gcc/libjava/classpath/javax/swing/plaf/basic/BasicRadioButtonUI.java

/* BasicRadioButtonUI.java
   Copyright (C) 2002, 2004, 2006, 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.

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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
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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
executable, regardless of the license terms of these independent
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terms of your choice, provided that you also meet, for each linked
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this exception to your version of the library, but you are not
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package javax.swing.plaf.basic;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.Rectangle;

import javax.swing.AbstractButton;
import javax.swing.ButtonModel;
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 &amp; Feel table on the specified
   * button.
   *
   * @param b the button on which to install the defaults
   */
  protected void installDefaults(AbstractButton b)
  {
    super.installDefaults(b);
  }

  /**
   * 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);

    ButtonModel m = b.getModel();
    // FIXME: Do a filtering on any customized icon if the following property
    // is set.
    boolean enabled = b.isEnabled();
    
    Icon currentIcon = b.getIcon();

    if (currentIcon == null)
      {
        currentIcon = getDefaultIcon();
      }
    
    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);
    
    currentIcon.paintIcon(c, g, ir.x, ir.y);
    
    if (text != null)
      paintText(g, b, tr, text);
    if (b.hasFocus() && b.isFocusPainted() && m.isEnabled())
      paintFocus(g, tr, c.getSize());
  }
  
  public Dimension getPreferredSize(JComponent c)
  {
    // This is basically the same code as in
    // BasicGraphicsUtils.getPreferredButtonSize() but takes the default icon
    // property into account. JRadioButton and subclasses always have an icon:
    // the check box. If the user explicitly changes it with setIcon() that
    // one will be used for layout calculations and painting instead.
    // The other icon properties are ignored.
    AbstractButton b = (AbstractButton) c;
    
    Rectangle contentRect;
    Rectangle viewRect;
    Rectangle iconRect = new Rectangle();
    Rectangle textRect = new Rectangle();
    Insets insets = b.getInsets();
    
    Icon i = b.getIcon();
    if (i == null)
      i = getDefaultIcon(); 
    
    viewRect = new Rectangle();

    SwingUtilities.layoutCompoundLabel(
      b, // for the component orientation
      b.getFontMetrics(b.getFont()),
      b.getText(),
      i,
      b.getVerticalAlignment(), 
      b.getHorizontalAlignment(),
      b.getVerticalTextPosition(),
      b.getHorizontalTextPosition(),
      viewRect, iconRect, textRect,
      defaultTextIconGap + defaultTextShiftOffset);

    contentRect = textRect.union(iconRect);
    
    return new Dimension(insets.left
                         + contentRect.width 
                         + insets.right + b.getHorizontalAlignment(),
                         insets.top
                         + contentRect.height 
                         + insets.bottom);
  }

  /**
   * Paints the focus indicator for JRadioButtons.
   *
   * @param g the graphics context
   * @param tr the rectangle for the text label
   * @param size the size of the <code>JRadioButton</code> component.
   */
  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);
  }
}