Update listview model from delegate paint event

Rory_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

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.

Rory_1

@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.

SGaist

You're welcome !

QAbstractItemView::visualRect should give you that information.

Rory_1

@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.