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  4. [SOLVED] Insert row from Qtableview to another
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[SOLVED] Insert row from Qtableview to another

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  • A Offline
    A Offline
    advseo32
    wrote on last edited by
    #23

    i still can't know what i do ,

    subclass Qtablewidget and implement keypressevent
    or use shortcuts .

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #24

      You can also use an event filter to catch that event, this really is up to you to choose the solution that meets your need

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

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      • A Offline
        A Offline
        advseo32
        wrote on last edited by
        #25

        i have implemented keypressEvent function

        and it works perfectly, but when i start to somme conditions the programme crashes

        her is my code @void MonTableauWidget::keyPressEvent(QKeyEvent *event)
        {
        int LastRow = this->rowCount();

        switch (event->key()) {
        case Qt::Key_Down :
        // the problem occured  when i added the line below if(!this->item(LastRow,0)->text().isEmpty())
            this->insertRow(this->rowCount());
            break;
        case Qt::Key_Up :
         this->removeRow(1);
            break;
        case Qt::Key_0 :
        
            QMessageBox::information(this,"Row coutn",QString::number( LastRow)) ;
            break;
        default:
            QTableWidget::keyPressEvent(event);
            break;
        }
        

        }
        @

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #26

          @removeRow(1); << What would happen if you don't have a row number 1 ?@

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

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          • A Offline
            A Offline
            advseo32
            wrote on last edited by
            #27

            i have used the debugger to determine what's the issue
            and i think the issue is located her
            because when i delete this line every thing works perfectly
            @this->item(LastRow,0)->text().isEmpty() ;@

            this not refering to the customQtableWidget it's reffering to the
            QtableWidgetItem objet

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            • A Offline
              A Offline
              advseo32
              wrote on last edited by
              #28

              [quote author="SGaist" date="1374875944"]@removeRow(1); << What would happen if you don't have a row number 1 ?@[/quote]

              nothing is happened , means no row have to removed , but i have correct this issue

              @this->removeRow(this->rowCount()-1); @
              and this should works , and finally it works

              thank's for the hint

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              • A Offline
                A Offline
                advseo32
                wrote on last edited by
                #29

                her is my finall code @void MonTableauWidget::keyPressEvent(QKeyEvent *event)
                {
                int LastRow = this->rowCount()-1;

                // bool ok = this->item(LastRow,0)->text().isEmpty() ;

                switch (event->key()) {
                case Qt::Key_Down :
                    if(LastRow)
                        this->insertRow(this->rowCount());
                    break;
                case Qt::Key_Up :
                 this->removeRow(LastRow);
                    break;
                default:
                    QTableWidget::keyPressEvent(event);
                    break;
                }
                

                @

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                • A Offline
                  A Offline
                  advseo32
                  wrote on last edited by
                  #30

                  i lost hope to get the solution from my self,

                  the only problem now is how to test if Cell is Empty

                  i use this

                  @this->item(row,col)->text().isEmpty(); @

                  but the programme crashes , what the probleme her ??

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                  • JKSHJ Offline
                    JKSHJ Offline
                    JKSH
                    Moderators
                    wrote on last edited by
                    #31

                    [quote author="advseo32" date="1374923562"]
                    @this->item(row,col)->text().isEmpty(); @

                    but the programme crashes , what the probleme her ??[/quote]If there is no data in the cell, then this->item() returns NULL.

                    Your program will crash if you dereference a null pointer.

                    Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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                    • A Offline
                      A Offline
                      advseo32
                      wrote on last edited by
                      #32

                      [quote author="JKSH" date="1374928103"][quote author="advseo32" date="1374923562"]
                      @this->item(row,col)->text().isEmpty(); @

                      but the programme crashes , what the probleme her ??[/quote]If there is no data in the cell, then this->item() returns NULL.

                      Your program will crash if you dereference a null pointer.

