FocusListener focusListener = new FocusListener() {
            @Override
            public void focusLost(FocusEvent event) {
                System.out.println("lost focus " + event.widget);
            }

            @Override
            public void focusGained(FocusEvent event) {
                System.out.println("get focus " + event.widget);
            }
        };

        Shell s = new Shell();
        s.addFocusListener(focusListener);

        Composite c = new Composite(s, SWT.NONE);
        c.setBounds(0, 0, 400, 500);
        c.addFocusListener(focusListener);

        Text t = new Text(c, SWT.BORDER);
        t.setBounds(0, 0, 400, 400);
        t.addFocusListener(focusListener);

        ToolBar b = new ToolBar(c, SWT.FLAT | SWT.NO_FOCUS);
        b.setBounds(0, 400, 400, 100);
        ToolItem ti = new ToolItem(b, SWT.NONE);
        ti.setImage(Display.getDefault().getSystemImage(SWT.ICON_INFORMATION));
        b.addFocusListener(focusListener);

        s.open();