/*
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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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import java.util.Collection;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.ListIterator;
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/**
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* Maintains an ordered list of the last N milliseconds of MotionEvents.
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*
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* This class is simply a convenience class designed to look like a simple list, but that
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* automatically discards old MotionEvents. It functions much like a queue - first in first out -
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* but does not have a fixed size like a circular buffer.
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*/
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public class TimeLimitedMotionEventBuffer implements List<MotionEvent> {
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private final LinkedList<MotionEvent> mMotionEvents;
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private long mMaxAgeMs;
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TimeLimitedMotionEventBuffer(long maxAgeMs) {
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super();
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this.mMaxAgeMs = maxAgeMs;
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this.mMotionEvents = new LinkedList<>();
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}
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private void ejectOldEvents() {
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if (mMotionEvents.isEmpty()) {
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return;
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}
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Iterator<MotionEvent> iter = listIterator();
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long mostRecentMs = mMotionEvents.getLast().getEventTime();
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while (iter.hasNext()) {
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MotionEvent ev = iter.next();
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if (mostRecentMs - ev.getEventTime() > mMaxAgeMs) {
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iter.remove();
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ev.recycle();
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}
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}
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}
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@Override
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public void add(int index, MotionEvent element) {
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throw new UnsupportedOperationException();
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}
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@Override
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public MotionEvent remove(int index) {
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return mMotionEvents.remove(index);
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}
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@Override
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public int indexOf(Object o) {
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return mMotionEvents.indexOf(o);
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}
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@Override
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public int lastIndexOf(Object o) {
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return mMotionEvents.lastIndexOf(o);
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}
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@Override
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public int size() {
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return mMotionEvents.size();
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}
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@Override
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public boolean isEmpty() {
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return mMotionEvents.isEmpty();
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}
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@Override
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public boolean contains(Object o) {
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return mMotionEvents.contains(o);
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}
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@Override
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public Iterator<MotionEvent> iterator() {
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return mMotionEvents.iterator();
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}
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@Override
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public Object[] toArray() {
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return mMotionEvents.toArray();
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}
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@Override
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public <T> T[] toArray(T[] a) {
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return mMotionEvents.toArray(a);
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}
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@Override
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public boolean add(MotionEvent element) {
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boolean result = mMotionEvents.add(element);
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ejectOldEvents();
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return result;
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}
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@Override
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public boolean remove(Object o) {
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return mMotionEvents.remove(o);
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}
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@Override
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public boolean containsAll(Collection<?> c) {
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return mMotionEvents.containsAll(c);
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}
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@Override
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public boolean addAll(Collection<? extends MotionEvent> collection) {
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boolean result = mMotionEvents.addAll(collection);
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ejectOldEvents();
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return result;
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}
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@Override
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public boolean addAll(int index, Collection<? extends MotionEvent> elements) {
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throw new UnsupportedOperationException();
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}
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@Override
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public boolean removeAll(Collection<?> c) {
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return mMotionEvents.removeAll(c);
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}
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@Override
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public boolean retainAll(Collection<?> c) {
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return mMotionEvents.retainAll(c);
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}
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@Override
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public void clear() {
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mMotionEvents.clear();
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}
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@Override
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public boolean equals(Object o) {
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return mMotionEvents.equals(o);
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}
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@Override
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public int hashCode() {
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return mMotionEvents.hashCode();
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}
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@Override
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public MotionEvent get(int index) {
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return mMotionEvents.get(index);
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}
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@Override
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public MotionEvent set(int index, MotionEvent element) {
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throw new UnsupportedOperationException();
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}
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@Override
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public ListIterator<MotionEvent> listIterator() {
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return new Iter(0);
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}
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@Override
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public ListIterator<MotionEvent> listIterator(int index) {
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return new Iter(index);
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}
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@Override
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public List<MotionEvent> subList(int fromIndex, int toIndex) {
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throw new UnsupportedOperationException();
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}
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class Iter implements ListIterator<MotionEvent> {
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private final ListIterator<MotionEvent> mIterator;
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Iter(int index) {
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this.mIterator = mMotionEvents.listIterator(index);
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}
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@Override
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public boolean hasNext() {
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return mIterator.hasNext();
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}
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@Override
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public MotionEvent next() {
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return mIterator.next();
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}
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@Override
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public boolean hasPrevious() {
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return mIterator.hasPrevious();
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}
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@Override
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public MotionEvent previous() {
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return mIterator.previous();
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}
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@Override
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public int nextIndex() {
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return mIterator.nextIndex();
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}
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@Override
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public int previousIndex() {
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return mIterator.previousIndex();
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}
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@Override
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public void remove() {
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mIterator.remove();
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}
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@Override
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public void set(MotionEvent motionEvent) {
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throw new UnsupportedOperationException();
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}
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@Override
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public void add(MotionEvent element) {
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throw new UnsupportedOperationException();
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}
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}
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}
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