Source for the Employee Drag-and-Drop Tree
Copy and paste this code to a form and compile and execute it. Note that you must have the Source for the DD_EMPPL Payload in a compiled reusable part for this example to work.
FUNCTION options(*DIRECT)
BEGIN_COM role(*EXTENDS #PRIM_FORM) CAPTION('Move Employees') HEIGHT(359) LAYOUTMANAGER(#ATLM_1) LEFT(304) TOP(112) WIDTH(274)
DEFINE_COM class(#PRIM_ATLM) name(#ATLM_1)
DEFINE_COM class(#PRIM_TRVW) name(#TRVW_1) DISPLAYPOSITION(1) DRAGSTYLE(Automatic) HEIGHT(332) LEFT(0) PARENT(#COM_OWNER) TABPOSITION(1) TOP(0) WIDTH(266)
DEFINE_COM class(#PRIM_TVCL) name(#TVCL_1) DISPLAYPOSITION(1) KEYPOSITION(1) LEVEL(1) PARENT(#TRVW_1) SORTPOSITION(1) SOURCE(#DEPTMENT)
DEFINE_COM class(#PRIM_TVCL) name(#TVCL_2) DISPLAYPOSITION(1) KEYPOSITION(1) LEVEL(2) PARENT(#TRVW_1) SORTPOSITION(1) SOURCE(#SECTION)
DEFINE_COM class(#PRIM_TVCL) name(#TVCL_3) DISPLAYPOSITION(1) KEYPOSITION(1) LEVEL(3) PARENT(#TRVW_1) SORTPOSITION(1) SOURCE(#EMPNO)
DEFINE_COM class(#PRIM_ATLI) name(#ATLI_1) ATTACHMENT(Center) MANAGE(#TRVW_1) PARENT(#ATLM_1)
DEFINE_COM class(#PRIM_STBR) name(#STBR_1) DISPLAYPOSITION(2) HEIGHT(24) LEFT(0) MESSAGEPOSITION(1) PARENT(#COM_OWNER) TABPOSITION(2) TABSTOP(False) TOP(308) WIDTH(266)
DEFINE_COM class(#PRIM_ATLI) name(#ATLI_4) ATTACHMENT(Bottom) PARENT(#ATLM_1)
* Employee Payload object
DEFINE_COM class(#dd_emppl) name(#PAYLOAD) reference(*dynamic)
DEFINE field(#W_EMPNO) reffld(#EMPNO)
DEFINE field(#W_DEPT) reffld(#DEPTMENT)
DEFINE field(#W_SECT) reffld(#SECTION)
EVTROUTINE handling(#com_owner.CreateInstance) options(*NOCLEARERRORS *NOCLEARMESSAGES)
* Tree view images
SET com(#tvcl_1) IMAGE(#vi_foldcl) IMAGEEXPANDED(#vi_foldop)
SET com(#tvcl_2) IMAGE(#vi_sectcl) IMAGEEXPANDED(#vi_sectop)
SET com(#tvcl_3) IMAGE(#vi_employ)
* Populate Tree
SELECT fields(#TRVW_1) from_file(DEPTAB)
SELECT fields(#TRVW_1) from_file(SECTAB) with_key(#DEPTMENT)
SELECT fields(#TRVW_1) from_file(PSLMST1) with_key(#DEPTMENT #SECTION)
ADD_ENTRY to_list(#TRVW_1)
ENDSELECT
ENDSELECT
ENDSELECT
ENDROUTINE
* Start the drag operation.
* Only allow employees to be "dragged"
EVTROUTINE handling(#TRVW_1.StartDrag) options(*NOCLEARMESSAGES *NOCLEARERRORS) CONTINUE(#continue)
USE builtin(CLR_MESSAGES)
* Create Payload Instance
SET_REF com(#payload) to(*create_as #dd_emppl)
* Only allow employee to be dragged
IF cond('#Trvw_1.currentitem.level = 3')
* Add item to the payload
INVOKE method(#Payload.Add_to_payload) EMPLOYEE_ID(#empno) EMPLOYEE_DEPARTMENT(#deptment) EMPLOYEE_SECTION(#section)
ELSE
SET com(#continue) VALUE(false)
ENDIF
ENDROUTINE
EVTROUTINE handling(#TRVW_1.DragOver) options(*NOCLEARERRORS *NOCLEARMESSAGES) ACCEPTDROP(#acceptdrop) SHOWDROPHILIGHT(#ShowHilight)
* Show Item dragged over
SET com(#showhilight) VALUE(true)
* If a department, employee cannot be dropped
IF_REF com(#trvw_1.currentitem) is_not(*null)
IF cond('(#trvw_1.currentitem.level *ne 1)')
* Allow drop and set new cursor
SET com(#acceptdrop) VALUE(true)
ELSE
* Disable drop
SET com(#acceptdrop) VALUE(False)
ENDIF
ENDIF
ENDROUTINE
EVTROUTINE handling(#TRVW_1.DragDrop) options(*NOCLEARERRORS *NOCLEARMESSAGES)
* If the payload is not empty, get the payload item and add to the treeview in the new section
IF cond('#Payload.Payload_Items *ne *zero')
* Return values in to working fields fields to compare with current item values
INVOKE method(#Payload.Get_Payload_Item) PAYLOAD_ITEM(1) EMPLOYEE_ID(#empno) EMPLOYEE_DEPARTMENT(#w_dept) EMPLOYEE_SECTION(#w_sect)
* If the department and/or section have changed, do the drop
IF cond('(#deptment *ne #W_dept) or (#section *ne #w_sect)')
* Department and section values of currentitem are used
ADD_ENTRY to_list(#TRVW_1)
MESSAGE msgtxt(' Drop Successful')
* Expand Parent items of new drop point
* As drop can only happen on a section, department must be expanded
CHANGE field(#W_DEPT) to(#DEPTMENT)
CHANGE field(#W_SECT) to(#section)
SELECTLIST named(#TRVW_1)
CONTINUE if('#w_dept *ne #deptment')
CONTINUE if('#w_sect *ne #section')
SET com(#trvw_1.currentitem) EXPANDED(true)
LEAVE
ENDSELECT
ENDIF
ENDIF
ENDROUTINE
EVTROUTINE handling(#TRVW_1.EndDrag) options(*NOCLEARERRORS *NOCLEARMESSAGES) DRAGRESULT(#DragResult)
IF cond('#Dragresult.value = Accepted')
* If the department and/or section have changed delete the source employee
IF cond('(#deptment *ne #w_dept) or (#section *ne #w_sect)')
* Get payload item details
INVOKE method(#Payload.Get_Payload_Item) PAYLOAD_ITEM(1) EMPLOYEE_ID(#w_empno) EMPLOYEE_DEPARTMENT(#w_dept) EMPLOYEE_SECTION(#w_sect)
* Locate and Delete source employee
SELECTLIST named(#TRVW_1)
CONTINUE if('#w_dept *ne #deptment')
CONTINUE if('#w_sect *ne #section')
CONTINUE if('#w_empno *ne #empno')
DLT_ENTRY from_list(#TRVW_1)
LEAVE
ENDSELECT
ENDIF
ENDIF
ENDROUTINE
END_COM