Added search to files and links shared media.

Telegram/SourceFiles/apiwrap.cpp

@@ -41,6 +41,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "storage/storage_shared_media.h"
 #include "storage/storage_user_photos.h"
 #include "history/history_sparse_ids.h"
+#include "history/history_search_controller.h"
 
 namespace {
 
@@ -1939,71 +1940,22 @@ void ApiWrap::requestSharedMedia(
 		return;
 	}
 
-	auto filter = [&] {
-		using Type = SharedMediaType;
-		switch (type) {
-		case Type::Photo:
-			return MTP_inputMessagesFilterPhotos();
-		case Type::Video:
-			return MTP_inputMessagesFilterVideo();
-		case Type::MusicFile:
-			return MTP_inputMessagesFilterMusic();
-		case Type::File:
-			return MTP_inputMessagesFilterDocument();
-		case Type::VoiceFile:
-			return MTP_inputMessagesFilterVoice();
-		case Type::RoundVoiceFile:
-			return MTP_inputMessagesFilterRoundVoice();
-		case Type::RoundFile:
-			return MTP_inputMessagesFilterRoundVideo();
-		case Type::GIF:
-			return MTP_inputMessagesFilterGif();
-		case Type::Link:
-			return MTP_inputMessagesFilterUrl();
-		case Type::ChatPhoto:
-			return MTP_inputMessagesFilterChatPhotos();
-		}
-		return MTP_inputMessagesFilterEmpty();
-	}();
-	if (filter.type() == mtpc_inputMessagesFilterEmpty) {
+	auto prepared = Api::PrepareSearchRequest(
+		peer,
+		type,
+		QString(),
+		messageId,
+		slice);
+	if (prepared.vfilter.type() == mtpc_inputMessagesFilterEmpty) {
 		return;
 	}
 
-	auto minId = 0;
-	auto maxId = 0;
-	auto limit = messageId ? kSharedMediaLimit : 0;
-	auto offsetId = [&] {
-		switch (slice) {
-		case SliceType::Before:
-		case SliceType::Around: return messageId;
-		case SliceType::After: return messageId + 1;
-		}
-		Unexpected("Slice type in ApiWrap::requestSharedMedia");
-	}();
-	auto addOffset = [&] {
-		switch (slice) {
-		case SliceType::Before: return 0;
-		case SliceType::Around: return -limit / 2;
-		case SliceType::After: return -limit;
-		}
-		Unexpected("Slice type in ApiWrap::requestSharedMedia");
-	}();
-
-	auto requestId = request(MTPmessages_Search(
-		MTP_flags(0),
-		peer->input,
-		MTPstring(),
-		MTP_inputUserEmpty(),
-		filter,
-		MTP_int(0),
-		MTP_int(0),
-		MTP_int(offsetId),
-		MTP_int(addOffset),
-		MTP_int(limit),
-		MTP_int(maxId),
-		MTP_int(minId)
-	)).done([this, peer, type, messageId, slice](const MTPmessages_Messages &result) {
-		_sharedMediaRequests.remove(std::make_tuple(peer, type, messageId, slice));
+	auto requestId = request(
+		std::move(prepared)
+	).done([this, peer, type, messageId, slice](
+			const MTPmessages_Messages &result) {
+		auto key = std::make_tuple(peer, type, messageId, slice);
+		_sharedMediaRequests.remove(key);
 		sharedMediaDone(peer, type, messageId, slice, result);
 	}).fail([this, key](const RPCError &error) {
 		_sharedMediaRequests.remove(key);
@@ -2017,74 +1969,18 @@ void ApiWrap::sharedMediaDone(
 		MsgId messageId,
 		SliceType slice,
 		const MTPmessages_Messages &result) {
-	auto fullCount = 0;
-	auto &messages = *[&] {
-		switch (result.type()) {
-		case mtpc_messages_messages: {
-			auto &d = result.c_messages_messages();
-			App::feedUsers(d.vusers);
-			App::feedChats(d.vchats);
-			fullCount = d.vmessages.v.size();
-			return &d.vmessages.v;
-		} break;
-
-		case mtpc_messages_messagesSlice: {
-			auto &d = result.c_messages_messagesSlice();
-			App::feedUsers(d.vusers);
-			App::feedChats(d.vchats);
-			fullCount = d.vcount.v;
-			return &d.vmessages.v;
-		} break;
-
-		case mtpc_messages_channelMessages: {
-			auto &d = result.c_messages_channelMessages();
-			if (auto channel = peer->asChannel()) {
-				channel->ptsReceived(d.vpts.v);
-			} else {
-				LOG(("API Error: received messages.channelMessages when no channel was passed! (ApiWrap::sharedMediaDone)"));
-			}
-			App::feedUsers(d.vusers);
-			App::feedChats(d.vchats);
-			fullCount = d.vcount.v;
-			return &d.vmessages.v;
-		} break;
-		}
-		Unexpected("messages.Messages type in sharedMediaDone()");
-	}();
-
-	auto noSkipRange = MsgRange { messageId, messageId };
-	auto messageIds = std::vector<MsgId>();
-	auto addType = NewMessageExisting;
-	messageIds.reserve(messages.size());
-	for (auto &message : messages) {
-		if (auto item = App::histories().addNewMessage(message, addType)) {
-			if (item->sharedMediaTypes().test(type)) {
-				auto itemId = item->id;
-				messageIds.push_back(itemId);
-				accumulate_min(noSkipRange.from, itemId);
-				accumulate_max(noSkipRange.till, itemId);
-			}
-		}
-	}
-	if (messageId && messageIds.empty()) {
-		noSkipRange = [&]() -> MsgRange {
-			switch (slice) {
-			case SliceType::Before: // All old loaded.
-				return { 0, noSkipRange.till };
-			case SliceType::Around: // All loaded.
-				return { 0, ServerMaxMsgId };
-			case SliceType::After: // All new loaded.
-				return { noSkipRange.from, ServerMaxMsgId };
-			}
-			Unexpected("Slice type in ApiWrap::sharedMediaDone");
-		}();
-	}
+	auto parsed = Api::ParseSearchResult(
+		peer,
+		type,
+		messageId,
+		slice,
+		result);
 	Auth().storage().add(Storage::SharedMediaAddSlice(
 		peer->id,
 		type,
-		std::move(messageIds),
-		noSkipRange,
-		fullCount
+		std::move(parsed.messageIds),
+		parsed.noSkipRange,
+		parsed.fullCount
 	));
 }
 

Telegram/SourceFiles/app.cpp

@@ -603,8 +603,8 @@ namespace {
 				}
 				if (updatedFrom) {
 					channel->mgInfo->migrateFromPtr = cdata;
-					if (History *h = App::historyLoaded(cdata->id)) {
-						if (History *hto = App::historyLoaded(channel->id)) {
+					if (auto h = App::historyLoaded(cdata->id)) {
+						if (auto hto = App::historyLoaded(channel->id)) {
 							if (!h->isEmpty()) {
 								h->clear(true);
 							}

