Add basic Event class

openVulkanoCpp/Base/Event.hpp

@@ -0,0 +1,362 @@
+#pragma once
+
+#include <algorithm>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <shared_mutex>
+#include <vector>
+
+namespace openVulkanoCpp
+{
+	template<typename... Arguments>
+	class Event final
+	{
+	public:
+		typedef std::function<void(Arguments...)> Function;
+
+	private:
+		enum class EventHandlerType { STATIC, INSTANCED, INSTANCED_SHARED_PTR, INSTANCED_WEAK_PTR, FUNCTIONAL };
+
+		class EventHandler
+		{
+			const EventHandlerType type;
+		protected:
+			EventHandler(EventHandlerType type) : type(type) {}
+			virtual bool ShouldDelete(EventHandler* other) const = 0;
+
+		public:
+			virtual ~EventHandler() = default;
+
+			bool ShouldBeDelete(EventHandler* other) const
+			{
+				if (other == this) return true;
+				if (!other || other->type != type) return false;
+				return ShouldDelete(other);
+			}
+
+			virtual void Notify(Arguments... args) const = 0;
+		};
+
+		class StaticEventHandler final : public EventHandler
+		{
+		public:
+			typedef void (*Method)(Arguments...);
+
+			StaticEventHandler(Method method) : EventHandler(EventHandlerType::STATIC), method(method) {}
+
+			void Notify(Arguments... args) const override
+			{
+				method(args...);
+			}
+
+		protected:
+			bool ShouldDelete(EventHandler* other) const override
+			{
+				return static_cast<StaticEventHandler*>(other)->method == this->method;
+			}
+
+		private:
+			Method method;
+		};
+
+		template<class Instance, class Method>
+		class InstancedEventHandler final : public EventHandler
+		{
+		public:
+			InstancedEventHandler(Instance* instance, Method method) : EventHandler(EventHandlerType::INSTANCED), instance(instance), method(method) {}
+
+			void Notify(Arguments... args) const override
+			{
+				(instance->*method)(args...);
+			}
+
+		protected:
+			bool ShouldDelete(EventHandler* other) const override
+			{
+				InstancedEventHandler* otherHandler = static_cast<InstancedEventHandler*>(other);
+				return otherHandler->instance == instance && otherHandler->method == this->method;
+			}
+
+		private:
+			Instance* instance;
+			Method method;
+		};
+
+		template<class Instance, class Method>
+		class InstancedSharedPtrEventHandler final : public EventHandler
+		{
+		public:
+			InstancedSharedPtrEventHandler(std::shared_ptr<Instance> instance, Method method) : EventHandler(EventHandlerType::INSTANCED_SHARED_PTR), instance(instance), method(method) {}
+
+			void Notify(Arguments... args) const override
+			{
+				(instance.get()->*method)(args...);
+			}
+
+		protected:
+			bool ShouldDelete(EventHandler* other) const override
+			{
+				InstancedSharedPtrEventHandler* otherHandler = static_cast<InstancedSharedPtrEventHandler*>(other);
+				return otherHandler->instance == instance && otherHandler->method == this->method;
+			}
+
+		private:
+			std::shared_ptr<Instance> instance;
+			Method method;
+		};
+
+		template<class Instance, class Method>
+		class InstancedWeakPtrEventHandler final : public EventHandler
+		{
+		public:
+			InstancedWeakPtrEventHandler(std::weak_ptr<Instance> instance, Method method) : EventHandler(EventHandlerType::INSTANCED_WEAK_PTR), instance(instance), method(method) {}
+
+			void Notify(Arguments... args) const override
+			{
+				if (auto instancePtr = instance.lock())
+				{
+					(instancePtr.get()->*method)(args...);
+				}
+			}
+
+		protected:
+			bool ShouldDelete(EventHandler* other) const override
+			{
