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/* JButton.java --

   Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)

any later version.

GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package javax.swing;

import javax.accessibility.Accessible;

import javax.accessibility.AccessibleContext;

import javax.accessibility.AccessibleRole;

import javax.swing.plaf.ButtonUI;

/**

 * A general purpose push button. <code>JButton</code>s can display a label,

 * an {@link Icon} or both.

 *

 * @author Ronald Veldema (rveldema@cs.vu.nl)

 */

public class JButton extends AbstractButton

  implements Accessible

{

  /**

   * Accessibility support for JButtons.

   */

  protected class AccessibleJButton

    extends AbstractButton.AccessibleAbstractButton

  {

    /**

     * Returns the accessible role that this component represents.

     * This is {@link AccessibleRole#PUSH_BUTTON} for <code>JButton</code>s.

     *

     * @return the accessible role that this component represents

     */

    public AccessibleRole getAccessibleRole()

    {

      return AccessibleRole.PUSH_BUTTON;

    }

  }

  private static final long serialVersionUID = -1907255238954382202L;

  boolean def;

  boolean is_def;

  public JButton()

  {

    this(null, null);

  }

  public JButton(Action a)

  {

    this();

    setAction(a);

  }

  public JButton(Icon icon)

  {

    this(null, icon);

  }

  public JButton(String text)

  {

    this(text, null);

  }

  public JButton(String text, Icon icon)

  {

    super();

    init(text, icon);

    setModel(new DefaultButtonModel());

  }

  public Object[] getSelectedObjects()

  {

    return null;

  }

  protected void configurePropertiesFromAction(Action a)

  {

    // Factory method which sets the AbstractButton's properties according to

    // values from the Action instance. 

    super.configurePropertiesFromAction(a);

  }

  public AccessibleContext getAccessibleContext()

  {

    if (accessibleContext == null)

      accessibleContext = new AccessibleJButton();

    return accessibleContext;

  }

  public String getUIClassID()

  {

    // Returns a string that specifies the name of the L&F class that renders

    // this component.  

    return "ButtonUI";

  }

  public boolean isDefaultButton()

  {

    // Returns whether or not this button is the default button on the

    // RootPane.

    return is_def;

  }

  public boolean isDefaultCapable()

  {

    // Returns whether or not this button is capable of being the default

    // button on the RootPane. 

    return def;

  }

  protected String paramString()

  {

    String superParam = super.paramString();

    // 41 is the maximum number of chars which may be needed.

    StringBuffer sb = new StringBuffer(41);

    sb.append(",defaultButton=").append(is_def);

    sb.append(",defaultCapable=").append(def);

    return superParam + sb.toString();

  }

  /**

   * Overrides JComponent.removeNotify to check if this button is currently

   * set as the default button on the RootPane, and if so, sets the RootPane's

   * default button to null to ensure the RootPane doesn't hold onto an invalid

   * button reference.

   */

  public void removeNotify()

  {

    JRootPane root = SwingUtilities.getRootPane(this);

    if (root != null && root.getDefaultButton() == this)

      root.setDefaultButton(null);

    super.removeNotify();

  }

  public void setDefaultCapable(boolean defaultCapable)

  {

    def = defaultCapable;

  }

  public void updateUI()

  {

    setUI((ButtonUI) UIManager.getUI(this));

  }

}