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Trying to use closeEvent on MainWindow if user press X

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  • D DouglinhasZN

    How I am using it? Im guessing you'd like the snippets for my code?

    import sys
    
    from PyQt5 import QtCore, QtGui, QtWidgets
    from PyQt5.QtWidgets import QMessageBox
    import urllib3
    from urllib.request import urlopen
    from bs4 import BeautifulSoup
    from urllib.parse import urlparse
    urllib3.disable_warnings()
    
    
    class Ui_Proofo(object):
        def setupUi(self, Proofo):
        {Here is the UI, so all my labels, buttons, boxes etc.}
        def retranslateUi(self, Proofo):
    
    if __name__ == "__main__":
        import sys
        app = QtWidgets.QApplication(sys.argv)
        Proofo = QtWidgets.QMainWindow()
        ui = Ui_Proofo()
        ui.setupUi(Proofo)
        Proofo.show()
        sys.exit(app.exec_())
    
    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by jsulm
    #12

    @DouglinhasZN You should do it like described in the link above: create another class (call it for example MainWindow) and load your Ui_Proofo there as UI and then implement the close event in MainWindow.

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    1 Reply Last reply
    0
    • D Offline
      D Offline
      DouglinhasZN
      wrote on last edited by DouglinhasZN
      #13

      Thank you @jsulm , I gave it a go:

      from CVE_Design import Ui_Proofo
      class MainWindow(QWidget):
          def __init__(self):
              super(MainWindow, self).__init__()
              self.ui = Ui_Proofo() # Here you use the class from designer to create the UI
              self.ui.setupUi(self)
          def closeEvent(self, event):
                      close = QMessageBox.question(self, "QUIT", "Are you sure want to stop process?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
                      if close == QMessageBox.Yes:
                          event.accept()
                      else:
                          event.ignore()
      

      However, nothing seems to happen. I apologise if I seem to be overcomplicating it, but I really am clueless now.

      JonBJ 1 Reply Last reply
      0
      • D DouglinhasZN

        Thank you @jsulm , I gave it a go:

        from CVE_Design import Ui_Proofo
        class MainWindow(QWidget):
            def __init__(self):
                super(MainWindow, self).__init__()
                self.ui = Ui_Proofo() # Here you use the class from designer to create the UI
                self.ui.setupUi(self)
            def closeEvent(self, event):
                        close = QMessageBox.question(self, "QUIT", "Are you sure want to stop process?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
                        if close == QMessageBox.Yes:
                            event.accept()
                        else:
                            event.ignore()
        

        However, nothing seems to happen. I apologise if I seem to be overcomplicating it, but I really am clueless now.

        JonBJ Online
        JonBJ Online
        JonB
        wrote on last edited by
        #14

        @DouglinhasZN said in Trying to use closeEvent on MainWindow if user press X:

        However, nothing seems to happen.

        What does this mean? You get no UI appear when you run the program, MainWindow.__init__() is not called, , or you don't get the close message box when you try to close the widget? Do yourself a favor and at least put in a couple of print() statements so you know what is being executed.

        1 Reply Last reply
        2
        • D Offline
          D Offline
          DouglinhasZN
          wrote on last edited by
          #15

          @JonB I had some print statement, but they dont get printed. The code itself don't seem to run. When I close the application, nothing happens, it just closes as it normally would

          JonBJ 1 Reply Last reply
          0
          • D DouglinhasZN

            @JonB I had some print statement, but they dont get printed. The code itself don't seem to run. When I close the application, nothing happens, it just closes as it normally would

            JonBJ Online
            JonBJ Online
            JonB
            wrote on last edited by
            #16

            @DouglinhasZN
            Nothing shown in your post above is going to run if you never create an instance of MainWindow. You only show that fragment of your code, not where you create it from, so who knows.

            D 1 Reply Last reply
            1
            • D Offline
              D Offline
              DouglinhasZN
              wrote on last edited by
              #17

              @JonB said in Trying to use closeEvent on MainWindow if user press X:

              your post above is going to run if you never create an instance of MainWindow.

              What do you mean where I create it from?
              @JonB

              1 Reply Last reply
              0
              • JonBJ JonB

                @DouglinhasZN
                Nothing shown in your post above is going to run if you never create an instance of MainWindow. You only show that fragment of your code, not where you create it from, so who knows.

                D Offline
                D Offline
                DouglinhasZN
                wrote on last edited by
                #18

                @JonB I see where you are coming from, you mean adding the following under: if name == "main":

                w = MainWindow()
                w.setupUi(MainWindow)
                

                ?
                I have tried that and indeed it does work, but it creates a new application. In that application it does everything I want it to, but its not my main one

                JonBJ Cobra91151C 2 Replies Last reply
                0
                • D DouglinhasZN

                  @JonB I see where you are coming from, you mean adding the following under: if name == "main":

                  w = MainWindow()
                  w.setupUi(MainWindow)
                  

                  ?
                  I have tried that and indeed it does work, but it creates a new application. In that application it does everything I want it to, but its not my main one

                  JonBJ Online
                  JonBJ Online
                  JonB
                  wrote on last edited by JonB
                  #19

                  @DouglinhasZN
                  I'm sorry, I really don't understand. There is no "new application"! I suspect you mean a new, separate window, which is kind of what I was wondering....

