model.h Example File | Qt Widgets 5.6

Qt 5.6 | Qt Widgets | Interview | model.h Example File

Qt 5.6.2 Reference Documentation

# model.h Example File

itemviews/interview/model.h

      /****************************************************************************
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      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
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      ** This file is part of the demonstration applications of the Qt Toolkit.
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      ** $QT_BEGIN_LICENSE:LGPL21$
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      ** Alternatively, this file may be used under the terms of the GNU Lesser
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      #ifndef MODEL_H
      #define MODEL_H

      #include <QAbstractItemModel>
      #include <QFileIconProvider>
      #include <QIcon>
      #include <QVector>

      class Model : public QAbstractItemModel
      {
          Q_OBJECT

      public:
          Model(int rows, int columns, QObject *parent = 0);
          ~Model();

          QModelIndex index(int row, int column, const QModelIndex &parent) const Q_DECL_OVERRIDE;
          QModelIndex parent(const QModelIndex &child) const Q_DECL_OVERRIDE;

          int rowCount(const QModelIndex &parent) const Q_DECL_OVERRIDE;
          int columnCount(const QModelIndex &parent) const Q_DECL_OVERRIDE;

          QVariant data(const QModelIndex &index, int role) const Q_DECL_OVERRIDE;
          QVariant headerData(int section, Qt::Orientation orientation, int role) const Q_DECL_OVERRIDE;

          bool hasChildren(const QModelIndex &parent) const Q_DECL_OVERRIDE;
          Qt::ItemFlags flags(const QModelIndex &index) const Q_DECL_OVERRIDE;

      private:

          struct Node
          {
              Node(Node *parent = 0) : parent(parent), children(0) {}
              ~Node() { delete children; }
              Node *parent;
              QVector<Node> *children;
          };

          Node *node(int row, Node *parent) const;
          Node *parent(Node *child) const;
          int row(Node *node) const;

          QIcon services;
          int rc;
          int cc;
          QVector<Node> *tree;
          QFileIconProvider iconProvider;
      };

      #endif // MODEL_H