How to execute a time-consuming task without UI pause?

I create a button,and use
connect(button, SIGNAL(clicked()),this, SLOT(process() )) ,
In process(),there is a loop,for example,1...1000000.
when I click the button,the UI pause.

How to deal with it? thank you.

That depends on what the processing is and what level of control you have over it.

For a fair sized discussion of this topic see Keeping the GUI Responsive. That was written a few years ago before Qt5 but all the same considerations apply.

Quote:

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Keeping the GUI Responsive.

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I hope the folks at Qt realize the value of Wysota's article and continue to keep it available in the archives. As do you, whenever I see a post like the above my first thought is, refer them to this article. I have a PDF version, so I guess if the archive post goes away, I can upload that when needed.

Thank you very much.I'll read this article.