Is it possible to define the TYPE_CONSTANT of a derived class?

Question

With the SalGetFirstChild(Handle, TYPE_CONSTANT) function you can recieve the first child of the given handle. For this TYPE_CONSTANT can be a table, data field, radio-button and so on.

My question now is, if it's possible to redfine this TYPE for own classes derived from an upper class, e.g. two differend subclasses of a data field?

If yes - how can this be done? I didn't find any further comment on this TYPES in the gupta help aside from the main entry (which consists of a list of predefined TYPES) and the two entries for SalGetFirstChildand SalGetNextChild.

Answer 1

Proclaimer: My knowledge of the TD ends with version 2.1
I don't think you can introduce new type constants. If you are searching for descendants of a user defined datafield class, you could use the TYPE_DataField constant to get the child handle and then e.g. check with

SalWindowIsDerivedFromClass(childHandle, myDatafieldClass)   

if the child window is of the desired type.