QStandardItemModel with QListView, external drop action does not work - qt

Question

I'm using Qt 4.2.
I've a QMainWindow with a QListView inside which uses a QStandardItemModel for showing some items that I get from .desktop files.
Now I'm trying to implement a drop action over the app so for ex: I can run firefox when a .html file is droped over the firefox item.
So this is what I've done:
-for the listView:
viewport()->setAcceptDrops(true);
setAcceptDrops(true);
setDragEnabled(true);
setDropIndicatorShown(true);
setDragDropMode(QListView::DragDrop);
-for the standardItemModel:
Qt::DropActions supportedDropActions() const {
return Qt::CopyAction | Qt::MoveAction;
}
Qt::ItemFlags flags(const QModelIndex &index) const {
return Qt::ItemIsSelectable | Qt::ItemIsDragEnabled |
Qt::ItemIsDropEnabled | Qt::ItemIsEnabled;
}
QStringList mimeTypes() const {
QStringList types;
types<<"text/uri-list";
return types;
}
bool dropMimeData(const QMimeData *data, Qt::DropAction action,
int row, int column, const QModelIndex &parent) {
qDebug() << "dropMimeData";
}
After that, I never get the dropMimeData debug message when I drop some file over the app.

Answer 1

You also need to reimplement dragEnterEvent() and dropEvent() - they are virtual functions in QListView.
From the documentation:
Dropping
To be able to receive media dropped on a widget, call
setAcceptDrops(true) for the widget, and reimplement the
dragEnterEvent() and dropEvent() event handler functions.
For example,
the following code enables drop events in the constructor of a QWidget
subclass, making it possible to usefully implement drop event
handlers:
void Window::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasFormat("text/plain"))
event->acceptProposedAction();
}
void Window::dropEvent(QDropEvent *event)
{
textBrowser->setPlainText(event->mimeData()->text());
mimeTypeCombo->clear();
mimeTypeCombo->addItems(event->mimeData()->formats());
event->acceptProposedAction();
}