QComboBox in QTreeView-cell

Question

I want to show a QComboBox within specific cells of a QTreeView. I know I have to use an own model for it. The whole thing is already working properly with QIcons shown in the cell, but I fail doing the same with a combobox. That's what my model looks like (some incomplete pseudo-code):

QVariant MyListModel::data(const QModelIndex &index, int role) const
{
   ...

   switch(role)
   {
      ...
      case Qt::DecorationRole:
         switch(index.column())
         {
            case eBLA:
               // return QIcon(); --> compiles properly
               return m_placePosCombos[index.row()]; --> compilation fails
               return QComboBox(); --> compilation fails
               break;
            default:

As soon as I try to return a QComboBox, I get a compilation error

cannot convert from 'const QComboBox' to 'QVariant'

MyListModel inherits from QAbstractListModel.

Any idea what I have to do to use a QComboBox instead of a stupid icon?

Thanks!

You cannot return a `QObject` by copy (or move), and you cannot wrap one in a `QVariant` (although you can store a pointer to one). — jonspaceharper, Aug 17 '16 at 08:15

score 2 · Accepted Answer · answered Aug 17 '16 at 06:55

No, model is only for data handle in a view, and not for change the view. You need to learn and use: QItemDelegate (sorry for not show you here all the code, it needs place and time for that... the time you may have to read tuto and relative doc... hope that help)

tuto for QItemDelegate

QItemDelegate API class Qt5

QComboBox in QTreeView-cell

1 Answers1