tabbedpanedemo.java

电子工业出版社出版的《java2应用开发指南》配套光盘源代码

// TabbedPaneDemo.java
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;

public class TabbedPaneDemo extends JFrame implements ActionListener
{
	private ImageIcon m_tabimage;
	private ImageIcon m_tab1;
	private ImageIcon m_tab2;
	private ImageIcon m_tab3;
	private JTabbedPane m_tabbedPane;
	private JButton m_topButton;
	private JButton m_bottomButton;
	private JButton m_leftButton;
	private JButton m_rightButton;
	private JButton m_addButton;
	private JButton m_removeButton;
	
	public TabbedPaneDemo()
	{	
		//创建选项卡的图标
		m_tabimage = new ImageIcon("tabimage.gif");
		//创建三个图标
		m_tab1 = new ImageIcon("1.gif");
		m_tab2 = new ImageIcon("2.gif");
		m_tab3 = new ImageIcon("3.gif");
		//＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
		// 下面是功能按钮面板的创建过程
		//＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
		JPanel buttonPanel = new JPanel();
		buttonPanel.setLayout(new GridLayout(1,6));
		m_topButton = new JButton("顶部");
		m_bottomButton = new JButton("底部");
		m_leftButton = new JButton("左边");
		m_rightButton = new JButton("右边");
		m_addButton = new JButton("添加选项卡");
		m_removeButton = new JButton("删除选项卡");		
		//添加事件监听器
		m_topButton.addActionListener(this);
		m_bottomButton.addActionListener(this);
		m_leftButton.addActionListener(this);
		m_rightButton.addActionListener(this);
		m_addButton.addActionListener(this);
		m_removeButton.addActionListener(this);
		//把四个功能按钮加入功能按钮面板中
		buttonPanel.add(m_topButton);
		buttonPanel.add(m_bottomButton);
		buttonPanel.add(m_leftButton);
		buttonPanel.add(m_rightButton);
		buttonPanel.add(m_addButton);
		buttonPanel.add(m_removeButton);
		
		//把选项卡窗格容器和功能按钮面板加入到内容窗格容器中
		m_tabbedPane = new JTabbedPane(SwingConstants.TOP);
		getContentPane().add("South", buttonPanel);
		getContentPane().add("Center", m_tabbedPane);
		
		//创建三个选项卡
		createTab();
		createTab();
		createTab();
		//设置显示第一个选项卡
		m_tabbedPane.setSelectedIndex(0);
	}
	//创建选项卡
	public void createTab() 
	{
		JLabel label = null;
		switch (m_tabbedPane.getTabCount()%3) {
		case 0:
			label = new JLabel("Tab #" + m_tabbedPane.getTabCount(), 
		  	m_tab1, SwingConstants.CENTER);
		break;
		case 1: 
			label = new JLabel("Tab #" + m_tabbedPane.getTabCount(), 
			  m_tab2, SwingConstants.CENTER);
		break;
		case 2: 
			label = new JLabel("Tab #" + m_tabbedPane.getTabCount(), 
			m_tab3, SwingConstants.CENTER);
		break;
		}
		label.setVerticalTextPosition(SwingConstants.BOTTOM);
		label.setHorizontalTextPosition(SwingConstants.CENTER);
		label.setOpaque(true);
		label.setBackground(Color.white);
		//把新创建的选项卡添加到选项卡容器中
		m_tabbedPane.addTab("Tab #" + m_tabbedPane.getTabCount(), m_tabimage, label);
	}
	//删除选项卡
	public void deleteTab() 
	{
		//删除最后一个选项卡
		if (m_tabbedPane.getTabCount() > 0) 
			m_tabbedPane.removeTabAt(m_tabbedPane.getTabCount()-1);
	}
	//处理按钮事件
	public void actionPerformed(ActionEvent e) 
	{
		if (e.getSource() == m_topButton) 
			m_tabbedPane.setTabPlacement(SwingConstants.TOP);
		else if(e.getSource() == m_bottomButton) 
			m_tabbedPane.setTabPlacement(SwingConstants.BOTTOM);
		else if(e.getSource() == m_leftButton) 
			m_tabbedPane.setTabPlacement(SwingConstants.LEFT);		
		else if(e.getSource() == m_rightButton)
			m_tabbedPane.setTabPlacement(SwingConstants.RIGHT);
		else if(e.getSource() == m_addButton)
			createTab();
		else if(e.getSource() == m_removeButton)
			deleteTab();
		//重新绘制选项卡容器
		m_tabbedPane.revalidate();
		m_tabbedPane.repaint();	
	}
	//程序的入口方法
	public static void main(String[] args) {
		TabbedPaneDemo frame=new TabbedPaneDemo();
		//设置框架窗体的事件监听(关闭窗体事件)
		frame.addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});		
		//显示框架窗体
		frame.pack();
		frame.show();
	}
}