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/*
* Copyright (C) 2020 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;
import static com.android.systemui.classifier.FalsingModule.SINGLE_TAP_TOUCH_SLOP;
import android.view.MotionEvent;
import java.util.List;
import javax.inject.Inject;
import javax.inject.Named;
/**
* Falsing classifier that accepts or rejects a single gesture as a tap.
*/
public class SingleTapClassifier extends FalsingClassifier {
private final float mTouchSlop;
@Inject
SingleTapClassifier(FalsingDataProvider dataProvider,
@Named(SINGLE_TAP_TOUCH_SLOP) float touchSlop) {
super(dataProvider);
mTouchSlop = touchSlop;
}
@Override
Result calculateFalsingResult(
@Classifier.InteractionType int interactionType,
double historyBelief, double historyConfidence) {
return isTap(getRecentMotionEvents(), 0.5);
}
/** Given a list of {@link android.view.MotionEvent}'s, returns true if the look like a tap. */
public Result isTap(List<MotionEvent> motionEvents, double falsePenalty) {
if (motionEvents.isEmpty()) {
return falsed(0, "no motion events");
}
float downX = motionEvents.get(0).getX();
float downY = motionEvents.get(0).getY();
for (MotionEvent event : motionEvents) {
String reason;
if (Math.abs(event.getX() - downX) >= mTouchSlop) {
reason = "dX too big for a tap: "
+ Math.abs(event.getX() - downX)
+ "vs "
+ mTouchSlop;
return falsed(falsePenalty, reason);
} else if (Math.abs(event.getY() - downY) >= mTouchSlop) {
reason = "dY too big for a tap: "
+ Math.abs(event.getY() - downY)
+ " vs "
+ mTouchSlop;
return falsed(falsePenalty, reason);
}
}
return Result.passed(0);
}
}
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