void RootView::HandleKeyEvent()

in shell/browser/ui/views/root_view.cc [111:160]
37 lines of code
17 McCabe index (conditional complexity)

void RootView::HandleKeyEvent(const content::NativeWebKeyboardEvent& event) {
  if (!menu_bar_)
    return;

  // Show accelerator when "Alt" is pressed.
  if (menu_bar_visible_ && IsAltKey(event))
    menu_bar_->SetAcceleratorVisibility(
        event.GetType() == blink::WebInputEvent::Type::kRawKeyDown);

  // Show the submenu when "Alt+Key" is pressed.
  if (event.GetType() == blink::WebInputEvent::Type::kRawKeyDown &&
      event.windows_key_code >= ui::VKEY_A &&
      event.windows_key_code <= ui::VKEY_Z && IsAltModifier(event) &&
      menu_bar_->HasAccelerator(event.windows_key_code)) {
    if (!menu_bar_visible_) {
      SetMenuBarVisibility(true);

      View* focused_view = GetFocusManager()->GetFocusedView();
      last_focused_view_tracker_->SetView(focused_view);
      menu_bar_->RequestFocus();
    }

    menu_bar_->ActivateAccelerator(event.windows_key_code);
    return;
  }

  // Toggle the menu bar only when a single Alt is released.
  if (event.GetType() == blink::WebInputEvent::Type::kRawKeyDown &&
      IsAltKey(event)) {
    // When a single Alt is pressed:
    menu_bar_alt_pressed_ = true;
  } else if (event.GetType() == blink::WebInputEvent::Type::kKeyUp &&
             IsAltKey(event) && menu_bar_alt_pressed_) {
    // When a single Alt is released right after a Alt is pressed:
    menu_bar_alt_pressed_ = false;
    if (menu_bar_autohide_)
      SetMenuBarVisibility(!menu_bar_visible_);

    View* focused_view = GetFocusManager()->GetFocusedView();
    last_focused_view_tracker_->SetView(focused_view);
    if (menu_bar_visible_) {
      menu_bar_->RequestFocus();
      // Show accelerators when menu bar is focused
      menu_bar_->SetAcceleratorVisibility(true);
    }
  } else {
    // When any other keys except single Alt have been pressed/released:
    menu_bar_alt_pressed_ = false;
  }
}