cleanup: Port non-GObject classes to JS6 classes

ES6 finally adds standard class syntax to the language, so we can
replace our custom Lang.Class framework with the new syntax. Any
classes that inherit from GObject will need special treatment,
so limit the port to regular javascript classes for now.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/361

js/misc/ibusManager.js

@@ -2,7 +2,6 @@
 
 const Gio = imports.gi.Gio;
 const GLib = imports.gi.GLib;
-const Lang = imports.lang;
 const Mainloop = imports.mainloop;
 const Signals = imports.signals;
 
@@ -32,17 +31,16 @@ function getIBusManager() {
     return _ibusManager;
 }
 
-var IBusManager = new Lang.Class({
-    Name: 'IBusManager',
-
-    // This is the longest we'll keep the keyboard frozen until an input
-    // source is active.
-    _MAX_INPUT_SOURCE_ACTIVATION_TIME: 4000, // ms
-    _PRELOAD_ENGINES_DELAY_TIME: 30, // sec
-
-    _init() {
+var IBusManager = class {
+    constructor() {
         IBus.init();
 
+        // This is the longest we'll keep the keyboard frozen until an input
+        // source is active.
+        this._MAX_INPUT_SOURCE_ACTIVATION_TIME = 4000; // ms
+        this._PRELOAD_ENGINES_DELAY_TIME = 30; // sec
+
+
         this._candidatePopup = new IBusCandidatePopup.CandidatePopup();
 
         this._panelService = null;
@@ -60,7 +58,7 @@ var IBusManager = new Lang.Class({
         this._ibus.connect('global-engine-changed', this._engineChanged.bind(this));
 
         this._spawn();
-    },
+    }
 
     _spawn() {
         try {
@@ -69,7 +67,7 @@ var IBusManager = new Lang.Class({
         } catch(e) {
             log('Failed to launch ibus-daemon: ' + e.message);
         }
-    },
+    }
 
     _clear() {
         if (this._panelService)
@@ -85,7 +83,7 @@ var IBusManager = new Lang.Class({
         this.emit('ready', false);
 
         this._spawn();
-    },
+    }
 
     _onConnected() {
         this._ibus.list_engines_async(-1, null, this._initEngines.bind(this));
@@ -93,7 +91,7 @@ var IBusManager = new Lang.Class({
                                       IBus.BusNameFlag.REPLACE_EXISTING,
                                       -1, null,
                                       this._initPanelService.bind(this));
-    },
+    }
 
     _initEngines(ibus, result) {
         let enginesList = this._ibus.list_engines_async_finish(result);
@@ -106,7 +104,7 @@ var IBusManager = new Lang.Class({
         } else {
             this._clear();
         }
-    },
+    }
 
     _initPanelService(ibus, result) {
         let success = this._ibus.request_name_async_finish(result);
@@ -151,13 +149,13 @@ var IBusManager = new Lang.Class({
         } else {
             this._clear();
         }
-    },
+    }
 
     _updateReadiness() {
         this._ready = (Object.keys(this._engines).length > 0 &&
                        this._panelService != null);
         this.emit('ready', this._ready);
-    },
+    }
 
     _engineChanged(bus, engineName) {
         if (!this._ready)
@@ -178,26 +176,26 @@ var IBusManager = new Lang.Class({
 
                 this.emit('properties-registered', this._currentEngineName, props);
             });
-    },
+    }
 
     _updateProperty(panel, prop) {
         this.emit('property-updated', this._currentEngineName, prop);
-    },
+    }
 
     _setContentType(panel, purpose, hints) {
         this.emit('set-content-type', purpose, hints);
-    },
+    }
 
     activateProperty(key, state) {
         this._panelService.property_activate(key, state);
-    },
+    }
 
     getEngineDesc(id) {
         if (!this._ready || !this._engines.hasOwnProperty(id))
             return null;
 
         return this._engines[id];
-    },
+    }
 
     setEngine(id, callback) {
         // Send id even if id == this._currentEngineName
@@ -211,7 +209,7 @@ var IBusManager = new Lang.Class({
 
         this._ibus.set_global_engine_async(id, this._MAX_INPUT_SOURCE_ACTIVATION_TIME,
                                            null, callback || null);
-    },
+    }
 
     preloadEngines(ids) {
         if (!this._ibus || ids.length == 0)
@@ -233,6 +231,6 @@ var IBusManager = new Lang.Class({
                                              this._preloadEnginesId = 0;
                                              return GLib.SOURCE_REMOVE;
                                          });
-    },
-});
+    }
+};
 Signals.addSignalMethods(IBusManager.prototype);