code: func (w *Window) JoystickJustPressed(js Joystick, button int) bool {
  	return w.currJoy.getButton(js, button) && !w.prevJoy.getButton(js, button)
  }
docs: // JoystickJustPressed returns whether the joystick Button has just been pressed down.
  // If the button index is out of range, this will return false.
  //
  // This API is experimental.