How do you check for keyboard events with kivy?

Question

So, awhile ago, I started teaching myself kivy. I started with the main kivy website and went through its pong making tutorial and upon finishing that I decided to try and give it key input. I just can't seem to find any kind of guide to key input with kivy! Anyone know some kind of tutorial or can provide some easy to understand code? I did look at the Keyboard Listener in the examples folder of kivy, but I'm not quite sure how to use that if I'm supposed to.

Thanks for any assistance.

Answer 1

I guess you are asking how to control the paddles with the keyboard. I assume you have the final ping pong codes running on your computer (If not, you can find them at the end of this section).

1 - In the main.py import the Window class:

from kivy.core.window import Window 

2 - Redefine the beginning of the PongGame class so it looks like the following:

class PongGame(Widget):     ball = ObjectProperty(None)     player1 = ObjectProperty(None)     player2 = ObjectProperty(None)      def __init__(self, **kwargs):         super(PongGame, self).__init__(**kwargs)         self._keyboard = Window.request_keyboard(self._keyboard_closed, self)         self._keyboard.bind(on_key_down=self._on_keyboard_down)      def _keyboard_closed(self):         self._keyboard.unbind(on_key_down=self._on_keyboard_down)         self._keyboard = None      def _on_keyboard_down(self, keyboard, keycode, text, modifiers):         if keycode[1] == 'w':             self.player1.center_y += 10         elif keycode[1] == 's':             self.player1.center_y -= 10         elif keycode[1] == 'up':             self.player2.center_y += 10         elif keycode[1] == 'down':             self.player2.center_y -= 10         return True 

Voilà! Press w and s for the left paddle and up and down for the right paddle.