Java by API/javax.swing/JMenuItem

JMenuItem: addActionListener(ActionListener l)

 

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractButton;
import javax.swing.Icon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
public class Main {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("MenuSample Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();
    // File Menu, F - Mnemonic
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(fileMenu);
    // File->New, N - Mnemonic
    JMenuItem newMenuItem = new JMenuItem("New", KeyEvent.VK_N);
    fileMenu.add(newMenuItem);
    JCheckBoxMenuItem caseMenuItem = new JCheckBoxMenuItem("Case Sensitive");
    caseMenuItem.setMnemonic(KeyEvent.VK_C);
    fileMenu.add(caseMenuItem);
    ActionListener aListener = new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        AbstractButton aButton = (AbstractButton) event.getSource();
        boolean selected = aButton.getModel().isSelected();
        String newLabel;
        Icon newIcon;
        if (selected) {
          newLabel = "A";
        } else {
          newLabel = "B";
        }
        aButton.setText(newLabel);
      }
    };
    caseMenuItem.addActionListener(aListener);
    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}

JMenuItem: addChangeListener(ChangeListener l)

 
  
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class Main {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("MenuSample Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();
    // File Menu, F - Mnemonic
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(fileMenu);
    fileMenu.addChangeListener(new ChangeListener() {
      public void stateChanged(ChangeEvent e) {
        System.out.println("File Menu Changed");
      }
    });
    // File->New, N - Mnemonic
    JMenuItem newMenuItem = new JMenuItem("New");
    fileMenu.add(newMenuItem);
    newMenuItem.addChangeListener(new ChangeListener() {
      public void stateChanged(ChangeEvent e) {
        System.out.println("new menu item changed");
      }
    });
    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}

JMenuItem: addItemListener(ItemListener l)

 
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractButton;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
public class Main {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("MenuSample Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();
    // File Menu, F - Mnemonic
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(fileMenu);
    // File->New, N - Mnemonic
    JMenuItem newMenuItem = new JMenuItem("New", KeyEvent.VK_N);
    fileMenu.add(newMenuItem);
    JCheckBoxMenuItem caseMenuItem = new JCheckBoxMenuItem("Case Sensitive");
    caseMenuItem.setMnemonic(KeyEvent.VK_C);
    fileMenu.add(caseMenuItem);
    ItemListener iListener = new ItemListener() {
      public void itemStateChanged(ItemEvent event) {
        Icon girlIcon = new ImageIcon("g.jpg");
        Icon boyIcon = new ImageIcon("b.jpg");
        AbstractButton aButton = (AbstractButton)event.getSource();
        int state = event.getStateChange();
        String newLabel;
        Icon newIcon;
        if (state == ItemEvent.SELECTED) {
          newLabel = "Girl";
          newIcon = girlIcon;
        } else {
          newLabel = "Boy";
          newIcon = boyIcon;
        }
        aButton.setText(newLabel);
        aButton.setIcon(newIcon);
      }
    };
    caseMenuItem.addItemListener(iListener);
    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}

JMenuItem: addMenuDragMouseListener(MenuDragMouseListener l)

 
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.event.MenuDragMouseEvent;
import javax.swing.event.MenuDragMouseListener;
public class Main {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("MenuSample Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();
    // File Menu, F - Mnemonic
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(fileMenu);
    // File->New, N - Mnemonic
    JMenuItem newMenuItem = new JMenuItem("asdf");
    fileMenu.add(newMenuItem);
    
    newMenuItem.addMenuDragMouseListener(new MenuDragMouseListener(){
      public void menuDragMouseEntered(MenuDragMouseEvent e) {
        System.out.println("menuDragMouseEntered");        
      }
      public void menuDragMouseExited(MenuDragMouseEvent e) {
       System.out.println("menuDragMouseExited");
        
      }
      public void menuDragMouseDragged(MenuDragMouseEvent e) {
        System.out.println("menuDragMouseDragged");
        
      }
      public void menuDragMouseReleased(MenuDragMouseEvent e) {
        System.out.println("menuDragMouseReleased");
        
      }});
    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}

JMenuItem: addMenuKeyListener(MenuKeyListener l)

