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Code Issues 1.1k Packages Projects Releases 20 Wiki Activity

Qt: Use colorScheme() for dark mode detection on system themes

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Stenzek
2025-09-10 21:52:43 +10:00
parent 7bf3b7931b
commit 96c90a4acd
1 changed files with 40 additions and 19 deletions
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59
src/duckstation-qt/qtthemes.cpp
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@@ -9,17 +9,28 @@
#include <QtCore/QFile>
#include <QtGui/QPalette>
#include <QtGui/QStyleHints>
#include <QtWidgets/QApplication>
#include <QtWidgets/QStyle>
#include <QtWidgets/QStyleFactory>
namespace QtHost {
static void SetStyleFromSettings();
} // namespace QtHost
static QString s_unthemed_style_name;
static QPalette s_unthemed_palette;
static bool s_unthemed_style_name_set;
namespace {
struct State
{
std::string current_theme_name;
QString unthemed_style_name;
QPalette unthemed_palette;
bool unthemed_style_name_set = false;
bool is_variable_color_style = false;
};
} // namespace
static State s_state;
} // namespace QtHost
const char* QtHost::GetDefaultThemeName()
{
@@ -28,11 +39,11 @@ const char* QtHost::GetDefaultThemeName()
void QtHost::UpdateApplicationTheme()
{
if (!s_unthemed_style_name_set)
if (!s_state.unthemed_style_name_set)
{
s_unthemed_style_name_set = true;
s_unthemed_style_name = QApplication::style()->objectName();
s_unthemed_palette = QApplication::palette();
s_state.unthemed_style_name_set = true;
s_state.unthemed_style_name = QApplication::style()->objectName();
s_state.unthemed_palette = QApplication::palette();
}
SetStyleFromSettings();
@@ -42,11 +53,12 @@ void QtHost::UpdateApplicationTheme()
void QtHost::SetStyleFromSettings()
{
const TinyString theme = Host::GetBaseTinyStringSettingValue("UI", "Theme", QtHost::GetDefaultThemeName());
s_state.is_variable_color_style = false;
if (theme == "qdarkstyle")
{
qApp->setStyle(s_unthemed_style_name);
qApp->setPalette(s_unthemed_palette);
qApp->setStyle(s_state.unthemed_style_name);
qApp->setPalette(s_state.unthemed_palette);
qApp->setStyleSheet(QString());
QFile f(QStringLiteral(":qdarkstyle/style.qss"));
@@ -55,8 +67,9 @@ void QtHost::SetStyleFromSettings()
}
else if (theme == "fusion")
{
s_state.is_variable_color_style = true;
qApp->setStyle(QStyleFactory::create("Fusion"));
qApp->setPalette(s_unthemed_palette);
qApp->setPalette(s_state.unthemed_palette);
qApp->setStyleSheet(QString());
}
else if (theme == "darkfusion")
@@ -370,31 +383,39 @@ void QtHost::SetStyleFromSettings()
else if (theme == "windowsvista")
{
qApp->setStyle(QStyleFactory::create("windowsvista"));
qApp->setPalette(s_unthemed_palette);
qApp->setPalette(s_state.unthemed_palette);
qApp->setStyleSheet(QString());
}
#endif
else
{
qApp->setStyle(s_unthemed_style_name);
qApp->setPalette(s_unthemed_palette);
s_state.is_variable_color_style = true;
qApp->setStyle(s_state.unthemed_style_name);
qApp->setPalette(s_state.unthemed_palette);
qApp->setStyleSheet(QString());
#ifdef __APPLE__
// This is super jank. The native theme on MacOS does not set AlternateBase like the Windows/Fusion themes do, but
// instead overrides it in QAbstractItemView. Since this is the only place that AlteranteBase is used, just copy it
// across. Why do we need this? Because we're using AlternateBase in hotkey bindings dialog to draw rows manually.
s_unthemed_palette.setColor(QPalette::AlternateBase,
qApp->palette("QAbstractItemView").color(QPalette::AlternateBase));
qApp->setPalette(s_unthemed_palette);
s_state.unthemed_palette.setColor(QPalette::AlternateBase,
qApp->palette("QAbstractItemView").color(QPalette::AlternateBase));
qApp->setPalette(s_state.unthemed_palette);
#endif
}
}
bool QtHost::IsDarkApplicationTheme()
{
QPalette palette = qApp->palette();
return (palette.windowText().color().value() > palette.window().color().value());
if (s_state.is_variable_color_style)
{
return (qApp->styleHints()->colorScheme() == Qt::ColorScheme::Dark);
}
else
{
const QPalette palette = qApp->palette();
return (palette.windowText().color().value() > palette.window().color().value());
}
}
void QtHost::SetIconThemeFromStyle()