Deleting checked item from CheckListBox

Question

I'd like to delete checked items from CheckListBox by cliicking TButton but I've found only how to delete selected item and it's not what I'm looking for. I hope you can help me

Answer 1

if i understand what you need, try following code:

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
  count : Integer;
begin
  i:= 0;
  count :=   CheckListBox1.Items.Count - 1;
  while i <= count  do
       if CheckListBox1.Checked[i] = true then
       begin
               CheckListBox1.Items.Delete(i);
               count := count - 1;
       end else i:=i+1;
end;

Of curse, there are better solutions, but it is ready to use for you.

Answer 2

This code will do what you want. Note that CheckBoxList1.Items.Count is decreasing by one every time an item is deleted. For this reason we're using downto instead of do in the for-loop.

procedure TForm1.Button1Click(Sender: TObject);
var
  index: Integer;
begin
  CheckListBox1.Items.BeginUpdate;
  try
    for index := (CheckListBox1.Items.Count - 1) downto 0 do
      if (CheckListBox1.Checked[index]) then
        CheckListBox1.Items.Delete(index);
  finally
    CheckListBox1.Items.EndUpdate;
  end;
end;

The CheckListBox1.Items.BeginUpdate; and CheckListBox1.Items.EndUpdate; statements ensure that the control doesn't repaint itself while we're processing its items.