ABC: Implementing a Drop List in Edit-In-Place in C5A 1999-04-02 -- Jay Guengerich Newsgroups: topspeed.products.c5ee
Implementing a Drop List in Edit-In-Place for C5EEA, ABC Templates
Note: I tend to use filename.fieldname rather than PRE:fieldname so I'm sure I know
which file I'm referring to. The templates use the PRE:fieldname style, so I left them
that way in embed point references and generated code I have copied below. I use long
key names so I remember which fields are in the key.
Files used in this example:
defcalc
FILE,DRIVER('TOPSPEED'),NAME(DefcalcFileName),PRE(DCAL),CREATE,BINDABLE,THREAD
testtypecalcorderkey KEY(DCAL:testtype,DCAL:calcorder),NOCASE,OPT,PRIMARY
calcidtesttypekey KEY(DCAL:calcid,DCAL:testtype),DUP,NOCASE,OPT
Record RECORD,PRE()
testtype ULONG
calcorder USHORT
calcid ULONG
END
END
calclist
FILE,DRIVER('TOPSPEED'),NAME(CalclistFileName),PRE(CAL),CREATE,BINDABLE,THREAD
calcidkey KEY(CAL:calcid),NOCASE,OPT,PRIMARY
Record RECORD,PRE()
calcid ULONG
calcname STRING(50)
END
END
Relationship:
defcalc <<-> calclist based on the calcid field, which causes the browse template to
generate this view (I have added the comments):
BRW1::View:Browse VIEW(defcalc)
PROJECT(DCAL:testtype) !Col 1
PROJECT(DCAL:calcorder) !Col 2
PROJECT(DCAL:calcid) !Col 3
JOIN(CAL:calcidkey,DCAL:calcid)
PROJECT(CAL:calcid)
PROJECT(CAL:calcname) !Col 4
END
END
Goal:
Create a browse with 4 columns; defcalc.testtype, defcalc.calcorder, defcalc.calcid,
and calclist.calcname. Use default EIP for testtype and calcorder, and a DropList for
calcid. The DropList should be a list of all the records in calclist. For example,
one line in the DropList might be "2 Maximum", indicating there is a record in the
calclist file with a calcid of 2 and a calcname of 'Maximum'. When inserting a record,
prime calcid to 1.
Implementation:
1. Variables declared (STRING(13) is used for calcid instead of a ULONG so I can remove
the leading spaces from the @n13 format):
CalcQ QUEUE,PRE()
calcid STRING(13)
calcname STRING(50)
END
CurrentlyUsed LONG
2. Configure Edit in Place:
Click Colum Specific, Insert. For Field, choose DCAL:calcid. Uncheck "Use Default…".
Check 'Use Application Builder Class?". For "Base Class:", choose EditDropListClass.
3. Embeds:
BRW1.PrimeRecord, after parent call:
defcalc.calcid = 1
EditInPlace::DCAL:calcid.Init, after parent call:
SELF.FEQ{PROP:From} = CalcQ
SELF.FEQ{PROP:Text} = '@s13'
SELF.FEQ{PROP:Drop} = RECORDS(CalcQ)
SELF.FEQ{PROP:Width} = 96
SELF.FEQ{PROP:Format} = '16L@s13@80L@s50@'
! Next section sets DropList to match existing calcid field
CurrentlyUsed = 0
LOOP
CurrentlyUsed += 1
GET(CalcQ,CurrentlyUsed)
UNTIL ERRORCODE() OR CalcQ.calcid = defcalc.calcid
SELECT(SELF.FEQ, CurrentlyUsed)
ThisWindow.Init, after OpenFiles
CLEAR(CalcQ)
Access:calclist.UseFile()
SET(CAL:calcidkey)
LOOP UNTIL Access:calclist.Next()
!The next line removes leading spaces
CalcQ.calcid = LEFT(FORMAT(CAL:calcid,@n13))
CalcQ.calcname = CAL:calcname
ADD(CalcQ)
END
ThisWindow.Kill, before Parent Call
FREE(CalcQ)
I think that covers everything. I'm always open to suggestions for improvement.
Actually, all the end user would really need to see (for my application anyway) is the
defcalc.testtype field and the calclist.calcname field. However, I haven't spent time
to figure out how to get EIP to work for a field that is not in the primary file.
Also, I didn't include much error checking; for example UseFile() returns a value
indicating if the file is ready for use.
Jay Guengerich
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