adding keylistener

[acunlai]

hi guys, i need to write a program about slide show in java, please help me with these wrong code :

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

class myframe extends JWindow
{

  myframe()
  {
    setLocation(200,200);
    setSize(250,150);
    addKeyListener(new Listen());
    show();


   }


   class Listen extends KeyAdapter
   {
        public void keyPressed(KeyEvent e){
            if (e.getKeyCode() == e.VK_ENTER)
                 {

       System.exit(0);}
                  }
   }

}

public class key_listener
{
  public static void main(String[] args )
  {
   new myframe();
  }
}

thanks in advance

[server_crash]

You have to override all the keylistener methods:

public void keyTyped(KeyEvent key) 
	 {
	      
	 }
	 public void keyPressed(KeyEvent ke) 
	 {
	      
	 }
	 public void keyReleased(KeyEvent key) 
	 {
         }

[acunlai]

I found a slideshow program written in java at [url]www.geocities.com/kengssoft/slideshow/[/url]

but I got that the ' addKeyListener ' didn't run properly , when it executed, it looked likes could not accept the 'Enter' key , I have j2re 1.4.2 on Win Xp
The following lines are the codes :

// SSWindow.java
import javax.swing.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;

/**
 *  The Slide Show window
 */
public class SSWindow extends JWindow implements KeyListener,
   ActionListener, FileFilter 
{

    /** The image label */
    JLabel imageLabel;

    /** The parent */
    JFrame parent;

    /** The directory */
    String direc;

    /** List of files in the directory */
    String[] filenames;

    /** Delay in milliseconds */
    int delay;

    /** Counter */
    int count;

    /** The timer that displays the Slide Show */
    Timer timer;



    /* Constructor */
    public SSWindow(JFrame par, String direc, float seconds)
   {
    super(par);
    parent = par;

    this.direc = direc;
    delay = (int)(seconds*1000);

    // Add label to center of screen
    Container back = getContentPane();
    imageLabel = new JLabel();
    back.setBackground(Color.black);
    back.add(imageLabel);
    imageLabel.setVerticalAlignment(JLabel.CENTER);
    imageLabel.setHorizontalAlignment(JLabel.CENTER);

    // Display the window
    JFrame loading = JFrame();

    addKeyListener(this);
    setSize(getToolkit().getScreenSize());
    setVisible(true);

    // Get the names of the files
    File[] files = (new File(direc)).listFiles(this);
    filenames = new String[files.length];

           //System.out.println("Filenames.length = "+filenames.length);

    for (int i=0; i<filenames.length; i++) {
        filenames[i] = files[i].toString();
    }
    count = -1;
    timer = new Timer(delay, this);
    timer.start();
   } // End constructor

    /** Function that changes the image */
    public void updateImage() 
   {
    try {
        imageLabel.setIcon(new ImageIcon(filenames[count]));
    } catch(Exception ex) {
        timer.stop();
    }
    } // End updateImage()

    /** Handle the key released event from the text field. */
    public void keyPressed(KeyEvent e) 
    {
    int keyCode = e.getKeyCode();

    switch(keyCode) 
            {
       // If ESC is pressed, then quit
       case KeyEvent.VK_ESCAPE:
        timer.stop();

        System.exit(0);
        break;

       // If ENTER is pressed, then go back to Main Menu
       case KeyEvent.VK_ENTER:
        timer.stop();
        parent.setVisible(true);
        SSWindow.this.dispose();
        break;
                }

       } // end keyReleased()

      /* These have to implemented */
     public void keyTyped(KeyEvent e) {}
     public void keyReleased(KeyEvent e) {}

     public void actionPerformed(ActionEvent e) {
    count++;
      /*
      // If we have gone past the last file,...
      // return to beginning.
    if (count > filenames.length) {
        count = 0;
    }
      */
       //   System.out.print(new Integer(count).toString()+" ");
    updateImage();
       } // End actionPerformed()

       public boolean accept(File file)
     {
    String filename = file.toString();
    if (filename.endsWith(".tiff") ||
       filename.endsWith(".tif") ||
       filename.endsWith(".gif") ||
       filename.endsWith(".jpeg") ||
       filename.endsWith(".jpg")) {
        return true;
    } else {
        return false;
    }
     } // End accept()

} // End class SSWindow

And here is the main() class :

// SSFrame.java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

/**
 *  The Slide Show's Opening Screen
 */
public class SSFrame extends JFrame 
{

