Question

I want to show a popup menu below a toolbar button when the user clicks this button. I’ve read about the SWT.DROP_DOWN style for a ToolItem but this seems very much limited to a simple list of items according to this sample. Instead, I want to show a popup menu with, e.g., checkbox and radio button menu items.

Answer 1

You can make MenuItem with styles SWT.CHECK, SWT.CASCADE, SWT.PUSH, SWT.RADIO, SWT.SEPARATOR
see javadoc..

So you can “hang” swt menu to selection of dropdown on toolbar item like this

public class Test {

private Shell shell;

public Test() {
    Display display = new Display();
    shell = new Shell(display, SWT.SHELL_TRIM);
    shell.setLayout(new FillLayout(SWT.VERTICAL));
    shell.setSize(50, 100);

    ToolBar toolbar = new ToolBar(shell, SWT.FLAT);
    ToolItem itemDrop = new ToolItem(toolbar, SWT.DROP_DOWN);
    itemDrop.setText("drop menu");

    itemDrop.addSelectionListener(new SelectionAdapter() {

        Menu dropMenu = null;

        @Override
        public void widgetSelected(SelectionEvent e) {
            if(dropMenu == null) {
                dropMenu = new Menu(shell, SWT.POP_UP);
                shell.setMenu(dropMenu);
                MenuItem itemCheck = new MenuItem(dropMenu, SWT.CHECK);
                itemCheck.setText("checkbox");
                MenuItem itemRadio = new MenuItem(dropMenu, SWT.RADIO);
                itemRadio.setText("radio1");
                MenuItem itemRadio2 = new MenuItem(dropMenu, SWT.RADIO);
                itemRadio2.setText("radio2");
            }

            if (e.detail == SWT.ARROW) {
                // Position the menu below and vertically aligned with the the drop down tool button.
                final ToolItem toolItem = (ToolItem) e.widget;
                final ToolBar  toolBar = toolItem.getParent();

                Point point = toolBar.toDisplay(new Point(e.x, e.y));
                dropMenu.setLocation(point.x, point.y);
                dropMenu.setVisible(true);
            } 

        }

    });

    shell.open();

    while(!shell.isDisposed()) {
        if(!display.readAndDispatch()) display.sleep();
    }

    display.dispose();
}

public static void main(String[] args) {
    new Test();
}

}