modelitembase.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 <memory>
#include <QVector>
 
namespace LC::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;
 
        explicit 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 ());
        }
    };
}