Load similar channels correctly.

Telegram/SourceFiles/api/api_chat_participants.cpp

@@ -587,9 +587,6 @@ void ChatParticipants::requestSelf(not_null<ChannelData*> channel) {
 			} else {
 				history->owner().histories().requestDialogEntry(history);
 			}
-			if (dateChanged) {
-				loadSimilarChannels(channel);
-			}
 		}
 	};
 	_selfParticipantRequests.emplace(channel);
@@ -713,9 +710,17 @@ void ChatParticipants::loadSimilarChannels(not_null<ChannelData*> channel) {
 	_similar[channel].requestId = _api.request(
 		MTPchannels_GetChannelRecommendations(channel->inputChannel)
 	).done([=](const MTPmessages_Chats &result) {
-		_similar[channel] = {
+		auto &similar = _similar[channel];
-			.list = ParseSimilar(channel, result),
+		auto list = ParseSimilar(channel, result);
-		};
+		if (similar.list == list) {
+			return;
+		}
+		similar.list = std::move(list);
+		if (const auto history = channel->owner().historyLoaded(channel)) {
+			if (const auto item = history->joinedMessageInstance()) {
+				history->owner().requestItemResize(item);
+			}
+		}
 		_similarLoaded.fire_copy(channel);
 	}).send();
 }

Telegram/SourceFiles/api/api_chat_participants.h

@@ -120,6 +120,8 @@ public:
 		not_null<ChannelData*> channel,
 		not_null<PeerData*> participant);
 
+	void loadSimilarChannels(not_null<ChannelData*> channel);
+
 	[[nodiscard]] const std::vector<not_null<ChannelData*>> &similar(
 		not_null<ChannelData*> channel);
 	[[nodiscard]] auto similarLoaded() const
@@ -131,8 +133,6 @@ private:
 		mtpRequestId requestId = 0;
 	};
 
-	void loadSimilarChannels(not_null<ChannelData*> channel);
-
 	MTP::Sender _api;
 
 	using PeerRequests = base::flat_map<PeerData*, mtpRequestId>;

Telegram/SourceFiles/apiwrap.cpp

@@ -1739,6 +1739,10 @@ void ApiWrap::joinChannel(not_null<ChannelData*> channel) {
 		}).send();
 
 		_channelAmInRequests.emplace(channel, requestId);
+
+		using Flag = ChannelDataFlag;
+		chatParticipants().loadSimilarChannels(channel);
+		channel->setFlags(channel->flags() | Flag::SimilarExpanded);
 	}
 }
 

Telegram/SourceFiles/data/data_channel.cpp

@@ -175,7 +175,7 @@ void ChannelData::setFlags(ChannelDataFlags which) {
 			session().changes().peerUpdated(this, UpdateFlag::Migration);
 		}
 	}
-	if (diff & (Flag::Forum | Flag::CallNotEmpty)) {
+	if (diff & (Flag::Forum | Flag::CallNotEmpty | Flag::SimilarExpanded)) {
 		if (const auto history = this->owner().historyLoaded(this)) {
 			if (diff & Flag::CallNotEmpty) {
 				history->updateChatListEntry();
@@ -189,6 +189,11 @@ void ChannelData::setFlags(ChannelDataFlags which) {
 					}
 				}
 			}
+			if (diff & Flag::SimilarExpanded) {
+				if (const auto item = history->joinedMessageInstance()) {
+					history->owner().requestItemResize(item);
+				}
+			}
 		}
 	}
 	if (const auto raw = taken.get()) {

Telegram/SourceFiles/data/data_channel.h

@@ -64,6 +64,7 @@ enum class ChannelDataFlag {
 	HasUnreadStories = (1 << 28),
 	CanGetStatistics = (1 << 29),
 	ViewAsMessages = (1 << 30),
+	SimilarExpanded = (1 << 31),
 };
 inline constexpr bool is_flag_type(ChannelDataFlag) { return true; };
 using ChannelDataFlags = base::flags<ChannelDataFlag>;

Telegram/SourceFiles/history/history.cpp

@@ -3190,6 +3190,7 @@ void History::insertMessageToBlocks(not_null<HistoryItem*> item) {
 				const auto lastDate = chatListTimeId();
 				if (!lastDate || itemDate >= lastDate) {
 					setLastMessage(item);
+					owner().notifyHistoryChangeDelayed(this);
 				}
 				return;
 			}
@@ -3227,6 +3228,10 @@ void History::checkLocalMessages() {
 	}
 }
 
