Menu Demo 4
/*
Definitive Guide to Swing for Java 2, Second Edition
By John Zukowski
ISBN: 1-893115-78-X
Publisher: APress
*/
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
public class MediumPopupMenuSample {
public static void main(String args[]) {
// Define ActionListener
ActionListener aListener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.out.println("Selected: " + event.getActionCommand());
}
};
// Define PopupMenuListener
PopupMenuListener pListener = new PopupMenuListener() {
public void popupMenuCanceled(PopupMenuEvent event) {
System.out.println("Canceled");
}
public void popupMenuWillBecomeInvisible(PopupMenuEvent event) {
System.out.println("Becoming Invisible");
}
public void popupMenuWillBecomeVisible(PopupMenuEvent event) {
System.out.println("Becoming Visible");
}
};
// Define
JFrame frame = new JFrame("Popup Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPopupMenu.setDefaultLightWeightPopupEnabled(false);
// Create popup menu, attach popup menu listener
final JPopupMenu popupMenu = new JPopupMenu();
popupMenu.addPopupMenuListener(pListener);
// Cut
JMenuItem cutItem = new JMenuItem("Cut");
cutItem.addActionListener(aListener);
popupMenu.add(cutItem);
// Copy
JMenuItem copyItem = new JMenuItem("Copy");
copyItem.addActionListener(aListener);
popupMenu.add(copyItem);
// Paste
JMenuItem pasteItem = new JMenuItem("Paste");
pasteItem.addActionListener(aListener);
pasteItem.setEnabled(false);
popupMenu.add(pasteItem);
// Separator
popupMenu.addSeparator();
// Find
JMenuItem findItem = new JMenuItem("Find");
findItem.addActionListener(aListener);
popupMenu.add(findItem);
// Enable showing
MouseListener mouseListener = new JPopupMenuShower(popupMenu);
frame.addMouseListener(mouseListener);
Button button = new Button("Label");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println(popupMenu.isLightWeightPopupEnabled());
}
});
frame.getContentPane().add(button, BorderLayout.SOUTH);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
class JPopupMenuShower extends MouseAdapter {
private JPopupMenu popup;
public JPopupMenuShower(JPopupMenu popup) {
this.popup = popup;
}
private void showIfPopupTrigger(MouseEvent mouseEvent) {
if (popup.isPopupTrigger(mouseEvent)) {
popup.show(mouseEvent.getComponent(), mouseEvent.getX(), mouseEvent
.getY());
}
}
public void mousePressed(MouseEvent mouseEvent) {
showIfPopupTrigger(mouseEvent);
}
public void mouseReleased(MouseEvent mouseEvent) {
showIfPopupTrigger(mouseEvent);
}
}
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