Java/Swing JFC/Popup menu

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A popup menu is sometimes called a context menu

   <source lang="java">

import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JFrame; import javax.swing.JMenuItem; import javax.swing.JPopupMenu; public class PopupMenu { 

 public static void main(String[] args) {
   JFrame frame = new JFrame("JPopupMenu");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   final Toolkit toolkit = frame.getToolkit();
   final JPopupMenu menu = new JPopupMenu();
   JMenuItem menuItemBeep = new JMenuItem("Beep");
   menuItemBeep.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent e) {
       toolkit.beep();
     }
   });
   menu.add(menuItemBeep);
   JMenuItem menuItemClose = new JMenuItem("Close");
   menuItemClose.addActionListener(new ActionListener() {
     public void actionPerformed(ActionEvent e) {
       System.exit(0);
     }
   });
   menu.add(menuItemClose);
   frame.addMouseListener(new MouseAdapter() {
     public void mouseReleased(MouseEvent e) {
       if (e.getButton() == e.BUTTON3) {
         menu.show(e.getComponent(), e.getX(), e.getY());
       }
     }
   });
   frame.setSize(250, 200);
   frame.setLocationRelativeTo(null);
   frame.setVisible(true);
 }

} 

 </source>



Configure all popup menus to be heavyweight

   <source lang="java">

import javax.swing.JPopupMenu; public class Main { 

 public static void main(String[] argv) throws Exception {
   boolean lwPopup = JPopupMenu.getDefaultLightWeightPopupEnabled(); // true
   // Globally use heavyweight components for all popup menus
   JPopupMenu.setDefaultLightWeightPopupEnabled(false);
 }

} 

 </source>



Creating a Popup Menu

   <source lang="java">

import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import javax.swing.JButton; import javax.swing.JMenuItem; import javax.swing.JPopupMenu; public class Main { 

 public static void main(String[] argv) throws Exception {
   final JPopupMenu menu = new JPopupMenu();
   JMenuItem item = new JMenuItem("Item Label");

// item.addActionListener(actionListener); 

   menu.add(item);
   JButton component = new JButton("button");
   component.addMouseListener(new MouseAdapter() {
     public void mousePressed(MouseEvent evt) {
       if (evt.isPopupTrigger()) {
         menu.show(evt.getComponent(), evt.getX(), evt.getY());
       }
     }
     public void mouseReleased(MouseEvent evt) {
       if (evt.isPopupTrigger()) {
         menu.show(evt.getComponent(), evt.getX(), evt.getY());
       }
     }
   });
 }

} 

 </source>



Creating a Popup Menu with Nested Menus

   <source lang="java">

import javax.swing.JMenu; import javax.swing.JPopupMenu; public class Main { 

 public static void main(String[] argv) throws Exception {
   final JPopupMenu popupMenu = new JPopupMenu();
   JMenu submenu = new JMenu("SubMenu1");
   submenu.add("asdf");
   submenu.add("asdf");
   // Add submenu to popup menu
   popupMenu.add(submenu);
 }

} 

 </source>



Force the popup menu of a JMenu to be heavyweight

   <source lang="java">

import javax.swing.JMenu; import javax.swing.JMenuItem; public class Main { 

 public static void main(String[] argv) throws Exception {
   JMenu menu = new JMenu("Menu Label");
   menu.add(new JMenuItem("Item Label"));
   boolean lwPopup = menu.getPopupMenu().isLightWeightPopupEnabled(); // true
   menu.getPopupMenu().setLightWeightPopupEnabled(false);
 }

} 

 </source>



Forcing a Popup Menu to Be a Heavyweight Component

   <source lang="java">

import javax.swing.JPopupMenu; public class Main { 

 public static void main(String[] argv) throws Exception {
   JPopupMenu popupMenu = new JPopupMenu();
   boolean lwPopup = popupMenu.isLightWeightPopupEnabled(); // true
   popupMenu.setLightWeightPopupEnabled(false);
 }

} 

 </source>



JPopupMenu with mouse event

   <source lang="java">

import java.awt.Color; import java.awt.ruponent; 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();
 }

} 

 </source>



set Component Popup Menu

   <source lang="java">

import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JPopupMenu; import javax.swing.JTextArea; import javax.swing.JTextField; public class ContextMenu implements ActionListener { 

 JTextArea textArea = new JTextArea();
 public ContextMenu() {
   final JPopupMenu contextMenu = new JPopupMenu("Edit");
   contextMenu.add(makeMenuItem("Save"));
   contextMenu.add(makeMenuItem("Save As"));
   contextMenu.add(makeMenuItem("Close"));
   JFrame frame = new JFrame();
   JPanel panel = new JPanel();
   panel.setLayout(new BorderLayout());
   frame.add(panel);
   panel.setComponentPopupMenu(contextMenu);
   textArea.setInheritsPopupMenu(true);
   panel.add(BorderLayout.CENTER, textArea);
   JTextField textField = new JTextField();
   textField.setInheritsPopupMenu(true);
   panel.add(BorderLayout.SOUTH, textField);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(400, 200);
   frame.setVisible(true);
 }
 public void actionPerformed(ActionEvent e) {
   textArea.append(e.getActionCommand() + "\n");
 }
 private JMenuItem makeMenuItem(String label) {
   JMenuItem item = new JMenuItem(label);
   item.addActionListener(this);
   return item;
 }
 public static void main(String[] args) {
   new ContextMenu();
 }

} 

 </source>



setInheritsPopupMenu

   <source lang="java">

import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JPopupMenu; import javax.swing.JTextArea; import javax.swing.JTextField; public class ContextMenu implements ActionListener { 

 JTextArea textArea = new JTextArea();
 public ContextMenu() {
   final JPopupMenu contextMenu = new JPopupMenu("Edit");
   contextMenu.add(makeMenuItem("Save"));
   contextMenu.add(makeMenuItem("Save As"));
   contextMenu.add(makeMenuItem("Close"));
   JFrame frame = new JFrame();
   JPanel panel = new JPanel();
   panel.setLayout(new BorderLayout());
   frame.add(panel);
   panel.setComponentPopupMenu(contextMenu);
   textArea.setInheritsPopupMenu(true);
   panel.add(BorderLayout.CENTER, textArea);
   JTextField textField = new JTextField();
   textField.setInheritsPopupMenu(true);
   panel.add(BorderLayout.SOUTH, textField);
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(400, 200);
   frame.setVisible(true);
 }
 public void actionPerformed(ActionEvent e) {
   textArea.append(e.getActionCommand() + "\n");
 }
 private JMenuItem makeMenuItem(String label) {
   JMenuItem item = new JMenuItem(label);
   item.addActionListener(this);
   return item;
 }
 public static void main(String[] args) {
   new ContextMenu();
 }

} 

 </source>
Источник — «http://www.jexp.ru/index.php?title=Java/Swing_JFC/Popup_menu&oldid=7337»