Regarding Action and KeyEvents

[adeeb alexander]

Hi,
Can any body please tell how to add both ActionListener and KeyListener for a same button. I have already added ActionListeners. Please can anybody show me a simple example which implement this both events.
Thanks and Reagards

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class ActionAndKey implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        System.out.println("ActionEvent");
    }
 
    private JPanel getContent() {
        JButton button = new JButton("button");
        button.addActionListener(this);
        button.addKeyListener(kl);
        JPanel panel = new JPanel(new GridBagLayout());
        panel.add(button, new GridBagConstraints());
        return panel;
    }
 
    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new ActionAndKey().getContent());
        f.setSize(100,75);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
 
    private KeyListener kl = new KeyAdapter() {
        public void keyPressed(KeyEvent e) {
            System.out.println("keyText = " +
                                e.getKeyText(e.getKeyCode()));
        }
    };
}

[pete stein]

Originally posted by adeeb alexander:
Hi,
Can any body please tell how to add both ActionListener and KeyListener for a same button. I have already added ActionListeners. Please can anybody show me a simple example which implement this both events.
Thanks and Reagards

Why would you even want to add a keylistener to a button? You would have to first get the button in focus, then press the key,... it really doesn't make much sense. Please explain the rationale here.

It suggests to me that you really want to use a mnemonic with your button, and that you haven't yet read the Button tutorial in the Sun Swing Tutorials which describes how to do this. If you read the tutorials and the API before asking questions, you may save yourself and us a lot of time.

[adeeb alexander]

Actually the default key on the panel is space that is when i press the space key the button is pressed i want to change this to enter key. How?

[Craig Wood]

There are two ways you could try:
1 — Make the button the default button for the JRootPane. See the setDefaultButton method in the JRootPane api - the Method Detail entry points to the limitations of this approach. Also, see the second paragraph under the header "How to Use JButton Features" on How to Use Buttons, Check Boxes, and Radio Buttons
2 — You could bind the Enter key to the button. See How to Use Key Bindings for details.