I am new to programming, so forgive me if I make silly mistakes.
I want to make a game, and I started by making the player, and that's where I'm stuck at. I'm trying to use Keybindings (InputMap and ActionMap of a JComponent) to make the player move, but something really odd is happening. When I hold "A" to make the player move to the left, that's what he does. But if I then press "D" to make him move right, he just stands still. Then, if I release and press "D" again, it does move. This happens with all of my keyboards, and I had a similar problem when using a KeyListener.
This seems like a problem with another class, like the Player class, but it isn't: When the situation i described occurs, the AbstractActions I created aren't being called! And that was the same with the KeyPressed() method when I was using a KeyListener.
This is my class for managing keyboard-input:
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JLabel;
import javax.swing.KeyStroke;
public class KeyManager {
private JLabel keyManager;
private Action leftTrue, leftFalse, rightTrue, rightFalse;
public boolean left = false, right = false, up = false, down = false;
public KeyManager() {
initActions();
keyManager = new JLabel();
System.out.println("called");
keyManager.getInputMap(JLabel.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("D"), "pressed_D");
keyManager.getInputMap(JLabel.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("released D"), "released_D");
keyManager.getInputMap(JLabel.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("A"), "pressed_A");
keyManager.getInputMap(JLabel.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke("released A"), "released_A");
keyManager.getActionMap().put("pressed_D", rightTrue);
keyManager.getActionMap().put("pressed_A", leftTrue);
keyManager.getActionMap().put("released_D", rightFalse);
keyManager.getActionMap().put("released_A", leftFalse);
}
public JLabel getKeyManager() {
return keyManager;
}
private void initActions() {
leftTrue = new AbstractAction() {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("pressed a");
left = true;
}
};
leftFalse = new AbstractAction() {
private static final long serialVersionUID = 2L;
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("released a");
left = false;
}
};
rightTrue = new AbstractAction() {
private static final long serialVersionUID = 3L;
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("pressed d");
right = true;
}
};
rightFalse = new AbstractAction() {
private static final long serialVersionUID = 4L;
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("released d");
right = false;
}
};
}
}
The JLabel object is added to my JFrame in another class
I don't feel like my explanation of the problem made much sense, so here's a video of what's happening:
https://www.dropbox.com/s/7bs6r1kt6z489rf/JavaHelp.mov?dl=0
Does someone know how to fix this? :(
