123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
// Copyright (c) 2016-2018 Kiwano - Nomango
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#pragma once
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#include <kiwano/core/SmartPtr.hpp>
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#include <kiwano/core/event/EventType.h>
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#include <kiwano/math/Math.h>
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namespace kiwano
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{
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KGE_DECLARE_SMART_PTR(Event);
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/**
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* \~chinese
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* \defgroup Events 事件
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*/
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/**
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* \addtogroup Events
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* @{
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*/
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/// \~chinese
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/// @brief 事件
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class KGE_API Event : public RefCounter
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{
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public:
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/// \~chinese
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/// @brief 构造事件
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Event(const EventType& type);
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virtual ~Event();
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/// \~chinese
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/// @brief 获取类型事件
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const EventType& GetType() const;
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/// \~chinese
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/// @brief 判断事件类型
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/// @return 是否是指定事件类型
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template <typename _Ty, typename = typename std::enable_if<std::is_base_of<Event, _Ty>::value, int>::type>
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bool IsType() const;
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/// \~chinese
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/// @brief 安全转换为其他类型事件
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/// @throw std::bad_cast 类型无法转换时抛出
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template <typename _Ty, typename = typename std::enable_if<std::is_base_of<Event, _Ty>::value, int>::type>
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const _Ty* SafeCast() const;
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/// \~chinese
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/// @brief 安全转换为其他类型事件
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/// @throw std::bad_cast 类型无法转换时抛出
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template <typename _Ty, typename = typename std::enable_if<std::is_base_of<Event, _Ty>::value, int>::type>
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_Ty* SafeCast();
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private:
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const EventType type_;
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};
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/// \~chinese
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/// @brief 事件特性：判断指定类型是否是事件
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template <typename _Ty>
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struct IsEvent : public std::bool_constant<std::is_base_of<Event, _Ty>::value || std::is_same<Event, _Ty>::value>
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{
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};
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/// \~chinese
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/// @brief 事件特性：判断一个事件能否安全转换到另一事件类型
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template <typename _Ty, typename = typename std::enable_if<IsEvent<_Ty>::value, int>::type>
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struct IsEventType
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{
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inline bool operator()(const Event* evt) const
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{
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return evt->GetType() == KGE_EVENT(_Ty);
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}
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};
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/** @} */
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inline const EventType& Event::GetType() const
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{
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return type_;
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}
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template <typename _Ty, typename>
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inline bool Event::IsType() const
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{
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return kiwano::IsEventType<_Ty>()(this);
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}
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template <typename _Ty, typename>
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inline const _Ty* Event::SafeCast() const
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{
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return const_cast<Event*>(this)->SafeCast<_Ty>();
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}
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template <typename _Ty, typename>
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inline _Ty* Event::SafeCast()
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{
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if (!IsType<_Ty>())
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throw std::bad_cast();
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return dynamic_cast<_Ty*>(this);
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}
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} // namespace kiwano
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