Java - keyboard state after leaving window

Question

The title might be a little misleading, didnt know how to put my problem short.

Basically what im doing is im using keyboardlistener to find out which keys are down and according to that im moving my game character.

The problem is, when you click out of the window, while holding down a key my listener doesnt register the keyReleased event.

I tried to fix it by using mouse listener and the mouseExited event, but that doesnt fix it all the time, sometimes it does sometimes it doesnt.

Heres my implementation:

Keyboard:

public void mouseLeftWindow()
{
    for(int i =0;i<KEY_COUNT;i++)
    {
        keys[i] = false;
    }
}

@Override
public void keyPressed(KeyEvent e) 
{
    int keyCode = e.getKeyCode();
    if(keyCode>=0 && keyCode<KEY_COUNT)
    {
        keys[keyCode] = true;
    }
}

@Override
public void keyReleased(KeyEvent e) 
{
    int keyCode = e.getKeyCode();
    if(keyCode>=0 && keyCode<KEY_COUNT)
    {
        keys[keyCode] = false;
    }
}

where keys[] is a boolean[] describing, which codes are pressed

mouse:

@Override
public void mouseExited(MouseEvent e) 
{
    mouseMoved(e);
    keyboard.mouseLeftWindow();
}

Moh-Aw · Accepted Answer · 2014-05-27 11:06:01Z

2

Your program will listen for further key events even when your mouse exited the component. That means you set everything to false on exit but if a key is still pressed it will be set to true immediately again. I think you are looking for a FocusListener instead of a MouseListener.

    addFocusListener(new FocusListener() {

        @Override
        public void focusGained(FocusEvent e) {

        }

        @Override
        public void focusLost(FocusEvent e) {
            keyboard.mouseLeftWindow();
        }

    });

edited May 27, 2014 at 11:06

answered May 27, 2014 at 10:58

Moh-Aw

3,0382 gold badges32 silver badges45 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Java - keyboard state after leaving window

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related