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Change to using a fixed standard light palette

Browse Source 
This fixes all manner of subtle issues introduced by Qt's broken
attempts to map system colors to a QPalette.

1) Highlight color being same as Windows' accent color (this is anyway
   reverted in Qt 6.6)

2) Window titlebars not following system light/dark changes on Windows.

3) All the custom code that I wrote for tracking system light/dark
   changes can be dropped in favor of the new QStyleHints::colorScheme
   property

4) We had a fixed dark mode palette but not a fixed light mode palette.

I am sure people, especially on Linux, are going to complain about this,
but there are simply too many upsides. I will perhaps add a way to
configure the details of the light and dark palettes for people that
need it. This dialog could theoretically have a button to try to import
the standard system palette automatically to create the custom palette.
This commit is contained in:
Kovid Goyal 2024-02-04 11:52:10 +05:30
parent 3c70c1d90b
commit 085862b062
No known key found for this signature in database
GPG Key ID: 06BC317B515ACE7C
1 changed files with 48 additions and 196 deletions
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240
src/calibre/gui2/palette.py
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@ -5,8 +5,8 @@ import os
import sys import sys
from contextlib import contextmanager from contextlib import contextmanager
from qt.core import ( from qt.core import (
QAbstractNativeEventFilter, QApplication, QColor, QIcon, QPalette, QSettings, QProxyStyle, QApplication, QByteArray, QColor, QDataStream, QIcon, QIODeviceBase, QObject,
QStyle, Qt, QTimer, pyqtSlot, QObject, QDataStream, QByteArray, QIODeviceBase QPalette, QProxyStyle, QStyle, Qt
) )
from calibre.constants import DEBUG, dark_link_color, ismacos, iswindows from calibre.constants import DEBUG, dark_link_color, ismacos, iswindows
@ -14,7 +14,7 @@ from calibre.constants import DEBUG, dark_link_color, ismacos, iswindows
dark_link_color = QColor(dark_link_color) dark_link_color = QColor(dark_link_color)
dark_color = QColor(45,45,45) dark_color = QColor(45,45,45)
dark_text_color = QColor('#ddd') dark_text_color = QColor('#ddd')
light_color = QColor(0xef, 0xef, 0xef) light_color = QColor(0xf0, 0xf0, 0xf0)
light_text_color = QColor(0,0,0) light_text_color = QColor(0,0,0)
light_link_color = QColor(0, 0, 255) light_link_color = QColor(0, 0, 255)
@ -28,49 +28,6 @@ class UseCalibreIcons(QProxyStyle):
return ic return ic
if iswindows:
import ctypes
class WinEventFilter(QAbstractNativeEventFilter):
def nativeEventFilter(self, eventType, message):
if eventType == b"windows_generic_MSG":
msg = ctypes.wintypes.MSG.from_address(message.__int__())
# https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-settingchange
if msg.message == 0x001A and msg.lParam: # WM_SETTINGCHANGE
try:
s = ctypes.wstring_at(msg.lParam)
except OSError:
pass
else:
if s == 'ImmersiveColorSet':
QApplication.instance().palette_manager.check_for_windows_palette_change()
# prevent Qt from handling this event
return True, 0
return False, 0
if not iswindows and not ismacos:
from qt.dbus import QDBusConnection, QDBusMessage, QDBusVariant
def windows_is_system_dark_mode_enabled():
s = QSettings(r"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize", QSettings.Format.NativeFormat)
if s.status() == QSettings.Status.NoError:
return s.value("AppsUseLightTheme") == 0
return False
def linux_is_system_dark_mode_enabled():
bus = QDBusConnection.sessionBus()
m = QDBusMessage.createMethodCall(
'org.freedesktop.portal.Desktop', '/org/freedesktop/portal/desktop',
'org.freedesktop.portal.Settings', 'Read'
)
m.setArguments(['org.freedesktop.appearance', 'color-scheme'])
reply = bus.call(m, timeout=1000)
a = reply.arguments()
return len(a) and isinstance(a[0], int) and a[0] == 1
def palette_is_dark(self): def palette_is_dark(self):
col = self.color(QPalette.ColorRole.Window) col = self.color(QPalette.ColorRole.Window)
return max(col.getRgb()[:3]) < 115 return max(col.getRgb()[:3]) < 115
@ -107,17 +64,6 @@ QPalette.serialize_as_python = serialize_palette_as_python
QPalette.unserialize_from_bytes = unserialize_palette QPalette.unserialize_from_bytes = unserialize_palette
def fix_palette_colors(p):
if iswindows:
