| // 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_BASE_PREDICTION_EMPTY_PREDICTOR_H_ |
| #define UI_BASE_PREDICTION_EMPTY_PREDICTOR_H_ |
| |
| #include "base/component_export.h" |
| #include "base/optional.h" |
| #include "ui/base/prediction/input_predictor.h" |
| |
| namespace ui { |
| |
| // An empty predictor class. This will not generate any prediction. |
| class COMPONENT_EXPORT(UI_BASE_PREDICTION) EmptyPredictor |
| : public InputPredictor { |
| public: |
| EmptyPredictor(); |
| ~EmptyPredictor() override; |
| |
| const char* GetName() const override; |
| |
| void Reset() override; |
| |
| // store the cur_input in last_input_ |
| void Update(const InputData& cur_input) override; |
| |
| // Always returns false; |
| bool HasPrediction() const override; |
| |
| // Returns the last_input_ for testing. |
| std::unique_ptr<InputData> GeneratePrediction( |
| base::TimeTicks predict_time, |
| base::TimeDelta frame_interval) override; |
| |
| // Returns kTimeInterval for testing. |
| base::TimeDelta TimeInterval() const override; |
| |
| private: |
| // store the last_input_ point for testing |
| base::Optional<InputData> last_input_; |
| |
| DISALLOW_COPY_AND_ASSIGN(EmptyPredictor); |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_BASE_PREDICTION_EMPTY_PREDICTOR_H_ |