MyModel::dropMimeData() not working

MasterBLB

Guys,
Maybe you can see something I'm missing. My goal is to drag data from one view to other, with custom mime type; but dropMimeData in the target model is never called. I'm pretty sure I've setup everything required.

Well, fist views:

void MainWindow::setDragnDrop(QAbstractItemView *view, bool enable, QAbstractItemView::DragDropMode mode)
{
    view->setDragEnabled(enable);    
    view->setAcceptDrops(enable);
    view->viewport()->setAcceptDrops(enable);//I tried both
    view->setDropIndicatorShown(enable);
    view->setDragDropMode(mode);
}

calling in MainWindow constructor:

    setDragnDrop(ui->targetTreeView, true, QAbstractItemView::DragDrop);
    setDragnDrop(ui->sourceFilesList, true, QAbstractItemView::DragOnly);

so setting views for drag'n'drop - CHECK

Now the source model (descendant of QFileSystemModel) reimplementations:

    Qt::ItemFlags flags(const QModelIndex &index) const override;
    Qt::DropActions supportedDragActions() const override;
    QStringList mimeTypes() const override;
    QMimeData* mimeData(const QModelIndexList &indexes) const override;

and bodies:

Qt::ItemFlags PackagesModel::flags(const QModelIndex &index) const
{
    auto defaultFlags = QFileSystemModel::flags(index);

    if (index.isValid())
    {
        return defaultFlags | Qt::ItemIsDragEnabled;
    }

    return defaultFlags;
}

Qt::DropActions PackagesModel::supportedDragActions() const
{
    return Qt::CopyAction | Qt::LinkAction;
}

QStringList PackagesModel::mimeTypes() const
{
    QStringList types;
    types.append(DragNDropData::mimeType);
    return types;
}

QMimeData* PackagesModel::mimeData(const QModelIndexList &indexes) const
{
    QMimeData *data = new QMimeData;

    for (const QModelIndex &index : indexes)
    {
        //namespace DragNDropData { static const QString mimeType = "TerminalPackage"; }
        data->setData(DragNDropData::mimeType, fileInfo(index).absoluteFilePath().toUtf8());
    }

    return data;
}

required implementations in source model - CHECK

And last, target model (descendand of QFileSystemModel) have reimplemented:

    Qt::DropActions supportedDropActions() const override;
    QStringList mimeTypes() const override;
    bool canDropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) const override;
    bool dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) override;

bodies:

Qt::DropActions NavigationModel::supportedDropActions() const
{
    return Qt::LinkAction | Qt::CopyAction;
}

QStringList NavigationModel::mimeTypes() const
{
    QStringList types;
    types.append(DragNDropData::mimeType);
    return types;
}

#include <QDebug>
bool NavigationModel::canDropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent) const
{
    if (data->hasFormat(DragNDropData::mimeType) && parent.isValid() && action & (Qt::LinkAction | Qt::CopyAction))
    {
        qDebug() << "drop may be preformed";//this message shows up
        return true;
    }

    return false;
}

bool NavigationModel::dropMimeData(const QMimeData *data, Qt::DropAction action, int row, int column, const QModelIndex &parent)
{
    if (!canDropMimeData(data, action, row, column, parent))
    {
        return false;
    }

    QString path(data->data(DragNDropData::mimeType));

    qDebug() << "drop detected - path: " << path << ", action: " << action << ", row: " << row << ", column: " << column << ", parent: " << parent;
    return true;
}

required implementations in target model - CHECK

So dammit what else is needed to make it work??

MasterBLB

Hah, after posting the thread, and taking a look at it I've spotted what was missing - target model requires flags() to be reimplemented:

Qt::ItemFlags NavigationModel::flags(const QModelIndex &index) const
{
    auto defaultFlags = QFileSystemModel::flags(index);

    if (index.isValid())
    {
        //pozwól na przeciąganie prawidłowych indeksów
        return defaultFlags | Qt::ItemIsDropEnabled;
    }

    return defaultFlags;
}

with that change everything works like charm.