Tusky-App-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.app.Activity;
import android.app.NotificationManager;
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.NonNull;
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.NotificationPullJobCreator;
import com.keylesspalace.tusky.adapter.FooterViewHolder;
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import com.keylesspalace.tusky.adapter.NotificationsAdapter;
import com.keylesspalace.tusky.R;
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import com.keylesspalace.tusky.entity.Attachment;
import com.keylesspalace.tusky.entity.Notification;
import com.keylesspalace.tusky.entity.Status;
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import com.keylesspalace.tusky.interfaces.ActionButtonActivity;
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import com.keylesspalace.tusky.interfaces.StatusActionListener;
import com.keylesspalace.tusky.receiver.TimelineReceiver;
import com.keylesspalace.tusky.util.CollectionUtil;
import com.keylesspalace.tusky.util.Either;
import com.keylesspalace.tusky.util.HttpHeaderLink;
import com.keylesspalace.tusky.util.ListUtils;
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.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 = "NotificationF"; // logging tag
private static final int LOAD_AT_ONCE = 30;
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private enum FetchEnd {
TOP,
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BOTTOM,
MIDDLE
}
/**
* Placeholder for the notifications. Consider moving to the separate class to hide constructor
* and reuse in different places as needed.
*/
private static final class Placeholder {
private static final Placeholder INSTANCE = new Placeholder();
public static Placeholder getInstance() {
return INSTANCE;
}
private Placeholder() {
}
}
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;
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private boolean alwaysShowSensitiveMedia;
// Each element is either a Notification for loading data or a Placeholder
private final PairedList<Either<Placeholder, Notification>, NotificationViewData> notifications
= new PairedList<>(new Function<Either<Placeholder, Notification>, NotificationViewData>() {
@Override
public NotificationViewData apply(Either<Placeholder, Notification> input) {
if (input.isRight()) {
Notification notification = input.getAsRight();
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return ViewDataUtils.notificationToViewData(notification, alwaysShowSensitiveMedia);
} else {
return new NotificationViewData.Placeholder(false);
}
}
});
public static NotificationsFragment newInstance() {
NotificationsFragment fragment = new NotificationsFragment();
Bundle arguments = new Bundle();
fragment.setArguments(arguments);
return fragment;
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_timeline, container, false);
@NonNull Context context = inflater.getContext(); // from inflater to silence warning
// Setup the SwipeRefreshLayout.
swipeRefreshLayout = rootView.findViewById(R.id.swipe_refresh_layout);
swipeRefreshLayout.setOnRefreshListener(this);
// Setup the 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());
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alwaysShowSensitiveMedia = preferences.getBoolean("alwaysShowSensitiveMedia", false);
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));
notifications.clear();
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();
if (activity == null) throw new AssertionError("Activity is null");
// MainActivity's layout is guaranteed to be inflated until onCreate returns.
TabLayout layout = activity.findViewById(R.id.tab_layout);
onTabSelectedListener = new TabLayout.OnTabSelectedListener() {
@Override
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public void onTabSelected(TabLayout.Tab tab) {}
@Override
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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. */
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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);
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ActionButtonActivity activity = (ActionButtonActivity) getActivity();
FloatingActionButton composeButton = activity.getActionButton();
if (composeButton != null) {
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() {
Activity activity = getActivity();
if (activity == null) {
Log.e(TAG, "Activity is null");
} else {
TabLayout tabLayout = activity.findViewById(R.id.tab_layout);
tabLayout.removeOnTabSelectedListener(onTabSelectedListener);
LocalBroadcastManager.getInstance(activity)
.unregisterReceiver(timelineReceiver);
}
super.onDestroyView();
}
@Override
public void onRefresh() {
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sendFetchNotificationsRequest(null, topId, FetchEnd.TOP, -1);
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}
@Override
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public void onReply(int position) {
super.reply(notifications.get(position).getAsRight().status);
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}
@Override
public void onReblog(final boolean reblog, final int position) {
final Notification notification = notifications.get(position).getAsRight();
final Status status = notification.status;
reblogWithCallback(status, reblog, new Callback<Status>() {
@Override
public void onResponse(@NonNull Call<Status> call, @NonNull retrofit2.Response<Status> response) {
if (response.isSuccessful()) {
status.reblogged = reblog;
if (status.reblog != null) {
status.reblog.reblogged = reblog;
}
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NotificationViewData.Concrete viewdata = (NotificationViewData.Concrete)notifications.getPairedItem(position);
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StatusViewData.Builder viewDataBuilder = new StatusViewData.Builder(viewdata.getStatusViewData());
viewDataBuilder.setReblogged(reblog);
NotificationViewData.Concrete newViewData = new NotificationViewData.Concrete(
