package events;

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

public class WindowEventDemo extends JFrame
    implements WindowListener,
    WindowFocusListener {
  static final String newline = System.getProperty("line.separator");
  static final  String space = "  ";
  static WindowEventDemo frame = new WindowEventDemo("WindowEventDemo");
  JTextArea display;
  
  public static void main(String[] args) {
    /* Use an appropriate Look and Feel */
    try {
      //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
      //UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
      UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
    } catch (UnsupportedLookAndFeelException ex) {
      ex.printStackTrace();
    } catch (IllegalAccessException ex) {
      ex.printStackTrace();
    } catch (InstantiationException ex) {
      ex.printStackTrace();
    } catch (ClassNotFoundException ex) {
      ex.printStackTrace();
    }
    /* Turn off metal's use of bold fonts */
    UIManager.put("swing.boldMetal", Boolean.FALSE);
    
    //Schedule a job for the event dispatch thread:
    //creating and showing this application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        createAndShowGUI();
      }
    });
  }
  
   /**
   * Create the GUI and show it.  For thread safety,
   * this method should be invoked from the
   * event-dispatching thread.
   */
  
  private static void createAndShowGUI() {
    //Create and set up the window.
    frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    
    //Set up the content pane.
    frame.addComponentsToPane();
    
    //Display the window.
    frame.pack();
    frame.setVisible(true);
  }
  
  private void addComponentsToPane() {
    display = new JTextArea();
    display.setEditable(false);
    JScrollPane scrollPane = new JScrollPane(display);
    scrollPane.setPreferredSize(new Dimension(500, 450));
    getContentPane().add(scrollPane, BorderLayout.CENTER);
    
    addWindowListener(this);
    addWindowFocusListener(this);
  }
  
  public WindowEventDemo(String name) {
    super(name);
  }  
  
  public void windowClosing(WindowEvent e) {
    displayMessage("WindowListener method called: windowClosing.");
    //A pause so user can see the message before
    //the window actually closes.
    ActionListener task = new ActionListener() {
      boolean alreadyDisposed = false;
      public void actionPerformed(ActionEvent e) {
        if (frame.isDisplayable()) {
          alreadyDisposed = true;
          frame.dispose();
        }
      }
    };
    Timer timer = new Timer(500, task); //fire every half second
    timer.setInitialDelay(2000);    //first delay 2 seconds
    timer.setRepeats(false);
    timer.start();
  }
  
  public void windowClosed(WindowEvent e) {
    //This will only be seen on standard output.
    displayMessage("WindowListener method called: windowClosed.");
  }
  
  public void windowOpened(WindowEvent e) {
    displayMessage("WindowListener method called: windowOpened.");
  }
  
  public void windowIconified(WindowEvent e) {
    displayMessage("WindowListener method called: windowIconified.");
  }
  
  public void windowDeiconified(WindowEvent e) {
    displayMessage("WindowListener method called: windowDeiconified.");
  }
  
  public void windowActivated(WindowEvent e) {
    displayMessage("WindowListener method called: windowActivated.");
  }
  
  public void windowDeactivated(WindowEvent e) {
    displayMessage("WindowListener method called: windowDeactivated.");
  }
  
  public void windowGainedFocus(WindowEvent e) {
    displayMessage("WindowFocusListener method called: windowGainedFocus.");
  }
  
  public void windowLostFocus(WindowEvent e) {
    displayMessage("WindowFocusListener method called: windowLostFocus.");
  }
  
  private void displayMessage(String msg) {
    display.append(msg + newline);
    System.out.println(msg);
  }
}