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I would like to add right click menu for my program. I added basit menu with the following code:

 Pmenu = new JPopupMenu("Menu"); menuItem = new JMenuItem("Sections"); Pmenu.add(menuItem); menuItem = new JMenuItem("Numbers"); Pmenu.add(menuItem);

However I want to add submenu to these menus, such as user hover the Sections menu, submenu will open and sections are shown.

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3 Answers 3

Reset to default
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First, an Object name usually starts with a small letter, caps letters are usually used for class/interface names.

For your question, here is the code for submenus

//parent menu JPopupMenu pmenu = new JPopupMenu("Menu"); //sub menu JMenu sectionsMenu = new JMenu("Sections"); JMenuItem menuItem1 = new JMenuItem("Item1"); sectionsMenu .add(menuItem1 ); JMenuItem menuItem2 = new JMenuItem("Item2"); sectionsMenu .add(menuItem2 ); pmenu.add(sectionsMenu); //regular menu item menuItem = new JMenuItem("Numbers"); pmenu.add(menuItem);

JMenu tutorial or submenu examble

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4

Add a JMenu instance to your JPopupMenu. The JMenu should of course contain JMenuItem instances.

See http://download.oracle.com/javase/tutorial/uiswing/components/menu.html for a tutorial over menus in Swing.

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I used JMenu in my menubar, but how should I show that menu in exact location when user right-clicked ?
Use myPanel.setComponentPopupMenu(popupMenu), and the popup menu will appear when you right-click on myPanel.
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public JMenuBar createMenuBar() { JMenuBar menuBar; JMenu menu, submenu; JMenuItem menuItem; JRadioButtonMenuItem rbMenuItem; JCheckBoxMenuItem cbMenuItem; //Create the menu bar. menuBar = new JMenuBar(); //Build the first menu. menu = new JMenu("A Menu"); menu.setMnemonic(KeyEvent.VK_A); menu.getAccessibleContext().setAccessibleDescription( "The only menu in this program that has menu items"); menuBar.add(menu); //a group of JMenuItems menuItem = new JMenuItem("A text-only menu item", KeyEvent.VK_T); //menuItem.setMnemonic(KeyEvent.VK_T); //used constructor instead menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_1, ActionEvent.ALT_MASK)); menuItem.getAccessibleContext().setAccessibleDescription( "This doesn't really do anything"); menuItem.addActionListener(this); menu.add(menuItem); ImageIcon icon = createImageIcon("images/middle.gif"); menuItem = new JMenuItem("Both text and icon", icon); menuItem.setMnemonic(KeyEvent.VK_B); menuItem.addActionListener(this); menu.add(menuItem); menuItem = new JMenuItem(icon); menuItem.setMnemonic(KeyEvent.VK_D); menuItem.addActionListener(this); menu.add(menuItem); //a group of radio button menu items menu.addSeparator(); ButtonGroup group = new ButtonGroup(); rbMenuItem = new JRadioButtonMenuItem("A radio button menu item"); rbMenuItem.setSelected(true); rbMenuItem.setMnemonic(KeyEvent.VK_R); group.add(rbMenuItem); rbMenuItem.addActionListener(this); menu.add(rbMenuItem); rbMenuItem = new JRadioButtonMenuItem("Another one"); rbMenuItem.setMnemonic(KeyEvent.VK_O); group.add(rbMenuItem); rbMenuItem.addActionListener(this); menu.add(rbMenuItem); //a group of check box menu items menu.addSeparator(); cbMenuItem = new JCheckBoxMenuItem("A check box menu item"); cbMenuItem.setMnemonic(KeyEvent.VK_C); cbMenuItem.addItemListener(this); menu.add(cbMenuItem); cbMenuItem = new JCheckBoxMenuItem("Another one"); cbMenuItem.setMnemonic(KeyEvent.VK_H); cbMenuItem.addItemListener(this); menu.add(cbMenuItem); //a submenu menu.addSeparator(); submenu = new JMenu("A submenu"); submenu.setMnemonic(KeyEvent.VK_S); menuItem = new JMenuItem("An item in the submenu"); menuItem.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_2, ActionEvent.ALT_MASK)); menuItem.addActionListener(this); submenu.add(menuItem); menuItem = new JMenuItem("Another item"); menuItem.addActionListener(this); submenu.add(menuItem); menu.add(submenu); //Build second menu in the menu bar. menu = new JMenu("Another Menu"); menu.setMnemonic(KeyEvent.VK_N); menu.getAccessibleContext().setAccessibleDescription( "This menu does nothing"); menuBar.add(menu); return menuBar; } public Container createContentPane() { //Create the content-pane-to-be. JPanel contentPane = new JPanel(new BorderLayout()); contentPane.setOpaque(true); //Create a scrolled text area. output = new JTextArea(5, 30); output.setEditable(false); scrollPane = new JScrollPane(output); //Add the text area to the content pane. contentPane.add(scrollPane, BorderLayout.CENTER); return contentPane; } public void createPopupMenu() { JMenuItem menuItem; //Create the popup menu. JPopupMenu popup = new JPopupMenu(); menuItem = new JMenuItem("A popup menu item"); menuItem.addActionListener(this); popup.add(menuItem); menuItem = new JMenuItem("Another popup menu item"); menuItem.addActionListener(this); popup.add(menuItem); //Add listener to the text area so the popup menu can come up. MouseListener popupListener = new PopupListener(popup); output.addMouseListener(popupListener); } public void actionPerformed(ActionEvent e) { JMenuItem source = (JMenuItem)(e.getSource()); String s = "Action event detected." + newline + " Event source: " + source.getText() + " (an instance of " + getClassName(source) + ")"; output.append(s + newline); output.setCaretPosition(output.getDocument().getLength()); } public void itemStateChanged(ItemEvent e) { JMenuItem source = (JMenuItem)(e.getSource()); String s = "Item event detected." + newline + " Event source: " + source.getText() + " (an instance of " + getClassName(source) + ")" + newline + " New state: " + ((e.getStateChange() == ItemEvent.SELECTED) ? "selected":"unselected"); output.append(s + newline); output.setCaretPosition(output.getDocument().getLength()); } // Returns just the class name -- no package info. protected String getClassName(Object o) { String classString = o.getClass().getName(); int dotIndex = classString.lastIndexOf("."); return classString.substring(dotIndex+1); } /** Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = PopupMenuDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Create and set up the window. JFrame frame = new JFrame("PopupMenuDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create/set menu bar and content pane. PopupMenuDemo demo = new PopupMenuDemo(); frame.setJMenuBar(demo.createMenuBar()); frame.setContentPane(demo.createContentPane()); //Create and set up the popup menu. demo.createPopupMenu(); //Display the window. frame.setSize(450, 260); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } class PopupListener extends MouseAdapter { JPopupMenu popup; PopupListener(JPopupMenu popupMenu) { popup = popupMenu; } public void mousePressed(MouseEvent e) { maybeShowPopup(e); } public void mouseReleased(MouseEvent e) { maybeShowPopup(e); } private void maybeShowPopup(MouseEvent e) { if (e.isPopupTrigger()) { popup.show(e.getComponent(), e.getX(), e.getY()); } } }

}

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1 Comment

"addActionListener(this)" means you do the construction inside the ActionListener !?

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