TRichView.com

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function IsPlainText(rv: TCustomRichView): Boolean;
var
  i, StyleNo, StyleNo2, ParaNo: Integer;
  s: TRVUnicodeString;
begin
  // if empty, then returning True
  if rv.ItemCount = 0 then
  begin
    Result := True;
    exit;
  end;
  Result := False;
  // checking for a background bitmap  
  if (rv.BackgroundStyle<>bsNoBitmap) and not rv.BackgroundBitmap.Empty then
    exit;
  // finding the starting text and paragraph styles
  StyleNo := rv.GetItemStyle(0);
  if StyleNo = rvsTab then
    StyleNo := TRVTabItemInfo(rv.GetItem(0)).TextStyleNo;
  if StyleNo < 0 then
    exit;
  ParaNo := rv.GetItemPara(0);
  for i := 0 to rv.ItemCount - 1 do
  begin
    // checking paragraph
    if rv.GetItemPara(i) <> ParaNo then
      exit;
    // checking checkpoints, tags, tooltips
    if (rv.GetItemCheckpoint(i) <> nil) or (rv.GetItemTag(i) <> '') then
      exit;
    rv.GetItemExtraStrProperty(i, rvespHint, s);
    if s <> '' then
      exit;
    // checking text style
    StyleNo2 := rv.GetItemStyle(i);
    if StyleNo2 = rvsTab then
      StyleNo2 := TRVTabItemInfo(rv.GetItem(i)).TextStyleNo;
    if StyleNo <> StyleNo2 then
      exit;
  end;
  Result := True;
end;