# On Windows the highlighted colors for inactive widgets are the
# same as non highlighted colors. This is a regression from Qt 4.
# https://bugreports.qt-project.org/browse/QTBUG-41060
for role in (QPalette.ColorRole.Highlight, QPalette.ColorRole.HighlightedText, QPalette.ColorRole.Base, QPalette.ColorRole.AlternateBase):
p.setColor(QPalette.ColorGroup.Inactive, role, p.color(QPalette.ColorGroup.Active, role))
return True
return False
def dark_palette(): def dark_palette():
p = QPalette() p = QPalette()
disabled_color = QColor(127,127,127) disabled_color = QColor(127,127,127)
@ -135,6 +81,7 @@ def dark_palette():
p.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ButtonText, disabled_color) p.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ButtonText, disabled_color)
p.setColor(QPalette.ColorRole.BrightText, Qt.GlobalColor.red) p.setColor(QPalette.ColorRole.BrightText, Qt.GlobalColor.red)
p.setColor(QPalette.ColorRole.Link, dark_link_color) p.setColor(QPalette.ColorRole.Link, dark_link_color)
p.setColor(QPalette.ColorRole.LinkVisited, Qt.GlobalColor.darkMagenta)
p.setColor(QPalette.ColorRole.Highlight, QColor(0x0b, 0x45, 0xc4)) p.setColor(QPalette.ColorRole.Highlight, QColor(0x0b, 0x45, 0xc4))
p.setColor(QPalette.ColorRole.HighlightedText, dark_text_color) p.setColor(QPalette.ColorRole.HighlightedText, dark_text_color)
@ -144,93 +91,30 @@ def dark_palette():
def light_palette(): # {{{ def light_palette(): # {{{
# generated by serializing the light palette on my Linux system p = QPalette()
self = QPalette() disabled_color = QColor(120,120,120)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.WindowText, QColor(0, 0, 0, 255)) p.setColor(QPalette.ColorRole.Window, light_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Button, QColor(239, 239, 239, 255)) p.setColor(QPalette.ColorRole.WindowText, light_text_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Light, QColor(255, 255, 255, 255)) p.setColor(QPalette.ColorRole.PlaceholderText, disabled_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Midlight, QColor(202, 202, 202, 255)) p.setColor(QPalette.ColorRole.Base, Qt.GlobalColor.white)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Dark, QColor(159, 159, 159, 255)) p.setColor(QPalette.ColorRole.AlternateBase, QColor(245, 245, 245))
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Mid, QColor(184, 184, 184, 255)) p.setColor(QPalette.ColorRole.ToolTipBase, light_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Text, QColor(0, 0, 0, 255)) p.setColor(QPalette.ColorRole.ToolTipText, light_text_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.BrightText, QColor(255, 255, 255, 255)) p.setColor(QPalette.ColorRole.Text, light_text_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.ButtonText, QColor(0, 0, 0, 255)) p.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Text, disabled_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Base, QColor(255, 255, 255, 255)) p.setColor(QPalette.ColorRole.Button, light_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Window, QColor(239, 239, 239, 255)) p.setColor(QPalette.ColorRole.ButtonText, light_text_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Shadow, QColor(118, 118, 118, 255)) p.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ButtonText, disabled_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Highlight, QColor(48, 140, 198, 255)) p.setColor(QPalette.ColorRole.BrightText, Qt.GlobalColor.red)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.HighlightedText, QColor(255, 255, 255, 255)) p.setColor(QPalette.ColorRole.Link, light_link_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.Link, QColor(0, 0, 255, 255)) p.setColor(QPalette.ColorRole.LinkVisited, Qt.GlobalColor.magenta)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.LinkVisited, QColor(255, 0, 255, 255))
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.AlternateBase, QColor(247, 247, 247, 255)) p.setColor(QPalette.ColorRole.Highlight, QColor(48, 140, 198))
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.ToolTipBase, QColor(255, 255, 220, 255)) p.setColor(QPalette.ColorRole.HighlightedText, Qt.GlobalColor.white)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.ToolTipText, QColor(0, 0, 0, 255)) p.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.HighlightedText, disabled_color)
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.PlaceholderText, QColor(0, 0, 0, 128))
self.setColor(QPalette.ColorGroup.Active, QPalette.ColorRole.NoRole, QColor(0, 0, 0, 255)) return p
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.WindowText, QColor(190, 190, 190, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Button, QColor(239, 239, 239, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Light, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Midlight, QColor(202, 202, 202, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Dark, QColor(190, 190, 190, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Mid, QColor(184, 184, 184, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Text, QColor(190, 190, 190, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.BrightText, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ButtonText, QColor(190, 190, 190, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Base, QColor(239, 239, 239, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Window, QColor(239, 239, 239, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Shadow, QColor(177, 177, 177, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Highlight, QColor(145, 145, 145, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.HighlightedText, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.Link, QColor(0, 0, 255, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.LinkVisited, QColor(255, 0, 255, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.AlternateBase, QColor(247, 247, 247, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ToolTipBase, QColor(255, 255, 220, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.ToolTipText, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.PlaceholderText, QColor(0, 0, 0, 128))