viewdata.getType(), viewdata.getId(), viewdata.getAccount(),
viewDataBuilder.createStatusViewData(), viewdata.isExpanded());
notifications.setPairedItem(position, newViewData);
adapter.updateItemWithNotify(position, newViewData, false);
}
}
@Override
public void onFailure(@NonNull Call<Status> call, @NonNull Throwable t) {
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Log.d(getClass().getSimpleName(), "Failed to reblog status: " + status.id, t);
}
});
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}
@Override
public void onFavourite(final boolean favourite, final int position) {
final Notification notification = notifications.get(position).getAsRight();
final Status status = notification.status;
favouriteWithCallback(status, favourite, new Callback<Status>() {
@Override
public void onResponse(@NonNull Call<Status> call, @NonNull retrofit2.Response<Status> response) {
if (response.isSuccessful()) {
status.favourited = favourite;
if (status.reblog != null) {
status.reblog.favourited = favourite;
}
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NotificationViewData.Concrete viewdata = (NotificationViewData.Concrete)notifications.getPairedItem(position);
StatusViewData.Builder viewDataBuilder = new StatusViewData.Builder(viewdata.getStatusViewData());
viewDataBuilder.setFavourited(favourite);
NotificationViewData.Concrete newViewData = new NotificationViewData.Concrete(
viewdata.getType(), viewdata.getId(), viewdata.getAccount(),
viewDataBuilder.createStatusViewData(), viewdata.isExpanded());
notifications.setPairedItem(position, newViewData);
adapter.updateItemWithNotify(position, newViewData, false);
}
}
@Override
public void onFailure(@NonNull Call<Status> call, @NonNull Throwable t) {
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Log.d(getClass().getSimpleName(), "Failed to favourite status: " + status.id, t);
}
});
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}
@Override
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public void onMore(View view, int position) {
Notification notification = notifications.get(position).getAsRight();
super.more(notification.status, view, position);
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}
@Override
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public void onViewMedia(String[] urls, int urlIndex, Attachment.Type type,
View view) {
super.viewMedia(urls, urlIndex, type, view);
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}
@Override
public void onViewThread(int position) {
Notification notification = notifications.get(position).getAsRight();
super.viewThread(notification.status);
}
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@Override
public void onOpenReblog(int position) {
Notification notification = notifications.get(position).getAsRight();
onViewAccount(notification.account.id);
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}
@Override
public void onExpandedChange(boolean expanded, int position) {
NotificationViewData.Concrete old =
(NotificationViewData.Concrete) notifications.getPairedItem(position);
StatusViewData.Concrete statusViewData =
new StatusViewData.Builder(old.getStatusViewData())
.setIsExpanded(expanded)
.createStatusViewData();
NotificationViewData notificationViewData = new NotificationViewData.Concrete(old.getType(),
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old.getId(), old.getAccount(), statusViewData, expanded);
notifications.setPairedItem(position, notificationViewData);
adapter.updateItemWithNotify(position, notificationViewData, false);
}
@Override
public void onContentHiddenChange(boolean isShowing, int position) {
NotificationViewData.Concrete old =
(NotificationViewData.Concrete) notifications.getPairedItem(position);
StatusViewData.Concrete statusViewData =
new StatusViewData.Builder(old.getStatusViewData())
.setIsShowingSensitiveContent(isShowing)
.createStatusViewData();
NotificationViewData notificationViewData = new NotificationViewData.Concrete(old.getType(),
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old.getId(), old.getAccount(), statusViewData, old.isExpanded());
notifications.setPairedItem(position, notificationViewData);
adapter.updateItemWithNotify(position, notificationViewData, false);
}
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@Override
public void onLoadMore(int position) {
//check bounds before accessing list,
if (notifications.size() >= position && position > 0) {
Notification previous = notifications.get(position - 1).getAsRightOrNull();
Notification next = notifications.get(position + 1).getAsRightOrNull();
if (previous == null || next == null) {
Log.e(TAG, "Failed to load more, invalid placeholder position: " + position);
return;
}
sendFetchNotificationsRequest(previous.id, next.id, FetchEnd.MIDDLE, position);
NotificationViewData notificationViewData =
new NotificationViewData.Placeholder(true);
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notifications.setPairedItem(position, notificationViewData);
adapter.updateItemWithNotify(position, notificationViewData, false);
} else {
Log.d(TAG, "error loading more");
}
}
@Override
public void onViewTag(String tag) {
super.viewTag(tag);
}
@Override
public void onViewAccount(String id) {
super.viewAccount(id);
}
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@Override
public void onViewStatusForNotificationId(String notificationId) {
for (Either<Placeholder, Notification> either : notifications) {
Notification notification = either.getAsRightOrNull();
if (notification != null && notification.id.equals(notificationId)) {
super.viewThread(notification.status);
return;
}
}
Log.w(TAG, "Didn't find a notification for ID: " + notificationId);
}
@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<Either<Placeholder, Notification>> iterator = notifications.iterator();
while (iterator.hasNext()) {
Either<Placeholder, Notification> notification = iterator.next();
Notification maybeNotification = notification.getAsRightOrNull();
