实现场景切换

src/scenes/base_scene.py

@@ -3,9 +3,13 @@ import pygame
 class BaseScene:
     def __init__(self, screen: pygame.Surface):
         self.screen = screen
+        self.next_scene = None
 
     def update(self):
         pass
 
     def handle_event(self, events):
-        pass
+        pass
+
+    def switch_to_scene(self, scene_class):
+        self.next_scene = scene_class(self.screen)