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package org.fox.ttrss;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.viewpager2.widget.ViewPager2;
import org.fox.ttrss.types.Article;
import org.fox.ttrss.types.Feed;
import org.fox.ttrss.util.ArticleDiffItemCallback;
import org.fox.ttrss.util.DiffFragmentStateAdapter;
import java.util.ArrayList;
public class ArticlePager extends androidx.fragment.app.Fragment {
private final String TAG = this.getClass().getSimpleName();
private PagerAdapter m_adapter;
private HeadlinesEventListener m_listener;
private OnlineActivity m_activity;
private Feed m_feed;
private ViewPager2 m_pager;
private static class PagerAdapter extends DiffFragmentStateAdapter<Article> {
public PagerAdapter(@NonNull Fragment fragment) {
super(fragment, new ArticleDiffItemCallback());
}
private void syncToSharedArticles() {
submitList(new ArrayList<>(Application.getArticles()));
}
@Override
@NonNull
public Fragment createFragment(int position) {
Article article = getItem(position);
ArticleFragment af = new ArticleFragment();
af.initialize(article);
return af;
}
}
public void initialize(int articleId, Feed feed) {
m_feed = feed;
}
@Override
public void onSaveInstanceState(Bundle out) {
super.onSaveInstanceState(out);
out.putParcelable("m_feed", m_feed);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
m_feed = savedInstanceState.getParcelable("m_feed");
}
setRetainInstance(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_article_pager, container, false);
m_adapter = new PagerAdapter(this);
m_adapter.submitList(Application.getArticles());
ArticleModel model = Application.getArticlesModel();
// deal with further updates
model.getArticles().observe(getActivity(), articles -> {
Log.d(TAG, "observed article list size=" + articles.size());
m_adapter.submitList(articles);
});
model.getActive().observe(getActivity(), (activeArticle) -> {
Log.d(TAG, "observed active article=" + activeArticle);
if (activeArticle != null) {
int position = model.getArticles().getValue().indexOf(activeArticle);
if (position != -1 && position != m_pager.getCurrentItem())
m_pager.setCurrentItem(position, false);
}
});
m_pager = view.findViewById(R.id.article_pager);
m_pager.setAdapter(m_adapter);
m_pager.setOffscreenPageLimit(3);
m_pager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
@Override
public void onPageSelected(int position) {
Log.d(TAG, "onPageSelected: " + position);
// wtf
if (position != -1) {
Article article = Application.getArticles().get(position);
m_listener.onArticleSelected(article);
}
}
});
return view;
}
@Override
public void onAttach(@NonNull Activity activity) {
super.onAttach(activity);
m_listener = (HeadlinesEventListener) activity;
m_activity = (OnlineActivity) activity;
}
@SuppressLint("NewApi")
@Override
public void onResume() {
super.onResume();
m_activity.invalidateOptionsMenu();
}
public void switchToArticle(boolean next) {
int position = m_pager.getCurrentItem();
if (position != -1) {
if (next)
position++;
else
position--;
try {
Article targetArticle = Application.getArticles().get(position);
Application.getArticlesModel().setActive(targetArticle);
} catch (IndexOutOfBoundsException e) {
e.printStackTrace();
}
}
}
public void syncToSharedArticles() {
if (m_adapter != null)
m_adapter.syncToSharedArticles();
}
}
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