if (maybeNotification != null && maybeNotification.account.id.equals(accountId)) {
iterator.remove();
}
}
adapter.update(notifications.getPairedCopy());
}
private void onLoadMore() {
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sendFetchNotificationsRequest(bottomId, null, FetchEnd.BOTTOM, -1);
}
private void jumpToTop() {
layoutManager.scrollToPosition(0);
scrollListener.reset();
}
private void sendFetchNotificationsRequest(String fromId, String uptoId,
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final FetchEnd fetchEnd, final int pos) {
/* 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);
}
});
}
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Call<List<Notification>> call = mastodonApi.notifications(fromId, uptoId, LOAD_AT_ONCE);
call.enqueue(new Callback<List<Notification>>() {
@Override
public void onResponse(@NonNull Call<List<Notification>> call,
@NonNull Response<List<Notification>> response) {
if (response.isSuccessful()) {
String linkHeader = response.headers().get("Link");
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onFetchNotificationsSuccess(response.body(), linkHeader, fetchEnd, pos);
} else {
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onFetchNotificationsFailure(new Exception(response.message()), fetchEnd, pos);
}
}
@Override
public void onFailure(@NonNull Call<List<Notification>> call, @NonNull Throwable t) {
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onFetchNotificationsFailure((Exception) t, fetchEnd, pos);
}
});
callList.add(call);
}
private void onFetchNotificationsSuccess(List<Notification> notifications, String linkHeader,
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FetchEnd fetchEnd, int pos) {
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;
}
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case MIDDLE: {
replacePlaceholderWithNotifications(notifications, pos);
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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);
}
private void onFetchNotificationsFailure(Exception exception, FetchEnd fetchEnd, int position) {
swipeRefreshLayout.setRefreshing(false);
if (fetchEnd == FetchEnd.MIDDLE && !notifications.get(position).isRight()) {
NotificationViewData placeholderVD =
new NotificationViewData.Placeholder(false);
notifications.setPairedItem(position, placeholderVD);
adapter.updateItemWithNotify(position, placeholderVD, true);
}
Log.e(TAG, "Fetch failure: " + exception.getMessage());
fulfillAnyQueuedFetches(fetchEnd);
}
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private void update(@Nullable List<Notification> newNotifications, @Nullable String fromId,
@Nullable String uptoId) {
if (ListUtils.isEmpty(newNotifications)) {
return;
}
if (fromId != null) {
bottomId = fromId;
}
if (uptoId != null) {
topId = uptoId;
}
List<Either<Placeholder, Notification>> liftedNew =
liftNotificationList(newNotifications);
if (notifications.isEmpty()) {
notifications.addAll(liftedNew);
} else {
int index = notifications.indexOf(liftedNew.get(newNotifications.size() - 1));
for (int i = 0; i < index; i++) {
notifications.remove(0);
}
int newIndex = liftedNew.indexOf(notifications.get(0));
if (newIndex == -1) {
if (index == -1 && liftedNew.size() >= LOAD_AT_ONCE) {
liftedNew.add(Either.<Placeholder, Notification>left(Placeholder.getInstance()));
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}
notifications.addAll(0, liftedNew);
} else {
notifications.addAll(0, liftedNew.subList(0, newIndex));
}
}
adapter.update(notifications.getPairedCopy());
}
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private void addItems(List<Notification> newNotifications, @Nullable String fromId) {
if (ListUtils.isEmpty(newNotifications)) {
return;
}
if (fromId != null) {
bottomId = fromId;
}
int end = notifications.size();
List<Either<Placeholder, Notification>> liftedNew = liftNotificationList(newNotifications);
Either<Placeholder, Notification> last = notifications.get(end - 1);
if (last != null && liftedNew.indexOf(last) == -1) {
notifications.addAll(liftedNew);
List<NotificationViewData> newViewDatas = notifications.getPairedCopy()
.subList(notifications.size() - newNotifications.size(),
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notifications.size());
adapter.addItems(newViewDatas);
}
}
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 replacePlaceholderWithNotifications(List<Notification> newNotifications, int pos) {
// Remove placeholder
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notifications.remove(pos);
if (ListUtils.isEmpty(newNotifications)) {
adapter.update(notifications.getPairedCopy());
return;
}
List<Either<Placeholder, Notification>> liftedNew = liftNotificationList(newNotifications);
// If we fetched less posts than in the limit, it means that the hole is not filled
// If we fetched at least as much it means that there are more posts to load and we should
// insert new placeholder
if (newNotifications.size() >= LOAD_AT_ONCE) {
liftedNew.add(Either.<Placeholder, Notification>left(Placeholder.getInstance()));
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}
notifications.addAll(pos, liftedNew);
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adapter.update(notifications.getPairedCopy());
}
private final Function<Notification, Either<Placeholder, Notification>> notificationLifter =
new Function<Notification, Either<Placeholder, Notification>>() {
@Override
public Either<Placeholder, Notification> apply(Notification input) {
return Either.right(input);
}
};
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private List<Either<Placeholder, Notification>> liftNotificationList(List<Notification> list) {
return CollectionUtil.map(list, notificationLifter);
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}
private void fullyRefresh() {
adapter.clear();
notifications.clear();
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sendFetchNotificationsRequest(null, null, FetchEnd.TOP, -1);
}
}