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#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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