Qt How do I handle the event of the user pressing the X close button

Question

I am developing an application using Qt  I don t know which slot corresponds to the event of  the user clicking the  X  close  button of the window frame  i e  this button     If there isn t a slot for this  can anyone suggest me some other method by which I can start a function after the user presses that close button

User · Answer

You can attach a SLOT to the  void aboutToQuit      signal of your QApplication  This signal should be raised just before app closes

User · Answer

also you can reimplement protected member QWidget  closeEvent    void YourWidgetWithXButton  closeEvent QCloseEvent  event           do what you need here        then call parent s procedure     QWidget  closeEvent event

User · Answer

Well  I got it  One way is to override the QWidget  closeEvent QCloseEvent  event  method in your class definition and add your code into that function  Example   class foo   public QMainWindow       Q OBJECT private      void closeEvent QCloseEvent  bar                   void foo  closeEvent QCloseEvent  bar           Do something     bar- gt accept

User · Answer

If you have a QMainWindow you can override closeEvent method    include  lt QCloseEvent gt  void MainWindow  closeEvent  QCloseEvent  event        QMessageBox  StandardButton resBtn   QMessageBox  question  this  APP NAME                                                                  tr  Are you sure  n                                                                    QMessageBox  Cancel   QMessageBox  No   QMessageBox  Yes                                                                  QMessageBox  Yes       if  resBtn    QMessageBox  Yes            event- gt ignore          else           event- gt accept              If you re subclassing a QDialog  the closeEvent will not be called and so you have to override reject     void MyDialog  reject         QMessageBox  StandardButton resBtn   QMessageBox  Yes      if  changes            resBtn   QMessageBox  question  this  APP NAME                                          tr  Are you sure  n                                            QMessageBox  Cancel   QMessageBox  No   QMessageBox  Yes                                          QMessageBox  Yes             if  resBtn    QMessageBox  Yes            QDialog  reject

[c++] Qt: How do I handle the event of the user pressing the 'X' (close) button?

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