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Forum Update on Monday, May 27th 2025

Check if button was right clicked or left clicked?

Scheduled Pinned Locked Moved Solved General and Desktop
right-clickbuttonqmouseevent
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  • mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #5

    Hi
    For your use case, you could add new signal to
    your derived QPushButton to allow it to emit
    rightclicked() and connect to that new signal outside
    to handle when its right-clicked.

    Note: its pretty uncommon to right click buttons in terms
    of user experience.

    1 Reply Last reply
    4
    • L Offline
      L Offline
      legitnameyo
      wrote on last edited by
      #6

      When I try to add the QPushButton mouseEventPress() function into my code and redefine it it gives this error

      member access into incomplete type 'QAbstractButtonPrivate'
      
      1 Reply Last reply
      0
      • Christian EhrlicherC Offline
        Christian EhrlicherC Offline
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on last edited by
        #7

        You should not add the code from QAbstractButton::mousePressEvent() - you should override the function. This is basic c++ knowledge explained e.g. here: https://www.programiz.com/cpp-programming/function-overriding

        Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
        Visit the Qt Academy at https://academy.qt.io/catalog

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        3
        • L Offline
          L Offline
          legitnameyo
          wrote on last edited by
          #8

          All I get when I try to override the function is

          non-friend class member 'mouseEventPress' cannot have a qualified name
          
          mrjjM 1 Reply Last reply
          0
          • L legitnameyo

            All I get when I try to override the function is

            non-friend class member 'mouseEventPress' cannot have a qualified name
            
            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #9

            @legitnameyo
            show the code :)

            1 Reply Last reply
            0
            • L Offline
              L Offline
              legitnameyo
              wrote on last edited by
              #10
              class Derived: public QPushButton {
              public:
                  QPushButton A;
                  QAbstractButton B(Derived);
                  QAbstractButton::mouseMoveEvent(QMouseEvent *e); // Error
              
                  void QAbstractButton::mousePressEvent(QMouseEvent *e) // Error
                  {
                      Q_D(QAbstractButton);
                      if (e->button() != Qt::LeftButton) {
                          e->ignore();
                          return;
                      }
                      if (hitButton(e->pos())) {
                          setDown(true);
                          d->pressed = true;
                          repaint();
                          d->emitPressed();
                          e->accept();
                      } else {
                          e->ignore();
                      }
                  }
              };
              
              
              KillerSmathK 1 Reply Last reply
              0
              • L legitnameyo
                class Derived: public QPushButton {
                public:
                    QPushButton A;
                    QAbstractButton B(Derived);
                    QAbstractButton::mouseMoveEvent(QMouseEvent *e); // Error
                
                    void QAbstractButton::mousePressEvent(QMouseEvent *e) // Error
                    {
                        Q_D(QAbstractButton);
                        if (e->button() != Qt::LeftButton) {
                            e->ignore();
                            return;
                        }
                        if (hitButton(e->pos())) {
                            setDown(true);
                            d->pressed = true;
                            repaint();
                            d->emitPressed();
                            e->accept();
                        } else {
                            e->ignore();
                        }
                    }
                };
                
                
                KillerSmathK Offline
                KillerSmathK Offline
                KillerSmath
                wrote on last edited by KillerSmath
                #11

                @legitnameyo
                You cannot define a qualifier in declaration of a member method.

                class Derived : public QPushButton{
                public:
                  //void QPushButton::mousePressEvent(QMouseEvent *e); // wrong
                  void mousePressEvent(QMouseEvent *e); // right
                };
                

                Further, you should to define the construtor method of your class.
                Note: The construtor method is a function without return value and with same name of class.

                class Derived : public QPushButton{
                public:
                   Derived(); // construtor
                }
                

                To accept signals and slot feature, you need to declare the Q_OBJECT inside your class.

                class Derived : QPushButton{
                   Q_OBJECT
                ...
                };
                

                Below is an example code of how you should reimplement it using @mrjj idea.

                class CustomPushButton : public QPushButton
                {
                    Q_OBJECT
                public:
                    CustomPushButton(QWidget *parent = nullptr);
                
                protected:
                   void	mousePressEvent(QMouseEvent *e) override;
                   void mouseReleaseEvent(QMouseEvent *e) override;
                
                signals:
                    void leftClicked();
                    void rightClicked();
                };
                

                Now, you need to reimplement the mousePressedEvent and mouseReleaseEvent(if necessary) logic on your .cpp file

                @Computer Science Student - Brazil
                Web Developer and Researcher
                “Sometimes it’s the people no one imagines anything of who do the things that no one can imagine.” - Alan Turing

                1 Reply Last reply
                5
                • L Offline
                  L Offline
                  legitnameyo
                  wrote on last edited by
                  #12

                  all I get from that class is

                  :-1: error: symbol(s) not found for architecture x86_64
                  :-1: error: linker command failed with exit code 1 (use -v to see invocation)
                  
                  1 Reply Last reply
                  0
                  • Christian EhrlicherC Offline
                    Christian EhrlicherC Offline
                    Christian Ehrlicher
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    @legitnameyo said in Check if button was right clicked or left clicked?:

                    all I get from that class is

                    This is no class, this is a class definition. You have to fill out the functions by yourself with the code you want to have - we won't write you your code...

                    Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
                    Visit the Qt Academy at https://academy.qt.io/catalog

                    1 Reply Last reply
                    2
                    • L Offline
                      L Offline
                      legitnameyo
                      wrote on last edited by
                      #14

                      I can't write out the functions since everything I want to override or change in QPushButton::mousePressEvent is private.

                      1 Reply Last reply
                      0
                      • L Offline
                        L Offline
                        legitnameyo
                        wrote on last edited by
                        #15

                        Solved it by creating a derivative of the CustomQPushButton class definition! Thanks!

                        1 Reply Last reply
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