Doubts with already developed code

Question

Hi,
can anyone see the the following code and answer my questions
    call method g_grid->set_table_for_first_display
     exporting
   I_BYPASSING_BUFFER            =
   I_BUFFER_ACTIVE               =
   I_CONSISTENCY_CHECK           =
   I_STRUCTURE_NAME              =
   IS_VARIANT                    =
   I_SAVE                        =
   I_DEFAULT                     = 'X'
         is_layout                     = g_layout
   IS_PRINT                      =
   IT_SPECIAL_GROUPS             =
    it_toolbar_excluding          = pt_exclude
   IT_HYPERLINK                  =
   IT_ALV_GRAPHICS               =
      changing
        it_outtab                     =  itab
        it_fieldcatalog               = fieldcat
   IT_SORT                       =
   IT_FILTER                     =
      exceptions
        invalid_parameter_combination = 1
        program_error                 = 2
        too_many_lines                = 3
        others                        = 4
What 's the purpose of this piece of code
   create object event_receiver.
    set handler event_receiver->handle_user_command for g_grid.
    set handler event_receiver->handle_toolbar for g_grid.
   call method g_grid->set_toolbar_interactive.
  endif.                               "IF grid1 IS INITIAL
  call method cl_gui_control=>set_focus exporting control = g_grid.
1)when the control is here   set handler event_receiver->handle_user_command for g_grid  does it trigger the method
handle_user_command.
2)And similarily when the control is here     set handler event_receiver->handle_toolbar for g_grid does it trigger
  method handle_toolbar.
3) whats the purpose of this    call method g_grid->set_toolbar_interactive.
Thanks

Answer 1

Hi NAVEEN,
Thanks for the reply
I HAVE COUPLE MORE QUESTIONS
QUESTION 1) when the control is here set handler event_receiver->handle_toolbar for g_grid does it trigger method handle_toolbar.
CAN YOU TELL ME WHEN THIS METHOD GETS TRIGGERED
QUESTION2)
tHIS IS MY PIECE OF CODE
method handle_toolbar.
    clear ls_toolbar.
    move 3 to ls_toolbar-butn_type.
    append ls_toolbar to e_object->mt_toolbar.
    clear ls_toolbar.
    move 'TEST' to ls_toolbar-function.
    move 'TEST '(112) to ls_toolbar-text.
    move ' ' to ls_toolbar-disabled.
    append ls_toolbar to e_object->mt_toolbar.
    if flag = 'X'. -
THIS IS IMP
      loop at e_object->mt_toolbar into ls_toolbar.
        if ls_toolbar-function = 'TEST'.
          ls_toolbar-disabled = 'X'.----
THIS IS IMP
          modify e_object->mt_toolbar from ls_toolbar.
        endif.
      endloop.
    endif.
  endmethod.
  method handle_user_command.
    case e_ucomm.
      when 'TEST'.
        call method g_grid->get_selected_rows
                 importing et_index_rows = lt_rows.
        call method cl_gui_cfw=>flush.
        if sy-subrc ne 0.
        else.
          FLAG = 'X'.   " TO DISABLE THE BUTTON TEST  -
THIS IS IMP
  PERFORM CHANGE_OUTPUTTABLE.  "hERE IAM DELETING SOME RECORDS IN OUT PUT TABLE
(HERE I NEED TO DELETE SOME RECORDS AND DISABLE THE BUTTON TEST)
         g_layout-grid_title = 'Check ESOMETHING ELSEs' .
          call method g_grid->refresh_table_display.   
        endif.
    endcase.
  endmethod.       
SO WHEN I CALL         call method g_grid->refresh_table_display.     DOES THE CONTROL AGAIN GOES TO method handle_toolbar.
BECAUSE THATS WHERE THE CODE TO DISABLE THE BUTTON IS RIGHT.
SO WHENI CALL call method g_grid->refresh_table_display. DOES IT AGAIN GOES THRU ALL EVENT HANDLERS AGAIN
let me know
Thanks
Suchitra