modeliterator.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <QModelIndex>
#include "modelsconfig.h"
 
namespace LC::Util
{
    class UTIL_MODELS_API ModelIterator
    {
        QAbstractItemModel * const Model_;
        const QModelIndex Parent_;
 
        int Row_;
        int Col_;
    public:
        enum class Direction
        {
            Rows,
 
            Cols
        };
    private:
        const Direction Dir_;
    public:
        ModelIterator (QAbstractItemModel *model, int row, int col = 0,
                Direction dir = Direction::Rows, const QModelIndex& parent = {});
 
        ModelIterator& operator++ ();
 
        ModelIterator operator++ (int);
 
        ModelIterator& operator-- ();
 
        ModelIterator operator-- (int);
 
        ModelIterator& operator+= (int count);
 
        ModelIterator& operator-= (int count);
 
        int operator- (const ModelIterator& other) const;
 
        friend UTIL_MODELS_API bool operator== (const ModelIterator& left, const ModelIterator& right);
 
        friend UTIL_MODELS_API bool operator!= (const ModelIterator& left, const ModelIterator& right);
 
        QModelIndex operator* () const;
 
        int GetRow () const;
 
        int GetCol () const;
    private:
        int& GetIncrementable ();
        int GetIncrementable () const;
    };
}
 
namespace std
{
    template<>
    struct iterator_traits<LC::Util::ModelIterator>
    {
        typedef QModelIndex value_type;
        typedef int difference_type;
 
        typedef random_access_iterator_tag iterator_category;
    };
}