View Full Version : Notify style change to all Qt apps

20th January 2017, 10:37
Hi all,

I'm writing a themable style engine (QStyle derived). This style comes with a custom app that allows to tweak it. I'd like to notify all Qt apps of style/config changes when I press "apply" button on my app.

I searched a lot and all I can find is the following code from KDE that does not work:

void ThemeManagerUI::notifyConfigurationChange()
qDebug() << "notifyConfigurationChange()";

QByteArray stamp;
QDataStream s(&stamp, QIODevice::WriteOnly);
s << QDateTime::currentDateTime();

QByteArray settings_atom_name("_QT_SETTINGS_TIMESTAMP_");
settings_atom_name += XDisplayString(QX11Info::display());

xcb_connection_t *xcb_conn = QX11Info::connection();
xcb_intern_atom_cookie_t cookie = xcb_intern_atom(xcb_conn, false, settings_atom_name.size(), settings_atom_name.constData());
xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(xcb_conn, cookie, 0);
xcb_atom_t atom = reply->atom;

xcb_change_property(xcb_conn, XCB_PROP_MODE_REPLACE, QX11Info::appRootWindow(), atom, XCB_ATOM_ATOM,
8, stamp.size(), (const void *)stamp.constData());

//XChangeProperty(QX11Info::display(), QX11Info::appRootWindow(0),
//PropModeReplace, (unsigned char *)stamp.data(), stamp.size());

This code is from KDE KStyle KCM module but I have no luck. Do you have any idea ?

Thank you

21st January 2017, 12:38
Maybe your style plugin needs to react to this somehow?