lambdaeventfilter.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 <type_traits>
#include <QObject>
#include "typegetter.h"
 
namespace LC
{
namespace Util
{
    namespace detail
    {
        template<typename F>
        class LambdaEventFilter : public QObject
        {
            const F F_;
 
            using EventType_t = std::remove_pointer_t<std::decay_t<ArgType_t<F, 0>>>;
        public:
            LambdaEventFilter (F&& f, QObject *parent = nullptr)
            : QObject { parent }
            , F_ { std::move (f) }
            {
            }
 
            bool eventFilter (QObject*, QEvent *srcEv) override
            {
                const auto ev = dynamic_cast<EventType_t*> (srcEv);
                if (!ev)
                    return false;
 
                return F_ (ev);
            }
        };
    }
 
    template<typename F>
    auto MakeLambdaEventFilter (F&& f, QObject *parent = nullptr)
    {
        return new detail::LambdaEventFilter<std::decay_t<F>> { std::forward<F> (f), parent };
    }
}
}