utils/gatelock/gatelock/_surfaces_focus.py
Krzysztof kuhy Rudnicki 6154dc09bf Pin pre-commit's ruff to 0.16.7 and satisfy the CPY001 it brings
The three Python packages pinned ruff twice at different versions:
requirements.txt at 0.16.7, .pre-commit-config.yaml at v0.15.2. Only the
older one ever ran, so `select = ["ALL"]` was enforced two minor versions
behind. Measured before aligning: v0.15.2 reports 0 findings, every 0.16.x
reports CPY001 on each file -- 70 crdt-sync, 23 freedays, 71 gatelock, and
no other rule.

Resolved by adding the notice rather than ignoring the rule, so the gate
keeps its teeth.

Two gatelock modules sat at exactly the 250-line cap, so a one-line header
tipped them to 251. Both are split along a real seam rather than shaved:

  _widget_fills.py    colour arithmetic over LockConfig, no tkinter import
  _surfaces_focus.py  selects among existing surfaces, never mutates them

The focus split keeps _surfaces.py's documented containment (it stays the
only module that creates, moves or destroys windows), and the static guard
in test_recovery_invariants.py globs _surfaces*.py, so the new sibling is
covered with no list to extend. widgets.py re-exports the fills helpers,
which keeps gatelock.widgets the single public surface its tests import.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019kMvSMtsVMB3d2uoZ56pbp
2026-09-12 18:11:24 +02:00

41 lines
1.4 KiB
Python

# Copyright (c) 2026 Krzysztof Rudnicki
"""Which surface takes keyboard focus, and moving it there.
Split from ``_surfaces.py`` (250-line cap). Focus is a read-then-point
concern: it selects among surfaces that already exist and never creates,
moves or destroys one, so it sits outside the structural-change containment
that ``_surfaces`` module docstring describes -- and the static invariant in
``test_recovery_invariants.py`` globs ``_surfaces*.py``, so this sibling is
covered by that guard the moment it exists, with no list to extend.
"""
from __future__ import annotations
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from collections.abc import Mapping
from gatelock._placement import _Surface
from gatelock._surface_types import SurfaceInfo
def focus_surface(surfaces: Mapping[str, _Surface], index: int) -> SurfaceInfo | None:
"""Move keyboard focus to the surface at ``index``, returning what got it."""
for surface in surfaces.values():
if surface.info.index == index:
surface.window.focus_force()
return surface.info
return None
def preferred_focus_index(surfaces: Mapping[str, _Surface]) -> int:
"""Index of the surface that should take initial focus.
The live primary output if there is one, else the first surface.
"""
for surface in surfaces.values():
if surface.info.is_primary:
return surface.info.index
return 0