Johannes Kirschbauer
0fb207bb59
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37 lines
799 B
Python
37 lines
799 B
Python
from typing import Any
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import gi
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gi.require_version("Gtk", "4.0")
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gi.require_version("Adw", "1")
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from gi.repository import Adw
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class ViewStack:
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"""
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This is a singleton.
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It is initialized with the first call of use()
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Usage:
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ViewStack.use().set_visible()
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ViewStack.use() can also be called before the data is needed. e.g. to eliminate/reduce waiting time.
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"""
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_instance: "None | ViewStack" = None
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view: Adw.ViewStack
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# Make sure the VMS class is used as a singleton
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def __init__(self) -> None:
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raise RuntimeError("Call use() instead")
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@classmethod
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def use(cls: Any) -> "ViewStack":
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if cls._instance is None:
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cls._instance = cls.__new__(cls)
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cls.view = Adw.ViewStack()
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return cls._instance
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