Filter Chaining

The AcEdInputPointFilter class provides a member function to support chaining input point filters. Since only one filter can be active at a time, this function allows you to query the current filter, embed that filter in your custom filter, and then revoke the current filter and register your own. The following function provides the chaining functionality:

AcEdInputFilter *
AcEdInputPointFilter::revokeFilter(AcEdInputPointFilter *);