+HistoryItem *History::joinedMessageInstance() const {
+	return _joinedMessage;
+}
+
 void History::removeJoinedMessage() {
 	if (_joinedMessage) {
 		_joinedMessage->destroy();

Telegram/SourceFiles/history/history.h

@@ -99,6 +99,8 @@ public:
 	not_null<History*> migrateToOrMe() const;
 	History *migrateFrom() const;
 	MsgRange rangeForDifferenceRequest() const;
+
+	HistoryItem *joinedMessageInstance() const;
 	void checkLocalMessages();
 	void removeJoinedMessage();
 

Telegram/SourceFiles/history/view/history_view_service_message.cpp

@@ -639,6 +639,12 @@ TextState Service::textState(QPoint point, StateRequest request) const {
 	} else if (mediaDisplayed) {
 		g.setHeight(g.height() - (st::msgServiceMargin.top() + media->height()));
 	}
+	const auto mediaLeft = st::msgServiceMargin.left()
+		+ (media ? ((g.width() - media->width()) / 2) : 0);
+	const auto mediaTop = st::msgServiceMargin.top()
+		+ g.height()
+		+ st::msgServiceMargin.top();
+	const auto mediaPoint = point - QPoint(mediaLeft, mediaTop);
 	auto trect = g.marginsAdded(-st::msgServicePadding);
 	if (trect.contains(point)) {
 		auto textRequest = request.forText();
@@ -667,10 +673,12 @@ TextState Service::textState(QPoint point, StateRequest request) const {
 				}
 			} else if (const auto same = item->Get<HistoryServiceSameBackground>()) {
 				result.link = same->lnk;
+			} else if (media && data()->showSimilarChannels()) {
+				result = media->textState(mediaPoint, request);
 			}
 		}
-	} else if (mediaDisplayed) {
+	} else if (mediaDisplayed && point.y() >= mediaTop) {
-		result = media->textState(point - QPoint(st::msgServiceMargin.left() + (g.width() - media->width()) / 2, st::msgServiceMargin.top() + g.height() + st::msgServiceMargin.top()), request);
+		result = media->textState(mediaPoint, request);
 	}
 	return result;
 }

Telegram/SourceFiles/history/view/media/history_view_similar_channels.cpp

@@ -142,6 +142,9 @@ void SimilarChannels::clickHandlerPressedChanged(
 }
 
 void SimilarChannels::draw(Painter &p, const PaintContext &context) const {
+	if (!_toggled) {
+		return;
+	}
 	const auto large = Ui::BubbleCornerRounding::Large;
 	const auto geometry = QRect(0, 0, width(), height());
 	Ui::PaintBubble(
@@ -334,6 +337,23 @@ void SimilarChannels::validateParticipansBg(const Channel &channel) const {
 	channel.participantsBg = std::move(result);
 }
 
+ClickHandlerPtr SimilarChannels::ensureToggleLink() const {
+	if (_toggleLink) {
+		return _toggleLink;
+	}
+	_toggleLink = std::make_shared<LambdaClickHandler>(crl::guard(this, [=](
+			ClickContext context) {
+		const auto channel = history()->peer->asChannel();
+		Assert(channel != nullptr);
+		using Flag = ChannelDataFlag;
+		const auto flags = channel->flags();
+		channel->setFlags((flags & Flag::SimilarExpanded)
+			? (flags & ~Flag::SimilarExpanded)
+			: (flags | Flag::SimilarExpanded));
+	}));
+	return _toggleLink;
+}
+
 void SimilarChannels::ensureCacheReady(QSize size) const {
 	const auto ratio = style::DevicePixelRatio();
 	if (_roundedCache.size() != size * ratio) {
@@ -352,6 +372,10 @@ TextState SimilarChannels::textState(
 		QPoint point,
 		StateRequest request) const {
 	auto result = TextState();
+	if (point.y() < 0 && !_empty) {
+		result.link = ensureToggleLink();
+		return result;
+	}
 	result.horizontalScroll = (_scrollMax > 0);
 	const auto skip = st::chatSimilarTitlePosition;
 	const auto viewWidth = _hasViewAll ? (_viewAllWidth + 2 * skip.x()) : 0;
@@ -362,7 +386,7 @@ TextState SimilarChannels::textState(
 			const auto channel = parent()->history()->peer->asChannel();
 			Assert(channel != nullptr);
 			_viewAllLink = std::make_shared<LambdaClickHandler>([=](
-				ClickContext context) {
+					ClickContext context) {
 				Assert(channel != nullptr);
 				const auto api = &channel->session().api();
 				const auto &list = api->chatParticipants().similar(channel);
@@ -396,8 +420,12 @@ QSize SimilarChannels::countOptimalSize() {
 
