Implement correct jump to message / unread / bottom.

Telegram/SourceFiles/data/data_forum_topic.cpp

@@ -540,7 +540,7 @@ bool ForumTopic::chatListUnreadMark() const {
 }
 
 bool ForumTopic::chatListMutedBadge() const {
-	return true;
+	return history()->mute();
 }
 
 HistoryItem *ForumTopic::chatListMessage() const {

Telegram/SourceFiles/history/history_widget.cpp

@@ -5233,9 +5233,6 @@ void HistoryWidget::itemRemoved(not_null<const HistoryItem*> item) {
 	if (item == _replyEditMsg && _replyToId) {
 		cancelReply();
 	}
-	while (item == _cornerButtons.replyReturn()) {
-		_cornerButtons.calculateNextReplyReturn();
-	}
 	if (_kbReplyTo && item == _kbReplyTo) {
 		toggleKeyboard();
 		_kbReplyTo = nullptr;
@@ -5806,6 +5803,10 @@ bool HistoryWidget::cornerButtonsUnreadMayBeShown() {
 	return !_firstLoadRequest && !_voiceRecordBar->isLockPresent();
 }
 
+bool HistoryWidget::cornerButtonsHas(HistoryView::CornerButtonType type) {
+	return true;
+}
+
 void HistoryWidget::mousePressEvent(QMouseEvent *e) {
 	const auto hasSecondLayer = (_editMsgId
 		|| _replyToId

Telegram/SourceFiles/history/history_widget.h

@@ -330,6 +330,7 @@ private:
 	bool cornerButtonsIgnoreVisibility() override;
 	std::optional<bool> cornerButtonsDownShown() override;
 	bool cornerButtonsUnreadMayBeShown() override;
+	bool cornerButtonsHas(HistoryView::CornerButtonType type) override;
 
 	void checkSuggestToGigagroup();
 

Telegram/SourceFiles/history/view/history_view_corner_buttons.cpp

@@ -23,6 +23,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_messages.h"
 #include "data/data_session.h"
 #include "data/data_forum_topic.h"
+#include "lang/lang_keys.h"
+#include "ui/toast/toast.h"
 #include "styles/style_chat.h"
 
 namespace HistoryView {
@@ -31,41 +33,41 @@ CornerButtons::CornerButtons(
 	not_null<Ui::ScrollArea*> parent,
 	not_null<const Ui::ChatStyle*> st,
 	not_null<CornerButtonsDelegate*> delegate)
-: down(
+: _scroll(parent)
+, _delegate(delegate)
+, _down(
 	parent,
 	st->value(parent->lifetime(), st::historyToDown))
-, mentions(
+, _mentions(
 	parent,
 	st->value(parent->lifetime(), st::historyUnreadMentions))
-, reactions(
-	parent,
-	st->value(parent->lifetime(), st::historyUnreadReactions))
-, _scroll(parent)
-, _delegate(delegate) {
-	down.widget->addClickHandler([=] { downClick(); });
-	mentions.widget->addClickHandler([=] { mentionsClick(); });
-	reactions.widget->addClickHandler([=] { reactionsClick(); });
+, _reactions(
+		parent,
+		st->value(parent->lifetime(), st::historyUnreadReactions)) {
+	_down.widget->addClickHandler([=] { downClick(); });
+	_mentions.widget->addClickHandler([=] { mentionsClick(); });
+	_reactions.widget->addClickHandler([=] { reactionsClick(); });
 
 	const auto filterScroll = [&](CornerButton &button) {
 		button.widget->installEventFilter(this);
 	};
-	filterScroll(down);
-	filterScroll(mentions);
-	filterScroll(reactions);
+	filterScroll(_down);
+	filterScroll(_mentions);
+	filterScroll(_reactions);
 
