86 lines
2.9 KiB
Java
86 lines
2.9 KiB
Java
/*
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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.settings.panel;
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import android.net.Uri;
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import androidx.slice.Slice;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.concurrent.CountDownLatch;
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/**
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* Helper class to isolate the work tracking all of the {@link Slice Slices} being loaded.
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* <p>
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* Uses a {@link CountDownLatch} and a {@link Set} of Slices to track how many
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* Slices have been loaded. A Slice can only be counted as being loaded a single time, even
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* when they get updated later.
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* <p>
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* To use the class, pass the number of expected Slices to load into the constructor. For
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* every Slice that loads, call {@link #markSliceLoaded(Uri)} with the corresponding
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* {@link Uri}. Then check if all of the Slices have loaded with
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* {@link #isPanelReadyToLoad()}, which will return {@code true} the first time after all
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* Slices have loaded.
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*
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* @deprecated this is no longer used after V and will be removed.
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*/
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@Deprecated(forRemoval = true)
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public class PanelSlicesLoaderCountdownLatch {
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private final Set<Uri> mLoadedSlices;
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private final CountDownLatch mCountDownLatch;
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private boolean slicesReadyToLoad = false;
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public PanelSlicesLoaderCountdownLatch(int countdownSize) {
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mLoadedSlices = new HashSet<>();
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mCountDownLatch = new CountDownLatch(countdownSize);
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}
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/**
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* Checks if the {@param sliceUri} has been loaded: if not, then decrement the countdown
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* latch, and if so, then do nothing.
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*/
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public void markSliceLoaded(Uri sliceUri) {
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if (mLoadedSlices.contains(sliceUri)) {
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return;
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}
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mLoadedSlices.add(sliceUri);
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mCountDownLatch.countDown();
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}
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/**
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* @return {@code true} if the Slice has already been loaded.
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*/
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public boolean isSliceLoaded(Uri uri) {
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return mLoadedSlices.contains(uri);
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}
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/**
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* @return {@code true} when all Slices have loaded, and the Panel has not yet been loaded.
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*/
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public boolean isPanelReadyToLoad() {
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/**
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* Use {@link slicesReadyToLoad} to track whether or not the Panel has been loaded. We
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* only want to animate the Panel a single time.
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*/
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if ((mCountDownLatch.getCount() == 0) && !slicesReadyToLoad) {
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slicesReadyToLoad = true;
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return true;
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}
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return false;
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}
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} |