dispatch.hpp

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#pragma once
#include "le2d/input/listener.hpp"
#include <gsl/pointers>
#include <vector>
 
namespace le::input {
class Dispatch {
  public:
    Dispatch(Dispatch const&) = delete;
    auto operator=(Dispatch const&) = delete;
 
    Dispatch() = default;
    Dispatch(Dispatch&& rhs) noexcept;
    auto operator=(Dispatch&& rhs) noexcept -> Dispatch&;
    ~Dispatch();
 
    void attach(gsl::not_null<Listener*> listener);
    void detach(gsl::not_null<Listener*> listener);
 
    void on_cursor_move(glm::vec2 pos);
    void on_codepoint(event::Codepoint codepoint);
    void on_key(event::Key const& key);
    void on_mouse_button(event::MouseButton const& button);
    void on_scroll(event::Scroll const& scroll);
    void on_drop(event::Drop const& drop);
 
    void handle_events(glm::ivec2 framebuffer_size, std::span<le::Event const> events);
    void disengage_all();
 
    bool honor_imgui_want_capture{true};
 
  private:
    enum class Type : std::int8_t { None, Keyboard, Mouse };
 
    void update_listeners(Dispatch* target) const;
 
    template <typename FPtr, typename T>
    void dispatch(FPtr fptr, T const& event, Type type) const;
 
    std::vector<Listener*> m_listeners{};
};
} // namespace le::input