Telegram/SourceFiles/auth_session.h

@@ -64,9 +64,6 @@ public:
 	base::Observable<void> &savedGifsUpdated() {
 		return _savedGifsUpdated;
 	}
-	base::Observable<not_null<History*>> &historyCleared() {
-		return _historyCleared;
-	}
 	base::Observable<void> &pendingHistoryResize() {
 		return _pendingHistoryResize;
 	}
@@ -78,23 +75,35 @@ public:
 		return _queryItemVisibility;
 	}
 	void markItemLayoutChanged(not_null<const HistoryItem*> item) {
-		_itemLayoutChanged.fire(std::move(item));
+		_itemLayoutChanged.fire_copy(item);
 	}
 	rpl::producer<not_null<const HistoryItem*>> itemLayoutChanged() const {
 		return _itemLayoutChanged.events();
 	}
 	void requestItemRepaint(not_null<const HistoryItem*> item) {
-		_itemRepaintRequest.fire(std::move(item));
+		_itemRepaintRequest.fire_copy(item);
 	}
 	rpl::producer<not_null<const HistoryItem*>> itemRepaintRequest() const {
 		return _itemRepaintRequest.events();
 	}
 	void markItemRemoved(not_null<const HistoryItem*> item) {
-		_itemRemoved.fire(std::move(item));
+		_itemRemoved.fire_copy(item);
 	}
 	rpl::producer<not_null<const HistoryItem*>> itemRemoved() const {
 		return _itemRemoved.events();
 	}
+	void markHistoryUnloaded(not_null<const History*> history) {
+		_historyUnloaded.fire_copy(history);
+	}
+	rpl::producer<not_null<const History*>> historyUnloaded() const {
+		return _historyUnloaded.events();
+	}
+	void markHistoryCleared(not_null<const History*> history) {
+		_historyCleared.fire_copy(history);
+	}
+	rpl::producer<not_null<const History*>> historyCleared() const {
+		return _historyCleared.events();
+	}
 	using MegagroupParticipant = std::tuple<
 		not_null<ChannelData*>,
 		not_null<UserData*>>;
@@ -241,12 +250,13 @@ private:
 	base::Observable<void> _moreChatsLoaded;
 	base::Observable<void> _stickersUpdated;
 	base::Observable<void> _savedGifsUpdated;
-	base::Observable<not_null<History*>> _historyCleared;
 	base::Observable<void> _pendingHistoryResize;
 	base::Observable<ItemVisibilityQuery> _queryItemVisibility;
 	rpl::event_stream<not_null<const HistoryItem*>> _itemLayoutChanged;
 	rpl::event_stream<not_null<const HistoryItem*>> _itemRepaintRequest;
 	rpl::event_stream<not_null<const HistoryItem*>> _itemRemoved;
+	rpl::event_stream<not_null<const History*>> _historyUnloaded;
+	rpl::event_stream<not_null<const History*>> _historyCleared;
 	rpl::event_stream<MegagroupParticipant> _megagroupParticipantRemoved;
 	rpl::event_stream<MegagroupParticipant> _megagroupParticipantAdded;
 

Telegram/SourceFiles/base/optional.h

@@ -75,8 +75,11 @@ public:
 		return *this;
 	}
 
+	bool has_value() const {
+		return !is<none_type>();
+	}
 	explicit operator bool() const {
-		return (get_if<none_type>(&_impl) == nullptr);
+		return has_value();
 	}
 	bool operator==(const optional_variant &other) const {
 		return _impl == other._impl;

Telegram/SourceFiles/base/unique_qptr.h

@@ -0,0 +1,122 @@
+/*
+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
+*/
+#pragma once
+
+namespace base {
+
+template <typename T>
+class unique_qptr {
+public:
+	unique_qptr() = default;
+	unique_qptr(std::nullptr_t) {
+	}
+	explicit unique_qptr(T *pointer)
+	: _object(pointer) {
+	}
+
+	unique_qptr(const unique_qptr &other) = delete;
+	unique_qptr &operator=(const unique_qptr &other) = delete;
+	unique_qptr(unique_qptr &&other)
+	: _object(base::take(other._object)) {
+	}
+	unique_qptr &operator=(unique_qptr &&other) {
+		if (_object != other._object) {
+			destroy();
+			_object = std::move(other._object);
+		}
+		return *this;
+	}
+
+	template <
+		typename U,
+		typename = std::enable_if_t<std::is_base_of_v<T, U>>>
+	unique_qptr(unique_qptr<U> &&other)
+	: _object(base::take(other._object)) {
+	}
+
+	template <
+		typename U,
+		typename = std::enable_if_t<std::is_base_of_v<T, U>>>
+	unique_qptr &operator=(unique_qptr<U> &&other) {
+		if (_object != other._object) {
+			destroy();
+			_object = std::move(other._object);
+		}
+		return *this;
+	}
+
+	unique_qptr &operator=(std::nullptr_t) {
+		destroy();
+		_object = nullptr;
+		return *this;
+	}
+
+	void reset(T *value) {
+		if (_object != value) {
+			destroy();
+			_object = value;
+		}
+	}
+
+	T *get() const {
+		return static_cast<T*>(_object.data());
+	}
+	operator T*() const {
+		return get();
+	}
+
+	T *release() {
+		return static_cast<T*>(base::take(_object).data());
+	}
+
+	explicit operator bool() const {
+		return _object != nullptr;
+	}
+
+	T *operator->() const {
+		return get();
+	}
+	T &operator*() const {
+		return *get();
+	}
+
+	void destroy() {
+		delete base::take(_object).data();
+	}
+
+	~unique_qptr() {
+		destroy();
+	}
+
+private:
+	template <typename U>
+	friend class unique_qptr;
+
+	QPointer<QObject> _object;
+
+};
+
+template <typename T, typename ...Args>
+inline unique_qptr<T> make_unique_q(Args &&...args) {
+	return unique_qptr<T>(new T(std::forward<Args>(args)...));
+}
+
+} // namespace base

Telegram/SourceFiles/history/history.cpp

@@ -2038,7 +2038,7 @@ void History::getReadyFor(MsgId msgId) {
 		return;
 	}
 	if (msgId == ShowAtUnreadMsgId && peer->migrateFrom()) {
-		if (History *h = App::historyLoaded(peer->migrateFrom()->id)) {
+		if (auto h = App::historyLoaded(peer->migrateFrom()->id)) {
 			if (h->unreadCount()) {
 				clear(true);
 				h->getReadyFor(msgId);
@@ -2217,7 +2217,9 @@ void History::clear(bool leaveItems) {
 	if (scrollTopItem) {
 		forgetScrollState();
 	}
-	if (!leaveItems) {
+	if (leaveItems) {
+		Auth().data().markHistoryUnloaded(this);
+	} else {
 		setLastMessage(nullptr);
 		notifies.clear();
 		auto &pending = Global::RefPendingRepaintItems();
@@ -2238,6 +2240,7 @@ void History::clear(bool leaveItems) {
 			}
 		}
 		Auth().storage().remove(Storage::SharedMediaRemoveAll(peer->id));
+		Auth().data().markHistoryCleared(this);
 	}
 	clearBlocks(leaveItems);
 	if (leaveItems) {
@@ -2263,9 +2266,6 @@ void History::clear(bool leaveItems) {
 			peer->asChannel()->mgInfo->markupSenders.clear();
 		}
 	}
-	if (leaveItems) {
-		Auth().data().historyCleared().notify(this, true);
-	}
 }
 
 void History::clearBlocks(bool leaveItems) {

Telegram/SourceFiles/history/history_inner_widget.cpp

@@ -20,6 +20,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 */
 #include "history/history_inner_widget.h"
 
