/*

     dsh-layout  Layout managers for lightweight components.

     Copyright (c) 2003-2012 held jointly by the individual authors.

     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 3 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; with out 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.

     > http://www.fsf.org/licensing/licenses/lgpl.html

     > http://www.opensource.org/licenses/lgpl-license.php

 */

 package org.dishevelled.layout;

 import java.awt.Component;

 import javax.swing.Action;

 import javax.swing.Box;

 import javax.swing.JButton;

 import javax.swing.JPanel;

 /**

  * Button panel.

  *

  * @author  Michael Heuer

  * @version $Revision$ $Date$

  */

 public final class ButtonPanel

     extends JPanel

 {

     /** Default button spacing, <code>10</code>. */

     private static final int DEFAULT_BUTTON_SPACING = 10;

     /**

      * Create a new button panel.

      */

     public ButtonPanel()

     {

         super();

         setLayout(new ButtonLayout(this));

     }

     /**

      * Add spacing.

      */

     private void addSpacing()

     {

         int buttonCount = 0;

         //for (Component component : getComponents())

         for (int i = 0, size = getComponentCount(); i < size; i++)

         {

             Component component = getComponent(i);

             if (component instanceof JButton)

             {

                 buttonCount++;

             }

         }

         if (buttonCount == 0)

         {

             super.add(Box.createHorizontalGlue());

             super.add(Box.createHorizontalGlue());

         }

         else

         {

             int buttonSpacing = DEFAULT_BUTTON_SPACING; // todo:  look up in L&F docs

             super.add(Box.createHorizontalStrut(buttonSpacing));

         }

     }

     /**

      * Add the specified button to this button panel.

      *

      * @param button button to add

      * @return a reference to the added button

      */

     public JButton add(final JButton button)

     {

         addSpacing();

         return (JButton) super.add(button);

     }

     /**

      * Create a new JButton for the specified action and add it to this button panel.

      *

      * @param action action

      * @return a new JButton for the specified action

      */

     public JButton add(final Action action)

     {

         addSpacing();

         JButton button = new JButton(action);

         return (JButton) super.add(button);

     }

     // other considerations:

     // minimum button width

     // set the default button

     // adjust left-to-right orientation of default button based on L&F

 }