Don't show downloads bar while message is visible.

Telegram/SourceFiles/data/data_download_manager.cpp

@@ -105,6 +105,25 @@ void DownloadManager::trackSession(not_null<Main::Session*> session) {
 	}, data.lifetime);
 }
 
+void DownloadManager::itemVisibilitiesUpdated(
+		not_null<Main::Session*> session) {
+	const auto i = _sessions.find(session);
+	if (i == end(_sessions)
+		|| i->second.downloading.empty()
+		|| !i->second.downloading.front().hiddenByView) {
+		return;
+	}
+	for (const auto &id : i->second.downloading) {
+		if (!session->data().queryItemVisibility(id.object.item)) {
+			for (auto &id : i->second.downloading) {
+				id.hiddenByView = false;
+			}
+			_loadingListChanges.fire({});
+			return;
+		}
+	}
+}
+
 int64 DownloadManager::computeNextStartDate() {
 	const auto now = base::unixtime::now();
 	if (_lastStartedBase != now) {
@@ -140,11 +159,15 @@ void DownloadManager::addLoading(DownloadObject object) {
 		return;
 	}
 
+	const auto shownExists = !data.downloading.empty()
+		&& !data.downloading.front().hiddenByView;
 	data.downloading.push_back({
 		.object = object,
 		.started = computeNextStartDate(),
 		.path = path,
 		.total = size,
+		.hiddenByView = (!shownExists
+			&& item->history()->owner().queryItemVisibility(item)),
 	});
 	_loading.emplace(item);
 	_loadingDocuments.emplace(object.document);
@@ -908,6 +931,9 @@ rpl::producer<Ui::DownloadBarContent> MakeDownloadBarContent() {
 			auto content = Ui::DownloadBarContent();
 			auto single = (const Data::DownloadObject*) nullptr;
 			for (const auto id : manager.loadingList()) {
+				if (id->hiddenByView) {
+					break;
+				}
 				if (!single) {
 					single = &id->object;
 				}

Telegram/SourceFiles/data/data_download_manager.h

@@ -71,6 +71,7 @@ struct DownloadingId {
 	QString path;
 	int ready = 0;
 	int total = 0;
+	bool hiddenByView = false;
 	bool done = false;
 };
 
@@ -80,6 +81,7 @@ public:
 	~DownloadManager();
 
 	void trackSession(not_null<Main::Session*> session);
+	void itemVisibilitiesUpdated(not_null<Main::Session*> session);
 
 	[[nodiscard]] DownloadDate computeNextStartDate();
 

Telegram/SourceFiles/data/data_session.cpp

@@ -44,6 +44,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_chat.h"
 #include "data/data_user.h"
 #include "data/data_file_origin.h"
+#include "data/data_download_manager.h"
 #include "data/data_photo.h"
 #include "data/data_document.h"
 #include "data/data_web_page.h"
@@ -1373,6 +1374,24 @@ void Session::changeMessageId(PeerId peerId, MsgId wasId, MsgId nowId) {
 	Ensures(ok);
 }
 
+bool Session::queryItemVisibility(not_null<HistoryItem*> item) const {
+	auto result = false;
+	_itemVisibilityQueries.fire({ item, &result });
+	return result;
+}
+
+[[nodiscard]] auto Session::itemVisibilityQueries() const
+-> rpl::producer<Session::ItemVisibilityQuery> {
+	return _itemVisibilityQueries.events();
+}
+
+void Session::itemVisibilitiesUpdated() {
+	// This could be rewritten in a more generic form, like:
+	// rpl::producer<> itemVisibilitiesUpdates()
+	// if someone else requires those methods, using fast for now.
+	Core::App().downloadManager().itemVisibilitiesUpdated(_session);
+}
+
 void Session::notifyItemIdChange(IdChange event) {
 	const auto item = event.item;
 	changeMessageId(item->history()->peer->id, event.oldId, item->id);

Telegram/SourceFiles/data/data_session.h

@@ -227,9 +227,10 @@ public:
 		not_null<HistoryItem*> item;
 		not_null<bool*> isVisible;
 	};
-	[[nodiscard]] base::Observable<ItemVisibilityQuery> &queryItemVisibility() {
-		return _queryItemVisibility;
-	}
+	[[nodiscard]] bool queryItemVisibility(not_null<HistoryItem*> item) const;
+	[[nodiscard]] rpl::producer<ItemVisibilityQuery> itemVisibilityQueries() const;
+	void itemVisibilitiesUpdated();
+
 	struct IdChange {
 		not_null<HistoryItem*> item;
 		MsgId oldId = 0;
@@ -839,7 +840,7 @@ private:
 	rpl::event_stream<Data::Folder*> _chatsListChanged;
 	rpl::event_stream<not_null<UserData*>> _userIsBotChanges;
 	rpl::event_stream<not_null<PeerData*>> _botCommandsChanges;
-	base::Observable<ItemVisibilityQuery> _queryItemVisibility;
+	rpl::event_stream<ItemVisibilityQuery> _itemVisibilityQueries;
 	rpl::event_stream<IdChange> _itemIdChanges;
 	rpl::event_stream<not_null<const HistoryItem*>> _itemLayoutChanges;
 	rpl::event_stream<not_null<const ViewElement*>> _viewLayoutChanges;

