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QListWidget connect to QPushButton

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  • E Offline
    E Offline
    Eleonore
    wrote on last edited by
    #7

    Thanks, the idea is exactly that, just two details, in your code you use "ui" but we are not allowed to use QtDesigner so ui. And in your code the buttons and the QListWidget are in the same window, in mine I have two separate windows, the first and that of the products and the other that of QList.

    I shiw you my code (without the connection between my button and my QList) :

    panier.h (=cart.h in english) :

    #ifndef PANIER_H
    #define PANIER_H
    #include<QGridLayout>
    #include <QMainWindow>
    #include <QObject>
    #include <QWidget>
    #include<QPushButton>
    #include<QListWidget>

    class panier: public QWidget
    {
    Q_OBJECT

    public:
    explicit panier(QWidget*parent=0);
    signals:

    public slots :
    private :

    QPushButton*Payer;

    };

    #endif // PANIER_H

    panier.cpp :
    #include "panier.h"
    #include<QLabel>
    #include<QGridLayout>
    #include<QPushButton>

    panier::panier(QWidget * parent) :QWidget(parent)
    {
    QPixmap bkgnd(":/icones/photo/fond.jpg"); //associe l'image a la variable backgroung
    bkgnd = bkgnd.scaled(QSize(1366,768), Qt::IgnoreAspectRatio); // taille de l'image
    QPalette palette;
    palette.setBrush(QPalette::Window, bkgnd); //l'image devient le background
    this->setPalette(palette);

         QLabel* p= new QLabel(this); // création de la variable "logo"
         p->setPixmap(QPixmap(":/icones/photo/panier2.JPG")); // affichage de l'image logo a la place d'un texte
        p->move(100, 10); //Poisition de la photo
         QLabel *d1 = new QLabel(this);
             d1->setText("MON PANIER" ) ;
             d1->setFont(QFont("Segoe UI Semibold",14));
             d1->setStyleSheet("QLabel {color :white;}");
             d1->setGeometry(80,10,800,200);
    
             QLabel *d2 = new QLabel(this);
                 d2->setText("TOTAL :" ) ;
                 d2->setFont(QFont("Segoe UI Semibold",14));
                 d2->setStyleSheet("QLabel {color :white;}");
                 d2->setGeometry(10,500,800,200);
    
                 Payer = new QPushButton("PAYER",this);// nouveau bouton "Commander"
                 Payer-> setFont(QFont("Segoe UI Semibold",18));
                 Payer->setGeometry(QRect(0,635,300,60)); // géometrie du bouton
                 Payer->setStyleSheet("QPushButton { background-color: orange; color : dark; border: 3px solid black; }");
    
                 QListWidget*Liste_produits= new QListWidget(this);
                 QListWidgetItem *produits = new QListWidgetItem("LE BIG TASTY");
                 Liste_produits->addItem(produits);
                 Liste_produits->setGeometry(0,140,300,440);
    

    moment.h (=all my burger) :
    #ifndef MOMENT_H
    #define MOMENT_H
    #include<QWidget>
    #include<QPushButton>

    class moment : public QWidget
    {
    Q_OBJECT

    public:
    explicit moment(QWidget*parent=0);
    signals:

    public slots :
    private :
    QPushButtonTASTYO;
    QPushButton
    TASTYP;
    QPushButtonMAC;
    QPushButton
    FISH;
    QPushButtonWASABI;
    QPushButton
    RDELUXE;
    QPushButton*RCHEESE;
    };

    #endif // MOMENT_H

    and moment.cpp

    #include "moment.h"
    #include<QLabel>

    moment::moment(QWidget * parent) :QWidget(parent)
    {
    QPixmap bkgnd(":/icones/photo/fond.jpg"); //associe l'image a la variable backgroung
    bkgnd = bkgnd.scaled(QSize(1366,768), Qt::IgnoreAspectRatio); // taille de l'image
    QPalette palette;
    palette.setBrush(QPalette::Window, bkgnd); //l'image devient le background
    this->setPalette(palette);