+#include <rpl/merge.h>
 #include "styles/style_history.h"
 #include "core/file_utilities.h"
 #include "history/history_message.h"
@@ -110,10 +111,6 @@ HistoryInner::HistoryInner(
 	notifyIsBotChanged();
 
 	setMouseTracking(true);
-	Auth().data().itemRemoved()
-		| rpl::start_with_next(
-			[this](auto item) { itemRemoved(item); },
-			lifetime());
 	subscribe(_controller->gifPauseLevelChanged(), [this] {
 		if (!_controller->isGifPausedAtLeastFor(Window::GifPauseReason::Any)) {
 			update();
@@ -122,11 +119,19 @@ HistoryInner::HistoryInner(
 	subscribe(_controller->window()->dragFinished(), [this] {
 		mouseActionUpdate(QCursor::pos());
 	});
-	subscribe(Auth().data().historyCleared(), [this](not_null<History*> history) {
-		if (_history == history) {
+	Auth().data().itemRemoved()
+		| rpl::start_with_next(
+			[this](auto item) { itemRemoved(item); },
+			lifetime());
+	rpl::merge(
+		Auth().data().historyUnloaded(),
+		Auth().data().historyCleared())
+		| rpl::filter([this](not_null<const History*> history) {
+			return (_history == history);
+		})
+		| rpl::start_with_next([this] {
 			mouseActionCancel();
-		}
-	});
+		}, lifetime());
 }
 
 void HistoryInner::messagesReceived(PeerData *peer, const QVector<MTPMessage> &messages) {

Telegram/SourceFiles/history/history_search_controller.cpp

@@ -0,0 +1,307 @@
+/*
+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 "history/history_search_controller.h"
+
+#include "auth_session.h"
+
+namespace Api {
+namespace {
+
+constexpr auto kSharedMediaLimit = 100;
+constexpr auto kDefaultSearchTimeoutMs = TimeMs(200);
+
+} // namespace
+
+MTPmessages_Search PrepareSearchRequest(
+		not_null<PeerData*> peer,
+		Storage::SharedMediaType type,
+		const QString &query,
+		MsgId messageId,
+		SparseIdsLoadDirection direction) {
+	auto filter = [&] {
+		using Type = Storage::SharedMediaType;
+		switch (type) {
+		case Type::Photo:
+			return MTP_inputMessagesFilterPhotos();
+		case Type::Video:
+			return MTP_inputMessagesFilterVideo();
+		case Type::MusicFile:
+			return MTP_inputMessagesFilterMusic();
+		case Type::File:
+			return MTP_inputMessagesFilterDocument();
+		case Type::VoiceFile:
+			return MTP_inputMessagesFilterVoice();
+		case Type::RoundVoiceFile:
+			return MTP_inputMessagesFilterRoundVoice();
+		case Type::RoundFile:
+			return MTP_inputMessagesFilterRoundVideo();
+		case Type::GIF:
+			return MTP_inputMessagesFilterGif();
+		case Type::Link:
+			return MTP_inputMessagesFilterUrl();
+		case Type::ChatPhoto:
+			return MTP_inputMessagesFilterChatPhotos();
+		}
+		return MTP_inputMessagesFilterEmpty();
+	}();
+
+	auto minId = 0;
+	auto maxId = 0;
+	auto limit = messageId ? kSharedMediaLimit : 0;
+	auto offsetId = [&] {
+		switch (direction) {
+		case SparseIdsLoadDirection::Before:
+		case SparseIdsLoadDirection::Around: return messageId;
+		case SparseIdsLoadDirection::After: return messageId + 1;
+		}
+		Unexpected("Direction in PrepareSearchRequest");
+	}();
+	auto addOffset = [&] {
+		switch (direction) {
+		case SparseIdsLoadDirection::Before: return 0;
+		case SparseIdsLoadDirection::Around: return -limit / 2;
+		case SparseIdsLoadDirection::After: return -limit;
+		}
+		Unexpected("Direction in PrepareSearchRequest");
+	}();
+
+	return MTPmessages_Search(
+		MTP_flags(0),
+		peer->input,
+		MTP_string(query),
+		MTP_inputUserEmpty(),
+		filter,
+		MTP_int(0),
+		MTP_int(0),
+		MTP_int(offsetId),
+		MTP_int(addOffset),
+		MTP_int(limit),
+		MTP_int(maxId),
+		MTP_int(minId));
+}
+
+SearchResult ParseSearchResult(
+		not_null<PeerData*> peer,
+		Storage::SharedMediaType type,
+		MsgId messageId,
+		SparseIdsLoadDirection direction,
+		const MTPmessages_Messages &data) {
+	auto result = SearchResult();
+	auto &messages = *[&] {
+		switch (data.type()) {
+		case mtpc_messages_messages: {
+			auto &d = data.c_messages_messages();
+			App::feedUsers(d.vusers);
+			App::feedChats(d.vchats);
+			result.fullCount = d.vmessages.v.size();
+			return &d.vmessages.v;
+		} break;
+
+		case mtpc_messages_messagesSlice: {
+			auto &d = data.c_messages_messagesSlice();
+			App::feedUsers(d.vusers);
+			App::feedChats(d.vchats);
+			result.fullCount = d.vcount.v;
+			return &d.vmessages.v;
+		} break;
+
+		case mtpc_messages_channelMessages: {
+			auto &d = data.c_messages_channelMessages();
+			if (auto channel = peer->asChannel()) {
+				channel->ptsReceived(d.vpts.v);
+			} else {
+				LOG(("API Error: received messages.channelMessages when no channel was passed! (ParseSearchResult)"));
+			}
+			App::feedUsers(d.vusers);
+			App::feedChats(d.vchats);
+			result.fullCount = d.vcount.v;
+			return &d.vmessages.v;
+		} break;
+		}
+		Unexpected("messages.Messages type in ParseSearchResult()");
+	}();
+
+	result.noSkipRange = MsgRange{ messageId, messageId };
+	auto addType = NewMessageExisting;
+	result.messageIds.reserve(messages.size());
+	for (auto &message : messages) {
+		if (auto item = App::histories().addNewMessage(message, addType)) {
+			if ((type == Storage::SharedMediaType::kCount)
+				|| item->sharedMediaTypes().test(type)) {
+				auto itemId = item->id;
+				result.messageIds.push_back(itemId);
+				accumulate_min(result.noSkipRange.from, itemId);
+				accumulate_max(result.noSkipRange.till, itemId);
+			}
+		}
+	}
+	if (messageId && result.messageIds.empty()) {
+		result.noSkipRange = [&]() -> MsgRange {
+			switch (direction) {
+			case SparseIdsLoadDirection::Before: // All old loaded.
+				return { 0, result.noSkipRange.till };
+			case SparseIdsLoadDirection::Around: // All loaded.
+				return { 0, ServerMaxMsgId };
+			case SparseIdsLoadDirection::After: // All new loaded.
+				return { result.noSkipRange.from, ServerMaxMsgId };
+			}
+			Unexpected("Direction in ParseSearchResult");
+		}();
+	}
+	return result;
+}
+
+SingleSearchController::SingleSearchController(const Query &query)
+: _query(query)
+, _peerData(App::peer(query.peerId))
+, _migratedData(query.migratedPeerId
+	? base::make_optional(Data(App::peer(query.migratedPeerId)))
+	: base::none) {
+}
+
+rpl::producer<SparseIdsMergedSlice> SingleSearchController::idsSlice(
+		SparseIdsMergedSlice::UniversalMsgId aroundId,
+		int limitBefore,
+		int limitAfter) {
+	auto createSimpleViewer = [this](
+			PeerId peerId,
+			SparseIdsSlice::Key simpleKey,
+			int limitBefore,
+			int limitAfter) {
+		return simpleIdsSlice(
+			peerId,
+			simpleKey,
+			limitBefore,
+			limitAfter);
+	};
+	return SparseIdsMergedSlice::CreateViewer(
+		SparseIdsMergedSlice::Key(
+			_query.peerId,
+			_query.migratedPeerId,
+			aroundId),
+		limitBefore,
+		limitAfter,
+		std::move(createSimpleViewer));
+}
+
+rpl::producer<SparseIdsSlice> SingleSearchController::simpleIdsSlice(
+		PeerId peerId,
+		MsgId aroundId,
+		int limitBefore,
+		int limitAfter) {
+	Expects(peerId != 0);
+	Expects(IsServerMsgId(aroundId) || (aroundId == 0));
+	Expects((aroundId != 0)
+		|| (limitBefore == 0 && limitAfter == 0));
+	Expects((_query.peerId == peerId)
+		|| (_query.migratedPeerId == peerId));
+
+	auto listData = (peerId == _query.peerId)
+		? &_peerData
+		: &*_migratedData;
+	return [=](auto consumer) {
+		auto lifetime = rpl::lifetime();
+		auto builder = lifetime.make_state<SparseIdsSliceBuilder>(
+			aroundId,
+			limitBefore,
+			limitAfter);
+		builder->insufficientAround()
+			| rpl::start_with_next([=](
+					const SparseIdsSliceBuilder::AroundData &data) {
+				requestMore(data, listData);
+			}, lifetime);
+
+		auto pushNextSnapshot = [=] {
+			consumer.put_next(builder->snapshot());
+		};
+
+		listData->list.sliceUpdated()
+			| rpl::filter([=](const SliceUpdate &update) {
+				return builder->applyUpdate(update);
+			})
+			| rpl::start_with_next(pushNextSnapshot, lifetime);
+
+		Auth().data().itemRemoved()
+			| rpl::filter([=](not_null<const HistoryItem*> item) {
+				return (item->history()->peer->id == peerId);
+			})
+			| rpl::filter([=](not_null<const HistoryItem*> item) {
+				return builder->removeOne(item->id);
+			})
+			| rpl::start_with_next(pushNextSnapshot, lifetime);
+
+		Auth().data().historyCleared()
+			| rpl::filter([=](not_null<const History*> history) {
+				return (history->peer->id == peerId);
+			})
+			| rpl::filter([=] { return builder->removeAll(); })
+			| rpl::start_with_next(pushNextSnapshot, lifetime);
+
+		builder->checkInsufficient();
+
+		return lifetime;
+	};
+}
+
+void SingleSearchController::requestMore(
+		const SparseIdsSliceBuilder::AroundData &key,
+		Data *listData) {
+	if (listData->requests.contains(key)) {
+		return;
+	}
+	auto requestId = request(PrepareSearchRequest(
+		listData->peer,
+		_query.type,
+		_query.query,
+		key.aroundId,
+		key.direction)
+	).done([=](const MTPmessages_Messages &result) {
+		auto parsed = ParseSearchResult(
+			listData->peer,
+			_query.type,
+			key.aroundId,
+			key.direction,
+			result);
+		listData->list.addSlice(
+			std::move(parsed.messageIds),
+			parsed.noSkipRange,
+			parsed.fullCount);
+	}).send();
+
+	listData->requests.emplace(key, requestId);
+}
+
+DelayedSearchController::DelayedSearchController() {
+	_timer.setCallback([this] { setQueryFast(_nextQuery); });
+}
+
+void DelayedSearchController::setQuery(const Query &query) {
+	setQuery(
+		query,
+		query.query.isEmpty() ? 0 : kDefaultSearchTimeoutMs);
+}
+
+void DelayedSearchController::setQueryFast(const Query &query) {
+	_controller.setQuery(query);
+	_sourceChanges.fire({});
+}
+
+} // namespace Api

