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Add Windows 10 dark mode support via Fusion palette

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Reads AppsUseLightTheme registry key and applies a dark Fusion
palette when the system is set to dark mode. Fixes Qt6 not
picking up dark theme on Windows 10.
This commit is contained in:
pax 2026-04-04 17:21:21 -05:00
parent 4dfd2122a1
commit ea4ff54d9e
1 changed files with 38 additions and 0 deletions
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38
booru_viewer/gui/app.py
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@ -1306,11 +1306,49 @@ class BooruApp(QMainWindow):
super().closeEvent(event)
def _apply_windows_dark_mode(app: QApplication) -> None:
"""Detect Windows dark mode and apply Fusion dark palette if needed."""
try:
import winreg
key = winreg.OpenKey(
winreg.HKEY_CURRENT_USER,
r"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize",
)
value, _ = winreg.QueryValueEx(key, "AppsUseLightTheme")
winreg.CloseKey(key)
if value == 0:
from PySide6.QtGui import QPalette, QColor
app.setStyle("Fusion")
palette = QPalette()
palette.setColor(QPalette.ColorRole.Window, QColor(30, 30, 30))
palette.setColor(QPalette.ColorRole.WindowText, QColor(255, 255, 255))
palette.setColor(QPalette.ColorRole.Base, QColor(15, 15, 15))
palette.setColor(QPalette.ColorRole.AlternateBase, QColor(35, 35, 35))
palette.setColor(QPalette.ColorRole.ToolTipBase, QColor(255, 255, 255))
palette.setColor(QPalette.ColorRole.ToolTipText, QColor(255, 255, 255))
palette.setColor(QPalette.ColorRole.Text, QColor(255, 255, 255))
palette.setColor(QPalette.ColorRole.Button, QColor(40, 40, 40))
palette.setColor(QPalette.ColorRole.ButtonText, QColor(255, 255, 255))
palette.setColor(QPalette.ColorRole.BrightText, QColor(255, 0, 0))
palette.setColor(QPalette.ColorRole.Link, QColor(42, 130, 218))
palette.setColor(QPalette.ColorRole.Highlight, QColor(42, 130, 218))
palette.setColor(QPalette.ColorRole.HighlightedText, QColor(0, 0, 0))
palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Text, QColor(127, 127, 127))
palette.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ButtonText, QColor(127, 127, 127))
app.setPalette(palette)
except Exception:
pass
def run() -> None:
from ..core.config import data_dir
app = QApplication(sys.argv)
# Apply dark mode on Windows 10+ if system is set to dark
if sys.platform == "win32":
_apply_windows_dark_mode(app)
# Load user custom stylesheet if it exists
custom_css = data_dir() / "custom.qss"
if custom_css.exists():