ABAP Tree Control的使用
Tree Control是最常用的Windows控件之一，在其他语言中，称为“Tree View”等，ABAP的Tree Control能完成相似的功能，本章主要介绍以下实例：
(1)实现一个简单的Tree Control；
(2)建立有数据表接口的Tree Control对象；
(3)通过右键菜单完成Tree Control节点的增删修改等功能；
(4)Tree Control对象与ALV Grid对象关联，实现在双击Tree节点时，变更ALV Grid的显示。
(1)建立一个以国家、城市、城区三层的Tree Control对象(固定数据)；
(1)建立一个ABAP程序；
(2)使用屏幕制作器，建立 Screen。
A、添加“定制控制”对象；
B、添加两个文本框，存放节点KEY值和节点文本值。
(3)建立程序
A、处理窗口调用，退出等基本功能；
B、创建窗口定制对象，Tree Control对象，测试运行时能看到TREE区域
C、实现Tree节点的创建，测试运行，能看到Tree的所有节点；
D、定义对象，建立双击方法，并将双击方法分配Tree对象，实现双击事件。
(1)实现一个简单的Tree Control；
(2)建立有数据表接口的Tree Control对象；
(3)通过右键菜单完成Tree Control节点的增删修改等功能；
(4)Tree Control对象与ALV Grid对象关联，实现在双击Tree节点时，变更ALV Grid的显示。
1、简单的Tree Control实例
本例将实现以下功能：(1)建立一个以国家、城市、城区三层的Tree Control对象(固定数据)；
(2)当双击某个节点时，在文本框显示选中节点的KEY值和文本值。
(1)建立一个ABAP程序；
(2)使用屏幕制作器，建立 Screen。
A、添加“定制控制”对象；
B、添加两个文本框，存放节点KEY值和节点文本值。
(3)建立程序
A、处理窗口调用，退出等基本功能；
B、创建窗口定制对象，Tree Control对象，测试运行时能看到TREE区域
C、实现Tree节点的创建，测试运行，能看到Tree的所有节点；
D、定义对象，建立双击方法，并将双击方法分配Tree对象，实现双击事件。
建立好的屏幕和对象界面如图：
逻辑流程序：
PROCESS BEFORE OUTPUT. MODULE STATUS_0100. * PROCESS AFTER INPUT. MODULE USER_COMMAND_0100.主程序：
REPORT Z_TREETEST_20160629001.
*功能码返回值
DATA: OK_CODE TYPE SY-UCOMM,
SAVE_OK TYPE SY-UCOMM.
*定制对象
DATA: WA_CONTAINER TYPE SCRFNAME VALUE 'TREE',
*客户对象
WA_CUSTOM_CONTAINER TYPE REF TO CL_GUI_CUSTOM_CONTAINER,
WA_TREE TYPE REF TO CL_GUI_SIMPLE_TREE.
*NODE节点表
DATA: NODE_TABLE LIKE TABLE OF MTREESNODE,
*节点
NODE1 TYPE MTREESNODE.
*定义内表，变量需要传递，不加HEADER LINE
DATA WA_SPFLI TYPE TABLE OF SPFLI.
*当双击时取得节点KEY值与节点文本值变量
DATA: NODEKEY(200) VALUE 'NODE', NODETEXT(200) VALUE 'NODE'.
*定义对象，定义对象的双击方法，用于将该对象双击方法分配到树双击事件
CLASS LCL_APPLICATION DEFINITION DEFERRED.
CLASS LCL_APPLICATION DEFINITION.
PUBLIC SECTION.
*自定义双击方法，参数为节点关键字
METHODS HANDLE_NODE_DOUBLE_CLICK
FOR EVENT NODE_DOUBLE_CLICK
OF CL_GUI_SIMPLE_TREE
IMPORTING NODE_KEY.
ENDCLASS.
CLASS LCL_APPLICATION IMPLEMENTATION.
METHOD HANDLE_NODE_DOUBLE_CLICK.
NODEKEY = NODE_KEY.
READ TABLE NODE_TABLE WITH KEY NODE_KEY = NODE_KEY INTO NODE1.
NODETEXT = NODE1-TEXT.
ENDMETHOD.
ENDCLASS.
