初学者实现为JTabbedPane添加关闭按钮

[chongwang610]

考虑了很久要不要写出来现眼。。因为对于这里的这些牛人来说，肯定这算不上什么难题。不过昨天晚上这东西真的困扰我很久。。。所以当作是自己的小结，也希望能对其他一些初学者起到帮助作用。



实现方法一：

baidu过后，看见大多数人都是这么实现的。利用JTabbedPane的这个方法：addTab(String title, Icon icon, Component component)

这个方法可以为Tab添加一个icon图标。于是大家就开始把图标绘制成X，然后响应鼠标点击是否在icon范围内，如果在，就remove掉这个tab。

昨天晚上看的几乎所有实现代码，都是这么做的。只是小有区别，另外由于要绘制icon，所以代码乱七八糟的。。（都是画嘛~）看的我头疼

另外，查过OPENSWING，也是这么实现的。

缺点是画起来太麻烦，代码多，而且icon总是出现在title的前面。如下（openswing实现的效果图）





后来我就想这玩意有那么费劲么。。当时疏忽了去查API。。。又在大量搜索几近崩溃的情况下，找到了sun的一个例子。原来JDK6早就有了类似的新特征，我把注意力直接放在能否加关闭按钮上，禁锢了思路。JDK6新特征允许向Tab里增加组件（但貌似只能加一个组件，加后title就显示不了了。。）。所用方法：setTabComponentAt(int index, Component component)

title显示不了怎么办？其实可以往Tab里面加panel嘛~panel里面放个JLabel和JButton。这就是总的实现思路。sun的实现效果如下：



sun的那个例子代码也够长，还要重绘按钮状态之类。其实有个偷懒的解决办法，就是截按钮图，平常状态、presse状态、rollover状态各一张，这样省的自己画了，写个自定义按钮好了。这样省去了很多代码行，省事了。。我实现的效果图如下（绿窗口是保护眼睛用的。。别慌。。）：





具体代码如下，自定义按钮用内部类实现。虽然不是什么高深的东西，写的也不好，但多少对大家有点用处，因为代码比较简单、比较短。或者拿走直接也能用。由于我毕设自身需要，remove最后一个tab后会生成一个以blank作为title的tab，且没有关闭按钮。用的时候，实例一个JTabbedPane后，把下面这个类的实例当component传给setTabComponentAt这个方法就行了。下面这个类的构造方法的参数是title和JTabbedPane的实例本身。

import java.awt.FlowLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;

/**
 *
 * @author wangchong
 */
public class TabPanel extends JPanel{
    private JLabel title;
    private CloseButton closebutton;
    private final JTabbedPane pane;

    public TabPanel(String s,JTabbedPane pane){
        super(new FlowLayout(FlowLayout.LEFT, 0, 0));
        title=new JLabel(s);
        this.pane=pane;
        closebutton=new CloseButton();
        add(title);
        add(closebutton);
        title.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
        setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
        setOpaque(false);
    }

    private class CloseButton extends JButton {
        private ImageIcon icon;
        public CloseButton(){
            icon=new ImageIcon(getClass().getResource("/Image/Button/close.png"));
            setSize(icon.getImage().getWidth(null),icon.getImage().getHeight(null));
            setIcon(icon);
            setBorder(null);
            setBorderPainted(false);
            setFocusPainted(false);
            setPressedIcon(new ImageIcon(getClass().getResource("/Image/Button/close_pressed.png")));
            setRolloverIcon(new ImageIcon(getClass().getResource("/Image/Button/close_rollover.png")));
            addMouseListener(new MouseAdapter(){
                public void mouseClicked(MouseEvent e){
                    pane.remove(pane.indexOfTabComponent(TabPanel.this));
                    if (pane.getTabCount()==0) {
                        pane.addTab("blank", null);
                    }
                }
            });
        }
    }

}

其实要再加个icon，就比较全面了~完毕
写的不好，大家不要笑话~有不足之处请指教~我会虚心接受~

[createWang]

