CODEWITHSUNDEEP
c++qt
Ugo Lfe
Ugo Lfe

Reputation: 767

Why does qt show () not have priority?

I'm using Qt for an application. I would like to display a window then put a timer and display a second window. But currently the timer is done then the 2 windows open at the same time

this->firstWindow->show();
QTime dieTime = QTime::currentTime().addSecs(10);
while (QTime::currentTime() < dieTime);
this->secondWindow->show();

I tried a lot of solutions, like putting the show() of the firstwindow directly into the constructor but nothing works.

Upvotes: 1

Views: 162

Answers (1)

pschill
pschill

Reputation: 5579

You are using a blocking while loop to wait for the time to elapse, so the GUI thread cannot update the user interface. You could use QTimer for a non-blocking wait or refresh the GUI by adding qApp->processEvents(QEventLoop::AllEvents, 100); into the while loop.

I would prefer QTimer, because then you are not creating your own event loop. For example:

QTimer::singleShot(10000, this->secondWindow, SLOT(show()));

Upvotes: 3

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