/* * 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.quickstep.util; import static com.android.systemui.shared.system.InputChannelCompat.mergeMotionEvent; import android.view.MotionEvent; import java.util.ArrayList; import java.util.function.Consumer; /** * Utility class to dispatch touch events to a different class. It stores the events locally * until a valid dispatcher is available. */ public class CachedEventDispatcher { private Consumer mConsumer; private ArrayList mCache; private MotionEvent mLastEvent; public void dispatchEvent(MotionEvent event) { if (mConsumer != null) { mConsumer.accept(event); } else { if (mLastEvent == null || !mergeMotionEvent(event, mLastEvent)) { // Queue event. if (mCache == null) { mCache = new ArrayList<>(); } mLastEvent = MotionEvent.obtain(event); mCache.add(mLastEvent); } } } public void setConsumer(Consumer consumer) { if (consumer == null) { return; } mConsumer = consumer; int cacheCount = mCache == null ? 0 : mCache.size(); for (int i = 0; i < cacheCount; i++) { MotionEvent ev = mCache.get(i); mConsumer.accept(ev); ev.recycle(); } mCache = null; mLastEvent = null; } public boolean hasConsumer() { return mConsumer != null; } }