+ //! Returns object by the given Model index.
+ //! Returns 0 if the given index is not index of a object
+ virtual ObjectPtr object(const QModelIndex& theIndex) const;
+
+ //! Returns QModelIndex which corresponds to the given object
+ //! If the object is not found then index is not valid
+ virtual QModelIndex objectIndex(const ObjectPtr& theObject) const;
+
+ //! Returns true if the given document is a sub-document of this tree
+ virtual bool hasDocument(const DocumentPtr& theDoc) const;
+
+ //! Returns parent index of the given object
+ virtual QModelIndex findParent(const ObjectPtr& theObject) const;
+
+ //! Returns index corresponded to the group
+ virtual QModelIndex findGroup(const std::string& theGroup) const;
+
+ //! Return a Part object
+ virtual ResultPartPtr part() const;
+
+ private:
+
+ //! Returns document of the current part
+ DocumentPtr partDocument() const;
+
+ //! Types of QModelIndexes
+ enum DataIds
+ {