[lazarus] TDBGrid question
hernan.et at pg.com
hernan.et at pg.com
Thu May 22 18:52:35 EDT 2003
Here is what I have done inorder for me to work with TDBGrid.
I added/created a property named BufferCount in TDBGrid class
property BufferCount : Integer Read FBufferCount Write SetBufferCount;
procedure TCustomDBGrid.SetBufferCount(const Count : Integer);
FBufferCount := count;
if Count > RowCount then
FDataLink.BufferCount := count
FDataLink.BufferCount := RowCount;
I changed UpdateBufferCount to
if BufferCount <= RowCount then
FDataLink.BufferCount := RowCount + 1
FDataLink.BufferCount := BufferCount;//buffer count of this class
The reason I did this was that I discovered when I set FDataLink.BufferCount to more than my table's number of records, I can scroll the TDBGrid fine.
Hope you can validate if this work around is correct.
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From: Jesus Reyes <jesusrmx at yahoo.com.mx> on 05/19/2003 05:19 PM GMT
Jesus Reyes To: lazarus at miraclec.com
<jesusrmx at yahoo.com.mx> Cc: (bcc: Yoyong Hernan-ET/PGI)
Subject: Re: [lazarus] TDBGrid question
05/20/2003 01:19 AM
Please respond to
lazarus at miraclec.com
--- Michael Van Canneyt <michael.vancanneyt at wisa.be> escribió: >
> On Mon, 19 May 2003 hernan.et at pg.com wrote:
> > Hi Jesus,
> > I have tried using TDBGrid and it work quite well. But I noticed
> that I cannot
> > scroll backward when my table contains more than 10, (my table
> contains 56
> > rows). I have tried to track it down and it seems that the
> problem is somewhere
> > in TDataset or its parent(s). Can someone have a look on this?
> I've had this issue in the past, and I suspect has something to do
> with the buffer
> scrolling. I have not yet been able to pinpoint the exact error,
> The procedure you want is in dataset.inc, line 1634
> Procedure TDataset.ShiftBuffers (Offset, Distance : longint);
> Subprocedure 'shiftbuffersdown'.
> I currently do not have enough time to look at it, but if someone
> has, the above info may help to pinpoint the exact problem.
Sorry, I missed the original message from Yoyong. Still I can't
reproduce the problem, I have a dataset with hundreds of rows and i
can go forward/backward without problem. Can you give more details
about dbgrid geometry/dataset derivative, a backtrace?
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