PopupSample.java Source code

Introduction

Here is the source code for PopupSample.java

Source

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 PopupSample {

    public static void main(String args[]) {
        ActionListener actionListener = new ActionListener() {
            public void actionPerformed(ActionEvent actionEvent) {
                System.out.println("Selected: " + actionEvent.getActionCommand());
            }
        };

        PopupMenuListener popupMenuListener = new PopupMenuListener() {
            public void popupMenuCanceled(PopupMenuEvent popupMenuEvent) {
                System.out.println("Canceled");
            }

            public void popupMenuWillBecomeInvisible(PopupMenuEvent popupMenuEvent) {
                System.out.println("Becoming Invisible");
            }

            public void popupMenuWillBecomeVisible(PopupMenuEvent popupMenuEvent) {
                System.out.println("Becoming Visible");
            }
        };

        JFrame frame = new JFrame("Popup Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPopupMenu popupMenu = new JPopupMenu();
        popupMenu.addPopupMenuListener(popupMenuListener);

        JMenuItem cutMenuItem = new JMenuItem("Cut");
        cutMenuItem.addActionListener(actionListener);
        popupMenu.add(cutMenuItem);

        JMenuItem copyMenuItem = new JMenuItem("Copy");
        copyMenuItem.addActionListener(actionListener);
        popupMenu.add(copyMenuItem);

        JMenuItem pasteMenuItem = new JMenuItem("Paste");
        pasteMenuItem.addActionListener(actionListener);
        pasteMenuItem.setEnabled(false);
        popupMenu.add(pasteMenuItem);

        popupMenu.addSeparator();

        JMenuItem findMenuItem = new JMenuItem("Find");
        findMenuItem.addActionListener(actionListener);
        popupMenu.add(findMenuItem);

        MouseListener mouseListener = new JPopupMenuShower(popupMenu);
        frame.addMouseListener(mouseListener);

        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);
    }
}