ace_metadatamodel.h

#ifndef ACE_METADATAMODEL_H
#define ACE_METADATAMODEL_H
#include <memory>
#include <QAbstractItemModel>
#include "emetadata.h"
//



namespace Ace
{
   class MetadataModel : public QAbstractItemModel
   {
      Q_OBJECT
   public:
      virtual QStringList mimeTypes() const override final;
      virtual Qt::DropActions supportedDropActions() const override final;
      virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const override final;
      virtual QModelIndex index(int row, int column, const QModelIndex& parent) const override final;
      virtual QModelIndex parent(const QModelIndex& child) const override final;
      virtual Qt::ItemFlags flags(const QModelIndex& index) const override final;
      virtual int rowCount(const QModelIndex& parent) const override final;
      virtual int columnCount(const QModelIndex& parent) const override final;
      virtual QMimeData* mimeData(const QModelIndexList& indexes) const override final;
      virtual QVariant data(const QModelIndex& index, int role) const override final;
      virtual bool setData(const QModelIndex& index, const QVariant& value, int role) override final;
      virtual bool dropMimeData(const QMimeData* data, Qt::DropAction action, int row, int column, const QModelIndex& parent) override final;
   public:
      enum Roles
      {
         RawImageData = 10000
      };
      explicit MetadataModel(QObject* parent = nullptr);
      bool isImage(const QModelIndex& index) const;
      bool isContainer(const QModelIndex& index) const;
      bool readOnly() const;
      EMetadata meta() const;
      bool insert(const QModelIndex& parent, EMetadata::Type type);
      bool remove(const QModelIndex& index);
      void setMeta(const EMetadata& newRoot);
      void setReadOnly(bool state);
   private:
      class Node;
   private:
      MetadataModel::Node* pointer(const QModelIndex& index) const;
      bool setKey(const QModelIndex& index, const QString& newKey);
      std::unique_ptr<MetadataModel::Node> take(Node* node);
      bool insert(const QModelIndex& parent, int row, std::unique_ptr<Node>&& node);
      EMetadata buildMeta(const Node* node) const;
      std::unique_ptr<MetadataModel::Node> buildNode(const EMetadata& meta);
      static const char* _mimeType;
      Node* _root;
      bool _readOnly {false};
   };
}



#endif