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unit ExPopupMenu;

interface

uses Controls, Menus;

const
    CM_MENU_CLOSED = CM_BASE + 1001;
    CM_ENTER_MENU_LOOP = CM_BASE + 1002;
    CM_EXIT_MENU_LOOP = CM_BASE + 1003;

var
  FPopupMenu: TPopupMenu;

function GetCurrentPopupMenu: TPopupMenu;
procedure SetCurrentPopupMenu(const PopupMenu: TPopupMenu);

implementation

uses Messages, Forms;

type
    TPopupListEx = class(TPopupList)
    protected
      procedure WndProc(var Message: TMessage) ; override;
    private
      procedure PerformMessage(cm_msg : integer; msg : TMessage) ;
    end;

{ TPopupListEx }
procedure TPopupListEx.PerformMessage(cm_msg: integer; msg : TMessage) ;
begin
    if not (Screen.Activeform  = nil) then
      Screen.ActiveForm.Perform(cm_msg,
        (*Integer(PChar(Screen.ActiveForm.PopupMenu)),*)  //<- Ist nicht zugewiesen und daher nicht verwendbar!
        msg.WParam, msg.LParam) ;
end;

procedure TPopupListEx.WndProc(var Message: TMessage) ;
begin
    case message.Msg of
      WM_ENTERMENULOOP: PerformMessage(CM_ENTER_MENU_LOOP, Message) ;
      WM_EXITMENULOOP : PerformMessage(CM_EXIT_MENU_LOOP, Message) ;
      WM_MENUSELECT :
      with TWMMenuSelect(Message) do
      begin
        if (Menu = 0) and (Menuflag = $FFFF) then
        begin
          PerformMessage(CM_MENU_CLOSED, Message) ;
        end;
      end;
    end;
    inherited;
end;

function GetCurrentPopupMenu: TPopupMenu;
begin
  Result := FPopupMenu;
end;

procedure SetCurrentPopupMenu(const PopupMenu: TPopupMenu);
begin
  FPopupMenu := PopupMenu;
end;

initialization
    FPopupMenu := TPopupMenu.Create(nil);

    Popuplist.Free; //free the "default", "old" list
    PopupList:= TPopupListEx.Create; //create the new one
    // The new PopupList will be freed by
    // finalization section of Menus unit.

finalization
  if Assigned(FPopupMenu) then
    FPopupMenu := nil;  //<- Hier führt .Free zu einem Laufzeitfehler: "Runtime error 217 at 00409495"

end.					

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procedure TForm1.PopupMenu1Popup(Sender: TObject);
begin
  SetCurrentPopupMenu(TPopupMenu(Sender));
end;

//Hier kann man nun mehrere PopupMenus unterscheiden:
procedure TForm1.PopupMenuClosed(var msg: TMessage) ;
begin
  if GetCurrentPopupMenu = PopupMenu1 then
    Showmessage('PopMenu closed');
end;

procedure TForm1.PopupMenuEnter(var msg: TMessage) ;
begin
  if GetCurrentPopupMenu = PopupMenu1 then
    Showmessage('PopMenu entered');
end;

procedure TForm1.PopupMenuExit(var msg: TMessage) ;
begin
  if GetCurrentPopupMenu = PopupMenu1 then
    Showmessage('PopMenu exited');
end;