TAdvStringGrid

Example 62 : Checkbox based disjunct row selection

With this sample project, it is demonstrated how the checkboxes can be used to perform a disjunct row selection in the grid. This is done by adding a column of checkboxes in the grid and from the checkbox click event control the disjunct row selection state of the rows clicked.

The grid is initialized with the code:

var
  i: integer;
begin
  advstringgrid1.FixedCols := 0;
  advstringgrid1.ColWidths[0] := 20;
  advstringgrid1.Options := advstringgrid1.Options + [goRowSelect, goEditing];
  advstringgrid1.RowCount := 20;
  advstringgrid1.ShowSelection := false;
  for i := 1 to advstringgrid1.RowCount -1 do
    advstringgrid1.AddCheckBox(0,i,false,false);
  advstringgrid1.RandomFill(false,100);
end;

This code adds a checkbox in the first column for every row in the grid.

To let the row selection state reflect the checkbox state, the OnCheckBoxClick is implemented as:

procedure TForm1.AdvStringGrid1CheckBoxClick(Sender: TObject; ACol,
  ARow: Integer; State: Boolean);
begin
  advstringgrid1.RowSelect[Arow] := State;
end;

Finally, to obtain all selected rows and possibly perform some processing on these rows, this is done with:

var
  i: Integer;
  state: boolean;
begin
  Listbox1.Items.Clear;

  for i := 1 to AdvStringGrid1.RowCount - 1 do
  begin
    if Advstringgrid1.GetCheckBoxState(0,i,state) then
    begin
      if state then
      begin
        AdvStringGrid1.SetCheckBoxState(0,i,false);
        ListBox1.Items.Add(AdvStringgrid1.Cells[1,i]);
      end;
    end;
  end;
  if listbox1.Items.Count = 0 then
    ShowMessage('No items selected');
  AdvStringGrid1.Invalidate;
end;

Delphi project & source files for downloading included in the main demos distribution for Delphi.

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TAdvStringGrid

Example 62 : Checkbox based disjunct row selection