PopupMenuItem Click和MouseOver之间的区别

type
  THackPopupList = class(TPopupList)
  private
    FActuallyClicked: Boolean;
  protected
    procedure WndProc(var Message: TMessage); override;
  public
    property ActuallyClicked: Boolean read FActuallyClicked;
  end;

{ THackPopupList }

procedure THackPopupList.WndProc(var Message: TMessage);
begin
  FActuallyClicked := Message.Msg = WM_COMMAND;
  inherited WndProc(Message);
end;

{ TForm1 }

procedure TForm1.MenuFileOpenClick(Sender: TObject);
var 
  ActuallyClicked: Boolean;
begin
  ActuallyClicked := THackPopupList(PopupList).ActuallyClicked;
  ...
end;

initialization
  PopupList.Free;
  PopupList := THackPopupList.Create;

end.

procedure TForm1.MenuFileOpenClick(Sender: TObject);
var
  ActuallyClicked: Boolean;
begin
  ActuallyCLicked := TMenuItem(Sender).Count = 0;
end;

procedure TForm1.FileOpenExecute(Sender: TObject);
var
  ActuallyClicked: Boolean;
begin
  if Sender is TBasicAction then
    Sender := TBasicAction(Sender).ActionComponent;
  ActuallyCLicked := TMenuItem(Sender).Count = 0;
end;