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#pragma once
#include "Event.h"
#include <functional>
#include <iostream>
#include <typeindex>
/**
* \brief A type alias for an event handler function.
*
* The EventHandler is a std::function that takes an EventType reference and returns a boolean value
* indicating whether the event is handled.
*
* \tparam EventType The type of event this handler will handle.
*/
// TODO: typedef
template <typename EventType>
using EventHandler = std::function<bool(const EventType & e)>;
/**
* \class IEventHandlerWrapper
* \brief An abstract base class for event handler wrappers.
*
* This class provides the interface for handling events. Derived classes must implement the
* `call()` method to process events and the `get_type()` method to return the handler's type.
*/
class IEventHandlerWrapper {
public:
/**
* \brief Virtual destructor for IEventHandlerWrapper.
*/
virtual ~IEventHandlerWrapper() = default;
/**
* \brief Executes the handler with the given event.
*
* This method calls the `call()` method of the derived class, passing the event to the handler.
*
* \param e The event to be processed.
* \return A boolean value indicating whether the event is handled.
*/
bool exec(const Event & e);
/**
* \brief Get the type of the event handler.
*
* This method returns the type of the event handler as a string.
*
* \return A string representing the handler's type.
*/
virtual std::string get_type() const = 0;
private:
/**
* \brief The method responsible for handling the event.
*
* This method is implemented by derived classes to process the event.
*
* \param e The event to be processed.
* \return A boolean value indicating whether the event is handled.
*/
virtual bool call(const Event & e) = 0;
};
/**
* \class EventHandlerWrapper
* \brief A wrapper for event handler functions.
*
* This class wraps an event handler function of a specific event type. It implements the
* `call()` and `get_type()` methods to allow the handler to be executed and its type to be
* queried.
*
* \tparam EventType The type of event this handler will handle.
*/
template <typename EventType>
class EventHandlerWrapper : public IEventHandlerWrapper {
public:
/**
* \brief Constructs an EventHandlerWrapper with a given handler.
*
* The constructor takes an event handler function and stores it in the wrapper.
*
* \param handler The event handler function.
*/
explicit EventHandlerWrapper(const EventHandler<EventType> & handler)
: m_handler(handler), m_handler_type(m_handler.target_type().name()) {}
private:
/**
* \brief Calls the stored event handler with the event.
*
* This method casts the event to the appropriate type and calls the handler.
*
* \param e The event to be handled.
* \return A boolean value indicating whether the event is handled.
*/
bool call(const Event & e) override {
return m_handler(static_cast<const EventType &>(e));
}
/**
* \brief Returns the type of the handler.
*
* This method returns a string representing the type of the event handler.
*
* \return The handler type as a string.
*/
std::string get_type() const override { return m_handler_type; }
//! The event handler function.
EventHandler<EventType> m_handler;
//! The type name of the handler function.
const std::string m_handler_type;
};
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