mirror of https://github.com/M66B/FairEmail.git
198 lines
6.8 KiB
Java
198 lines
6.8 KiB
Java
/*
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* Copyright 2020 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 androidx.recyclerview.widget;
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import android.util.SparseArray;
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import android.util.SparseIntArray;
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import androidx.annotation.NonNull;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Used by {@link ConcatAdapter} to isolate view types between nested adapters, if necessary.
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*/
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interface ViewTypeStorage {
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@NonNull
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NestedAdapterWrapper getWrapperForGlobalType(int globalViewType);
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@NonNull
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ViewTypeLookup createViewTypeWrapper(
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@NonNull NestedAdapterWrapper wrapper
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);
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/**
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* Api given to {@link NestedAdapterWrapper}s.
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*/
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interface ViewTypeLookup {
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int localToGlobal(int localType);
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int globalToLocal(int globalType);
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void dispose();
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}
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class SharedIdRangeViewTypeStorage implements ViewTypeStorage {
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// we keep a list of nested wrappers here even though we only need 1 to create because
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// they might be removed.
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SparseArray<List<NestedAdapterWrapper>> mGlobalTypeToWrapper = new SparseArray<>();
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@NonNull
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@Override
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public NestedAdapterWrapper getWrapperForGlobalType(int globalViewType) {
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List<NestedAdapterWrapper> nestedAdapterWrappers = mGlobalTypeToWrapper.get(
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globalViewType);
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if (nestedAdapterWrappers == null || nestedAdapterWrappers.isEmpty()) {
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throw new IllegalArgumentException("Cannot find the wrapper for global view"
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+ " type " + globalViewType);
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}
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// just return the first one since they are shared
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return nestedAdapterWrappers.get(0);
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}
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@NonNull
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@Override
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public ViewTypeLookup createViewTypeWrapper(
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@NonNull NestedAdapterWrapper wrapper) {
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return new WrapperViewTypeLookup(wrapper);
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}
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void removeWrapper(@NonNull NestedAdapterWrapper wrapper) {
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for (int i = mGlobalTypeToWrapper.size() - 1; i >= 0; i--) {
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List<NestedAdapterWrapper> wrappers = mGlobalTypeToWrapper.valueAt(i);
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if (wrappers.remove(wrapper)) {
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if (wrappers.isEmpty()) {
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mGlobalTypeToWrapper.removeAt(i);
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}
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}
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}
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}
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class WrapperViewTypeLookup implements ViewTypeLookup {
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final NestedAdapterWrapper mWrapper;
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WrapperViewTypeLookup(NestedAdapterWrapper wrapper) {
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mWrapper = wrapper;
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}
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@Override
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public int localToGlobal(int localType) {
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// register it first
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List<NestedAdapterWrapper> wrappers = mGlobalTypeToWrapper.get(
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localType);
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if (wrappers == null) {
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wrappers = new ArrayList<>();
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mGlobalTypeToWrapper.put(localType, wrappers);
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}
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if (!wrappers.contains(mWrapper)) {
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wrappers.add(mWrapper);
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}
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return localType;
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}
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@Override
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public int globalToLocal(int globalType) {
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return globalType;
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}
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@Override
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public void dispose() {
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removeWrapper(mWrapper);
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}
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}
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}
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class IsolatedViewTypeStorage implements ViewTypeStorage {
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SparseArray<NestedAdapterWrapper> mGlobalTypeToWrapper = new SparseArray<>();
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int mNextViewType = 0;
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int obtainViewType(NestedAdapterWrapper wrapper) {
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int nextId = mNextViewType++;
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mGlobalTypeToWrapper.put(nextId, wrapper);
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return nextId;
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}
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@NonNull
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@Override
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public NestedAdapterWrapper getWrapperForGlobalType(int globalViewType) {
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NestedAdapterWrapper wrapper = mGlobalTypeToWrapper.get(
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globalViewType);
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if (wrapper == null) {
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throw new IllegalArgumentException("Cannot find the wrapper for global"
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+ " view type " + globalViewType);
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}
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return wrapper;
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}
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@Override
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@NonNull
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public ViewTypeLookup createViewTypeWrapper(
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@NonNull NestedAdapterWrapper wrapper) {
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return new WrapperViewTypeLookup(wrapper);
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}
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void removeWrapper(@NonNull NestedAdapterWrapper wrapper) {
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for (int i = mGlobalTypeToWrapper.size() - 1; i >= 0; i--) {
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NestedAdapterWrapper existingWrapper = mGlobalTypeToWrapper.valueAt(i);
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if (existingWrapper == wrapper) {
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mGlobalTypeToWrapper.removeAt(i);
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}
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}
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}
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class WrapperViewTypeLookup implements ViewTypeLookup {
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private SparseIntArray mLocalToGlobalMapping = new SparseIntArray(1);
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private SparseIntArray mGlobalToLocalMapping = new SparseIntArray(1);
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final NestedAdapterWrapper mWrapper;
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WrapperViewTypeLookup(NestedAdapterWrapper wrapper) {
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mWrapper = wrapper;
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}
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@Override
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public int localToGlobal(int localType) {
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int index = mLocalToGlobalMapping.indexOfKey(localType);
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if (index > -1) {
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return mLocalToGlobalMapping.valueAt(index);
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}
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// get a new key.
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int globalType = obtainViewType(mWrapper);
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mLocalToGlobalMapping.put(localType, globalType);
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mGlobalToLocalMapping.put(globalType, localType);
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return globalType;
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}
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@Override
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public int globalToLocal(int globalType) {
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int index = mGlobalToLocalMapping.indexOfKey(globalType);
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if (index < 0) {
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throw new IllegalStateException("requested global type " + globalType + " does"
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+ " not belong to the adapter:" + mWrapper.adapter);
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}
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return mGlobalToLocalMapping.valueAt(index);
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}
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@Override
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public void dispose() {
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removeWrapper(mWrapper);
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}
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}
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}
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}
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