--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gamelib/engine.py	Mon May 07 21:55:55 2012 +0200
@@ -0,0 +1,89 @@
+# -*- coding: utf-8 -*-
+# vim:fileencoding=utf-8 ai ts=4 sts=4 et sw=4
+
+
+"""Game engine stuff"""
+
+import pygame
+from pygame.locals import (MOUSEBUTTONDOWN, MOUSEBUTTONUP, MOUSEMOTION, QUIT,
+        USEREVENT)
+from pygame.time import Clock
+
+from gamelib.constants import FPS
+
+
+class UserEvent(object):
+    # Handy event wrapper
+
+    TYPE = "unknown"
+
+    @classmethod
+    def post(cls, **kw):
+        event = pygame.event.Event(USEREVENT, utype=cls.TYPE, **kw)
+        pygame.event.post(event)
+
+    @classmethod
+    def matches(cls, event):
+        return event.type == USEREVENT and event.utype == cls.TYPE
+
+
+class AddWindow(UserEvent):
+    # Add the given window to the top of the window stack
+
+    TYPE = "ADD_WINDOW"
+
+    @classmethod
+    def post(cls, window):
+        super(AddWindow, cls).post(window=window)
+
+
+class PopWindow(UserEvent):
+    # Pop a window off the top of the window stack
+
+    TYPE = "POP_WINDOW"
+
+    @classmethod
+    def post(cls):
+        super(PopWindow, cls).post()
+
+
+class Engine(object):
+
+    def __init__(self, screen):
+        self._window_stack = []
+        self._running = False
+        self._mouse_down = False
+        self._screen = screen
+
+    def run(self, window):
+        clock = Clock()
+        self._window_stack.append(window)
+        self._running = True
+        self._mouse_down = False
+        while self._running:
+            self.process_input()
+            self.draw()
+            clock.tick(FPS)
+
+    def draw(self):
+        for view in self._window_stack:
+            view.draw(self._screen)
+        pygame.display.flip()
+
+    def process_input(self):
+        for event in pygame.event.get():
+            if self._mouse_down:
+                if event.type == MOUSEBUTTONUP:
+                    self._mouse_down = False
+                    self._window_stack[-1].on_mouse_up(event.pos)
+                elif event.type == MOUSEMOTION:
+                    self._window_stack[-1].on_mouse_move(event.pos)
+            elif not self._mouse_down and event.type == MOUSEBUTTONDOWN:
+                self._mouse_down = True
+                self._window_stack[-1].on_mouse_down(event.pos)
+            elif event.type == QUIT:
+                self._running = False
+            elif AddWindow.matches(event):
+                self._window_stack.append(event.window)
+            elif PopWindow.matches(event):
+                self._window_stack.pop()