Enhanced ALV grid display

*&-------------------------------------------------------------*
*& Report  ZDEMO_ALVGRID                                       *
*&                                                             *
*&-------------------------------------------------------------*
*&                                                             *
*& Example of a simple ALV Grid Report                         *
*& ...................................                         *
*&                                                             *
*& The basic requirement for this demo is to display a number  *
*& of fields from the EKKO table.                              *
*&-------------------------------------------------------------*
REPORT  zdemo_alvgrid                 .
TABLES:     ekko.
type-pools: slis.                                 "ALV Declarations
*Data Declaration
*----------------
TYPES: BEGIN OF t_ekko,
  ebeln TYPE ekpo-ebeln,
  ebelp TYPE ekpo-ebelp,
  statu TYPE ekpo-statu,
  aedat TYPE ekpo-aedat,
  matnr TYPE ekpo-matnr,
  menge TYPE ekpo-menge,
  meins TYPE ekpo-meins,
  netpr TYPE ekpo-netpr,
  peinh TYPE ekpo-peinh,
 END OF t_ekko.
DATA: it_ekko TYPE STANDARD TABLE OF t_ekko INITIAL SIZE 0,
      wa_ekko TYPE t_ekko.

*ALV data declarations
data: fieldcatalog type slis_t_fieldcat_alv with header line,
      gd_tab_group type slis_t_sp_group_alv,
      gd_layout    type slis_layout_alv,
      gd_repid     like sy-repid,
      gt_events     type slis_t_event,
      gd_prntparams type slis_print_alv.

************************************************************************
*Start-of-selection.
START-OF-SELECTION.
perform data_retrieval.
perform build_fieldcatalog.
perform build_layout.
perform build_events.
perform build_print_params.
perform display_alv_report.

*&---------------------------------------------------------------------*
*&      Form  BUILD_FIELDCATALOG
*&---------------------------------------------------------------------*
*       Build Fieldcatalog for ALV Report
*----------------------------------------------------------------------*
form build_fieldcatalog.

* There are a number of ways to create a fieldcat.
* For the purpose of this example i will build the fieldcatalog manualy
* by populating the internal table fields individually and then
* appending the rows. This method can be the most time consuming but can
* also allow you  more control of the final product.
* Beware though, you need to ensure that all fields required are
* populated. When using some of functionality available via ALV, such as
* total. You may need to provide more information than if you were
* simply displaying the result
*               I.e. Field type may be required in-order for
*                    the 'TOTAL' function to work.
  fieldcatalog-fieldname   = 'EBELN'.
  fieldcatalog-seltext_m   = 'Purchase Order'.
  fieldcatalog-col_pos     = 0.
  fieldcatalog-outputlen   = 10.
  fieldcatalog-emphasize   = 'X'.
  fieldcatalog-key         = 'X'.
*  fieldcatalog-do_sum      = 'X'.
*  fieldcatalog-no_zero     = 'X'.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'EBELP'.
  fieldcatalog-seltext_m   = 'PO Item'.
  fieldcatalog-col_pos     = 1.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'STATU'.
  fieldcatalog-seltext_m   = 'Status'.
  fieldcatalog-col_pos     = 2.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'AEDAT'.
  fieldcatalog-seltext_m   = 'Item change date'.
  fieldcatalog-col_pos     = 3.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'MATNR'.
  fieldcatalog-seltext_m   = 'Material Number'.
  fieldcatalog-col_pos     = 4.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'MENGE'.
  fieldcatalog-seltext_m   = 'PO quantity'.
  fieldcatalog-col_pos     = 5.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'MEINS'.
  fieldcatalog-seltext_m   = 'Order Unit'.
  fieldcatalog-col_pos     = 6.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'NETPR'.
  fieldcatalog-seltext_m   = 'Net Price'.
  fieldcatalog-col_pos     = 7.
  fieldcatalog-outputlen   = 15.
  fieldcatalog-do_sum      = 'X'.
  fieldcatalog-datatype     = 'CURR'.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'PEINH'.
  fieldcatalog-seltext_m   = 'Price Unit'.
  fieldcatalog-col_pos     = 8.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
endform.                    " BUILD_FIELDCATALOG

*&---------------------------------------------------------------------*
*&      Form  BUILD_LAYOUT
*&---------------------------------------------------------------------*
*       Build layout for ALV grid report
*----------------------------------------------------------------------*
form build_layout.
  gd_layout-no_input          = 'X'.
  gd_layout-colwidth_optimize = 'X'.
  gd_layout-totals_text       = 'Totals'(201).
*  gd_layout-totals_only        = 'X'.
*  gd_layout-f2code            = 'DISP'.  "Sets fcode for when double
*                                         "click(press f2)
*  gd_layout-zebra             = 'X'.
*  gd_layout-group_change_edit = 'X'.
*  gd_layout-header_text       = 'helllllo'.
endform.                    " BUILD_LAYOUT

