如何在cl_gui_alv_grid设置list列表

在进行OO Grid编程时，用户常需要使用下拉列表来选择输入，其方法步骤如下：

1、创建内表，在内表增加一下字段
         handle_drdn          type lvc_s_drop-handle,

2、创建GRID
    if cl_gui_alv_grid=>offline( ) is initial.
      create object gr_container_d0100
                    exporting container_name = 'D0100_CONTAINER'.
    endif.

    create object gr_grid_d0100
                  exporting i_parent = gr_container_d0100.

3、设置字段显示格式
 ct_fcat type lvc_t_fcat.
 data: ls_fcat type lvc_s_fcat,
 l_lin   type i.
 clear ls_fcat.
  ls_fcat-tabname   = '1'.
  ls_fcat-fieldname = 'DROPDOWN_F4'.
  ls_fcat-inttype   = 'I'.
  ls_fcat-intlen    = 10.
  ls_fcat-col_pos   = l_lin.
  ls_fcat-scrtext_s = ls_fcat-fieldname.
  ls_fcat-scrtext_m = ls_fcat-fieldname.
  ls_fcat-scrtext_l = ls_fcat-fieldname.
  append ls_fcat to ct_fcat.

4、设置下拉列表数据（本代码是设置'DROPDOWN_F4'为下拉列表）
form d0100_set_grid_drdn changing ct_fcat type lvc_t_fcat.

  field-symbols: <ls_outtab> type g_ty_s_outtab,
                 <ls_fcat>   type lvc_s_fcat.

  data: lt_drdn type lvc_t_drop,                            "#EC NEEDED
        ls_drdn type lvc_s_drop,                            "#EC NEEDED
        lt_dral type lvc_t_dral,                            "#EC NEEDED
        ls_dral type lvc_s_dral,                            "#EC NEEDED
        l_count type i.

  define mac_get_drdn.
    ls_drdn-handle  = 1.  "列表对象句柄
    ls_drdn-value   = &1. "列表显示的值
    append ls_drdn to lt_drdn.

    add 1 to l_count.
    ls_dral-handle    = 1."列表对象句柄
    ls_dral-value     = &1. "列表显示的值
    write l_count to ls_dral-int_value left-justified. " "选择输入的显示的值
    append ls_dral to lt_dral.
  end-of-definition.

  mac_get_drdn 'http://www.aa.com'.
  mac_get_drdn 'http://www.airberlin.com'.
  mac_get_drdn 'http://www.aircanda.ca'.
  mac_get_drdn 'http://www.airfrance.ca'.
  mac_get_drdn 'http://www.alitalia.it'.
  mac_get_drdn 'http://www.british-airways.com'.
  mac_get_drdn 'http://www.continental.com'.
  mac_get_drdn 'http://www.delta-air.com'.
  mac_get_drdn 'http://www.airpacific.com'.
  mac_get_drdn 'http://www.jal.co.jp'.
  mac_get_drdn 'http://www.lufthansa.com'.
  mac_get_drdn 'http://www.laudaair.com'.
  mac_get_drdn 'http://www.nwa.com'.
  mac_get_drdn 'http://www.gantas.com.au'.
  mac_get_drdn 'http://www.saa.co.za.de'.
  mac_get_drdn 'http://www.singaporeair.com'.
  mac_get_drdn 'http://www.swissair.com'.
  mac_get_drdn 'http://www.ual.com'.

  call method gr_grid_d0100->set_drop_down_table
    exporting
      it_drop_down_alias = lt_dral.   "该调用将列出描叙，自动转换为输入ID值

*  call method gr_grid_d0100->set_drop_down_table
*    exporting
*      it_drop_down = lt_drdn.   "该列表选择

    read table ct_fcat assigning <ls_fcat>
               with key fieldname = 'DROPDOWN_F4'.
    if sy-subrc eq 0.
      <ls_fcat>-drdn_field = 'HANDLE_DRDN'.
      <ls_fcat>-edit = 'X'.
      <ls_fcat>-drdn_alias = con_true.
    endif.

    loop at gt_outtab assigning <ls_outtab>.
      <ls_outtab>-handle_drdn = 1."设置字段列表控制句柄，和上面list表对应上
    endloop.

endform.                    " d0100_set_grid_drdn 

5、输出数据
    call method gr_grid_d0100->set_table_for_first_display
      exporting
        i_buffer_active     = gs_test-buffer_active
        i_bypassing_buffer  = gs_test-bypassing_buffer
        i_consistency_check = l_consistency_check
        is_variant          = ls_vari
        i_save              = 'A'
        i_default           = con_true
        is_layout           = ls_layo
        is_print            = ls_prnt
        it_hyperlink        = lt_hype
      changing
        it_outtab           = gt_outtab[]
        it_fieldcatalog     = lt_fcat.

参考sap代码：BCALV_TEST_GRID_EDITABLE