chinwag-android/app/src/main/java/com/keylesspalace/tusky/fragment/NotificationsFragment.java

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/* Copyright 2017 Andrew Dawson
*
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* This file is a part of Tusky.
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*
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* 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.
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*
* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.fragment;
import android.arch.core.util.Function;
import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.TabLayout;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
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import com.keylesspalace.tusky.MainActivity;
import com.keylesspalace.tusky.adapter.FooterViewHolder;
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import com.keylesspalace.tusky.adapter.NotificationsAdapter;
import com.keylesspalace.tusky.R;
import com.keylesspalace.tusky.entity.Notification;
import com.keylesspalace.tusky.entity.Status;
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import com.keylesspalace.tusky.interfaces.StatusActionListener;
import com.keylesspalace.tusky.receiver.TimelineReceiver;
import com.keylesspalace.tusky.util.HttpHeaderLink;
import com.keylesspalace.tusky.util.PairedList;
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import com.keylesspalace.tusky.util.ThemeUtils;
import com.keylesspalace.tusky.util.ViewDataUtils;
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import com.keylesspalace.tusky.view.EndlessOnScrollListener;
import com.keylesspalace.tusky.viewdata.NotificationViewData;
import com.keylesspalace.tusky.viewdata.StatusViewData;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
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public class NotificationsFragment extends SFragment implements
SwipeRefreshLayout.OnRefreshListener, StatusActionListener,
NotificationsAdapter.NotificationActionListener,
SharedPreferences.OnSharedPreferenceChangeListener {
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private static final String TAG = "Notifications"; // logging tag
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private enum FetchEnd {
TOP,
BOTTOM
}
private SwipeRefreshLayout swipeRefreshLayout;
private LinearLayoutManager layoutManager;
private RecyclerView recyclerView;
private EndlessOnScrollListener scrollListener;
private NotificationsAdapter adapter;
private TabLayout.OnTabSelectedListener onTabSelectedListener;
private boolean hideFab;
private TimelineReceiver timelineReceiver;
private boolean topLoading;
private int topFetches;
private boolean bottomLoading;
private int bottomFetches;
private String bottomId;
private String topId;
private final PairedList<Notification, NotificationViewData> notifications
= new PairedList<>(new Function<Notification, NotificationViewData>() {
@Override
public NotificationViewData apply(Notification input) {
return ViewDataUtils.notificationToViewData(input);
}
});
public static NotificationsFragment newInstance() {
NotificationsFragment fragment = new NotificationsFragment();
Bundle arguments = new Bundle();
fragment.setArguments(arguments);
return fragment;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_timeline, container, false);
// Setup the SwipeRefreshLayout.
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Context context = getContext();
swipeRefreshLayout = (SwipeRefreshLayout) rootView.findViewById(R.id.swipe_refresh_layout);
swipeRefreshLayout.setOnRefreshListener(this);
// Setup the RecyclerView.
recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(context);
recyclerView.setLayoutManager(layoutManager);
DividerItemDecoration divider = new DividerItemDecoration(
context, layoutManager.getOrientation());
Drawable drawable = ThemeUtils.getDrawable(context, R.attr.status_divider_drawable,
R.drawable.status_divider_dark);
divider.setDrawable(drawable);
recyclerView.addItemDecoration(divider);
adapter = new NotificationsAdapter(this, this);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(
getActivity());
boolean mediaPreviewEnabled = preferences.getBoolean("mediaPreviewEnabled", true);
adapter.setMediaPreviewEnabled(mediaPreviewEnabled);
recyclerView.setAdapter(adapter);
timelineReceiver = new TimelineReceiver(this);
LocalBroadcastManager.getInstance(context.getApplicationContext())
.registerReceiver(timelineReceiver, TimelineReceiver.getFilter(null));
topLoading = false;
topFetches = 0;
bottomLoading = false;
bottomFetches = 0;
bottomId = null;
topId = null;
return rootView;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
MainActivity activity = (MainActivity) getActivity();
// MainActivity's layout is guaranteed to be inflated until onCreate returns.
TabLayout layout = (TabLayout) activity.findViewById(R.id.tab_layout);
onTabSelectedListener = new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
jumpToTop();
}
};
layout.addOnTabSelectedListener(onTabSelectedListener);
/* This is delayed until onActivityCreated solely because MainActivity.composeButton isn't
* guaranteed to be set until then.