-	SendMenu::SetupUnreadMentionsMenu(mentions.widget.data(), [=] {
+	SendMenu::SetupUnreadMentionsMenu(_mentions.widget.data(), [=] {
 		return _delegate->cornerButtonsEntry();
 	});
-	SendMenu::SetupUnreadReactionsMenu(reactions.widget.data(), [=] {
+	SendMenu::SetupUnreadReactionsMenu(_reactions.widget.data(), [=] {
 		return _delegate->cornerButtonsEntry();
 	});
 }
 
 bool CornerButtons::eventFilter(QObject *o, QEvent *e) {
 	if (e->type() == QEvent::Wheel
-		&& (o == down.widget
-			|| o == mentions.widget
-			|| o == reactions.widget)) {
+		&& (o == _down.widget
+			|| o == _mentions.widget
+			|| o == _reactions.widget)) {
 		return _scroll->viewportEvent(e);
 	}
 	return QObject::eventFilter(o, e);
@@ -164,13 +166,23 @@ void CornerButtons::calculateNextReplyReturn() {
 void CornerButtons::pushReplyReturn(not_null<HistoryItem*> item) {
 	_replyReturns.push_back(item->fullId());
 	_replyReturn = item;
+
+	if (!_replyReturnStarted) {
+		_replyReturnStarted = true;
+		item->history()->owner().itemRemoved(
+		) | rpl::start_with_next([=](not_null<const HistoryItem*> item) {
+			while (item == _replyReturn) {
+				calculateNextReplyReturn();
+			}
+		}, _down.widget->lifetime());
+	}
 }
 
-CornerButton &CornerButtons::buttonByType(CornerButtonType type) {
+CornerButton &CornerButtons::buttonByType(Type type) {
 	switch (type) {
-	case CornerButtonType::Down: return down;
-	case CornerButtonType::Mentions: return mentions;
-	case CornerButtonType::Reactions: return reactions;
+	case Type::Down: return _down;
+	case Type::Mentions: return _mentions;
+	case Type::Reactions: return _reactions;
 	}
 	Unexpected("Type in CornerButtons::buttonByType.");
 }
@@ -215,47 +227,49 @@ void CornerButtons::updateUnreadThingsVisibility() {
 	}
 	const auto entry = _delegate->cornerButtonsEntry();
 	if (!entry) {
-		updateVisibility(CornerButtonType::Mentions, false);
-		updateVisibility(CornerButtonType::Reactions, false);
+		updateVisibility(Type::Mentions, false);
+		updateVisibility(Type::Reactions, false);
 		return;
 	}
 	auto &unreadThings = entry->session().api().unreadThings();
 	unreadThings.preloadEnough(entry);
 
-	const auto updateWithCount = [&](CornerButtonType type, int count) {
+	const auto updateWithCount = [&](Type type, int count) {
 		updateVisibility(
 			type,
 			(count > 0) && _delegate->cornerButtonsUnreadMayBeShown());
 	};
-	if (unreadThings.trackMentions(entry)) {
+	if (_delegate->cornerButtonsHas(Type::Mentions)
+		&& unreadThings.trackMentions(entry)) {
 		if (const auto count = entry->unreadMentions().count(0)) {
-			mentions.widget->setUnreadCount(count);
+			_mentions.widget->setUnreadCount(count);
 		}
 		updateWithCount(
-			CornerButtonType::Mentions,
+			Type::Mentions,
 			entry->unreadMentions().loadedCount());
 	} else {
-		updateVisibility(CornerButtonType::Mentions, false);
+		updateVisibility(Type::Mentions, false);
 	}
 
-	if (unreadThings.trackReactions(entry)) {
+	if (_delegate->cornerButtonsHas(Type::Reactions)
+		&& unreadThings.trackReactions(entry)) {
 		if (const auto count = entry->unreadReactions().count(0)) {
-			reactions.widget->setUnreadCount(count);
+			_reactions.widget->setUnreadCount(count);
 		}
 		updateWithCount(
-			CornerButtonType::Reactions,
+			Type::Reactions,
 			entry->unreadReactions().loadedCount());
 	} else {
-		updateVisibility(CornerButtonType::Reactions, false);
+		updateVisibility(Type::Reactions, false);
 	}
 }
 
 void CornerButtons::updateJumpDownVisibility(std::optional<int> counter) {
 	if (const auto shown = _delegate->cornerButtonsDownShown()) {
-		updateVisibility(CornerButtonType::Down, *shown);
+		updateVisibility(Type::Down, *shown);
 	}
 	if (counter) {
-		down.widget->setUnreadCount(*counter);
+		_down.widget->setUnreadCount(*counter);
 	}
 }
 
@@ -273,64 +287,84 @@ void CornerButtons::updatePositions() {
 
 	// All corner buttons is a child widgets of _scroll, not me.
 
