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app_runtime: dark Fusion fallback when no system theme is detected

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Systems without Trolltech.conf (bare Arch, fresh installs without a
DE) were landing on Qt's default light palette. Apply a neutral dark
Fusion palette when no system theme file exists and the palette is
still light. KDE/GNOME users keep their own palette untouched.
This commit is contained in:
pax 2026-04-12 14:43:59 -05:00
parent 11cc26479b
commit 56c5eac870
1 changed files with 25 additions and 4 deletions
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29
booru_viewer/gui/app_runtime.py
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@ -309,11 +309,32 @@ def run() -> None:
# No custom.qss — force Fusion widgets so distro pyside6 builds linked
# against system Qt don't pick up Breeze (or whatever the platform
# theme plugin supplies) and diverge from the bundled-Qt look that
# source-from-pip users get. The inherited palette is intentionally
# left alone: KDE writes ~/.config/Trolltech.conf which every Qt app
# reads, so KDE users still get their color scheme — just under
# Fusion widgets instead of Breeze.
# source-from-pip users get.
app.setStyle("Fusion")
# If no system theme is detected, apply a dark Fusion palette so
# fresh installs don't land on blinding white. KDE/GNOME users
# keep their palette (dark or light) — we only intervene when
# Qt is running on its built-in defaults with no Trolltech.conf.
from PySide6.QtGui import QPalette, QColor
pal = app.palette()
_has_system_theme = Path("~/.config/Trolltech.conf").expanduser().exists()
if not _has_system_theme and pal.color(QPalette.ColorRole.Window).lightness() > 128:
dark = QPalette()
dark.setColor(QPalette.ColorRole.Window, QColor("#2b2b2b"))
dark.setColor(QPalette.ColorRole.WindowText, QColor("#d4d4d4"))
dark.setColor(QPalette.ColorRole.Base, QColor("#232323"))
dark.setColor(QPalette.ColorRole.AlternateBase, QColor("#2b2b2b"))
dark.setColor(QPalette.ColorRole.Text, QColor("#d4d4d4"))
dark.setColor(QPalette.ColorRole.Button, QColor("#353535"))
dark.setColor(QPalette.ColorRole.ButtonText, QColor("#d4d4d4"))
dark.setColor(QPalette.ColorRole.BrightText, QColor("#ff4444"))
dark.setColor(QPalette.ColorRole.Highlight, QColor("#3daee9"))
dark.setColor(QPalette.ColorRole.HighlightedText, QColor("#1e1e1e"))
dark.setColor(QPalette.ColorRole.ToolTipBase, QColor("#353535"))
dark.setColor(QPalette.ColorRole.ToolTipText, QColor("#d4d4d4"))
dark.setColor(QPalette.ColorRole.PlaceholderText, QColor("#7a7a7a"))
dark.setColor(QPalette.ColorRole.Link, QColor("#3daee9"))
app.setPalette(dark)
# Install the popout overlay defaults so the floating toolbar/controls
# have a sane background instead of bare letterbox color.
app.setStyleSheet(_BASE_POPOUT_OVERLAY_QSS)