         QLabel* p1= new QLabel(this); // création de la variable "logo"
         p1->setPixmap(QPixmap(":/icones/photo/bigtasty.png")); // affichage de l'image logo a la place d'un texte
         p1->move(60, 10); //Poisition de la photo
         QLabel *d1 = new QLabel(this);
             d1->setText("LE BIG TASTY" ) ;
             d1->setFont(QFont("Segoe UI Semibold",14));
             d1->setStyleSheet("QLabel {color :white;}");
             d1->setGeometry(85,40,800,200);
             QLabel *d1b = new QLabel(this);
                 d1b->setText("ORIGINALE");
                 d1b->setFont(QFont("Segoe UI Semibold",14));
                 d1b->setStyleSheet("QLabel {color :white;}");
                 d1b->setGeometry(90,60,800,200);
    
        QLabel* p2= new QLabel(this); // création de la variable "logo"
        p2->setPixmap(QPixmap(":/icones/photo/bigtastyc.png")); // affichage de l'image logo a la place d'un texte
        p2->move(340, 10); //Poisition de la photo
         QLabel *d2 = new QLabel(this);
             d2->setText("LE BIG TASTY ");
             d2->setFont(QFont("Segoe UI Semibold",14));
             d2->setStyleSheet("QLabel {color :white;}");
             d2->setGeometry(375,50,800,200);
             QLabel *d2b = new QLabel(this);
                 d2b->setText("POULET");
                 d2b->setFont(QFont("Segoe UI Semibold",14));
                 d2b->setStyleSheet("QLabel {color :white;}");
                 d2b->setGeometry(395,70,800,200);
    
         QLabel* p3= new QLabel(this); // création de la variable "logo"
         p3->setPixmap(QPixmap(":/icones/photo/fishw.png")); // affichage de l'image logo a la place d'un texte
         p3->move(600, 10); //Poisition de la photo
         QLabel *d3 = new QLabel(this);
             d3->setText("LE FISH " ) ;
             d3->setFont(QFont("Segoe UI Semibold",14));
             d3->setStyleSheet("QLabel {color :white;}");
             d3->setGeometry(655,40,800,200);
             QLabel *d3b = new QLabel(this);
                 d3b->setText("WASABI");
                 d3b->setFont(QFont("Segoe UI Semibold",14));
                 d3b->setStyleSheet("QLabel {color :white;}");
                 d3b->setGeometry(655,60,800,200);
    
         QLabel* p4= new QLabel(this); // création de la variable "logo"
         p4->setPixmap(QPixmap(":/icones/photo/wrapw.png")); // affichage de l'image logo a la place d'un texte
         p4->move(860, 10); //Poisition de la photo
         QLabel *d4 = new QLabel(this);
             d4->setText("  LE WRAP" ) ;
             d4->setFont(QFont("Segoe UI Semibold",14));
             d4->setStyleSheet("QLabel {color :white;}");
             d4->setGeometry(890,40,800,200);
             QLabel *d4b = new QLabel(this);
                 d4b->setText("TOKYO");
                 d4b->setFont(QFont("Segoe UI Semibold",14));
                 d4b->setStyleSheet("QLabel {color :white;}");
                 d4b->setGeometry(910,60,800,200);
    
    
         QLabel* p6= new QLabel(this); // création de la variable "logo"
         p6->setPixmap(QPixmap(":/icones/photo/royalc.png")); // affichage de l'image logo a la place d'un texte
         p6->move(60, 240); //Poisition de la photo
         QLabel *d6 = new QLabel(this);
             d6->setText("  LE ROYAL" ) ;
             d6->setFont(QFont("Segoe UI Semibold",14));
             d6->setStyleSheet("QLabel {color :white;}");
             d6->setGeometry(95,270,800,200);
    
         QLabel* p7= new QLabel(this); // création de la variable "logo"
         p7->setPixmap(QPixmap(":/icones/photo/royalcb.png")); // affichage de l'image logo a la place d'un texte
         p7->move(350, 240); //Poisition de la photo
    
         QLabel* p5= new QLabel(this); // création de la variable "logo"
         p5->setPixmap(QPixmap(":/icones/photo/royald.png")); // affichage de l'image logo a la place d'un texte
         p5->move(345, 240); //Poisition de la photo
         QLabel *d5 = new QLabel(this);
             d5->setText("  LE ROYAL" ) ;
             d5->setFont(QFont("Segoe UI Semibold",14));
             d5->setStyleSheet("QLabel {color :white;}");
             d5->setGeometry(375,270,800,200);
             QLabel *d5b = new QLabel(this);
                 d5b->setText("CHEESE                                           DELUXE");
                 d5b->setFont(QFont("Segoe UI Semibold",14));
                 d5b->setStyleSheet("QLabel {color :white;}");
                 d5b->setGeometry(110,290,800,200);
    
