ImageGear for C and C++ on Windows v19.10 - Updated
Mouse Events
User Guide > How to Work with... > Annotations > New Annotation API: ArtX > How to... > Manage Annotations > Mouse Events

Event handlers are implemented in the ART GUI open source code and can be modified at any time and in any way. To enable ART GUI event handlers, your application needs to interact with the following HIG_ARTX_ACTION functions: