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: 演示將面板分割成左右兩部分</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>方法說明:構造器,定義了所有要使用的構件
*<br>輸入參數:
*<br>返回類型:
*/
public SplitPaneDemo() {
//創建一個圖像名稱的列表,設置為單選方式
list = new JList(imageNames);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setSelectedIndex(0);
list.addListSelectionListener(this);
JScrollPane listScrollPane = new JScrollPane(list);//獲取默認的圖片
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);//創建一個水平分割的面板,定義了兩個面板的名字。
splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,
listScrollPane, pictureScrollPane);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(150);//定義面板的最小尺寸
Dimension minimumSize = new Dimension(100, 50);
listScrollPane.setMinimumSize(minimumSize);
pictureScrollPane.setMinimumSize(minimumSize);//定義初始尺寸
splitPane.setPreferredSize(new Dimension(400, 200));
}
/**
*<br>方法說明:獲得這個分割的面板
*<br>輸入參數:
*<br>返回類型:JSplitPane 對象
*/
public JSplitPane getSplitPane() {
return splitPane;
}
/**
*<br>方法說明:列表監聽事件處理
*<br>輸入參數:ListSelectionEvent e 列表選擇事件
*<br>返回類型:
*/
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 (newImage != null) {
picture.setText(null);
picture.setPreferredSize(new Dimension(newImage.getIconWidth(),
newImage.getIconHeight() ));
} else {
picture.setText("Image not found: "
+ (String)imageNames[index]);
}
picture.revalidate();
}
}
/**
*<br>方法說明:根據路徑獲取圖形對象
*<br>輸入參數:String path 圖片路徑
*<br>返回類型:ImageIcon 圖片對象
*/
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = SplitPaneDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn´t find file: " + path);
return null;
}
}
/**
*<br>方法說明:主方法
*<br>輸入參數:
*<br>返回類型:
*/
public static void main(String[] args) {
JFrame.setDefaultLookAndFeelDecorated(true);//定義窗體
JFrame frame = new JFrame("SplitPaneDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
SplitPaneDemo splitPaneDemo = new SplitPaneDemo();
frame.getContentPane().add(splitPaneDemo.getSplitPane());//顯示窗體
frame.pack();
frame.setVisible(true);
}
}