    
                 TASTYO = new QPushButton("6,20€",this);// nouveau bouton "Commander"
                 TASTYO-> setFont(QFont("Segoe UI Semibold",18));
                 TASTYO->setGeometry(QRect(95,180,100,40)); // géometrie du bouton
                 TASTYO->setStyleSheet("QPushButton { background-color: orange; color : dark; border: 3px solid black; }");
    
                 TASTYP = new QPushButton("6,20€",this);// nouveau bouton "Commander"
                 TASTYP-> setFont(QFont("Segoe UI Semibold",18));
                 TASTYP->setGeometry(QRect(385,180,100,40)); // géometrie du bouton
                 TASTYP->setStyleSheet("QPushButton { background-color: orange; color : dark; border: 3px solid black; }");
    
                 FISH = new QPushButton("4,80€",this);// nouveau bouton "Commander"
                 FISH-> setFont(QFont("Segoe UI Semibold",18));
                 FISH->setGeometry(QRect(640,180,100,40)); // géometrie du bouton
                 FISH->setStyleSheet("QPushButton { background-color: orange; color : dark; border: 3px solid black; }");
    
                 WASABI = new QPushButton("5,60€",this);// nouveau bouton "Commander"
                 WASABI-> setFont(QFont("Segoe UI Semibold",18));
                 WASABI->setGeometry(QRect(890,180,100,40)); // géometrie du bouton
                 WASABI->setStyleSheet("QPushButton { background-color: orange; color : dark; border: 3px solid black; }");
    
                 RCHEESE = new QPushButton("6,20€",this);// nouveau bouton "Commander"
                 RCHEESE-> setFont(QFont("Segoe UI Semibold",18));
                 RCHEESE->setGeometry(QRect(375,405,100,40)); // géometrie du bouton
                 RCHEESE->setStyleSheet("QPushButton { background-color: orange; color : dark; border: 3px solid black; }");
    
                 RDELUXE = new QPushButton("6,50€",this);// nouveau bouton "Commander"
                 RDELUXE-> setFont(QFont("Segoe UI Semibold",18));
                 RDELUXE->setGeometry(QRect(95,405,100,40)); // géometrie du bouton
                 RDELUXE->setStyleSheet("QPushButton { background-color: orange; color : dark; border: 3px solid black; }");
    

    }

    I hope you see the idea of my project a little better with the code.

    1 Reply Last reply
    1
    • mrjjM mrjj

      @Eleonore

      Hi
      Since I'm not sure where you get blocked.

      let's try to imagine we have this

      alt text

      we then connect all buttons to the same slot

      MainWindow::MainWindow(QWidget *parent)
          : QMainWindow(parent)
          , ui(new Ui::MainWindow)
      {
          ui->setupUi(this);
      
          // find all buttons and make list
          QList<QPushButton *> buttons = findChildren<QPushButton *>();
      
          //loop list and connect all buttons
          for (auto button  : buttons) {
           connect( button, &QPushButton::clicked, this, &MainWindow::ProductSelected);
          }
      }
      

      in the slot all buttons calls, we want to know which button for which we
      can use the sender() function for.

      void MainWindow::ProductSelected()
      {
         // sender returns Qwidget so we try to cast it to our buttons
          QPushButton *button = qobject_cast<QPushButton *> ( sender() );
          if (button) { // if its a button
             // add the buttons text to the listbox. you will ofc. want something else
              ui->listWidget->addItem( button->text() ) ;
          }
      }
      
      

      then we get
      alt text

      I hope it gives you an idea.

      else please show some code so we can find out what is not working for you.

      E Offline
      E Offline
      Eleonore
      wrote on last edited by Eleonore
      #8

      @mrjj
      p1.JPG p2.JPG image url)

      Here are the results of my interface with the code just above.
      and the goal is to create interactions, or when you press the different buttons with the prices, they are added to my cart on the left.

      JonBJ 1 Reply Last reply
      1
      • mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #9

        Hi
        Yes I understand much better now. +10 for the picture.

        There is no magic with UI files. its just code.
        So my ui->listWidget is just a pointer anyway.

        But you are right. being in different windows does change it a bit.

