有些操作会更新ALV的某个字段值，例如消息字段，此时会希望ALV的消息字段会根据内容自动调整列宽：
FORM frm_user_command USING r_ucomm TYPE sy-ucomm
rs_selfield TYPE slis_selfield.
DATA: lr_grid TYPE REF TO cl_gui_alv_grid,
ls_layout TYPE lvc_s_layo.
CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR'
IMPORTING
e_grid = lr_grid.
CASE r_ucomm.
WHEN 'ZCANCEL'.
PERFORM frm_cancel.
WHEN 'ZSAVE'.
PERFORM frm_save.
ENDCASE.
CALL METHOD lr_grid->get_frontend_layout
IMPORTING
es_layout = ls_layout.
ls_layout-cwidth_opt = 'X'. "最优宽
CALL METHOD lr_grid->set_frontend_layout
EXPORTING
is_layout = ls_layout.
CALL METHOD lr_grid->check_changed_data.
rs_selfield-refresh = 'X' .
ENDFORM. "FRM_USER_COMMAND
