package swingExamples;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GraphicsEnvironment;

import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class JListFontSelector2 extends JFrame
{
  public JListFontSelector2()
  {
    setTitle("JListFontSelector2");
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    getContentPane().add( new JListFontPanel() );
    pack();
  }
  
  //// Inner classes ////
  class JListFontPanel extends JPanel 
      implements ListSelectionListener
  {
    JListFontPanel()
    {
      setLayout( new BorderLayout() );
      
      JPanel listPanel = new JPanel();
      m_list.setSelectedIndex(0);
      m_list.setCellRenderer( new FontRenderer() );
      m_list.addListSelectionListener(this);
      listPanel.add( new JScrollPane(m_list) );
      add(listPanel, BorderLayout.SOUTH);
      
      JPanel fontPanel = new JPanel();
      fontPanel.setPreferredSize( new Dimension(500, 50) );
      fontPanel.setBackground(Color.WHITE);
      fontPanel.setBorder( 
          BorderFactory.createCompoundBorder(
            BorderFactory.createEmptyBorder(5, 5, 5, 5),
            BorderFactory.createLineBorder(Color.BLUE) 
            ) );
      String fontName = 
          (String) m_list.getSelectedValue();
      m_fontLabel.setFont( 
          new Font(fontName, Font.PLAIN, 16) );
      fontPanel.add(m_fontLabel);
      add(fontPanel, BorderLayout.NORTH);
    }
    
    public void valueChanged(ListSelectionEvent e)
    {
      JList source = (JList) e.getSource();
      String fontName = (String) source.getSelectedValue();
      m_fontLabel.setFont( 
          new Font(fontName, Font.PLAIN, 16) );
    }
    
    private JList  m_list = new JList(FONT_NAMES);
    private JLabel m_fontLabel = 
        new JLabel(
        "The quick brown fox jumps over the lazy dog");
  }
  
  private static final String[] FONT_NAMES =
      GraphicsEnvironment.getLocalGraphicsEnvironment()
                         .getAvailableFontFamilyNames();
  
  /**
   * Main entry point for program
   */
  public static void main(String[] args)
  {
    JListFontSelector2 frame = new JListFontSelector2();
    frame.setVisible(true);
  }
}

package swingExamples;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.ListCellRenderer;

public class FontRenderer extends JPanel 
    implements ListCellRenderer
{
  public Component getListCellRendererComponent(
      JList list,
      Object value,
      int index,
      boolean isSelected,
      boolean cellHasFocus
      )
  {
    String fontName = (String) value;
    // Set a tooltip on this panel for the font name
    setToolTipText(fontName);
    
    m_font = new Font(fontName, Font.PLAIN, 14);
    m_background = isSelected ? 
      list.getSelectionBackground() : list.getBackground();
    m_foreground = isSelected ? 
      list.getSelectionForeground() : list.getForeground();
    return this;
  }
  
  public void paintComponent(Graphics g)
  {
    String text = m_font.getFamily();
    FontMetrics fm = g.getFontMetrics(m_font);
    g.setColor(m_background);
    g.fillRect(0, 0, getWidth(), getHeight());
    g.setColor(m_foreground);
    g.setFont(m_font);
    g.drawString(text, 0, fm.getAscent());
  }
  
  public Dimension getPreferredSize()
  {
    String text = m_font.getFamily();
    Graphics g = getGraphics();
    FontMetrics fm = g.getFontMetrics(m_font);
    return new Dimension(
        fm.stringWidth(text), fm.getHeight());
  }
  
  /// Private data ///
  private Font m_font;
  private Color m_background;
  private Color m_foreground;
}