Swing/Preferences のバックアップの現在との差分(No.11)

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public MainPanel(JFrame frame) {
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  super(new BorderLayout());
  this.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
  this.prefs = Preferences.userNodeForPackage(getClass());
  frame.addWindowListener(new WindowAdapter() {
    @Override public void windowClosing(WindowEvent e) {
      saveLocation();
      e.getWindow().dispose();
    }
  });
  frame.addComponentListener(new ComponentAdapter() {
    @Override public void componentMoved(ComponentEvent e) {
      JFrame frame = (JFrame) e.getComponent();
      if (frame.getExtendedState() == Frame.NORMAL) {
        Point pt = frame.getLocationOnScreen();
        if (pt.x < 0 || pt.y < 0) {
          return;
        }
        try {
          pos.setLocation(pt);
        } catch (IllegalComponentStateException icse) {
          icse.printStackTrace();
        }
      }
    }

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//#screenshot
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    @Override public void componentResized(ComponentEvent e) {
      JFrame frame = (JFrame) e.getComponent();
      if (frame.getExtendedState() == Frame.NORMAL) {
        dim.setSize(getSize());
      }
    }
  });
  Box box = Box.createHorizontalBox();
  box.add(Box.createHorizontalGlue());
  box.add(clearButton);
  box.add(Box.createHorizontalStrut(2));
  box.add(exitButton);
  add(new JLabel("TEST"));
  add(box, BorderLayout.SOUTH);
  int wdim = prefs.getInt(PREFIX + "dimw", dim.width);
  int hdim = prefs.getInt(PREFIX + "dimh", dim.height);
  dim.setSize(wdim, hdim);
  setPreferredSize(dim);
  Rectangle screen = frame.getGraphicsConfiguration().getBounds();
  pos.setLocation(screen.x + screen.width / 2 - dim.width / 2,
                  screen.y + screen.height / 2 - dim.height / 2);
  int xpos = prefs.getInt(PREFIX + "locx", pos.x);
  int ypos = prefs.getInt(PREFIX + "locy", pos.y);
  pos.setLocation(xpos, ypos);
  frame.setLocation(pos.x, pos.y);
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}
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**サンプルコード [#o43d0c70]
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 public abstract class AbstractHogePanel extends JPanel{
   final private Point     pos = new Point(0, 0);
   final private Dimension dim = new Dimension(900, 800);
   private JFrame frame;
   
   public AbstractHogePanel() {
     super();
     frame = new JFrame();
     frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
     frame.addWindowListener(new java.awt.event.WindowAdapter() {
       public void windowClosing(WindowEvent e) {
         exitActionPerformed(null);
       }
     });
     frame.addComponentListener(new ComponentAdapter() {
       public void componentMoved(ComponentEvent e) {
         JFrame frm = (JFrame)e.getSource();
         if(frm.getExtendedState()==JFrame.NORMAL) {
           try{
             pos.setLocation(frm.getLocationOnScreen());
           }catch(IllegalComponentStateException icse) {}
         }
       }
       public void componentResized(ComponentEvent e) {
         JFrame frm = (JFrame)e.getSource();
         if(frm.getExtendedState()==JFrame.NORMAL) {
           dim.setSize(getSize());
         }
       }
       //void componentHidden(ComponentEvent e) {}
       //void componentShown(ComponentEvent e)
     });
   }
   
   private String prefix = "";
   protected void setPrefix(String str) {
     str = str.toLowerCase().trim();
     if(str!=null && str.length()>0) {
       prefix = str+"_";
     }
   }
   protected void initLocation(Preferences lprefs) {
     int xpos = lprefs.getInt(prefix+"locx", pos.x);
     int ypos = lprefs.getInt(prefix+"locy", pos.y);
     pos.setLocation(xpos,ypos);
     getFrame().setLocation(pos.x, pos.y);
     int wdim = lprefs.getInt(prefix+"dimw", dim.width);
     int hdim = lprefs.getInt(prefix+"dimh", dim.height);
     dim.setSize(wdim, hdim);
     this.setPreferredSize(dim);
   }
   protected void saveLocation(Preferences lprefs) {
     lprefs.putInt(prefix+"locx", pos.x);
     lprefs.putInt(prefix+"locy", pos.y);
     lprefs.putInt(prefix+"dimw", dim.width);
     lprefs.putInt(prefix+"dimh", dim.height);
     try{
       lprefs.flush();
     }catch(java.util.prefs.BackingStoreException e) {
       Logger.global.info("バッキングストアに障害が発生したか、
       バッキングストアにアクセスできないことが原因で、設定操作を完了
       できなかった。");
     }
   }
   public JFrame getFrame() {
     return frame;
   }
   
   public void showPanel() {
     if(getFrame()!=null) {
       JFrame f = getFrame();
       f.setExtendedState(JFrame.NORMAL);
       f.getContentPane().add(this, BorderLayout.CENTER);
       f.pack();
       f.show();
     }
   }
   
   protected class ExitAction extends AbstractAction{
     public ExitAction() {
       super("exit");
     }
     public void actionPerformed(ActionEvent evt) {
       exitActionPerformed(evt);
     }
   }
   abstract public void exitActionPerformed(ActionEvent e);
 }
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private void saveLocation() {
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  prefs.putInt(PREFIX + "locx", pos.x);
  prefs.putInt(PREFIX + "locy", pos.y);
  prefs.putInt(PREFIX + "dimw", dim.width);
  prefs.putInt(PREFIX + "dimh", dim.height);
  try {
    prefs.flush();
  } catch (BackingStoreException e) {
    e.printStackTrace();
  }
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}
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