多文档界面示例

程序运行结果截图：

程序清单如下：

import javax.swing.*;

import javax.swing.event.*;

import java.awt.*;

import java.awt.event.*;

public class Example10_36

{

public static void main(String args [])

{

MDIWindow win = new MDIWindow();

}

}

class MyInternalFrame extends JInternalFrame

{

JTextArea text;

MyInternalFrame(String title)

{

super(title,true,true,true,true);

text = new JTextArea();

add(new JScrollPane(text),BorderLayout.CENTER);

setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

addInternalFrameListener(new InternalFrameAdapter()

{

public void internalFrameActivated(InternalFrameEvent e)

{

setLayer(JDesktopPane.DRAG_LAYER);

}

public void internalFrameDeactivated(InternalFrameEvent e)

{

setLayer(JDesktopPane.DEFAULT_LAYER);

}

}

);

}

public JTextArea getJTextArea()

{

return text;

}

}

class MDIWindow extends JFrame implements ActionListener

{

JDesktopPane desk; //用来添加内部窗体的桌面容器

JMenuBar MenuBar;

JMenu Menu;

JMenuItem itemNew,itemCopy,itemCut,itemPaste;

MDIWindow()

{

desk = new JDesktopPane();

desk.setDesktopManager(new DefaultDesktopManager());

add(desk,BorderLayout.CENTER);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

MenuBar = new JMenuBar();

Menu = new JMenu("编辑");

itemNew = new JMenuItem("新建");

itemCopy = new JMenuItem("复制");

itemCut = new JMenuItem("剪切");

itemPaste = new JMenuItem("粘贴");

itemNew.addActionListener(this);

itemCopy.addActionListener(this);

itemCut.addActionListener(this);

itemPaste.addActionListener(this);

Menu.add(itemNew);

Menu.add(itemCopy);

Menu.add(itemCut);

Menu.add(itemPaste);

MenuBar.add(Menu);

setJMenuBar(MenuBar);

setBounds(100,100,300,300);

setVisible(true);

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource() == itemNew)

{

JInternalFrame a[] = desk.getAllFrames();

for(int i = 0;i

{

desk.setLayer(a[i],JDesktopPane.DEFAULT_LAYER);

}

JInternalFrame newInternalFrame = new MyInternalFrame("无标题"); //创建一个内部窗体

newInternalFrame.setBounds(10,10,300,300);

newInternalFrame.setV isible(true);

desk.add(newInternalFrame,JDesktopPane.DRAG_LAYER);

}

if(e.getSource() == itemCopy)

{

MyInternalFrame internalFrame = (MyInternalFrame)desk.getSelectedFrame();

JTextArea text = internalFrame.getJTextArea();

text.copy();

}

else if(e.getSource() == itemCut)

{

MyInternalFrame internalFrame = (MyInternalFrame)desk.getSelectedFrame();

JTextArea text = internalFrame.getJTextArea();

text.cut();

}

else if(e.getSource() == itemPaste)

{

MyInternalFrame internalFrame = (MyInternalFrame)desk.getSelectedFrame();

JTextArea text = internalFrame.getJTextArea();

text.paste();

}

}

}