Telegram/SourceFiles/history/history_search_controller.h

@@ -0,0 +1,166 @@
+/*
+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
+*/
+#pragma once
+
+#include "mtproto/sender.h"
+#include "history/history_sparse_ids.h"
+#include "storage/storage_sparse_ids_list.h"
+#include "storage/storage_shared_media.h"
+
+namespace Api {
+
+struct SearchResult {
+	std::vector<MsgId> messageIds;
+	MsgRange noSkipRange;
+	int fullCount = 0;
+};
+
+MTPmessages_Search PrepareSearchRequest(
+	not_null<PeerData*> peer,
+	Storage::SharedMediaType type,
+	const QString &query,
+	MsgId messageId,
+	SparseIdsLoadDirection direction);
+
+SearchResult ParseSearchResult(
+	not_null<PeerData*> peer,
+	Storage::SharedMediaType type,
+	MsgId messageId,
+	SparseIdsLoadDirection direction,
+	const MTPmessages_Messages &data);
+
+class SingleSearchController : private MTP::Sender {
+public:
+	struct Query {
+		using MediaType = Storage::SharedMediaType;
+
+		PeerId peerId = 0;
+		PeerId migratedPeerId = 0;
+		MediaType type = MediaType::kCount;
+		QString query;
+		// from_id, min_date, max_date
+	};
+
+	SingleSearchController(const Query &query);
+
+	rpl::producer<SparseIdsMergedSlice> idsSlice(
+		SparseIdsMergedSlice::UniversalMsgId aroundId,
+		int limitBefore,
+		int limitAfter);
+
+	Query query() const {
+		return _query;
+	}
+
+private:
+	struct Data {
+		explicit Data(not_null<PeerData*> peer) : peer(peer) {
+		}
+
+		not_null<PeerData*> peer;
+		Storage::SparseIdsList list;
+		base::flat_map<
+			SparseIdsSliceBuilder::AroundData,
+			mtpRequestId> requests;
+	};
+	using SliceUpdate = Storage::SparseIdsSliceUpdate;
+
+	rpl::producer<SparseIdsSlice> simpleIdsSlice(
+		PeerId peerId,
+		MsgId aroundId,
+		int limitBefore,
+		int limitAfter);
+	void requestMore(
+		const SparseIdsSliceBuilder::AroundData &key,
+		Data *listData);
+
+	Query _query;
+	Data _peerData;
+	base::optional<Data> _migratedData;
+
+};
+
+class SearchController {
+public:
+	using Query = SingleSearchController::Query;
+	void setQuery(const Query &query) {
+		_controller = SingleSearchController(query);
+	}
+
+	Query query() const {
+		return _controller ? _controller->query() : Query();
+	}
+
+	rpl::producer<SparseIdsMergedSlice> idsSlice(
+			SparseIdsMergedSlice::UniversalMsgId aroundId,
+			int limitBefore,
+			int limitAfter) {
+		Expects(_controller.has_value());
+		return _controller->idsSlice(
+			aroundId,
+			limitBefore,
+			limitAfter);
+	}
+
+private:
+	base::optional<SingleSearchController> _controller;
+
+};
+
+class DelayedSearchController {
+public:
+	DelayedSearchController();
+
+	using Query = SingleSearchController::Query;
+	void setQuery(const Query &query);
+	void setQuery(const Query &query, TimeMs delay) {
+		_nextQuery = query;
+		_timer.callOnce(delay);
+	}
+	void setQueryFast(const Query &query);
+
+	Query currentQuery() const {
+		return _controller.query();
+	}
+
+	rpl::producer<SparseIdsMergedSlice> idsSlice(
+			SparseIdsMergedSlice::UniversalMsgId aroundId,
+			int limitBefore,
+			int limitAfter) {
+		return _controller.idsSlice(
+			aroundId,
+			limitBefore,
+			limitAfter);
+	}
+
+	rpl::producer<> sourceChanged() const {
+		return _sourceChanges.events();
+	}
+
+private:
+	SearchController _controller;
+	Query _nextQuery;
+	base::Timer _timer;
+	rpl::event_stream<> _sourceChanges;
+
+};
+
+} // namespace Api

