ABAP_to_the_Future

10
ALV SALV Reporting Framework
to make changes one by one. Using an interactive ALV grid is almost as easy as
(gasp) a spreadsheet!
Here, SAP is very clear: with CL_SALV_TABLE, you cannot have an editable grid. It
is impossible. It cannot be done. From a purely technical point of view, this
seems really strange, because at the heart of CL_SALV_TABLE there’s an embedded
instance of CL_GUI_ALV_GRID, which of course can be editable. The problem (for
us programmers) is that the business will come to you with a request for a readonly
report, you’ll program it using the SALV reporting framework (as SAP recommends),
and right at the end—just be fore you think the project is over—the
business will say, “Oh, and can we make a few columns editable?”
SAP’s official position is that you should always use CL_GUI_ALV_GRID, not the
SALV framework, for this purpose. But here’s a little secret: you can make the
SALV object editable.
In order to do so, you have to go through the following steps:
1. You need to create custom class ZCL_SALV_MODEL, inheriting from the standard
SAP class but able to export the underl ying grid object from a linked SALV
report object.
2. Next, the INITIALIZE method of ZCL_BC_VIEW_SALV_TABLE is changed to link
together the instance of the SALV report object and the custom ZCL_SALV_MODEL
class.
3. Then, you code a method in the ZCL_SALV_MODEL to extract the underlying grid
object from the linked SALV report object.
4. Next, you can change the calling program to invoke the report using a method
that automatically creates a container; you want to prog rammatically change
the user commands to add an edit_me command.
5. Finally, you bring all this together and code some user command handling such
that when a user clicks a Make This Editable button, he can in fact edit the
data.
10.4.1 Creating a Custom Class to Hold the Standard SALV Model
Class
In order to make a SALV object editable, you need to be able to access the underlying
CL_GUI_ALV_GRID instance. Where that grid object normally lives is in standard
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