ykcheungab
66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
"""Load/save dashboard user preferences for the finger 3D viewer."""
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from __future__ import annotations
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import json
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from pathlib import Path
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from typing import Any
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from gui.app_paths import resource_path
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PREFERENCE_FILE = "preference.json"
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LEGACY_CAMERA_SELECTION_FILE = "camera_selection.json"
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# Keep preference.json at examples/gui/ for backward compatibility.
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_GUI_DIR = Path(__file__).resolve().parents[1]
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def preference_path() -> Path:
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# Keep preference file at examples/gui/preference.json
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return _GUI_DIR / PREFERENCE_FILE
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def legacy_camera_selection_path() -> Path:
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return resource_path(LEGACY_CAMERA_SELECTION_FILE)
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def _read_json(path: Path) -> dict[str, Any]:
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if not path.is_file():
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return {}
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try:
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data = json.loads(path.read_text(encoding="utf-8"))
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except (OSError, json.JSONDecodeError):
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return {}
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return data if isinstance(data, dict) else {}
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def load_preferences() -> dict[str, Any]:
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"""Load preferences, migrating camera_id from legacy file when needed."""
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prefs = _read_json(preference_path())
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if "video_source" not in prefs:
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legacy = _read_json(legacy_camera_selection_path())
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camera_id = legacy.get("camera_id")
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if camera_id is not None and str(camera_id).strip():
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prefs["video_source"] = str(camera_id).strip()
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return prefs
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def save_preferences(prefs: dict[str, Any]) -> None:
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"""Write preferences atomically enough for dashboard use."""
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if not isinstance(prefs, dict):
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return
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path = preference_path()
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try:
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path.parent.mkdir(parents=True, exist_ok=True)
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path.write_text(json.dumps(prefs, indent=2) + "\n", encoding="utf-8")
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except OSError:
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pass
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def get_preferred_video_source(prefs: dict[str, Any] | None = None) -> str | None:
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data = prefs if prefs is not None else load_preferences()
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value = data.get("video_source")
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if value is None:
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return None
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text = str(value).strip()
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return text or None
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