46 lines
1.8 KiB
Python
46 lines
1.8 KiB
Python
"""HAS_WEB_ENGINE — whether ``QWebEngineView`` is safe to construct here
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(R08-T12/T14, extracted from ``ui/structure_graph_view.py``, lines 25-48 of
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its original 1035-line version — the ONLY place this detection logic lived;
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``ui/folder_tab.py`` used to import it FROM that module via a try/except).
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"""
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from __future__ import annotations
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import sys
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from pathlib import Path
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def _frozen_onefile() -> bool:
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"""True only for a PyInstaller ONEFILE build. Onefile extracts itself to a
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temp dir (sys._MEIPASS under %TEMP%), where the QtWebEngine helper process
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can't run — creating a QWebEngineView hard-crashes the app (reported as
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"click the graph tab → app closes"). A ONEDIR build keeps _MEIPASS as the
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``_internal`` folder right next to the exe, where WebEngine works fine, so
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it keeps the full embedded D3/HTML view."""
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if not getattr(sys, "frozen", False):
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return False
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meipass = getattr(sys, "_MEIPASS", "")
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if not meipass:
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return False
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try:
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return Path(meipass).resolve().parent != Path(sys.executable).resolve().parent
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except OSError: # can't tell → play safe: use the native/fallback view
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return True
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# QtWebEngine is noisy and unreliable on the macOS runtime we support (GPU/
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# helper-process failures leave the stacked view blank). The native Qt graph is
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# already available and avoids that failure path entirely.
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HAS_WEB_ENGINE = False
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try: # WebEngine + WebChannel are optional PySide6 add-ons
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if sys.platform == "darwin":
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raise ImportError("use native graph renderer on macOS")
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from PySide6.QtWebEngineWidgets import QWebEngineView # noqa: F401
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from PySide6.QtWebChannel import QWebChannel # noqa: F401
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HAS_WEB_ENGINE = not _frozen_onefile()
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except Exception: # pragma: no cover
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HAS_WEB_ENGINE = False
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__all__ = ["HAS_WEB_ENGINE"]
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