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spinbox input add rows ??

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  • N n-2204

    @JonB yes tool is my class

    model = new QStandardItemModel(10, 13, this)
    ui.tableView->setModel(model);
    
    JonBJ Offline
    JonBJ Offline
    JonB
    wrote on last edited by JonB
    #9

    @n-2204
    You seem to have:

        QObject:: connect(ui.spinBox, SIGNAL(valueChanged(int)), model, SLOT(setTableRows())); 
    void tool::setTableRows()
    

    You have just said that model is of type QStandardItemModel.

    But setTableRows() is a method of tool.

    And earlier you had:

    QObject::connect(ui.spinBox, SIGNAL(valueChanged(int)), ui.tableView, SLOT(setTableRows()));
    

    which had the same issue,

    For the third time, if you followed https://wiki.qt.io/New_Signal_Slot_Syntax you would get compile-time help preventing you doing what you are trying to do.

    1 Reply Last reply
    1
    • VRoninV Offline
      VRoninV Offline
      VRonin
      wrote on last edited by VRonin
      #10

      I suspect the 3rd argument might be this. You can at least put the connect inside a Q_ASSUME() so you get a runtime crash in debug mode if the connect fails

      "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
      ~Napoleon Bonaparte

      On a crusade to banish setIndexWidget() from the holy land of Qt

      1 Reply Last reply
      2
      • N Offline
        N Offline
        n-2204
        wrote on last edited by
        #11

        yes, thanks using this works
        but what happening is i added 10 rows and when i change value in spinbox to 1 then no. of rows in table also changing to 1

        so i think using loop this prblm will be solved

        int noofrows = ui.spinBox->value();
           for (int i = 0;i < noofrows;i++)
        {
           model->insertRows(i,noofrows);
        }
        

        if use this loop when i enter 1 in spinbox it adds two rows ?

        JonBJ 1 Reply Last reply
        0
        • N n-2204

          yes, thanks using this works
          but what happening is i added 10 rows and when i change value in spinbox to 1 then no. of rows in table also changing to 1

          so i think using loop this prblm will be solved

          int noofrows = ui.spinBox->value();
             for (int i = 0;i < noofrows;i++)
          {
             model->insertRows(i,noofrows);
          }
          

          if use this loop when i enter 1 in spinbox it adds two rows ?

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by JonB
          #12

          @n-2204
          I already told you about that earlier.

          And finally I doubt you really intend

          model->insertRows(i, model->rowCount(QModelIndex()));

          Why rowCount() as the number of rows to add?? I would have thought given your loop you would want 1 there. You are confusing insertRows() to add multiple rows without a loop versus a loop to add one row at a time....

          EITHER a for loop with insertRow(), OR no for loop and insertRows(). You really should be able to understand this.

          Put some qDebug() statements in to see for yourself what is going on. That is what debugging is about.

          1 Reply Last reply
          1
          • N Offline
            N Offline
            n-2204
            wrote on last edited by
            #13

            ok understood
            thank you all

            1 Reply Last reply
            0
            • N Offline
              N Offline
              n-2204
              wrote on last edited by
              #14
               tooll::tool(QWidget* parent)
              : QMainWindow(parent)
                {
                ui.setupUi(this);
               model = new QStandardItemModel(10, 13, this)
               ui.tableView->setModel(model);
               connect(ui.spinBox, SIGNAL(valueChanged(int)), model, 
               SLOT(setTableRows())); 
              }
              void tool::setTable2Rows()
                 { 
               int noofrows2 = ui.spinBox_2->value();
               for (int i = 0;i < noofrows2;++i)
                {
                    model2->insertRow(i);
                  //qDebug() << i;
              }
              }
              

              when i am using new signal/slot why i am getting error
              (Error (active) E0304 no instance of overloaded function)

               connect(ui.spinBox, &QSpinBox::valueChanged, this,&tool::setTableRows);
              connect( sender, &Sender::valueChanged,    receiver, &Receiver::updateValue);
              
              jsulmJ VRoninV 2 Replies Last reply
              0
              • N n-2204
                 tooll::tool(QWidget* parent)
                : QMainWindow(parent)
                  {
                  ui.setupUi(this);
                 model = new QStandardItemModel(10, 13, this)
                 ui.tableView->setModel(model);
                 connect(ui.spinBox, SIGNAL(valueChanged(int)), model, 
                 SLOT(setTableRows())); 
                }
                void tool::setTable2Rows()
                   { 
                 int noofrows2 = ui.spinBox_2->value();
                 for (int i = 0;i < noofrows2;++i)
                  {
                      model2->insertRow(i);
                    //qDebug() << i;
                }
                }
                

                when i am using new signal/slot why i am getting error
                (Error (active) E0304 no instance of overloaded function)

                 connect(ui.spinBox, &QSpinBox::valueChanged, this,&tool::setTableRows);
                connect( sender, &Sender::valueChanged,    receiver, &Receiver::updateValue);
                
