29 lines
1.0 KiB
Python
29 lines
1.0 KiB
Python
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from __future__ import annotations
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from contextvars import ContextVar
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from typing import TYPE_CHECKING, Any, Callable
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if TYPE_CHECKING:
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from textual.app import App
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from textual.message import Message
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from textual.message_pump import MessagePump
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from textual.screen import Screen
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class NoActiveAppError(RuntimeError):
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"""Runtime error raised if we try to retrieve the active app when there is none."""
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active_app: ContextVar["App[Any]"] = ContextVar("active_app")
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active_message_pump: ContextVar["MessagePump"] = ContextVar("active_message_pump")
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prevent_message_types_stack: ContextVar[list[set[type[Message]]]] = ContextVar(
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"prevent_message_types_stack"
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)
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visible_screen_stack: ContextVar[list[Screen[object]]] = ContextVar(
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"visible_screen_stack"
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)
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"""A stack of visible screens (with background alpha < 1), used in the screen render process."""
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message_hook: ContextVar[Callable[[Message], None]] = ContextVar("message_hook")
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"""A callable that accepts a message. Used by App.run_test."""
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