Need 2 widgets without a parent to comunicate

[boblatino]

If you do that your app will crash.

I also have the same idea, only one thread should be the graphical thread. So how can I solve the problem:

inactive window (hidden) takes the focus instead of the one that is shown the first time? After just a click the shown window it will regain focus and work.

Thanks
Ramiro

[wysota]

So how can I solve the problem

First determine what exactly happens. It could be you are not letting the events be processed and something doesn't know it should release (or gain) focus, i.e. you can't have a focus on a widget which is hidden, so if you do:

widget->show();
widget->setFocus(Qt::OtherFocusReason);

widget->show();
widget->setFocus(Qt::OtherFocusReason);

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it will probably not work but this might:

widget->show();
QCoreApplication::processEvents();
widget->setFocus(Qt::OtherFocusReason);

widget->show();
QCoreApplication::processEvents();
widget->setFocus(Qt::OtherFocusReason);

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[boblatino]

it will probably not work but this might:

widget->show();
QCoreApplication::processEvents();
widget->setFocus(Qt::OtherFocusReason);

widget->show();
QCoreApplication::processEvents();
widget->setFocus(Qt::OtherFocusReason);

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Thanks wysota, it does work now perfectly. I dont know why processEvents is required to avoid sending events to the hidden window but it WORKS! Thanks a lot to all the forum members that have posted here.

Ramiro