tdesktop/Telegram/SourceFiles/storage/storage_user_photos.cpp

180 lines
4.8 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop 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.
It 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.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#include "storage/storage_user_photos.h"
#include "base/task_queue.h"
namespace Storage {
void UserPhotos::List::addNew(PhotoId photoId) {
if (!base::contains(_photoIds, photoId)) {
_photoIds.push_back(photoId);
if (_count) {
++*_count;
}
sendUpdate();
}
}
void UserPhotos::List::addSlice(
std::vector<PhotoId> &&photoIds,
int count) {
for (auto photoId : photoIds) {
if (!base::contains(_photoIds, photoId)) {
_photoIds.push_front(photoId);
}
}
_count = count;
if ((_count && *_count < _photoIds.size()) || photoIds.empty()) {
_count = _photoIds.size();
}
sendUpdate();
}
void UserPhotos::List::removeOne(PhotoId photoId) {
auto position = ranges::find(_photoIds, photoId);
if (position == _photoIds.end()) {
_count = base::none;
} else {
if (_count) {
--*_count;
}
_photoIds.erase(position);
}
sendUpdate();
}
void UserPhotos::List::removeAfter(PhotoId photoId) {
auto position = ranges::find(_photoIds, photoId);
if (position == _photoIds.end()) {
_count = base::none;
_photoIds.clear();
} else {
if (_count) {
*_count -= (_photoIds.end() - position);
}
_photoIds.erase(position, _photoIds.end());
}
sendUpdate();
}
void UserPhotos::List::sendUpdate() {
auto update = SliceUpdate();
update.photoIds = &_photoIds;
update.count = _count;
_sliceUpdated.fire(std::move(update));
}
rpl::producer<UserPhotosResult> UserPhotos::List::query(
UserPhotosQuery &&query) const {
return [this, query = std::move(query)](auto consumer) {
auto result = UserPhotosResult {};
result.count = _count;
auto position = ranges::find(_photoIds, query.key.photoId);
if (position != _photoIds.end()) {
auto haveBefore = int(position - _photoIds.begin());
auto haveEqualOrAfter = int(_photoIds.end() - position);
auto before = qMin(haveBefore, query.limitBefore);
auto equalOrAfter = qMin(haveEqualOrAfter, query.limitAfter + 1);
result.photoIds = std::deque<PhotoId>(
position - before,
position + equalOrAfter);
auto skippedInIds = (haveBefore - before);
result.skippedBefore = _count
| func::add(-int(_photoIds.size()) + skippedInIds);
result.skippedBefore = haveBefore - before;
result.skippedAfter = (haveEqualOrAfter - equalOrAfter);
consumer.put_next(std::move(result));
} else if (_count) {
consumer.put_next(std::move(result));
}
consumer.put_done();
return rpl::lifetime();
};
}
auto UserPhotos::List::sliceUpdated() const -> rpl::producer<SliceUpdate> {
return _sliceUpdated.events();
}
rpl::producer<UserPhotosSliceUpdate> UserPhotos::sliceUpdated() const {
return _sliceUpdated.events();
}
std::map<UserId, UserPhotos::List>::iterator UserPhotos::enforceLists(UserId user) {
auto result = _lists.find(user);
if (result != _lists.end()) {
return result;
}
result = _lists.emplace(user, List {}).first;
result->second.sliceUpdated(
) | rpl::start_with_next([this, user](
const SliceUpdate &update) {
_sliceUpdated.fire(UserPhotosSliceUpdate(
user,
update.photoIds,
update.count));
}, _lifetime);
return result;
}
void UserPhotos::add(UserPhotosAddNew &&query) {
auto userIt = enforceLists(query.userId);
userIt->second.addNew(query.photoId);
}
void UserPhotos::add(UserPhotosAddSlice &&query) {
auto userIt = enforceLists(query.userId);
userIt->second.addSlice(
std::move(query.photoIds),
query.count);
}
void UserPhotos::remove(UserPhotosRemoveOne &&query) {
auto userIt = _lists.find(query.userId);
if (userIt != _lists.end()) {
userIt->second.removeOne(query.photoId);
}
}
void UserPhotos::remove(UserPhotosRemoveAfter &&query) {
auto userIt = _lists.find(query.userId);
if (userIt != _lists.end()) {
userIt->second.removeAfter(query.photoId);
}
}
rpl::producer<UserPhotosResult> UserPhotos::query(UserPhotosQuery &&query) const {
auto userIt = _lists.find(query.key.userId);
if (userIt != _lists.end()) {
return userIt->second.query(std::move(query));
}
return [](auto consumer) {
consumer.put_done();
return rpl::lifetime();
};
}
} // namespace Storage