 	_channels.clear();
 	const auto api = &channel->session().api();
+	api->chatParticipants().loadSimilarChannels(channel);
 	const auto similar = api->chatParticipants().similar(channel);
-	if (similar.empty()) {
+	_empty = similar.empty() ? 1 : 0;
+	using Flag = ChannelDataFlag;
+	_toggled = (channel->flags() & Flag::SimilarExpanded) ? 1 : 0;
+	if (_empty || !_toggled) {
 		return {};
 	}
 
@@ -441,7 +469,7 @@ QSize SimilarChannels::countOptimalSize() {
 	_title = tr::lng_similar_channels_title(tr::now);
 	_titleWidth = st::chatSimilarTitle->width(_title);
 	_viewAll = tr::lng_similar_channels_view_all(tr::now);
-	_viewAllWidth = st::normalFont->width(_viewAll);
+	_viewAllWidth = std::max(st::normalFont->width(_viewAll), 0);
 	const auto count = int(_channels.size());
 	const auto desired = (count ? (x - skip) : x)
 		- st::chatSimilarPadding.left();
@@ -451,7 +479,7 @@ QSize SimilarChannels::countOptimalSize() {
 	const auto titleSkip = st::chatSimilarTitlePosition.x();
 	const auto min = _titleWidth + 2 * titleSkip;
 	const auto limited = std::max(
-		std::min(_fullWidth, st::chatSimilarWidthMax),
+		std::min(int(_fullWidth), st::chatSimilarWidthMax),
 		min);
 	if (limited > _fullWidth) {
 		const auto shift = (limited - _fullWidth) / 2;
@@ -463,7 +491,10 @@ QSize SimilarChannels::countOptimalSize() {
 }
 
 QSize SimilarChannels::countCurrentSize(int newWidth) {
-	_scrollMax = std::max(_fullWidth - newWidth, 0);
+	if (!_toggled) {
+		return {};
+	}
+	_scrollMax = std::max(int(_fullWidth) - newWidth, 0);
 	_scrollLeft = std::clamp(_scrollLeft, uint32(), _scrollMax);
 	_hasViewAll = (_scrollMax != 0) ? 1 : 0;
 	return { newWidth, minHeight() };

Telegram/SourceFiles/history/view/media/history_view_similar_channels.h

@@ -49,7 +49,7 @@ public:
 		return true;
 	}
 	bool isDisplayed() const override {
-		return !_channels.empty();
+		return !_empty && _toggled;
 	}
 
 	void unloadHeavyPart() override;
@@ -74,6 +74,7 @@ private:
 
 	void ensureCacheReady(QSize size) const;
 	void validateParticipansBg(const Channel &channel) const;
+	[[nodiscard]] ClickHandlerPtr ensureToggleLink() const;
 
 	QSize countOptimalSize() override;
 	QSize countCurrentSize(int newWidth) override;
@@ -83,8 +84,10 @@ private:
 	mutable std::array<QImage, 4> _roundedCorners;
 	mutable QPoint _lastPoint;
 	int _titleWidth = 0;
-	int _viewAllWidth = 0;
+	uint32 _viewAllWidth : 15 = 0;
-	int _fullWidth = 0;
+	uint32 _fullWidth : 15 = 0;
+	uint32 _empty : 1 = 0;
+	mutable uint32 _toggled : 1 = 0;
 	uint32 _scrollLeft : 15 = 0;
 	uint32 _scrollMax : 15 = 0;
 	uint32 _hasViewAll : 1 = 0;
@@ -92,6 +95,7 @@ private:
 
 	std::vector<Channel> _channels;
 	mutable ClickHandlerPtr _viewAllLink;
+	mutable ClickHandlerPtr _toggleLink;
 
 };