PopUpColorMenu.java Source code

Introduction

Here is the source code for PopUpColorMenu.java

Source

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.FlowLayout;
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.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;

public class PopUpColorMenu implements ActionListener {
    Component selectedComponent;

    public PopUpColorMenu() {
        JFrame frame = new JFrame();

        final JPopupMenu colorMenu = new JPopupMenu("Color");
        colorMenu.add(makeMenuItem("Red"));
        colorMenu.add(makeMenuItem("Green"));
        colorMenu.add(makeMenuItem("Blue"));

        MouseListener mouseListener = new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                checkPopup(e);
            }

            public void mouseClicked(MouseEvent e) {
                checkPopup(e);
            }

            public void mouseReleased(MouseEvent e) {
                checkPopup(e);
            }

            private void checkPopup(MouseEvent e) {
                if (e.isPopupTrigger()) {
                    selectedComponent = e.getComponent();
                    colorMenu.show(e.getComponent(), e.getX(), e.getY());
                }
            }
        };

        frame.setLayout(new FlowLayout());
        JButton button = new JButton("Uno");
        button.addMouseListener(mouseListener);
        frame.add(button);
        button = new JButton("Due");
        button.addMouseListener(mouseListener);
        frame.add(button);
        button = new JButton("Tre");
        button.addMouseListener(mouseListener);
        frame.add(button);

        frame.getContentPane().addMouseListener(mouseListener);

        frame.setSize(200, 50);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        String color = e.getActionCommand();
        if (color.equals("Red"))
            selectedComponent.setBackground(Color.red);
        else if (color.equals("Green"))
            selectedComponent.setBackground(Color.green);
        else if (color.equals("Blue"))
            selectedComponent.setBackground(Color.blue);
    }

    private JMenuItem makeMenuItem(String label) {
        JMenuItem item = new JMenuItem(label);
        item.addActionListener(this);
        return item;
    }

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