                  We have seen your latest class MainWindow(QWidget): definition. Can you now paste the whole of your code from

                  if __name__ == "__main__":
                  

                  downward and then we might see what is going on. The trouble is we keep seeing snippets....

                  D 1 Reply Last reply
                  0
                  • D DouglinhasZN

                    @JonB I see where you are coming from, you mean adding the following under: if name == "main":

                    w = MainWindow()
                    w.setupUi(MainWindow)
                    

                    ?
                    I have tried that and indeed it does work, but it creates a new application. In that application it does everything I want it to, but its not my main one

                    Cobra91151C Offline
                    Cobra91151C Offline
                    Cobra91151
                    wrote on last edited by Cobra91151
                    #20

                    @DouglinhasZN

                    Hello!

                    You can try my code, it should intercept the close event:

                    class UI_MainWindow(QMainWindow):
                        def __init__(self):
                            super(UI_MainWindow, self).__init__()
                            print("Initialization succeeded")
                    
                        def closeEvent(self, event):
                            print("closeEvent has been called")
                            userResult = QMessageBox.question(None, "Quit", "Do you want to close the program?", QMessageBox.Yes, QMessageBox.No)
                    
                            if userResult == QMessageBox.Yes:
                                event.accept()
                            else:
                                event.ignore()
                    
                    1 Reply Last reply
                    0
                    • JonBJ JonB

                      @DouglinhasZN
                      I'm sorry, I really don't understand. There is no "new application"! I suspect you mean a new, separate window, which is kind of what I was wondering....

                      We have seen your latest class MainWindow(QWidget): definition. Can you now paste the whole of your code from

                      if __name__ == "__main__":
                      

                      downward and then we might see what is going on. The trouble is we keep seeing snippets....

                      D Offline
                      D Offline
                      DouglinhasZN
                      wrote on last edited by
                      #21

                      @JonB I see, I have posted the whole of my code up in the thread, but here it is:

                      import sys
                      
                      from PyQt5 import QtCore, QtGui, QtWidgets
                      from PyQt5.QtWidgets import QMessageBox
                      import urllib3
                      from urllib.request import urlopen
                      from bs4 import BeautifulSoup
                      from urllib.parse import urlparse
                      urllib3.disable_warnings()
                      
                      
                      class Ui_Proofo(object):
                          def setupUi(self, Proofo):
                          {Here is the UI, so all my labels, buttons, boxes etc.}
                          def retranslateUi(self, Proofo):
                      
                      from CVE_Design import Ui_Proofo
                      class MainWindow(QWidget):
                          def __init__(self):
                              super(MainWindow, self).__init__()
                              self.ui = Ui_Proofo()
                              self.ui.setupUi(self)
                      
                          def closeEvent(self, event):
                                      close = QMessageBox.question(self, "QUIT", "Are you sure want to stop process?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
                                      print("okay this is done 2")
                                      if close == QMessageBox.Yes:
                                          print("okay this is done 3")
                                          event.accept()
                                      else:
                                          event.ignore()
                      
                      if __name__ == "__main__":
                          import sys
                          app = QtWidgets.QApplication(sys.argv)
                          Proofo = QtWidgets.QMainWindow()
                          ui = Ui_Proofo()
                          ui.setupUi(Proofo)
                          Proofo.show()
                          sys.exit(app.exec_())
                      
                      Cobra91151C JonBJ 2 Replies Last reply
                      0
                      • D DouglinhasZN

                        @JonB I see, I have posted the whole of my code up in the thread, but here it is:

                        import sys
                        
                        from PyQt5 import QtCore, QtGui, QtWidgets
                        from PyQt5.QtWidgets import QMessageBox
                        import urllib3
                        from urllib.request import urlopen
                        from bs4 import BeautifulSoup
                        from urllib.parse import urlparse
                        urllib3.disable_warnings()
                        
                        
                        class Ui_Proofo(object):
                            def setupUi(self, Proofo):
                            {Here is the UI, so all my labels, buttons, boxes etc.}
                            def retranslateUi(self, Proofo):
                        
                        from CVE_Design import Ui_Proofo
                        class MainWindow(QWidget):
                            def __init__(self):
                                super(MainWindow, self).__init__()
                                self.ui = Ui_Proofo()
                                self.ui.setupUi(self)
                        
                            def closeEvent(self, event):
                                        close = QMessageBox.question(self, "QUIT", "Are you sure want to stop process?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
                                        print("okay this is done 2")
                                        if close == QMessageBox.Yes:
                                            print("okay this is done 3")
                                            event.accept()
                                        else:
                                            event.ignore()
                        
                        if __name__ == "__main__":
                            import sys
                            app = QtWidgets.QApplication(sys.argv)
                            Proofo = QtWidgets.QMainWindow()
                            ui = Ui_Proofo()
                            ui.setupUi(Proofo)
                            Proofo.show()
                            sys.exit(app.exec_())
                        
                        Cobra91151C Offline
                        Cobra91151C Offline
                        Cobra91151
                        wrote on last edited by
                        #22

                        @DouglinhasZN

                        So, what happens when you press X on the MainWindow?

