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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);   } }