KDE Color Scheme

The current color scheme can be found in ~/.config/kdeglobals. Of particular interest are:

• [General]AccentColor, the raw accent color

• [General]ColorScheme, the base color scheme (which appears not to be defined in this file)

You can use kreadconfig5 to read these values.

Notifying changes

KGlobalSettings (apparently deprecated)

• https://invent.kde.org/plasma/plasma-workspace/-/blob/master/kcms/kcms-common_p.h#L37

enum GlobalChangeType {
    PaletteChanged = 0,
    FontChanged,
    StyleChanged, // 2
    SettingsChanged,
    IconChanged,
    CursorChanged, // 5
    ToolbarStyleChanged,
    ClipboardConfigChanged,
    BlockShortcuts,
    NaturalSortingChanged,
};

void notifyKcmChange(GlobalChangeType changeType, int arg)
{
    QDBusMessage message =
        QDBusMessage::createSignal(QStringLiteral("/KGlobalSettings"), QStringLiteral("org.kde.KGlobalSettings"), QStringLiteral("notifyChange"));
    message.setArguments({changeType, arg});
    QDBusConnection::sessionBus().send(message);
}

Watching changes

KConfigWatcher

• https://invent.kde.org/frameworks/kconfig/-/blob/master/src/core/kconfigwatcher.cpp

Just use inotify

This seems like the most reliable solution – just set up an inotify watch on ~/.config/kdeglobals

Reading the file

Use an INI parser such as inih or libconfini.