Do not allow to sort some columns in Alv Grid

Question

Dear friends,
Please help me.
I want to tell to the method set_table_for_first_display - make one of the columns not sortable.  Let's say the column name is "My Icon".
What I mean with that is:
when User will highlight column "My icon" and then click on sort buttons in the toolbar - no sort will happen on this column.
I was trying to identify a field in lvc_s_sort which would say "do not sort this column".  Is there any?
Or the only way to accomplish my task is to make sort buttons in the toolbar disable if column "My Icon" is clicked?
gt_sort      TYPE lvc_t_sort.
    CALL  METHOD grid1->set_table_for_first_display
         EXPORTING i_structure_name = 'IT'
                   is_layout        = gs_layout
                   is_print         = gs_print
         CHANGING  it_outtab        = it
                   it_fieldcatalog  = gt_fcat
                   it_sort = gt_sort
Thank you,
Tatyana.

Answer 1

Got a solution for ya, but you have to handle it thru coding.   So you will need to handle an event from your ALV grid. 
First thing is that you need a local class as your event handler,  copy and paste this code.  Here we are using the name ALV_GRID for your alv object
data: alv_grid       type ref to cl_gui_alv_grid.
*       CLASS lcl_event_receiver DEFINITION
class lcl_event_receiver definition.
  public section.
    methods handle_user_command
      for event before_user_command of cl_gui_alv_grid
      importing e_ucomm.
  private section.
endclass.
*       CLASS lCL_EVENT_RECEIVER IMPLEMENTATION
class lcl_event_receiver implementation.
  method handle_user_command.
    data: icols type lvc_t_col,
          xcols like line of icols.
* Get the currently selected column
    call method alv_grid->get_selected_columns
       importing
         et_index_columns = icols.
    read table icols into xcols index 1.
* If the selected column is not one that should be sorted
    check xcols-fieldname = 'MATNR'.    "<-- Whatever columns that you don't want to allow sorting on.
* Now check the function code, if sort ascending or descending, then give message
    check e_ucomm = cl_gui_alv_grid=>mc_fc_sort_asc
      or  e_ucomm =  cl_gui_alv_grid=>mc_fc_sort_dsc.
    message i001(00) with 'Can not sort on this column'.
* Now set the UCOMM as if the user didn't click anything.
    call method alv_grid->set_user_command( space ).
  endmethod.
endclass.
data: event_receiver type ref to lcl_event_receiver.
Also, you will need to set the event hanlder after calling the SET_TABLE_FOR_FIRST_DISPLAY.
  call method alv_grid->set_table_for_first_display
      changing
           it_outtab       = i_alv[]
           it_fieldcatalog = ifc[].
*  Set the handler for ALV grid
  create object event_receiver.
  set handler event_receiver->handle_user_command for alv_grid.
Just tested this, and works quite well.
Regards,
Rich Heilman