Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. [ SOLVED ]Problem in getting mouseEvent on QTableWidget
Forum Updated to NodeBB v4.3 + New Features

[ SOLVED ]Problem in getting mouseEvent on QTableWidget

Scheduled Pinned Locked Moved General and Desktop
19 Posts 5 Posters 21.5k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • A Offline
    A Offline
    andre
    wrote on last edited by
    #2

    You should probably install the event filter not on the TableWidget itself, but on ui->TableWidget->viewPort()

    1 Reply Last reply
    0
    • M Offline
      M Offline
      M_31
      wrote on last edited by
      #3

      After changing into viewport()...
      like
      @
      #include <QMouseEvent>
      #include <QKeyEvent>
      #include <QEvent>
      CTestDlg::CTestDlg()
      {
      ui->setupUi(this);
      ui->TableWidget->setSelectionMode( QAbstractItemView::ExtendedSelection );
      ui->TableWidget->setMouseTracking( true );
      ui->TableWidget->viewport()->installEventFilter( this );
      }

      bool CTestDlg::eventFilter(QObject *object, QEvent *event)
      {

      if (event->type() == QEvent::MouseButtonPress )
      {
      qDebug()<<"MOUSE BUTTON PRESSED @";
      if ( object == ui->TableWidget )
      {
      QTableWidgetItem *item = ui->TableWidget->currentItem();
      qDebug()<<item->row()<<":"<<item->column();
      }
      return QObject::eventFilter(object, event);
      }
      else if (event->type() == QEvent::MouseButtonRelease )
      {
      qDebug()<<"MOUSE BUTTON RELEASED @";
      if ( object == ui->TableWidget )
      {
      QTableWidgetItem *item = ui->TableWidget->currentItem();
      qDebug()<<item->row()<<":"<<item->column();
      }
      return QObject::eventFilter(object, event);
      }
      return QObject::eventFilter(object, event);

      }
      @

      Now i am getting only the "MOUSE BUTTON PRESSED @" & "MOUSE BUTTON RELEASED @"

      but not the item row or column value..!!!

      1 Reply Last reply
      0
      • G Offline
        G Offline
        giesbert
        wrote on last edited by
        #4

        object is not the tableview, it's the view port!

        @
        bool CTestDlg::eventFilter(QObject *object, QEvent *event)
        {
        if (event->type() == QEvent::MouseButtonPress )
        {
        qDebug()<<"MOUSE BUTTON PRESSED @";
        if ( object == ui->TableWidget->viewport() ) // changed here
        {
        QTableWidgetItem *item = ui->TableWidget->currentItem();
        qDebug()<<item->row()<<":"<<item->column();
        }
        return QObject::eventFilter(object, event);
        }
        else if (event->type() == QEvent::MouseButtonRelease )
        {
        qDebug()<<"MOUSE BUTTON RELEASED @";
        if ( object == ui->TableWidget->viewport() ) // changed here
        {
        QTableWidgetItem *item = ui->TableWidget->currentItem();
        qDebug()<<item->row()<<":"<<item->column();
        }
        return QObject::eventFilter(object, event);
        }
        return QObject::eventFilter(object, event);
        }
        @

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

        1 Reply Last reply
        0
        • A Offline
          A Offline
          andre
          wrote on last edited by
          #5

          Note that lines 11 and 21 do nothing in the example above. At least, nothing that line 23 would not do just as well... ;-)

          Edit:
          comment is obviously pointed at M_31, not at Gerolf :-)

          1 Reply Last reply
          0
          • G Offline
            G Offline
            giesbert
            wrote on last edited by
            #6

            I only fixed the compare statement, not optimized the whole code ;-)

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

            1 Reply Last reply
            0
            • L Offline
              L Offline
              luca72
              wrote on last edited by
              #7

              There is a way to know if is the right or left button thet he press?

              Luca

              1 Reply Last reply
              0
              • G Offline
                G Offline
                giesbert
                wrote on last edited by
                #8

                Cast the event to a QMouseEvent and use the members

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

                1 Reply Last reply
                0
                • 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....

                  1 Reply Last reply
                  0
                  • 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)

                    1 Reply Last reply
                    0
                    • 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

                      1 Reply Last reply
                      0
                      • 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)

                        1 Reply Last reply
                        0
                        • 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...

                          1 Reply Last reply
                          0
                          • 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]

                            1 Reply Last reply
                            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]

                              1 Reply Last reply
                              0
                              • 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.

                                1 Reply Last reply
                                0
                                • 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.

                                  1 Reply Last reply
                                  0
                                  • 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]

                                    1 Reply Last reply
                                    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]

                                      1 Reply Last reply
                                      0

                                      • Login

                                      • Login or register to search.
                                      • First post
                                        Last post
                                      0
                                      • Categories
                                      • Recent
                                      • Tags
                                      • Popular
                                      • Users
                                      • Groups
                                      • Search
                                      • Get Qt Extensions
                                      • Unsolved