JComponent accepting Keyboard input

[Toyman]

Hi

I've got a class that extends JComponent.
The class implements KeyListener.
Nothing happens when I pless a key !!!
Any ideas why ?

NOTE: ShapeViewer extends JComponent !!!!!

Here is the code.

import java.awt.event.*;

public class ShapeEditor extends ShapeViewer implements KeyListener{

//Constructor(s)
public ShapeEditor(){
addListeners();
}

//Private Methods
private void addListeners(){
addKeyListener(this);
}

//Public Methods
//Overwrite Methods
//Keyboard Events
public void keyPressed(KeyEvent e){
//Invoked when a key has been pressed.
System.out.println("Key " + e.getKeyCode());
}
public void keyReleased(KeyEvent e){
//Invoked when a key has been released.
System.out.println("Key " + e.getKeyCode());
}
public void keyTyped(KeyEvent e){
//Invoked when a key has been typed.
System.out.println("Key " + e.getKeyCode());
}
}

Toyman
VB / Java Programmer
carel_dutoit@yahoo.co.uk

 

[sedj]

Not sure what your error is (don't know what is in "ShapeViewer"), but try this simple example, it works (as long as the window is in focus) :

import java.awt.event.*;
import java.awt.*;

public class KeyBoard extends Frame implements KeyListener{

	public KeyBoard() {
		addKeyListener(this);
		setSize(400, 400);
		setVisible(true);
	}

	public static void main(String args[]) {
		KeyBoard kb = new KeyBoard();
	}
    public void keyPressed(KeyEvent e){
          //Invoked when a key has been pressed.
          System.out.println("Key " + e.getKeyCode());
    }
    public void keyReleased(KeyEvent e){
        //Invoked when a key has been released.
        System.out.println("Key " + e.getKeyCode());
    }
      public void keyTyped(KeyEvent e){
          //Invoked when a key has been typed.
          System.out.println("Key " + e.getKeyCode());
      }
}

--------------------------------------------------
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http://www.primrose.org.uk

 

[Toyman]

HI sedj

Thanks for the reply. But...
This is not wat I want to do....
ShapeViewer is just a class extended from JComponent....
What I want to do is to have a KeyListener on a Class that is extended from a JComponent....

So that when you add the JComponent class to a Frame that one don't need to add KeyListeners to the Frame but it is should already by "activated" through the JComponent.

Think of a JTextField.... surely the KeyListeners is not on the Form to which you add it... but internal to the JTextField Keyhandler Events.....I want to do the same thing !!!!

Thanks


Toyman
VB / Java Programmer
carel_dutoit@yahoo.co.uk

 

[sedj]

I'm not entirely sure what you're getting at - this is the closest I can imagine you can do ...

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

public class KeyBoardFrame extends JFrame {

	public KeyBoardFrame() {
		setSize(400, 400);
		JTextField jtf = new JTextField();
		jtf.addKeyListener(new KeyBoard());
		getContentPane().add(jtf);
		setVisible(true);
	}

	public static void main(String args[]) {
		KeyBoardFrame kb = new KeyBoardFrame();
	}

}

class KeyBoard extends Component implements KeyListener{

	public KeyBoard() {
		this.addKeyListener(this);
	}

    public void keyPressed(KeyEvent e){
          //Invoked when a key has been pressed.
          System.out.println("Key " + e.getKeyCode());
    }
    public void keyReleased(KeyEvent e){
        //Invoked when a key has been released.
        System.out.println("Key " + e.getKeyCode());
    }

    public void keyTyped(KeyEvent e){
        //Invoked when a key has been released.
        System.out.println("Key " + e.getKeyCode());
    }
}

--------------------------------------------------
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http://www.primrose.org.uk