Question on focusing

[elliotHenry]

Hi folks

Ok, yet another issue for me I'm hoping you can help with. My GUI has keyListeners added to the buttons. When I start up the app, and start to type nothing happens until AFTER I've pressed one of the buttons (i.e. the buttons are now in focus). How to I allow for either a key press event or button pressed event to work on startup? Code below:

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.*;
public class MyGui extends MasterGUI
{
   public MyGui()
    {
          
        KeyAdapter adt;
        for (int i = 0; i < KEYS.length; i++)
        {
            mem.put(KEYS[i], "");
        }
        mem.put(currentKey, "");
        int k = 0;
        for (int j = 0; j < 4; j++)
        {
            for (int i = 0; i < 5; i++)
            {
                JButton b = (JButton) buts[k];
                b.addActionListener(new ButtonSeeker(k));
                k++;
            }
        }
        adt = new KeyWatcher();
        setFocusable(true);
        MenuSeeker menWat = new MenuSeeker();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        exit.addActionListener(menWat);
        for (int i=0; i<menu.length; i++)
        {
            if(menu[i] != null)
          {
              menu[i].addActionListener(menWat);
          }
        }
      for (int i = 0; i<buts.length; i++)
      {
         buts[i].addKeyListener(adt);
      }     
        for (int i = 0; i<buts.length; i++)
     {
         buts[i].setVisible(true);
         buts[i].addKeyListener(adt);     
     }
    }
  private class KeyWatcher extends KeyAdapter
    {
        @Override
        public void keyPressed(KeyEvent k)
        {
            Character ch = k.getKeyChar();
            char aCha = ch.toUpperCase(cha);
            System.out.println(aCha);           
        }
    }
    private class MenuSeeker implements ActionListener
    {
        @Override
        public void actionPerformed(ActionEvent e)
        {
           // TODO complete the method
            if (e.getSource() == exit)
            {
                System.exit(0);
            }
            for (int i = 0; i < menu.length; i++)
            {
               if(e.getSource() == menu[i] )
                {
                    System.out.println(e.getSource().toString());
                }
            }           
        }
    }
    private class ButtonSeeker implements ActionListener
    {
        private int command = 0;
        private ButtonSeeker(int k)
        {
            command = k;
        }
        @Override
        public void actionPerformed(ActionEvent e)
        {
            System.out.println(e.getID() + "here");
        }
    }
}

I think I'm doing the setVisable at line 46 wrong. Would appreciate any advice.

Thanks

[JosAH]

A Button class extends a JComponent class (indirectly) so it inherits methods from the JComponent class; a JComponent has a few methods to acquire the keyboard focus.

kind regards,

Jos

[DarrylBurke]

Swing was designed to work with Key Bindings. Drop the KeyListener(s) and learn how to do it the Swing way: How to Use Key Bindings (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Other Swing Features)

Moving this thread to AWT/Swing.

db

[elliotHenry]

A Button class extends a JComponent class (indirectly) so it inherits methods from the JComponent class; a JComponent has a few methods to acquire the keyboard focus.

kind regards,

Jos

Thanks Josh

The API seems to want me to add the requestFocusInWindow() to a particular button but not sure where I should apply this. Can you provide a hint?

[elliotHenry]

Swing was designed to work with Key Bindings. Drop the KeyListener(s) and learn how to do it the Swing way: How to Use Key Bindings (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Other Swing Features)

Moving this thread to AWT/Swing.

db

Hi DarrylBurke

If this wasn't a homework question I'd be all over it. But as it stands I have to follow the criteria set out in the quesiton.

[DarrylBurke]

Don't double post. Your other thread has been moved to AWT/Swing and closed.
Please go through http://www.java-forums.org/content/113-forum-rules.html

db