java swing中对于JList的使用（三）

 

package com.robert;import javax.swing.*;import java.awt.*;/** * Created by IntelliJ IDEA. * User: Administrator * Date: 11-11-12 * Time: 下午9:57 * To change this template use File | Settings | File Templates. */public class ListRenderingTest {    public static void main(String[] args)    {        EventQueue.invokeLater(new Runnable() {            public void run() {                JFrame frame = new ListRenderingFrame();                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                frame.setVisible(true);            }        });    }}

package com.robert;import javax.swing.*;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;import java.awt.*;import java.util.ArrayList;/** * Created by IntelliJ IDEA. * User: Administrator * Date: 11-11-12 * Time: 下午9:59 * To change this template use File | Settings | File Templates. */public class ListRenderingFrame extends JFrame {    private static final int DEFAULT_WIDHT = 400;    private static final int DEFAULT_HEIGHT = 300;    private JTextArea text;    private JList fontList;    public ListRenderingFrame()    {        setTitle("ListRenderingTest");        setSize(DEFAULT_WIDHT,DEFAULT_HEIGHT);        ArrayList<Font> fonts = new ArrayList<Font>();        final int SIZE = 24;        fonts.add(new Font("Serif", Font.PLAIN, SIZE));        fonts.add(new Font("SansSerif", Font.PLAIN, SIZE));        fonts.add(new Font("Monospaced", Font.PLAIN, SIZE));        fonts.add(new Font("Dialog", Font.PLAIN, SIZE));        fonts.add(new Font("DialogInput", Font.PLAIN, SIZE));        fontList = new JList(fonts.toArray());        fontList.setVisibleRowCount(4);        fontList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);        fontList.setCellRenderer(new FontCellRenderer());        JScrollPane scrollPane = new JScrollPane(fontList);        JPanel p = new JPanel();        p.add(scrollPane);        fontList.addListSelectionListener(new ListSelectionListener() {            public void valueChanged(ListSelectionEvent e) {                Font font = (Font)fontList.getSelectedValue();                text.setFont(font);            }        });        Container contentPane = getContentPane();        contentPane.add(p, BorderLayout.SOUTH);        text = new JTextArea("The quick brown fox jumps over the lazy dog");        text.setFont((Font)fonts.get(0));        text.setLineWrap(true);        text.setWrapStyleWord(true);        contentPane.add(text, BorderLayout.CENTER);    }}

package com.robert;import com.sun.corba.se.impl.orbutil.graph.Graph;import sun.java2d.loops.DrawGlyphListAA;import javax.swing.*;import java.awt.*;/** * Created by IntelliJ IDEA. * User: Administrator * Date: 11-11-12 * Time: 下午10:22 * To change this template use File | Settings | File Templates. */  class FontCellRenderer extends JComponent implements ListCellRenderer  {      private Font font;      private Color background;      private Color foreground;      public Component getListCellRendererComponent(JList list,Object value,int index,              boolean isSelected, boolean cellHasFocus)      {          font = (Font)value;          background = isSelected ? list.getSelectionBackground() : list.getBackground();          foreground = isSelected ? list.getSelectionForeground() : list.getForeground();          return this;      }      public void paintComponent(Graphics g)      {          String text = font.getFamily();          FontMetrics fm = g.getFontMetrics(font);          g.setColor(background);          g.fillRect(0, 0, getWidth(), getHeight());          g.setColor(foreground);          g.setFont(font);          g.drawString(text, 0, fm.getAscent());      }      public Dimension getPreferredSize()      {          String text = font.getFamily();          Graphics g = getGraphics();          FontMetrics fm = g.getFontMetrics(font);          return new Dimension(fm.stringWidth(text), fm.getHeight());      }  }