Question and Answer Database
FAQ2434D.txt Custom InPlace Editor in StringGrid
Category :VCL
Platform :All
Product :Delphi 3.x
Question:
How can I popup my own inplace editor (such as a combobox)
in a string grid cell?
Answer:
The following example demonstrates popping up a Combobox
as an inplace editor to a Stringrid component.
Example:
procedure TForm1.FormCreate(Sender: TObject);
begin
{The combobox height is not settable, so we will}
{instead size the grid to fit the combobox!}
StringGrid1.DefaultRowHeight := ComboBox1.Height;
{Hide the combobox}
ComboBox1.Visible := False;
end;
procedure TForm1.ComboBox1Change(Sender: TObject);
begin
{Get the ComboBox selection and place in the grid}
StringGrid1.Cells[StringGrid1.Col,
StringGrid1.Row] :=
ComboBox1.Items[ComboBox1.ItemIndex];
ComboBox1.Visible := False;
StringGrid1.SetFocus;
end;
procedure TForm1.ComboBox1Exit(Sender: TObject);
begin
{Get the ComboBox selection and place in the grid}
StringGrid1.Cells[StringGrid1.Col,
StringGrid1.Row] :=
ComboBox1.Items[ComboBox1.ItemIndex];
ComboBox1.Visible := False;
StringGrid1.SetFocus;
end;
procedure TForm1.StringGrid1SelectCell(Sender: TObject; Col,
Row: Integer; var CanSelect: Boolean);
var
R: TRect;
begin
if ((Col = 3) AND
(Row <> 0)) then begin
{Size and position the combo box to fit the cell}
R := StringGrid1.CellRect(Col, Row);
R.Left := R.Left + StringGrid1.Left;
R.Right := R.Right + StringGrid1.Left;
R.Top := R.Top + StringGrid1.Top;
R.Bottom := R.Bottom + StringGrid1.Top;
ComboBox1.Left := R.Left + 1;
ComboBox1.Top := R.Top + 1;
ComboBox1.Width := (R.Right + 1) — R.Left;
ComboBox1.Height := (R.Bottom + 1) — R.Top;
{Show the combobox}
ComboBox1.Visible := True;
ComboBox1.SetFocus;
end;
CanSelect := True;
end;
7/16/98 4:31:28 PM
Last Modified: 01-SEP-99