91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#pragma once
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#include "storage/storage_user_photos.h"
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#include "base/weak_unique_ptr.h"
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class UserPhotosViewer;
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class UserPhotosSlice {
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public:
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using Key = Storage::UserPhotosKey;
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UserPhotosSlice(Key key);
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UserPhotosSlice(Key key, base::optional<int> fullCount);
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const Key &key() const { return _key; }
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base::optional<int> fullCount() const { return _fullCount; }
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base::optional<int> skippedBefore() const { return _skippedBefore; }
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int skippedAfter() const { return _skippedAfter; }
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base::optional<int> indexOf(PhotoId msgId) const;
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int size() const { return _ids.size(); }
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PhotoId operator[](int index) const;
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base::optional<int> distance(const Key &a, const Key &b) const;
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QString debug() const;
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private:
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Key _key;
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std::deque<PhotoId> _ids;
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base::optional<int> _fullCount;
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base::optional<int> _skippedBefore;
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int _skippedAfter = 0;
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friend class UserPhotosViewer;
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};
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class UserPhotosViewer :
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private base::Subscriber,
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public base::enable_weak_from_this {
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public:
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using Key = Storage::UserPhotosKey;
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UserPhotosViewer(Key key, int limitBefore, int limitAfter);
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void start();
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base::Observable<UserPhotosSlice> updated;
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private:
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using InitialResult = Storage::UserPhotosResult;
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using SliceUpdate = Storage::UserPhotosSliceUpdate;
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void loadInitial();
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void requestPhotos();
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void applyStoredResult(InitialResult &&result);
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void applyUpdate(const SliceUpdate &update);
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void sliceToLimits();
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void mergeSliceData(
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base::optional<int> count,
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const std::deque<PhotoId> &photoIds,
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base::optional<int> skippedBefore,
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int skippedAfter);
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Key _key;
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int _limitBefore = 0;
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int _limitAfter = 0;
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UserPhotosSlice _data;
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};
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