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/*
* Copyright (C) 2015 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.setupwizardlib.view;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.support.v7.widget.RecyclerView;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import com.android.setupwizardlib.R;
import com.android.setupwizardlib.annotations.VisibleForTesting;
/**
* A RecyclerView that can display a header item at the start of the list. The header can be set by
* {@code app:suwHeader} in XML. Note that the header will not be inflated until a layout manager
* is set.
*/
public class HeaderRecyclerView extends RecyclerView {
private static class HeaderViewHolder extends ViewHolder {
public HeaderViewHolder(View itemView) {
super(itemView);
}
}
/**
* An adapter that can optionally add one header item to the RecyclerView.
*/
public static class HeaderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private RecyclerView.Adapter mAdapter;
private View mHeader;
private static final int HEADER_VIEW_TYPE = Integer.MAX_VALUE;
public HeaderAdapter(RecyclerView.Adapter adapter) {
mAdapter = adapter;
setHasStableIds(mAdapter.hasStableIds());
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == HEADER_VIEW_TYPE) {
return new HeaderViewHolder(mHeader);
} else {
return mAdapter.onCreateViewHolder(parent, viewType);
}
}
@Override
@SuppressWarnings("unchecked")
public void onBindViewHolder(ViewHolder holder, int position) {
if (mHeader != null) {
position--;
}
if (position >= 0) {
mAdapter.onBindViewHolder(holder, position);
}
}
@Override
public int getItemViewType(int position) {
if (mHeader != null) {
position--;
}
if (position < 0) {
return HEADER_VIEW_TYPE;
}
return mAdapter.getItemViewType(position);
}
@Override
public int getItemCount() {
int count = mAdapter.getItemCount();
if (mHeader != null) {
count++;
}
return count;
}
@Override
public long getItemId(int position) {
if (mHeader != null) {
position--;
}
if (position < 0) {
return Long.MAX_VALUE;
}
return mAdapter.getItemId(position);
}
public void setHeader(View header) {
mHeader = header;
}
@VisibleForTesting
public RecyclerView.Adapter getWrappedAdapter() {
return mAdapter;
}
}
private View mHeader;
private int mHeaderRes;
public HeaderRecyclerView(Context context) {
super(context);
init(null, 0);
}
public HeaderRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
}
public HeaderRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(attrs, defStyleAttr);
}
private void init(AttributeSet attrs, int defStyleAttr) {
final TypedArray a = getContext().obtainStyledAttributes(attrs,
R.styleable.SuwHeaderRecyclerView, defStyleAttr, 0);
mHeaderRes = a.getResourceId(R.styleable.SuwHeaderRecyclerView_suwHeader, 0);
a.recycle();
}
@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
// Decoration-only headers should not count as an item for accessibility, adjust the
// accessibility event to account for that.
final int numberOfHeaders = mHeader != null ? 1 : 0;
event.setItemCount(event.getItemCount() - numberOfHeaders);
event.setFromIndex(Math.max(event.getFromIndex() - numberOfHeaders, 0));
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
event.setToIndex(Math.max(event.getToIndex() - numberOfHeaders, 0));
}
}
/**
* Gets the header view of this RecyclerView, or {@code null} if there are no headers.
*/
public View getHeader() {
return mHeader;
}
@Override
public void setLayoutManager(LayoutManager layout) {
super.setLayoutManager(layout);
if (layout != null && mHeader == null && mHeaderRes != 0) {
// Inflating a child view requires the layout manager to be set. Check here to see if
// any header item is specified in XML and inflate them.
final LayoutInflater inflater = LayoutInflater.from(getContext());
mHeader = inflater.inflate(mHeaderRes, this, false);
}
}
@Override
public void setAdapter(Adapter adapter) {
if (mHeader != null && adapter != null) {
final HeaderAdapter headerAdapter = new HeaderAdapter(adapter);
headerAdapter.setHeader(mHeader);
adapter = headerAdapter;
}
super.setAdapter(adapter);
}
}
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