Loop at UI Elements

Hi Gurus,

I want to loop over all InputFields, check if they are enabled/not read only and empty. If a field is found, the cursor should be set on this field.

In classic abap it is done like this:

loop at screen.

if screen-input eq 1.

assign (screen-name) to <g1>.

if sy-subrc eq 0 and <g1> is initial.

set cursor field screen-name.

exit.

endif.

endif.

endloop.

I already know how can is set the cursor. But how can I do the loop?

Thanks in advance.

BR,

Alfons