content: /* ========================================================================
   * JCommon : a free general purpose class library for the Java(tm) platform
   * ========================================================================
   *
   * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   * 
   * Project Info:  http://www.jfree.org/jcommon/index.html
   *
   * This library is free software; you can redistribute it and/or modify it 
   * under the terms of the GNU Lesser General Public License as published by 
   * the Free Software Foundation; either version 2.1 of the License, or 
   * (at your option) any later version.
   *
   * This library 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 Lesser General Public 
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
   * USA.  
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
   * in the United States and other countries.]
   * 
   * -----------------
   * DetailEditor.java
   * -----------------
   * (C) Copyright 2004, by Thomas Morgner and Contributors.
   *
   * Original Author:  Thomas Morgner;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * $Id: FloatingButtonEnabler.java,v 1.4 2007/11/02 17:50:36 taqua Exp $
   *
   * Changes
   * -------
   * 07-Jun-2004 : Added JCommon header (DG);
   *
   */
  
  package org.jfree.ui;
  
  import java.awt.event.MouseAdapter;
  import java.awt.event.MouseEvent;
  import javax.swing.AbstractButton;
  
  /**
   * Enables a button to have a simple floating effect. The border of the button is only visible,
   * when the mouse pointer is floating over the button.
   *
   * @author Thomas Morgner
   */
  public final class FloatingButtonEnabler extends MouseAdapter {
    
      /** A single instance. */
      private static FloatingButtonEnabler singleton;
  
      /**
       * Default constructor.
       */
      private FloatingButtonEnabler() {
          // nothing required
      }
  
      /**
       * Returns a default instance of this enabler.
       *
       * @return a shared instance of this class.
       */
      public static FloatingButtonEnabler getInstance() {
          if (singleton == null) {
              singleton = new FloatingButtonEnabler();
          }
          return singleton;
      }
  
      /**
       * Adds a button to this enabler.
       *
       * @param button  the button.
       */
      public void addButton(final AbstractButton button) {
          button.addMouseListener(this);
          button.setBorderPainted(false);
      }
  
      /**
       * Removes a button from the enabler.
       *
       * @param button  the button.
       */
      public void removeButton(final AbstractButton button) {
          button.addMouseListener(this);
          button.setBorderPainted(true);
      }
  
      /**
       * Triggers the drawing of the border when the mouse entered the button area.
       *
       * @param e  the mouse event.
       */
      public void mouseEntered(final MouseEvent e) {
          if (e.getSource() instanceof AbstractButton) {
              final AbstractButton button = (AbstractButton) e.getSource();
              if (button.isEnabled()) {
                  button.setBorderPainted(true);
              }
          }
      }
  
      /**
       * Disables the drawing of the border when the mouse leaves the button area.
       *
       * @param e  the mouse event.
       */
      public void mouseExited(final MouseEvent e) {
          if (e.getSource() instanceof AbstractButton) {
              final AbstractButton button = (AbstractButton) e.getSource();
              button.setBorderPainted(false);
              if (button.getParent() != null)
              {
  //                button.getParent().repaint(button.getX(), button.getY(),
  //                    button.getWidth(), button.getHeight());
                  button.getParent().repaint();
              }
          }
      }
  
  }
  