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// 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 "third_party/abseil-cpp/absl/types/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
absl::optional<InputData> last_input_;
DISALLOW_COPY_AND_ASSIGN(EmptyPredictor);
};
} // namespace ui
#endif // UI_BASE_PREDICTION_EMPTY_PREDICTOR_H_