APAP ALV進階寫法及優化詳解

*資料準備
*常規定義變數，內表結構，工作區，內表，包。。。。
你的程式碼
*系統變數準備
*如layout，fieldcat 等 系統變數
你的程式碼
*選擇螢幕
你的程式碼
*INITIALIZATION
*at SELECTION-SCREEN .
"START-OF-SELECTION
"End-OF-SELECTION .
「子例程及自定義宏

TABLES : MARA .
*資料準備
"定義結構
TYPES : BEGIN OF gw_Data ,
    MATNR TYPE MATNR ,
    MEINS TYPE MEINS ,
    MAKTX TYPE MAKTX ,
  end of gw_Data .
"定義工作區及內表
data : gs_data TYPE gw_Data .
data :gt_data TYPE table of gw_Data .
"alv 資料
*--------------------------------------------------------------------*
*  通用ALV變數
*--------------------------------------------------------------------*
DATA: wa_layout   TYPE lvc_s_layo.
DATA:wa_fieldcat TYPE lvc_s_fcat,
     gt_fieldcat TYPE lvc_t_fcat.
DATA:gs_glay TYPE  lvc_s_glay.
DATA : gv_error TYPE c.
DATA : BS1 TYPE C.

SELECTION-SCREEN BEGIN OF BLOCK BLOCK  WITH FRAME TITLE TEXT-001 .
  PARAMETERS  p_p1  TYPE mara-matnr OBLIGATORY.   "料號
  SELECTION-SCREEN END OF BLOCK BLOCK .

INITIALIZATION  .
%_p_p1_%_app_%-text = '物料號'.  "設定選擇螢幕初始化名稱

at SELECTION-SCREEN .
PERFORM check_auth .  "許可權檢查

START-OF-SELECTION    .
PERFORM get_DAta  .  "獲取資料屬性

End-OF-SELECTION .
PERFORM diaplay_data.   "展示alv

"獲取資料子程式
FORM get_DAta . 
select a~matnr,a~MEINS,b~maktx   
from mara as a inner join makt as b 
on a~matnr = b~MATNR where a~ZMATNR = @p_p1 into table @data(lt_outdata) .
ENDFORM .
*展示alv 子程式 直接複製
FORM diaplay_data . 
PERFORM set_alv_layout.   "樣式設定
PERFORM bulid_fieldcat.   "格式設定
PERFORM call_alv_func.    "alv 函數
ENDFORM.
"樣式設定  直接複製
FORM set_alv_layout .
 CLEAR: wa_layout.
 wa_layout-zebra      = 'X'.      "斑馬線
 wa_layout-cwidth_opt = 'X'.      "自動列寬
ENDFORM.
"格式設定  固定換數
FORM bulid_fieldcat .
 DEFINE add_col.
*    ADD 1 TO pos.
*    lw_fieldcat-col_pos = pos.
    wa_fieldcat-fieldname = &1.
    wa_fieldcat-ref_field = &2.
    wa_fieldcat-ref_table = &3.
    wa_fieldcat-scrtext_l = &4.
    wa_fieldcat-outputlen = &5.
    wa_fieldcat-no_zero = &6.
    wa_fieldcat-edit = &7.
    wa_fieldcat-edit_mask = &8.
    wa_fieldcat-key = &9.
   CASE  wa_fieldcat-fieldname.
      WHEN 'slbox'.
 wa_fieldcat-checkbox = 'X' .
 wa_fieldcat-edit = 'X' .
  wa_fieldcat-edit_mask = 'X'.
      WHEN OTHERS.
ENDCASE .
    APPEND wa_fieldcat TO gt_fieldcat.
  CLEAR : wa_fieldcat.
  END-OF-DEFINITION.
  REFRESH: gt_fieldcat.
  "add_col 'matnr'     space space '物料號'           space space space space space.
  add_col 'MEINS'     space space '單位'           space space space space space.
  add_col 'maktx'     space space '物料名'           space space space space space.
ENDFORM.
"重新整理 固定複製
FORM refresh_alv .
  DATA: lo_grid   TYPE REF TO cl_gui_alv_grid,
        lw_stable TYPE lvc_s_stbl.
  CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR'
    IMPORTING
      e_grid = lo_grid.
  lw_stable-row = 'X'.
  lw_stable-col = 'X'.
  lo_grid->refresh_table_display(
    EXPORTING
      is_stable = lw_stable
    EXCEPTIONS
      finished  = 1
      OTHERS    = 2 ).
ENDFORM.
"固定,只需要傳內表就行
FORM call_alv_func .
  gs_glay-edt_cll_cb = abap_true.     " 選中複選款，立刻觸發data changed 事件
    CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'
    EXPORTING
      i_callback_program       = sy-repid           "回撥程式
      i_callback_pf_status_set = 'SET_PF_STATUS'
      i_callback_user_command  = 'USER_COMMAND'
            i_grid_settings          = gs_glay
      is_layout_lvc            = wa_layout
      it_fieldcat_lvc          = gt_fieldcat        "需要顯示的內表的列
      i_save                   = 'A'
    TABLES
      t_outtab                 =    lt_outdata      "需要顯示的資料
    EXCEPTIONS
      program_error            = 1
      OTHERS                   = 2.
  IF sy-subrc <> 0.
  ENDIF.
ENDFORM.
"staus  工具列 直接複製
FORM set_pf_status USING rt_extab TYPE slis_t_extab.
  DATA : lw_tab LIKE LINE OF rt_extab.
  REFRESH rt_extab.
 SET PF-STATUS 'STD' EXCLUDING rt_extab.
ENDFORM.
"使用者事件 ,這裡沒寫. 但是如果設定函數雙擊會apap dump 
FORM user_command  USING r_ucomm LIKE sy-ucomm
                         rs_selfield TYPE slis_selfield.
  CASE r_ucomm.
*   匯入
    WHEN '&IMPLE'.
  ENDCASE.
ENDFORM.
"許可權檢查,按照不同的情況呼叫不同的函數,這裡需要更換.
*&---------------------------------------------------------------------*
*& Form check_auth
*&---------------------------------------------------------------------*
*& text
*&---------------------------------------------------------------------*
*& -->  p1        text
*& <--  p2        text
*&---------------------------------------------------------------------*
FORM check_auth .
"select  SINGLE WERKS, KUNNR  into  @data(ls_t001w) from  t001w  WHERE WERKS  = @p_p1  .
 AUTHORITY-CHECK OBJECT 'M_MSEG_WMB'
  ID 'ACTVT'  DUMMY
  ID 'WERKS' FIELD p_p1 .
IF sy-subrc <> 0.
* Implement a suitable exception handling here
ENDIF.
ENDFORM.