                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #15

                @n-2204 Please post whole error message. Does your tooll class have setTableRows slot? I'm asking because I only see setTable2Rows()

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

                N 1 Reply Last reply
                0
                • jsulmJ jsulm

                  @n-2204 Please post whole error message. Does your tooll class have setTableRows slot? I'm asking because I only see setTable2Rows()

                  N Offline
                  N Offline
                  n-2204
                  wrote on last edited by
                  #16

                  yes slot setTablerow() is also there

                   void tool::setTableRows()
                  { 
                  int noofrows = ui.spinBox->value();
                  for (int i = 0;i < noofrows;++i)
                  {
                    model->insertRow(i);
                  //qDebug() << i;
                  } 
                  

                  c++ no instance of overloaded function matches the argument list argument types are: (QSpinBox *, <unknown-type>, tooll , void (tool::)())
                  Severity Code Description Project File Line Suppression State Detail Description
                  Error (active) E0304 no instance of overloaded function "tool::connect" matches the argument list tool C:\User\source\repos\tool\tooll.cpp 265 argument types are: (QSpinBox *, <unknown-type>, tool , void (tool::)())

                  1 Reply Last reply
                  0
                  • N n-2204
                     tooll::tool(QWidget* parent)
                    : QMainWindow(parent)
                      {
                      ui.setupUi(this);
                     model = new QStandardItemModel(10, 13, this)
                     ui.tableView->setModel(model);
                     connect(ui.spinBox, SIGNAL(valueChanged(int)), model, 
                     SLOT(setTableRows())); 
                    }
                    void tool::setTable2Rows()
                       { 
                     int noofrows2 = ui.spinBox_2->value();
                     for (int i = 0;i < noofrows2;++i)
                      {
                          model2->insertRow(i);
                        //qDebug() << i;
                    }
                    }
                    

                    when i am using new signal/slot why i am getting error
                    (Error (active) E0304 no instance of overloaded function)

                     connect(ui.spinBox, &QSpinBox::valueChanged, this,&tool::setTableRows);
                    connect( sender, &Sender::valueChanged,    receiver, &Receiver::updateValue);
                    
                    VRoninV Offline
                    VRoninV Offline
                    VRonin
                    wrote on last edited by
                    #17

                    @n-2204 said in spinbox input add rows ??:

                    tooll::tool(QWidget* parent)

                    ????

                    What's the name of the class? tooll or tool? looks like a big mess here

                    "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                    ~Napoleon Bonaparte

                    On a crusade to banish setIndexWidget() from the holy land of Qt

                    1 Reply Last reply
                    0
                    • Christian EhrlicherC Offline
                      Christian EhrlicherC Offline
                      Christian Ehrlicher
                      Lifetime Qt Champion
                      wrote on last edited by
                      #18

                      @n-2204 said in spinbox input add rows ??:

                      c++ no instance of overloaded function matches the argument list argument types are: (QSpinBox *, <unknown-type>, tooll , void (tool::)())

                      How about taking a single look into the documentation? The problem is exactly explained there.

                      Simply writing something without understanding what you're doing doesn't help you at all.

                      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
                      1
                      • N Offline
                        N Offline
                        n-2204
                        wrote on last edited by n-2204
                        #19

                        thanks for sharing ref doc, its done

                         connect(ui.spinBox, QOverload<int>::of(&QSpinBox::valueChanged), 
                                 this, &tool::setTableRows);
                        
                        1 Reply Last reply
                        0
                        • N Offline
                          N Offline
                          n-2204
                          wrote on last edited by
                          #20

                          what changes need to do to end the row at end of row, now when i enter value in spinbox row is adding in top but i need to add the row at end how to do ?

