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package de.danoeh.antennapod.fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.widget.Toolbar;
import androidx.fragment.app.Fragment;
import androidx.viewpager2.adapter.FragmentStateAdapter;
import androidx.viewpager2.widget.ViewPager2;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;
import de.danoeh.antennapod.R;
import de.danoeh.antennapod.activity.MainActivity;
import de.danoeh.antennapod.event.FeedItemEvent;
import de.danoeh.antennapod.model.feed.FeedItem;
import de.danoeh.antennapod.core.storage.DBReader;
import de.danoeh.antennapod.menuhandler.FeedItemMenuHandler;
import io.reactivex.Observable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.Disposable;
import io.reactivex.schedulers.Schedulers;
/**
* Displays information about a list of FeedItems.
*/
public class ItemPagerFragment extends Fragment implements Toolbar.OnMenuItemClickListener {
private static final String ARG_FEEDITEMS = "feeditems";
private static final String ARG_FEEDITEM_POS = "feeditem_pos";
private static final String KEY_PAGER_ID = "pager_id";
private ViewPager2 pager;
/**
* Creates a new instance of an ItemPagerFragment.
*
* @param feeditems The IDs of the FeedItems that belong to the same list
* @param feedItemPos The position of the FeedItem that is currently shown
* @return The ItemFragment instance
*/
public static ItemPagerFragment newInstance(long[] feeditems, int feedItemPos) {
ItemPagerFragment fragment = new ItemPagerFragment();
Bundle args = new Bundle();
args.putLongArray(ARG_FEEDITEMS, feeditems);
args.putInt(ARG_FEEDITEM_POS, feedItemPos);
fragment.setArguments(args);
return fragment;
}
private long[] feedItems;
private FeedItem item;
private Disposable disposable;
private Toolbar toolbar;
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View layout = inflater.inflate(R.layout.feeditem_pager_fragment, container, false);
toolbar = layout.findViewById(R.id.toolbar);
toolbar.setTitle("");
toolbar.inflateMenu(R.menu.feeditem_options);
toolbar.setNavigationOnClickListener(v -> getParentFragmentManager().popBackStack());
toolbar.setOnMenuItemClickListener(this);
feedItems = getArguments().getLongArray(ARG_FEEDITEMS);
int feedItemPos = getArguments().getInt(ARG_FEEDITEM_POS);
pager = layout.findViewById(R.id.pager);
// FragmentStatePagerAdapter documentation:
// > When using FragmentStatePagerAdapter the host ViewPager must have a valid ID set.
// When opening multiple ItemPagerFragments by clicking "item" -> "visit podcast" -> "item" -> etc,
// the ID is no longer unique and FragmentStatePagerAdapter does not display any pages.
int newId = View.generateViewId();
if (savedInstanceState != null && savedInstanceState.getInt(KEY_PAGER_ID, 0) != 0) {
// Restore state by using the same ID as before. ID collisions are prevented in MainActivity.
newId = savedInstanceState.getInt(KEY_PAGER_ID, 0);
}
pager.setId(newId);
pager.setAdapter(new ItemPagerAdapter(this));
pager.setCurrentItem(feedItemPos, false);
pager.setOffscreenPageLimit(1);
loadItem(feedItems[feedItemPos]);
pager.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
@Override
public void onPageSelected(int position) {
loadItem(feedItems[position]);
}
});
EventBus.getDefault().register(this);
return layout;
}
@Override
public void onSaveInstanceState(@NonNull Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(KEY_PAGER_ID, pager.getId());
}
@Override
public void onDestroyView() {
super.onDestroyView();
EventBus.getDefault().unregister(this);
if (disposable != null) {
disposable.dispose();
}
}
private void loadItem(long itemId) {
if (disposable != null) {
disposable.dispose();
}
disposable = Observable.fromCallable(() -> DBReader.getFeedItem(itemId))
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(result -> {
item = result;
refreshToolbarState();
}, Throwable::printStackTrace);
}
public void refreshToolbarState() {
if (item == null) {
return;
}
if (item.hasMedia()) {
FeedItemMenuHandler.onPrepareMenu(toolbar.getMenu(), item);
} else {
// these are already available via button1 and button2
FeedItemMenuHandler.onPrepareMenu(toolbar.getMenu(), item,
R.id.mark_read_item, R.id.visit_website_item);
}
}
@Override
public boolean onMenuItemClick(MenuItem menuItem) {
if (menuItem.getItemId() == R.id.open_podcast) {
openPodcast();
return true;
}
return FeedItemMenuHandler.onMenuItemClicked(this, menuItem.getItemId(), item);
}
@Subscribe(threadMode = ThreadMode.MAIN)
public void onEventMainThread(FeedItemEvent event) {
for (FeedItem item : event.items) {
if (this.item != null && this.item.getId() == item.getId()) {
this.item = item;
refreshToolbarState();
return;
}
}
}
private void openPodcast() {
Fragment fragment = FeedItemlistFragment.newInstance(item.getFeedId());
((MainActivity) getActivity()).loadChildFragment(fragment);
}
private class ItemPagerAdapter extends FragmentStateAdapter {
ItemPagerAdapter(@NonNull Fragment fragment) {
super(fragment);
}
@NonNull
@Override
public Fragment createFragment(int position) {
return ItemFragment.newInstance(feedItems[position]);
}
@Override
public int getItemCount() {
return feedItems.length;
}
}
}
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