import java.awt.*;
import java.awt.event.*;

/** Provide a pop-up menu using a Frame.
 * On most platforms, changing the mouse "settings" changes how the
 * isPopupTrigger() method behaves instantly - which is as it should be!
 */
public class PopupDemo extends Frame {
	/** "main" method - for testing. */
	public static void main(String[] av) {
		new PopupDemo("Hello").setVisible(true);
	}

	/** Construct the main program */
	public PopupDemo(String title) {
		super(title);

		setLayout(new FlowLayout());
		add(new PopupContainer(
			"Hello, and welcome to the world of Java"));
		pack();
		setVisible(true);
	}
}

/* A component to demonstrate use of PopupMenu.
 * The user has to ask for the menu to popup in Java's
 * platform-dependant way (e.g., right mouse click on X Windows, MS-Windows).
 *
 * Alternately, you could watch for keypress events and provide
 * your own platform-independant keyboard popup menu character
 * such as M for Menu (not CTRL/M; Mac's don't have a CTRL key).
 */
class PopupContainer extends Component {
	PopupMenu m;
	PopupContainer(String s) {
		m = new PopupMenu(s);
		m.add(new MenuItem("Open"));
		m.add(new MenuItem("Close"));
		MenuItem qB;
		m.add(qB = new MenuItem("Exit"));
		class Quitter implements ActionListener {
			public void actionPerformed(ActionEvent e) {
				System.exit(0);
			}
		}
		qB.addActionListener(new Quitter());

		add(m);		// add Popup to Component

		enableEvents(AWTEvent.MOUSE_EVENT_MASK);
	}


	public void processMouseEvent(MouseEvent me) {
			System.err.println("MouseEvent: " + me);
			if (me.isPopupTrigger())
				m.show(this, me.getX(), me.getY());
			else
				super.processMouseEvent(me);
	};

	/** Compute our minimum size */
	public Dimension getMinimumSize() {
		return new Dimension(200, 200);
	}

	final int PREF_PAD=10;

	/** Computer our best size */
	public Dimension getPreferredSize() {
		Dimension d = getMinimumSize();
		return new Dimension(d.width+PREF_PAD, d.height+PREF_PAD);
	}

	/** Computer our maximum allowed size */
	public Dimension getMaximumSize() {
		Dimension d = getMinimumSize();
		return new Dimension(d.width*2, d.height*2);
	}
}