Hello!

I have a doubt that is not truuuly problematic, but nevertheless would certainly increase my knowledge in programming and make a code of some of my softwares better.

The idea that I have in mind (and I do have a code that makes that work) is that sometimes I want a window (QDialog, normally) to appear before the actual software is shown, or else I want a window (QDialog) to appear where the user will select between a number of MainWindows to use. The first case has a very common example: imagine a software that all times, before it runs, shows a QDialog for the user to put a password in order to use this software. For the second case, here is the code that I'm using to make that work: (since both codes are very similar, I'm gonna show just this second):

Qt Code: 
  1. int decisao;
  2. bool continuaounao = false;
  3.  
  4. int main(int argc, char *argv[])
  5. {
  6.     QApplication a(argc, argv);
  7.  
  8.     NovoMain NM;
  9.  
  10. inicio: decisao = NM.executa();
  11.         if (decisao == 1)   //Positions
  12.             goto spositions;
  13.         else if (decisao == 2)  //Body
  14.                 goto body;
  15.         else if (decisao == 3)  //Outro
  16.                 goto context;
  17.         else if (decisao == 4)  //Creditos
  18.                 goto creditos;
  19.         else if (decisao == 0)
  20.             return 0;
  21.  
  22. spositions: {
  23.                 qDebug() << "Positions";
  24.                 SPositions sp;
  25.                 sp.setWindowTitle("Positions");
  26.                 sp.showMaximized();
  27.                 sp.show();
  28.                 a.exec();
  29.                 if (sp.getSaida() == true)
  30.                     return 0;
  31.                 else goto inicio;
  32.             }
  33.  
  34. body:       {
  35.                 Body bd;
  36.                 bd.setWindowTitle("Body knowledge");
  37.                 bd.showMaximized();
  38.                 bd.show();
  39.                 a.exec();
  40.                 if (bd.getSaida() == true)
  41.                     return 0;
  42.                 else goto inicio;
  43.             }
  44. context:    {
  45.                 Context ct;
  46.                 ct.setWindowTitle("Context and details");
  47.                 ct.showMaximized();
  48.                 ct.show();
  49.                 a.exec();
  50.                 if (ct.getSaida() == true)
  51.                     return 0;
  52.                 else goto inicio;
  53.             }
  54. creditos:   {
  55.                 Credits cd;
  56.                 cd.setWindowTitle("Credits");
  57.                 cd.showMaximized();
  58.                 cd.show();
  59.                 qDebug() << "Credits";
  60.                 a.exec();
  61.                 if (cd.getSaida() == true)
  62.                     return 0;
  63.                 else goto inicio;
  64.             }
  65. }
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A example of the basic code used in the getSaida() function (the same for all of them):

Qt Code: 
  1. Context::Context(QWidget *parent) :
  2.     QMainWindow(parent),
  3.     ui(new Ui::Context)
  4. {
  5.     ui->setupUi(this);
  6.     continua = false;
  7. }
  8.  
  9. Context::~Context()
  10. {
  11.     delete ui;
  12. }
  13.  
  14. void Context::on_actionClose_triggered()
  15. {
  16.     close();
  17. }
  18.  
  19. void Context::on_actionExit_triggered()
  20. {
  21.     continua = true;
  22.     close();
  23. }
  24.  
  25. bool Context::getSaida()
  26. {
  27.     return continua;
  28. }
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Note: the NovoMain is a QDialog with a respective QPushButton for each of the possible MainWindow in the code (SPosition, Body, etc.) and, when one of the QPushButton is clicked, it closes the QDialog and return a specific int catch by "decisao".

My question is: is there a better way to do this? Is there a function or something like that that can replace my goto methodology??



Thanks!

Momergil