/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.systemui.classifier.brightline;
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import android.view.MotionEvent;
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/**
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* False touch if more than one finger touches the screen.
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*
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* IMPORTANT: This should not be used for certain cases (i.e. a11y) as we expect multiple fingers
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* for them.
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*/
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class PointerCountClassifier extends FalsingClassifier {
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private static final int MAX_ALLOWED_POINTERS = 1;
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private int mMaxPointerCount;
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PointerCountClassifier(FalsingDataProvider dataProvider) {
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super(dataProvider);
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}
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@Override
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public void onTouchEvent(MotionEvent motionEvent) {
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int pCount = mMaxPointerCount;
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if (motionEvent.getActionMasked() == MotionEvent.ACTION_DOWN) {
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mMaxPointerCount = motionEvent.getPointerCount();
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} else {
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mMaxPointerCount = Math.max(mMaxPointerCount, motionEvent.getPointerCount());
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}
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if (pCount != mMaxPointerCount) {
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logDebug("Pointers observed:" + mMaxPointerCount);
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}
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}
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@Override
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public boolean isFalseTouch() {
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return mMaxPointerCount > MAX_ALLOWED_POINTERS;
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}
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}
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