SwingとAWTの混在はだめなのか？

SwingがいちおうAWTと共存して利用できるようになっているが、だめなパターンがある。どうやら、SwingのJMenuの類（JManuBarとか）とAWTのPanelをいっしょに使うととPanelがJMenuを隠してしまう。

とりあえず、EclipseのVisual Editorを使って、やっつけでサンプルを作ってみた。JFrameにJMenuとJTabbedPaneを置いて、そのうえにJPanelを置いたものである。 上の画像のウィンドウは、メニューはちゃんと表示されていて、これは特に問題ない。

つぎの画像は、JPanelの上にPanelを置いたものである。見た目あまりわかりづらいかもしれないが、メニューのセパレーターの下からが隠れてしまっている。AWTのPanelがメニューの上にかぶさってしまって、隠れて見えなくなっている。JTabbedPaneの青いところの上にメニューがあるようなので、Panelだけがメニューを隠しているようだ。

参考になるコードではないが、折角作ったので載せておくw。

import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.event.KeyEvent;

import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JSeparator;
import javax.swing.JTabbedPane;
import java.awt.GridBagLayout;
import javax.swing.JLabel;
import java.awt.GridBagConstraints;
import java.awt.Label;
import java.awt.Panel;

/**
 * Main.java
 *  Swing and AWT Component test
 * 
 * @author finky
 *
 */
public class Main extends JFrame {

 private static final long serialVersionUID = 1L;

 private JPanel jContentPane = null;

 private JMenuBar frameMenuBar = null;

 private JMenu fileMenu = null;

 private JMenuItem openMenuItem = null;

 private JTabbedPane jTabbedPane = null;

 private JPanel jPanel = null;

 private JLabel jLabel = null;

 private JMenuItem exitMenuItem = null;

 private JPanel jPanel1 = null;

 private Panel panel = null;

 private Label label = null;

 /**
  * This method initializes frameMenuBar 
  *  
  * @return javax.swing.JMenuBar 
  */
 private JMenuBar getFrameMenuBar() {
  if (frameMenuBar == null) {
   frameMenuBar = new JMenuBar();
   frameMenuBar.add(getFileMenu());
  }
  return frameMenuBar;
 }

 /**
  * This method initializes fileMenu 
  *  
  * @return javax.swing.JMenu 
  */
 private JMenu getFileMenu() {
  if (fileMenu == null) {
   fileMenu = new JMenu();
   fileMenu.setText("File");
   fileMenu.setMnemonic(KeyEvent.VK_F);
   fileMenu.add(getOpenMenuItem());
   fileMenu.add(new JSeparator());
   fileMenu.add(getExitMenuItem());
  }
  return fileMenu;
 }

 /**
  * This method initializes openMenuItem 
  *  
  * @return javax.swing.JMenuItem 
  */
 private JMenuItem getOpenMenuItem() {
  if (openMenuItem == null) {
   openMenuItem = new JMenuItem();
   openMenuItem.setText("Open");
   openMenuItem.setMnemonic(KeyEvent.VK_O);
  }
  return openMenuItem;
 }

 /**
  * This method initializes jTabbedPane 
  *  
  * @return javax.swing.JTabbedPane 
  */
 private JTabbedPane getJTabbedPane() {
  if (jTabbedPane == null) {
   jTabbedPane = new JTabbedPane();
   jTabbedPane.addTab("Panel1", null, getJPanel(), null);
   jTabbedPane.addTab("Panel2", null, getJPanel1(), null);
  }
  return jTabbedPane;
 }

 /**
  * This method initializes jPanel 
  *  
  * @return javax.swing.JPanel 
  */
 private JPanel getJPanel() {
  if (jPanel == null) {
   GridBagConstraints gridBagConstraints = new GridBagConstraints();
   gridBagConstraints.gridx = 0;
   gridBagConstraints.anchor = GridBagConstraints.NORTHWEST;
   gridBagConstraints.weighty = 1.0;
   gridBagConstraints.weightx = 1.0;
   gridBagConstraints.gridy = 0;
   jLabel = new JLabel();
   jLabel.setText("This is JPanel");
   jPanel = new JPanel();
   jPanel.setLayout(new GridBagLayout());
   jPanel.add(jLabel, gridBagConstraints);
  }
  return jPanel;
 }

 /**
  * This method initializes exitMenuItem 
  *  
  * @return javax.swing.JMenuItem 
  */
 private JMenuItem getExitMenuItem() {
  if (exitMenuItem == null) {
   exitMenuItem = new JMenuItem();
   exitMenuItem.setText("Exit");
   exitMenuItem.setMnemonic(KeyEvent.VK_X);
   exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
     System.out.println("actionPerformed()"); // TODO Auto-generated Event stub actionPerformed()
     dispose();
    }
   });
  }
  return exitMenuItem;
 }

 /**
  * This method initializes jPanel1 
  *  
  * @return javax.swing.JPanel 
  */
 private JPanel getJPanel1() {
  if (jPanel1 == null) {
   GridBagConstraints gridBagConstraints1 = new GridBagConstraints();
   gridBagConstraints1.gridx = 0;
   gridBagConstraints1.fill = GridBagConstraints.BOTH;
   gridBagConstraints1.weightx = 1.0;
   gridBagConstraints1.weighty = 1.0;
   gridBagConstraints1.gridy = 0;
   jPanel1 = new JPanel();
   jPanel1.setLayout(new GridBagLayout());
   jPanel1.add(getPanel(), gridBagConstraints1);
  }
  return jPanel1;
 }

 /**
  * This method initializes panel 
  *  This panel hides Menus.
  * @return java.awt.Panel 
  */
 private Panel getPanel() {
  if (panel == null) {
   GridBagConstraints gridBagConstraints2 = new GridBagConstraints();
   gridBagConstraints2.weightx = 1.0;
   gridBagConstraints2.anchor = GridBagConstraints.NORTHWEST;
   gridBagConstraints2.weighty = 1.0;
   label = new Label();
   label.setText("This is Panel on JPanel");
   panel = new Panel();
   panel.setLayout(new GridBagLayout());
   panel.add(label, gridBagConstraints2);
  }
  return panel;
 }

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  SwingUtilities.invokeLater(new Runnable() {
   public void run() {
    Main thisClass = new Main();
    thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    thisClass.setVisible(true);
   }
  });
 }

 /**
  * This is the default constructor
  */
 public Main() {
  super();
  initialize();
 }

 /**
  * This method initializes this
  * 
  * @return void
  */
 private void initialize() {
  this.setSize(300, 200);
  this.setJMenuBar(getFrameMenuBar());
  this.setContentPane(getJContentPane());
  this.setTitle("Swing Test");
 }

 /**
  * This method initializes jContentPane
  * 
  * @return javax.swing.JPanel
  */
 private JPanel getJContentPane() {
  if (jContentPane == null) {
   jContentPane = new JPanel();
   jContentPane.setLayout(new BorderLayout());
   jContentPane.add(getJTabbedPane(), BorderLayout.CENTER);
  }
  return jContentPane;
 }

}