HideScrollBars (Delphi)

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Description

This example requires: TRichEdit, TRadioGroup, TCheckBox, and TButton. Clicking the Radio Group control sets the ScrollBar style of the RichEdit. Toggling the Check Box turns HideScrollBars on and off. Clicking the button loads the Rich Edit with a large amount of contiguous text.

Code

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
begin
  RichEdit1.Lines.Clear;
  for I := 0 to 500 do
  begin
    RichEdit1.Text :=
      RichEdit1.Text + 'test line ' + IntToStr(I) + ' ';
    if (i mod 4 = 0) then
      RichEdit1.Text := RichEdit1.Text + Chr(13);
  end;
  // Move caret to the top of the edit box.
  RichEdit1.SelStart := 0; 
end;

procedure TForm1.CheckBox1Click(Sender: TObject);
begin
  RichEdit1.HideScrollbars := CheckBox1.Checked;
end;

procedure TForm1.RadioGroup1Click(Sender: TObject);
const
  ScrollBarA: array[0..3] of TScrollStyle = (
    ssBoth,
    ssHorizontal,
    ssNone,
    ssVertical);
begin
  RichEdit1.ScrollBars := 
    ScrollBarA[RadioGroup1.ItemIndex];
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  with RadioGroup1, Items do
  begin
    Caption := 'Scroll Bars';
    Clear;
    Add('ssBoth');
    Add('ssHorizontal');
    Add('ssNone');
    Add('ssVertical');
  end;
  with CheckBox1 do
  begin
    Caption := 'HideScrollBars';
    Checked := True;
  end;
  Button1.Caption := 'Loaded';
  RichEdit1.Text := 'Just a little text.';
  RichEdit1.WordWrap := False;
end;

Uses

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