dotnka said:
@shaanveer I was surprised to see that you are correct, a lot of those libraries don't allow absolute widget positioning.
Take a look into this one: https://github.com/wjakob/nanogui
On the base Widget class there is a void setPosition(const Vector2i &pos) method to allow precise positioning in the parent container. It should cover your needs.
Thanks a lot. What is the libraries name