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SDL_EnableKeyRepeat(0, 0);
event.key.keysym.sym := 0;
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procedure MenuSystem;
var
  menu: integer;
begin
  while (SDL_WaitEvent(@event) >= 0) do
  begin
    case event.type_ of
      SDL_QUITEV: //ÕâÀï´¦Àí´°¿ÚÍ˳öʼþ
        if messagebox(0, 'Are you sure to quit?', 'KYS Windows', MB_OKCANCEL) = IDOK then Quit;
      SDL_KEYUP:
        begin
          if (event.key.keysym.sym = sdlk_down) then
          begin
            menu := menu+1;
            if menu > 3 then menu := 0; //°´ÏÂϼüµÄÒç³ö
            showMenusystem(menu); //ÿ´Îµ±Ç°Ñ¡Öз¢Éú±ä»¯Ê±, ¾ùÖØ»­Ñ¡µ¥
          end;
          if (event.key.keysym.sym = sdlk_up) then
          begin
           


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