?? testlistrendering.java
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import java.util.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;/** * Description: * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */public class TestListRendering{ private JFrame mainWin = new JFrame("好友列表"); private String[] friends = new String[] { "李清照", "蘇格拉底", "李白", "弄玉", "虎頭" }; //定義一個JList對象 private JList friendsList = new JList(friends); public void init() { //設置該JList使用ImageCellRenderer作為單元格繪制器 friendsList.setCellRenderer(new ImageCellRenderer()); mainWin.add(new JScrollPane(friendsList)); mainWin.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); mainWin.pack(); mainWin.setVisible(true); } public static void main(String[] args) { new TestListRendering().init(); }}class ImageCellRenderer extends JPanel implements ListCellRenderer{ private ImageIcon icon; private String name; //定義繪制單元格時的背景色 private Color background; //定義繪制單元格時的前景色 private Color foreground; public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) { icon = new ImageIcon("ico/" + value + ".gif"); name = value.toString(); background = isSelected ? list.getSelectionBackground() : list.getBackground(); foreground = isSelected ? list.getSelectionForeground() : list.getForeground(); //返回該JPanel對象作為單元格繪制器 return this; } //重寫paintComponent方法,改變JPanel的外觀 public void paintComponent(Graphics g) { int imageWidth = icon.getImage().getWidth(null); int imageHeight = icon.getImage().getHeight(null); g.setColor(background); g.fillRect(0, 0, getWidth(), getHeight()); g.setColor(foreground); //繪制好友圖標 g.drawImage(icon.getImage() , getWidth() / 2 - imageWidth / 2 , 10 , null); g.setFont(new Font("SansSerif" , Font.BOLD , 18)); //繪制好友用戶名 g.drawString(name, getWidth() / 2 - name.length() * 10 , imageHeight + 30 ); } //通過該方法來設置該ImageCellRenderer的最佳大小 public Dimension getPreferredSize() { return new Dimension(60, 80); }}
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