看看下面的內容是否有幫助:
Since access to the data displayed by the view is controlled by a model, the model used also has to provide support for drag and drop operations. The actions supported by a model can be specified by reimplementing the QAbstractItemModel::supportedDropActions() function. For example, copy and move operations are enabled with the following code:
Qt::DropActions DragDropListModel::supportedDropActions() const
{
return Qt::CopyAction | Qt::MoveAction;
}
Although any combination of values from Qt::DropActions can be given, the model needs to be written to support them. For example, to allow Qt::MoveAction to be used properly with a list model, the model must provide an implementation of QAbstractItemModel::removeRows(), either directly or by inheriting the implementation from its base class.
