flatitemsmodel.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 "flatitemsmodeltypedbase.h"
 
namespace LC::Util
{
    namespace detail
    {
        template<typename T, typename... Ts>
        QVariant GetFieldImpl (int idx, T& head, Ts&... tail)
        {
            if (!idx)
                return head;
 
            if constexpr (sizeof... (Ts))
                return GetFieldImpl (idx - 1, tail...);
            else
                throw std::runtime_error { "out of bounds tuple-like access" };
        }
 
        template<typename T>
        QVariant GetField (const T& item, int idx)
        {
            auto&& [...elems] = item;
            return GetFieldImpl (idx, elems...);
        }
    }
 
    template<typename T>
    class FlatItemsModel : public FlatItemsModelTypedBase<T>
    {
    public:
        using FlatItemsModelTypedBase<T>::FlatItemsModelTypedBase;
    protected:
        QVariant GetData (int row, int col, int role) const override
        {
            if (role == this->DataRole)
                return QVariant::fromValue (this->Items_.at (row));
 
            if (role != Qt::DisplayRole)
                return {};
 
            return detail::GetField (this->Items_.at (row), col);
        }
    };
}