[JAVA100例]022、分割一个面板
时间:2011-01-09
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
/**
* <p>Title: 分割面板</p>
* <p>Description: 演示将面板分割成左右两部分</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename:SplitPaneDemo.java </p>
* @version 1.0
*/
public class SplitPaneDemo implements ListSelectionListener {
private String[] imageNames={"Bird.gif","Cat.gif","Dog.gif","Pig.gif"};
private JLabel picture;
private JList list;
private JSplitPane splitPane;
/**
*<br>方法说明：构造器，定义了所有要使用的构件
*<br>输入参数：
*<br>返回类型：
*/
public SplitPaneDemo() {
//创建一个图像名称的列表，设置为单选方式
list = new JList(imageNames);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setSelectedIndex(0);
list.addListSelectionListener(this);
JScrollPane listScrollPane = new JScrollPane(list);
//获取默认的图片
ImageIcon firstImage = createImageIcon("images/" +
(String)imageNames[0]);
if (firstImage != null) {
picture = new JLabel(firstImage);
picture.setPreferredSize(new Dimension(firstImage.getIconWidth(),
firstImage.getIconHeight()));
} else {
picture = new JLabel((String)imageNames[0]);
}
JScrollPane pictureScrollPane = new JScrollPane(picture);
//创建一个水平分割的面板，定义了两个面板的名字。
splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,
listScrollPane, pictureScrollPane);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(150);
//定义面板的最小尺寸
Dimension minimumSize = new Dimension(100, 50);
listScrollPane.setMinimumSize(minimumSize);
pictureScrollPane.setMinimumSize(minimumSize);
//定义初始尺寸
splitPane.setPreferredSize(new Dimension(400, 200));
}
/**
*<br>方法说明：获得这个分割的面板
*<br>输入参数：
*<br>返回类型：JSplitPane 对象
*/
public JSplitPane getSplitPane() {
return splitPane;
}
/**
*<br>方法说明：列表监听事件处理
*<br>输入参数：ListSelectionEvent e 列表选择事件
*<br>返回类型：
*/
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting())
return;
JList theList = (JList)e.getSource();
if (theList.isSelectionEmpty()) {
picture.setIcon(null);
picture.setText(null);
} else {
int index = theList.getSelectedIndex();
ImageIcon newImage = createImageIcon("images/" +
(String)imageNames[index]);
picture.setIcon(newImage);
if (n
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