Qt 5.9 | Qt XML Patterns | File System Example | filetree.h Example File

Qt 5.9.3 Reference Documentation

# filetree.h Example File

filetree/filetree.h

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      #include <QtCore/QFileInfo>
      #include <QtCore/QDir>
      #include <QtCore/QVector>
      #include <QtXmlPatterns/QSimpleXmlNodeModel>

      class FileTree : public QSimpleXmlNodeModel
      {
      public:
          FileTree(const QXmlNamePool &namePool);

          QXmlNodeModelIndex nodeFor(const QString &fileName) const;

          virtual QXmlNodeModelIndex::DocumentOrder compareOrder(const QXmlNodeModelIndex&, const QXmlNodeModelIndex&) const;
          virtual QXmlName name(const QXmlNodeModelIndex &node) const;
          virtual QUrl documentUri(const QXmlNodeModelIndex &node) const;
          virtual QXmlNodeModelIndex::NodeKind kind(const QXmlNodeModelIndex &node) const;
          virtual QXmlNodeModelIndex root(const QXmlNodeModelIndex &node) const;
          virtual QVariant typedValue(const QXmlNodeModelIndex &node) const;
      protected:
          virtual QVector<QXmlNodeModelIndex> attributes(const QXmlNodeModelIndex &element) const;
          virtual QXmlNodeModelIndex nextFromSimpleAxis(SimpleAxis, const QXmlNodeModelIndex&) const;

      private:
          enum Type {
              File,
              Directory,
              AttributeFileName,
              AttributeFilePath,
              AttributeSize,
              AttributeMIMEType,
              AttributeSuffix
          };

          inline QXmlNodeModelIndex nextSibling(const QXmlNodeModelIndex &nodeIndex,
                                                const QFileInfo &from,
                                                qint8 offset) const;
          inline const QFileInfo &toFileInfo(const QXmlNodeModelIndex &index) const;
          inline QXmlNodeModelIndex toNodeIndex(const QFileInfo &index,
                                                Type attributeName) const;
          inline QXmlNodeModelIndex toNodeIndex(const QFileInfo &index) const;

          /*
           One possible improvement is to use a hash, and use the &*&value()
           trick to get a pointer, which would be stored in data() instead
           of the index.
          */
          mutable QVector<QFileInfo>  m_fileInfos;
          const QDir::Filters         m_filterAllowAll;
          const QDir::SortFlags       m_sortFlags;
          QVector<QXmlName>           m_names;
      };