*自定义对象实例
DATA: G_APPLICATION TYPE REF TO LCL_APPLICATION.
START-OF-SELECTION.
CREATE OBJECT G_APPLICATION.
CALL SCREEN 100.
MODULE STATUS_0100 OUTPUT.
IF WA_CUSTOM_CONTAINER IS INITIAL.
PERFORM CREATE_TREE.
ENDIF.
ENDMODULE.
MODULE USER_COMMAND_0100 INPUT.
SAVE_OK = OK_CODE.
CLEAR OK_CODE.
CASE SAVE_OK.
WHEN 'CANCEL'.
LEAVE PROGRAM.
ENDCASE.
ENDMODULE.
FORM CREATE_TREE.
*事件内表及单个事件对象.
DATA: EVENTS TYPE CNTL_SIMPLE_EVENTS,
EVENT1 TYPE CNTL_SIMPLE_EVENT.
*建立定制控制对象
CREATE OBJECT WA_CUSTOM_CONTAINER
EXPORTING
CONTAINER_NAME = WA_CONTAINER.
*建立树对象
CREATE OBJECT WA_TREE
EXPORTING
PARENT = WA_CUSTOM_CONTAINER
NODE_SELECTION_MODE = CL_GUI_SIMPLE_TREE=>NODE_SEL_MODE_SINGLE.
IF SY-SUBRC <> 0.
ENDIF.
*开始建立以国家->城市->城区 三层的树
CLEAR NODE1.
*节点关键字
NODE1-NODE_KEY = 'CHINA'.
*第一层
CLEAR NODE1-RELATKEY.
CLEAR NODE1-RELATSHIP.
*是文件夹
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
*不带ICON
CLEAR NODE1-N_IMAGE.
CLEAR NODE1-EXP_IMAGE.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = '中国'.
APPEND NODE1 TO NODE_TABLE.
*二层节点
CLEAR NODE1.
NODE1-NODE_KEY = 'BJ'.
*上层关系
NODE1-RELATKEY = 'CHINA'.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
CLEAR NODE1-N_IMAGE.
CLEAR NODE1-EXP_IMAGE.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = '北京'.
APPEND NODE1 TO NODE_TABLE.
CLEAR NODE1.
NODE1-NODE_KEY = 'SH'.
NODE1-RELATKEY = 'CHINA'.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
CLEAR NODE1-N_IMAGE.
CLEAR NODE1-EXP_IMAGE.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = '上海'.
APPEND NODE1 TO NODE_TABLE.
*三层节点
CLEAR NODE1.
NODE1-NODE_KEY = 'CWQ'.
NODE1-RELATKEY = 'BJ'.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = ''.
*图标，可运行SHOWICON查阅
NODE1-N_IMAGE = '@9Y@'.
NODE1-EXP_IMAGE = '@9Y@'.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = '崇文区'.
APPEND NODE1 TO NODE_TABLE.
CLEAR NODE1.
NODE1-NODE_KEY = 'XCQ'.
NODE1-RELATKEY = 'BJ'.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = ''.
NODE1-N_IMAGE = '@DF@'.
NODE1-EXP_IMAGE = '@DF@'.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = '西城区'.
APPEND NODE1 TO NODE_TABLE.
CLEAR NODE1.
NODE1-NODE_KEY = 'MXQ'.
NODE1-RELATKEY = 'SH'.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = ''.
NODE1-N_IMAGE = '@NL@'.
NODE1-EXP_IMAGE = '@NL@'.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = '闵行区'.
APPEND NODE1 TO NODE_TABLE.
*按照节点内容添加节点
CALL METHOD WA_TREE->ADD_NODES
EXPORTING
TABLE_STRUCTURE_NAME = 'MTREESNODE'
NODE_TABLE = NODE_TABLE.
IF SY-SUBRC <> 0.
ENDIF.
*定义双击事件
EVENT1-EVENTID = CL_GUI_SIMPLE_TREE=>EVENTID_NODE_DOUBLE_CLICK.
EVENT1-APPL_EVENT = 'X'.
APPEND EVENT1 TO EVENTS.
*添加事件内表
CALL METHOD WA_TREE->SET_REGISTERED_EVENTS
EXPORTING
EVENTS = EVENTS.
