ABAP_to_the_Future

Getting Started 10.1
FROM ztvc_monsters
INTO CORRESPONDING FIELDS OF TABLE gt_monsters.
"It is bad news to pass system variables as parameters
ld_repid = sy-repid.
CREATE OBJECT lo_view.
lo_view->prepare_display_data(
EXPORTING
id_report_name = ld_repid
" Calling program
id_variant = p_vari " Display Variant as specified by user
CHANGING
ct_data_table = gt_monsters ).
Listing 10.1 Generic Code to Call the Custom API
There is only method being called in Listing 10.1: the PREPARE_DISPLAY_DATA
method. This method is inherited from the abstract class and implemented in the
concrete class but has a totally generic nature. Listing 10.2 examines the coding
for this method. First, initialize the underlying report object in whatever technology
you’re using. Then, pass control to the calling report to make changes specific
to the application. Finally, display the report using your chosen technology.
METHOD zif_bc_alv_report_view~prepare_display_data.
* Step One - Generic - Set up the Basic Report
initialise(
EXPORTING
id_report_name = id_report_name " Calling program
id_variant = id_variant " Layout
io_container = io_container
it_user_commands = it_user_commands " Toolbar Buttons
CHANGING
ct_data_table = ct_data_table ).
* Step Two - Application Specific
application_specific_changes( ).
* Step Three - Generic - Actually Display the Report
display( ).
ENDMETHOD.
Listing 10.2 Preparing and Displaying Data Method
The PREPARE_DISPLAY_DATA method orchestrates th e three mandat ory process
flow steps that are part of creating a report interface. These steps are discussed in
detail in the next section.
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