text: #pragma once
  
  #include <LibCore/CElapsedTimer.h>
  #include <LibGUI/GEvent.h>
  #include <LibGUI/GShortcut.h>
  #include <LibCore/CObject.h>
  #include <SharedGraphics/Rect.h>
  #include <SharedGraphics/Color.h>
  #include <SharedGraphics/Font.h>
  #include <AK/Badge.h>
  #include <AK/AKString.h>
  #include <AK/HashMap.h>
  
  class GraphicsBitmap;
  class GAction;
  class GLayout;
  class GMenu;
  class GWindow;
  
  enum class SizePolicy { Fixed, Fill };
  enum class Orientation { Horizontal, Vertical };
  enum class HorizontalDirection { Left, Right };
  enum class VerticalDirection { Up, Down };
  
  class GWidget : public CObject {
  public:
      explicit GWidget(GWidget* parent = nullptr);
      virtual ~GWidget() override;
  
      GLayout* layout() { return m_layout.ptr(); }
      void set_layout(OwnPtr<GLayout>&&);
  
      SizePolicy horizontal_size_policy() const { return m_horizontal_size_policy; }
      SizePolicy vertical_size_policy() const { return m_vertical_size_policy; }
      SizePolicy size_policy(Orientation orientation) { return orientation == Orientation::Horizontal ? m_horizontal_size_policy : m_vertical_size_policy; }
      void set_size_policy(SizePolicy horizontal_policy, SizePolicy vertical_policy);
  
      Size preferred_size() const { return m_preferred_size; }
      void set_preferred_size(const Size&);
  
      bool has_tooltip() const { return !m_tooltip.is_empty(); }
      String tooltip() const { return m_tooltip; }
      void set_tooltip(const String& tooltip) { m_tooltip = tooltip; }
  
      bool is_enabled() const { return m_enabled; }
      void set_enabled(bool);
  
      bool updates_enabled() const { return m_updates_enabled; }
      void set_updates_enabled(bool);
  
      virtual void event(CEvent&) override;
      virtual void paint_event(GPaintEvent&);
      virtual void resize_event(GResizeEvent&);
      virtual void show_event(GShowEvent&);
      virtual void hide_event(GHideEvent&);
      virtual void keydown_event(GKeyEvent&);
      virtual void keyup_event(GKeyEvent&);
      virtual void mousemove_event(GMouseEvent&);
      virtual void mousedown_event(GMouseEvent&);
      virtual void mouseup_event(GMouseEvent&);
      virtual void mousewheel_event(GMouseEvent&);
      virtual void click_event(GMouseEvent&);
      virtual void doubleclick_event(GMouseEvent&);
      virtual void context_menu_event(GContextMenuEvent&);
      virtual void focusin_event(CEvent&);
      virtual void focusout_event(CEvent&);
      virtual void enter_event(CEvent&);
      virtual void leave_event(CEvent&);
      virtual void child_event(CChildEvent&) override;
      virtual void change_event(GEvent&);
  
      // This is called after children have been painted.
      virtual void second_paint_event(GPaintEvent&);
  
      Rect relative_rect() const { return m_relative_rect; }
      Point relative_position() const { return m_relative_rect.location(); }
  
      Rect window_relative_rect() const;
      Rect screen_relative_rect() const;
  
      int x() const { return m_relative_rect.x(); }
      int y() const { return m_relative_rect.y(); }
      int width() const { return m_relative_rect.width(); }
      int height() const { return m_relative_rect.height(); }
  
      Rect rect() const { return { 0, 0, width(), height() }; }
      Size size() const { return m_relative_rect.size(); }
  
      void update();
      void update(const Rect&);
  
      virtual bool accepts_focus() const { return false; }
  
      bool is_focused() const;
      void set_focus(bool);
  
      struct HitTestResult {
          GWidget* widget { nullptr };
          Point local_position;
      };
      HitTestResult hit_test(const Point&);
      GWidget* child_at(const Point&) const;
  
      virtual const char* class_name() const override { return "GWidget"; }
  
      void set_relative_rect(const Rect&);
      void set_relative_rect(int x, int y, int width, int height) { set_relative_rect({ x, y, width, height }); }
  