IF SY-SUBRC <> 0.
ENDIF.
*将已定义的双击事件分配至树对象
SET HANDLER G_APPLICATION->HANDLE_NODE_DOUBLE_CLICK FOR WA_TREE.
ENDFORM.
2、建立有数据表接口的Tree Control对象
先从数据表读取结构，并按照数据关系建立Tree Control，如图
以航班表为例，以“起飞国家-->航班承运人-->航班连接”三层组成。
建立好的屏幕和对象界面如图：
元素清单如图：
逻辑流程序：
PROCESS BEFORE OUTPUT. MODULE STATUS_0100. * PROCESS AFTER INPUT. MODULE USER_COMMAND_0100.主程序：
REPORT Z_TREETEST_20160629002.
DATA: OK_CODE TYPE SY-UCOMM,
SAVE_OK TYPE SY-UCOMM.
*定制对象
DATA: WA_CONTAINER TYPE SCRFNAME VALUE 'TREE',
*客户对象
WA_CUSTOM_CONTAINER TYPE REF TO CL_GUI_CUSTOM_CONTAINER,
WA_TREE TYPE REF TO CL_GUI_SIMPLE_TREE.
*NODE节点表
DATA: NODE_TABLE LIKE TABLE OF MTREESNODE,
*节点
NODE1 TYPE MTREESNODE.
DATA WA_SPFLI TYPE TABLE OF SPFLI WITH HEADER LINE.
START-OF-SELECTION.
SELECT * INTO TABLE WA_SPFLI FROM SPFLI
ORDER BY COUNTRYFR CARRID CONNID ASCENDING.
SET SCREEN 100.
MODULE STATUS_0100 OUTPUT.
IF WA_CUSTOM_CONTAINER IS INITIAL.
PERFORM CREATE_TREE.
ENDIF.
ENDMODULE.
MODULE USER_COMMAND_0100 INPUT.
SAVE_OK = OK_CODE.
CLEAR OK_CODE.
CASE SAVE_OK.
WHEN 'CANCEL'.
LEAVE TO SCREEN 0.
ENDCASE.
ENDMODULE.
FORM CREATE_TREE.
*建立定制控制对象
CREATE OBJECT WA_CUSTOM_CONTAINER
EXPORTING
CONTAINER_NAME = WA_CONTAINER.
*建立树对象
CREATE OBJECT WA_TREE
EXPORTING
PARENT = WA_CUSTOM_CONTAINER
NODE_SELECTION_MODE = CL_GUI_SIMPLE_TREE=>NODE_SEL_MODE_SINGLE.
IF SY-SUBRC <> 0.
ENDIF.
DATA: COUNTRYFR LIKE SPFLI-COUNTRYFR,
CARRID LIKE SPFLI-CARRID.
DATA:STR1(255).
LOOP AT WA_SPFLI.
IF COUNTRYFR NE WA_SPFLI-COUNTRYFR.
CLEAR NODE1.
NODE1-NODE_KEY = WA_SPFLI-COUNTRYFR.
*第一层
CLEAR NODE1-RELATKEY.
CLEAR NODE1-RELATSHIP.
*是文件夹
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
*不带ICON
CLEAR NODE1-N_IMAGE.
CLEAR NODE1-EXP_IMAGE.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = WA_SPFLI-COUNTRYFR.
APPEND NODE1 TO NODE_TABLE.
ENDIF.
IF ( COUNTRYFR NE WA_SPFLI-COUNTRYFR ) OR ( CARRID <> WA_SPFLI-CARRID ).
CLEAR NODE1.
CONCATENATE WA_SPFLI-COUNTRYFR WA_SPFLI-CARRID INTO NODE1-NODE_KEY.
*上层关系
NODE1-RELATKEY = WA_SPFLI-COUNTRYFR.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
CLEAR NODE1-N_IMAGE.
CLEAR NODE1-EXP_IMAGE.
CLEAR NODE1-EXPANDER.
*节点显示CARRID
NODE1-TEXT = WA_SPFLI-CARRID.
APPEND NODE1 TO NODE_TABLE.
ENDIF.
COUNTRYFR = WA_SPFLI-COUNTRYFR.
CARRID = WA_SPFLI-CARRID.