self.setColor(QPalette.ColorGroup.Disabled, QPalette.ColorRole.NoRole, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.WindowText, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Button, QColor(239, 239, 239, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Light, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Midlight, QColor(202, 202, 202, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Dark, QColor(159, 159, 159, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Mid, QColor(184, 184, 184, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Text, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.BrightText, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.ButtonText, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Base, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Window, QColor(239, 239, 239, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Shadow, QColor(118, 118, 118, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Highlight, QColor(48, 140, 198, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.HighlightedText, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.Link, QColor(0, 0, 255, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.LinkVisited, QColor(255, 0, 255, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.AlternateBase, QColor(247, 247, 247, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.ToolTipBase, QColor(255, 255, 220, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.ToolTipText, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.PlaceholderText, QColor(0, 0, 0, 128))
self.setColor(QPalette.ColorGroup.Inactive, QPalette.ColorRole.NoRole, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.WindowText, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Button, QColor(239, 239, 239, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Light, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Midlight, QColor(202, 202, 202, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Dark, QColor(159, 159, 159, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Mid, QColor(184, 184, 184, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Text, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.BrightText, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.ButtonText, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Base, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Window, QColor(239, 239, 239, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Shadow, QColor(118, 118, 118, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Highlight, QColor(48, 140, 198, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.HighlightedText, QColor(255, 255, 255, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.Link, QColor(0, 0, 255, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.LinkVisited, QColor(255, 0, 255, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.AlternateBase, QColor(247, 247, 247, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.ToolTipBase, QColor(255, 255, 220, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.ToolTipText, QColor(0, 0, 0, 255))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.PlaceholderText, QColor(0, 0, 0, 128))
self.setColor(QPalette.ColorGroup.Current, QPalette.ColorRole.NoRole, QColor(0, 0, 0, 255))
return self
# }}} # }}}
@ -272,7 +156,6 @@ class PaletteManager(QObject):
color_palette: str color_palette: str
has_fixed_palette: bool has_fixed_palette: bool
using_calibre_style: bool using_calibre_style: bool
original_palette_modified: bool
is_dark_theme: bool is_dark_theme: bool
def __init__(self, color_palette, ui_style, force_calibre_style, headless): def __init__(self, color_palette, ui_style, force_calibre_style, headless):
@ -291,13 +174,6 @@ class PaletteManager(QObject):
self.has_fixed_palette = self.color_palette != 'system' and self.using_calibre_style self.has_fixed_palette = self.color_palette != 'system' and self.using_calibre_style
args = [] args = []
if iswindows:
# passing darkmode=1 turns on dark window frames when windows
# is dark and darkmode=2 makes everything dark, but we have our
# own dark mode implementation when using calibre style so
# prefer that and use darkmode=1
args.append('-platform')
args.append('windows:darkmode=' + ('1' if self.using_calibre_style else '2'))
self.args_to_qt = tuple(args) self.args_to_qt = tuple(args)
if ismacos and not headless and self.has_fixed_palette: if ismacos and not headless and self.has_fixed_palette:
from calibre_extensions.cocoa import set_appearance from calibre_extensions.cocoa import set_appearance
@ -309,33 +185,29 @@ class PaletteManager(QObject):
if not self.using_calibre_style and app.style().objectName() == 'fusion': if not self.using_calibre_style and app.style().objectName() == 'fusion':
