Notify style change to all Qt apps

[dextermagnific]

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;
  free(reply);
 
  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),
                  //ATOM(_QT_SETTINGS_TIMESTAMP), ATOM(_QT_SETTINGS_TIMESTAMP), 8,
                  //PropModeReplace, (unsigned char *)stamp.data(), stamp.size());
}

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;
  free(reply);

  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),
                  //ATOM(_QT_SETTINGS_TIMESTAMP), ATOM(_QT_SETTINGS_TIMESTAMP), 8,
                  //PropModeReplace, (unsigned char *)stamp.data(), stamp.size());
}

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

Thank you

[anda_skoa]

Maybe your style plugin needs to react to this somehow?

Cheers,
_