X-Git-Url: https://git.ctpug.org.za/?a=blobdiff_plain;f=koperkapel%2Fscenes%2Fbase.py;h=623eb42a977276e506449831be35956d83758d32;hb=359505e8ab4874f750103bcdc6222207bf52722a;hp=2a094f62b1b2dbbea04f77fc149a5412c24bfe81;hpb=9ef65a0121f312e32cc92ac23a2ec586aa94ad05;p=koperkapel.git

diff --git a/koperkapel/scenes/base.py b/koperkapel/scenes/base.py
index 2a094f6..623eb42 100644
--- 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:
@@ -170,12 +171,21 @@ 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 +202,9 @@ 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()