Layout menu yourself : JMenu « Swing « Java Tutorial






Layout menu yourself
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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;

import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPopupMenu;

/**
 * @author ges
 * @author kwalrath
 */
/* MenuLayoutDemo.java requires no other files. */

public class MenuLayoutDemo {
  public JMenuBar createMenuBar() {
    JMenuBar menuBar = new JMenuBar();
    menuBar.setLayout(new BoxLayout(menuBar, BoxLayout.PAGE_AXIS));
    menuBar.add(createMenu("Menu 1"));
    menuBar.add(createMenu("Menu 2"));
    menuBar.add(createMenu("Menu 3"));

    menuBar.setBorder(BorderFactory.createMatteBorder(0, 0, 0, 1, Color.BLACK));
    return menuBar;
  }

  // used by createMenuBar
  public JMenu createMenu(String title) {
    JMenu m = new HorizontalMenu(title);
    m.add("Menu item #1 in " + title);
    m.add("Menu item #2 in " + title);
    m.add("Menu item #3 in " + title);

    JMenu submenu = new HorizontalMenu("Submenu");
    submenu.add("Submenu item #1");
    submenu.add("Submenu item #2");
    m.add(submenu);

    return m;
  }

  /**
   * 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("MenuLayoutDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Create and set up the content pane.
    MenuLayoutDemo demo = new MenuLayoutDemo();
    Container contentPane = frame.getContentPane();
    contentPane.setBackground(Color.WHITE); // contrasting bg
    contentPane.add(demo.createMenuBar(), BorderLayout.LINE_START);

    // Display the window.
    frame.setSize(300, 150);
    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 HorizontalMenu extends JMenu {
    HorizontalMenu(String label) {
      super(label);
      JPopupMenu pm = getPopupMenu();
      pm.setLayout(new BoxLayout(pm, BoxLayout.LINE_AXIS));
    }

    public Dimension getMinimumSize() {
      return getPreferredSize();
    }

    public Dimension getMaximumSize() {
      return getPreferredSize();
    }

    public void setPopupMenuVisible(boolean b) {
      boolean isVisible = isPopupMenuVisible();
      if (b != isVisible) {
        if ((b == true) && isShowing()) {
          // Set location of popupMenu (pulldown or pullright).
          // Perhaps this should be dictated by L&F.
          int x = 0;
          int y = 0;
          Container parent = getParent();
          if (parent instanceof JPopupMenu) {
            x = 0;
            y = getHeight();
          } else {
            x = getWidth();
            y = 0;
          }
          getPopupMenu().show(this, x, y);
        } else {
          getPopupMenu().setVisible(false);
        }
      }
    }
  }
}








14.21.JMenu
14.21.1.The JMenu component is the basic menu item container that is placed on a JMenuBar
14.21.2.what menus look like
14.21.3.Adding a Menu to a WindowAdding a Menu to a Window
14.21.4.Add Separator to JMenuAdd Separator to JMenu
14.21.5.Using Action Objects with MenusUsing Action Objects with Menus
14.21.6.Adding Menu ShortcutsAdding Menu Shortcuts
14.21.7.Set Mnemonic keySet Mnemonic key
14.21.8.SubmenuSubmenu
14.21.9.Listening to JMenu Events with a ChangeListener: register a ChangeListener with a JMenuListening to JMenu Events with a ChangeListener: register a ChangeListener with a JMenu
14.21.10.Using MenuListener to listen to: menu canceled, selected and deselected eventsUsing MenuListener to listen to: menu canceled, selected and deselected events
14.21.11.Layout menu yourselfLayout menu yourself
14.21.12.Customizing JMenu Look and Feel