FireMonkey ListView 自动计算行高

说明：展示 ListView 视其每一行 Item 的 Detail 字串长度自动调整高度（可每行高度不同）。

适用：Delphi XE7 / XE8

源码下载：[原创]ListView_自动计算行高(by龟山阿卍).zip

procedure TForm1.Button1Click(Sender: TObject);
const DetailStr: array[..] of String =
(''
,'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz'
,'ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ'
);
var i, r: Integer;
    Item1: TListViewItem;
begin
     for i:= to  do
     begin
          Item1 := ListView1.Items.Add;
          r := Random();
          Item1.Detail := DetailStr[r].Substring(, Random(DetailStr[r].Length));
          Item1.Text := i.ToString;
     end;
end;

procedure TForm1.ListView1UpdateObjects(const Sender: TObject;
  const AItem: TListViewItem);
var R: TRectF;
begin
     if (AItem.Objects.DetailObject <> nil) and
        (AItem.Objects.DetailObject.Text <> '') then
     begin
          // 计算文字显示的区域
          R := RectF(, , AItem.Objects.DetailObject.Width, );
          ListView1.Canvas.MeasureText(R,
            AItem.Objects.DetailObject.Text,
            AItem.Objects.DetailObject.WordWrap,
            [], TTextAlign.Leading, TTextAlign.Leading);

          // 设定高度
          AItem.Height := Trunc(R.Height);
     end;
end;

补充：计算最后一项区域并卷到最后一项

procedure TForm1.Button2Click(Sender: TObject);
var R: TRectF;
begin
     R := ListView1.GetItemRect(ListView1.Items.Count - ); // 取得最后一项的真实区域 (不等高也能计算)
     ListView1.ScrollViewPos := R.Bottom; // 卷到最后
end;