   JTextField direcText, delayText;
   JFileChooser fc;

    static final String
       WINTITLE="Kengs' Slide Show Viewer",
       DIRECTORY="Directory : ",
       BROWSE="Browse...",
       DELAY="Delay : ",
       TIME="2",
       SECONDS="seconds",
       START="Start SlideShow!",
       ADVANCED="Advanced...",
       ABOUT="About...",
       EXIT="Exit";

    public static void main(String args[]) 
   {
    SSFrame ss = new SSFrame();
    } // End main()

    public SSFrame() 
   {

    // Set the title
        setTitle(WINTITLE);

    Container back = getContentPane();
    back.setLayout(new GridLayout(0,1));

    back.add(new JLabel(new ImageIcon("images/kss.gif")));

    fc = new JFileChooser();
    fc.setFileSelectionMode(fc.DIRECTORIES_ONLY);

    JPanel p1 = new JPanel();
    p1.add(new JLabel(DIRECTORY, new ImageIcon         ("images/directory.gif"), JLabel.CENTER));
        p1.add(direcText = new JTextField(20));
    JButton browseButton = new JButton(BROWSE, new ImageIcon("images/browse.gif"));
    browseButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int returnVal = fc.showOpenDialog(SSFrame.this);
                if (returnVal == JFileChooser.APPROVE_OPTION) {
            direcText.setText(fc.getSelectedFile().toString());
                }
            }
        });
    p1.add(browseButton);

    back.add(p1);

    JPanel p1e = new JPanel();
    p1e.add(new JLabel(DELAY, new ImageIcon("images/delay.gif"), JLabel.CENTER));
    p1e.add(delayText = new JTextField(TIME, 5));
    p1e.add(new JLabel(SECONDS));
    back.add(p1e);

    JPanel p2 = new JPanel();
    JPanel butPanel = new JPanel();
    butPanel.setBorder(BorderFactory.createLineBorder(Color.black));
    JButton startButton = new JButton(START, new ImageIcon("images/start.gif"));
    startButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
        SSFrame.this.hide();
        SSWindow s = new SSWindow(
           SSFrame.this, direcText.getText(),
           new Float(delayText.getText()).floatValue()
        );
        }
    });
    butPanel.add(startButton);
    p2.add(butPanel);
    JButton aboutButton = new JButton(ABOUT, new ImageIcon("images/about.gif"));
    aboutButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
        // Should display message box here
        }
    });
    p2.add(aboutButton);
    JButton exitButton = new JButton(EXIT, new ImageIcon("images/exit.gif"));
    exitButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
        System.exit(0);
        }
    });
    p2.add(exitButton);               
    back.add(p2);

    addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

    pack();
    setVisible(true);
} // End constructor

} // End class MainFrame

Please again help me solve this problem. :-|
Thanks for the help. :p

[freesoft_2000]

Hi everyone,

First what do you want the program to do when you press enter??

Try this

public class A implements KeyListener
{

public void keyTyped(KeyEvent key) 
{
}
public void keyPressed(KeyEvent key) 
{
int code = key.getKeyCode();

if(code == KeyEvent.VK_ENTER)
{
//Do something here
System.out.println("You pressed enter");
}

}

public void keyReleased(KeyEvent key) 
{
}

}

Try running the above program. If it does not work then most probably it is a bug.

Let me know what happens

Here by the way here is an article on the keylistener with sample code

http://javaalmanac.com/egs/java.awt.event/KeyEvents.html

I hope this helps you

Yours Sincerely

Richard West

[acunlai]

Hi everyone,
This listing code doesn't work for me , any suggestion welcome please...

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

class MyKeyListener extends KeyAdapter
{
    public void keyReleased(KeyEvent key)
    {       }
    public void keyTyped(KeyEvent key)
    {       }
    public void keyPressed(KeyEvent key)
    {
        // Check for key characters.
        int code = key.getKeyCode();
        if(code == KeyEvent.VK_ENTER)
       {

               System.exit(0);
        }
     }
}
public class myframe
{
    public static void main(String[] args)
    {
        JWindow wnd = new JWindow();
        wnd.setSize(250,150);
        wnd.show();
        wnd.addKeyListener(new MyKeyListener());
    }
}

[TheWhite]

instead of extending KeyAdapter, try implementing KeyListener

[jasimp]

3 year old thread. Please do not revive these old threads.