Abap objects and selection screen

Question

Hello everybody,
I am interested in your ways of implementing selection-screens in the style of ABAP Objects.
In earlier times (when I used to implement ABAP objects in a procedural way) I just put the selection-screen commands in an include or a form routine of my ABAP report. So it was possible to run the report in background.
Now I read something about selection-screens/dynpros and "separation of concerns" in the book "ABAP Objects" written by Keller. He advises using function groups to encapsulate presentation from logical matters. (Selection-screen commands are in an automatically generated include now). I implemented this way. (ABAP report with a local class, which has a main method, where function module of the function group is called). It works, but i see no chance to run my report in background now.. but I need to run the report in background.
Does anybody know a solution without deleting function group?
What do you think is the best way of using selection-screen-commands and ABAP Objects, especially regarding running in background?
Thx for your advise in advance.
Kind regards,
Anne

Answer 1

Hi Naimesh,
thx for explanation. I am not sure, if I understood everything in the right way.
Where do you write the code for building the selection-screen? (PARAMETERS, SELECT-OPTIONS etc.)
If you write these commands in a class method, you will get a syntax error ( because it's forbidden per definition of ABAP objects). So, am I right assuming that you put the coding just at the beginning of the ABAP report ? And after START-OF-SELECTION-event you start the processing... ?
Furthermore, I don't really understand why you create an separate class for ALV. I found your "SAP abap help"-blog, where you explained the concept of MVC ((By the way, well done!), but you didn't mention an "ALV class" there..
Mh.. another question - have you ever combined MVC with object services?
At the moment I'm working on a software project where I use object services. I created 2 persistent classes via SE24 and one local class in my ABAP Report.
I don't really see possibility to implement MVC in this project without change very much of coding and class structure...
In my opinion the M (data&business logic) are my existing global classes and my local class is kind of Controller class?!
Thx in advance,
Anne