REPORT z_demo_alv_refresh_button_3.
*>*********************************************************************
* This report reads and displays data from table MARA.                *
* Each time, the refresh button is pressed, the next 25 records are   *
* read and displayed.                                                 *
*---------------------------------------------------------------------*
* Author : Michel PIOUD                                               *
* Email : mpioud@yahoo.fr  HomePage : http://www.geocities.com/mpioud *
*>*********************************************************************

SELECTION-SCREEN : BEGIN OF LINE,COMMENT 10(20) v_1 FOR FIELD p_max.
PARAMETERS p_max(2) TYPE n DEFAULT '25' OBLIGATORY.
SELECTION-SCREEN END OF LINE.

TYPE-POOLS: slis.                      " ALV Global types

CONSTANTS :
  gc_refresh TYPE syucomm VALUE '&REFRESH'.

DATA:
  BEGIN OF gt_mara OCCURS 0,
    matnr LIKE mara-matnr,             " Material number
    ernam LIKE mara-ernam,             " Name of Person who Created
    ersda LIKE mara-ersda,             " Creation date
    brgew LIKE mara-brgew,             " Gross weight
  END OF gt_mara.

*---------------------------------------------------------------------*
INITIALIZATION.

  v_1 = 'Lines per page'.

*---------------------------------------------------------------------*
START-OF-SELECTION.

  PERFORM f_read_data.

  PERFORM f_display_data.

*---------------------------------------------------------------------*
*       Form  f_read_data
*---------------------------------------------------------------------*
FORM f_read_data.

  STATICS l_mara TYPE matnr.           " Last Material number

  DATA lt_mara LIKE gt_mara OCCURS 0 WITH HEADER LINE.

* Read next 25 records
  SELECT mandt matnr ernam ersda brgew
    INTO CORRESPONDING FIELDS OF TABLE lt_mara
    FROM mara
      UP TO p_max ROWS
   WHERE matnr GT l_mara
   ORDER BY PRIMARY KEY.                                  "#EC PORTABLE

  IF sy-subrc EQ 0.
    MESSAGE s208(00) WITH 'Reading data ...'.
    DESCRIBE TABLE gt_mara.
    READ TABLE lt_mara INDEX sy-tfill.
*   Save last Material number
    l_mara = lt_mara-matnr.
    gt_mara[] = lt_mara[].
  ELSE.
    MESSAGE i208(00) WITH 'Nothing to read ... '.
  ENDIF.

ENDFORM.                               " F_READ_DATA
*---------------------------------------------------------------------*
*      Form  f_display_data
*---------------------------------------------------------------------*
FORM f_display_data.

* Macro definition
  DEFINE m_fieldcat.
    add 1 to ls_fieldcat-col_pos.
    ls_fieldcat-fieldname = &1.
    ls_fieldcat-ref_tabname = 'MARA'.
    append ls_fieldcat to lt_fieldcat.
  END-OF-DEFINITION.

  DEFINE m_sort.
    add 1 to ls_sort-spos.
    ls_sort-fieldname = &1.
    ls_sort-up        = 'X'.
    append ls_sort to lt_sort.
  END-OF-DEFINITION.

  DATA :
    ls_fieldcat   TYPE slis_fieldcat_alv,
    lt_fieldcat   TYPE slis_t_fieldcat_alv,
    lt_sort       TYPE slis_t_sortinfo_alv,
    ls_sort       TYPE slis_sortinfo_alv,
    lt_event_exit TYPE slis_t_event_exit,
    ls_event_exit TYPE slis_event_exit.

* Build Sort table
  m_sort 'MATNR'.

* Build Field Catalog
  m_fieldcat 'MATNR'.
  m_fieldcat 'ERNAM'.
  m_fieldcat 'ERSDA'.
  m_fieldcat 'BRGEW'.

  CLEAR ls_event_exit.
  ls_event_exit-ucomm = gc_refresh.    " Refresh
  ls_event_exit-after = 'X'.
  APPEND ls_event_exit TO lt_event_exit.

  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
       EXPORTING
            i_callback_program       = sy-cprog
            i_callback_pf_status_set = 'PF_STATUS_SET'
            i_callback_user_command  = 'USER_COMMAND'
            it_fieldcat              = lt_fieldcat
            it_sort                  = lt_sort
            it_event_exit            = lt_event_exit
       TABLES
            t_outtab                 = gt_mara.

ENDFORM.                               " F_DISPLAY_DATA
*---------------------------------------------------------------------*
*       FORM USER_COMMAND                                             *
*---------------------------------------------------------------------*
FORM user_command USING u_ucomm     LIKE sy-ucomm
                        us_selfield TYPE slis_selfield.     "#EC CALLED

  CASE u_ucomm.
    WHEN gc_refresh.
      PERFORM f_read_data.             " Refresh data
      us_selfield-refresh    = 'X'.
      us_selfield-col_stable = 'X' .
      us_selfield-row_stable = 'X' .
  ENDCASE.

ENDFORM.                               " USER_COMMAND
*---------------------------------------------------------------------*
*       FORM PF_STATUS_SET                                            *
*---------------------------------------------------------------------*
FORM pf_status_set USING ut_extab TYPE slis_t_extab.        "#EC CALLED

  DELETE ut_extab WHERE fcode = gc_refresh.

  SET PF-STATUS 'STANDARD_FULLSCREEN' OF PROGRAM 'SAPLKKBL'
      EXCLUDING ut_extab.

ENDFORM.                               " PF_STATUS_SET
******** END OF PROGRAM Z_DEMO_ALV_REFRESH_BUTTON_3 *******************