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp

@@ -300,20 +300,24 @@ InnerWidget::InnerWidget(
 			}
 		}
 	}, lifetime());
-	subscribe(session().data().queryItemVisibility(), [=](
+	session().data().itemVisibilityQueries(
+	) | rpl::filter([=](
+			const Data::Session::ItemVisibilityQuery &query) {
+		return (_history == query.item->history())
+			&& query.item->isAdminLogEntry()
+			&& isVisible();
+	}) | rpl::start_with_next([=](
 			const Data::Session::ItemVisibilityQuery &query) {
-		if (_history != query.item->history()
-			|| !query.item->isAdminLogEntry()
-			|| !isVisible()) {
-			return;
-		}
 		if (const auto view = viewForItem(query.item)) {
 			auto top = itemTop(view);
-			if (top >= 0 && top + view->height() > _visibleTop && top < _visibleBottom) {
+			if (top >= 0
+				&& top + view->height() > _visibleTop
+				&& top < _visibleBottom) {
 				*query.isVisible = true;
 			}
 		}
-	});
+	}, lifetime());
+
 	updateEmptyText();
 
 	requestAdmins();
@@ -355,6 +359,7 @@ void InnerWidget::visibleTopBottomUpdated(
 		scrollDateHideByTimer();
 	}
 	_controller->floatPlayerAreaUpdated();
+	session().data().itemVisibilitiesUpdated();
 }
 
 void InnerWidget::updateVisibleTopItem() {

Telegram/SourceFiles/history/history_widget.cpp

@@ -760,13 +760,15 @@ HistoryWidget::HistoryWidget(
 		updateNotifyControls();
 	}, lifetime());
 
-	subscribe(session().data().queryItemVisibility(), [=](
+	session().data().itemVisibilityQueries(
+	) | rpl::filter([=](
+			const Data::Session::ItemVisibilityQuery &query) {
+		return !_a_show.animating()
+			&& (_history == query.item->history())
+			&& (query.item->mainView() != nullptr)
+			&& isVisible();
+	}) | rpl::start_with_next([=](
 			const Data::Session::ItemVisibilityQuery &query) {
-		if (_a_show.animating()
-			|| _history != query.item->history()
-			|| !query.item->mainView() || !isVisible()) {
-			return;
-		}
 		if (const auto view = query.item->mainView()) {
 			auto top = _list->itemTop(view);
 			if (top >= 0) {
@@ -777,7 +779,8 @@ HistoryWidget::HistoryWidget(
 				}
 			}
 		}
-	});
+	}, lifetime());
+
 	_topBar->membersShowAreaActive(
 	) | rpl::start_with_next([=](bool active) {
 		setMembersShowAreaActive(active);
@@ -2301,6 +2304,7 @@ void HistoryWidget::showHistory(
 	}
 	update();
 	controller()->floatPlayerAreaUpdated();
+	session().data().itemVisibilitiesUpdated();
 
 	crl::on_main(this, [=] { controller()->widget()->setInnerFocus(); });
 }
@@ -3332,6 +3336,7 @@ void HistoryWidget::visibleAreaUpdated() {
 		const auto scrollBottom = scrollTop + _scroll->height();
 		_list->visibleAreaUpdated(scrollTop, scrollBottom);
 		controller()->floatPlayerAreaUpdated();
+		session().data().itemVisibilitiesUpdated();
 	}
 }
 

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -331,7 +331,9 @@ ListWidget::ListWidget(
 		itemRemoved(item);
 	}, lifetime());
 
-	subscribe(session().data().queryItemVisibility(), [this](const Data::Session::ItemVisibilityQuery &query) {
+	session().data().itemVisibilityQueries(
+	) | rpl::start_with_next([=](
+			const Data::Session::ItemVisibilityQuery &query) {
 		if (const auto view = viewForItem(query.item)) {
 			const auto top = itemTop(view);
 			if (top >= 0
@@ -340,7 +342,7 @@ ListWidget::ListWidget(
 				*query.isVisible = true;
 			}
 		}
-	});
+	}, lifetime());
 
 	using ChosenReaction = Reactions::Manager::Chosen;
 	_reactionsManager->chosen(
@@ -794,6 +796,7 @@ void ListWidget::visibleTopBottomUpdated(
 		scrollDateHideByTimer();
 	}
 	_controller->floatPlayerAreaUpdated();
+	session().data().itemVisibilitiesUpdated();
 	_applyUpdatedScrollState.call();
 }
 

Telegram/SourceFiles/info/media/info_media_list_widget.cpp

@@ -169,6 +169,23 @@ void ListWidget::start() {
 		) | rpl::start_with_next([this] {
 			restart();
 		}, lifetime());
+
+		if (_provider->type() == Type::File) {
+			// For downloads manager.
+			session().data().itemVisibilityQueries(
+			) | rpl::filter([=](
+					const Data::Session::ItemVisibilityQuery &query) {
+				return _provider->isPossiblyMyItem(query.item)
+					&& isVisible();
+			}) | rpl::start_with_next([=](
+					const Data::Session::ItemVisibilityQuery &query) {
+				if (const auto found = findItemByItem(query.item)) {
+					if (itemVisible(found->layout)) {
+						*query.isVisible = true;
+					}
+				}
+			}, lifetime());
+		}
 	}
 
 	setupSelectRestriction();
@@ -566,6 +583,8 @@ void ListWidget::visibleTopBottomUpdated(
 			_dateBadge->check.call();
 		}
 	}
+
+	session().data().itemVisibilitiesUpdated();
 }
 
 void ListWidget::updateDateBadgeFor(int top) {

Telegram/SourceFiles/mainwidget.cpp

@@ -479,9 +479,7 @@ void MainWidget::floatPlayerEnumerateSections(Fn<void(
 }
 
 bool MainWidget::floatPlayerIsVisible(not_null<HistoryItem*> item) {
-	auto isVisible = false;
-	session().data().queryItemVisibility().notify({ item, &isVisible }, true);
-	return isVisible;
+	return session().data().queryItemVisibility(item);
 }
 
 void MainWidget::floatPlayerClosed(FullMsgId itemId) {