-	const auto historyDownShown = shown(down);
-	const auto unreadMentionsShown = shown(mentions);
-	const auto unreadReactionsShown = shown(reactions);
+	const auto historyDownShown = shown(_down);
+	const auto unreadMentionsShown = shown(_mentions);
+	const auto unreadReactionsShown = shown(_reactions);
 	const auto skip = st::historyUnreadThingsSkip;
 	{
 		const auto top = anim::interpolate(
 			0,
-			down.widget->height() + st::historyToDownPosition.y(),
+			_down.widget->height() + st::historyToDownPosition.y(),
 			historyDownShown);
-		down.widget->moveToRight(
+		_down.widget->moveToRight(
 			st::historyToDownPosition.x(),
 			_scroll->height() - top);
 	}
 	{
 		const auto right = anim::interpolate(
-			-mentions.widget->width(),
+			-_mentions.widget->width(),
 			st::historyToDownPosition.x(),
 			unreadMentionsShown);
 		const auto shift = anim::interpolate(
 			0,
-			down.widget->height() + skip,
+			_down.widget->height() + skip,
 			historyDownShown);
 		const auto top = _scroll->height()
-			- mentions.widget->height()
+			- _mentions.widget->height()
 			- st::historyToDownPosition.y()
 			- shift;
-		mentions.widget->moveToRight(right, top);
+		_mentions.widget->moveToRight(right, top);
 	}
 	{
 		const auto right = anim::interpolate(
-			-reactions.widget->width(),
+			-_reactions.widget->width(),
 			st::historyToDownPosition.x(),
 			unreadReactionsShown);
 		const auto shift = anim::interpolate(
 			0,
-			down.widget->height() + skip,
+			_down.widget->height() + skip,
 			historyDownShown
 		) + anim::interpolate(
 			0,
-			mentions.widget->height() + skip,
+			_mentions.widget->height() + skip,
 			unreadMentionsShown);
 		const auto top = _scroll->height()
-			- reactions.widget->height()
+			- _reactions.widget->height()
 			- st::historyToDownPosition.y()
 			- shift;
-		reactions.widget->moveToRight(right, top);
+		_reactions.widget->moveToRight(right, top);
 	}
 
-	checkVisibility(down);
-	checkVisibility(mentions);
-	checkVisibility(reactions);
+	checkVisibility(_down);
+	checkVisibility(_mentions);
+	checkVisibility(_reactions);
 }
 
 void CornerButtons::finishAnimations() {
-	down.animation.stop();
-	mentions.animation.stop();
-	reactions.animation.stop();
+	_down.animation.stop();
+	_mentions.animation.stop();
+	_reactions.animation.stop();
 	updatePositions();
 }
 
+Fn<void(bool found)> CornerButtons::doneJumpFrom(
+		FullMsgId targetId,
+		FullMsgId originId) {
+	return [=](bool found) {
+		skipReplyReturn(targetId);
+		if (originId) {
+			if (const auto entry = _delegate->cornerButtonsEntry()) {
+				if (const auto item = entry->owner().message(originId)) {
+					pushReplyReturn(item);
+				}
+			}
+		}
+		if (!found) {
+			Ui::Toast::Show(
+				_scroll.get(),
+				tr::lng_message_not_found(tr::now));
+		}
+	};
+}
+
 } // namespace HistoryView

