Draggable.h

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//
// Draggable.h
//
 
#ifndef DRAGGABLE_H
#define DRAGGABLE_H
 
#pragma once
 
#include <Malena/Traits/Base/Customizable.h>
#include <Malena/Engine/Events/EventReceiver.h>
#include <Malena/Engine/Events/Fireable.h>
#include <Malena/Manifests/Manifest.h>
#include <SFML/Graphics.hpp>
#include <optional>
 
#include "Malena/Engine/Events/EventDispatcher.h"
 
namespace ml
{
    class DraggableManifest : public Manifest
    {
    public:
        enum class State
        {
            FREE,   
            LOCK_X, 
            LOCK_Y  
        };
 
        enum class Flag
        {
            DRAGGING 
        };
    };

    class Draggable : public EventReceiver,
                      public Customizable<DraggableManifest>
    {
    public:
        using Flag  = DraggableManifest::Flag;
        using State = DraggableManifest::State;
 
        Draggable() = default;
        virtual ~Draggable() = default;

        void setDragBounds(const sf::FloatRect& bounds);

        void clearDragBounds();
 
    private:
        sf::Vector2f                 _dragOffset;
        std::optional<sf::FloatRect> _dragBounds;
 
        friend class DraggableDispatcher;
    };

    class DraggableDispatcher : public EventDispatcher
    {
    public:
        bool occurred(const std::optional<sf::Event>& event) override;
        bool filter(const std::optional<sf::Event>& event, Core* component) override;
        void fire(const std::optional<sf::Event>& event) override;
    };
 
} // namespace ml
 
ML_EXPORT(DraggableDispatcher)
 
#endif // DRAGGABLE_H