ControlPageManager.java

package org.freehep.application.mdi;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Point;

import javax.swing.Icon;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JTabbedPane;

import org.freehep.application.Application;
import org.freehep.swing.popup.HasPopupItems;

/**
 * A TabbedPageManager that only shows its tabs when there is more than one page.
 * This is the default PageManager used by the control and console areas.
 * @author Tony Johnson (tonyj@slac.stanford.edu)
 * @version $Id: ControlPageManager.java 8584 2006-08-10 23:06:37Z duns $
 */
public class ControlPageManager extends TabbedPageManager
{
   /** Creates new ControlPageManager */
   public ControlPageManager()
   {
      setTabPlacement(JTabbedPane.BOTTOM);
   }
   protected Component getEmbodiment()
   {
      return top;
   }
   protected boolean close(PageContext page)
   {
      boolean ok = super.close(page);
      if (!ok) return ok;
      int nPages = getPageCount();
      if (nPages == 1)
      {
         justOne = tabs.getComponentAt(0);
         tabs.putClientProperty("__index_to_remove__",null); // Work around for java bug 5022375 
         tabs.setComponentAt(0,new JPanel()); // just a placeholder
         justOne.setVisible(true);
         top.remove(tabs);
         top.add(justOne,BorderLayout.CENTER);
         top.revalidate();
      }
      else if (nPages == 0)
      {
         top.remove(justOne);
         justOne = null;
         top.revalidate();
      }
      return ok;
   }
   public PageContext openPage(Component c,String title,Icon icon, String type)
   {
      PageContext context = super.openPage(c, title, icon, type);
      int nPages = getPageCount();
      if (nPages == 1)
      {
         tabs.setComponentAt(0,new JPanel()); // just a placeholder
         justOne = c;
         c.setVisible(true);
         top.add(justOne,BorderLayout.CENTER);
         top.revalidate();
      }
      else if (nPages == 2)
      {
         top.remove(justOne);
         tabs.putClientProperty("__index_to_remove__",null);
         tabs.setComponentAt(0,justOne);
         justOne = null;
         Application.updateComponentTreeUI(tabs); // In case look and feel changed
         top.add(tabs);
         top.revalidate();
         top.repaint(); // Fixes JAS-161 (but why exactly? See http://www.eos.dk/archive/swing/msg02250.html)
      }
      return context;
   }
   protected int indexOfPage(PageContext page)
   {
      if (page.getPage() == justOne) return 0;
      else return super.indexOfPage(page);
   }
   
   protected void show(PageContext page)
   {
      if (getPageCount() > 1) super.show(page);
   }

   protected class InternalPanel extends JPanel implements HasPopupItems
   {
       InternalPanel() {
           super( new BorderLayout() );
       }
      public JPopupMenu modifyPopupMenu(JPopupMenu menu, Component source, Point p) {
          if ( ControlPageManager.this.getPageCount() == 1 )
              return ControlPageManager.this.modifyPopupMenu(menu, source,  p);
          else
              return menu;          
      }
      
   }
   
   
   private JPanel top = new InternalPanel();
   private Component justOne;
}