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Forum Update on Monday, May 27th 2025

QStackedWidget setCurrentIndex slot not showing on Signals&Slots editor (QtCreator)

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qstackedwidgetqtcreatorsignal & slotslot
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  • mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #3

    hi
    the
    void setCurrentIndex(int index)
    wants an int to tell which page to show.
    The button clicked() or released() signal does not have
    int as a parameter so you cannot hook that signal to that slot as there
    is no way the button can send the index.

    However, the button can call a normal slot in main and
    there you can call setCurrentIndex with a index.

    1 Reply Last reply
    1
    • SGaistS SGaist

      Hi,

      How do you want to do that from a button ?

      cxamC Offline
      cxamC Offline
      cxam
      wrote on last edited by
      #4

      @SGaist you could imagine it as a setup wizard more or less, with 'next' or 'back' buttons

      mrjjM 1 Reply Last reply
      0
      • cxamC cxam

        @SGaist you could imagine it as a setup wizard more or less, with 'next' or 'back' buttons

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #5

        @cxam
        just to be sure, u did see
        http://doc.qt.io/qt-5/qwizard.html
        which is for wizard type of interface.

        cxamC 1 Reply Last reply
        0
        • mrjjM mrjj

          @cxam
          just to be sure, u did see
          http://doc.qt.io/qt-5/qwizard.html
          which is for wizard type of interface.

          cxamC Offline
          cxamC Offline
          cxam
          wrote on last edited by
          #6

          @mrjj said:

          http://doc.qt.io/qt-5/qwizard.html

          I said Setup Wizard as an example, what I exactly want is a main menu from where you can go to different interfaces, so I need buttons to go through pages. (This app is going to be running on a Raspberry Pi 2 using EGLFS)

          1 Reply Last reply
          0
          • mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #7

            ok
            QStackedWidget seems right for a multipage application.

            cxamC 2 Replies Last reply
            0
            • mrjjM mrjj

              ok
              QStackedWidget seems right for a multipage application.

              cxamC Offline
              cxamC Offline
              cxam
              wrote on last edited by
              #8

              @mrjj So what I did so far is that when I clic the button it declares an int with the index number, now I could set the variable I declared as the index for my QStackedWidget right ?

              1 Reply Last reply
              0
              • mrjjM mrjj

                ok
                QStackedWidget seems right for a multipage application.

                cxamC Offline
                cxamC Offline
                cxam
                wrote on last edited by
                #9

                @mrjj More or less like this:

                
                void MainWindow::on_Cambio1_clicked()
                {
                    int cambio1;
                    cambio1 = 0;
                    void QStackedWidget::setCurrentIndex(cambio1);
                }
                

                I don't know why but it comes up with this error:

                error: invalid use of qualified-name 'QStackedWidget::setCurrentIndex'
                     int QStackedWidget::setCurrentIndex(cambio1);
                                                                ^
                
                mrjjM 1 Reply Last reply
                0
                • cxamC cxam

                  @mrjj More or less like this:

                  
                  void MainWindow::on_Cambio1_clicked()
                  {
                      int cambio1;
                      cambio1 = 0;
                      void QStackedWidget::setCurrentIndex(cambio1);
                  }
                  

                  I don't know why but it comes up with this error:

                  error: invalid use of qualified-name 'QStackedWidget::setCurrentIndex'
                       int QStackedWidget::setCurrentIndex(cambio1);
                                                                  ^
                  
                  mrjjM Offline
                  mrjjM Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on last edited by mrjj
                  #10

                  @cxam
                  well i would expect something like
                  void MainWindow::on_Cambio1_clicked()
                  {
                  // int cambio1; <<< move to mainwinow.h in the class so all buttons have access to this "current-page"
                  cambio1++; // take next page//
                  ui->YourQStackedWidget->setCurrentIndex(cambio1);
                  }
                  set cambio1= 0 in mainwin constructor

                  A more clean way might be to use to functions
                  nextPage() and prevPage() in mainwindow
                  and the buttons just call that and it does the page switch back and forth.

                  please try this sample
                  https://www.dropbox.com/s/hpjtrr1xvo3lakw/stackedinteface.zip?dl=0

                  cxamC 1 Reply Last reply
                  2
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #11

                    The error comes from the fact that your are trying to call a class method like it's a static method.

                    Even if you don't use QWizard, you can take a look at its implementation to get started.

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

                    cxamC 1 Reply Last reply
                    2
                    • SGaistS SGaist

                      The error comes from the fact that your are trying to call a class method like it's a static method.

                      Even if you don't use QWizard, you can take a look at its implementation to get started.

                      cxamC Offline
                      cxamC Offline
                      cxam
                      wrote on last edited by
                      #12

                      @SGaist @mrjj thank you very much for your help, I'll try that out and see how it goes.
                      Regards

                      mrjjM 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        @cxam
                        well i would expect something like
                        void MainWindow::on_Cambio1_clicked()
                        {
                        // int cambio1; <<< move to mainwinow.h in the class so all buttons have access to this "current-page"
                        cambio1++; // take next page//
                        ui->YourQStackedWidget->setCurrentIndex(cambio1);
                        }
                        set cambio1= 0 in mainwin constructor

                        A more clean way might be to use to functions
                        nextPage() and prevPage() in mainwindow
                        and the buttons just call that and it does the page switch back and forth.

                        please try this sample
                        https://www.dropbox.com/s/hpjtrr1xvo3lakw/stackedinteface.zip?dl=0

                        cxamC Offline
                        cxamC Offline
                        cxam
                        wrote on last edited by
                        #13
                        This post is deleted!
                        1 Reply Last reply
                        0
                        • cxamC cxam

                          @SGaist @mrjj thank you very much for your help, I'll try that out and see how it goes.
                          Regards

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #14

                          @cxam
                          Yes, u can have buttons inside the pages if you want.
                          Works the same.

                          cxamC 1 Reply Last reply
                          1
                          • mrjjM mrjj

                            @cxam
                            Yes, u can have buttons inside the pages if you want.
                            Works the same.

                            cxamC Offline
                            cxamC Offline
                            cxam
                            wrote on last edited by
                            #15

                            @mrjj Hi! I managed to make everything just as I wanted, everything is going fine. The code example you sent me really did the trick. Thanks a lot.

                            1 Reply Last reply
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