ABAP - ENHACEMENT - F4_HELP_EXIT

最新推荐文章于 2023-03-08 17:05:56 发布

原创最新推荐文章于 2023-03-08 17:05:56 发布 · 629 阅读

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本文介绍了一个 ABAP 程序中 F4 帮助的实现方式，包括不同步骤的处理逻辑，如 SELONE、PRESEL 和 SELECT 等，以及如何根据 CALLCONTROL 参数来定制搜索帮助的行为。

FUNCTION zdemo_help.
*"----------------------------------------------------------------------
*"*"Local interface:
*"  TABLES
*"      SHLP_TAB TYPE  SHLP_DESCR_TAB_T
*"      RECORD_TAB STRUCTURE  SEAHLPRES
*"  CHANGING
*"     VALUE(SHLP) TYPE  SHLP_DESCR_T
*"     VALUE(CALLCONTROL) LIKE  DDSHF4CTRL STRUCTURE  DDSHF4CTRL
*"----------------------------------------------------------------------
  DATA:  wa_ship  TYPE shlp_descr_t,
         wa_if    TYPE LINE OF shlp_descr_t-interface,
         wa_tab   TYPE seahlpres,
         wa_skat  TYPE skat.

    PERFORM get_f4data.

  IF  callcontrol-step = 'DISP'.
    REFRESH:record_tab.

    LOOP AT it_f4data.
      wa_skat-saknr = it_f4data-.
      wa_skat-txt50 = it_f4data-.
      wa_tab-string = wa_skat.
      APPEND wa_tab TO record_tab.
    ENDLOOP.
    REFRESH:it_f4data.

ENDIF.

ENDFUNCTION.

*

Standard method

FUNCTION F4IF_SHLP_EXIT_EXAMPLE.
*"----------------------------------------------------------------------
*"*"Lokale Schnittstelle:
*"  TABLES
*"      SHLP_TAB TYPE  SHLP_DESCT
*"      RECORD_TAB STRUCTURE  SEAHLPRES
*"  CHANGING
*"     VALUE(SHLP) TYPE  SHLP_DESCR
*"     VALUE(CALLCONTROL) LIKE  DDSHF4CTRL STRUCTURE  DDSHF4CTRL
*"----------------------------------------------------------------------

* EXIT immediately, if you do not want to handle this step
  IF CALLCONTROL-STEP <> 'SELONE' AND
     CALLCONTROL-STEP <> 'SELECT' AND
     " AND SO ON
     CALLCONTROL-STEP <> 'DISP'.
     EXIT.
  ENDIF.

*"----------------------------------------------------------------------
* STEP SELONE  (Select one of the elementary searchhelps)
*"----------------------------------------------------------------------
* This step is only called for collective searchhelps. It may be used
* to reduce the amount of elementary searchhelps given in SHLP_TAB.
* The compound searchhelp is given in SHLP.
* If you do not change CALLCONTROL-STEP, the next step is the
* dialog, to select one of the elementary searchhelps.
* If you want to skip this dialog, you have to return the selected
* elementary searchhelp in SHLP and to change CALLCONTROL-STEP to
* either to 'PRESEL' or to 'SELECT'.
  IF CALLCONTROL-STEP = 'SELONE'.
*   PERFORM SELONE .........
    EXIT.
  ENDIF.

*"----------------------------------------------------------------------
* STEP PRESEL  (Enter selection conditions)
*"----------------------------------------------------------------------
* This step allows you, to influence the selection conditions either
* before they are displayed or in order to skip the dialog completely.
* If you want to skip the dialog, you should change CALLCONTROL-STEP
* to 'SELECT'.
* Normaly only SHLP-SELOPT should be changed in this step.
  IF CALLCONTROL-STEP = 'PRESEL'.
*   PERFORM PRESEL ..........
    EXIT.
  ENDIF.
*"----------------------------------------------------------------------
* STEP SELECT    (Select values)
*"----------------------------------------------------------------------
* This step may be used to overtake the data selection completely.
* To skip the standard seletion, you should return 'DISP' as following
* step in CALLCONTROL-STEP.
* Normally RECORD_TAB should be filled after this step.
* Standard function module F4UT_RESULTS_MAP may be very helpfull in this
* step.
  IF CALLCONTROL-STEP = 'SELECT'.
*   PERFORM STEP_SELECT TABLES RECORD_TAB SHLP_TAB
*                       CHANGING SHLP CALLCONTROL RC.
*   IF RC = 0.
*     CALLCONTROL-STEP = 'DISP'.
*   ELSE.
*     CALLCONTROL-STEP = 'EXIT'.
*   ENDIF.
    EXIT. "Don't process STEP DISP additionally in this call.
  ENDIF.
*"----------------------------------------------------------------------
* STEP DISP     (Display values)
*"----------------------------------------------------------------------
* This step is called, before the selected data is displayed.
* You can e.g. modify or reduce the data in RECORD_TAB
* according to the users authority.
* If you want to get the standard display dialog afterwards, you
* should not change CALLCONTROL-STEP.
* If you want to overtake the dialog on you own, you must return
* the following values in CALLCONTROL-STEP:
* - "RETURN" if one line was selected. The selected line must be
*   the only record left in RECORD_TAB. The corresponding fields of
*   this line are entered into the screen.
* - "EXIT" if the values request should be aborted
* - "PRESEL" if you want to return to the selection dialog
* Standard function modules F4UT_PARAMETER_VALUE_GET and
* F4UT_PARAMETER_RESULTS_PUT may be very helpfull in this step.
  IF CALLCONTROL-STEP = 'DISP'.
*   PERFORM AUTHORITY_CHECK TABLES RECORD_TAB SHLP_TAB
*                           CHANGING SHLP CALLCONTROL.
    EXIT.
  ENDIF.
ENDFUNCTION.