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#pragma once
#include "pre.hpp"
#include <functional>
#include <map>
#include <type_traits>
#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);
}
private:
std::map<EventHandlerToken, EventHandler> handlers_;
EventHandlerToken current_token_ = 0;
};
} // namespace cru
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