不错

[the_winter_dream]

不要开玩笑好吗？用不了啊！

[chongwang610]

我现在一直在用，没测试过肯定不会发上来的
哪里出了问题，你发上来我看看。
当然，我里面的几个按钮图片是需要你自己提供的

[天问]

我怎么用着有问题，请帮忙看下，非常感谢！

//import java.awt.Color;
import java.awt.GraphicsConfiguration;
import java.awt.HeadlessException;

import java.awt.event.*;
import java.awt.BorderLayout;

import javax.swing.*;
import javax.swing.tree.*;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Hashtable;
import java.util.Map;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class ProTester extends JFrame implements ActionListener, MouseListener
{
	JMenuItem exit;
	JTextArea xmlText;
	JTextArea runLogText;
	JTextArea sysLogText;
	JTabbedPane xmlTab;
	public DefaultTreeModel treeModel;
	public JTree tree;
	
	Hashtable<Integer, String> ht;
	
	final static int xpos = 200;
	final static int ypos = 200;
	final static int width = 800;
	final static int height = 600;

	public ProTester() throws HeadlessException
	{
		// TODO Auto-generated constructor stub
		super("Protocol Tester");
//		this.setSize(ProTester.width, ProTester.height);
		this.setBounds(ProTester.xpos, ProTester.ypos, ProTester.width, ProTester.height);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		initGUI();

		// setVisible(true);
	}

	static final long serialVersionUID = 65;

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		// TODO Auto-generated method stub
		ProTester proTester = new ProTester();

		try
		{
			UIManager.setLookAndFeel(
			// UIManager.getCrossPlatformLookAndFeelClassName()
					UIManager.getSystemLookAndFeelClassName());
			SwingUtilities.updateComponentTreeUI(proTester);
		} catch (Exception e)
		{
			System.out.println("Can't set look and feel: " + e.getMessage());
			e.printStackTrace();
		}
//		proTester.DomParse();
//		File path = new File("E:\\My project\\Eclipesworkspace\\ProTester\\xml\\");
//		proTester.InitTree(path, (MutableTreeNode) proTester.treeModel.getRoot());
//		proTester.tree.expandPath(new TreePath(proTester.treeModel.getRoot()));
		proTester.setVisible(true);
	}

	public void actionPerformed(ActionEvent evt)
	{
		Object source = evt.getSource();
		if (source == exit)
		{
			System.out.println("How to exit this program, en?");
			System.exit(EXIT_ON_CLOSE);
		}
	}

	private void initGUI()
	{
		// create xml edit area
		JTabbedPane tabXMLText = new JTabbedPane();
		this.xmlTab = tabXMLText;
		BorderLayout tabLay = new BorderLayout();
		this.xmlTab.setLayout(tabLay);
		
		// create log record pane
		JTabbedPane tabLog = new JTabbedPane(JTabbedPane.BOTTOM);
		
		// run log
		JTextArea runLogText = new JTextArea("run log record here.");
		runLogText.setLineWrap(false);
		runLogText.setEditable(false);
		this.runLogText = runLogText;

		JScrollPane runScrollPane = new JScrollPane(runLogText);
		tabLog.addTab("run log", runScrollPane);
		
		// system log
		JTextArea sysLogText = new JTextArea("system log record here.");
		sysLogText.setLineWrap(false);
		sysLogText.setEditable(false);
		this.sysLogText = sysLogText;

		JScrollPane sysScrollPane = new JScrollPane(sysLogText);
		tabLog.addTab("system log", sysScrollPane);

		/* Create the tree. */
		JTree tree = new JTree();
		tree.putClientProperty("JTree.lineStyle", "Angled");
		this.tree = tree;
		tree.addMouseListener(this);

		JScrollPane treePanel = new JScrollPane(tree);
//		BorderLayout bt = new BorderLayout();
//		treePanel.setLayout(bt);
//		treePanel.add(tree);