Telegram/SourceFiles/history/view/history_view_corner_buttons.h

@@ -55,6 +55,7 @@ public:
 	[[nodiscard]] virtual bool cornerButtonsIgnoreVisibility() = 0;
 	[[nodiscard]] virtual std::optional<bool> cornerButtonsDownShown() = 0;
 	[[nodiscard]] virtual bool cornerButtonsUnreadMayBeShown() = 0;
+	[[nodiscard]] virtual bool cornerButtonsHas(CornerButtonType type) = 0;
 };
 
 class CornerButtons final : private QObject {
@@ -64,6 +65,8 @@ public:
 		not_null<const Ui::ChatStyle*> st,
 		not_null<CornerButtonsDelegate*> delegate);
 
+	using Type = CornerButtonType;
+
 	void downClick();
 	void mentionsClick();
 	void reactionsClick();
@@ -75,7 +78,7 @@ public:
 	void skipReplyReturn(FullMsgId id);
 	void calculateNextReplyReturn();
 
-	void updateVisibility(CornerButtonType type, bool shown);
+	void updateVisibility(Type type, bool shown);
 	void updateUnreadThingsVisibility();
 	void updateJumpDownVisibility(std::optional<int> counter = {});
 	void updatePositions();
@@ -85,26 +88,31 @@ public:
 	[[nodiscard]] HistoryItem *replyReturn() const {
 		return _replyReturn;
 	}
-
-	CornerButton down;
-	CornerButton mentions;
-	CornerButton reactions;
+	[[nodiscard]] Fn<void(bool found)> doneJumpFrom(
+		FullMsgId targetId,
+		FullMsgId originId);
 
 private:
 	bool eventFilter(QObject *o, QEvent *e) override;
 
 	void computeCurrentReplyReturn();
 
-	[[nodiscard]] CornerButton &buttonByType(CornerButtonType type);
+	[[nodiscard]] CornerButton &buttonByType(Type type);
 	[[nodiscard]] History *lookupHistory() const;
 	void showAt(MsgId id);
 
 	const not_null<Ui::ScrollArea*> _scroll;
 	const not_null<CornerButtonsDelegate*> _delegate;
 
+	CornerButton _down;
+	CornerButton _mentions;
+	CornerButton _reactions;
+
 	HistoryItem *_replyReturn = nullptr;
 	QVector<FullMsgId> _replyReturns;
 
+	bool _replyReturnStarted = false;
+
 };
 
 } // namespace HistoryView

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -482,9 +482,18 @@ void ListWidget::refreshRows(const Data::MessagesSlice &old) {
 
 std::optional<int> ListWidget::scrollTopForPosition(
 		Data::MessagePosition position) const {
-	if (position == Data::MaxMessagePosition) {
+	if (position == Data::UnreadMessagePosition) {
+		if (_bar.element && !_bar.hidden && _bar.focus) {
+			const auto shift = st::lineWidth + st::historyUnreadBarMargin;
+			return itemTop(_bar.element) + shift;
+		}
+		position = Data::MaxMessagePosition;
+	}
+	if (_visibleTop >= _visibleBottom) {
+		return std::nullopt;
+	} else if (position == Data::MaxMessagePosition) {
 		if (loadedAtBottom()) {
-			return height();
+			return height() - (_visibleBottom - _visibleTop);
 		}
 		return std::nullopt;
 	} else if (_items.empty()
@@ -609,6 +618,101 @@ void ListWidget::showAroundPosition(
 	refreshViewer();
 }
 
