void CefRenderWidgetHostViewOSR::SendMouseWheelEvent()

in libcef/browser/osr/render_widget_host_view_osr.cc [1172:1247]
66 lines of code
13 McCabe index (conditional complexity)

void CefRenderWidgetHostViewOSR::SendMouseWheelEvent(
    const blink::WebMouseWheelEvent& event) {
  TRACE_EVENT0("cef", "CefRenderWidgetHostViewOSR::SendMouseWheelEvent");

  if (!IsPopupWidget()) {
    if (browser_impl_.get())
      browser_impl_->CancelContextMenu();

    if (popup_host_view_) {
      if (popup_host_view_->popup_position_.Contains(
              event.PositionInWidget().x(), event.PositionInWidget().y())) {
        blink::WebMouseWheelEvent popup_mouse_wheel_event(event);
        popup_mouse_wheel_event.SetPositionInWidget(
            event.PositionInWidget().x() -
                popup_host_view_->popup_position_.x(),
            event.PositionInWidget().y() -
                popup_host_view_->popup_position_.y());
        popup_mouse_wheel_event.SetPositionInScreen(
            popup_mouse_wheel_event.PositionInWidget().x(),
            popup_mouse_wheel_event.PositionInWidget().y());

        popup_host_view_->SendMouseWheelEvent(popup_mouse_wheel_event);
        return;
      } else {
        // Scrolling outside of the popup widget so destroy it.
        // Execute asynchronously to avoid deleting the widget from inside
        // some other callback.
        CEF_POST_TASK(
            CEF_UIT,
            base::BindOnce(&CefRenderWidgetHostViewOSR::CancelWidget,
                           popup_host_view_->weak_ptr_factory_.GetWeakPtr()));
      }
    } else if (!guest_host_views_.empty()) {
      for (auto guest_host_view : guest_host_views_) {
        if (!guest_host_view->render_widget_host_ ||
            !guest_host_view->render_widget_host_->GetView()) {
          continue;
        }
        const gfx::Rect& guest_bounds =
            guest_host_view->render_widget_host_->GetView()->GetViewBounds();
        if (guest_bounds.Contains(event.PositionInWidget().x(),
                                  event.PositionInWidget().y())) {
          blink::WebMouseWheelEvent guest_mouse_wheel_event(event);
          guest_mouse_wheel_event.SetPositionInWidget(
              event.PositionInWidget().x() - guest_bounds.x(),
              event.PositionInWidget().y() - guest_bounds.y());
          guest_mouse_wheel_event.SetPositionInScreen(
              guest_mouse_wheel_event.PositionInWidget().x(),
              guest_mouse_wheel_event.PositionInWidget().y());

          guest_host_view->SendMouseWheelEvent(guest_mouse_wheel_event);
          return;
        }
      }
    }
  }

  if (render_widget_host_ && render_widget_host_->GetView()) {
    blink::WebMouseWheelEvent mouse_wheel_event(event);

    mouse_wheel_phase_handler_.SendWheelEndForTouchpadScrollingIfNeeded(false);
    mouse_wheel_phase_handler_.AddPhaseIfNeededAndScheduleEndEvent(
        mouse_wheel_event, false);

    if (ShouldRouteEvents()) {
      render_widget_host_->delegate()
          ->GetInputEventRouter()
          ->RouteMouseWheelEvent(
              this, const_cast<blink::WebMouseWheelEvent*>(&mouse_wheel_event),
              ui::LatencyInfo(ui::SourceEventType::WHEEL));
    } else {
      render_widget_host_->GetView()->ProcessMouseWheelEvent(
          mouse_wheel_event, ui::LatencyInfo(ui::SourceEventType::WHEEL));
    }
  }
}