		JSplitPane splitPane = new JSplitPane();
		splitPane.setOneTouchExpandable (true);
		splitPane.setDividerLocation(ProTester.width*1/6);
		splitPane.setLeftComponent(treePanel);
		splitPane.setRightComponent(tabXMLText);
		
		JSplitPane splitPane2 = new JSplitPane();
		splitPane2.setOneTouchExpandable (true);
		splitPane2.setDividerLocation(ProTester.height*3/5);
		splitPane2.setOrientation(JSplitPane.VERTICAL_SPLIT);
		splitPane2.setTopComponent(splitPane);
		splitPane2.setBottomComponent(tabLog);
		
		BorderLayout big = new BorderLayout();
		this.setLayout(big);
		this.add(splitPane2);
	}

	@Override
	public void mouseClicked(MouseEvent e)
	{
		// TODO Auto-generated method stub
		Object source = e.getSource();
		if (source == this.tree)
		{			
			DefaultMutableTreeNode node = 
				(DefaultMutableTreeNode)this.tree.getLastSelectedPathComponent();
			if (node == null)
			    //Nothing is selected.	
			    return;
			this.runLogText.selectAll();
			this.runLogText.replaceSelection("");
			this.runLogText.append(node.toString() + "\r\n");
			TreeNode[] treeNode = node.getPath();
			this.runLogText.append("this node.getPath() return TreeNode[" + treeNode.length + "].\r\n");
			for (int i=0; i<treeNode.length; i++)
			{
				this.runLogText.append("treeNode[" + i + "] is : " + treeNode[i].toString() + "\r\n");
			}
//			try {
//				InputStream is = new FileInputStream("E:\\My project\\Eclipesworkspace\\ProTester\\xml\\" + node.toString());
//				int buffsize = 512;
//				byte[] buff = new byte[buffsize];
//				while (is.read(buff) != -1) 
//				{
//					this.runLogText.append(new String(buff));
//				}
//				is.close();				
//			} catch (FileNotFoundException ex)
//			{
//				ex.printStackTrace();
//			} catch (IOException ex)
//			{
//				ex.printStackTrace();
//			}
			if ((e.getButton() == MouseEvent.BUTTON1) && (e.getClickCount() >= 2)) 
			{
				this.runLogText.append("you chick double the left mouse key." + "\r\n");
				if (node.isLeaf()) 
				{
					if (this.xmlTab.indexOfTab(node.toString()) == -1)
					{						
						JTextArea xml = new JTextArea("<html>" + node.toString() + "<br><center>" + node.toString() + "</center><br></html>");
						JScrollPane text = new JScrollPane(xml);
						xml.setWrapStyleWord(false);
						xml.setEditable(true);
						TabPanel t = new TabPanel(node.toString(), this.xmlTab);
//						t.add(text);
//						this.xmlTab.addTab(node.toString(), text);
						this.xmlTab.add(t);
					}
//					this.xmlTab.setSelectedIndex(this.xmlTab.indexOfTab(node.toString()));
				}
			}
		}
	}

	@Override
	public void mouseEntered(MouseEvent e)
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void mouseExited(MouseEvent e)
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void mousePressed(MouseEvent e)
	{
		// TODO Auto-generated method stub

	}

	@Override
	public void mouseReleased(MouseEvent e)
	{
		// TODO Auto-generated method stub
		if (e.isPopupTrigger())
		{
			JPopupMenu popMenu = new JPopupMenu("right");
			JMenuItem menuOpen = new JMenuItem("run the test case");			
			popMenu.add(menuOpen);
			popMenu.show(e.getComponent(), e.getX(), e.getY());// 弹出右键菜单
		}
	}
}

[天问]

我是刚开始学JAVA 。。。

[newchina_yuan]

看一下怎么样？

[herry818]

写的很好
学习了

[iwangchengyi]

测试可用。thanks， 好像比例子哪个短了很多