modelitembase.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **********************************************************************/

#pragma once

#include <memory>
#include <QVector>

namespace LeechCraft
{
namespace Util
{
    template<typename T>
    class ModelItemBase : public std::enable_shared_from_this<T>
    {
    protected:
        using T_wptr = std::weak_ptr<T>;
        using T_ptr = std::shared_ptr<T>;
        using T_cptr = std::shared_ptr<const T>;
        using TList_t = QVector<T_ptr>;

        T_wptr Parent_;
        TList_t Children_;

        ModelItemBase () = default;

        ModelItemBase (const T_wptr& parent)
        : Parent_ { parent }
        {
        }
    public:
        using iterator = typename TList_t::iterator;

        using const_iterator = typename TList_t::const_iterator;

        iterator begin ()
        {
            return Children_.begin ();
        }

        iterator end ()
        {
            return Children_.end ();
        }

        const_iterator begin () const
        {
            return Children_.begin ();
        }

        const_iterator end () const
        {
            return Children_.end ();
        }

        T_ptr GetChild (int row) const
        {
            return Children_.value (row);
        }

        const TList_t& GetChildren () const
        {
            return Children_;
        }

        TList_t& GetChildren ()
        {
            return Children_;
        }

        int GetRowCount () const
        {
            return Children_.size ();
        }

        bool IsEmpty () const
        {
            return Children_.isEmpty ();
        }

        iterator EraseChild (iterator it)
        {
            return Children_.erase (it);
        }

        iterator EraseChildren (iterator begin, iterator end)
        {
            return Children_.erase (begin, end);
        }

        void AppendExisting (const T_ptr& t)
        {
            Children_ << t;
        }

        void AppendExisting (const TList_t& items)
        {
            Children_ += items;
        }

        template<typename... Args>
        T_ptr& AppendChild (Args&&... args)
        {
            Children_.append (std::make_shared<T> (std::forward<Args> (args)...));
            return Children_.last ();
        }

        template<typename... Args>
        T_ptr& InsertChild (int pos, Args&&... args)
        {
            Children_.insert (pos, std::make_shared<T> (std::forward<Args> (args)...));
            return Children_ [pos];
        }

        T_ptr GetParent () const
        {
            return Parent_.lock ();
        }

        int GetRow (const T_ptr& item) const
        {
            return Children_.indexOf (item);
        }

        int GetRow (const T_cptr& item) const
        {
            const auto pos = std::find (Children_.begin (), Children_.end (), item);
            return pos == Children_.end () ?
                    -1 :
                    std::distance (Children_.begin (), pos);
        }

        int GetRow () const
        {
            const auto parent = GetParent ();
            if (!parent)
                return -1;
            return parent->GetRow (this->shared_from_this ());
        }
    };
}
}