Corrected bring application to front

AndrzejB

I have Mint 21 Cinnamon.
I am searching way for full handling one instance for my editor.
it is promising itay-grudev/SingleApplication , example Calculator.
Messages are sended and received, only one bad thing: first instance instead of bringing to front, only blink icon on taskbar.
(but QMessageBox::warning caused bringing to front!)
For compare, my very old editor in Pascal with Synedit go to front correctly.
Here is code:

procedure TGtk2WidgetSet.AppBringToFront;
begin
  if Assigned(Application.MainForm) and Application.MainForm.HandleAllocated then
  begin
    gdk_window_raise({%H-}PGtkWidget(Application.MainForm.Handle)^.window);
    gdk_window_focus({%H-}PGtkWidget(Application.MainForm.Handle)^.window,
                                gtk_get_current_event_time);
  end;
end;

But this is not compatible with Qt
Is other example from Kate editor:
https://github.com/KDE/kate/blob/e796092e5229c441a56804d53cdcc055fe080a52/apps/lib/kateappadaptor.cpp#L31

 // like QtSingleApplication
    win->setWindowState(win->windowState() & ~Qt::WindowMinimized);
    win->raise();
    win->activateWindow();

    // try to raise window, see bug 407288
    win->setAttribute(Qt::WA_NativeWindow, true);
    KStartupInfo::setNewStartupId(win->windowHandle(), KStartupInfo::startupId());
    KWindowSystem::setCurrentXdgActivationToken(token);
    KWindowSystem::activateWindow(win->effectiveWinId());

I apply almost all in my application, but token, I don't know which should be token.

AndrzejB

Good result is using command wmctrl
https://stackoverflow.com/questions/73309270/bring-my-application-window-to-screen-front-in-mint/73360255#73360255
there is also pure C++ solution without execute binary.

ChrisW67

The example provided works within the limitations of the X11 window manager your user has. This is described in the QWidget::activateWindow docs. The example calls activatewindow() and raise(), but it still controlled by the window manager.

On my KDE desktop the window is not activated/raised because of the default "Focus stealing prevention" settings. Setting "None" takes the window manager out of the equation and the application is activated/raised.

I imagine that the window manager in Cinnamon has a similar setting.

There is no point trying to copy-and-paste code from a GTK or KDE application unless your application already a GTK or KDE application.

AndrzejB

Good result is using command wmctrl
https://stackoverflow.com/questions/73309270/bring-my-application-window-to-screen-front-in-mint/73360255#73360255
there is also pure C++ solution without execute binary.