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/* BasicRadioButtonUI.java

   Copyright (C) 2002, 2004 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.plaf.basic;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Rectangle;

import javax.swing.AbstractButton;

import javax.swing.Icon;

import javax.swing.JComponent;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import javax.swing.plaf.ComponentUI;

/**

 * The BasicLookAndFeel UI implementation for

 * {@link javax.swing.JRadioButton}s.

 */

public class BasicRadioButtonUI extends BasicToggleButtonUI

{

  /**

   * The default icon for JRadioButtons. The default icon displays the usual

   * RadioButton and is sensible to the selection state of the button,

   * and can be used both as normal icon as well as selectedIcon.

   */

  protected Icon icon;

  /**

   * Creates and returns a new instance of <code>BasicRadioButtonUI</code>.

   *

   * @return a new instance of <code>BasicRadioButtonUI</code>

   */

  public static ComponentUI createUI(final JComponent c)  {

    return new BasicRadioButtonUI();

  }

  /**

   * Creates a new instance of <code>BasicButtonUI</code>.

   */

  public BasicRadioButtonUI()

  {

    icon = getDefaultIcon();

  }

  /**

   * Installs defaults from the Look & Feel table on the specified

   * button.

   *

   * @param b the button on which to install the defaults

   */

  protected void installDefaults(AbstractButton b)

  {

    super.installDefaults(b);

    if (b.getIcon() == null)

      b.setIcon(icon);

    if (b.getSelectedIcon() == null)

      b.setSelectedIcon(icon);

    if (b.getDisabledIcon() == null)

      b.setDisabledIcon(icon);

    if (b.getDisabledSelectedIcon() == null)

      b.setDisabledSelectedIcon(icon);

  }

  /**

   * Returns the prefix used for UIDefaults properties. This is

   * <code>RadioButton</code> in this case.

   *

   * @return the prefix used for UIDefaults properties

   */

  protected String getPropertyPrefix()

  {

    return "RadioButton.";

  }

  /**

   * Returns the default icon for JRadioButtons.

   * The default icon displays the usual

   * RadioButton and is sensible to the selection state of the button,

   * and can be used both as normal icon as well as selectedIcon.

   *

   * @return the default icon for JRadioButtons

   */

  public Icon getDefaultIcon()

  {

    return UIManager.getIcon(getPropertyPrefix() + "icon");

  }

  /**

   * Paints the RadioButton.

   *

   * @param g the Graphics context to paint with

   * @param c the button to paint

   */

  public void paint(Graphics g, JComponent c)

  {

    AbstractButton b = (AbstractButton) c;

    Rectangle tr = new Rectangle();

    Rectangle ir = new Rectangle();

    Rectangle vr = new Rectangle();

    Font f = c.getFont();

    g.setFont(f);

    Icon currentIcon = null;

    if (b.isSelected() && b.isEnabled())

      currentIcon = b.getSelectedIcon();

    else if (!b.isSelected() && b.isEnabled())

      currentIcon = b.getIcon();

    else if (b.isSelected() && !b.isEnabled())

      currentIcon = b.getDisabledSelectedIcon();

    else // (!b.isSelected() && !b.isEnabled())

      currentIcon = b.getDisabledIcon();

    SwingUtilities.calculateInnerArea(b, vr);

    String text = SwingUtilities.layoutCompoundLabel

      (c, g.getFontMetrics(f), b.getText(), currentIcon,

       b.getVerticalAlignment(), b.getHorizontalAlignment(),

       b.getVerticalTextPosition(), b.getHorizontalTextPosition(),

       vr, ir, tr, b.getIconTextGap() + defaultTextShiftOffset);

    if (currentIcon != null)

      {

        currentIcon.paintIcon(c, g, ir.x, ir.y);

      }

    if (text != null)

      paintText(g, b, tr, text);

    // TODO: Figure out what is the size parameter?

    if (b.hasFocus() && b.isFocusPainted() && b.isEnabled())

      paintFocus(g, tr, null);

  }

  /**

   * Paints the focus indicator for JRadioButtons.

   *

   * @param g the graphics context

   * @param tr the rectangle for the text label

   * @param size the size (??)

   */

  // TODO: Figure out what for is the size parameter.

  protected void paintFocus(Graphics g, Rectangle tr, Dimension size)

  {

    Color focusColor = UIManager.getColor(getPropertyPrefix() + ".focus");

    Color saved = g.getColor();

    g.setColor(focusColor);

    g.drawRect(tr.x, tr.y, tr.width, tr.height);

    g.setColor(saved);

  }

}