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  4. [ SOLVED ]Problem in getting mouseEvent on QTableWidget
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[ SOLVED ]Problem in getting mouseEvent on QTableWidget

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  • M Offline
    M Offline
    M_31
    wrote on last edited by
    #9

    Now i am able to get the co-ordinates from mouse press & release event

    @
    if( object == ui->TableWidget->viewport() )
    {
    QMouseEvent mouseEvent = static_cast <QMouseEvent>( event );
    qDebug()<<"MouseButtonPress event!@"<<mouseEvent->x()<<":"<<mouseEvent->y();

            QTableWidgetItem *item =  ui->TableWidget->currentItem();
           // qDebug()<<"ITEMS !@"<<item->row()<<":"<<item->column();
    

    //This line is not working ..my app is getting crashing ..saying that ..No value found in "item"

        }
    

    @

    Is there any other to get the QTableWidget row & column value using mouse event other than X & Y
    co-ordinates....

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    • G Offline
      G Offline
      giesbert
      wrote on last edited by
      #10

      [quote author="M_31" date="1316014954"]Now i am able to get the co-ordinates from mouse press & release event

      @
      if( object == ui->TableWidget->viewport() )
      {
      QMouseEvent mouseEvent = static_cast <QMouseEvent>( event );
      qDebug()<<"MouseButtonPress event!@"<<mouseEvent->x()<<":"<<mouseEvent->y();

              QTableWidgetItem *item =  ui->TableWidget->currentItem();
             // qDebug()<<"ITEMS !@"<<item->row()<<":"<<item->column();
      

      //This line is not working ..my app is getting crashing ..saying that ..No value found in "item"

          }
      

      @

      Is there any other to get the QTableWidget row & column value using mouse event other than X & Y
      co-ordinates....[/quote]

      No, it is not.

      The only way is to use "indexAt":http://doc.qt.nokia.com/latest/qabstractitemview.html#indexAt

      Nokia Certified Qt Specialist.
      Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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      • L Offline
        L Offline
        luca72
        wrote on last edited by
        #11

        Hello i have one question :

        @bool Widget::eventFilter(QObject *object, QEvent *event){
        if (object == ui->tableWidget->viewport()){
        QMouseEvent mouseEvent = static_cast<QMouseEvent>(event);
        if (mouseEvent->button()==2){
        messaggio = new QMessageBox;
        messaggio->information(this,tr("Packing"),tr("Tasto destro schiacciato"),messaggio->Ok);
        }
        }
        }@

        Why the message is open two time when i click the right button?

        Thanks

        Luca

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        • G Offline
          G Offline
          giesbert
          wrote on last edited by
          #12

          it is called for mousepress and mouserelease... :-)
          and you even do not check, which one is called...

          @
          bool Widget::eventFilter(QObject *object, QEvent *event)
          {
          if (object == ui->tableWidget->viewport())
          {
          QMouseEvent mouseEvent = static_cast<QMouseEvent>(event);
          if ((QEvent::MouseButtonPress == event->type()) && (mouseEvent->button()==Qt::RightButton))
          {
          messaggio = new QMessageBox;
          messaggio->information(this,tr("Packing"),tr("Tasto destro schiacciato"),messaggio->Ok);
          }
          }
          }
          @

          Additionally, I suggest not to use magic numbers, if there are enums that can be used...

          Nokia Certified Qt Specialist.
          Programming Is Like Sex: One mistake and you have to support it for the rest of your life. (Michael Sinz)

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          • M Offline
            M Offline
            M_31
            wrote on last edited by
            #13

            Thanks Gerolf...for your valuable inputs..
            Its working fine with viewport and i achived my task...

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            • T Offline
              T Offline
              timswoosh
              wrote on last edited by
              #14

              Hi, everyone!

              I had a similar problem and used a similiar approach to it, but I faced an obstacle when used method QTableWidget::itemAt: it uses coordinates relative to the left upper corner of data cells and doesn't take to account header cells!
              So, when I transformed global coordiantes to the widget's ones via QWidget::mapFromGlobal I obtained not what I needed at all!
              It gave me coordinates relative to the left upper corner of the widget itself, not the data cells.
              How can I obtain the proper coordinates?

              I wanted to try methods QTableView::horizontalOffset() and QTableView::verticalOffset(), but they are protected :(
              (Sorry for my English, it's not my native language)

              [quote author="Gerolf" date="1316016131"]
              No, it is not.

              The only way is to use "indexAt":http://doc.qt.nokia.com/latest/qabstractitemview.html#indexAt[/quote]

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              0
              • T Offline
                T Offline
                timswoosh
                wrote on last edited by
                #15

                Hi, everyone!

                I had a similar problem and used a similiar approach to it, but I faced an obstacle when used method QTableWidget::itemAt: it uses coordinates relative to the left upper corner of data cells and doesn't take to account header cells!
                So, when I transformed global coordiantes to the widget's ones via QWidget::mapFromGlobal I obtained not what I needed at all!
                It gave me coordinates relative to the left upper corner of the widget itself, not the data cells.
                How can I obtain the proper coordinates?

                I wanted to try methods QTableView::horizontalOffset() and QTableView::verticalOffset(), but they are protected :(
                (Sorry for my English, it's not my native language)

                [quote author="Gerolf" date="1316016131"]
                No, it is not.

                The only way is to use "indexAt":http://doc.qt.nokia.com/latest/qabstractitemview.html#indexAt[/quote]

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                • A Offline
                  A Offline
                  andre
                  wrote on last edited by
                  #16

                  Well, as you can see from the QAbstractScrollArea documentation, of which QTableWidget is derived, the actual scrolling area is provided by a widget called viewport. That widget can be also be used for your coordinate transformations.

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                  • A Offline
                    A Offline
                    andre
                    wrote on last edited by
                    #17

                    Well, as you can see from the QAbstractScrollArea documentation, of which QTableWidget is derived, the actual scrolling area is provided by a widget called viewport. That widget can be also be used for your coordinate transformations.

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                    • T Offline
                      T Offline
                      timswoosh
                      wrote on last edited by
                      #18

                      Thank you, that's what I need!
                      Sorry I failed to find it myself...

                      I guess it would be advisable to add a link to viewport() member into QTableWidgetItem::itemAt() documentation.

                      [quote author="Andre" date="1421132571"]Well, as you can see from the QAbstractScrollArea documentation, of which QTableWidget is derived, the actual scrolling area is provided by a widget called viewport. That widget can be also be used for your coordinate transformations.[/quote]

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                      0
                      • T Offline
                        T Offline
                        timswoosh
                        wrote on last edited by
                        #19

                        Thank you, that's what I need!
                        Sorry I failed to find it myself...

                        I guess it would be advisable to add a link to viewport() member into QTableWidgetItem::itemAt() documentation.

                        [quote author="Andre" date="1421132571"]Well, as you can see from the QAbstractScrollArea documentation, of which QTableWidget is derived, the actual scrolling area is provided by a widget called viewport. That widget can be also be used for your coordinate transformations.[/quote]

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