This is a followup post for my previous pan/zoom post. It is so difficult to find a proper widget that implements Zoom with mouse wheel and pan with CTRL+LeftClick. IMO, it is something that is necessary when viewing an image. I finally found a QT implementation that was fast and simple to understand. Here is the link to the Stack Overflow discussion. Hopefully this post will increase the likelihood of ppl finding a good solution in QT for this issue.