      void set_x(int x) { set_relative_rect(x, y(), width(), height()); }
      void set_y(int y) { set_relative_rect(x(), y, width(), height()); }
      void set_width(int width) { set_relative_rect(x(), y(), width, height()); }
      void set_height(int height) { set_relative_rect(x(), y(), width(), height); }
  
      void move_to(const Point& point) { set_relative_rect({ point, relative_rect().size() }); }
      void move_to(int x, int y) { move_to({ x, y }); }
      void resize(const Size& size) { set_relative_rect({ relative_rect().location(), size }); }
      void resize(int width, int height) { resize({ width, height }); }
  
      void move_by(int x, int y) { move_by({ x, y }); }
      void move_by(const Point& delta) { set_relative_rect({ relative_position().translated(delta), size() }); }
  
      Color background_color() const { return m_background_color; }
      Color foreground_color() const { return m_foreground_color; }
  
      void set_background_color(Color color) { m_background_color = color; }
      void set_foreground_color(Color color) { m_foreground_color = color; }
  
      GWindow* window()
      {
          if (auto* pw = parent_widget())
              return pw->window();
          return m_window;
      }
  
      const GWindow* window() const
      {
          if (auto* pw = parent_widget())
              return pw->window();
          return m_window;
      }
  
      void set_window(GWindow*);
  
      GWidget* parent_widget()
      {
          if (parent() && parent()->is_widget())
              return static_cast<GWidget*>(parent());
          return nullptr;
      }
      const GWidget* parent_widget() const
      {
          if (parent() && parent()->is_widget())
              return static_cast<const GWidget*>(parent());
          return nullptr;
      }
  
      void set_fill_with_background_color(bool b) { m_fill_with_background_color = b; }
      bool fill_with_background_color() const { return m_fill_with_background_color; }
  
      const Font& font() const { return *m_font; }
      void set_font(RetainPtr<Font>&&);
  
      void set_global_cursor_tracking(bool);
      bool global_cursor_tracking() const;
  
      void notify_layout_changed(Badge<GLayout>);
      void invalidate_layout();
  
      bool is_visible() const { return m_visible; }
      void set_visible(bool);
  
      bool spans_entire_window_horizontally() const;
  
      bool is_greedy_for_hits() const { return m_greedy_for_hits; }
      void set_greedy_for_hits(bool b) { m_greedy_for_hits = b; }
  
      void move_to_front();
      void move_to_back();
  
      bool is_frontmost() const;
      bool is_backmost() const;
  
      GAction* action_for_key_event(const GKeyEvent&);
  
      void register_local_shortcut_action(Badge<GAction>, GAction&);
      void unregister_local_shortcut_action(Badge<GAction>, GAction&);
  
      virtual bool is_radio_button() const { return false; }
  
  private:
      virtual bool is_widget() const final { return true; }
  
      void handle_paint_event(GPaintEvent&);
      void handle_resize_event(GResizeEvent&);
      void handle_mousedown_event(GMouseEvent&);
      void handle_mousedoubleclick_event(GMouseEvent&);
      void handle_mouseup_event(GMouseEvent&);
      void handle_enter_event(CEvent&);
      void handle_leave_event(CEvent&);
      void do_layout();
      void focus_previous_widget();
      void focus_next_widget();
  
      GWindow* m_window { nullptr };
      OwnPtr<GLayout> m_layout;
  
      Rect m_relative_rect;
      Color m_background_color;
      Color m_foreground_color;
      RetainPtr<Font> m_font;
      String m_tooltip;
  
      SizePolicy m_horizontal_size_policy { SizePolicy::Fill };
      SizePolicy m_vertical_size_policy { SizePolicy::Fill };
      Size m_preferred_size;
  
      bool m_fill_with_background_color { false };
      bool m_visible { true };
      bool m_greedy_for_hits { false };
      bool m_enabled { true };
      bool m_layout_dirty { false };
      bool m_updates_enabled { true };
  
      HashMap<GShortcut, GAction*> m_local_shortcut_actions;
  };
  