/*
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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.launcher3.util;
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import android.content.Context;
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import android.util.SparseArray;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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/**
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* Utility class to cache views at an activity level
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*/
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public class ViewCache {
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protected final SparseArray<CacheEntry> mCache = new SparseArray();
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public void setCacheSize(int layoutId, int size) {
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mCache.put(layoutId, new CacheEntry(size));
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}
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public <T extends View> T getView(int layoutId, Context context, ViewGroup parent) {
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CacheEntry entry = mCache.get(layoutId);
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if (entry == null) {
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entry = new CacheEntry(1);
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mCache.put(layoutId, entry);
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}
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if (entry.mCurrentSize > 0) {
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entry.mCurrentSize --;
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T result = (T) entry.mViews[entry.mCurrentSize];
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entry.mViews[entry.mCurrentSize] = null;
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return result;
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}
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return (T) LayoutInflater.from(context).inflate(layoutId, parent, false);
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}
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public void recycleView(int layoutId, View view) {
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CacheEntry entry = mCache.get(layoutId);
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if (entry != null && entry.mCurrentSize < entry.mMaxSize) {
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entry.mViews[entry.mCurrentSize] = view;
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entry.mCurrentSize++;
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}
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}
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private static class CacheEntry {
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final int mMaxSize;
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final View[] mViews;
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int mCurrentSize;
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public CacheEntry(int maxSize) {
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mMaxSize = maxSize;
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mViews = new View[maxSize];
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mCurrentSize = 0;
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}
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}
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}
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