Question

I am new to Qt Programming, but I have basic on C++.

I want to update my GUI while it is processing, example:

while (....)
{

        do some calculation...

        if (condition fulfill)

            change the color of label.
}

However, I realise that I failed to get the result I want (update the GUI while processing). The GUI will only update after the while loop.
Why is it so? Anyone can help?

In addition, I wish to “slower” the color change since the processing is too fast and I can’t see the animation. Any idea to do it?

Thank you very much!

Clarification:
Actually I wish to update the GUI while I am processing…Meaning that, if I have 100 iteration, after each iteration I wish to update the GUI immediately.

Answer 1

You have to place your processing code to another thread and update the gui, because like this GUI will be waiting for your process to end and will refresh after its end

read more here:
http://www.qtcentre.org/threads/41545-How-to-refresh-GUI-while-heavy-processing-is-ongoing
http://www.qtcentre.org/threads/32416-Update-GUI-from-another-thread
Forcing the Qt GUI to update