                      [/quote]

                      Yeah! that's true , because QTableWidgetItem was created only when the user fill in the cell

                      do you have another way to check if the cell if not empty

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                      • JKSHJ Offline
                        JKSHJ Offline
                        JKSH
                        Moderators
                        wrote on last edited by
                        #33

                        [quote author="advseo32" date="1374942257"]do you have another way to check if the cell if not empty [/quote]If there is no data in the cell, then this->item() returns NULL :)

                        Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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                        • A Offline
                          A Offline
                          advseo32
                          wrote on last edited by
                          #34

                          [quote author="JKSH" date="1374942566"][quote author="advseo32" date="1374942257"]do you have another way to check if the cell if not empty [/quote]If there is no data in the cell, then this->item() returns NULL :)[/quote]

                          Probably , you have give the answer from the the begning , but i haven't pay attention to it

                          yes it's works
                          @if (this->item(LastRow,0) != 0)@

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                          • A Offline
                            A Offline
                            advseo32
                            wrote on last edited by
                            #35

                            now

                            i want to change the behavior of vertical header in Qtableview

                            this is what i mean:

                            when user start fill table cells, i want this sign(*) present in vertical header instead of numbers

                            when user moves beteween rows , i want also this sign(>) present in vertical header instead of numbers

                            what function i need to implement

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #36

                              Did you read the documentation of the various classes you are using ? For example "cellChanged":http://qt-project.org/doc/qt-4.8/qtablewidget.html#cellChanged ?

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

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                              • A Offline
                                A Offline
                                advseo32
                                wrote on last edited by
                                #37

                                yes i did, but what functions are responsible for doing this

                                sign(*) present in vertical header instead of numbers

                                sign(>) present in vertical header instead of numbers

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                                • JKSHJ Offline
                                  JKSHJ Offline
                                  JKSH
                                  Moderators
                                  wrote on last edited by
                                  #38

                                  [quote author="SGaist" date="1374952377"]Did you read the documentation of the various classes you are using ?
                                  [quote author="advseo32" date="1374964095"]yes i did, but what functions are responsible for...[/quote][/quote]Please read more thoroughly.

                                  Go to the "documentation":http://qt-project.org/doc/qt-5.1/qtwidgets/qtablewidget.html again and search for "header". Try different functions with good names to see what they do.

                                  Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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                                  • A Offline
                                    A Offline
                                    advseo32
                                    wrote on last edited by
                                    #39

                                    i have try many functions but no result

                                    Her is my try
                                    this function called when the user start editing cell "CellChanged Signal"
                                    @
                                    void Dialog::newfunction()
                                    {
                                    QModelIndex index ;
                                    index = tableau->model()->index(0,0) ;
                                    tableau->verticalHeader()->model()->setData(index,QPixmap("imgs/arrow.png"),Qt::DecorationRole);
                                    }

                                    @

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                                    • JKSHJ Offline
                                      JKSHJ Offline
                                      JKSH
                                      Moderators
                                      wrote on last edited by
                                      #40

                                      Good on you for trying.
                                      [quote author="advseo32" date="1375041952"]
                                      Her is my try
                                      this function called when the user start editing cell "CellChanged Signal"
                                      @
                                      void Dialog::newfunction()
                                      {
                                      QModelIndex index ;
                                      index = tableau->model()->index(0,0) ;
                                      tableau->verticalHeader()->model()->setData(index,QPixmap("imgs/arrow.png"),Qt::DecorationRole);
                                      }

                                      @
                                      [/quote]There are two major issues:

                                      If you haven't set any header data, tableau->verticalHeader()->model() returns NULL

                                      You have 2 models here. tableau->model() is the table model, tableau->verticalHeader()->model() is the header model. You created an index for the table model, so you can't use that index to set data in the header model.

                                      Hint: If you use setHeaderData(), you don't need an index

                                      Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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                                      • A Offline
                                        A Offline
                                        advseo32
                                        wrote on last edited by
                                        #41

                                        i have use setHeaderData but no thing shown

                                        @tableau->verticalHeader()->model()->setHeaderData(0,Qt::Vertical,"***", Qt::DisplayRole) ;@

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                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #42

                                          Since you are using QTableWidget, did you take a look at this part of the "QTableWidget documentation":http://qt-project.org/doc/qt-4.8/qtablewidget.html#verticalHeaderItem ?

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

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