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How can we implement right click menu using JPopupMenu in Java?
In this article, we will learn to implement right right-click menu using JPopupMenu in Java. A JPopupMenu appears anywhere on the screen when the right mouse button is clicked.
JPopupMenu
A JPopupMenu menu is a free-floating menu that is associated with an underlying component called the invoker. Most of the time, a popup menu is linked to a specific component to display context-sensitive choices.
Syntax
The following is the syntax for JPopupMenu initialization:
JPopupMenu popup = new JPopupMenu();
In order to create a popup menu, we can use the JPopupMenu class., We can add the JMenuItem to the popup menu like a normal menu.
Implementing Right-Click Menu on JPopupMenu
To display the popup menu, we can call the show() method, normally popup menu is called in response to a mouse event. The following is the step-by-step for implementing the right-click menu on JPopupMenu in Java:
Class Declaration and Imports
The javax.swing.* provides Swing components (JPopupMenu, JFrame, etc.) while the java.awt.* provides AWT classes (Color, layout managers), and the class extends JFrame to create a window.
import java.awt.event.;
import java.awt.;
import javax.swing.*;
public class JPopupMenuTest extends JFrame {
Instance Variable & Constructor
Declares popup as a JPopupMenu component. The constructor sets the JFrame window titled "JPopupMenu Test". Gets the frame's content pane and initializes the JPopupMenu.
private JPopupMenu popup;
public JPopupMenuTest() {
setTitle("JPopupMenu Test");
Container contentPane = getContentPane() ;
popup = new JPopupMenu();
Adding Menu Items
Adds menu items as Cut, Copy, and Paste to the popup, inserts a separator line using the addSeparator() method, and adds Select All as another menu item.
popup.add(new JMenuItem("Cut"));
popup.add(new JMenuItem("Copy"));
popup.add(new JMenuItem("Paste"));
popup.addSeparator();
popup.add(new JMenuItem("SelectAll"));
Mouse Listener Setup
Sets up a MouseAdapter and overrides the mouseReleased()method to display the popup when the mouse is released.
contentPane.addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent me) {
showPopup(me);
}
});
showPopup() method
The show() method displays the popup menu at the mouse coordinates (getX(), getY()).
popup.show(me.getComponent(), me.getX(), me.getY());
Main Method
The main method launches the application by creating an object of JPopupMenuTest.
public static void main(String args[]) {
new JPopupMenuTest();
}
Example
Below is an example of implementing the right-click menu on JPopupMenu in Java:
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class JPopupMenuTest extends JFrame {
private JPopupMenu popup;
public JPopupMenuTest() {
setTitle("JPopupMenu Test");
Container contentPane = getContentPane() ;
popup = new JPopupMenu();
// add menu items to popup
popup.add(new JMenuItem("Cut"));
popup.add(new JMenuItem("Copy"));
popup.add(new JMenuItem("Paste"));
popup.addSeparator();
popup.add(new JMenuItem("SelectAll"));
contentPane.addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent me) {
showPopup(me); // showPopup() is our own user-defined method
}
}) ;
setSize(375, 250);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
void showPopup(MouseEvent me) {
if(me.isPopupTrigger())
popup.show(me.getComponent(), me.getX(), me.getY());
}
public static void main(String args[]) {
new JPopupMenuTest();
}
}
Output
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