Font Scaling
BCGControlBar Pro (MFC)
BCGSuite (MFC)
BCGControlBar for .NET
There is a built-in support for font size changing using mouse wheel and touch gesture zoom events. In addition, developer may specify Zoom in/Zoom out commands for setting required font size.
Sample code:
// Allow scaling between 20% and 300%:
m_wndEdit.SetScalingRange(0.2, 3.0);