Listen to event for editor focus / unfocus.

MessageBus bus = project.getMessageBus();

MessageBusConnection connection = bus.connect();

connection.subscribe(FileEditorManagerListener.FILE_EDITOR_MANAGER, new FileEditorManagerListener() {
        @Override
        public void fileOpened(@NotNull FileEditorManager source, @NotNull VirtualFile file) {
                System.out.println("11111111111111111111111111");
        }

        @Override
        public void fileClosed(@NotNull FileEditorManager source, @NotNull VirtualFile file) {
                System.out.println("222222222222222222222222222");
        }
});

This will only be triggered when something is opened, not when it is activated / unactivated. 

Is there a way to listen to desired events?