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package com.mapbox.mapboxsdk.testapp.adapter;
import android.content.Context;
import android.support.annotation.IdRes;
import android.support.annotation.LayoutRes;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.mapbox.mapboxsdk.testapp.utils.FontCache;
import java.util.Arrays;
import java.util.Comparator;
public class FeatureSectionAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int SECTION_TYPE = 0;
private final Context context;
private final SparseArray<Section> sections;
private final RecyclerView.Adapter adapter;
@LayoutRes
private final int sectionRes;
@IdRes
private final int textRes;
private boolean valid = true;
public FeatureSectionAdapter(Context ctx, int sectionResourceId, int textResourceId, RecyclerView.Adapter baseAdapter) {
context = ctx;
sectionRes = sectionResourceId;
textRes = textResourceId;
adapter = baseAdapter;
sections = new SparseArray<>();
adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onChanged() {
valid = adapter.getItemCount() > 0;
notifyDataSetChanged();
}
@Override
public void onItemRangeChanged(int positionStart, int itemCount) {
valid = adapter.getItemCount() > 0;
notifyItemRangeChanged(positionStart, itemCount);
}
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
valid = adapter.getItemCount() > 0;
notifyItemRangeInserted(positionStart, itemCount);
}
@Override
public void onItemRangeRemoved(int positionStart, int itemCount) {
valid = adapter.getItemCount() > 0;
notifyItemRangeRemoved(positionStart, itemCount);
}
});
}
public static class SectionViewHolder extends RecyclerView.ViewHolder {
public TextView title;
public SectionViewHolder(@NonNull View view, @IdRes int textRes) {
super(view);
title = (TextView) view.findViewById(textRes);
title.setTypeface(FontCache.get("Roboto-Medium.ttf", view.getContext()));
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int typeView) {
if (typeView == SECTION_TYPE) {
final View view = LayoutInflater.from(context).inflate(sectionRes, parent, false);
return new SectionViewHolder(view, textRes);
} else {
return adapter.onCreateViewHolder(parent, typeView - 1);
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder sectionViewHolder, int position) {
if (isSectionHeaderPosition(position)) {
((SectionViewHolder) sectionViewHolder).title.setText(sections.get(position).title);
} else {
adapter.onBindViewHolder(sectionViewHolder, getConvertedPosition(position));
}
}
@Override
public int getItemViewType(int position) {
return isSectionHeaderPosition(position)
? SECTION_TYPE
: adapter.getItemViewType(getConvertedPosition(position)) + 1;
}
public static class Section {
int firstPosition;
int sectionedPosition;
CharSequence title;
public Section(int firstPosition, CharSequence title) {
this.firstPosition = firstPosition;
this.title = title;
}
public CharSequence getTitle() {
return title;
}
}
public void setSections(Section[] sections) {
this.sections.clear();
Arrays.sort(sections, new Comparator<Section>() {
@Override
public int compare(Section o, Section o1) {
return (o.firstPosition == o1.firstPosition)
? 0
: ((o.firstPosition < o1.firstPosition) ? -1 : 1);
}
});
int offset = 0;
for (Section section : sections) {
section.sectionedPosition = section.firstPosition + offset;
this.sections.append(section.sectionedPosition, section);
++offset;
}
notifyDataSetChanged();
}
public int getConvertedPosition(int sectionedPosition) {
if (isSectionHeaderPosition(sectionedPosition)) {
return RecyclerView.NO_POSITION;
}
int offset = 0;
for (int i = 0; i < sections.size(); i++) {
if (sections.valueAt(i).sectionedPosition > sectionedPosition) {
break;
}
--offset;
}
return sectionedPosition + offset;
}
public boolean isSectionHeaderPosition(int position) {
return sections.get(position) != null;
}
@Override
public long getItemId(int position) {
return isSectionHeaderPosition(position)
? Integer.MAX_VALUE - sections.indexOfKey(position)
: adapter.getItemId(getConvertedPosition(position));
}
@Override
public int getItemCount() {
return (valid ? adapter.getItemCount() + sections.size() : 0);
}
}
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