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package app.fedilab.android.mastodon.ui.fragment.timeline;
/* Copyright 2022 Thomas Schneider
*
* This file is a part of Fedilab
*
* This program is free software; you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* Fedilab is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along with Fedilab; if not,
* see <http://www.gnu.org/licenses>. */
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
import app.fedilab.android.BaseMainActivity;
import app.fedilab.android.R;
import app.fedilab.android.databinding.FragmentPaginationBinding;
import app.fedilab.android.mastodon.client.entities.api.Suggestion;
import app.fedilab.android.mastodon.client.entities.api.Suggestions;
import app.fedilab.android.mastodon.ui.drawer.SuggestionAdapter;
import app.fedilab.android.mastodon.viewmodel.mastodon.AccountsVM;
public class FragmentMastodonSuggestion extends Fragment {
private FragmentPaginationBinding binding;
private AccountsVM accountsVM;
private boolean flagLoading;
private List<Suggestion> suggestions;
private String max_id;
private SuggestionAdapter suggestionAdapter;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
flagLoading = false;
binding = FragmentPaginationBinding.inflate(inflater, container, false);
return binding.getRoot();
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
binding.loader.setVisibility(View.VISIBLE);
binding.recyclerView.setVisibility(View.GONE);
accountsVM = new ViewModelProvider(FragmentMastodonSuggestion.this).get(AccountsVM.class);
max_id = null;
accountsVM.getSuggestions(BaseMainActivity.currentInstance, BaseMainActivity.currentToken, null)
.observe(getViewLifecycleOwner(), this::initializeAccountCommonView);
}
public void scrollToTop() {
binding.recyclerView.setAdapter(suggestionAdapter);
}
/**
* Intialize the view for Suggestions
*
* @param suggestions {@link Suggestions}
*/
private void initializeAccountCommonView(final Suggestions suggestions) {
flagLoading = false;
if (binding == null || !isAdded() || getActivity() == null) {
return;
}
binding.loader.setVisibility(View.GONE);
binding.noAction.setVisibility(View.GONE);
binding.swipeContainer.setRefreshing(false);
binding.swipeContainer.setOnRefreshListener(() -> {
binding.swipeContainer.setRefreshing(true);
flagLoading = false;
max_id = null;
accountsVM.getSuggestions(BaseMainActivity.currentInstance, BaseMainActivity.currentToken, null)
.observe(getViewLifecycleOwner(), this::initializeAccountCommonView);
});
if (suggestions == null || suggestions.suggestions == null || suggestions.suggestions.size() == 0) {
binding.noAction.setVisibility(View.VISIBLE);
binding.noActionText.setText(R.string.no_accounts);
return;
}
binding.recyclerView.setVisibility(View.VISIBLE);
this.suggestions = suggestions.suggestions;
suggestionAdapter = new SuggestionAdapter(this.suggestions);
flagLoading = suggestions.pagination.max_id == null;
LinearLayoutManager mLayoutManager = new LinearLayoutManager(requireActivity());
binding.recyclerView.setLayoutManager(mLayoutManager);
binding.recyclerView.setAdapter(suggestionAdapter);
max_id = suggestions.pagination.max_id;
binding.recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
int firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition();
if (dy > 0) {
int visibleItemCount = mLayoutManager.getChildCount();
int totalItemCount = mLayoutManager.getItemCount();
if (firstVisibleItem + visibleItemCount == totalItemCount) {
if (!flagLoading) {
flagLoading = true;
binding.loadingNextElements.setVisibility(View.VISIBLE);
accountsVM.getSuggestions(BaseMainActivity.currentInstance, BaseMainActivity.currentToken, max_id)
.observe(getViewLifecycleOwner(), suggestionsPaginated -> {
dealWithPagination(suggestionsPaginated);
});
}
} else {
binding.loadingNextElements.setVisibility(View.GONE);
}
}
}
});
}
/**
* Update view and pagination when scrolling down
*
* @param suggestions_fetched Suggestions
*/
private void dealWithPagination(Suggestions suggestions_fetched) {
flagLoading = false;
if (binding == null || !isAdded() || getActivity() == null) {
return;
}
binding.loadingNextElements.setVisibility(View.GONE);
if (this.suggestions != null && suggestions_fetched != null && suggestions_fetched.suggestions != null) {
flagLoading = suggestions_fetched.pagination.max_id == null;
int startId = this.suggestions.size();
this.suggestions.addAll(suggestions_fetched.suggestions);
max_id = suggestions_fetched.pagination.max_id;
suggestionAdapter.notifyItemRangeInserted(startId, suggestions_fetched.suggestions.size());
} else {
flagLoading = true;
}
}
}
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