Telegram/SourceFiles/history/history_shared_media.cpp

@@ -48,7 +48,7 @@ inline MediaOverviewType SharedMediaTypeToOverview(Type type) {
 } // namespace
 
 base::optional<Storage::SharedMediaType> SharedMediaOverviewType(
-	Storage::SharedMediaType type) {
+		Storage::SharedMediaType type) {
 	if (SharedMediaTypeToOverview(type) != OverviewCount) {
 		return type;
 	}
@@ -56,13 +56,22 @@ base::optional<Storage::SharedMediaType> SharedMediaOverviewType(
 }
 
 void SharedMediaShowOverview(
-	Storage::SharedMediaType type,
-	not_null<History*> history) {
+		Storage::SharedMediaType type,
+		not_null<History*> history) {
 	if (SharedMediaOverviewType(type)) {
 		Ui::showPeerOverview(history, SharedMediaTypeToOverview(type));
 	}
 }
 
+bool SharedMediaAllowSearch(Storage::SharedMediaType type) {
+	switch (type) {
+	case Type::MusicFile:
+	case Type::File:
+	case Type::Link: return true;
+	default: return false;
+	}
+}
+
 rpl::producer<SparseIdsSlice> SharedMediaViewer(
 		Storage::SharedMediaKey key,
 		int limitBefore,
@@ -83,8 +92,8 @@ rpl::producer<SparseIdsSlice> SharedMediaViewer(
 			Auth().api().requestSharedMedia(
 				peer,
 				type,
-				data.first,
-				data.second);
+				data.aroundId,
+				data.direction);
 		};
 		builder->insufficientAround()
 			| rpl::start_with_next(requestMediaAround, lifetime);
@@ -120,9 +129,7 @@ rpl::producer<SparseIdsSlice> SharedMediaViewer(
 			| rpl::filter([=](const AllRemoved &update) {
 				return (update.peerId == key.peerId);
 			})
-			| rpl::filter([=](const AllRemoved &update) {
-				return builder->removeAll();
-			})
+			| rpl::filter([=] { return builder->removeAll(); })
 			| rpl::start_with_next(pushNextSnapshot, lifetime);
 
 		using Result = Storage::SharedMediaResult;
@@ -147,52 +154,25 @@ rpl::producer<SparseIdsMergedSlice> SharedMediaMergedViewer(
 		SharedMediaMergedKey key,
 		int limitBefore,
 		int limitAfter) {
-	Expects(IsServerMsgId(key.mergedKey.universalId)
-		|| (key.mergedKey.universalId == 0)
-		|| (IsServerMsgId(ServerMaxMsgId + key.mergedKey.universalId) && key.mergedKey.migratedPeerId != 0));
-	Expects((key.mergedKey.universalId != 0)
-		|| (limitBefore == 0 && limitAfter == 0));
-
-	return [=](auto consumer) {
-		if (!key.mergedKey.migratedPeerId) {
-			return SharedMediaViewer(
-				Storage::SharedMediaKey(
-					key.mergedKey.peerId,
-					key.type,
-					SparseIdsMergedSlice::PartKey(key.mergedKey)),
-				limitBefore,
-				limitAfter
-			) | rpl::start_with_next([=](SparseIdsSlice &&part) {
-				consumer.put_next(SparseIdsMergedSlice(
-					key.mergedKey,
-					std::move(part),
-					base::none));
-			});
-		}
-		return rpl::combine(
-			SharedMediaViewer(
-				Storage::SharedMediaKey(
-					key.mergedKey.peerId,
-					key.type,
-					SparseIdsMergedSlice::PartKey(key.mergedKey)),
-				limitBefore,
-				limitAfter),
-			SharedMediaViewer(
-				Storage::SharedMediaKey(
-					key.mergedKey.migratedPeerId,
-					key.type,
-					SparseIdsMergedSlice::MigratedKey(key.mergedKey)),
-				limitBefore,
-				limitAfter)
-		) | rpl::start_with_next([=](
-				SparseIdsSlice &&part,
-				SparseIdsSlice &&migrated) {
-			consumer.put_next(SparseIdsMergedSlice(
-				key.mergedKey,
-				std::move(part),
-				std::move(migrated)));
-		});
+	auto createSimpleViewer = [=](
+			PeerId peerId,
+			SparseIdsSlice::Key simpleKey,
+			int limitBefore,
+			int limitAfter) {
+		return SharedMediaViewer(
+			Storage::SharedMediaKey(
+				peerId,
+				key.type,
+				simpleKey),
+			limitBefore,
+			limitAfter
+		);
 	};
+	return SparseIdsMergedSlice::CreateViewer(
+		key.mergedKey,
+		limitBefore,
+		limitAfter,
+		std::move(createSimpleViewer));
 }
 
 SharedMediaWithLastSlice::SharedMediaWithLastSlice(Key key)

Telegram/SourceFiles/history/history_shared_media.h

@@ -29,6 +29,7 @@ base::optional<Storage::SharedMediaType> SharedMediaOverviewType(
 void SharedMediaShowOverview(
 	Storage::SharedMediaType type,
 	not_null<History*> history);
+bool SharedMediaAllowSearch(Storage::SharedMediaType type);
 
 rpl::producer<SparseIdsSlice> SharedMediaViewer(
 	Storage::SharedMediaKey key,

Telegram/SourceFiles/history/history_sparse_ids.cpp

@@ -20,6 +20,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 */
 #include "history/history_sparse_ids.h"
 