+				InstancedWeakPtrEventHandler* otherHandler = static_cast<InstancedWeakPtrEventHandler*>(other);
+				if (otherHandler->method == this->method)
+				{
+					if (auto ptr = instance.lock())
+					{
+						return ptr == otherHandler->instance.lock();
+					}
+					return true;
+				}
+				
+				return false;
+			}
+
+		private:
+			std::weak_ptr<Instance> instance;
+			Method method;
+		};
+
+		class FunctionalEventHandler final : public EventHandler
+		{
+		public:
+			FunctionalEventHandler(Function function) : EventHandler(EventHandlerType::FUNCTIONAL), function(function) {}
+
+			void Notify(Arguments... args) const override
+			{
+				function(args...);
+			}
+
+		protected:
+			bool ShouldDelete(EventHandler* other) const override
+			{
+				return false;
+			}
+
+		private:
+			Function function;
+		};
+
+		std::vector<EventHandler*> handlers;
+		mutable std::shared_mutex mutex;
+
+		void Remove(EventHandler* referenceHandler)
+		{
+			std::unique_lock<std::shared_mutex> lock(mutex);
+			for(size_t i = 0; i < handlers.size(); i++)
+			{
+				EventHandler* handler = handlers[i];
+				if (handler->ShouldBeDelete(referenceHandler))
+				{
+					size_t end = handlers.size() - 1;
+					if (i < end)
+					{
+						handlers[i] = handlers[end];
+					}
+					delete handler;
+					handlers.pop_back();
+				}
+			}
+		}
+
+		void Add(EventHandler* handler)
+		{
+			std::unique_lock<std::shared_mutex> lock(mutex);
+			handlers.push_back(handler);
+		}
+
+	public:
+		void NotifyAll(Arguments... args) const
+		{
+			std::shared_lock<std::shared_mutex> lock(mutex);
+			for(EventHandler* handler : handlers)
+			{
+				handler->Notify(args...);
+			}
+		}
+
+		void operator()(Arguments... args)
+		{
+			NotifyAll(args);
+		}
+
+		template<class Instance, class Method>
+		void RegisterHandler(Instance* instance, Method method)
+		{
+			Add(new InstancedEventHandler<Instance, Method>(instance, method));
+		}
+
+		template<class Instance, class Method>
+		void UnregisterHandler(Instance* instance, Method method)
+		{
+			auto handler = InstancedEventHandler<Instance, Method>(instance, method);
+	        Remove(&handler);
+		}
+
+		template<class Instance, class Method>
+	    void operator +=(std::pair<Instance*, Method> instancedMethodPair)
+		{
+	        RegisterHandler(instancedMethodPair.first, instancedMethodPair.second);
+	    }
+	    
+	    template<class Instance, class Method>
+	    void operator -=(std::pair<Instance*, Method> instancedMethodPair)
+		{
+			UnregisterHandler(instancedMethodPair.first, instancedMethodPair.second);
+	    }
+
+		template<class Instance, class Method>
+		void RegisterHandler(std::shared_ptr<Instance> instance, Method method)
+		{
+			Add(new InstancedSharedPtrEventHandler<Instance, Method>(instance, method));
+		}
+
+		template<class Instance, class Method>
+		void UnregisterHandler(std::shared_ptr<Instance> instance, Method method)
+		{
+			auto handler = InstancedSharedPtrEventHandler<Instance, Method>(instance, method);
+			Remove(&handler);
+		}
+
+		template<class Instance, class Method>
+		void operator +=(std::pair<std::shared_ptr<Instance>, Method> instancedMethodPair)
+		{
+			RegisterHandler(instancedMethodPair.first, instancedMethodPair.second);
+		}
+
+		template<class Instance, class Method>
+		void operator -=(std::pair<std::shared_ptr<Instance>, Method> instancedMethodPair)
+		{
+			UnregisterHandler(instancedMethodPair.first, instancedMethodPair.second);
+		}
+
+		template<class Instance, class Method>
+		void RegisterHandler(std::weak_ptr<Instance> instance, Method method)