CLEAR NODE1.
CONCATENATE WA_SPFLI-COUNTRYFR WA_SPFLI-CARRID
WA_SPFLI-CONNID INTO NODE1-NODE_KEY.
CONCATENATE WA_SPFLI-COUNTRYFR WA_SPFLI-CARRID INTO STR1.
NODE1-RELATKEY = STR1.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
NODE1-N_IMAGE = '@5B@'.
NODE1-EXP_IMAGE = '@5B@'.
CLEAR NODE1-EXPANDER.
CONCATENATE WA_SPFLI-CARRID ':' WA_SPFLI-CITYFROM INTO STR1.
NODE1-TEXT = STR1.
APPEND NODE1 TO NODE_TABLE.
ENDLOOP.
*按照节点内容添加节点
CALL METHOD WA_TREE->ADD_NODES
EXPORTING
TABLE_STRUCTURE_NAME = 'MTREESNODE'
NODE_TABLE = NODE_TABLE.
IF SY-SUBRC <> 0.
ENDIF.
ENDFORM.
3、通过右键菜单完成Tree Control节点的增删改功能
Tree节点的增删改是很重要的功能，包括：增加本级节点，增加子节点，修改节点，删除节点。完成后效果如下：选择根节点，单击右键，弹出右键菜单，如选择“北京”节点，选择“增加本级节点”菜单，如图
在单击文本输入“广州”后，单击“更新”按钮，如图
Tree对象增加了“广州”节点，选择该节点，选右键菜单中“增加子节点”菜单，如图
输入”天河区“，单击”更新“按钮，如图
增加节点后，输出结果如图
建立好的屏幕和对象界面如图：
元素清单如图：
逻辑流程序：
PROCESS BEFORE OUTPUT. MODULE STATUS_0100. * PROCESS AFTER INPUT. MODULE USER_COMMAND_0100.
主程序：
REPORT z_treetest_20160630001.
DATA: ok_code TYPE sy-ucomm,
save_ok TYPE sy-ucomm.
DATA: wa_container TYPE scrfname VALUE 'TREE',
wa_custom_container TYPE REF TO cl_gui_custom_container,
wa_tree TYPE REF TO cl_gui_simple_tree.
DATA: node_table LIKE TABLE OF mtreesnode,
anode_table LIKE TABLE OF mtreesnode,
node1 TYPE mtreesnode,
node2 TYPE mtreesnode.
DATA wa_spfli TYPE TABLE OF spfli.
DATA: nodekey(200) VALUE 'NODE',
nodetext(200) VALUE 'NODE',
nodekeyold(200) VALUE 'NODE',
getkey(200).
DATA menustr(10) VALUE ''.
CLASS lcl_application DEFINITION DEFERRED.
*----------------------------------------------------------------------*
* CLASS LCL_APPLICATION DEFINITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS lcl_application DEFINITION.
PUBLIC SECTION.
METHODS:
handle_node_double_click
FOR EVENT node_double_click
OF cl_gui_simple_tree
IMPORTING node_key.
METHODS:
handle_node_context_menu_req
FOR EVENT node_context_menu_request
OF cl_gui_simple_tree
IMPORTING node_key menu.
METHODS:
handle_node_context_menu_sel
FOR EVENT node_context_menu_select
OF cl_gui_simple_tree
IMPORTING node_key fcode.
ENDCLASS. "LCL_APPLICATION DEFINITION
*----------------------------------------------------------------------*
* CLASS LCL_APPLICATION IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS lcl_application IMPLEMENTATION.
METHOD handle_node_double_click.
nodekey = node_key.
READ TABLE node_table WITH KEY node_key = node_key INTO node1.
nodetext = node1-text.
ENDMETHOD. "HANDLE_NODE_DOUBLE_CLICK
METHOD handle_node_context_menu_req.
CALL METHOD menu->add_function
EXPORTING
text = '增加本级节点'
fcode = 'CODE1'.
CALL METHOD menu->add_function
EXPORTING
text = '增加子节点'
fcode = 'CODE2'.
CALL METHOD menu->add_function
EXPORTING
text = '修改当前节点'
fcode = 'CODE3'.
