QTableView dropEvent never be called - qt

Question

I'm trying to use QTableView to display a list of remote files, and I want to support dragging files to table view, but I wasn't able to make it work.
class MyTableView: public QTableView {
...
MyTableView(...) {
setDragEnabled(true);
setAcceptDrops(true);
setDragDropMode(DragDrop);
setDropIndicatorShown(true);
}
protected:
void dragEnterEvent(QDragEnterEvent *event) override {
// This function is called
const QMimeData* mimeData = event->mimeData();
QStringList test = mimeData->formats();
if (event->source() == nullptr) {
if (mimeData->hasUrls()) {
event->acceptProposedAction();
}
}
}
void dropEvent(QDropEvent *event) override {
// This function is not called.
}
....
}
class MyTableViewModel : public QAbstractTableModel {
...
Qt::ItemFlags flags(const QModelIndex& index) const {
if (!index.isValid())
return Qt::NoItemFlags;
Qt::ItemFlags flag = QAbstractItemModel::flags(index);
flag |= Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
return flag;
}
...
}
dragEnterEvent is called, but dropEvent is never called.
Someone notes that I need to override the dragMoveEvent, but how should I implement it ?
Also, there is a guy who mentioned that QAbstractItemModel::canDropMimeData,dropMimeData, supportedDragActions, I tried to override these functions and simply returns true, but it still doesn't work.
Or are there any working demos/examples available? Or what's the right way to do that?
I googled a lot but found nothing useful. Thanks.

Answer 1

Finally, I was able to make QTableView::dropEvent work as expected.
The official doc is here: Using Drag and Drop with Item Views. It's a long article but very useful.
Key pieces of code:
// Enable drop/drag in the constructor of MyTableView
setDragEnabled(true);
setAcceptDrops(true);
setDragDropMode(DragDrop);
setDropIndicatorShown(true);
// viewport()->setAcceptDrops(true); // it's not required although the doc mentioned it
// MyTableViewModel
Qt::ItemFlags MyTableViewModel::flags(const QModelIndex &index) const {
Qt::ItemFlags flag = QAbstractItemModel::flags(index);
if (index.isValid()) {
return flag | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
} else {
return flag | Qt::ItemIsDropEnabled;
}
}
Qt::DropActions MyTableViewModel::supportedDropActions() const {
return Qt::CopyAction | Qt::MoveAction;
}
bool MyTableViewModel::canDropMimeData(const QMimeData* data, Qt::DropAction action, int row, int col, const QModelIndex& parent) const {
return true; // just for simplicity
}