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