Access to components of UI from the function of QtConcurrent::run(foo)

[MohammadReza]

Hello friends,

I want to access to components of UI (like as QLineEdit, QLabel, QTableView, etc) from the "foo" function in QtConcurrent::run(foo).
But I cant, because the component must be static variable and I dont want.
How can I access to them?

Thanks a lot.
Ya Ali.

[SGaist]

Hi,

No, you can't because manipulating GUI element outside the main thread is not allowed. What you can do however is use signals and slots to communicate with the GUI stuff

[MohammadReza]

Hi dear SGaist,
Thanks for your response.

I searched and most of uses said signal and slot must be used.
I implemented this approach but did not work! Because I can`t emit the signal from the thread (because signal function is not static).
How can I do that? May you give a simple code?

Thanks.

[SGaist]

You can use a QObject wrapper class that will call the static function and then emit the signal needed

[MohammadReza]

Can you give me a simple code example?

[SGaist]

Wait, this might be a complication you don't need, did you took a look at the QFutureWatcher class ?