在這一篇中將學習一下ALV Tree的使用方法。通過名字可以看出，ALV TREE應該是將ALV與TREE這兩者進行組合。

????? ALV Tree實現原理：創建一個 cl_gui_alv_tree對象，定義一個 treev_hhdr類型的數據，主要用來顯示tree的Header信息。調用ALVtree的? SET_TABLE_FOR_FIRST_DISPLAY方法，調用ALV tree的 ADD_NODE方法逐行添加數據。在這里不進行詳細描述，直接看代碼吧。

? *&---------------------------------------------------------------------*
*&?Report??ZTEST_TREE
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT??ZTEST_TREE.

DATA:?g_alv_tree???????????TYPE?REF?TO?cl_gui_alv_tree,
??????g_customer_container?TYPE?REF?TO?cl_gui_custom_container.

DATA:?gt_sflight??????type?sflight?occurs?0,
??????ok_code?like?sy-ucomm,
??????save_ok?like?sy-ucomm.

start-of-SELECTION.
??set?SCREEN?100.
*&---------------------------------------------------------------------*
*&??????Module??STATUS_0100??OUTPUT
*&---------------------------------------------------------------------*
*???????text
*----------------------------------------------------------------------*
MODULE?STATUS_0100?OUTPUT.
??SET?PF-STATUS?'MAIN0100'.
*??SET?TITLEBAR?'xxx'.
??IF?g_alv_tree?is?INITIAL.
????PERFORM?init_tree.
??ENDIF.
??call?method?cl_gui_cfw=>flush.
ENDMODULE.?????????????????"?STATUS_0100??OUTPUT
*&---------------------------------------------------------------------*
*&??????Module??USER_COMMAND_0100??INPUT
*&---------------------------------------------------------------------*
*???????text
*----------------------------------------------------------------------*
MODULE?USER_COMMAND_0100?INPUT.
??save_ok?=?ok_code?.
??CLEAR?ok_code.
??CASE?save_ok?.
????WHEN?'EXIT'.
??????CALL?METHOD?g_alv_tree->FREE.
??????leave?program.
??ENDCASE.
ENDMODULE.?????????????????"?USER_COMMAND_0100??INPUT
*&---------------------------------------------------------------------*
*&??????Form??init_tree
*&---------------------------------------------------------------------*
*???????text
*----------------------------------------------------------------------*
*??-->??p1????????text
*??<--??p2????????text
*----------------------------------------------------------------------*
FORM?init_tree?.
??CREATE?OBJECT?g_customer_container
????EXPORTING
??????CONTAINER_NAME?????=?'CUS_CON'
??????.

??CREATE?OBJECT?g_alv_tree
????EXPORTING
??????PARENT??????????????????????=?g_customer_container
??????NODE_SELECTION_MODE?????????=?CL_GUI_COLUMN_TREE=>node_sel_mode_single
??????ITEM_SELECTION??????????????=?'X'
??????NO_HTML_HEADER??????????????=?'X'
??????.

??DATA:?g_tree_header?type?treev_hhdr.
??g_tree_header-HEADING?=?'Month/Carrier/Date'.
??g_tree_header-TOOLTIP?=?'Flights?in?a?month'.
??g_tree_header-width???=?30.

??CALL?METHOD?g_alv_tree->SET_TABLE_FOR_FIRST_DISPLAY
????EXPORTING
??????I_STRUCTURE_NAME????=?'SFLIGHT'
??????IS_HIERARCHY_HEADER?=?g_tree_header
????CHANGING
??????IT_OUTTAB???????????=?gt_sflight.

??perform?create_hierarchy.
??CALL?METHOD?g_alv_tree->FRONTEND_UPDATE.

ENDFORM.????????????????????"?init_tree
*&---------------------------------------------------------------------*
*&??????Form??create_hierarchy
*&---------------------------------------------------------------------*
*???????text
*----------------------------------------------------------------------*
*??-->??p1????????text
*??<--??p2????????text
*----------------------------------------------------------------------*
FORM?create_hierarchy?.
??DATA:?ls_sflight?type?sflight,
????????lt_sflight?type?sflight?occurs?0,
????????t_yyyymm(6)?TYPE?C,
????????t_carrid?LIKE?sflight-carrid,
????????t_yyyymm_last(6)?TYPE?C,
????????t_carrid_last?LIKE?sflight-carrid.

??DATA:?K_month?type?lvc_nkey,
????????K_carrid?type?lvc_nkey,
????????K_last?TYPE?lvc_nkey.

??select?*?from?sflight?into?table?lt_sflight?up?to?150?rows.
??SORT?lt_sflight?by?fldate+0(6)?carrid?fldate+6(2).

??LOOP?AT?lt_sflight?INTO?ls_sflight.
????t_yyyymm?=?ls_sflight-fldate+0(6).
????t_carrid?=?ls_sflight-carrid.

????IF?t_yyyymm?<>?t_yyyymm_last.
??????t_yyyymm_last?=?t_yyyymm.
??????PERFORM?AddMonth?USING?t_yyyymm
???????????????????????CHANGING?K_month?.
??????CLEAR?t_carrid_last.
????ENDIF.

????IF?t_carrid?<>?t_carrid_last.
??????t_carrid_last?=?t_carrid.
??????PERFORM?AddCarrid?USING?t_carrid?K_month
????????????????????????CHANGING?K_carrid.
????ENDIF.

