mirror of
https://github.com/kuhyx/utils.git
synced 2026-11-10 22:47:14 +01:00
Krzysztof kuhy Rudnicki
5f7553de91
Extracted from wake_alarm, screen-locker, and diet_guard, which each independently implemented fullscreen-lock, input-grab, VT-disable, and HMAC-signed-state mechanics at different levels of maturity (the HMAC module was already a hand-copied duplicate between two of them). LockConfig exposes overrideredirect/grab/disable_vt as independent axes so one LockWindow can reproduce all three projects' exact prior behavior, plus screen-locker's confirmed upgrade to retry-forever grab.
37 lines
1.2 KiB
Python
37 lines
1.2 KiB
Python
"""Safe Tk root window that never lets a callback exception escape."""
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from __future__ import annotations
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import logging
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import tkinter as tk
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from collections.abc import Callable
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from types import TracebackType
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_logger = logging.getLogger(__name__)
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class GateRoot(tk.Tk):
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"""Tk root that routes callback errors to a handler instead of crashing.
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Overriding ``report_callback_exception`` is the idiomatic, blind-except-free
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way to guarantee that no exception raised inside a Tk callback escapes the
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event loop -- essential while a global input grab is held, since a crashed
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mainloop would leave the screen grabbed with no way to release it.
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"""
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on_callback_error: Callable[[], None] | None = None
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def report_callback_exception(
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self,
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exc: type[BaseException],
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val: BaseException,
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tb: TracebackType | None,
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) -> None:
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"""Log a callback error and notify the handler; never re-raise."""
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_logger.error("gatelock callback error", exc_info=(exc, val, tb))
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if self.on_callback_error is not None:
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self.on_callback_error()
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