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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
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