????PERFORM?AddLine?USING?ls_sflight?K_carrid
????????????????????CHANGING?K_last.
??ENDLOOP.
ENDFORM.????????????????????"?create_hierarchy
*&---------------------------------------------------------------------*
*&??????Form??AddMonth
*&---------------------------------------------------------------------*
*???????text
*----------------------------------------------------------------------*
*??????-->P_T_YYYYMM??text
*??????<--P_K_MONTH??text
*----------------------------------------------------------------------*
FORM?AddMonth??USING????P_T_YYYYMM?TYPE?C
???????????????CHANGING?P_K_MONTH?TYPE?lvc_nkey.
??DATA:?g_sflight?TYPE?sflight,
????????l_node_text?type?lvc_value.
??l_node_text?=?P_T_YYYYMM.
??CALL?METHOD?g_alv_tree->ADD_NODE
????EXPORTING
??????I_RELAT_NODE_KEY?????=?''
??????I_RELATIONSHIP???????=?cl_gui_column_tree=>relat_last_child
??????IS_OUTTAB_LINE???????=?g_sflight
*??????IS_NODE_LAYOUT???????=
*??????IT_ITEM_LAYOUT???????=
??????I_NODE_TEXT??????????=?l_node_text
????IMPORTING
??????E_NEW_NODE_KEY???????=?P_K_MONTH
*????EXCEPTIONS
*??????RELAT_NODE_NOT_FOUND?=?1
*??????NODE_NOT_FOUND???????=?2
*??????others???????????????=?3
??????????.
??IF?SY-SUBRC?<>?0.
*???MESSAGE?ID?SY-MSGID?TYPE?SY-MSGTY?NUMBER?SY-MSGNO
*??????????????WITH?SY-MSGV1?SY-MSGV2?SY-MSGV3?SY-MSGV4.
??ENDIF.
ENDFORM.????????????????????"?AddMonth
*&---------------------------------------------------------------------*
*&??????Form??AddCarrid
*&---------------------------------------------------------------------*
*???????text
*----------------------------------------------------------------------*
*??????-->P_T_CARRID??text
*??????-->P_K_MONTH??text
*??????<--P_K_CARRID??text
*----------------------------------------------------------------------*
FORM?AddCarrid??USING????P_T_CARRID?TYPE??sflight-carrid
?????????????????????????P_K_MONTH?TYPE?lvc_nkey
????????????????CHANGING?P_K_CARRID?TYPE?lvc_nkey.
??DATA:?g_sflight?TYPE?sflight,
????????l_node_text?type?lvc_value.
??l_node_text?=?P_T_CARRID.
??CALL?METHOD?g_alv_tree->ADD_NODE
????EXPORTING
??????I_RELAT_NODE_KEY?????=?P_K_MONTH
??????I_RELATIONSHIP???????=?cl_gui_column_tree=>relat_last_child
??????IS_OUTTAB_LINE???????=?g_sflight
*??????IS_NODE_LAYOUT???????=
*??????IT_ITEM_LAYOUT???????=
??????I_NODE_TEXT??????????=?l_node_text
????IMPORTING
??????E_NEW_NODE_KEY???????=?P_K_CARRID
*????EXCEPTIONS
*??????RELAT_NODE_NOT_FOUND?=?1
*??????NODE_NOT_FOUND???????=?2
*??????others???????????????=?3
??????????.
??IF?SY-SUBRC?<>?0.
*???MESSAGE?ID?SY-MSGID?TYPE?SY-MSGTY?NUMBER?SY-MSGNO
*??????????????WITH?SY-MSGV1?SY-MSGV2?SY-MSGV3?SY-MSGV4.
??ENDIF.
ENDFORM.????????????????????"?AddCarrid
*&---------------------------------------------------------------------*
*&??????Form??AddLine
*&---------------------------------------------------------------------*
*???????text
*----------------------------------------------------------------------*
*??????-->P_LS_SFLIGHT??text
*??????-->P_K_CARRID??text
*??????<--P_K_LAST??text
*----------------------------------------------------------------------*
FORM?AddLine??USING????P_LS_SFLIGHT?TYPE?sflight
???????????????????????P_K_CARRID?TYPE?lvc_nkey
??????????????CHANGING?P_K_LAST?TYPE?lvc_nkey.
??DATA:?l_node_text?type?lvc_value.
??l_node_text?=?P_LS_SFLIGHT-fldate.
??CALL?METHOD?g_alv_tree->ADD_NODE
????EXPORTING
??????I_RELAT_NODE_KEY?????=?P_K_CARRID
??????I_RELATIONSHIP???????=?cl_gui_column_tree=>relat_last_child
??????IS_OUTTAB_LINE???????=?P_LS_SFLIGHT
*??????IS_NODE_LAYOUT???????=
*??????IT_ITEM_LAYOUT???????=
??????I_NODE_TEXT??????????=?l_node_text
????IMPORTING
??????E_NEW_NODE_KEY???????=?P_K_LAST
*????EXCEPTIONS
*??????RELAT_NODE_NOT_FOUND?=?1
*??????NODE_NOT_FOUND???????=?2
*??????others???????????????=?3
??????????.
??IF?SY-SUBRC?<>?0.
*???MESSAGE?ID?SY-MSGID?TYPE?SY-MSGTY?NUMBER?SY-MSGNO
*??????????????WITH?SY-MSGV1?SY-MSGV2?SY-MSGV3?SY-MSGV4.
??ENDIF.
ENDFORM.????????????????????"?AddLine???

??????

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