| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_OBSERVER_H_ |
| #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_OBSERVER_H_ |
| |
| #include "base/observer_list_types.h" |
| #include "ui/events/events_export.h" |
| #include "ui/events/gestures/gesture_types.h" |
| |
| namespace ui { |
| |
| class EVENTS_EXPORT GestureRecognizerObserver : public base::CheckedObserver { |
| public: |
| virtual void OnActiveTouchesCanceledExcept( |
| GestureConsumer* not_cancelled) = 0; |
| virtual void OnEventsTransferred( |
| GestureConsumer* current_consumer, |
| GestureConsumer* new_consumer, |
| TransferTouchesBehavior transfer_touches_behavior) = 0; |
| virtual void OnActiveTouchesCanceled(GestureConsumer* consumer) = 0; |
| |
| protected: |
| ~GestureRecognizerObserver() override; |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_OBSERVER_H_ |