MouseInfo.hpp

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// Copyright 2025-2026 Jan Niklas Hasse <jhasse@bixense.com>
// For conditions of distribution and use, see copyright notice in LICENSE.txt
#pragma once
 
#include "Vec2.hpp"
 
#include <optional>
#include <span>
#include <vector>
 
namespace jngl {
 
class Mat3;
class Window;
 
class MouseInfo {
    struct Impl;
 
public:
    void transform(const jngl::Mat3& transformationMatrix);
 
    struct Down {
        Vec2 newPos() const;
        bool released();
 
        Vec2 startPos() const;
 
        Down(MouseInfo::Impl&, Vec2 objectPos);
        Down(const Down&) = delete;
        Down(Down&&) noexcept;
        Down& operator=(const Down&) = delete;
        Down& operator=(Down&&) noexcept;
        ~Down();
 
    private:
        MouseInfo::Impl* parent = nullptr;
        Vec2 startReference;
    };
 
    struct Over {
        Vec2 pos() const;
 
        std::optional<Down> pressed(Vec2 objectPos);
 
        explicit Over(MouseInfo::Impl&);
 
    private:
        MouseInfo::Impl& parent;
    };
 
    std::span<Over> cursors();
 
private:
    friend class jngl::Window;
 
    MouseInfo();
    ~MouseInfo();
    void setMousePos(Vec2);
 
    std::vector<Impl> impls;
    std::vector<Over> activeCursors;
};
 
MouseInfo& input();
 
} // namespace jngl