In this post I am going to share a Qt widget that allows full control (view and control) of VNC servers over TCP/IP. Using it is as simple as dropping a QWidget on your user interface and then promoting it to QVNCClientWidget. I needed this recently but was not able to find a Qt widget or any other Qt/C++ code for that matter, that supports VNC Authentication and can be used in a real cross-platform way. So I had to gather and write this widget piece by piece and make sure it build on all platforms supported by Qt.
Qt does not have mouse hover, or mouse over (as some people call it) events in its widgets by default but it provides the means to do it quite easily if you just know how to inherit a class and add some protected functions to it. Here is an example that shows how to create a push button (QPushButton) that reacts to mouse hover events.