text: #include <LibGUI/GRadioButton.h>
  #include <LibGUI/GPainter.h>
  #include <SharedGraphics/GraphicsBitmap.h>
  
  static RetainPtr<GraphicsBitmap> s_unfilled_circle_bitmap;
  static RetainPtr<GraphicsBitmap> s_filled_circle_bitmap;
  static RetainPtr<GraphicsBitmap> s_changing_filled_circle_bitmap;
  static RetainPtr<GraphicsBitmap> s_changing_unfilled_circle_bitmap;
  
  GRadioButton::GRadioButton(const String& text, GWidget* parent)
      : GAbstractButton(text, parent)
  {
      if (!s_unfilled_circle_bitmap) {
          s_unfilled_circle_bitmap = GraphicsBitmap::load_from_file("/res/icons/unfilled-radio-circle.png");
          s_filled_circle_bitmap = GraphicsBitmap::load_from_file("/res/icons/filled-radio-circle.png");
          s_changing_filled_circle_bitmap = GraphicsBitmap::load_from_file("/res/icons/changing-filled-radio-circle.png");
          s_changing_unfilled_circle_bitmap = GraphicsBitmap::load_from_file("/res/icons/changing-unfilled-radio-circle.png");
      }
  }
  
  GRadioButton::~GRadioButton()
  {
  }
  
  Size GRadioButton::circle_size()
  {
      return s_unfilled_circle_bitmap->size();
  }
  
  static const GraphicsBitmap& circle_bitmap(bool checked, bool changing)
  {
      if (changing)
          return checked ? *s_changing_filled_circle_bitmap : *s_changing_unfilled_circle_bitmap;
      return checked ? *s_filled_circle_bitmap : *s_unfilled_circle_bitmap;
  }
  
  void GRadioButton::paint_event(GPaintEvent& event)
  {
      GPainter painter(*this);
      painter.add_clip_rect(event.rect());
  
      Rect circle_rect { { 2, 0 }, circle_size() };
      circle_rect.center_vertically_within(rect());
  
      auto& bitmap = circle_bitmap(is_checked(), is_being_pressed());
      painter.blit(circle_rect.location(), bitmap, bitmap.rect());
  
      Rect text_rect { circle_rect.right() + 4, 0, font().width(text()), font().glyph_height() };
      text_rect.center_vertically_within(rect());
      paint_text(painter, text_rect, font(), TextAlignment::TopLeft);
  }
  
  template<typename Callback>
  void GRadioButton::for_each_in_group(Callback callback)
  {
      if (!parent())
          return;
      for (auto& object : parent()->children()) {
          if (!object->is_widget())
              continue;
          if (!static_cast<GWidget*>(object)->is_radio_button())
              continue;
          callback(*static_cast<GRadioButton*>(object));
      }
  }
  
  void GRadioButton::click()
  {
      if (!is_enabled())
          return;
      for_each_in_group([this] (auto& button) {
          if (&button != this)
              button.set_checked(false);
      });
      set_checked(true);
  }
  