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#pragma once
#include <functional>
#include <string>
#include "Event.h"
namespace crepe {
/**
* \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.
*
* Returning \c false from an event handler results in the event being propogated to other listeners for the same event type, while returning \c true stops propogation altogether.
*/
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
*/
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);
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);
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;
//! The event handler function.
EventHandler<EventType> handler;
};
} // namespace crepe
#include "EventHandler.hpp"
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