intframeeventdemo.java

来自「《java事件处理指南》一书的代码,好东西」· Java 代码 · 共 91 行

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class IntFrameEventDemo extends JFrame implements ActionListener
{
   private JInternalFrame jif;
   private JTextField jtf;
   private JButton button;

   public IntFrameEventDemo() 
   {
/*  A JInternalFrame object is created and placed on a JFrame.    */
/*  The JInternalFrame registers a InternalFrameListener.         */

      jif = new JInternalFrame("Bailey", true, true, true, true);
      jif.getContentPane().add(new JLabel(new ImageIcon("Bailey.jpg")));
      jif.setSize(200, 100);
      jif.setDefaultCloseOperation(WindowConstants.HIDE_ON_CLOSE);
      jif.addInternalFrameListener(new InternalFrameHandler());

      button = new JButton("show");
      button.setBorder(BorderFactory.createRaisedBevelBorder());
      button.addActionListener(this);

      jtf = new JTextField(20);
      jtf.setEditable(false);

      JPanel centerPanel = new JPanel();
      centerPanel.add(jif);

      JPanel southPanel = new JPanel();
      southPanel.add(jtf);
      southPanel.add(button);

      getContentPane().add(centerPanel, BorderLayout.CENTER);
      getContentPane().add(southPanel, BorderLayout.SOUTH);

      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setBounds(100, 100, 300, 300);
      setVisible(true);
   }

/*  The InternalFrameListener is implemented as an inner class.   */
/*  If the JInternalFrame is iconified or de-inconified, an       */
/*  InternalFrameEvent is generated and sent to the appropriate   */
/*  method where the iconified state of the JInternalFrame is     */
/*  displayed in a JTextField.  The other five methods declared   */
/*  in the InternalFrameListener interface aren't used in this    */
/*  application but must be given some implementation.  They are  */
/*  implemented as stub methods.                                  */ 

   class InternalFrameHandler implements InternalFrameListener
   {
      public void internalFrameDeiconified(InternalFrameEvent event)
      {
         jtf.setText("internal frame deiconified");
         invalidate();
         validate();
      }

      public void internalFrameIconified(InternalFrameEvent event)
      {
         jtf.setText("internal frame iconified");
         invalidate();
         validate();
      }

      public void internalFrameActivated(InternalFrameEvent event) {}
      public void internalFrameClosed(InternalFrameEvent event) {}
      public void internalFrameClosing(InternalFrameEvent event) {}
      public void internalFrameDeactivated(InternalFrameEvent event){}
      public void internalFrameOpened(InternalFrameEvent event) {}
   }

/*  When the "show" button is pressed, the JInternalFrame is made  */
/*  visible.                                                       */

   public void actionPerformed(ActionEvent event)
   {
      jif.show();
   }

   public static void main(String args[]) 
   {
      IntFrameEventDemo demo = new IntFrameEventDemo();
   }
}