Change the layout of the alv

REPORT ZDEMO_ALVGRID_EDIT .

TABLES: ekko.

TYPE-POOLS: slis.

"ALV Declarations
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,
field_style TYPE lvc_t_styl,
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.
DATA: it_fieldcat TYPE lvc_t_fcat,
wa_fieldcat TYPE lvc_s_fcat,
gd_tab_group TYPE slis_t_sp_group_alv,
gd_layout TYPE lvc_s_layo, "slis_layout_alv,
gd_repid LIKE sy-repid.

*Start-of-selection.
START-OF-SELECTION.

PERFORM data_retrieval.

PERFORM set_specific_field_attributes.

PERFORM build_fieldcatalog.

PERFORM build_layout.

PERFORM display_alv_report.
*&---------------------------------------------------------------------
**& Form BUILD_FIELDCATALOG
*&---------------------------------------------------------------------
***Build Fieldcatalog for ALV Report
*----------------------------------------------------------------------
FORM build_fieldcatalog.
wa_fieldcat-fieldname = 'EBELN'.
wa_fieldcat-scrtext_m = 'Purchase Order'.
wa_fieldcat-col_pos = 0.
wa_fieldcat-outputlen = 10.
wa_fieldcat-emphasize = 'X'.
wa_fieldcat-key = 'X'.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'EBELP'.
wa_fieldcat-scrtext_m = 'PO Item'.
wa_fieldcat-col_pos = 1.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'STATU'.
wa_fieldcat-scrtext_m = 'Status'.
wa_fieldcat-col_pos = 2.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'AEDAT'.
wa_fieldcat-scrtext_m = 'Item change date'.
wa_fieldcat-col_pos = 3.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'MATNR'.
wa_fieldcat-scrtext_m = 'Material Number'.
wa_fieldcat-col_pos = 4.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'MENGE'.
wa_fieldcat-scrtext_m = 'PO quantity'.
wa_fieldcat-col_pos = 5.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'MEINS'.
wa_fieldcat-scrtext_m = 'Order Unit'.
wa_fieldcat-col_pos = 6.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'NETPR'.
wa_fieldcat-scrtext_m = 'Net Price'.
wa_fieldcat-edit = 'X'.
"sets whole column to be editable
wa_fieldcat-col_pos = 7.
wa_fieldcat-outputlen = 15.
wa_fieldcat-datatype = 'CURR'.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.

wa_fieldcat-fieldname = 'PEINH'.
wa_fieldcat-scrtext_m = 'Price Unit'.
wa_fieldcat-col_pos = 8.
APPEND wa_fieldcat TO it_fieldcat.
CLEAR wa_fieldcat.
ENDFORM. " BUILD_FIELDCATALOG
*&---------------------------------------------------------------------
**& Form BUILD_LAYOUT
*&---------------------------------------------------------------------
***Build layout for ALV grid report
*----------------------------------------------------------------------
FORM build_layout.
*Set layout field for field attributes(i.e. input/output)
gd_layout-stylefname = 'FIELD_STYLE'.
gd_layout-zebra = 'X'.
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'CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'
EXPORTING
i_callback_program = gd_repid
i_callback_user_command = 'USER_COMMAND'
is_layout_lvc = gd_layout
it_fieldcat_lvc = it_fieldcat
i_save = 'X'
TABLES
t_outtab = it_ekko
EXCEPTIONS
program_error = 1
OTHERS = 2.
IF sy-subrc ne 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 CORRESPONDING FIELDS OF TABLE it_ekko.

ENDFORM. " DATA_RETRIEVAL
*&---------------------------------------------------------------------
**& Form set_specific_field_attributes
*&---------------------------------------------------------------------
*populate FIELD_STYLE table with specific field attributes
*----------------------------------------------------------------------
form set_specific_field_attributes .
DATA ls_stylerow TYPE lvc_s_styl .
DATA lt_styletab TYPE lvc_t_styl .
*The NETPR field/column has been set to editable in the fieldcatalog...
*The following code sets it to be disabled(display only) if 'NETPR'*is gt than 10.

LOOP AT it_ekko INTO wa_ekko.
IF wa_ekko-netpr GT 10.
ls_stylerow-fieldname = 'NETPR' .
ls_stylerow-style = cl_gui_alv_grid=>mc_style_disabled.
APPEND ls_stylerow TO wa_ekko-field_style.
MODIFY it_ekko FROM wa_ekko.
ENDIF.
ENDLOOP.

endform. " set_specific_field_attributes