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/*
* Copyright (C) 2019 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.
*/
package com.android.systemui.classifier.brightline;
import static com.android.internal.config.sysui.SystemUiDeviceConfigFlags.BRIGHTLINE_FALSING_PROXIMITY_PERCENT_COVERED_THRESHOLD;
import static com.android.systemui.classifier.Classifier.QUICK_SETTINGS;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.provider.DeviceConfig;
import android.view.MotionEvent;
/**
* False touch if proximity sensor is covered for more than a certain percentage of the gesture.
*
* This classifer is essentially a no-op for QUICK_SETTINGS, as we assume the sensor may be
* covered when swiping from the top.
*/
class ProximityClassifier extends FalsingClassifier {
private static final float PERCENT_COVERED_THRESHOLD = 0.1f;
private final DistanceClassifier mDistanceClassifier;
private final float mPercentCoveredThreshold;
private boolean mNear;
private long mGestureStartTimeNs;
private long mPrevNearTimeNs;
private long mNearDurationNs;
private float mPercentNear;
ProximityClassifier(DistanceClassifier distanceClassifier,
FalsingDataProvider dataProvider) {
super(dataProvider);
this.mDistanceClassifier = distanceClassifier;
mPercentCoveredThreshold = DeviceConfig.getFloat(
DeviceConfig.NAMESPACE_SYSTEMUI,
BRIGHTLINE_FALSING_PROXIMITY_PERCENT_COVERED_THRESHOLD,
PERCENT_COVERED_THRESHOLD);
}
@Override
void onSessionStarted() {
mPrevNearTimeNs = 0;
mPercentNear = 0;
}
@Override
void onSessionEnded() {
mPrevNearTimeNs = 0;
mPercentNear = 0;
}
@Override
public void onTouchEvent(MotionEvent motionEvent) {
int action = motionEvent.getActionMasked();
if (action == MotionEvent.ACTION_DOWN) {
mGestureStartTimeNs = motionEvent.getEventTimeNano();
if (mPrevNearTimeNs > 0) {
// We only care about if the proximity sensor is triggered while a move event is
// happening.
mPrevNearTimeNs = motionEvent.getEventTimeNano();
}
logDebug("Gesture start time: " + mGestureStartTimeNs);
mNearDurationNs = 0;
}
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
update(mNear, motionEvent.getEventTimeNano());
long duration = motionEvent.getEventTimeNano() - mGestureStartTimeNs;
logDebug("Gesture duration, Proximity duration: " + duration + ", " + mNearDurationNs);
if (duration == 0) {
mPercentNear = mNear ? 1.0f : 0.0f;
} else {
mPercentNear = (float) mNearDurationNs / (float) duration;
}
}
}
@Override
public void onSensorEvent(SensorEvent sensorEvent) {
if (sensorEvent.sensor.getType() == Sensor.TYPE_PROXIMITY) {
logDebug("Sensor is: " + (sensorEvent.values[0] < sensorEvent.sensor.getMaximumRange())
+ " at time " + sensorEvent.timestamp);
update(
sensorEvent.values[0] < sensorEvent.sensor.getMaximumRange(),
sensorEvent.timestamp);
}
}
@Override
public boolean isFalseTouch() {
if (getInteractionType() == QUICK_SETTINGS) {
return false;
}
logInfo("Percent of gesture in proximity: " + mPercentNear);
if (mPercentNear > mPercentCoveredThreshold) {
return !mDistanceClassifier.isLongSwipe();
}
return false;
}
/**
* @param near is the sensor showing the near state right now
* @param timeStampNs time of this event in nanoseconds
*/
private void update(boolean near, long timeStampNs) {
if (mPrevNearTimeNs != 0 && timeStampNs > mPrevNearTimeNs && mNear) {
mNearDurationNs += timeStampNs - mPrevNearTimeNs;
logDebug("Updating duration: " + mNearDurationNs);
}
if (near) {
logDebug("Set prevNearTimeNs: " + timeStampNs);
mPrevNearTimeNs = timeStampNs;
}
mNear = near;
}
}
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