[Lazarus] DBGrid.OnDrawColumnCell

[matt shaffer]

I thought I'd just throw this out there:
I'm still having issues with CPU usage and my customized grid. How often is
prepare canvas called? I would think only when the form would be moving or
otherwise need moving, but I suspect it's being called constantly. The grid
is quite customized, changing alignment for most cells, checking the strings
of every single cell and changing their fonts and backgrounds accordingly..
I'll throw in the code if anyone's interested.

On Thu, Sep 17, 2009 at 6:08 AM, Luca Olivetti <luca at wetron.es> wrote:

> En/na Andrea Mauri ha escrit:
>
>> Dear all,
>> in my application I need to change the cell color of some cells in a
>> DBGrid.
>> I use the OnDrawColumnCell event. My DBGrid name is dbgLoadings here the
>> OnDrawColumnCell event:
>>
>> procedure TfrmPCA.dbgLoadingsDrawColumnCell(Sender: TObject; const Rect:
>> TRect;
>>  DataCol: Integer; Column: TColumn; State: TGridDrawState);
>> begin
>>  if DataCol >= 2 then
>>  begin
>>    dbgLoadings.Canvas.Font.Color:= clWhite;
>>    dbgLoadings.Canvas.Brush.Color:= clRed;
>>  end;
>>  if DataCol >= 2 then
>>   dbgLoadings.DefaultDrawColumnCell
>>     (Rect, DataCol, Column, State);
>> end;
>>
>> It does not work. The Font appears fuzzy coloured like if the white font
>> is written upon the original balck one. And the foreground of the cell
>> remain white.
>>
>> Any hint?
>> Regards,
>> Andrea
>>
>
> I leave DefaultDrawing to true and use the OnPrepareCanvas event to do
> that.
> See also
> http://wiki.freepascal.org/Grids_Reference_Page
>
>
> Bye
> --
> Luca Olivetti
> Wetron Automatización S.A. http://www.wetron.es/
> Tel. +34 93 5883004 (Ext.133)  Fax +34 93 5883007
>
>
> --
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