Method resolveTheme

common/themes/theme_manager.cpp:68–125

}

void ThemeManager::resolveTheme()
{
    if (!config)
        return;

    const auto &sel = config->selection();
    const ThemeVariant systemVariant = themeVariantFromColorScheme(qGuiApp->styleHints()->colorScheme());

    QString id;
    ThemeVariant fallbackVariant;
    switch (sel.mode) {
    case ThemeMode::FollowSystem: {
        const bool isDark = (systemVariant == ThemeVariant::Dark);
        id = isDark ? sel.darkThemeId : sel.lightThemeId;
        fallbackVariant = systemVariant;
        break;
    }
    case ThemeMode::Light:
        id = sel.lightThemeId;
        fallbackVariant = ThemeVariant::Light;
        break;
    case ThemeMode::Dark:
        id = sel.darkThemeId;
        fallbackVariant = ThemeVariant::Dark;
        break;
    case ThemeMode::ForcedTheme:
        id = sel.fixedThemeId;
        fallbackVariant = systemVariant;
        break;
    }

    const Theme theme = themeFromId(id, fallbackVariant);

    // Sync Qt's application-level color scheme so native widgets (menus, scrollbars,
    // standard dialogs) use the correct palette before themeChanged() is emitted.
#if QT_VERSION >= QT_VERSION_CHECK(6, 8, 0)
    Qt::ColorScheme scheme;
    switch (sel.mode) {
    case ThemeMode::FollowSystem:
        scheme = Qt::ColorScheme::Unknown; // delegate to OS
        break;
    case ThemeMode::Light:
        scheme = Qt::ColorScheme::Light;
        break;
    case ThemeMode::Dark:
        scheme = Qt::ColorScheme::Dark;
        break;
    case ThemeMode::ForcedTheme:
        scheme = (theme.meta.variant == ThemeVariant::Dark)
                ? Qt::ColorScheme::Dark
                : Qt::ColorScheme::Light;
        break;
    }
    qGuiApp->styleHints()->setColorScheme(scheme);
#endif

    setTheme(theme);
}