        You need a good place where both moment and panier is known.
        Often that is a place where you create both. maybe at start up

        so what i would do it to define a new signal in moment class

        public signals:
        void ProductSelected(QString name, QString price);
        
        and then also add a new slot.
        
        public slots:
        void ButtonProductClicked();
        

        then for all buttons, like
        TASTYO

        we connect it to our internal slot
        connect( TASTYO , &QPushButton::clicked, this, &moment::ButtonProductClicked);

        then in moment cpp

        void moment::ButtonProductClicked()
        {
           // sender returns Qwidget so we try to cast it to our buttons
            QPushButton *button = qobject_cast<QPushButton *> ( sender() );
            if (button) { 
               auto price = button->text();
               auto productname = ??? /// we kinda also need access to label to get product name, right ??
               emit  ProductSelected( productname , price); // send our new signal
            }
        }
        
        

        Then in panier you also add a matching slot

        public slots:
        void ProductSelected(QString name, QString price);
        

        and body in cpp where you just add to the listWidget

        Then somewhere you need to connect the moments new signal to the panier slot
        often it would be where you do
        new panier(this)
        if that place also knows the moment instance.

        then connect
        connect( momentPtr,&moment::ProductSelected, panierPtr, panier::ProductSelected );

        and then it should work.

        Pretty cool menu btw. Reminds me of MacDonalds :)

        E 1 Reply Last reply
        1
        • E Eleonore

          @mrjj
          p1.JPG p2.JPG image url)

          Here are the results of my interface with the code just above.
          and the goal is to create interactions, or when you press the different buttons with the prices, they are added to my cart on the left.

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #10

          @Eleonore
          I have not had a McD in > 1 year as a result of Covid. Your menu makes my mouth water ;-) What I find surprising/amusing are the French names like "Le Big Tasty Poulet". Nice to see you still protect your language and keep it intact :)

          1 Reply Last reply
          2
          • mrjjM mrjj

            Hi
            Yes I understand much better now. +10 for the picture.

            There is no magic with UI files. its just code.
            So my ui->listWidget is just a pointer anyway.

            But you are right. being in different windows does change it a bit.

            You need a good place where both moment and panier is known.
            Often that is a place where you create both. maybe at start up

            so what i would do it to define a new signal in moment class

            public signals:
            void ProductSelected(QString name, QString price);
            
            and then also add a new slot.
            
            public slots:
            void ButtonProductClicked();
            

            then for all buttons, like
            TASTYO

            we connect it to our internal slot
            connect( TASTYO , &QPushButton::clicked, this, &moment::ButtonProductClicked);

            then in moment cpp

            void moment::ButtonProductClicked()
            {
               // sender returns Qwidget so we try to cast it to our buttons
                QPushButton *button = qobject_cast<QPushButton *> ( sender() );
                if (button) { 
                   auto price = button->text();
                   auto productname = ??? /// we kinda also need access to label to get product name, right ??
                   emit  ProductSelected( productname , price); // send our new signal
                }
            }
            
            

            Then in panier you also add a matching slot

            public slots:
            void ProductSelected(QString name, QString price);
            

            and body in cpp where you just add to the listWidget

            Then somewhere you need to connect the moments new signal to the panier slot
            often it would be where you do
            new panier(this)
            if that place also knows the moment instance.

            then connect
            connect( momentPtr,&moment::ProductSelected, panierPtr, panier::ProductSelected );

            and then it should work.

            Pretty cool menu btw. Reminds me of MacDonalds :)

            E Offline
            E Offline
            Eleonore
            wrote on last edited by
            #11

            @mrjj
            For the productname, I used the same technique as for the buttons but with my QLabel. At the end, in panier.cpp, you use in connect, momentPtr and panierPtr, what is it and what does "ptr" mean?
            I don't understand what you mean bu new panier(this).
            Thank you and great if it looks like it since my goal is to remake their app

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

              @Eleonore said in QListWidget connect to QPushButton:
              Hi

              " connect, momentPtr and panierPtr, what is it and what does "ptr" mean?"

              Hi
              Ptr just means pointer. we need pointers to the classes to connect them.

              • new panier(this).

              Some place this window is created.
              like

              panier  *ThePanier = new panier(this).
              ThePanier ->show();
              

              or something like that.
              We can call it the creation place.
              and we need "ThePanier"

              the same goes for the moment class. we also need a pointer to an instance
              to connect.