CALL METHOD menu->add_function
EXPORTING
text = '删除当前节点'
fcode = 'CODE4'.
ENDMETHOD. "HANDLE_NODE_CONTEXT_MENU_REQ
METHOD handle_node_context_menu_sel.
DATA str1 TYPE tv_nodekey.
CALL METHOD wa_tree->get_selected_node
IMPORTING
node_key = str1.
IF sy-subrc = 0.
menustr = fcode.
nodekey = str1.
nodekeyold = str1.
READ TABLE node_table WITH KEY node_key = nodekey INTO node1.
nodetext = node1-text.
IF fcode = 'CODE4'.
CALL METHOD wa_tree->delete_node
EXPORTING
node_key = node1-node_key.
DELETE node_table WHERE node_key = nodekey.
ENDIF.
ENDIF.
ENDMETHOD. "HANDLE_NODE_CONTEXT_MENU_SEL
ENDCLASS. "LCL_APPLICATION IMPLEMENTATION
DATA: g_application TYPE REF TO lcl_application.
START-OF-SELECTION.
CALL SCREEN 100.
*----------------------------------------------------------------------*
* MODULE STATUS_0100 OUTPUT
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
MODULE status_0100 OUTPUT.
IF wa_custom_container IS INITIAL.
CREATE OBJECT g_application.
PERFORM create_tree.
ENDIF.
ENDMODULE. "STATUS_0100 OUTPUT
*----------------------------------------------------------------------*
* MODULE USER_COMMAND_0100 INPUT
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
MODULE user_command_0100 INPUT.
DATA str1 TYPE tv_nodekey.
save_ok = ok_code.
CLEAR ok_code.
CASE save_ok.
WHEN 'CANCEL'.
LEAVE PROGRAM.
WHEN 'GETKEY'.
CALL METHOD wa_tree->get_selected_node
IMPORTING
node_key = str1.
IF sy-subrc EQ 0.
getkey = str1.
ENDIF.
WHEN 'UPDATE'.
IF ( menustr = 'CODE1' ) OR ( menustr = 'CODE2').
READ TABLE node_table
WITH KEY node_key = nodekey INTO node1.
IF sy-subrc EQ 0.
MESSAGE e208(00) WITH '键值重复！'.
ENDIF.
ENDIF.
CASE menustr.
WHEN 'CODE1'.
READ TABLE node_table WITH KEY node_key = nodekeyold INTO node2.
CLEAR node1.
node1-node_key = nodekey.
node1-relatkey = node2-relatkey.
node1-relatship = cl_gui_simple_tree=>relat_last_child.
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = 'X'.
node1-n_image = '@G3@'.
node1-exp_image = '@G3@'.
CLEAR node1-expander.
node1-text = nodetext.
APPEND node1 TO node_table.
CLEAR anode_table.
APPEND node1 TO anode_table.
CALL METHOD wa_tree->add_nodes
EXPORTING
table_structure_name = 'MTREESNODE'
node_table = anode_table.
IF sy-subrc <> 0.
ENDIF.
WHEN 'CODE2'.
CLEAR node1.
node1-node_key = nodekey.
node1-relatkey = nodekeyold.
node1-relatship = cl_gui_simple_tree=>relat_last_child.
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = 'X'.
node1-n_image = '@G3@'.
node1-exp_image = '@G3@'.
CLEAR node1-expander.
node1-text = nodetext.
APPEND node1 TO node_table.
CLEAR anode_table.
APPEND node1 TO anode_table.
CALL METHOD wa_tree->add_nodes
EXPORTING
table_structure_name = 'MTREESNODE'
node_table = anode_table.
IF sy-subrc <> 0.
ENDIF.
WHEN 'CODE3'.
node1-node_key = nodekeyold.
CALL METHOD wa_tree->node_set_text
EXPORTING
node_key = node1-node_key
text = nodetext.
IF sy-subrc <> 0.
ENDIF.
ENDCASE.
ENDCASE.
ENDMODULE. "USER_COMMAND_0100 INPUT
*&---------------------------------------------------------------------*
*& Form CREATE_TREE
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
FORM create_tree.
*事件内表及单个事件对象.
DATA: events TYPE cntl_simple_events,
event1 TYPE cntl_simple_event.
