QProgressIndicator is a Loading/Busy indicator widget for Qt
Copy QProgressIndicator.h and QProgressIndicator.cpp to your project.
Comes with a test program (main.cpp, Example.h, Example.cpp)
Download the latest code using 'clone'.
% git clone https://github.com/epasveer/QProgressIndicator
Setup cmake and build
% cd QProgressIndicator/src
% cd build
% cmake ..
% make
Install it (or not), which will usually copy it to /usr/local/bin. May need root access.
% cd QProgressIndicator/src/build
% sudo make install
QProgressIndicator source code is licensed under the Apache License, Version 2.0.
Based on the original code from Derek Ray.