Delphi：Listview中的Shift-Up和Shift-Down

Listview控件中是否有一项功能可以上下移动项目？ 我没有很好地使用TListView(我主要使用数据库网格),我把你的问题作为学习的机会.以下代码是结果,大卫的答案更具视觉导向性.它有一些限制：它只会移动第一个选定的项目,当它移动项目时,vsicon和vsSmallIcon的显示在移动后很奇怪.

procedure TForm1.btnDownClick(Sender: TObject);
var
  Index: integer;
  temp : TListItem;
begin
  // use a button that cannot get focus, such as TSpeedButton
  if ListView1.Focused then
    if ListView1.SelCount>0 then
    begin
      Index := ListView1.Selected.Index;
      if Index<ListView1.Items.Count then
      begin
        temp := ListView1.Items.Insert(Index+2);
        temp.Assign(ListView1.Items.Item[Index]);
        ListView1.Items.Delete(Index);
        // fix display so moved item is selected/focused
        ListView1.Selected := temp;
        ListView1.ItemFocused := temp;
      end;
    end;
end;

procedure TForm1.btnUpClick(Sender: TObject);
var
  Index: integer;
  temp : TListItem;
begin
  // use a button that cannot get focus, such as TSpeedButton
  if ListView1.Focused then
    if ListView1.SelCount>0 then
    begin
      Index := ListView1.Selected.Index;
      if Index>0 then
      begin
        temp := ListView1.Items.Insert(Index-1);
        temp.Assign(ListView1.Items.Item[Index+1]);
        ListView1.Items.Delete(Index+1);
        // fix display so moved item is selected/focused
        ListView1.Selected := temp;
        ListView1.ItemFocused := temp;
      end;
    end;
end;