From efdce672123284847bd7fb6f12ac1ec96f28f3ef Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 7 Nov 2018 21:40:04 +0800
Subject: Make all header *.hpp .

---
 src/cru_event.hpp | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/cru_event.hpp

(limited to 'src/cru_event.hpp')

diff --git a/src/cru_event.hpp b/src/cru_event.hpp
new file mode 100644
index 00000000..76a36b22
--- /dev/null
+++ b/src/cru_event.hpp
@@ -0,0 +1,86 @@
+#pragma once
+
+#include <type_traits>
+#include <functional>
+#include <unordered_map>
+
+#include "base.hpp"
+
+namespace cru {
+	//Base class of all event args.
+	class BasicEventArgs : public Object
+	{
+	public:
+		explicit BasicEventArgs(Object* sender)
+            : sender_(sender)
+		{
+		    
+		}
+	    BasicEventArgs(const BasicEventArgs& other) = default;
+	    BasicEventArgs(BasicEventArgs&& other) = default;
+	    BasicEventArgs& operator=(const BasicEventArgs& other) = default;
+	    BasicEventArgs& operator=(BasicEventArgs&& other) = default;
+		~BasicEventArgs() override = default;
+
+		//Get the sender of the event.
+		Object* GetSender() const
+		{
+            return sender_;
+		}
+
+	private:
+		Object* sender_;
+	};
+
+
+	//A non-copyable non-movable Event class.
+	//It stores a list of event handlers.
+	//TArgsType must be subclass of BasicEventArgs.
+    template<typename TArgsType>
+    class Event
+	{
+    public:
+		static_assert(std::is_base_of_v<BasicEventArgs, TArgsType>,
+			"TArgsType must be subclass of BasicEventArgs.");
+
+
+        using ArgsType = TArgsType;
+        using EventHandler = std::function<void(ArgsType&)>;
+        using EventHandlerToken = long;
+
+        Event() = default;
+        Event(const Event&) = delete;
+        Event& operator = (const Event&) = delete;
+        Event(Event&&) = delete;
+        Event& operator = (Event&&) = delete;
+        ~Event() = default;
+
+        EventHandlerToken AddHandler(const EventHandler& handler)
+		{
+            const auto token = current_token_++;
+		    handlers_.emplace(token, handler);
+            return token;
+		}
+
+		void RemoveHandler(const EventHandlerToken token) {
+			auto find_result = handlers_.find(token);
+			if (find_result != handlers_.cend())
+				handlers_.erase(find_result);
+		}
+
+		void Raise(ArgsType& args) {
+			for (const auto& handler : handlers_)
+				(handler.second)(args);
+		}
+
+        bool IsNoHandler() const
+		{
+		    return handlers_.empty();
+		}
+
+    private:
+        std::unordered_map<EventHandlerToken, EventHandler> handlers_;
+
+        EventHandlerToken current_token_ = 0;
+    };
+}
-- 
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