Hmmm, I managed to get a bit further: now I can let a grid draw nothing in a memo cell - just can't it to draw the proper text.
I'm using this OnDrawColumnCell event procedure in the dbgrid to try and show memo fields:
(updated 16 September with new code)
procedure TForm1.ResultsGridDrawColumnCell(Sender: TObject; const Rect: TRect;
DataCol: Integer; Column: TColumn; State: TGridDrawState);
// Draw memo text instead of (Memo)
// Note: grid DefaultDrawing property must be off to avoid duplicate drawing
// To get this, I basically copied the existing DefaultDrawColumnCell procedure
// but tested for memo first. If no memo, pass on to default procedure.
// Maybe slower, more complicated, but it allows for changes in the
// core Lazarus DefaultDrawColumnCell procedure.
var
OverrideDraw: boolean; //determine if we're going to override drawing
S: string;
F: TField;
DataRow: Integer;
begin
OverrideDraw:=false;
try
F := Column.Field;
if F.DataType = ftMemo then
begin
OverRideDraw:=true;
end;
except
on E: exception do
begin
// We might have an inactive datalink or whatever,
// in that case, pass on our problems to the existing
// procedure.
//showMessage('Exception: ' + E.Classname + '/' + E.Message);
OverRideDraw:=false;
end;
end;
if OverRideDraw=false then
begin
// Call normal procedure to handle drawing for us.
ResultsGrid.DefaultDrawColumnCell(Rect,DataCol,Column,State);
end
else
begin
// Get to work displaying our memo contents
// Basically shamelessly ripped from
// DefaultDrawColumnCell
// maybe fix something for first/header row
if F<>nil then
begin
//DO display memo ;)
S := F.AsString; //DisplayText will only show (Memo)
end
else
begin
S := '';
end;
//Actual drawing, taken from Grids.DrawCellText coding:
ResultsGrid.Canvas.TextRect(Rect,Left,Top, S);
end;
end;
Attached:
- project source code (hint: when started, load db2secout.txt, then press export)
- screenshot of the problem.
Thanks for any help!