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QGroupBox, QScrollArea, QFormLayout

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  • SPlattenS SPlatten

    @JonB , thank you, however its missing the QFormLayout which is required, see my post before you post.

    Edited code, still doesn't work.

        //Create container for errors panel
            mpobjErrors = new QWidget(this);
            mpvbloErrors = new QVBoxLayout;
            mpobjErrors->setLayout(mpvbloErrors);
        //Create scroll area
            mpsaErrors = new QScrollArea(mpobjErrors);
        //Create a widget that contains the scrollable errors form
            QWidget* pobjFormErrorsContr(new QWidget(mpsaErrors));
        //Set-up scroll area
            mpsaErrors->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
            int intFixedHeight(fontMetrics().height() * MainWindow::mscuintErrorRows);
            mpsaErrors->setWidget(pobjFormErrorsContr);
            mpsaErrors->setFixedHeight(intFixedHeight);
            mpsaErrors->setWidgetResizable(true);
            mpfrmloErrors = new QFormLayout(pobjFormErrorsContr);
            mpvbloErrors->addWidget(pobjFormErrorsContr, 1, Qt::AlignHCenter);//addLayout(mpfrmloErrors, 1);//
        //Create a push button for acknowledging and clearing errors panel
            QPushButton* pbtnAck(new QPushButton(tr("&Clear Errors")));
            mpvbloErrors->addWidget(pbtnAck, 1, Qt::AlignHCenter);
            QObject::connect(pbtnAck, &QPushButton::clicked,
                [this, pbtnAck]
                {
                    mpobjErrors->setVisible(false);
                }
            );
    
    JonBJ Online
    JonBJ Online
    JonB
    wrote on last edited by
    #29

    @SPlatten
    I found I had to put in scrollArea.setWidgetResizable(true); to make it respect the height. You are saying it still does not. I assume you have verified the value for fontMetrics().height() * MainWindow::mscuintErrorRows. You can put a QFormLayout into my sample code in place of QVBoxLayout layout;, I can't see why that would behave any differently vertically.

    SPlattenS 1 Reply Last reply
    0
    • JonBJ JonB

      @SPlatten
      I found I had to put in scrollArea.setWidgetResizable(true); to make it respect the height. You are saying it still does not. I assume you have verified the value for fontMetrics().height() * MainWindow::mscuintErrorRows. You can put a QFormLayout into my sample code in place of QVBoxLayout layout;, I can't see why that would behave any differently vertically.

      SPlattenS Offline
      SPlattenS Offline
      SPlatten
      wrote on last edited by SPlatten
      #30

      @JonB , just to verify:

      int intFontHeight(fontMetrics().height()),
          intFixedHeight(intFontHeight * MainWindow::mscuintErrorRows);
      

      intFontHeight is 13
      MainWindow::mscuintErrorRows is 3
      intFixedHeight is 39

      Clearly setFixedHeight on mpsaErrors is not having the desired effect.

      Kind Regards,
      Sy

      1 Reply Last reply
      0
      • M Offline
        M Offline
        mpergand
        wrote on last edited by mpergand
        #31

        Assuming margins at set to zero:

        pFormLayout=new QFormLayout;
        pFormLayout->setContentsMargins(0,0,0,0);
        pFormLayout->setSpacing(0);
        pFormLayout->setHorizontalSpacing(10);
        

        In the show event you can calculate 3 rows height like that:

        void Widget::showEvent(QShowEvent* event)
        {
            QWidget::showEvent(event);
            QLayoutItem * item=pFormLayout-> itemAt(0);
            int h=item->geometry().height();
        
            pScrollArea->setFixedHeight(h*3+2);
        
        }
        

        SPlattenS 1 Reply Last reply
        2
        • M mpergand

          Assuming margins at set to zero:

          pFormLayout=new QFormLayout;
          pFormLayout->setContentsMargins(0,0,0,0);
          pFormLayout->setSpacing(0);
          pFormLayout->setHorizontalSpacing(10);
          

