SoEventCallback.h.3coin4 - Man Page

class SoEventCallback
The SoEventCallback class provides functionality for catching events.

typedef void SoEventCallbackCB(void *userdata, SoEventCallback *node)

Callback functions for SoEventCallback::addEventCallback() must be of this type. userdata is the last argument to SoEventCallback::addEventCallback(), and node is of course the SoEventCallback node in the scenegraph which caused the invocation of the callback.