+#include <rpl/combine.h>
 #include "storage/storage_sparse_ids_list.h"
 
 SparseIdsSlice::SparseIdsSlice(
@@ -389,3 +390,49 @@ SparseIdsSlice SparseIdsSliceBuilder::snapshot() const {
 		_skippedBefore,
 		_skippedAfter);
 }
+
+rpl::producer<SparseIdsMergedSlice> SparseIdsMergedSlice::CreateViewer(
+		SparseIdsMergedSlice::Key key,
+		int limitBefore,
+		int limitAfter,
+		base::lambda<SimpleViewerFunction> simpleViewer) {
+	Expects(IsServerMsgId(key.universalId)
+		|| (key.universalId == 0)
+		|| (IsServerMsgId(ServerMaxMsgId + key.universalId) && key.migratedPeerId != 0));
+	Expects((key.universalId != 0)
+		|| (limitBefore == 0 && limitAfter == 0));
+
+	return [=](auto consumer) {
+		auto partViewer = simpleViewer(
+			key.peerId,
+			SparseIdsMergedSlice::PartKey(key),
+			limitBefore,
+			limitAfter
+		);
+		if (!key.migratedPeerId) {
+			return std::move(partViewer)
+				| rpl::start_with_next([=](SparseIdsSlice &&part) {
+					consumer.put_next(SparseIdsMergedSlice(
+						key,
+						std::move(part),
+						base::none));
+				});
+		}
+		auto migratedViewer = simpleViewer(
+			key.migratedPeerId,
+			SparseIdsMergedSlice::MigratedKey(key),
+			limitBefore,
+			limitAfter);
+		return rpl::combine(
+			std::move(partViewer),
+			std::move(migratedViewer)
+		) | rpl::start_with_next([=](
+				SparseIdsSlice &&part,
+				SparseIdsSlice &&migrated) {
+			consumer.put_next(SparseIdsMergedSlice(
+				key,
+				std::move(part),
+				std::move(migrated)));
+		});
+	};
+}

Telegram/SourceFiles/history/history_sparse_ids.h

@@ -101,16 +101,26 @@ public:
 	base::optional<int> distance(const Key &a, const Key &b) const;
 	base::optional<UniversalMsgId> nearest(UniversalMsgId id) const;
 
+	using SimpleViewerFunction = rpl::producer<SparseIdsSlice>(
+		PeerId peerId,
+		SparseIdsSlice::Key simpleKey,
+		int limitBefore,
+		int limitAfter);
+	static rpl::producer<SparseIdsMergedSlice> CreateViewer(
+		SparseIdsMergedSlice::Key key,
+		int limitBefore,
+		int limitAfter,
+		base::lambda<SimpleViewerFunction> simpleViewer);
+
+private:
 	static SparseIdsSlice::Key PartKey(const Key &key) {
 		return (key.universalId < 0) ? 1 : key.universalId;
 	}
 	static SparseIdsSlice::Key MigratedKey(const Key &key) {
 		return (key.universalId < 0)
-				? (ServerMaxMsgId + key.universalId)
-				: (key.universalId > 0) ? (ServerMaxMsgId - 1) : 0;
+			? (ServerMaxMsgId + key.universalId)
+			: (key.universalId > 0) ? (ServerMaxMsgId - 1) : 0;
 	}
-
-private:
 	static base::optional<SparseIdsSlice> MigratedSlice(const Key &key) {
 		return key.migratedPeerId
 			? base::make_optional(SparseIdsSlice())
@@ -176,7 +186,17 @@ public:
 	bool removeAll();
 
 	void checkInsufficient();
-	using AroundData = std::pair<MsgId, SparseIdsLoadDirection>;
+	struct AroundData {
+		MsgId aroundId = 0;
+		SparseIdsLoadDirection direction
+			= SparseIdsLoadDirection::Around;
+
+		inline bool operator<(const AroundData &other) const {
+			return (aroundId < other.aroundId)
+				|| ((aroundId == other.aroundId)
+					&& (direction < other.direction));
+		}
+	};
 	auto insufficientAround() const {
 		return _insufficientAround.events();
 	}

Telegram/SourceFiles/info/info.style

@@ -404,3 +404,13 @@ infoCommonGroupsList: PeerList(infoMembersList) {
 		statusPosition: point(79px, 31px);
 	}
 }
+
+infoMediaSearch: SearchFieldRow {
+	height: 44px;
+	padding: margins(8px, 6px, 8px, 6px);
+	field: contactsSearchField;
+	fieldIcon: boxFieldSearchIcon;
+	fieldIconSkip: 36px;
+	fieldCancel: contactsSearchCancel;
+	fieldCancelSkip: 40px;
+}

Telegram/SourceFiles/info/media/info_media_inner_widget.cpp

@@ -29,6 +29,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "ui/widgets/discrete_sliders.h"
 #include "ui/widgets/shadow.h"
 #include "ui/wrap/vertical_layout.h"
+#include "ui/search_field_controller.h"
 #include "styles/style_info.h"
 #include "lang/lang_keys.h"
 
@@ -230,11 +231,36 @@ object_ptr<ListWidget> InnerWidget::setupList(
 		not_null<Window::Controller*> controller,
 		not_null<PeerData*> peer,
 		Type type) {
+	if (SharedMediaAllowSearch(type)) {
+		_searchFieldController
+			= std::make_unique<Ui::SearchFieldController>();
+		_searchFieldController->queryValue()
+			| rpl::start_with_next([=](QString &&query) {
+				_searchController.setQuery(produceSearchQuery(
+					peer,
+					type,
+					std::move(query)));
+			}, _searchFieldController->lifetime());
+		_searchField = _searchFieldController->createView(
+			this,
+			st::infoMediaSearch);
+		_searchField->resizeToWidth(width());
+		_searchField->show();
+	} else {
+		_searchField = nullptr;
+		_searchFieldController = nullptr;
+	}
+	_searchController.setQueryFast(produceSearchQuery(peer, type));
 	auto result = object_ptr<ListWidget>(
 		this,
 		controller,
 		peer,
-		type);
+		type,
+		produceListSource());
+	_searchController.sourceChanged()
+		| rpl::start_with_next([widget = result.data()]{
+			widget->restart();
+		}, result->lifetime());
 	result->heightValue()
 		| rpl::start_with_next(
 			[this] { refreshHeight(); },
@@ -268,6 +294,49 @@ void InnerWidget::cancelSelection() {
 	_list->cancelSelection();
 }
 
