delphi – 如何检测弹出菜单子菜单的弹出窗口(以及如何动态填充

一些关于动态添加和删除项目的演示代码：

procedure TForm1.FormCreate(Sender: TObject);
var
  Popup: TPopupMenu;
  Item,SubItem: TMenuItem;
begin
  Popup := TPopupMenu.Create(Self);
  PopupMenu := Popup;
  Item := TMenuItem.Create(Popup);
  Item.Caption := 'Test submenu';
  Item.OnClick := PopupClick;
  Popup.Items.Add(Item);

  SubItem := TMenuItem.Create(Item);
  SubItem.Caption := 'dummy';
  Item.Add(SubItem);
end;

procedure TForm1.PopupClick(Sender: TObject);
var
  SubmenuItem,Item: TMenuItem;
begin
  SubmenuItem := Sender as TMenuItem;
  // delete old items (leave at least one to keep the submenu)
  while SubmenuItem.Count > 1 do
    SubmenuItem.Items[SubmenuItem.Count - 1].Free;
  // create new items
  while SubmenuItem.Count < 3 do begin
    Item := TMenuItem.Create(SubmenuItem);
    Item.Caption := Format('new item created %d',[GetTickCount]);
    SubmenuItem.Add(Item);
  end;
end;