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ExampleSectionDataProvider.java
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ExampleSectionDataProvider.java
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/*
* Copyright (C) 2015 Haruki Hasegawa
*
* 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.h6ah4i.android.example.advrecyclerview.common.data;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import androidx.annotation.NonNull;
public class ExampleSectionDataProvider extends AbstractDataProvider {
private List<ConcreteData> mData;
private ConcreteData mLastRemovedData;
private int mLastRemovedPosition = -1;
public static final int ITEM_VIEW_TYPE_SECTION_HEADER = 0;
public static final int ITEM_VIEW_TYPE_SECTION_ITEM = 1;
public ExampleSectionDataProvider() {
final String sectionItems = "ABCDE";
final String innerSectionItems = "abc";
mData = new LinkedList<>();
for (int i = 0; i < sectionItems.length(); i++) {
// put section header
{
final long id = mData.size();
final int viewType = ITEM_VIEW_TYPE_SECTION_HEADER;
final String text = "Section " + Character.toString(sectionItems.charAt(i));
mData.add(new ConcreteData(id, true, viewType, text));
}
// put section child items
for (int j = 0; j < innerSectionItems.length(); j++) {
final long id = mData.size();
final int viewType = ITEM_VIEW_TYPE_SECTION_ITEM;
final String text = Character.toString(innerSectionItems.charAt(j));
mData.add(new ConcreteData(id, false, viewType, text));
}
}
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Data getItem(int index) {
if (index < 0 || index >= getCount()) {
throw new IndexOutOfBoundsException("index = " + index);
}
return mData.get(index);
}
@Override
public int undoLastRemoval() {
if (mLastRemovedData != null) {
int insertedPosition;
if (mLastRemovedPosition >= 0 && mLastRemovedPosition < mData.size()) {
insertedPosition = mLastRemovedPosition;
} else {
insertedPosition = mData.size();
}
mData.add(insertedPosition, mLastRemovedData);
mLastRemovedData = null;
mLastRemovedPosition = -1;
return insertedPosition;
} else {
return -1;
}
}
@Override
public void moveItem(int fromPosition, int toPosition) {
if (fromPosition == toPosition) {
return;
}
final ConcreteData item = mData.remove(fromPosition);
mData.add(toPosition, item);
mLastRemovedPosition = -1;
}
@Override
public void swapItem(int fromPosition, int toPosition) {
if (fromPosition == toPosition) {
return;
}
Collections.swap(mData, fromPosition, toPosition);
mLastRemovedPosition = -1;
}
@Override
public void removeItem(int position) {
//noinspection UnnecessaryLocalVariable
final ConcreteData removedItem = mData.remove(position);
mLastRemovedData = removedItem;
mLastRemovedPosition = position;
}
public static final class ConcreteData extends Data {
private final long mId;
private final boolean mIsSectionHeader;
@NonNull
private final String mText;
private final int mViewType;
private boolean mPinned;
ConcreteData(long id, boolean isSectionHeader, int viewType, @NonNull String text) {
mId = id;
mIsSectionHeader = isSectionHeader;
mViewType = viewType;
mText = text;
}
@Override
public boolean isSectionHeader() {
return mIsSectionHeader;
}
@Override
public int getViewType() {
return mViewType;
}
@Override
public long getId() {
return mId;
}
@NonNull
@Override
public String toString() {
return mText;
}
@Override
public String getText() {
return mText;
}
@Override
public boolean isPinned() {
return mPinned;
}
@Override
public void setPinned(boolean pinned) {
mPinned = pinned;
}
}
}