int columnCount(const QModelIndex &parent) const override;
QVariant data(const QModelIndex &parent, int role) const override;
QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
+ Qt::ItemFlags flags(const QModelIndex &index) const override;
+ bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
void add_clip(const Clip &clip);
size_t size() const { return clips.size(); }