                           void tool::setTableRows()
                          {
                          int noofrows = ui.spinBox->value();
                          for (int i = 0;i < noofrows;++i)
                          {
                             model->insertRow(i);
                          }
                           }
                          connect(ui.spinBox, QOverload<int>::of(&QSpinBox::valueChanged), 
                                   this, &tool::setTableRows);
                          
                          jsulmJ 1 Reply Last reply
                          0
                          • N n-2204

                            what changes need to do to end the row at end of row, now when i enter value in spinbox row is adding in top but i need to add the row at end how to do ?

                             void tool::setTableRows()
                            {
                            int noofrows = ui.spinBox->value();
                            for (int i = 0;i < noofrows;++i)
                            {
                               model->insertRow(i);
                            }
                             }
                            connect(ui.spinBox, QOverload<int>::of(&QSpinBox::valueChanged), 
                                     this, &tool::setTableRows);
                            
                            jsulmJ Offline
                            jsulmJ Offline
                            jsulm
                            Lifetime Qt Champion
                            wrote on last edited by
                            #21

                            @n-2204 https://doc.qt.io/qt-5/qabstractitemmodel.html#insertRow
                            "Inserts a single row before the given row in the child items of the parent specified".
                            So, what do you think should you pass as row to insertRow to add at the end of the table?

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

                            JonBJ 1 Reply Last reply
                            1
                            • jsulmJ jsulm

                              @n-2204 https://doc.qt.io/qt-5/qabstractitemmodel.html#insertRow
                              "Inserts a single row before the given row in the child items of the parent specified".
                              So, what do you think should you pass as row to insertRow to add at the end of the table?

                              JonBJ Offline
                              JonBJ Offline
                              JonB
                              wrote on last edited by
                              #22

                              @n-2204

                              @jsulm said in spinbox input add rows ??:

                              @n-2204 https://doc.qt.io/qt-5/qabstractitemmodel.html#insertRow
                              "Inserts a single row before the given row in the child items of the parent specified".
                              So, what do you think should you pass as row to insertRow to add at the end of the table?

                              Further to @jsulm. insertRow() says

                              Note: This function calls the virtual method insertRows.

                              And in the docs for insertRows, immediately adjacent to insertRow, if you read it it actually tells you what to pass so that

                              the rows are appended to any existing rows

                              Please take the time to read docs....

                              1 Reply Last reply
                              2
                              • N Offline
                                N Offline
                                n-2204
                                wrote on last edited by n-2204
                                #23

                                how can i set value of a spinbox and also edittable for user ?

                                 void tool::setTable2Rows()
                                 {
                                QAbstractItemModel* table2 = ui.tableView_2->model();
                                int rows2 = ui.spinBox_2->value();
                                  ui.spinBox->setValue(10);//this is not working
                                  model2->setRowCount(rows2);
                                }
                                

                                if i setvalue 10 then that no. of rows should be there

                                JonBJ 1 Reply Last reply
                                0
                                • N n-2204

                                  how can i set value of a spinbox and also edittable for user ?

                                   void tool::setTable2Rows()
                                   {
                                  QAbstractItemModel* table2 = ui.tableView_2->model();
                                  int rows2 = ui.spinBox_2->value();
                                    ui.spinBox->setValue(10);//this is not working
                                    model2->setRowCount(rows2);
                                  }
                                  

                                  if i setvalue 10 then that no. of rows should be there

                                  JonBJ Offline
                                  JonBJ Offline
                                  JonB
                                  wrote on last edited by
                                  #24

                                  @n-2204 said in spinbox input add rows ??:

                                  ui.spinBox->setValue(10);//this is not working

                                  Don't what you mean. "Not working" could indicate anything. I imagine this works perfectly well.

                                  how can i set value of a spinbox and also edittable for user ?

                                  if i setvalue 10 then that no. of rows should be there

                                  Don't know what these mean either.

                                  1 Reply Last reply
                                  0
                                  • N Offline
                                    N Offline
                                    n-2204
                                    wrote on last edited by
                                    #25

                                    not working means value is not set to 10

                                    and when i setvalue as 10 , 10 rows should be there in my table
                                    also when user change the spinbox value to 11 or 8 no. of rows in table should update

                                    JonBJ 1 Reply Last reply
                                    0
                                    • N n-2204

                                      not working means value is not set to 10

                                      and when i setvalue as 10 , 10 rows should be there in my table
                                      also when user change the spinbox value to 11 or 8 no. of rows in table should update

                                      JonBJ Offline
                                      JonBJ Offline
                                      JonB
                                      wrote on last edited by
                                      #26

                                      @n-2204 said in spinbox input add rows ??:

                                      not working means value is not set to 10

                                      What value is not set to 10? You can see what it sets:

                                      ui.spinBox->setValue(10);
                                      

                                      I would bet my bottom $ that it does exactly that.