          In the show event you can calculate 3 rows height like that:

          void Widget::showEvent(QShowEvent* event)
          {
              QWidget::showEvent(event);
              QLayoutItem * item=pFormLayout-> itemAt(0);
              int h=item->geometry().height();
          
              pScrollArea->setFixedHeight(h*3+2);
          
          }
          

          SPlattenS Offline
          SPlattenS Offline
          SPlatten
          wrote on last edited by
          #32

          @mpergand , thank you

          Kind Regards,
          Sy

          M 1 Reply Last reply
          0
          • SPlattenS SPlatten

            @mpergand , thank you

            M Offline
            M Offline
            mpergand
            wrote on last edited by mpergand
            #33

            @SPlatten
            I assumed that the formLayout is not empty, unless the app will crash.

            If you create one row in the constructor and want an empty form on show up, you can do:

            QWidget::showEvent(event);
            QLayoutItem* item=pFormLayout-> itemAt(0);
            int h=item->geometry().height();
            pScrollArea->setFixedHeight(h3+3);
            pFormLayout->removeRow(0);

            [WARNING]
            Multi showEvent can occur, you need to add some flag to prevent that:

            void Widget::showEvent(QShowEvent* event)
            {
                static bool firstShow=true;
            
                QWidget::showEvent(event);
                 
                if(firstShow)
                    {
                    QLayoutItem * item=pFormLayout-> itemAt(0);
                    int h=item->geometry().height();
                    pScrollArea->setFixedHeight(h*3+3);
                    pFormLayout->removeRow(0);
                    firstShow=false;
                    }
            }
            
            SPlattenS 2 Replies Last reply
            0
            • M mpergand

              @SPlatten
              I assumed that the formLayout is not empty, unless the app will crash.

              If you create one row in the constructor and want an empty form on show up, you can do:

              QWidget::showEvent(event);
              QLayoutItem* item=pFormLayout-> itemAt(0);
              int h=item->geometry().height();
              pScrollArea->setFixedHeight(h3+3);
              pFormLayout->removeRow(0);

              [WARNING]
              Multi showEvent can occur, you need to add some flag to prevent that:

              void Widget::showEvent(QShowEvent* event)
              {
                  static bool firstShow=true;
              
                  QWidget::showEvent(event);
                   
                  if(firstShow)
                      {
                      QLayoutItem * item=pFormLayout-> itemAt(0);
                      int h=item->geometry().height();
                      pScrollArea->setFixedHeight(h*3+3);
                      pFormLayout->removeRow(0);
                      firstShow=false;
                      }
              }
              
              SPlattenS Offline
              SPlattenS Offline
              SPlatten
              wrote on last edited by
              #34

              @mpergand , this layout will only be displayed if there is content to display.

              Kind Regards,
              Sy

              JoeCFDJ 1 Reply Last reply
              0
              • SPlattenS SPlatten

                @mpergand , this layout will only be displayed if there is content to display.

                JoeCFDJ Offline
                JoeCFDJ Offline
                JoeCFD
                wrote on last edited by JoeCFD
                #35

                @SPlatten Q
                When you use font size to set item height, it is better to use some reference chars. That is what I do:
                Rect bounding_rect = QFontMetrics( font ).tightBoundingRect( QString( "MWLPGHXYZmwlpghxyz" ) );
                use bounding_rect.height();
                And item height has to be a bit bigger than this height.

                1 Reply Last reply
                1
                • M mpergand

                  @SPlatten
                  I assumed that the formLayout is not empty, unless the app will crash.

