add keyy listener to jpanel
hello, i have a class that extends jpanel and try to set a key listener on this panel but nothing happens when i press the key here is the code if someone can help :
publicclass BackgroundPanelextends JPanelimplements KeyListener
{
/** Creates a new instance of BackgroundPanel */
public BackgroundPanel()
{
addKeyListener(this);
}
publicvoid keyTyped(KeyEvent e)
{
}
publicvoid keyPressed(KeyEvent e)
{
int c = e.getKeyCode();
switch(c)
{
case KeyEvent.VK_LEFT :
System.out.println("left key pressed");
break;
case KeyEvent.VK_RIGHT :
System.out.println("right kkey pressed");
break;
}
}
publicvoid keyReleased(KeyEvent e)
{
int c = e.getKeyCode();
switch(c)
{
case KeyEvent.VK_LEFT :
System.out.println("left key released");
break;
case KeyEvent.VK_RIGHT :
System.out.println("right key release");
break;
}
}
# 4
thanks for this useful link, unfortunately its still not working, i probably did something wrong, here is the code in my jpanel's constructor :
Action actionRightArrowPressed = new AbstractAction()
{
public void actionPerformed(ActionEvent e)
{
((Flip)lesObstacles.get(6)).bouge();
System.out.println("right kkey pressed");
repaint();
}
};
Action actionLeftArrowPressed = new AbstractAction()
{
public void actionPerformed(ActionEvent e)
{
((Flip)lesObstacles.get(5)).bouge();
System.out.println("left key pressed");
repaint();
}
};
Action actionRightArrowRelease = new AbstractAction()
{
public void actionPerformed(ActionEvent e)
{
((Flip)lesObstacles.get(6)).release();
System.out.println("right key release");
repaint();
}
};
Action actionLeftArrowRelease = new AbstractAction()
{
public void actionPerformed(ActionEvent e)
{
((Flip)lesObstacles.get(5)).release();
System.out.println("left key released");
repaint();
}
};
ActionMap actionMap = this.getActionMap();
actionMap.put("right arrow pressed", actionRightArrowPressed);
actionMap.put("left arrow pressed", actionLeftArrowPressed);
actionMap.put("right arrow released", actionRightArrowRelease);
actionMap.put("left arrow released", actionLeftArrowRelease);
this.setActionMap(actionMap);
KeyStroke rightArrowPressed = KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0, false);
InputMap inputMap = this.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
inputMap.put(rightArrowPressed, "right arrow pressed");
KeyStroke leftArrowPressed = KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0, false);
inputMap.put(leftArrowPressed, "left arrow pressed");
KeyStroke rightArrowReleased = KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0, true);
inputMap.put(rightArrowReleased, "right arrow released");
KeyStroke leftArrowReleased = KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0, true);
inputMap.put(leftArrowPressed, "left arrow released");