+InnerWidget::~InnerWidget() = default;
+
+ListWidget::Source InnerWidget::produceListSource() {
+	return [this](
+			SparseIdsMergedSlice::UniversalMsgId aroundId,
+			int limitBefore,
+			int limitAfter) {
+		auto query = _searchController.currentQuery();
+		if (query.query.isEmpty()) {
+			return SharedMediaMergedViewer(
+				SharedMediaMergedKey(
+					SparseIdsMergedSlice::Key(
+						query.peerId,
+						query.migratedPeerId,
+						aroundId),
+					query.type),
+				limitBefore,
+				limitAfter);
+		}
+		return _searchController.idsSlice(
+			aroundId,
+			limitBefore,
+			limitAfter);
+	};
+}
+
+auto InnerWidget::produceSearchQuery(
+		not_null<PeerData*> peer,
+		Type type,
+		QString &&query) const -> SearchQuery {
+	auto result = SearchQuery();
+	result.type = type;
+	result.peerId = peer->id;
+	result.query = std::move(query);
+	result.migratedPeerId = [&] {
+		if (auto migrateFrom = peer->migrateFrom()) {
+			return migrateFrom->id;
+		}
+		return PeerId(0);
+	}();
+	return result;
+}
+
 int InnerWidget::resizeGetHeight(int newWidth) {
 	_inResize = true;
 	auto guard = gsl::finally([this] { _inResize = false; });
@@ -276,6 +345,9 @@ int InnerWidget::resizeGetHeight(int newWidth) {
 		_otherTypes->resizeToWidth(newWidth);
 		_otherTabsShadow->resizeToWidth(newWidth);
 	}
+	if (_searchField) {
+		_searchField->resizeToWidth(newWidth);
+	}
 	_list->resizeToWidth(newWidth);
 	return recountHeight();
 }
@@ -294,6 +366,10 @@ int InnerWidget::recountHeight() {
 		top += _otherTypes->heightNoMargins() - st::lineWidth;
 		_otherTabsShadow->moveToLeft(0, top);
 	}
+	if (_searchField) {
+		_searchField->moveToLeft(0, top);
+		top += _searchField->heightNoMargins() - st::lineWidth;
+	}
 	if (_list) {
 		_list->moveToLeft(0, top);
 		top += _list->heightNoMargins();

Telegram/SourceFiles/info/media/info_media_inner_widget.h

@@ -22,10 +22,13 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 
 #include "ui/rp_widget.h"
 #include "info/media/info_media_widget.h"
+#include "info/media/info_media_list_widget.h"
+#include "history/history_search_controller.h"
 
 namespace Ui {
 class SettingsSlider;
 class VerticalLayout;
+class SearchFieldController;
 } // namespace Ui
 
 namespace Info {
@@ -58,6 +61,8 @@ public:
 	rpl::producer<SelectedItems> selectedListValue() const;
 	void cancelSelection();
 
+	~InnerWidget();
+
 protected:
 	int resizeGetHeight(int newWidth) override;
 	void visibleTopBottomUpdated(
@@ -73,6 +78,13 @@ private:
 	void createTabs();
 	void switchToTab(Memento &&memento);
 
+	using SearchQuery = Api::DelayedSearchController::Query;
+	ListWidget::Source produceListSource();
+	SearchQuery produceSearchQuery(
+		not_null<PeerData*> peer,
+		Type type,
+		QString &&query = QString()) const;
+
 	not_null<Window::Controller*> controller() const;
 
 	object_ptr<ListWidget> setupList(
@@ -85,10 +97,13 @@ private:
 	Ui::SettingsSlider *_otherTabs = nullptr;
 	object_ptr<Ui::VerticalLayout> _otherTypes = { nullptr };
 	object_ptr<Ui::PlainShadow> _otherTabsShadow = { nullptr };
+	std::unique_ptr<Ui::SearchFieldController> _searchFieldController;
+	Ui::RpWidget *_searchField = nullptr;
 	object_ptr<ListWidget> _list = { nullptr };
 
 	rpl::event_stream<int> _scrollToRequests;
 	rpl::event_stream<rpl::producer<SelectedItems>> _selectedLists;
+	Api::DelayedSearchController _searchController;
 
 };
 

Telegram/SourceFiles/info/media/info_media_list_widget.cpp

@@ -540,11 +540,13 @@ ListWidget::ListWidget(
 	QWidget *parent,
 	not_null<Window::Controller*> controller,
 	not_null<PeerData*> peer,
-	Type type)
+	Type type,
+	Source source)
 : RpWidget(parent)
 , _controller(controller)
 , _peer(peer)
 , _type(type)
+, _source(std::move(source))
 , _slice(sliceKey(_universalAroundId)) {
 	setAttribute(Qt::WA_MouseTracking);
 	start();
@@ -574,6 +576,20 @@ void ListWidget::start() {
 		}, lifetime());
 }
 
+void ListWidget::restart() {
+	mouseActionCancel();
+
+	_overLayout = nullptr;
+	_sections.clear();
+	_layouts.clear();
+
+	_universalAroundId = kDefaultAroundId;
+	_idsLimit = kMinimalIdsLimit;
+	_slice = SparseIdsMergedSlice(sliceKey(_universalAroundId));
+
+	refreshViewer();
+}
+
 void ListWidget::itemRemoved(not_null<const HistoryItem*> item) {
 	if (isMyItem(item)) {
 		auto universalId = GetUniversalId(item);
@@ -753,12 +769,7 @@ SparseIdsMergedSlice::Key ListWidget::sliceKey(
 
 void ListWidget::refreshViewer() {
 	_viewerLifetime.destroy();
-	SharedMediaMergedViewer(
-		SharedMediaMergedKey(
-			sliceKey(_universalAroundId),
-			_type),
-		_idsLimit,
-		_idsLimit)
+	_source(_universalAroundId, _idsLimit, _idsLimit)
 		| rpl::start_with_next([this](
 				SparseIdsMergedSlice &&slice) {
 			_slice = std::move(slice);

Telegram/SourceFiles/info/media/info_media_list_widget.h

@@ -47,11 +47,17 @@ using UniversalMsgId = int32;
 class ListWidget : public Ui::RpWidget {
 public:
 	using Type = Widget::Type;
+	using Source = base::lambda<
+		rpl::producer<SparseIdsMergedSlice>(
+			SparseIdsMergedSlice::UniversalMsgId aroundId,
+			int limitBefore,
+			int limitAfter)>;
 	ListWidget(
 		QWidget *parent,
 		not_null<Window::Controller*> controller,
 		not_null<PeerData*> peer,
-		Type type);
+		Type type,
+		Source source);
 
 	not_null<Window::Controller*> controller() const {
 		return _controller;
@@ -63,6 +69,8 @@ public:
 		return _type;
 	}
 
+	void restart();
+
 	rpl::producer<int> scrollToRequests() const {
 		return _scrollToRequests.events();
 	}
@@ -275,6 +283,7 @@ private:
 	not_null<Window::Controller*> _controller;
 	not_null<PeerData*> _peer;
 	Type _type = Type::Photo;
+	Source _source;
 
 	static constexpr auto kMinimalIdsLimit = 16;
 	static constexpr auto kDefaultAroundId = (ServerMaxMsgId - 1);

Telegram/SourceFiles/mtproto/sender.h

@@ -319,8 +319,10 @@ private:
 		RequestWrap(RequestWrap &&other) : _id(base::take(other._id)) {
 		}
 		RequestWrap &operator=(RequestWrap &&other) {
-			cancelRequest();
-			_id = base::take(other._id);
+			if (_id != other._id) {
+				cancelRequest();
+				_id = base::take(other._id);
+			}
 			return *this;
 		}
 

