ui_interactable.h

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#pragma once
 
#include <engine/public/ui/ui_object.h>
 
#include <functional>
#include <vector>
 
struct UIInteractionState {
  bool hovered = false;
  bool pressed = false;
  bool held = false;
  bool focused = false;
  bool disabled = false;
};
 
class UIInteractable : public UIObject {
 public:
  UIInteractable(Scene& scene, float width, float height, Point pivot,
                 Point anchor);
 
  void update_interaction(float dt);
 
  UIInteractionState& state();
  [[nodiscard]] const UIInteractionState& state() const;
 
  void disable();
  void enable();
 
  virtual void on_hover() {}
 
  virtual void on_unhover() {}
 
  virtual void on_press() {}
 
  virtual void on_release() {}
 
  virtual void on_hold() {}
 
  virtual void on_focus() {}
 
  virtual void on_unfocus() {}
 
  void add_on_hover(const std::function<void(UIInteractable&)>& handler);
  void add_on_unhover(const std::function<void(UIInteractable&)>& handler);
 
  void add_on_press(const std::function<void(UIInteractable&)>& handler);
  void add_on_release(const std::function<void(UIInteractable&)>& handler);
 
  void add_on_focus(const std::function<void(UIInteractable&)>& handler);
  void add_on_unfocus(const std::function<void(UIInteractable&)>& handler);
 
 protected:
  [[nodiscard]] bool in_range(const Point& mouse_pos) const;
 
  UIInteractionState interaction_state_;
 
  std::vector<std::function<void(UIInteractable&)>> on_hover_handlers_;
  std::vector<std::function<void(UIInteractable&)>> on_unhover_handlers_;
 
  std::vector<std::function<void(UIInteractable&)>> on_press_handlers_;
  std::vector<std::function<void(UIInteractable&)>> on_release_handlers_;
 
  std::vector<std::function<void(UIInteractable&)>> on_focus_handlers_;
  std::vector<std::function<void(UIInteractable&)>> on_unfocus_handlers_;
};