                      installed keyboards.
+     */
+    init: function k_init(elements) {
+      var that = this;
+      this._keyboardContext.init(function() {
+        that._keyboardContext.keyboards(function(keyboards) {
+          that._initAllKeyboardListView(
+            elements.listViewRoot, keyboards, that._keyboardTemplate);
+          that.enabled = true;
+        });
+      });
+    }
+  };
+
+  return function ctor_keyboardCore(context, template) {
+    return new KeyboardCore(context, template);
+  };
+});