 

import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.event.MenuKeyEvent;
import javax.swing.event.MenuKeyListener;
public class Main {
  public static void main(final String args[]) {
    JFrame frame = new JFrame("MenuSample Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();
    // File Menu, F - Mnemonic
    JMenu fileMenu = new JMenu("File");
    fileMenu.setMnemonic(KeyEvent.VK_F);
    menuBar.add(fileMenu);
    // File->New, N - Mnemonic
    JMenuItem newMenuItem = new JMenuItem("asdf");
    fileMenu.add(newMenuItem);
    
    newMenuItem.addMenuKeyListener(new MenuKeyListener(){
      public void menuKeyTyped(MenuKeyEvent e) {
       System.out.println("KeyTyped");
      }
      public void menuKeyPressed(MenuKeyEvent e) {
        System.out.println("KeyPressed");
      }
      public void menuKeyReleased(MenuKeyEvent e) {
        System.out.println("KeyReleased");
      }});
    
    frame.setJMenuBar(menuBar);
    frame.setSize(350, 250);
    frame.setVisible(true);
  }
}

JMenuItem.RIGHT

 
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.border.BevelBorder;
import javax.swing.event.PopupMenuEvent;
import javax.swing.event.PopupMenuListener;
public class MainClass extends JPanel {
  public JPopupMenu popup;
  public MainClass() {
    popup = new JPopupMenu();
    ActionListener menuListener = new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        System.out.println("Popup menu item [" + event.getActionCommand() + "] was pressed.");
      }
    };
    JMenuItem item;
    popup.add(item = new JMenuItem("Left", new ImageIcon("left.gif")));
    item.setHorizontalTextPosition(JMenuItem.RIGHT);
    item.addActionListener(menuListener);
    popup.add(item = new JMenuItem("Center", new ImageIcon("center.gif")));
    item.setHorizontalTextPosition(JMenuItem.RIGHT);
    item.addActionListener(menuListener);
    popup.add(item = new JMenuItem("Right", new ImageIcon("right.gif")));
    item.setHorizontalTextPosition(JMenuItem.RIGHT);
    item.addActionListener(menuListener);
    popup.add(item = new JMenuItem("Full", new ImageIcon("full.gif")));
    item.setHorizontalTextPosition(JMenuItem.RIGHT);
    item.addActionListener(menuListener);
    popup.addSeparator();
    popup.add(item = new JMenuItem("Settings . . ."));
    item.addActionListener(menuListener);
    popup.setLabel("Justification");
    popup.setBorder(new BevelBorder(BevelBorder.RAISED));
    popup.addPopupMenuListener(new PopupPrintListener());
    addMouseListener(new MousePopupListener());
  }
  // An inner class to check whether mouse events are the popup trigger
  class MousePopupListener extends 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()) {
        popup.show(MainClass.this, e.getX(), e.getY());
      }
    }
  }
  // An inner class to show when popup events occur
  class PopupPrintListener implements PopupMenuListener {
    public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
      System.out.println("Popup menu will be visible!");
    }
    public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
      System.out.println("Popup menu will be invisible!");
    }
    public void popupMenuCanceled(PopupMenuEvent e) {
      System.out.println("Popup menu is hidden!");
    }
  }
  public static void main(String s[]) {
    JFrame frame = new JFrame("Popup Menu Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(new MainClass());
    frame.setSize(300, 300);
    frame.setVisible(true);
  }
}

JMenuItem: setAccelerator(KeyStroke key)

 
import java.awt.BorderLayout;
import java.awt.ruponent;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.KeyStroke;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Mnemonic/Accelerator Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    final Action printAction = new PrintHelloAction();
    JMenuBar menuBar = new JMenuBar();
    JMenu menu = new JMenu("File");
    menuBar.add(menu);
    JMenuItem menuItem = new JMenuItem("Print");
    KeyStroke ctrlP = KeyStroke.getKeyStroke(KeyEvent.VK_P,
        InputEvent.CTRL_MASK);
    menuItem.setAccelerator(ctrlP);
    menuItem.addActionListener(printAction);
    menu.add(menuItem);
    JButton fileButton = new JButton("About");
    fileButton.setMnemonic(KeyEvent.VK_A);
    fileButton.addActionListener(printAction);
    frame.setJMenuBar(menuBar);
    frame.add(fileButton, BorderLayout.SOUTH);
    frame.setSize(300, 100);
    frame.setVisible(true);
  }
}
class PrintHelloAction extends AbstractAction {
  private static final Icon printIcon = new MyIcon();
  PrintHelloAction() {
    super("Print", printIcon);
    putValue(Action.SHORT_DESCRIPTION, "Hello, World");
  }
  public void actionPerformed(ActionEvent actionEvent) {
    System.out.println("Hello, World");
  }
}
class MyIcon implements Icon {
  public int getIconWidth() {
    return 32;
  }
  public int getIconHeight() {
    return 32;
  }
  public void paintIcon(Component c, Graphics g, int x, int y) {
    g.drawString("jexp.ru", 0, 20);
  }
}

