Magic_Game/src/kiwano/core/event/Event.h

// Copyright (c) 2016-2018 Kiwano - Nomango
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF 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 <kiwano/core/event/EventType.h>
#include <kiwano/math/math.h>
#include <kiwano/core/keys.h>

namespace kiwano
{
	/**
	* \~chinese
	* \defgroup Events <EFBFBD>¼<EFBFBD>
	*/

	/**
	* \addtogroup Events
	* @{
	*/

	/// \~chinese
	/// @brief <20>¼<EFBFBD>
	class KGE_API Event
	{
	public:
		/// \~chinese
		/// @brief <20><><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD>
		Event(EventType const& type);

		virtual ~Event();

		/// \~chinese
		/// @brief <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD>
		const EventType& GetType() const;

		/// \~chinese
		/// @brief <20>ж<EFBFBD><D0B6>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD>
		/// @return <20>Ƿ<EFBFBD><C7B7><EFBFBD>ָ<EFBFBD><D6B8><EFBFBD>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD>
		template <
			typename _Ty,
			typename = typename std::enable_if<std::is_base_of<Event, _Ty>::value, int>::type
		>
		bool IsType() const;

		/// \~chinese
		/// @brief <20><>ȫת<C8AB><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD>
		/// @throw std::bad_cast <20><><EFBFBD><EFBFBD><EFBFBD>޷<EFBFBD>ת<EFBFBD><D7AA>ʱ<EFBFBD>׳<EFBFBD>
		template <
			typename _Ty,
			typename = typename std::enable_if<std::is_base_of<Event, _Ty>::value, int>::type
		>
		const _Ty& SafeCast() const;

		/// \~chinese
		/// @brief <20><>ȫת<C8AB><D7AA>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¼<EFBFBD>
		/// @throw std::bad_cast <20><><EFBFBD><EFBFBD><EFBFBD>޷<EFBFBD>ת<EFBFBD><D7AA>ʱ<EFBFBD>׳<EFBFBD>
		template <
			typename _Ty,
			typename = typename std::enable_if<std::is_base_of<Event, _Ty>::value, int>::type
		>
		_Ty& SafeCast();

	private:
		const EventType type_;
	};

	/// \~chinese
	/// @brief <20>¼<EFBFBD><C2BC><EFBFBD><EFBFBD>ԣ<EFBFBD><D4A3>ж<EFBFBD><D0B6>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD>
	template <typename _Ty>
	struct IsEvent : public std::bool_constant<std::is_base_of<Event, _Ty>::value || std::is_same<Event, _Ty>::value>
	{
	};

	/// \~chinese
	/// @brief <20>¼<EFBFBD><C2BC><EFBFBD><EFBFBD>ԣ<EFBFBD><D4A3>ж<EFBFBD><D0B6>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD>¼<EFBFBD><C2BC><EFBFBD><EFBFBD><EFBFBD>
	template <typename _Ty, typename = typename std::enable_if<IsEvent<_Ty>::value, int>::type>
	struct IsEventType
	{
		inline bool operator()(const Event& evt) const
		{
			return evt.GetType() == KGE_EVENT(_Ty);
		}
	};

	/** @} */

	inline const EventType& Event::GetType() const
	{
		return type_;
	}

	template <typename _Ty, typename>
	inline bool Event::IsType() const
	{
		return kiwano::IsEventType<_Ty>()(*this);
	}

	template <typename _Ty, typename>
	inline const _Ty& Event::SafeCast() const
	{
		if (!IsType<_Ty>())
			throw std::bad_cast();
		return dynamic_cast<const _Ty&>(*this);
	}

	template <typename _Ty, typename>
	inline _Ty& Event::SafeCast()
	{
		return const_cast<_Ty&>(const_cast<const Event*>(this)->SafeCast<_Ty>());
	}

}