              Well it looks good. Made me feel like eating one :)

              1 Reply Last reply
              0
              • E Offline
                E Offline
                Eleonore
                wrote on last edited by Eleonore
                #13

                @mrjj
                Hi, I tried doing it myself before asking you for help, my problem is connect( momentPtr,&moment::ProductSelected, panierPtr, panier::ProductSelected ); Qt doesn' recongnize momentPtr and panierPtr. I tried to pu something else instead but nothing works. I think that there is also a problem with my ProductSelected, wwhat I understand is that Qt says it's not defined.
                About the ThePanier ->show(); it's a little complicated because it's located in a function called "void opened order, void MainWindow::ouvrircommande()
                {
                com = new commander();
                com->show();
                com ->setFixedSize(1065,768);
                com->move(0,0);
                panier *pan = new panier;
                pan ->show();
                pan->setFixedSize(300,768);
                pan->move(1066,0);

                }
                This function is located in my mainwindow.cpp to open my two windows (the one with written our product and the card) at the same time.
                Thanks for your help and my hope my teacher will think the same thing as you about my interface.

                jsulmJ 1 Reply Last reply
                0
                • E Eleonore

                  @mrjj
                  Hi, I tried doing it myself before asking you for help, my problem is connect( momentPtr,&moment::ProductSelected, panierPtr, panier::ProductSelected ); Qt doesn' recongnize momentPtr and panierPtr. I tried to pu something else instead but nothing works. I think that there is also a problem with my ProductSelected, wwhat I understand is that Qt says it's not defined.
                  About the ThePanier ->show(); it's a little complicated because it's located in a function called "void opened order, void MainWindow::ouvrircommande()
                  {
                  com = new commander();
                  com->show();
                  com ->setFixedSize(1065,768);
                  com->move(0,0);
                  panier *pan = new panier;
                  pan ->show();
                  pan->setFixedSize(300,768);
                  pan->move(1066,0);

                  }
                  This function is located in my mainwindow.cpp to open my two windows (the one with written our product and the card) at the same time.
                  Thanks for your help and my hope my teacher will think the same thing as you about my interface.

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #14

                  @Eleonore said in QListWidget connect to QPushButton:

                  Qt doesn' recongnize momentPtr and panierPtr

                  Please post the relevant code and the while error message.

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

                  E 1 Reply Last reply
                  1
                  • jsulmJ jsulm

                    @Eleonore said in QListWidget connect to QPushButton:

                    Qt doesn' recongnize momentPtr and panierPtr

                    Please post the relevant code and the while error message.

                    E Offline
                    E Offline
                    Eleonore
                    wrote on last edited by
                    #15

                    @jsulm
                    my panier.cpp
                    12054e9d-3324-4aeb-a8b4-3bcdb4d44623-image.png

                    my panier.h
                    19249d30-f4c5-42e2-8672-1e85c8ddebc8-image.png

                    my commande.h
                    25d9ff7c-3d90-493e-90ae-d1dc6f7b64c5-image.png

                    my commande.cpp
                    ed387ef1-0360-42b0-ab69-daa52fdd8528-image.png

                    and my mainwindow.cpp
                    36779cc4-4d2c-4757-9909-664853ce27be-image.png

                    jsulmJ 1 Reply Last reply
                    0
                    • E Eleonore

                      @jsulm
                      my panier.cpp
                      12054e9d-3324-4aeb-a8b4-3bcdb4d44623-image.png

                      my panier.h
                      19249d30-f4c5-42e2-8672-1e85c8ddebc8-image.png

                      my commande.h
                      25d9ff7c-3d90-493e-90ae-d1dc6f7b64c5-image.png

                      my commande.cpp
                      ed387ef1-0360-42b0-ab69-daa52fdd8528-image.png

                      and my mainwindow.cpp
                      36779cc4-4d2c-4757-9909-664853ce27be-image.png

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #16

                      @Eleonore Next time please post text instead of screenshots.
                      I can't see where momentPtr and panierPtr are declared?

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

                      E 1 Reply Last reply
                      2
                      • jsulmJ jsulm

                        @Eleonore Next time please post text instead of screenshots.
                        I can't see where momentPtr and panierPtr are declared?

                        E Offline
                        E Offline
                        Eleonore
                        wrote on last edited by
                        #17

                        @jsulm
                        I didn't declare them because I'm not sure I understand what I should put at momentPtr, I don't know if I've already declared them under another name or if I have to declare something new. And if I have to declare, I don't know how and where to do it.

