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Java Code

Main.java

/**
 * Main.java
 * Created by Stijn Strickx on May 7, 2008
 */

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;

public class Main {
    
    private static JTree tree;

    public static void main(String[] args) {
        JFrame frame = new JFrame();        
        JLabel fontLabel = new JLabel();
        fontLabel.setHorizontalAlignment(JLabel.CENTER);
        tree = new JTree(new FontTreeModel());
        tree.setCellRenderer(new FontCellRenderer());
        tree.addTreeSelectionListener(new FontTreeListener(fontLabel));
        JScrollPane scrollPane = new JScrollPane(tree);
        JPanel panel = new JPanel();
        panel.setPreferredSize(new Dimension(600,300));
        panel.setLayout(new BorderLayout());
        panel.add(fontLabel, BorderLayout.CENTER);
        Container cp = frame.getContentPane();
        cp.setLayout(new BorderLayout());
        cp.add(scrollPane,BorderLayout.WEST);
        cp.add(panel,BorderLayout.EAST);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

FontTreeModel.java

/**
 * FontTreeModel.java
 * Created by Stijn Strickx on May 7, 2008
 */

import java.awt.Font;
import java.awt.GraphicsEnvironment;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;

public class FontTreeModel implements TreeModel{
    
    private Font[] fonts;
    private int[] styles;
    
    public FontTreeModel(){
        fonts  = GraphicsEnvironment.getLocalGraphicsEnvironment().getAllFonts();
        styles = new int[4];
        styles[0] = Font.PLAIN;
        styles[1] = Font.BOLD;
        styles[2] = Font.ITALIC;
        styles[3] = Font.BOLD+Font.ITALIC;
    }

    public Object getRoot() {
        return GraphicsEnvironment.getLocalGraphicsEnvironment();
    }

    public Object getChild(Object o, int i) {
        if(o instanceof GraphicsEnvironment){
            return fonts[i];
        }
        else{
            return new StyledFont(((Font)o).getName(),styles[i],10);  
        }
    }

    public int getChildCount(Object o) {
        if(o instanceof GraphicsEnvironment){
            return fonts.length;
        }
        else{
            return styles.length;
        }
    }

    public boolean isLeaf(Object o) {
        return !(o instanceof GraphicsEnvironment || (!(o instanceof StyledFont) && o instanceof Font));
    }

    public void valueForPathChanged(TreePath t, Object o) {
        //
    }

    public int getIndexOfChild(Object o1, Object o2) {
        int index = 0;
        if(o1 instanceof GraphicsEnvironment){
            for(int i=0;i
FontTreeListener.java
/**
 * FontTreeListener.java
 * Created by Stijn Strickx on May 7, 2008
 */

import java.awt.Font;
import javax.swing.JLabel;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.TreePath;

class FontTreeListener implements TreeSelectionListener{
    
    private JLabel fontLabel;

    public FontTreeListener(JLabel fontLabel) {
        this.fontLabel = fontLabel;
    }

    public void valueChanged(TreeSelectionEvent e) {
        TreePath path = ((JTree)e.getSource()).getSelectionPath();
        if(!(path == null) && (path.getLastPathComponent() instanceof Font)){
            Font value = (Font)path.getLastPathComponent();
            fontLabel.setFont(value.deriveFont(25f));
            fontLabel.setText(value.getFontName());
        }
    }
}

FontCellRenderer.java
/**
 * FontCellRenderer.java
 * Created by Stijn Strickx on May 7, 2008
 */


import java.awt.Component;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellRenderer;

public class FontCellRenderer extends DefaultTreeCellRenderer{

    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object o, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        super.getTreeCellRendererComponent(tree,o,selected,expanded,leaf,row,hasFocus);
        if(o instanceof StyledFont){
            setText(((StyledFont)o).toString());
        }
        else if(o instanceof Font){
            setIcon(new FontIcon((Font)o));
            setText(((Font)o).getFontName());
        }
        else if(o instanceof GraphicsEnvironment){
            setText("Fonts");
        }
        return this;
    }
}

StyledFont.java
/**
 * StyledFont.java
 * Created by Stijn Strickx on May 7, 2008
 */

import java.awt.Font;
import java.util.HashMap;

public class StyledFont extends Font{
    private HashMap styles;

    public StyledFont(String name, int style, int size){
        super(name,style,size);
        this.style = style;
        styles = new HashMap();
        styles.put(Font.PLAIN, "Plain");
        styles.put(Font.BOLD, "Bold");
        styles.put(Font.ITALIC, "Italic");
        styles.put(Font.BOLD+Font.ITALIC, "Bold and Italic");
    }
    @Override
    public String toString(){
        return styles.get(style);
    }
}

FontIcon.java
/**
 * FontIcon.java
 * Created by Stijn Strickx on May 7, 2008
 */

import java.awt.Component;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.Icon;

class FontIcon implements Icon{
    
    private Font font;
    private int size;

    public FontIcon(Font font){
        this.font = font;
        size = 25;
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        Font defaultFont = g.getFont();
        g.setFont(font.deriveFont(15f));
        g.drawString("A", x, y+(size)*3/4);
        g.setFont(defaultFont);
    }

    public int getIconWidth() {
        return size;
    }

    public int getIconHeight() {
        return size;
    }

}