gcc/libjava/classpath/javax/swing/JButton.java

/* 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
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General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
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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;

  /** The AccessibleContext for this JButton. */
  AccessibleJButton accessibleContext;

  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()
  {
  }

  public void setDefaultCapable(boolean defaultCapable)
  {
    def = defaultCapable;
  }

  public void updateUI()
  {
    setUI((ButtonUI) UIManager.getUI(this));
  }
}