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Update listview model from delegate paint event

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  • R Offline
    R Offline
    Rory_1
    wrote on last edited by
    #1

    I have a QListView where I custom draw the iconview using a delegate. I need to save a QRect containing the coordinates of part of an iconview item that can be used later to translate coordinates from a mouse click event on the thumbnail. I am having difficulties overcoming the const status.

    Here is a code snippet from the delegate:

    void ThumbViewDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                               const QModelIndex &index) const
    {
        // define iconRect coordinates
    
        // save iconRect to model
        index.model()->setData(index, iconRect, Qt::UserRole+5);
    
        // this generates error
        // qt cannot convert 'this' pointer from 'const QAbstractItemModel' to 'QAbstractItemModel &'
    }
    

    How do I update the model?

    Thanks in advance.
    Rory

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      The paint event is not the place to do it at all, you should rather take a look at the mouse events related methods of QListView.

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

      R 1 Reply Last reply
      0
      • SGaistS SGaist

        Hi,

        The paint event is not the place to do it at all, you should rather take a look at the mouse events related methods of QListView.

        R Offline
        R Offline
        Rory_1
        wrote on last edited by Rory_1
        #3

        @SGaist

        Thanks. I would like to do it that way, but the paint event is the only place where the interior geometry of the iconview is defined. I think I have solved the problem with a signal/slot.

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          You're welcome !

          QAbstractItemView::visualRect should give you that information.

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

          R 1 Reply Last reply
          0
          • SGaistS SGaist

            You're welcome !

            QAbstractItemView::visualRect should give you that information.

            R Offline
            R Offline
            Rory_1
            wrote on last edited by Rory_1
            #5

            @SGaist

            No, it does not I am afraid. In my delegate I want the location of the icon, which I size and place within the visualRect. The visualRect only gives the outer dimensions.

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