Problem closing QDialog based tool style application



  • My application uses QDialog as the base class instead of QMainWindow and I set the Qt::Tool window flag. Now when I click on the close window button the window disappears but the program is still running. Now I can only quit by control click on the dock icon or through the screen menu bar.

    I tried setting QApplication::setQuitOnLastWindowClosed(true), I tried calling QDialog::accept() on the closeEvent.

    I want the program to quit when the window is closed. It seems a bit rude to call exit() in the close event.

    On Mac, the default style is that applications don't close when the last window closes but I don't want that here.

    System: OSX 10.11, Qt 5.7.1


  • Lifetime Qt Champion

    Hi,

    Can you show a minimal sample code that shows that behaviour ?



  • Minimal example follows...

    dialogtool.pro:

    QT       += core gui
    CONFIG   += qt c++11 warn_all
    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
    TARGET   = DialogTool
    TEMPLATE = app
    SOURCES += main.cc dialogtool.cc
    HEADERS += dialogtool.h
    

    main.cc:

    #include <QApplication>
    #include "dialogtool.h"
    
    int main(int argc, char *argv[])
    {
      QApplication a(argc, argv);
      a.setQuitOnLastWindowClosed(true);
      DialogTool w;
      w.show();
    
      return a.exec();
    }
    

    dialogtool.h:

    #ifndef dt_h
    #define dt_h
    
    #include <QDialog>
    
    class DialogTool : public QDialog
    {
      Q_OBJECT
    public:
      DialogTool();
      ~DialogTool();
    };
    
    #endif
    

    dialogtool.cc:

    #include "dialogtool.h"
    
    DialogTool::DialogTool() : QDialog(nullptr, Qt::Tool) { }
    DialogTool::~DialogTool() { }
    

  • Lifetime Qt Champion

    I can confirm the behaviour. However it indeed does look a bit strange. I'd recommend checking the but report system to see if there's anything related.


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