Telegram/SourceFiles/ui/rp_widget.h

@@ -23,9 +23,27 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include <rpl/event_stream.h>
 #include <rpl/map.h>
 #include <rpl/distinct_until_changed.h>
+#include "base/unique_qptr.h"
 
 namespace Ui {
 
+template <typename Widget, typename ...Args>
+inline base::unique_qptr<Widget> CreateObject(Args &&...args) {
+	return base::make_unique_q<Widget>(
+		nullptr,
+		std::forward<Args>(args)...);
+}
+
+template <typename Widget, typename Parent, typename ...Args>
+inline Widget *CreateChild(
+		Parent *parent,
+		Args &&...args) {
+	Expects(parent != nullptr);
+	return base::make_unique_q<Widget>(
+		parent,
+		std::forward<Args>(args)...).release();
+}
+
 template <typename Widget>
 using RpWidgetParent = std::conditional_t<
 	std::is_same_v<Widget, QWidget>,

Telegram/SourceFiles/ui/search_field_controller.cpp

@@ -0,0 +1,108 @@
+/*
+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 "ui/search_field_controller.h"
+
+#include "styles/style_widgets.h"
+#include "ui/wrap/padding_wrap.h"
+#include "ui/widgets/input_fields.h"
+#include "ui/widgets/shadow.h"
+#include "ui/widgets/buttons.h"
+#include "lang/lang_keys.h"
+
+namespace Ui {
+
+object_ptr<Ui::RpWidget> SearchFieldController::createView(
+		QWidget *parent,
+		const style::SearchFieldRow &st) {
+	auto result = object_ptr<Ui::FixedHeightWidget>(
+		parent,
+		st.height);
+
+	auto cancel = CreateChild<Ui::CrossButton>(
+		result.data(),
+		st.fieldCancel);
+	cancel->addClickHandler([=] { clearQuery(); });
+
+	auto field = CreateChild<Ui::InputField>(
+		result.data(),
+		st.field,
+		langFactory(lng_dlg_filter),
+		_query.current());
+	field->show();
+	field->connect(field, &Ui::InputField::changed, [=] {
+		setQueryFromField(field->getLastText());
+	});
+	field->connect(field, &Ui::InputField::cancelled, [=] {
+		clearQuery();
+	});
+
+	auto shadow = CreateChild<Ui::PlainShadow>(result.data());
+	shadow->show();
+
+	result->widthValue()
+		| rpl::start_with_next([=, &st](int newWidth) {
+			auto availableWidth = newWidth
+				- st.fieldIconSkip
+				- st.fieldCancelSkip;
+			field->setGeometryToLeft(
+				st.padding.left() + st.fieldIconSkip,
+				st.padding.top(),
+				availableWidth,
+				field->height());
+			cancel->moveToRight(0, 0);
+			shadow->setGeometry(
+				0,
+				st.height - st::lineWidth,
+				newWidth,
+				st::lineWidth);
+		}, result->lifetime());
+	result->paintRequest()
+		| rpl::start_with_next([=, &st] {
+			Painter p(_view.wrap);
+			st.fieldIcon.paint(
+				p,
+				st.padding.left(),
+				st.padding.top(),
+				_view.wrap->width());
+		}, result->lifetime());
+
+	_view.wrap.reset(result);
+	_view.cancel = cancel;
+	_view.field = field;
+	return std::move(result);
+}
+
+void SearchFieldController::setQueryFromField(const QString &query) {
+	_query = query;
+	if (_view.cancel) {
+		_view.cancel->toggleAnimated(!query.isEmpty());
+	}
+}
+
+void SearchFieldController::clearQuery() {
+	if (_view.field) {
+		_view.field->setText(QString());
+	} else {
+		setQueryFromField(QString());
+	}
+}
+
+} // namespace Ui

Telegram/SourceFiles/ui/search_field_controller.h

@@ -0,0 +1,66 @@
+/*
+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
+*/
+#pragma once
+
+#include <rpl/variable.h>
+#include "ui/rp_widget.h"
+#include "base/unique_qptr.h"
+
+namespace style {
+struct SearchFieldRow;
+} // namespace style
+
+namespace Ui {
+
+class CrossButton;
+class InputField;
+
+class SearchFieldController {
+public:
+	object_ptr<Ui::RpWidget> createView(
+		QWidget *parent,
+		const style::SearchFieldRow &st);
+
+	rpl::producer<QString> queryValue() const {
+		return _query.value();
+	}
+
+	rpl::lifetime &lifetime() {
+		return _lifetime;
+	}
+
+private:
+	void setQueryFromField(const QString &query);
+	void clearQuery();
+
+	struct View {
+		base::unique_qptr<Ui::RpWidget> wrap;
+		Ui::InputField *field = nullptr;
+		Ui::CrossButton *cancel = nullptr;
+	};
+	View _view;
+	rpl::variable<QString> _query;
+
+	rpl::lifetime _lifetime;
+
+};
+
+} // namespace Ui

Telegram/SourceFiles/ui/widgets/input_fields.h

@@ -237,7 +237,11 @@ class FlatInput : public TWidgetHelper<QLineEdit>, private base::Subscriber {
 	Q_OBJECT
 
 public:
-	FlatInput(QWidget *parent, const style::FlatInput &st, base::lambda<QString()> placeholderFactory = base::lambda<QString()>(), const QString &val = QString());
+	FlatInput(
+		QWidget *parent,
+		const style::FlatInput &st,
+		base::lambda<QString()> placeholderFactory = nullptr,
+		const QString &val = QString());
 
 	void updatePlaceholder();
 	void setPlaceholder(base::lambda<QString()> placeholderFactory);

Telegram/SourceFiles/ui/widgets/widgets.style

@@ -1122,3 +1122,12 @@ InfoTopBar {
 	mediaForward: IconButton;
 	mediaDelete: IconButton;
 }
+SearchFieldRow {
+	height: pixels;
+	padding: margins;
+	field: InputField;
+	fieldIcon: icon;
+	fieldIconSkip: pixels;
+	fieldCancel: CrossButton;
+	fieldCancelSkip: pixels;
+}

Telegram/gyp/telegram_sources.txt

@@ -28,6 +28,7 @@
 <(src_loc)/base/type_traits.h
 <(src_loc)/base/unique_any.h
 <(src_loc)/base/unique_function.h
+<(src_loc)/base/unique_qptr.h
 <(src_loc)/base/variant.h
 <(src_loc)/base/virtual_method.h
 <(src_loc)/base/weak_unique_ptr.h
@@ -197,6 +198,8 @@
 <(src_loc)/history/history_media_types.h
 <(src_loc)/history/history_message.cpp
 <(src_loc)/history/history_message.h
+<(src_loc)/history/history_search_controller.cpp
+<(src_loc)/history/history_search_controller.h
 <(src_loc)/history/history_service.cpp
 <(src_loc)/history/history_service.h
 <(src_loc)/history/history_service_layout.cpp
@@ -598,6 +601,8 @@
 <(src_loc)/ui/images.cpp
 <(src_loc)/ui/images.h
 <(src_loc)/ui/rp_widget.h
+<(src_loc)/ui/search_field_controller.cpp
+<(src_loc)/ui/search_field_controller.h
 <(src_loc)/ui/special_buttons.cpp
 <(src_loc)/ui/special_buttons.h
 <(src_loc)/ui/twidget.cpp