* Use a modified scroll listener that both loads more notifications as it goes, and hides
* the compose button on down-scroll. */
final FloatingActionButton composeButton = activity.composeButton;
final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(
activity);
preferences.registerOnSharedPreferenceChangeListener(this);
hideFab = preferences.getBoolean("fabHide", false);
scrollListener = new EndlessOnScrollListener(layoutManager) {
@Override
public void onScrolled(RecyclerView view, int dx, int dy) {
super.onScrolled(view, dx, dy);
if (hideFab) {
if (dy > 0 && composeButton.isShown()) {
composeButton.hide(); // hides the button if we're scrolling down
} else if (dy < 0 && !composeButton.isShown()) {
composeButton.show(); // shows it if we are scrolling up
}
} else if (!composeButton.isShown()) {
composeButton.show();
}
}
@Override
public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
NotificationsFragment.this.onLoadMore();
}
};
recyclerView.addOnScrollListener(scrollListener);
}
@Override
public void onDestroyView() {
TabLayout tabLayout = (TabLayout) getActivity().findViewById(R.id.tab_layout);
tabLayout.removeOnTabSelectedListener(onTabSelectedListener);
LocalBroadcastManager.getInstance(getContext())
.unregisterReceiver(timelineReceiver);
super.onDestroyView();
}
@Override
public void onRefresh() {
sendFetchNotificationsRequest(null, topId, FetchEnd.TOP);
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}
@Override
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public void onReply(int position) {
Notification notification = notifications.get(position);
super.reply(notification.status);
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}
@Override
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public void onReblog(boolean reblog, int position) {
Notification notification = notifications.get(position);
super.reblog(notification.status, reblog, adapter, position);
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}
@Override
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public void onFavourite(boolean favourite, int position) {
Notification notification = notifications.get(position);
super.favourite(notification.status, favourite, adapter, position);
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}
@Override
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public void onMore(View view, int position) {
Notification notification = notifications.get(position);
super.more(notification.status, view, position);
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}
@Override
public void onViewMedia(String[] urls, int urlIndex, Status.MediaAttachment.Type type) {
super.viewMedia(urls, urlIndex, type);
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}
@Override
public void onViewThread(int position) {
Notification notification = notifications.get(position);
super.viewThread(notification.status);
}
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@Override
public void onOpenReblog(int position) {
Notification notification = notifications.get(position);
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if (notification != null) onViewAccount(notification.account.id);
}
@Override
public void onExpandedChange(boolean expanded, int position) {
NotificationViewData old = notifications.getPairedItem(position);
StatusViewData statusViewData =
new StatusViewData.Builder(old.getStatusViewData())
.setIsExpanded(expanded)
.createStatusViewData();
NotificationViewData notificationViewData = new NotificationViewData(old.getType(),
old.getId(), old.getAccount(), statusViewData);
notifications.setPairedItem(position, notificationViewData);
adapter.updateItemWithNotify(position, notificationViewData, false);
}
@Override
public void onContentHiddenChange(boolean isShowing, int position) {
NotificationViewData old = notifications.getPairedItem(position);
StatusViewData statusViewData =
new StatusViewData.Builder(old.getStatusViewData())
.setIsShowingSensitiveContent(isShowing)
.createStatusViewData();
NotificationViewData notificationViewData = new NotificationViewData(old.getType(),
old.getId(), old.getAccount(), statusViewData);
notifications.setPairedItem(position, notificationViewData);
adapter.updateItemWithNotify(position, notificationViewData, false);
}
@Override
public void onViewTag(String tag) {
super.viewTag(tag);
}
@Override
public void onViewAccount(String id) {
super.viewAccount(id);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
switch (key) {
case "fabHide": {
hideFab = sharedPreferences.getBoolean("fabHide", false);
break;
}
case "mediaPreviewEnabled": {
boolean enabled = sharedPreferences.getBoolean("mediaPreviewEnabled", true);
adapter.setMediaPreviewEnabled(enabled);
fullyRefresh();
break;
}
}
}
@Override
public void removeItem(int position) {
notifications.remove(position);
adapter.update(notifications.getPairedCopy());
}
@Override
public void removeAllByAccountId(String accountId) {
// using iterator to safely remove items while iterating
Iterator<Notification> iterator = notifications.iterator();
while (iterator.hasNext()) {
Notification notification = iterator.next();
if (notification.account.id.equals(accountId)) {
iterator.remove();
}
}
adapter.update(notifications.getPairedCopy());
}
private void onLoadMore() {
sendFetchNotificationsRequest(bottomId, null, FetchEnd.BOTTOM);
