Navigation: ABC Library Reference > QueryListVisual >====== QueryListVisual–Conceptual Example  ====== |    |
The following example shows a typical sequence of statements to declare, instantiate, initialize, use, and terminate a QueryListVisual object and related objects. The example plugs a QueryListClass into a BrowseClass object. The QueryListClass object uses the QueryListVisual to solicit query criteria (search values) from the end user.
Note that the QueryVisualClass and BrowseClass objects internally handle the normal events surrounding the query.
PROGRAM
_ABCDllMode_ EQUATE(0)
_ABCLinkMode_ EQUATE(1)
INCLUDE('ABWINDOW.INC')
INCLUDE('ABBROWSE.INC')
INCLUDE('ABQUERY.INC')
MAP
END
GlobalErrors ErrorClass
Access:Customer CLASS(FileManager)
Init PROCEDURE
END
Relate:Customer CLASS(RelationManager)
Init PROCEDURE
Kill PROCEDURE,VIRTUAL
END
GlobalRequest BYTE(0),THREAD
GlobalResponse BYTE(0),THREAD
VCRRequest LONG(0),THREAD
Customer FILE,DRIVER('TOPSPEED'),PRE(CUS),CREATE,THREAD
CustomerIDKey KEY(CUS:ID),NOCASE,OPT,PRIMARY
NameKey KEY(CUS:LastName),NOCASE,OPT
Record RECORD,PRE()
ID LONG
LastName STRING(20)
FirstName STRING(15)
City STRING(20)
State STRING(2)
ZIP STRING(10)
END
END
CustView VIEW(Customer)
END
CustQ QUEUE
CUS:LastName LIKE(CUS:LastName)
CUS:FirstName LIKE(CUS:FirstName)
CUS:ZIP LIKE(CUS:ZIP)
ViewPosition STRING(1024)
END
CusWindow WINDOW('Browse Customers'),AT(,,210,105),IMM,SYSTEM,GRAY
LIST,AT(5,5,200,80),USE(?CusList),IMM,HVSCROLL,FROM(CustQ),|
FORMAT('80L(2)|M~Last~@s20@64L(2)|M~First~@s15@44L(2)|M~ZIP~@s10@')
BUTTON('&Query'),AT(50,88),USE(?Query)
BUTTON('Close'),AT(90,88),USE(?Close)
END
ThisWindow CLASS(WindowManager) !declare ThisWindow object
Init PROCEDURE(),BYTE,PROC,VIRTUAL
Kill PROCEDURE(),BYTE,PROC,VIRTUAL
END
Query QueryListClass !declare Query object
QBEWindow QueryListVisual !declare QBEWindow object
BRW1 CLASS(BrowseClass) !declare BRW1 object
Q &CustQ
END
CODE
GlobalErrors.Init
Relate:Customer.Init
GlobalResponse = ThisWindow.Run() !ThisWindow handles all events
Relate:Customer.Kill
GlobalErrors.Kill
ThisWindow.Init PROCEDURE()
ReturnValue BYTE,AUTO
CODE
ReturnValue = PARENT.Init()
IF ReturnValue THEN RETURN ReturnValue.
SELF.FirstField = ?CusList
SELF.VCRRequest &= VCRRequest
SELF.Errors &= GlobalErrors
SELF.AddItem(?Close,RequestCancelled)
Relate:Customer.Open
BRW1.Init(?CusList,CustQ.ViewPosition,CustView,CustQ,Relate:Customer,ThisWindow)
OPEN(CusWindow)
SELF.Opened=True
Query.Init(QBEWindow) !initialize Query object
BRW1.Q &= CustQ
BRW1.AddSortOrder(,CUS:NameKey)
BRW1.AddField(CUS:LastName,BRW1.Q.CUS:LastName)
BRW1.AddField(CUS:FirstName,BRW1.Q.CUS:FirstName)
BRW1.AddField(CUS:ZIP,BRW1.Q.CUS:ZIP)
BRW1.QueryControl = ?Query !register Query button w/ BRW1
BRW1.UpdateQuery(Query) !make each browse item Queryable
Query.AddItem('Cus:State','State') !make State field Queryable too
SELF.SetAlerts()
RETURN ReturnValue
ThisWindow.Kill PROCEDURE()
ReturnValue BYTE,AUTO
CODE
ReturnValue = PARENT.Kill()
IF ReturnValue THEN RETURN ReturnValue.
Relate:Customer.Close
RETURN ReturnValue
Access:Customer.Init PROCEDURE
CODE
PARENT.Init(Customer,GlobalErrors)
SELF.FileNameValue = 'Customer'
SELF.Buffer &= CUS:Record
SELF.Create = 1
SELF.AddKey(CUS:CustomerIDKey,'CUS:CustomerIDKey',1)
SELF.AddKey(CUS:NameKey,'CUS:NameKey',0)
Relate:Customer.Init PROCEDURE
CODE
Access:Customer.Init
PARENT.Init(Access:Customer,1)
Relate:Customer.Kill PROCEDURE
CODE
Access:Customer.Kill
PARENT.Kill