JMenuItem: setMnemonic(char mnemonic)

 
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.border.BevelBorder;
public class MainClass extends JPanel {
  public JTextPane pane;
  public JMenuBar menuBar;
  public MainClass() {
    menuBar = new JMenuBar();
    JMenu formatMenu = new JMenu("Justify");
    formatMenu.setMnemonic("J");
    MenuAction leftJustifyAction = new MenuAction("Left", new ImageIcon("left.gif"));
    MenuAction rightJustifyAction = new MenuAction("Right", new ImageIcon("right.gif"));
    MenuAction centerJustifyAction = new MenuAction("Center", new ImageIcon("center.gif"));
    MenuAction fullJustifyAction = new MenuAction("Full", new ImageIcon("full.gif"));
    JMenuItem item;
    item = formatMenu.add(leftJustifyAction);
    item.setMnemonic("L");
    item = formatMenu.add(rightJustifyAction);
    item.setMnemonic("R");
    item = formatMenu.add(centerJustifyAction);
    item.setMnemonic("C");
    item = formatMenu.add(fullJustifyAction);
    item.setMnemonic("F");
    menuBar.add(formatMenu);
    menuBar.setBorder(new BevelBorder(BevelBorder.RAISED));
  }
  class MenuAction extends AbstractAction {
    public MenuAction(String text, Icon icon) {
      super(text, icon);
    }
    public void actionPerformed(ActionEvent e) {
      try {
        pane.getStyledDocument().insertString(0,
            "Action [" + e.getActionCommand() + "] performed!\n", null);
      } catch (Exception ex) {
        ex.printStackTrace();
      }
    }
  }
  public static void main(String s[]) {
    MainClass example = new MainClass();
    example.pane = new JTextPane();
    example.pane.setPreferredSize(new Dimension(250, 250));
    example.pane.setBorder(new BevelBorder(BevelBorder.LOWERED));
    JFrame frame = new JFrame("Menu Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setJMenuBar(example.menuBar);
    frame.getContentPane().add(example.pane, BorderLayout.CENTER);
    frame.pack();
    frame.setVisible(true);
  }
}

new JMenuItem(Action act)

 
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JToolBar;
public class MainClass {
  public static void main(String args[]) {
    JFrame frame = new JFrame("Action Sample");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    final Action printAction = new PrintHelloAction();
    JMenuBar menuBar = new JMenuBar();
    JMenu menu = new JMenu("File");
    menuBar.add(menu);
    menu.add(new JMenuItem(printAction));
    JToolBar toolbar = new JToolBar();
    toolbar.add(new JButton(printAction));
    JButton enableButton = new JButton("Enable");
    ActionListener enableActionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        printAction.setEnabled(true);
      }
    };
    enableButton.addActionListener(enableActionListener);
    JButton disableButton = new JButton("Disable");
    ActionListener disableActionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        printAction.setEnabled(false);
      }
    };
    disableButton.addActionListener(disableActionListener);
    JButton relabelButton = new JButton("Relabel");
    ActionListener relabelActionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        printAction.putValue(Action.NAME, "Hello, World");
      }
    };
    relabelButton.addActionListener(relabelActionListener);
    JPanel buttonPanel = new JPanel();
    buttonPanel.add(enableButton);
    buttonPanel.add(disableButton);
    buttonPanel.add(relabelButton);
    frame.setJMenuBar(menuBar);
    frame.add(toolbar, BorderLayout.SOUTH);
    frame.add(buttonPanel, BorderLayout.NORTH);
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}
class PrintHelloAction extends AbstractAction {
  PrintHelloAction() {
    super("Print");
    putValue(Action.SHORT_DESCRIPTION, "Hello, World");
  }
  public void actionPerformed(ActionEvent actionEvent) {
    System.out.println("Hello, World");
  }
}