[Qt-interest] "Unable to save type" when drag in a QTreeWidget

[Andreas Pakulat]

On 17.08.10 09:32:41, cabieces julien wrote:
> Hi,
> 
> I want to develop drag and drop in a QTreeWidget. So, I implement
> dragEnterEvent, dragMoveEvent and dropEvent methods. It works fine but when
> I drag, I got this message :
> 
> QVariant::save: unable to save type 136.
> 
> Where type 136 belongs to QMetaType::ObjectStar type. It comes from the fact
> that I filled my QTreeWidgetItem data with "QObject*" objects and Qt try to
> serialize it in a DataStream but it doesn't have the appropriates operator<<
> and operator>>.
> 
> So, I would like to know the good way to implement drag'n drop or maybe the
> way to prevent from this message.

Implementing DnD with Itemviews is described in the Qt documentation:
http://doc.trolltech.com/latest/model-view-dnd.html

Andreas

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