}
private void jumpToTop() {
layoutManager.scrollToPosition(0);
scrollListener.reset();
}
private void sendFetchNotificationsRequest(String fromId, String uptoId,
final FetchEnd fetchEnd) {
/* If there is a fetch already ongoing, record however many fetches are requested and
* fulfill them after it's complete. */
if (fetchEnd == FetchEnd.TOP && topLoading) {
topFetches++;
return;
}
if (fetchEnd == FetchEnd.BOTTOM && bottomLoading) {
bottomFetches++;
return;
}
if (fromId != null || adapter.getItemCount() <= 1) {
/* When this is called by the EndlessScrollListener it cannot refresh the footer state
* using adapter.notifyItemChanged. So its necessary to postpone doing so until a
* convenient time for the UI thread using a Runnable. */
recyclerView.post(new Runnable() {
@Override
public void run() {
adapter.setFooterState(FooterViewHolder.State.LOADING);
}
});
}
Call<List<Notification>> call = mastodonApi.notifications(fromId, uptoId, null);
call.enqueue(new Callback<List<Notification>>() {
@Override
public void onResponse(Call<List<Notification>> call,
Response<List<Notification>> response) {
if (response.isSuccessful()) {
String linkHeader = response.headers().get("Link");
onFetchNotificationsSuccess(response.body(), linkHeader, fetchEnd);
} else {
onFetchNotificationsFailure(new Exception(response.message()), fetchEnd);
}
}
@Override
public void onFailure(Call<List<Notification>> call, Throwable t) {
onFetchNotificationsFailure((Exception) t, fetchEnd);
}
});
callList.add(call);
}
private void onFetchNotificationsSuccess(List<Notification> notifications, String linkHeader,
FetchEnd fetchEnd) {
List<HttpHeaderLink> links = HttpHeaderLink.parse(linkHeader);
switch (fetchEnd) {
case TOP: {
HttpHeaderLink previous = HttpHeaderLink.findByRelationType(links, "prev");
String uptoId = null;
if (previous != null) {
uptoId = previous.uri.getQueryParameter("since_id");
}
update(notifications, null, uptoId);
break;
}
case BOTTOM: {
HttpHeaderLink next = HttpHeaderLink.findByRelationType(links, "next");
String fromId = null;
if (next != null) {
fromId = next.uri.getQueryParameter("max_id");
}
if (adapter.getItemCount() > 1) {
addItems(notifications, fromId);
} else {
/* If this is the first fetch, also save the id from the "previous" link and
* treat this operation as a refresh so the scroll position doesn't get pushed
* down to the end. */
HttpHeaderLink previous = HttpHeaderLink.findByRelationType(links, "prev");
String uptoId = null;
if (previous != null) {
uptoId = previous.uri.getQueryParameter("since_id");
}
update(notifications, fromId, uptoId);
}
/* Set last update id for pull notifications so that we don't get notified
* about things we already loaded here */
getPrivatePreferences().edit()
.putString("lastUpdateId", fromId)
.apply();
break;
}
}
fulfillAnyQueuedFetches(fetchEnd);
if (notifications.size() == 0 && adapter.getItemCount() == 1) {
adapter.setFooterState(FooterViewHolder.State.EMPTY);
} else {
adapter.setFooterState(FooterViewHolder.State.END);
}
swipeRefreshLayout.setRefreshing(false);
}
public void update(@Nullable List<Notification> newNotifications, @Nullable String fromId,
@Nullable String uptoId) {
if (newNotifications == null || newNotifications.isEmpty()) {
return;
}
if (fromId != null) {
bottomId = fromId;
}
if (uptoId != null) {
topId = uptoId;
}
if (notifications.isEmpty()) {
// This construction removes duplicates while preserving order.
notifications.addAll(new LinkedHashSet<>(newNotifications));
} else {
int index = notifications.indexOf(newNotifications.get(newNotifications.size() - 1));
for (int i = 0; i < index; i++) {
notifications.remove(0);
}
int newIndex = newNotifications.indexOf(notifications.get(0));
if (newIndex == -1) {
notifications.addAll(0, newNotifications);
} else {
List<Notification> sublist = newNotifications.subList(0, newIndex);
notifications.addAll(0, sublist);
}
}
adapter.update(notifications.getPairedCopy());
}
public void addItems(List<Notification> newNotifications, @Nullable String fromId) {
if (fromId != null) {
bottomId = fromId;
}
int end = notifications.size();
Notification last = notifications.get(end - 1);
if (last != null && !findNotification(newNotifications, last.id) && newNotifications.size() > 0) {
notifications.addAll(newNotifications);
List<NotificationViewData> newViewDatas = notifications.getPairedCopy()
.subList(notifications.size() - newNotifications.size(),
notifications.size() - 1);
adapter.addItems(newViewDatas);
}
}
private static boolean findNotification(List<Notification> notifications, String id) {
for (Notification notification : notifications) {
if (notification.id.equals(id)) {
return true;
}
}
return false;
}
private void onFetchNotificationsFailure(Exception exception, FetchEnd fetchEnd) {
swipeRefreshLayout.setRefreshing(false);
Log.e(TAG, "Fetch failure: " + exception.getMessage());
fulfillAnyQueuedFetches(fetchEnd);
}
private void fulfillAnyQueuedFetches(FetchEnd fetchEnd) {
switch (fetchEnd) {
case BOTTOM: {
bottomLoading = false;
if (bottomFetches > 0) {
bottomFetches--;
onLoadMore();
}
break;
}
case TOP: {
topLoading = false;
if (topFetches > 0) {
topFetches--;
onRefresh();
}
break;
}
}
}
private void fullyRefresh() {
adapter.clear();
notifications.clear();
sendFetchNotificationsRequest(null, null, FetchEnd.TOP);
}
}