"""
Main world controller.
"""

from appstate import AppState
import pygame
import events

class Controller(events.EventListener):
    """
    Controller class.
    """

    def __init__(self):
        pass

    def _quit(self):
        """ 
        Gracefully quit the simulator.
        """

        quitEvent = events.QuitEvent()
        AppState.get_state().get_event_manager().post_event(quitEvent)

    def process_input(self):
        """
        Process user input.
        """

        for event in pygame.event.get():
            if event.type == pygame.QUIT: 
                self._quit()
                return
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    self._quit()
                    return

    def notify(self, event):
        if isinstance(event, events.TickEvent):
            self.process_input()
"""
Main world controller.
"""

from appstate import AppState
import pygame
import events

class Controller(events.EventListener):
    """
    Controller class.
    """

    def __init__(self):
        pass

    def quit(self):
        """ 
        Gracefully quit the simulator.
        """

        quitEvent = events.QuitEvent()
        AppState.get_state().get_event_manager().post_event(quitEvent)

    def process_input(self):
        """
        Process user input.
        """

        for event in pygame.event.get():
            if event.type == pygame.QUIT: 
                self.quit()
                return
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_ESCAPE:
                    self.quit()
                    return

    def notify(self, event):
        if isinstance(event, events.TickEvent):
            self.process_input()
Change method naming.