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/*
* Copyright 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <utils/Timers.h>
namespace android {
/**
* Controls a slop logic. Slop here refers to an approach to try and drop insignificant input
* events. This is helpful in cases where unintentional input events may cause unintended outcomes,
* like scrolling a screen or keeping the screen awake.
*
* Current slop logic:
* "If time since last event > Xns, then discard the next N values."
*/
class SlopController final {
public:
SlopController(float slopThreshold, nsecs_t slopDurationNanos);
/**
* Consumes an event with a given time and value for slop processing.
* Returns an amount <=value that should be consumed.
*/
float consumeEvent(nsecs_t eventTime, float value);
private:
bool shouldResetSlopTracking(nsecs_t eventTimeNanos, float value) const;
/** The amount of event values ignored after an inactivity of the slop duration. */
const float mSlopThreshold;
/** The duration of inactivity that resets slop controlling. */
const nsecs_t mSlopDurationNanos;
nsecs_t mLastEventTimeNanos = 0;
float mCumulativeValue = 0;
bool mHasSlopBeenMet = false;
};
} // namespace android
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