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QPlainTextEdit::QCloseEvent

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  • M Mehodin

    Hello,

    I'm trying to connect the QCloseEvent signal to a function of mine.

    connect(configText, &QPlainTextEdit::closeEvent, this, &Firefly::clearSubMenus);
    

    Where configText is a QPlainTextEdit

    The error im getting is:

    'QWidget::closeEvent': cannot access protected member declared in class QWidget

    How do i get around this, because this HAS to be possible.

    Thanks in advance!

    aha_1980A Offline
    aha_1980A Offline
    aha_1980
    Lifetime Qt Champion
    wrote on last edited by aha_1980
    #2

    Hi @Mehodin

    one way to get access to protected members is to use subclassing. There you have full access.

    Edit: closeEvent is no signal, it's a virtual function you can override. the link provides an example.

    Regards

    Qt has to stay free or it will die.

    1 Reply Last reply
    4
    • mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #3

      Hi
      One note.
      Are you using configText as a window ?
      If not, im not sure closeEvent Will be triggered unless you call
      QWidget::close() yourself.
      If configText is a widget inside a form, should you not hook up to the forms
      close event ?

      1 Reply Last reply
      2
      • M Offline
        M Offline
        Mehodin
        wrote on last edited by
        #4

        well, I am using configText as a separate window using configText->show().
        So it's a separate window.

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        0
        • M Offline
          M Offline
          Mehodin
          wrote on last edited by
          #5

          @mrjj do you maybe know a different way to just clear() it when it closes?

          mrjjM 1 Reply Last reply
          0
          • M Mehodin

            @mrjj do you maybe know a different way to just clear() it when it closes?

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #6

            @Mehodin
            Hi
            When its a window, then close Event seems pretty appropriate if you want to perform
            some task when extra floating window is closed.

            1 Reply Last reply
            1
            • M Offline
              M Offline
              Mehodin
              wrote on last edited by
              #7

              @mrjj yeah but it's not a real QWindow, it's just a widget that's floating.

              mrjjM 1 Reply Last reply
              0
              • M Mehodin

                @mrjj yeah but it's not a real QWindow, it's just a widget that's floating.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #8

                @Mehodin
                Hi
                Well any widget, you dont give a parent, will set the Be a Window flags and
                act like a window with border etc. So using closeEvent seems fine
                to do some last call clean up when its closed.
                Only downside is that you have to subclass QPlainTextEdit to have access to it.

                But since you want to call something in Firefly , you might want to do something like

                #ifndef MYPLAINTEXT_H
                #define MYPLAINTEXT_H
                
                #include <QPlainTextEdit>
                
                class MyPlainText : public QPlainTextEdit
                {
                    Q_OBJECT
                public:
                    explicit MyPlainText(QWidget *parent = nullptr) : QPlainTextEdit(parent) {}
                signals:
                    void Closing(); // define new signal
                
                protected:
                    virtual void closeEvent(QCloseEvent *event) override
                    {
                        emit Closing(); // send signal before closing.
                        QPlainTextEdit::closeEvent(event);
                    }
                };
                
                #endif // MYPLAINTEXT_H
                

                and hook the new signal Closing to Firefly::clearSubMenus
                from outside. That way, MyPlainText dont need any access to Firefly.

                1 Reply Last reply
                4
                • M Offline
                  M Offline
                  Mehodin
                  wrote on last edited by
                  #9

                  @mrjj

                  0_1550599921743_d9a3530b-c89c-4b14-b500-562040496230-afbeelding.png

                  That's somehow giving me a lot of errors though when using it.

                  1 Reply Last reply
                  0
                  • mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by mrjj
                    #10

                    Hi
                    Hmm. compiles here.
                    How did you use it ?
                    should be placed in its own .h file and included in the project.
                    Then you hook up new signal and show the widget.

                    void MainWindow::on_pushButton_clicked()
                    {
                        auto *win = new MyPlainText();
                        win->setAttribute(Qt::WA_DeleteOnClose);
                        connect(win, &MyPlainText::Closing, this, []() {
                            qDebug() << "win is closing";
                        });
                    
                        win->show();
                    }
                    
                    

                    test project
                    https://www.dropbox.com/s/hg8xz8uour34cc8/untitled79.zip?dl=0

                    1 Reply Last reply
                    0
                    • M Offline
                      M Offline
                      Mehodin
                      wrote on last edited by
                      #11

                      #ifndef MYPLAINTEXT_H
                      #define MYPLAINTEXT_H

                      #include <QPlainTextEdit>

                      class textWindow : public QPlainTextEdit
                      {
                      Q_OBJECT
                      public:
                      explicit textWindow(QWidget *parent = nullptr) : QPlainTextEdit(parent) {}
                      signals:
                      void Closing(); // define new signal

                      protected:
                      virtual void closeEvent(QCloseEvent *event) override
                      {
                      emit Closing(); // send signal before closing.
                      QPlainTextEdit::closeEvent(event);
                      }
                      };
                      #endif

                      in a .h file

                      proxyText = new textWindow();
                      configText = new textWindow();
                      comboText = new textWindow();
                      connect(proxyText, &textWindow::Closing, this, &Firefly::clearSubMenus);
                      //connect(configText, &textWindow::Closing, this, &Firefly::clearSubMenus);
                      //connect(comboText, &textWindow::Closing, this, &Firefly::clearSubMenus);
                      

                      in firefly.cpp

                      @mrjj

                      1 Reply Last reply
                      0
                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #12

                        Hi,

                        What does clearSubMenus look like ?

                        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
                        0
                        • M Offline
                          M Offline
                          Mehodin
                          wrote on last edited by
                          #13

                          @SGaist

                          The 3 text edits ->clear(); (on phone right now)

                          1 Reply Last reply
                          0
                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #14

                            I meant it signature.

                            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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