82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
from abc import ABC
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from functools import lru_cache
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from typing import TYPE_CHECKING, Callable, Type, Any
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if TYPE_CHECKING:
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from source.gui.window import Window
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from source.gui.widget.abc import Widget
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class Scene(ABC):
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"""
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A scene that can be attached to a window.
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It allows to switch the whole comportment of the window in a simpler way.
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It can react to any "on_" event from the window.
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"""
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def __init__(self, window: "Window", *args, **kwargs):
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self.window = window
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self._widgets: set["Widget"] = set()
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# Widget Managing
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def add_widget(self, widget_class: Type["Widget"], **widget_kwargs):
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"""
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Add a widget to the scene.
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:widget_class: the class of the widget to add.
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:widget_args: args for the creation of the widget object.
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:widget_kwargs: kwargs for the creation of the widget object.
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:return: the new created widget.
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"""
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widget: "Widget" = widget_class(self, **widget_kwargs)
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self._widgets.add(widget)
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return widget
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def remove_widget(self, widget: "Widget") -> None:
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"""
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Remove a widget from the scene.
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:scene: the widget to remove.
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"""
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self._widgets.remove(widget)
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def clear_widget(self) -> None:
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"""
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Clear the scene from all the widgets.
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"""
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self._widgets.clear()
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# Event Handling
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@lru_cache
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def _event_wrapper(self, item: str) -> Callable:
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"""
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Un wrapper permettant d'appeler l'événement de tous les widgets attachées.
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:param item: nom de la fonction à appeler dans le widget.
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:return: une fonction appelant l'événement original ainsi que ceux des scènes.
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"""
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# Récupère la fonction originale. S'il n'y en a pas, renvoie une fonction sans effet.*
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func = None
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try: func = super().__getattribute__(item)
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except AttributeError: pass
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def _func(*args, **kwargs) -> None:
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if func is not None: func(*args, **kwargs)
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for widget in self._widgets:
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getattr(widget, item, lambda *_, **__: "pass")(*args, **kwargs)
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return _func
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def __getattribute__(self, item: str) -> Any:
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"""
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Fonction appelée dès que l'on essaye d'accéder à l'un des attributs de l'objet.
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:param item: nom de l'attribut recherché
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:return: l'attribut de l'objet correspondant.
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"""
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# si l'attribut est un événement (commence par "on_"), alors renvoie le dans un wrapper
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return self._event_wrapper(item) if item.startswith("on_") else super().__getattribute__(item)
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