Different size hint for selected cells in QListItemView

[andras]

Hello, I am trying to implement an item delegate for a list view which should display additional information for any selected item. In order to display this additional information, I would need to allocate more space on screen to the selected item. For this, I tried to implement sizeHint() of the item delegate in the following way:

QSize MyDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    const bool sel(option.state.testFlag(QStyle::State_Selected));
 
    QSize size1;
    QSize size2;
 
    /* compute size1 and size2... */
 
   if (sel)
   {
     return size1;
   }
   else
   {
     return size2;
   }
}

QSize MyDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    const bool sel(option.state.testFlag(QStyle::State_Selected));

    QSize size1;
    QSize size2;

    /* compute size1 and size2... */

   if (sel)
   {
     return size1;
   }
   else
   {
     return size2;
   }
}

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However, flag State_Selected does not seem to be set when the size hint is requested from the delegate. Is it a known fact that this flag is set only after the sizeHint method has been called, or am I doing something wrong?

Thanks,

Andras