The endless pointlessness of level progression

[koperkapel.git] / koperkapel / scenes / base.py

diff --git a/koperkapel/scenes/base.py b/koperkapel/scenes/base.py
index 2a094f62b1b2dbbea04f77fc149a5412c24bfe81..24a8c615fa06c43f97fe893f302d5aab3197f26b 100644 (file)
--- a/koperkapel/scenes/base.py
+++ b/koperkapel/scenes/base.py
@@ -20,6 +20,7 @@ class Engine:
         self._app = app
         self._scene = scene
         self._world = world
+        self._update_vehicle = False
 
     def _apply_events(self, events):
         if not events:
@@ -28,8 +29,10 @@ class Engine:
             ev.apply(self)
 
     def change_scene(self, scene):
+        print('here', self._scene)
         self._apply_events(self._scene.exit(self._world.proxy()))
         self._scene = scene
+        print('there', self._scene)
         self._apply_events(self._scene.enter(self._world.proxy()))
 
     def change_world(self, *args, **kw):
@@ -170,12 +173,21 @@ class Actors:
                 screen.blit(actor._surf, actor.topleft)
 
 
+def defer_to_update(f):
+    """ Defers a function until the next update run. """
+    @functools.wraps(f)
+    def wrapper(self, *args, **kw):
+        self._deferred_updates.append((f, args, kw))
+    return wrapper
+
+
 class Scene:
     """ Base class for scenes. """
 
     def __init__(self):
         self.actors = Actors()
         self.viewport = (0, 0)
+        self._deferred_updates = []
 
     def move_screen(self, offset):
         self.viewport = (self.viewport[0] + offset[0],
@@ -192,7 +204,9 @@ class Scene:
         pass
 
     def update(self, world, engine, dt):
-        pass
+        deferred_updates, self._deferred_updates = self._deferred_updates, []
+        for f, args, kw in deferred_updates:
+            f(self, world, *args, **kw)
 
     def draw(self, screen):
         screen.clear()