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#pragma once
#include <type_traits>
#include <list>
#include <memory>
#include <algorithm>
#include "base.h"
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 = Action<ArgsType&>;
using EventHandlerPtr = std::shared_ptr<EventHandler>;
Event() = default;
Event(const Event&) = delete;
Event& operator = (const Event&) = delete;
Event(Event&&) = delete;
Event& operator = (Event&&) = delete;
~Event() = default;
//Create a EventHandlerPtr from the given handler,
//add it to list and return it.
EventHandlerPtr AddHandler(EventHandler&& handler)
{
EventHandlerPtr ptr = std::make_shared<EventHandler>(std::move(handler));
handlers_.push_back(ptr);
return ptr;
}
void AddHandler(EventHandlerPtr handler) {
handlers_.push_back(handler);
}
void RemoveHandler(EventHandlerPtr handler) {
auto find_result = std::find(handlers_.cbegin(), handlers_.cend(), handler);
if (find_result != handlers_.cend())
handlers_.erase(find_result);
}
void Raise(ArgsType& args) {
for (auto ptr : handlers_)
(*ptr)(args);
}
private:
std::list<EventHandlerPtr> handlers_;
};
}
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