i_backend_system.h

Go to the documentation of this file.

#pragma once
 
#include <engine/core/events/system_event.h>
 
#include <functional>
#include <string>
#include <unordered_map>
#include <vector>
 
using BackendCallback = std::function<void(void* event_data)>;
 
class IBackendSystem {
 public:
  virtual ~IBackendSystem() = default;
 
  virtual void initialize_listeners(
      std::unordered_map<SystemEvent, std::vector<BackendCallback>>*
          listeners) = 0;
 
  virtual void poll_events() = 0;
 
  virtual void init_frame_timer() = 0;
 
  virtual void update_frame_time(float time_scale) = 0;
 
  [[nodiscard]] virtual float delta_time() const = 0;
 
  [[nodiscard]] virtual float frames_per_second() const = 0;
 
  [[nodiscard]] virtual std::string get_clipboard_text() = 0;
 
  virtual void set_cursor_to_arrow() = 0;
 
  virtual void set_cursor_to_hand() = 0;
 
  virtual void set_cursor_to_ibeam() = 0;
 
  virtual void set_cursor_to_crosshair() = 0;
 
  virtual void set_cursor_to_wait() = 0;
 
 protected:
  uint64_t last_{0};
  double freq_{0.0f};
  float delta_time_{0.0f};
 
  int frame_count_{0};
  float fps_{0.0f};
  float accumulated_time_{0.0f};
};