CEF Forum

Our project requires forwarding touch events to the browser window via CEF api in non-osr mode.
It is not possible by default. There is a check in alloy_browser_host_impl.cc

Code: Select all

void AlloyBrowserHostImpl::SendTouchEvent(const CefTouchEvent& event) {
  if (!IsWindowless()) {
    DCHECK(false) << "Window rendering is not disabled";
    return;
  }
...


Removing this check makes that empty void CefBrowserPlatformDelegateNativeAura::SendTouchEvent(const CefTouchEvent& event){} is called.
I tried to implement this function to support touches and gestures in this way but it still does not work as real.

Code: Select all

void CefBrowserPlatformDelegateNativeAura::SendTouchEvent( const CefTouchEvent& event) {
auto view = GetHostView();

  gfx::Point location(event.x, event.y);

  base::TimeTicks time_stamp = GetEventTimeStamp();

  ui::PointerDetails pointer_details{ ui::EventPointerType::kTouch, event.id };//, event.radius_x, event.radius_y, event.pressure };
 
  ui::EventType event_type;
  if ( event.type == CEF_TET_PRESSED)
    event_type = ui::EventType::kTouchPressed;
  else if ( event.type == CEF_TET_MOVED)
    event_type = ui::EventType::kTouchMoved;
  else
    event_type = ui::EventType::kTouchReleased;

  ui::TouchEvent touch_event{event_type, location, time_stamp, pointer_details};

  // gestures

  ui::GestureRecognizer* gestureRecognizer = aura::Env::GetInstance()->gesture_recognizer();

  if (!gestureRecognizer)
    return;

  if (!window_widget_)
    return;

  aura::Window* window = window_widget_->GetNativeWindow();

  if (!window)
    return;

  if ( !gestureRecognizer->ProcessTouchEventPreDispatch( &touch_event, window ) )
    return;

  auto gestures = gestureRecognizer->AckTouchEvent( touch_event.unique_event_id(), ui::ER_UNHANDLED, false,  window );

  for(auto & g : gestures)
  {
    view->OnGestureEvent(g.get());
  }

  view->OnTouchEvent( &touch_event );
}


Is any better way to forward touch events?
BTW
In dev mode there is a simulation mode where mouse can simulate touch and it works great. I wish my implementation works so good as this.