*&---------------------------------------------------------------------*
*&      Form  DISPLAY_ALV_REPORT
*&---------------------------------------------------------------------*
*       Display report using ALV grid
*----------------------------------------------------------------------*
form display_alv_report.
  gd_repid = sy-repid.
  call function 'REUSE_ALV_GRID_DISPLAY'
       exporting
            i_callback_program      = gd_repid
            i_callback_top_of_page   = 'TOP-OF-PAGE'  "see FORM
            i_callback_user_command = 'USER_COMMAND'
*            i_grid_title           = outtext
            is_layout               = gd_layout
            it_fieldcat             = fieldcatalog[]
*            it_special_groups       = gd_tabgroup
            it_events               = gt_events
            is_print                = gd_prntparams
            i_save                  = 'X'
*            is_variant              = z_template
       tables
            t_outtab                = it_ekko
       exceptions
            program_error           = 1
            others                  = 2.
  if sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  endif.
endform.                    " DISPLAY_ALV_REPORT

*&---------------------------------------------------------------------*
*&      Form  DATA_RETRIEVAL
*&---------------------------------------------------------------------*
*       Retrieve data form EKPO table and populate itab it_ekko
*----------------------------------------------------------------------*
form data_retrieval.
select ebeln ebelp statu aedat matnr menge meins netpr peinh
 up to 10 rows
  from ekpo
  into table it_ekko.
endform.                    " DATA_RETRIEVAL
*-------------------------------------------------------------------*
* Form  TOP-OF-PAGE                                                 *
*-------------------------------------------------------------------*
* ALV Report Header                                                 *
*-------------------------------------------------------------------*
Form top-of-page.
*ALV Header declarations
data: t_header type slis_t_listheader,
      wa_header type slis_listheader,
      t_line like wa_header-info,
      ld_lines type i,
      ld_linesc(10) type c.
* Title
  wa_header-typ  = 'H'.
  wa_header-info = 'EKKO Table Report'.
  append wa_header to t_header.
  clear wa_header.
* Date
  wa_header-typ  = 'S'.
  wa_header-key = 'Date: '.
  CONCATENATE  sy-datum+6(2) '.'
               sy-datum+4(2) '.'
               sy-datum(4) INTO wa_header-info.   "todays date
  append wa_header to t_header.
  clear: wa_header.
* Total No. of Records Selected
  describe table it_ekko lines ld_lines.
  ld_linesc = ld_lines.
  concatenate 'Total No. of Records Selected: ' ld_linesc
                    into t_line separated by space.
  wa_header-typ  = 'A'.
  wa_header-info = t_line.
  append wa_header to t_header.
  clear: wa_header, t_line.
  call function 'REUSE_ALV_COMMENTARY_WRITE'
       exporting
            it_list_commentary = t_header.
*            i_logo             = 'Z_LOGO'.
endform.
*------------------------------------------------------------------*
*       FORM USER_COMMAND                                          *
*------------------------------------------------------------------*
*       --> R_UCOMM                                                *
*       --> RS_SELFIELD                                            *
*------------------------------------------------------------------*
FORM user_command USING r_ucomm LIKE sy-ucomm
                  rs_selfield TYPE slis_selfield.
* Check function code
  CASE r_ucomm.
    WHEN '&IC1'.
*   Check field clicked on within ALVgrid report
    IF rs_selfield-fieldname = 'EBELN'.
*     Read data table, using index of row user clicked on
      READ TABLE it_ekko INTO wa_ekko INDEX rs_selfield-tabindex.
*     Set parameter ID for transaction screen field
      SET PARAMETER ID 'BES' FIELD wa_ekko-ebeln.
*     Sxecute transaction ME23N, and skip initial data entry screen
      CALL TRANSACTION 'ME23N' AND SKIP FIRST SCREEN.
    ENDIF.
  ENDCASE.
ENDFORM.
*&---------------------------------------------------------------------*
*&      Form  BUILD_EVENTS
*&---------------------------------------------------------------------*
*       Build events table
*----------------------------------------------------------------------*
form build_events.
  data: ls_event type slis_alv_event.
  call function 'REUSE_ALV_EVENTS_GET'
       exporting
            i_list_type = 0
       importing
            et_events   = gt_events[].
  read table gt_events with key name =  slis_ev_end_of_page
                           into ls_event.
  if sy-subrc = 0.
    move 'END_OF_PAGE' to ls_event-form.
    append ls_event to gt_events.
  endif.
    read table gt_events with key name =  slis_ev_end_of_list
                           into ls_event.
  if sy-subrc = 0.
    move 'END_OF_LIST' to ls_event-form.
    append ls_event to gt_events.
  endif.
endform.                    " BUILD_EVENTS
*&---------------------------------------------------------------------*
*&      Form  BUILD_PRINT_PARAMS
*&---------------------------------------------------------------------*
*       Setup print parameters
*----------------------------------------------------------------------*
form build_print_params.
  gd_prntparams-reserve_lines = '3'.   "Lines reserved for footer
  gd_prntparams-no_coverpage = 'X'.
endform.                    " BUILD_PRINT_PARAMS
*&---------------------------------------------------------------------*
*&      Form  END_OF_PAGE
*&---------------------------------------------------------------------*
form END_OF_PAGE.
  data: listwidth type i,
        ld_pagepos(10) type c,
        ld_page(10)    type c.
  write: sy-uline(50).
  skip.
  write:/40 'Page:', sy-pagno .
endform.
*&---------------------------------------------------------------------*
*&      Form  END_OF_LIST
*&---------------------------------------------------------------------*
form END_OF_LIST.
  data: listwidth type i,
        ld_pagepos(10) type c,
        ld_page(10)    type c.
  skip.
  write:/40 'Page:', sy-pagno .
endform.