                                      and when i setvalue as 10 , 10 rows should be there in my table

                                      Your code has

                                      model2->setRowCount(rows2);
                                      

                                      so that is what it does.

                                      also when user change the spinbox value to 11 or 8 no. of rows in table should update

                                      Which spinbox? Only if you call the code to set the rows when the spin value changes, and only if the code is correct. Which i have to say does not look like the case for the 4 lines of code you have shown...

                                      1 Reply Last reply
                                      0
                                      • N Offline
                                        N Offline
                                        n-2204
                                        wrote on last edited by
                                        #27

                                        code:

                                         tool::tool(QWidget* parent)
                                        : QMainWindow(parent)
                                        {
                                        ui.setupUi(this);
                                        model = new QStandardItemModel(0, 13, this);//row*col
                                        model2 = new QStandardItemModel(0, 19, this)
                                        ui.spinBox->setValue(10);
                                        ui.spinBox_2->setValue(10);
                                        

                                        using this in spinbox value is 10 but the same no. of rows is not updated in my table
                                        so when i set value in spinbox same no. of rows should be added in my table
                                        and when user change value in spinbox row should update (that is happening)

                                         connect(ui.spinBox, QOverload<int>::of(&QSpinBox::valueChanged), 
                                                 this, &tool::setTableRows);
                                         connect(ui.spinBox_2, QOverload<int>::of(&QSpinBox::valueChanged),
                                                 this, &tool::setTable2Rows);
                                         } 
                                        void tool::setTableRows()
                                        {
                                        QAbstractItemModel* table1 = ui.tableView->model();
                                        int rows = ui.spinBox->value();
                                        model->setRowCount(rows);
                                         } 
                                        
                                         void tool::setTable2Rows()
                                        {
                                        QAbstractItemModel* table2 = ui.tableView_2->model();
                                        int rows2 = ui.spinBox_2->value();
                                        model2->setRowCount(rows2);
                                        }
                                        
                                        JonBJ 1 Reply Last reply
                                        0
                                        • N n-2204

                                          code:

                                           tool::tool(QWidget* parent)
                                          : QMainWindow(parent)
                                          {
                                          ui.setupUi(this);
                                          model = new QStandardItemModel(0, 13, this);//row*col
                                          model2 = new QStandardItemModel(0, 19, this)
                                          ui.spinBox->setValue(10);
                                          ui.spinBox_2->setValue(10);
                                          

                                          using this in spinbox value is 10 but the same no. of rows is not updated in my table
                                          so when i set value in spinbox same no. of rows should be added in my table
                                          and when user change value in spinbox row should update (that is happening)

                                           connect(ui.spinBox, QOverload<int>::of(&QSpinBox::valueChanged), 
                                                   this, &tool::setTableRows);
                                           connect(ui.spinBox_2, QOverload<int>::of(&QSpinBox::valueChanged),
                                                   this, &tool::setTable2Rows);
                                           } 
                                          void tool::setTableRows()
                                          {
                                          QAbstractItemModel* table1 = ui.tableView->model();
                                          int rows = ui.spinBox->value();
                                          model->setRowCount(rows);
                                           } 
                                          
                                           void tool::setTable2Rows()
                                          {
                                          QAbstractItemModel* table2 = ui.tableView_2->model();
                                          int rows2 = ui.spinBox_2->value();
                                          model2->setRowCount(rows2);
                                          }
                                          
                                          JonBJ Offline
                                          JonBJ Offline
                                          JonB
                                          wrote on last edited by JonB
                                          #28

                                          @n-2204 said in spinbox input add rows ??:

                                          using this in spinbox value is 10 but the same no. of rows is not updated in my table

                                          If I understand correctly.

                                          At the time you call

                                          ui.spinBox->setValue(10);
                                          

                                          you have not yet done the

                                           connect(ui.spinBox, QOverload<int>::of(&QSpinBox::valueChanged), 
                                                   this, &tool::setTableRows);
                                          

                                          So if you are expecting the slot setTableRows() to be called to actually create rows during the setValue(), it won't be. Why should it?

                                          Either connect the signals before setting the values, or call the slots explicitly first time before you start out.

                                          Is that what you mean?

                                          N 1 Reply Last reply
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