naja/events.py

   1 """
   2 Custom Pygame events.
   3 """
   4
   5 import pygame.event as pge
   6 import pygame.locals as pgl
   7
   8
   9 def finish_event(handled=True, skip_invalidate=False):
  10     if not skip_invalidate:
  11         InvalidateTheWorld.post()
  12     return handled
  13
  14
  15 class NajaEvent(object):
  16     TYPE = "UNKNOWN"
  17
  18     @classmethod
  19     def post(cls, **attributes):
  20         event = pge.Event(pgl.USEREVENT, naja_event_type=cls.TYPE,
  21                           **attributes)
  22         pge.post(event)
  23
  24     @classmethod
  25     def matches(cls, ev):
  26         return ev.type == pgl.USEREVENT and ev.naja_event_type == cls.TYPE
  27
  28
  29 class SceneChangeEvent(NajaEvent):
  30     TYPE = "SCENE_CHANGE"
  31
  32     @classmethod
  33     def post(cls, scene_cls):
  34         super(SceneChangeEvent, cls).post(scene_cls=scene_cls)
  35
  36
  37 class QuitGameEvent(NajaEvent):
  38     TYPE = "QUIT_GAME"
  39
  40
  41 class InvalidateTheWorld(NajaEvent):
  42     # This is used to signal to all the widgets that the world has changed
  43     # and cached state may need to be recreated
  44     TYPE = "INVALIDATE"
  45
  46
  47 class SelectEvent(NajaEvent):
  48     TYPE = "SELECT"
  49
  50
  51 class LoadGameEvent(NajaEvent):
  52     TYPE = "LOAD_GAME"
  53
  54     @classmethod
  55     def post(cls, state):
  56         super(LoadGameEvent, cls).post(state=state)