*建立定制控制对象
CREATE OBJECT wa_custom_container
EXPORTING
container_name = wa_container.
*建立树对象
CREATE OBJECT wa_tree
EXPORTING
parent = wa_custom_container
node_selection_mode = cl_gui_simple_tree=>node_sel_mode_single.
IF sy-subrc <> 0.
ENDIF.
*开始建立以国家->城市->城区 三层的树
CLEAR node1.
*节点关键字
node1-node_key = 'CHINA'.
*第一层
CLEAR node1-relatkey.
CLEAR node1-relatship.
*是文件夹
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = 'X'.
*不带ICON
CLEAR node1-n_image.
CLEAR node1-exp_image.
CLEAR node1-expander.
node1-text = '中国'.
APPEND node1 TO node_table.
*二层节点
CLEAR node1.
node1-node_key = 'BJ'.
*上层关系
node1-relatkey = 'CHINA'.
node1-relatship = cl_gui_simple_tree=>relat_last_child.
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = 'X'.
CLEAR node1-n_image.
CLEAR node1-exp_image.
CLEAR node1-expander.
node1-text = '北京'.
APPEND node1 TO node_table.
CLEAR node1.
node1-node_key = 'SH'.
node1-relatkey = 'CHINA'.
node1-relatship = cl_gui_simple_tree=>relat_last_child.
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = 'X'.
CLEAR node1-n_image.
CLEAR node1-exp_image.
CLEAR node1-expander.
node1-text = '上海'.
APPEND node1 TO node_table.
*三层节点
CLEAR node1.
node1-node_key = 'CWQ'.
node1-relatkey = 'BJ'.
node1-relatship = cl_gui_simple_tree=>relat_last_child.
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = ''.
*图标，可运行SHOWICON查阅
node1-n_image = '@9Y@'.
node1-exp_image = '@9Y@'.
CLEAR node1-expander.
node1-text = '崇文区'.
APPEND node1 TO node_table.
CLEAR node1.
node1-node_key = 'XCQ'.
node1-relatkey = 'BJ'.
node1-relatship = cl_gui_simple_tree=>relat_last_child.
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = ''.
node1-n_image = '@DF@'.
node1-exp_image = '@DF@'.
CLEAR node1-expander.
node1-text = '西城区'.
APPEND node1 TO node_table.
CLEAR node1.
node1-node_key = 'MXQ'.
node1-relatkey = 'SH'.
node1-relatship = cl_gui_simple_tree=>relat_last_child.
node1-hidden = ''.
node1-disabled = ''.
node1-isfolder = ''.
node1-n_image = '@NL@'.
node1-exp_image = '@NL@'.
CLEAR node1-expander.
node1-text = '闵行区'.
APPEND node1 TO node_table.
*按照节点内容添加节点
CALL METHOD wa_tree->add_nodes
EXPORTING
table_structure_name = 'MTREESNODE'
node_table = node_table.
IF sy-subrc <> 0.
ENDIF.
*定义双击事件
event1-eventid = cl_gui_simple_tree=>eventid_node_double_click.
event1-appl_event = 'X'.
APPEND event1 TO events.
*添加事件内表
CALL METHOD wa_tree->set_registered_events
EXPORTING
events = events.
IF sy-subrc <> 0.
ENDIF.
CALL METHOD wa_tree->expand_node
EXPORTING
node_key = 'CHINA'
expand_subtree = 'X'
EXCEPTIONS
failed = 1
illegal_level_count = 2
cntl_system_error = 3
node_not_found = 4
cannot_expand_leaf = 5.
IF sy-subrc NE 0.
ENDIF.
*定义双击事件
event1-eventid = cl_gui_simple_tree=>eventid_node_double_click.
event1-appl_event = 'X'.
APPEND event1 TO events.
event1-eventid = cl_gui_simple_tree=>eventid_node_context_menu_req.
event1-appl_event = ''.
APPEND event1 TO events.
CALL METHOD wa_tree->set_ctx_menu_select_event_appl
EXPORTING
appl_event = 'X'.
*添加事件内表
CALL METHOD wa_tree->set_registered_events
EXPORTING
events = events.
*将已定义的双击事件分配至树对象
SET HANDLER g_application->handle_node_double_click FOR wa_tree.