                  If you create one row in the constructor and want an empty form on show up, you can do:

                  QWidget::showEvent(event);
                  QLayoutItem* item=pFormLayout-> itemAt(0);
                  int h=item->geometry().height();
                  pScrollArea->setFixedHeight(h3+3);
                  pFormLayout->removeRow(0);

                  [WARNING]
                  Multi showEvent can occur, you need to add some flag to prevent that:

                  void Widget::showEvent(QShowEvent* event)
                  {
                      static bool firstShow=true;
                  
                      QWidget::showEvent(event);
                       
                      if(firstShow)
                          {
                          QLayoutItem * item=pFormLayout-> itemAt(0);
                          int h=item->geometry().height();
                          pScrollArea->setFixedHeight(h*3+3);
                          pFormLayout->removeRow(0);
                          firstShow=false;
                          }
                  }
                  
                  SPlattenS Offline
                  SPlattenS Offline
                  SPlatten
                  wrote on last edited by SPlatten
                  #36

                  @mpergand , how is the showEvent connected and to which widget? I assume this is the MainWindow instance that this code is relevant to?

                  Kind Regards,
                  Sy

                  M 1 Reply Last reply
                  0
                  • SPlattenS SPlatten

                    @mpergand , how is the showEvent connected and to which widget? I assume this is the MainWindow instance that this code is relevant to?

                    M Offline
                    M Offline
                    mpergand
                    wrote on last edited by
                    #37

                    @SPlatten
                    Here Widget is the top level object, but it does not have to be.

                    how is the showEvent connected

                    It's connected to nothing, it's a virtual method of QWidget.

                    SPlattenS 1 Reply Last reply
                    0
                    • M mpergand

                      @SPlatten
                      Here Widget is the top level object, but it does not have to be.

                      how is the showEvent connected

                      It's connected to nothing, it's a virtual method of QWidget.

                      SPlattenS Offline
                      SPlattenS Offline
                      SPlatten
                      wrote on last edited by
                      #38

                      @mpergand, can you post your full example source, showing the relationship between pScrollArea and pFormLayout ?

                      Thank you,

                      Kind Regards,
                      Sy

                      1 Reply Last reply
                      0
                      • M Offline
                        M Offline
                        mpergand
                        wrote on last edited by mpergand
                        #39

                        Widget.h

                        #include <QWidget>
                        
                        class QScrollArea;
                        class QFormLayout;
                        
                        class Widget : public QWidget
                            {
                                Q_OBJECT
                                
                            public:
                                
                                        explicit Widget(QWidget *parent = nullptr);
                                        
                            private:
                                              void  showEvent(QShowEvent* event);
                                       QScrollArea* pScrollArea;
                                       QFormLayout* pFormLayout;
                        };
                        

                        Widget.cpp

                        Widget::Widget(QWidget *parent) : QWidget(parent)
                        {
                            auto vLayout=new QVBoxLayout;
                            setLayout(vLayout);
                            
                            pScrollArea=new QScrollArea;
                            vLayout->addWidget(pScrollArea);
                            
                            auto sWidget=new QWidget;
                            pScrollArea->setWidget(sWidget);
                            pScrollArea->setWidgetResizable(true);
                           
                            pFormLayout=new QFormLayout;
                            pFormLayout->setContentsMargins(0,0,0,1);
                            pFormLayout->setSpacing(0);
                            pFormLayout->setHorizontalSpacing(10);
                            sWidget->setLayout(pFormLayout);
                        
                            // add one row for calculation in showEvent
                            pFormLayout->addRow("", new QLabel());  
                        
                            vLayout->addWidget(new QPushButton("Clear"));
                        }
                        
                        SPlattenS 2 Replies Last reply
                        0
                        • M mpergand

                          Widget.h

                          #include <QWidget>
                          
                          class QScrollArea;
                          class QFormLayout;
                          
                          class Widget : public QWidget
                              {
                                  Q_OBJECT
                                  
                              public:
                                  
                                          explicit Widget(QWidget *parent = nullptr);
                                          
                              private:
                                                void  showEvent(QShowEvent* event);
                                         QScrollArea* pScrollArea;
                                         QFormLayout* pFormLayout;
                          };
                          