# Since Qt is using the fusion style anyway, specialize it # Since Qt is using the fusion style anyway, specialize it
self.using_calibre_style = True self.using_calibre_style = True
self.original_palette = QPalette(app.palette())
self.original_palette_modified = fix_palette_colors(self.original_palette)
if iswindows:
self.win_event_filter = WinEventFilter()
app.installNativeEventFilter(self.win_event_filter)
def setup_styles(self): def setup_styles(self):
if self.using_calibre_style: if self.using_calibre_style:
app = QApplication.instance()
system_is_dark = app.styleHints().colorScheme() == Qt.ColorScheme.Dark
app.styleHints().colorSchemeChanged.connect(self.color_scheme_changed)
if iswindows: if iswindows:
use_dark_palette = self.color_palette == 'dark' or (self.color_palette == 'system' and windows_is_system_dark_mode_enabled()) use_dark_palette = self.color_palette == 'dark' or (self.color_palette == 'system' and system_is_dark)
elif ismacos: elif ismacos:
use_dark_palette = self.color_palette == 'dark' use_dark_palette = self.color_palette == 'dark'
else: else:
use_dark_palette = self.color_palette == 'dark' or (self.color_palette == 'system' and linux_is_system_dark_mode_enabled()) use_dark_palette = self.color_palette == 'dark' or (self.color_palette == 'system' and system_is_dark)
bus = QDBusConnection.sessionBus()
bus.connect(
'org.freedesktop.portal.Desktop', '/org/freedesktop/portal/desktop',
'org.freedesktop.portal.Settings', 'SettingChanged', 'ssv', self.linux_desktop_setting_changed)
if use_dark_palette: if use_dark_palette:
self.set_dark_mode_palette() self.set_dark_mode_palette()
elif self.original_palette_modified: else:
self.set_palette(self.original_palette) self.set_light_mode_palette()
if self.has_fixed_palette and (self.color_palette == 'dark') != QApplication.instance().palette().is_dark_theme(): if self.has_fixed_palette and (self.color_palette == 'dark') != QApplication.instance().palette().is_dark_theme():
if self.color_palette == 'dark': if self.color_palette == 'dark':
self.set_dark_mode_palette() self.set_dark_mode_palette()
else: else:
self.set_light_mode_palette() self.set_light_mode_palette()
if self.has_fixed_palette:
QApplication.instance().setAttribute(Qt.ApplicationAttribute.AA_SetPalette, True)
if DEBUG: if DEBUG:
print('Using calibre Qt style:', self.using_calibre_style, file=sys.stderr) print('Using calibre Qt style:', self.using_calibre_style, file=sys.stderr)
@ -418,29 +290,17 @@ QTabBar::tab:only-one {
def set_light_mode_palette(self): def set_light_mode_palette(self):
self.set_palette(light_palette()) self.set_palette(light_palette())
if not iswindows and not ismacos: def color_scheme_changed(self, new_color_scheme):
@pyqtSlot(str, str, QDBusVariant) if DEBUG:
def linux_desktop_setting_changed(self, namespace, key, val): print('System Color Scheme changed to:', new_color_scheme, file=sys.stderr)
if (namespace, key) == ('org.freedesktop.appearance', 'color-scheme'):
if self.has_fixed_palette: if self.has_fixed_palette:
return return
use_dark_palette = val.variant() == 1 if new_color_scheme == Qt.ColorScheme.Dark:
if use_dark_palette != bool(self.is_dark_theme):
if use_dark_palette:
self.set_dark_mode_palette() self.set_dark_mode_palette()
else: elif new_color_scheme == Qt.ColorScheme.Light:
self.set_palette(self.original_palette) self.set_light_mode_palette()
self.on_palette_change() elif new_color_scheme == Qt.ColorScheme.Unknown:
self.set_light_mode_palette()
def check_for_windows_palette_change(self):
if self.has_fixed_palette:
return
use_dark_palette = bool(windows_is_system_dark_mode_enabled())
if bool(self.is_dark_theme) != use_dark_palette:
if use_dark_palette:
self.set_dark_mode_palette()
else:
self.set_palette(self.original_palette)
self.on_palette_change() self.on_palette_change()
@contextmanager @contextmanager
@ -455,14 +315,6 @@ QTabBar::tab:only-one {
def set_palette(self, pal): def set_palette(self, pal):
with self.changing_palette(): with self.changing_palette():
QApplication.instance().setPalette(pal) QApplication.instance().setPalette(pal)
# Needed otherwise Qt does not emit the paletteChanged signal when
# appearance is changed. And it has to be after current event
# processing finishes as of Qt 5.14 otherwise the palette change is
# ignored.
QTimer.singleShot(1000, self.mark_palette_as_unchanged_for_qt)
def mark_palette_as_unchanged_for_qt(self):
QApplication.instance().setAttribute(Qt.ApplicationAttribute.AA_SetPalette, False)
def on_qt_palette_change(self): def on_qt_palette_change(self):
if self.ignore_palette_changes: if self.ignore_palette_changes:
@ -472,7 +324,7 @@ QTabBar::tab:only-one {
if DEBUG: if DEBUG:
print('ApplicationPaletteChange event received', file=sys.stderr) print('ApplicationPaletteChange event received', file=sys.stderr)
if self.has_fixed_palette: if self.has_fixed_palette:
pal = dark_palette() if self.color_palette == 'dark' else self.original_palette pal = dark_palette() if self.color_palette == 'dark' else light_palette()
if QApplication.instance().palette().color(QPalette.ColorRole.Window) != pal.color(QPalette.ColorRole.Window): if QApplication.instance().palette().color(QPalette.ColorRole.Window) != pal.color(QPalette.ColorRole.Window):
if DEBUG: if DEBUG:
print('Detected a spontaneous palette change by Qt, reverting it', file=sys.stderr) print('Detected a spontaneous palette change by Qt, reverting it', file=sys.stderr)