QtSingleApplication

[jacek]

Did you try to invoke the QWidget::activateWindow() method (together with raise())?

[mule]

Yes, I see I failed to copy&paste all the things I tried. Here they are:
activateWindow();
setFocus( Qt::OtherFocusReason );
show();
setWindowState( Qt::WindowActive );
update();
repaint();
setVisible( true );
raise();

As you can see, I was getting frustrated/desperate/confused ...

[jacek]

According to the docs, you should call QWidget::setActiveWindow() (or rather QApplication::setActiveWindow() as it should be written):

void QtSingleApplication::activateMainWidget () [virtual slot]
Calls QWidget::setActiveWindow() on this application's mainWidget(). This function does nothing if no main widget has been set.
This slot is typically connected to the messageReceived() signal.
See also messageReceived().

So such combo:

show();
raise();
activateWindow();

show();
raise();
activateWindow();

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should be enough. Maybe somebody else knows the answer, but you can always try the OS specific functions as the last resort.

[mule]

Thank you for your help, jacek, and thank you for redirecting me back to the doc. I had placed the doc aside a while back after many failed attempts and was just trying things by brute force and trial/error.

I need to go back and re-think this from the beginning. The doc mentions setMainWidget() and its relation to activateMainWidget(). Since setMainWidget() was abandoned from Qt3 to Qt4 (I am using Qt4) I was trying to do the equivalent with QMainWindow, setCentralWidget(), and such.

If/When I figure this out, I will post the solution.

Other input/thoughts/suggestions still welcome ...