                          Widget.cpp

                          Widget::Widget(QWidget *parent) : QWidget(parent)
                          {
                              auto vLayout=new QVBoxLayout;
                              setLayout(vLayout);
                              
                              pScrollArea=new QScrollArea;
                              vLayout->addWidget(pScrollArea);
                              
                              auto sWidget=new QWidget;
                              pScrollArea->setWidget(sWidget);
                              pScrollArea->setWidgetResizable(true);
                             
                              pFormLayout=new QFormLayout;
                              pFormLayout->setContentsMargins(0,0,0,1);
                              pFormLayout->setSpacing(0);
                              pFormLayout->setHorizontalSpacing(10);
                              sWidget->setLayout(pFormLayout);
                          
                              // add one row for calculation in showEvent
                              pFormLayout->addRow("", new QLabel());  
                          
                              vLayout->addWidget(new QPushButton("Clear"));
                          }
                          
                          SPlattenS Offline
                          SPlattenS Offline
                          SPlatten
                          wrote on last edited by
                          #40

                          @mpergand , thank you, I'm creating a simple sample application, if I get it working in that then I can see what I need to do in my other application.

                          Kind Regards,
                          Sy

                          1 Reply Last reply
                          0
                          • M mpergand

                            Widget.h

                            #include <QWidget>
                            
                            class QScrollArea;
                            class QFormLayout;
                            
                            class Widget : public QWidget
                                {
                                    Q_OBJECT
                                    
                                public:
                                    
                                            explicit Widget(QWidget *parent = nullptr);
                                            
                                private:
                                                  void  showEvent(QShowEvent* event);
                                           QScrollArea* pScrollArea;
                                           QFormLayout* pFormLayout;
                            };
                            

                            Widget.cpp

                            Widget::Widget(QWidget *parent) : QWidget(parent)
                            {
                                auto vLayout=new QVBoxLayout;
                                setLayout(vLayout);
                                
                                pScrollArea=new QScrollArea;
                                vLayout->addWidget(pScrollArea);
                                
                                auto sWidget=new QWidget;
                                pScrollArea->setWidget(sWidget);
                                pScrollArea->setWidgetResizable(true);
                               
                                pFormLayout=new QFormLayout;
                                pFormLayout->setContentsMargins(0,0,0,1);
                                pFormLayout->setSpacing(0);
                                pFormLayout->setHorizontalSpacing(10);
                                sWidget->setLayout(pFormLayout);
                            
                                // add one row for calculation in showEvent
                                pFormLayout->addRow("", new QLabel());  
                            
                                vLayout->addWidget(new QPushButton("Clear"));
                            }
                            
                            SPlattenS Offline
                            SPlattenS Offline
                            SPlatten
                            wrote on last edited by
                            #41

                            @mpergand , Thank you, works a treat...now to port to my main application:

                                ui->setupUi(this);
                            
                                QVBoxLayout* pvbxLayout(new QVBoxLayout);
                                mpsa = new QScrollArea;
                                pvbxLayout->addWidget(mpsa);
                            
                                QWidget* pContainer(new QWidget);
                                mpsa->setWidget(pContainer);
                                int intFixedHeight(fontMetrics().height() * 3);
                                mpsa->setFixedHeight(intFixedHeight);
                                mpsa->setWidgetResizable(true);
                            
                                mpFormLayout = new QFormLayout;
                                mpFormLayout->setContentsMargins(0,0,0,0);
                                mpFormLayout->setSpacing(0);
                                mpFormLayout->setHorizontalSpacing(10);
                                pContainer->setLayout(mpFormLayout);
                            
                                for( int i=1; i<=10; i++ ) {
                                    mpFormLayout->addRow(QString::number(i),
                                                         new QLabel(QString("Hello World: %1").arg(i)));
                                }
                                pvbxLayout->addWidget(new QPushButton("HELLO"));
                                ui->centralwidget->setLayout(pvbxLayout);
                            

                            Kind Regards,
                            Sy

                            1 Reply Last reply
                            0

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