On 31 Jan 2014, at 5:49 PM, John Weeks wrote:
> Thanks for your comments, Konrad.
>
> Part of my question is driven by the fact that our currently-shipping non-Qt
> version puts up windows while it's not the active application and this does
> not make the application activate. We run on both Macintosh and Windows. So
> the fact that Qt applications do this makes me believe that this is a Qt
> thing. Since that is the case, surely there's a Qt way to avoid doing
> something that the underlying OS isn't doing.
>
>> Why open windows at all if you do not intend to actually show the customer
>> anything until you are done?
>
> Have you worked with scientists? :) Our customers may run a process that
> creates literally hundreds of graphs, each in a window, by running an
> automated process.
>
> Our customers can write code in our internal language to do very lengthy
> computations analyzing their data. Part of that might include creating a
> graph (in a window!) showing the result of some part of the analysis, or of
> one of many data sets. Being able to see that graph come up allows them to
> monitor the progress of the analysis; having it come up while the application
> is not the active application allows them to compose e-mail, browse the web,
> etc., during an analysis that might take many minutes or even hours or days.
>
> So, no, it wouldn't work to make the windows minimized.
>
> At the end of the process they want a collection of graphs that will most
> likely then wind up as the basis for a report or a published paper.
>
> And, again, Windows and Mac OS X aren't doing this- why does Qt do it?
I suspect that for some reason QWindow::requestActivate() is getting called;
you can set a breakpoint there and look at the backtrace to find out why. But
I tried that myself, using code like this
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
MainWindow w2;
QTimer t;
t.singleShot(5000, &w2, SLOT(show()));
return a.exec();
}
and I don't see the problem, at least not on OSX. After the first window
appears, I can bring another application into the foreground, then after 5
seconds the second window will show up in the background without activating the
application. Even if w2 is a QDialog rather than a QMainWindow it still
doesn't interrupt.
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