SET HANDLER g_application->handle_node_context_menu_req FOR wa_tree.
SET HANDLER g_application->handle_node_context_menu_sel FOR wa_tree.
ENDFORM. "CREATE_TREE
4、Tree Control对象与ALV Grid对象关联
在双击Tree对象时，变更ALV Grid对象的显示，实现界面如图
建立好的屏幕和对象界面如图：
元素清单如图：
逻辑流程序：
PROCESS BEFORE OUTPUT. MODULE STATUS_0100. * PROCESS AFTER INPUT. MODULE USER_COMMAND_0100.主程序：
REPORT Z_TREETEST_20160630002.
DATA: OK_CODE TYPE SY-UCOMM,
SAVE_OK TYPE SY-UCOMM.
DATA: WA_CONTAINER TYPE SCRFNAME VALUE 'TREE',
WA_CONTAINERALV TYPE SCRFNAME VALUE 'ALV',
WA_CUSTOM_CONTAINER TYPE REF TO CL_GUI_CUSTOM_CONTAINER,
WA_CUSTOM_CONTAINERALV TYPE REF TO CL_GUI_CUSTOM_CONTAINER,
WA_TREE TYPE REF TO CL_GUI_SIMPLE_TREE,
WA_ALV TYPE REF TO CL_GUI_ALV_GRID.
DATA: NODE_TABLE LIKE TABLE OF MTREESNODE,
NODE1 TYPE MTREESNODE.
DATA WA_SPFLI TYPE TABLE OF SPFLI WITH HEADER LINE.
DATA WA_SFLIGHT TYPE TABLE OF SFLIGHT.
DATA: NODEKEY(200) VALUE 'NODE',
NODETEXT(200) VALUE 'NODE'.
CLASS LCL_APPLICATION DEFINITION DEFERRED.
DATA EVENT_RECEIVER TYPE REF TO LCL_APPLICATION.
CLASS LCL_APPLICATION DEFINITION.
PUBLIC SECTION.
METHODS HANDLE_NODE_DOUBLE_CLICK
FOR EVENT NODE_DOUBLE_CLICK
OF CL_GUI_SIMPLE_TREE
IMPORTING NODE_KEY.
ENDCLASS.
CLASS LCL_APPLICATION IMPLEMENTATION.
METHOD HANDLE_NODE_DOUBLE_CLICK.
NODEKEY = NODE_KEY.
READ TABLE NODE_TABLE WITH KEY NODE_KEY = NODE_KEY INTO NODE1.
NODETEXT = NODE1-TEXT.
CLEAR WA_SFLIGHT.
SELECT * INTO TABLE WA_SFLIGHT FROM SFLIGHT
WHERE CARRID = NODE1-NODE_KEY+2(2)
AND CONNID = NODE1-NODE_KEY+4(4).
CALL METHOD WA_ALV->SET_TABLE_FOR_FIRST_DISPLAY
EXPORTING
I_STRUCTURE_NAME = 'SFLIGHT'
CHANGING
IT_OUTTAB = WA_SFLIGHT.
ENDMETHOD.
ENDCLASS.
DATA G_APPLICATION TYPE REF TO LCL_APPLICATION.
START-OF-SELECTION.
SELECT * INTO TABLE WA_SPFLI FROM SPFLI
ORDER BY COUNTRYFR CARRID ASCENDING.
CREATE OBJECT G_APPLICATION.
SET SCREEN 100.
MODULE STATUS_0100 OUTPUT.
IF WA_CUSTOM_CONTAINER IS INITIAL.
PERFORM CREATE_TREE.
ENDIF.
ENDMODULE.
MODULE USER_COMMAND_0100 INPUT.
SAVE_OK = OK_CODE.
CLEAR OK_CODE.
CASE SAVE_OK.
WHEN 'CANCEL'.
LEAVE PROGRAM.
ENDCASE.
ENDMODULE.
FORM CREATE_TREE.
DATA: EVENTS TYPE CNTL_SIMPLE_EVENTS,
EVENT1 TYPE CNTL_SIMPLE_EVENT.
*建立定制控制对象
CREATE OBJECT WA_CUSTOM_CONTAINER
EXPORTING
CONTAINER_NAME = WA_CONTAINER.
