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/* BasicComboBoxRenderer.java --

   Copyright (C) 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.plaf.basic;

import java.awt.Component;

import java.awt.Dimension;

import java.io.Serializable;

import javax.swing.Icon;

import javax.swing.JComboBox;

import javax.swing.JLabel;

import javax.swing.JList;

import javax.swing.ListCellRenderer;

import javax.swing.border.Border;

import javax.swing.border.EmptyBorder;

/**

 * A renderer for a {@link JComboBox}.

 *

 * @author Olga Rodimina

 */

public class BasicComboBoxRenderer

  extends JLabel

  implements ListCellRenderer, Serializable

{

  /**

   * A shared border instance for all renderers.

   */

  protected static Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);

  /**

   * Creates a new <code>BasicComboBoxRenderer</code> object.

   */

  public BasicComboBoxRenderer()

  {

    setOpaque(true);

    setBorder(noFocusBorder);

  }

  /**

   * Returns preferredSize of the renderer

   *

   * @return preferredSize of the renderer

   */

  public Dimension getPreferredSize()

  {

    if (this.getText() != null && ! this.getText().equals(""))

      return super.getPreferredSize();

    else

      {

        // If the combo box option's text is empty or null, it won't size

        // properly (ie, it'll be way too short)... so we throw in a dummy

        // space to trick the superclass's sizing methods.

        String oldText = this.getText();

        this.setText(" ");

        Dimension d = super.getPreferredSize();

        this.setText(oldText);

        return d;

      }

  }

  /**

   * Returns a component that has been configured to display the given

   * <code>value</code>.

   *

   * @param list List of items for which to the background and foreground

   *        colors

   * @param value object that should be rendered in the cell

   * @param index index of the cell in the list of items.

   * @param isSelected draw cell highlighted if isSelected is true

   * @param cellHasFocus draw focus rectangle around cell if the cell has

   *        focus

   *

   * @return Component that will be used to draw the desired cell.

   */

  public Component getListCellRendererComponent(JList list, Object value,

                                                int index, boolean isSelected,

                                                boolean cellHasFocus)

  {

    if (isSelected)

      {

        setBackground(list.getSelectionBackground());

        setForeground(list.getSelectionForeground());

      }

    else

      {

        setBackground(list.getBackground());

        setForeground(list.getForeground());

      }

    setFont(list.getFont());

    if (value instanceof Icon)

      setIcon((Icon) value);

    else

      setText(value == null ? "" : value.toString());

    return this;

  }

  /**

   * A subclass of {@link BasicComboBoxRenderer} that implements the

   * {@link javax.swing.plaf.UIResource} interface.

   */

  public static class UIResource extends BasicComboBoxRenderer

    implements javax.swing.plaf.UIResource

  {

    /**

     * Creates a new <code>UIResource</code> object.

     */

    public UIResource()

    {

      // Nothing to do here.

    }

  }

}