First, we calculate the percentage of the download progress. The calculated progress value will range from 0 (0%) to 1 (100%). Then, we set the new value for the progress bar where progressBar is the pointer to this bar. However, what value will progressBar->maximum() have and where do we set the range for the progress bar? What is nice is that you do not have to set it for every new download. It is only done once, for example, in the constructor of the class containing the bar. As range values, we would recommend this:
progressBar->setRange(0, 2048);
The reason is that if you take, for example, a range of 0 to 100 and the progress bar is 500 pixels wide, the bar would jump 5 pixels forward for every value change. This ...