                        D 1 Reply Last reply
                        0
                        • D DouglinhasZN

                          @JonB I see, I have posted the whole of my code up in the thread, but here it is:

                          import sys
                          
                          from PyQt5 import QtCore, QtGui, QtWidgets
                          from PyQt5.QtWidgets import QMessageBox
                          import urllib3
                          from urllib.request import urlopen
                          from bs4 import BeautifulSoup
                          from urllib.parse import urlparse
                          urllib3.disable_warnings()
                          
                          
                          class Ui_Proofo(object):
                              def setupUi(self, Proofo):
                              {Here is the UI, so all my labels, buttons, boxes etc.}
                              def retranslateUi(self, Proofo):
                          
                          from CVE_Design import Ui_Proofo
                          class MainWindow(QWidget):
                              def __init__(self):
                                  super(MainWindow, self).__init__()
                                  self.ui = Ui_Proofo()
                                  self.ui.setupUi(self)
                          
                              def closeEvent(self, event):
                                          close = QMessageBox.question(self, "QUIT", "Are you sure want to stop process?", QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
                                          print("okay this is done 2")
                                          if close == QMessageBox.Yes:
                                              print("okay this is done 3")
                                              event.accept()
                                          else:
                                              event.ignore()
                          
                          if __name__ == "__main__":
                              import sys
                              app = QtWidgets.QApplication(sys.argv)
                              Proofo = QtWidgets.QMainWindow()
                              ui = Ui_Proofo()
                              ui.setupUi(Proofo)
                              Proofo.show()
                              sys.exit(app.exec_())
                          
                          JonBJ Online
                          JonBJ Online
                          JonB
                          wrote on last edited by JonB
                          #23

                          @DouglinhasZN
                          You have written a new class MainWindow with the closeEvent() in it, but you never create/use MainWindow anywhere in your code, do you? That's why it has no effect.

                          Proofo = QtWidgets.QMainWindow() still creates it as QMainWindow. You need to create it as a MainWindow to use the code shown.

                          Sorry, I haven't any more time right now, hopefully someone will show what you're supposed to do. Hopefully it's just

                          Proofo = MainWindow()
                          

                          And I think you want to get rid of your

                              ui = Ui_Proofo()
                              ui.setupUi(Proofo)
                          

                          because MainWindow.__init__() is doing that bit. So:

                          if __name__ == "__main__":
                              import sys
                              app = QtWidgets.QApplication(sys.argv)
                              Proofo = MainWindow()
                              Proofo.show()
                              sys.exit(app.exec_())
                          
                          1 Reply Last reply
                          1
                          • Cobra91151C Cobra91151

                            @DouglinhasZN

                            So, what happens when you press X on the MainWindow?

                            D Offline
                            D Offline
                            DouglinhasZN
                            wrote on last edited by
                            #24

                            @Cobra91151 Nothing happens, its almost as if its not linking that class to the overall GUI.
                            Instead, if I add

                            w = MainWindow()
                            w.setupUi(MainWindow)
                            

                            Then it will load up a new window as well as the main window. On that new window, the code will work fine

                            @JonB I hear what you're saying, I had similar code to what you've suggested but I ran with your suggestion and it opens up a new blank window rather than my Ui from Qt Designer (Proofo)

                            SGaistS 1 Reply Last reply
                            0
                            • D DouglinhasZN

                              @Cobra91151 Nothing happens, its almost as if its not linking that class to the overall GUI.
                              Instead, if I add

                              w = MainWindow()
                              w.setupUi(MainWindow)
                              

                              Then it will load up a new window as well as the main window. On that new window, the code will work fine

                              @JonB I hear what you're saying, I had similar code to what you've suggested but I ran with your suggestion and it opens up a new blank window rather than my Ui from Qt Designer (Proofo)

                              SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #25

                              @DouglinhasZN said in Trying to use closeEvent on MainWindow if user press X:

                              w = MainWindow()
                              w.setupUi(MainWindow)

                              That code does not make sense.

                              Straight from the documentation I linked:

                              import sys
                              from PyQt5.QtWidgets import QApplication, QDialog
                              from ui_imagedialog import Ui_ImageDialog << The file generated from your .ui file
                              
                              app = QApplication(sys.argv)
                              window = QDialog() << a widget
                              ui = Ui_ImageDialog() << instance of the generated class
                              ui.setupUi(window) << the parameter of setupUi must be an instance of a QWidget based class. In this case QDialog.
                              
                              window.show()
                              sys.exit(app.exec_())
                              

                              Interested in AI ? www.idiap.ch
                              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                              1 Reply Last reply
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