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 www.geocities.com/kengssoft/slideshow/

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) {
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.