+		{
+			Add(new InstancedWeakPtrEventHandler<Instance, Method>(instance, method));
+		}
+
+		template<class Instance, class Method>
+		void UnregisterHandler(std::weak_ptr<Instance> instance, Method method)
+		{
+			auto handler = InstancedWeakPtrEventHandler<Instance, Method>(instance, method);
+			Remove(&handler);
+		}
+
+		template<class Instance, class Method>
+		void RegisterHandlerWeak(std::weak_ptr<Instance> instance, Method method)
+		{
+			Add(new InstancedWeakPtrEventHandler<Instance, Method>(instance, method));
+		}
+
+		template<class Instance, class Method>
+		void UnregisterHandlerWeak(std::weak_ptr<Instance> instance, Method method)
+		{
+			auto handler = InstancedWeakPtrEventHandler<Instance, Method>(instance, method);
+			Remove(&handler);
+		}
+
+		template<class Instance, class Method>
+		void operator +=(std::pair<std::weak_ptr<Instance>, Method> instancedMethodPair)
+		{
+			RegisterHandlerWeak(instancedMethodPair.first, instancedMethodPair.second);
+		}
+
+		template<class Instance, class Method>
+		void operator -=(std::pair<std::weak_ptr<Instance>, Method> instancedMethodPair)
+		{
+			RegisterHandlerWeak(instancedMethodPair.first, instancedMethodPair.second);
+		}
+
+		void RegisterHandler(void (*method)(Arguments...))
+		{
+			handlers.push_back(new StaticEventHandler(method));
+		}
+
+		void UnregisterHandler(void (*method)(Arguments...))
+		{
+	        auto handler = StaticEventHandler(method);
+	        Remove(&handler);
+		}
+	    
+	    void operator +=(void (*method)(Arguments...))
+		{
+			RegisterHandler(method);
+	    }
+	    
+	    void operator -=(void (*method)(Arguments...))
+		{
+			UnregisterHandler(method);
+	    }
+
+		EventHandler* RegisterHandler(Function function)
+		{
+			FunctionalEventHandler* handler = new FunctionalEventHandler(function);
+			Add(handler);
+			return handler;
+		}
+
+		void UnregisterHandler(EventHandler* handler)
+		{
+			Remove(handler);
+		}
+	    
+	    EventHandler* operator +=(Function function)
+		{
+			return RegisterHandler(function);
+	    }
+	    
+	    void operator -=(EventHandler* handler)
+		{
+			Remove(handler);
+	    }
+	};
+
+	template<class Instance, class Method>
+	constexpr std::pair<Instance*, Method> EventHandler(Instance* instance, Method method)
+	{
+		return std::pair<Instance*, Method>(instance, method);
+	}
+
+	template<class Instance, class Method>
+	constexpr std::pair<std::shared_ptr<Instance>, Method> EventHandler(std::shared_ptr<Instance> instance, Method method)
+	{
+		return std::pair<std::shared_ptr<Instance>, Method>(instance, method);
+	}
+
+	template<class Instance, class Method>
+	constexpr std::pair<std::weak_ptr<Instance>, Method> EventHandler(std::weak_ptr<Instance> instance, Method method)
+	{
+		return std::pair<std::weak_ptr<Instance>, Method>(instance, method);
+	}
+
+	template<class Instance, class Method>
+	constexpr std::pair<std::weak_ptr<Instance>, Method> EventHandlerWeak(std::weak_ptr<Instance> instance, Method method)
+	{
+		return std::pair<std::weak_ptr<Instance>, Method>(instance, method);
+	}
+}

openVulkanoCpp/openVulkanoCpp.vcxproj

@@ -105,6 +105,7 @@ xcopy /y "$(ProjectDir)Shader\*.spv" "$(OutDir)\Shader\"</Command>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="Base\EngineConstants.hpp" />
+    <ClInclude Include="Base\Event.hpp" />
     <ClInclude Include="Base\ICloseable.hpp" />
     <ClInclude Include="Base\IGraphicsApp.hpp" />
     <ClInclude Include="Base\IGraphicsAppManager.hpp" />