*创建ALV对象
CREATE OBJECT WA_CUSTOM_CONTAINERALV
EXPORTING
CONTAINER_NAME = WA_CONTAINERALV.
CREATE OBJECT WA_ALV
EXPORTING
I_PARENT = WA_CUSTOM_CONTAINERALV.
*建立树对象
CREATE OBJECT WA_TREE
EXPORTING
PARENT = WA_CUSTOM_CONTAINER
NODE_SELECTION_MODE = CL_GUI_SIMPLE_TREE=>NODE_SEL_MODE_SINGLE.
IF SY-SUBRC <> 0.
ENDIF.
DATA: COUNTRYFR LIKE SPFLI-COUNTRYFR,
CARRID LIKE SPFLI-CARRID.
DATA:STR1(255).
LOOP AT WA_SPFLI.
IF COUNTRYFR NE WA_SPFLI-COUNTRYFR.
CLEAR NODE1.
NODE1-NODE_KEY = WA_SPFLI-COUNTRYFR.
*第一层
CLEAR NODE1-RELATKEY.
CLEAR NODE1-RELATSHIP.
*是文件夹
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
*不带ICON
CLEAR NODE1-N_IMAGE.
CLEAR NODE1-EXP_IMAGE.
CLEAR NODE1-EXPANDER.
NODE1-TEXT = WA_SPFLI-COUNTRYFR.
APPEND NODE1 TO NODE_TABLE.
ENDIF.
IF ( COUNTRYFR NE WA_SPFLI-COUNTRYFR ) OR ( CARRID <> WA_SPFLI-CARRID ).
CLEAR NODE1.
CONCATENATE WA_SPFLI-COUNTRYFR WA_SPFLI-CARRID INTO NODE1-NODE_KEY.
*上层关系
NODE1-RELATKEY = WA_SPFLI-COUNTRYFR.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
CLEAR NODE1-N_IMAGE.
CLEAR NODE1-EXP_IMAGE.
CLEAR NODE1-EXPANDER.
*节点显示CARRID
NODE1-TEXT = WA_SPFLI-CARRID.
APPEND NODE1 TO NODE_TABLE.
ENDIF.
COUNTRYFR = WA_SPFLI-COUNTRYFR.
CARRID = WA_SPFLI-CARRID.
CLEAR NODE1.
CONCATENATE WA_SPFLI-COUNTRYFR WA_SPFLI-CARRID
WA_SPFLI-CONNID INTO NODE1-NODE_KEY.
CONCATENATE WA_SPFLI-COUNTRYFR WA_SPFLI-CARRID INTO STR1.
NODE1-RELATKEY = STR1.
NODE1-RELATSHIP = CL_GUI_SIMPLE_TREE=>RELAT_LAST_CHILD.
NODE1-HIDDEN = ''.
NODE1-DISABLED = ''.
NODE1-ISFOLDER = 'X'.
NODE1-N_IMAGE = '@5B@'.
NODE1-EXP_IMAGE = '@5B@'.
CLEAR NODE1-EXPANDER.
CONCATENATE WA_SPFLI-CARRID ':' WA_SPFLI-CITYFROM INTO STR1.
NODE1-TEXT = STR1.
APPEND NODE1 TO NODE_TABLE.
ENDLOOP.
*按照节点内容添加节点
CALL METHOD WA_TREE->ADD_NODES
EXPORTING
TABLE_STRUCTURE_NAME = 'MTREESNODE'
NODE_TABLE = NODE_TABLE.
IF SY-SUBRC <> 0.
ENDIF.
*定义双击事件
EVENT1-EVENTID = CL_GUI_SIMPLE_TREE=>EVENTID_NODE_DOUBLE_CLICK.
EVENT1-APPL_EVENT = 'X'.
APPEND EVENT1 TO EVENTS.
CALL METHOD WA_TREE->SET_REGISTERED_EVENTS
EXPORTING
EVENTS = EVENTS.
IF SY-SUBRC <> 0.
ENDIF.
*将已定义的双击事件分配至树对象
SET HANDLER G_APPLICATION->HANDLE_NODE_DOUBLE_CLICK FOR WA_TREE.
ENDFORM.