1 files changed, 63 insertions, 0 deletions
diff --git a/txtgameengine/scenes.py b/txtgameengine/scenes.py
new file mode 100644
index 0000000..c08e8db
--- /dev/null
+++ b/txtgameengine/scenes.py
@@ -0,0 +1,63 @@
+import typing
+
+from .app import TxtGameApp
+
+
+class SceneTxtGameApp(TxtGameApp):
+    MAIN_SCENE_T: typing.Type['Scene'] = None
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.scene_stack = []
+
+    def push_scene(self, scene_t: typing.Type['Scene']):
+        if self.scene_stack:
+            self.scene_stack[-1].on_pause()
+        self.scene_stack += [scene_t(self)]
+        self.scene_stack[-1].on_enter()
+    
+    def pop_scene(self):
+        self.scene_stack[-1].on_exit()
+        del self.scene_stack[-1]
+        if not self.scene_stack:
+            self.exit()
+            return
+        self.scene_stack[-2].on_resume()
+
+    def update(self, delta):
+        if not self.scene_stack: # TODO: better lifecycles in TxtGameApp so we dont have to hack this
+            self.push_scene(self.MAIN_SCENE_T)
+        super().update(delta)
+        print("Scene Stack:", ' > '.join(type(x).__name__ for x in self.scene_stack))
+        self.scene_stack[-1].update(delta)
+
+class Scene:
+    def __init__(self, app: 'SceneTxtGameApp'):
+        self.app = app
+
+    def pop_scene(self):
+        """Exits this scene and returns control to the parent scene"""
+        self.app.pop_scene()
+
+    def push_scene(self, scene_t: typing.Type['Scene']):
+        """Pushes a scene type onto the scene stack"""
+        self.app.push_scene(scene_t)
+
+    def on_exit(self):
+        """Called when the scene is removed from the scene tree"""
+
+    def on_enter(self):
+        """Called when the scene is first entered in the scene tree"""
+        pass
+
+    def on_pause(self):
+        """Called when another scene takes update priority over this scene without unloading this scene"""
+        pass
+
+    def on_resume(self):
+        """Called when this scene takes over update priority after previously using it to another scene"""
+        pass
+
+    def update(self, delta: float):
+        """Render the current scene"""
+        pass
+\ No newline at end of file