ABAP_to_the_Future

10
ALV SALV Reporting Framework
3. Change the INITIALIZE method to pass in the container object to the SALV factory
class.
4. Code the method that adds a list of user commands received from the calling
program to the SALV report object.
5. Pass in the list of user commands from the calling program.
This process of creating a screen automa tically is going to seem quite complicated;
it involves calling a method, whic h calls a function module, which calls
another method; it’s enough to make your head spin. Nonetheless, this only has
to be set up once, and all of this complexity is hidden from the calling program
forevermore.
If you want the screen and associated co ntainer to magically create themselves,
then first you split the initialization into two steps: creating such a screen (Section
10.3.1) and then the rest of the initialization steps you normally have to do manually
in each report (Section 10.3.2 and Section 10.3.3). Then, once the screen
and container are in place, you move on to looking at how the SALV-specific view
class goes about programmatically adding new custom commands to the toolbar
(Section 10.3.4) and how the calling pr ogram tells the view what custom commands
it wants the view to display (Section 10.3.5).
10.3.1 Creating a Method to Automatically Create a Container
In order to automatically create a contai ner, you have to create a method called
CREATE_CONTAINER_PREP_DISPLAY and add it to the concrete ZCL_BC_VIEW_SALV_
TABLE class, which is going to be invoked from the calling program instead of the
usual INITIALIZE method.
The first half of Listing 10.23 puts the in put parameters into global (to the class
instance) variables, and then a function module is called, the purpose of which
revolves around creating a screen and container. The call needs to be to a function
module, because function modules can call screens, but methods cannot.
METHOD create_container_prep_display.
md_report_name = id_report_name.
ms_variant-report = id_report_name.
ms_variant-variant = id_variant.
mt_user_commands[] = it_user_commands[].
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