Returning from Dialog

[wysota]

In my code i have never called hide(), or Delete() for any dialog or widgets. the dialog disappears after event on OK/Cancel button.

So how come when you launch a dialog, the main window disappears?

Maybe it would be best if you provided a minimal compilable example reproducing the problem?

This code seems to work fine:

#include <QtWidgets>
 
class MainWindow : public QMainWindow {
  Q_OBJECT
public:
  MainWindow() {
    QPushButton *pb = new QPushButton("Press");
    setCentralWidget(pb);
    connect(pb, SIGNAL(clicked()), this, SLOT(showDialog()));
 
  }
public slots:
  void showDialog() {
    QDialog dlg;
    QPushButton *pb = new QPushButton("Show another dialog");
    QVBoxLayout *l = new QVBoxLayout(&dlg);
    l->addWidget(pb);
    connect(pb, SIGNAL(clicked()), this, SLOT(showDialog2()));
    dlg.exec();
  }
  void showDialog2() {
    QDialog dlg;
    QPushButton *pb = new QPushButton("Close");
    QVBoxLayout *l = new QVBoxLayout(&dlg);
    l->addWidget(pb);
    connect(pb, SIGNAL(clicked()), &dlg, SLOT(accept()));
    dlg.exec();
  }
};
 
#include "main.moc"
 
int main(int argc, char **argv) {
  QApplication app(argc, argv);
  MainWindow mw;
  mw.show();
  app.exec();
}

#include <QtWidgets>

class MainWindow : public QMainWindow {
  Q_OBJECT
public:
  MainWindow() {
    QPushButton *pb = new QPushButton("Press");
    setCentralWidget(pb);
    connect(pb, SIGNAL(clicked()), this, SLOT(showDialog()));
    
  }
public slots:
  void showDialog() {
    QDialog dlg;
    QPushButton *pb = new QPushButton("Show another dialog");
    QVBoxLayout *l = new QVBoxLayout(&dlg);
    l->addWidget(pb);
    connect(pb, SIGNAL(clicked()), this, SLOT(showDialog2()));
    dlg.exec();
  }
  void showDialog2() {
    QDialog dlg;
    QPushButton *pb = new QPushButton("Close");
    QVBoxLayout *l = new QVBoxLayout(&dlg);
    l->addWidget(pb);
    connect(pb, SIGNAL(clicked()), &dlg, SLOT(accept()));
    dlg.exec();
  }
};

#include "main.moc"

int main(int argc, char **argv) {
  QApplication app(argc, argv);
  MainWindow mw;
  mw.show();
  app.exec();
}

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