Time for action – responding to the user

When the user clicks on the icon, nothing happens. That's because there is no registered listener on the TrayItem itself. There are two listeners that can be registered; a SelectionListener, called when the icon is clicked, and a MenuDetectListener, which can respond to a context-sensitive menu. The former will be used to present a clock in its own window, which in SWT terms is called a Shell.

1. Open the Activator class.

2. Go to the lambda inside the asyncExec in the Activator class's start method.

3. After the creation of the TrayItem, call addSelectionListener with a new anonymous inner subclass of SelectionListener. In the widgetSelected method, a new Shell should be created with a ClockView and then shown:

   trayItem.addSelectionListener(new SelectionAdapter() {
     public void widgetSelected(SelectionEvent e) {
       Shell shell = new Shell(display);
       shell.setLayout(new FillLayout());
       new ClockWidget(shell, SWT.NONE, new RGB(255, 0, 255));
       shell.pack...