LAFMenu.java

/*

   LAFMenu.java

   A simple menu to change look and feel.
   
   Created: 4 April 1998


   Module By: Mike Mulvaney, mulvaney@arlut.utexas.edu

   -----------------------------------------------------------------------
            
   Ganymede Directory Management System
 
   Copyright (C) 1996-2010
   The University of Texas at Austin

   Contact information

   Author Email: ganymede_author@arlut.utexas.edu
   Email mailing list: ganymede@arlut.utexas.edu

   US Mail:

   Computer Science Division
   Applied Research Laboratories
   The University of Texas at Austin
   PO Box 8029, Austin TX 78713-8029

   Telephone: (512) 835-3200

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

package arlut.csd.JDataComponent;

import java.awt.Component;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JMenu;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

import arlut.csd.Util.StringUtils;
import arlut.csd.Util.TranslationService;

/*------------------------------------------------------------------------------
                                                                           class
                                                                         LAFMenu

------------------------------------------------------------------------------*/

/**
 * <p>This class is a simple menu which can be added to a Swing app to
 * show (and switch between) a list of installed Swing look and feel
 * themes.</p>
 */

public class LAFMenu extends JMenu implements ActionListener
{
  public static boolean debug = false;

  /**
   * TranslationService object for handling string localization in the
   * Ganymede client.
   */

  static final TranslationService ts = TranslationService.getTranslationService("arlut.csd.JDataComponent.LAFMenu");

  // --

  JsetValueCallback my_parent;
  boolean allowCallback = false;

  Container root = null;

  public LAFMenu(Container root)
  {
    // "Look"
    this(root, ts.l("init.default_menu_name"));
  }

  public LAFMenu(Container root, String title)
  {
    super(title);

    if (debug)
      {
        System.out.println("Current look and feel: " + UIManager.getLookAndFeel().getName());
      }

    this.root = root;

    ButtonGroup group = new ButtonGroup();

    UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels();

    for (int i = 0; i < info.length; i++)
      {
        JCheckBoxMenuItem mi = new JCheckBoxMenuItem(info[i].getName());
        mi.setActionCommand(info[i].getClassName());

        if (debug)
          {
            System.out.println(info[i].getClassName());
          }

        group.add(mi);
        //mi.setEnabled(info[i].isSupportedLookAndFeel());
        mi.addActionListener(this);
        add(mi);
      }

    updateMenu();
  }

  /**
   * <p>This method is used to register a severely old-school
   * Ganymede-style pre-JDK 1.1 callback so that this code can cause
   * the Ganymede code base to throw up an error dialog if an attempt
   * to change the look and feel using this menu fails.</p>
   */

  public void setCallback(JsetValueCallback parent)
  {
    if (parent == null)
      {
        throw new IllegalArgumentException("Invalid Parameter: parent cannot be null");
      }
    
    my_parent = parent;

    allowCallback = true;
  }

  public void setLAF(String look)
  {
    try 
      {
        UIManager.setLookAndFeel(look);

        if (root != null)
          {
            root.invalidate();
            SwingUtilities.updateComponentTreeUI(root);
            
            if (allowCallback)
              {
                my_parent.setValuePerformed(new JSetValueObject(this, look));
              }

            root.validate();
          }
      } 
    catch (javax.swing.UnsupportedLookAndFeelException e)
      {
        if (allowCallback)
          {
            try
              {
                // "Sorry, that look and feel is unsupported on this platform."
                my_parent.setValuePerformed(new JErrorValueObject(this,
                                                                  ts.l("setLAF.unsupported")));
              }
            catch (java.rmi.RemoteException rx)
              {
              }
          }
      }
    catch (Exception e)
      {
      }
    finally
      {
        updateMenu();
      }
  }
  
  public void actionPerformed(ActionEvent e)
  {
    String current = UIManager.getLookAndFeel().toString();

    if (StringUtils.stringEquals(current, e.getActionCommand()))
      {
        if (debug)
          {
            System.out.println("Attempt to change to current LAF, I see your trick!");
          }

        return;
      }
    
    try
      {
        setLAF(e.getActionCommand());
      }
    catch (Exception ex)
      {
        if (debug)
          {
            System.out.println("Something went wrong switching look and feels: " + ex);
          }
        
        updateMenu();
      }
  }

  public void updateMenu()
  {
    String current = UIManager.getLookAndFeel().toString().toLowerCase();
    
    Component[] items = getMenuComponents();

    for (int i = 0; i < items.length; i++)
      {
        JCheckBoxMenuItem mi = (JCheckBoxMenuItem)items[i];
        String text = mi.getActionCommand().toLowerCase();

        if (current.indexOf(text) > -1)
          {
            mi.setSelected(true);
            break;
          }
        else
          {
            mi.setSelected(false);
          }
      }
  }
}