                        mrjjM 1 Reply Last reply
                        0
                        • E Eleonore

                          @jsulm
                          I didn't declare them because I'm not sure I understand what I should put at momentPtr, I don't know if I've already declared them under another name or if I have to declare something new. And if I have to declare, I don't know how and where to do it.

                          mrjjM Offline
                          mrjjM Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on last edited by
                          #18

                          @Eleonore

                          Hi. Good you tried first :)

                          Well those are just dummy names.

                          It just means a pointer to the class

                          so maybe here you have both ?

                          {
                          com = new commander(); <<< is this MOMENT class ? 
                          com->show();
                          com ->setFixedSize(1065,768);
                          com->move(0,0);
                          panier *pan = new panier; <<<< this is the panierPtr pointer
                          pan ->show();
                          pan->setFixedSize(300,768);
                          pan->move(1066,0);
                          
                          }
                          
                          E 1 Reply Last reply
                          0
                          • mrjjM mrjj

                            @Eleonore

                            Hi. Good you tried first :)

                            Well those are just dummy names.

                            It just means a pointer to the class

                            so maybe here you have both ?

                            {
                            com = new commander(); <<< is this MOMENT class ? 
                            com->show();
                            com ->setFixedSize(1065,768);
                            com->move(0,0);
                            panier *pan = new panier; <<<< this is the panierPtr pointer
                            pan ->show();
                            pan->setFixedSize(300,768);
                            pan->move(1066,0);
                            
                            }
                            
                            E Offline
                            E Offline
                            Eleonore
                            wrote on last edited by
                            #19

                            @mrjj
                            I kind of knew that it was the pointer, I arleady tried to replace it at that moment but it shows be an error message "use of undeaclared identifier "pan". I have this error message because this part of the code {
                            com = new commander(); <<< is this MOMENT class ?
                            com->show();
                            com ->setFixedSize(1065,768);
                            com->move(0,0);
                            panier *pan = new panier; <<<< this is the panierPtr pointer
                            pan ->show();
                            pan->setFixedSize(300,768);
                            pan->move(1066,0);

                            }

                            is in my main.cpp but this part of code connect( momentPtr,&moment::ProductSelected, panierPtr, panier::ProductSelected ); is in my panier.cpp.
                            And I don't think I created a pointer for my QPushbutton, I just named it button that I declared in my void moment::ButtonProductClicked().

                            mrjjM 1 Reply Last reply
                            0
                            • E Eleonore

                              @mrjj
                              I kind of knew that it was the pointer, I arleady tried to replace it at that moment but it shows be an error message "use of undeaclared identifier "pan". I have this error message because this part of the code {
                              com = new commander(); <<< is this MOMENT class ?
                              com->show();
                              com ->setFixedSize(1065,768);
                              com->move(0,0);
                              panier *pan = new panier; <<<< this is the panierPtr pointer
                              pan ->show();
                              pan->setFixedSize(300,768);
                              pan->move(1066,0);

                              }

                              is in my main.cpp but this part of code connect( momentPtr,&moment::ProductSelected, panierPtr, panier::ProductSelected ); is in my panier.cpp.
                              And I don't think I created a pointer for my QPushbutton, I just named it button that I declared in my void moment::ButtonProductClicked().

                              mrjjM Offline
                              mrjjM Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on last edited by
                              #20

                              @Eleonore
                              Hi
                              well we need both a panier pointer and a moment pointer to connect them.

                              its impossible to guess at when i dont have whole project.

                              so if you have the MOMNET pointer in panier it could work.

                              also do understand that if inside the panier , then you can use "this" in place of the pointer

                              Did you read this ?
                              https://doc.qt.io/qt-5/signalsandslots.html

                              Its not complicated but yo udo need a place where both classes are known to connect them.
                              That is often in MainWindow or some commen place.
                              Sometimes in main.cpp

                              But i cant say where to do it as i dont know where you NEW a moment instance.

                              also i guess that
                              com = new commander();
                              is another class. so you dont seem to make a MOMENT in main.cpp so it has to be some other place

                              1 Reply Last reply
                              2
                              • E Offline
                                E Offline
                                Eleonore
                                wrote on last edited by
                                #21

                                @mrjj
                                Thanks a lot for your help. Unfortunately, after all of this help I still can't create this interraction. I have to hand in my project tonight so I'll just explain that I couldn' t do this part. I hope this conversation can help others in the future.
                                Thanks a lot!

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