设立可关闭的tab

package demo.swing;

import java.awt.Component;

import java.awt.Dimension;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.InputEvent;

import java.awt.event.KeyEvent;

 

import javax.swing.JCheckBoxMenuItem;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JTabbedPane;

import javax.swing.KeyStroke;

import javax.swing.SwingUtilities;

 

public class TabComponentsDemo extends JFrame{

 

    private JTabbedPane pane = new JTabbedPane();

    private JMenuItem scrollTabItem ;

    private JMenuItem componentTabItem;

    private final int numTab = 5;

      

    public TabComponentsDemo(String title) {

       //设置frame标题名

       super(title);

       //设置关闭方式

       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       //创建菜单栏

       initMenu();

       //将tabpane添加到frame中

       add(pane);

      

    }

   

    //初始化tabpanel相关配置，并且用于resize的调用

    public  void runTest() {

       //设置有关闭按键的标签

       componentTabItem.setSelected(true);

      

       //设置标签

       for(int i = 0 ; i < numTab ; i++)

       {

           //标签名

           String name = "tab "+i;

           //创建标签

           pane.add(name,createContent(name));

           //初始化标签上的文字和Button

           initTabComponent(i);

       }

      

      

       //设置frame的大小

       setSize(new Dimension(500,500));

       //将frame放到屏幕的正中央

       setLocationRelativeTo(null);

       //显示frame

       setVisible(true);

      

 

    }

   

    //创建标签内容部分

    private Component createContent(String name) {

       //创建一个panel，并设置布局为一个分块

       JPanel panel = new JPanel(new GridLayout(1,1));

       //创建一个label

       JLabel label = new JLabel(name);

       //设置label的文本格式

       label.setHorizontalAlignment(JLabel.CENTER);

       //将label放入panel中

       panel.add(label);

       return panel;

    }

 

    //初始化带有关闭按钮的标签头部

    private void initTabComponent(int i) {

       //用这个函数可以初始化标签的头部

       pane.setTabComponentAt(i, new ButtonTabComponent(pane));

       }

   

    //创建菜单栏

    private void initMenu() {

       //创建一个菜单条

       JMenuBar mb = new JMenuBar();

      

       //创建重叠tab选项

       scrollTabItem = new JCheckBoxMenuItem("重叠tab");

       //设置快捷键

        scrollTabItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));

       //设置监听事件

       scrollTabItem.addActionListener(new ActionListener() {

          

           @Override

           public void actionPerformed(ActionEvent arg0) {

              if(pane.getTabLayoutPolicy() == JTabbedPane.SCROLL_TAB_LAYOUT)

                  pane.setTabLayoutPolicy(JTabbedPane.WRAP_TAB_LAYOUT);

              else

                  pane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);

           }

       });

      

       //设置可关闭的标签的菜单

       componentTabItem = new JCheckBoxMenuItem("设置可关闭的tab");

      componentTabItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));

       componentTabItem.addActionListener(new ActionListener() {

          

           @Override

           public void actionPerformed(ActionEvent e) {

              for(int i = 0 ; i < numTab ; i++)

              {

                  if(componentTabItem.isSelected())

                     initTabComponent(i);

                  else

                     pane.setTabComponentAt(i, null);

              }

           }

       });

      

       //设置重置标签

       JMenuItem reSetItem = new JMenuItem("重置");

       reSetItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_R,InputEvent.CTRL_MASK));

       reSetItem.addActionListener(new ActionListener() {

          

           @Override

           public void actionPerformed(ActionEvent e) {

              runTest();

           }

       });

      

       //创建菜单

       JMenu menu = new JMenu("选项");

       //添加菜单项

       menu.add(componentTabItem);

       menu.add(scrollTabItem);

       menu.add(reSetItem);

      

       //添加菜单

       mb.add(menu);

       //添加菜单条（注意一个frame只能有一个菜单条，所以用set）

       setJMenuBar(mb);

      

    }

 

    public static void main(String[] args) {

       SwingUtilities.invokeLater(new Runnable() {

          

           @Override

           public void run() {

              new TabComponentsDemo("可关闭的tab测试").runTest();

           }

       });

    }

 

 

}