+bool ListWidget::jumpToBottomInsteadOfUnread() const {
+	// If we want to jump to unread, but we're at the unread already,
+	// then jump to the end of the list.
+	//
+	// That means there is no read inbox messages below us.
+	const auto firstReadMessage = [&]() -> Element* {
+		for (const auto &view : ranges::views::reverse(_items)) {
+			const auto item = view->data();
+			if (item->isRegular()
+				&& (item->out()
+					|| !_delegate->listElementShownUnread(view))) {
+				return view;
+			}
+		}
+		return nullptr;
+	}();
+	return !firstReadMessage || (itemTop(firstReadMessage) < _visibleBottom);
+}
+
+void ListWidget::showAtPosition(
+		Data::MessagePosition position,
+		anim::type animated,
+		Fn<void(bool found)> done) {
+	const auto showAtUnread = (position == Data::UnreadMessagePosition);
+	const auto showAtStart = (position == Data::MinMessagePosition);
+	const auto showAtEnd = (position == Data::MaxMessagePosition);
+
+	if (showAtUnread && jumpToBottomInsteadOfUnread()) {
+		showAtPosition(Data::MaxMessagePosition, animated, std::move(done));
+		return;
+	}
+
+	if (position.fullId.peer && position.fullId.msg) {
+		if (const auto item = session().data().message(position.fullId)) {
+			position = item->position();
+		}
+	}
+
+	if (showAtUnread) {
+		showAroundPosition(position, [=] {
+			if (_bar.element) {
+				_bar.element->destroyUnreadBar();
+				const auto i = ranges::find(_items, not_null{ _bar.element });
+				Assert(i != end(_items));
+				refreshAttachmentsAtIndex(i - begin(_items));
+				_bar = {};
+			}
+			checkUnreadBarCreation();
+			return showAtPositionNow(position, animated, done);
+		});
+	} else if (!showAtPositionNow(position, animated, done)) {
+		showAroundPosition(position, [=] {
+			return showAtPositionNow(position, animated, done);
+		});
+	}
+}
+
+bool ListWidget::showAtPositionNow(
+		Data::MessagePosition position,
+		anim::type animated,
+		Fn<void(bool found)> done) {
+	if (const auto scrollTop = scrollTopForPosition(position)) {
+		computeScrollTo(*scrollTop, position, animated);
+		if (position != Data::MaxMessagePosition
+			&& position != Data::UnreadMessagePosition) {
+			highlightMessage(position.fullId);
+		}
+		done(!position.fullId.peer
+			|| !position.fullId.msg
+			|| viewForItem(position.fullId));
+		return true;
+	}
+	return false;
+}
+
+void ListWidget::computeScrollTo(
+		int to,
+		Data::MessagePosition position,
+		anim::type animated) {
+	const auto currentScrollHeight = (_visibleBottom - _visibleTop);
+	const auto currentScrollTop = _visibleTop;
+	const auto wanted = std::max(
+		std::min(to, height() - currentScrollHeight),
+		0);
+	const auto fullDelta = (wanted - currentScrollTop);
+	const auto limit = currentScrollHeight;
+	const auto scrollDelta = std::clamp(fullDelta, -limit, limit);
+	const auto type = (animated == anim::type::instant)
+		? AnimatedScroll::None
+		: (std::abs(fullDelta) > limit)
+		? AnimatedScroll::Part
+		: AnimatedScroll::Full;
+	scrollTo(wanted, position, scrollDelta, type);
+}
+
 void ListWidget::checkUnreadBarCreation() {
 	if (!_bar.element) {
 		if (auto data = _delegate->listMessagesBar(_items); data.bar.element) {
@@ -1672,7 +1776,7 @@ int ListWidget::resizeGetHeight(int newWidth) {
 
 	const auto resizeAllItems = (_itemsWidth != newWidth);
 	auto newHeight = 0;
-	for (auto &view : _items) {
+	for (const auto &view : _items) {
 		view->setY(newHeight);
 		if (view->pendingResize() || resizeAllItems) {
 			newHeight += view->resizeGetHeight(newWidth);

Telegram/SourceFiles/history/view/history_view_list_widget.h

@@ -202,23 +202,16 @@ public:
 		Data::MessagePosition position) const;
 	Element *viewByPosition(Data::MessagePosition position) const;
 	std::optional<int> scrollTopForView(not_null<Element*> view) const;
-	enum class AnimatedScroll {
-		Full,
-		Part,
-		None,
-	};
-	void scrollTo(
-		int scrollTop,
-		Data::MessagePosition attachPosition,
-		int delta,
-		AnimatedScroll type);
 	[[nodiscard]] bool animatedScrolling() const;
 	bool isAbovePosition(Data::MessagePosition position) const;
 	bool isBelowPosition(Data::MessagePosition position) const;
 	void highlightMessage(FullMsgId itemId);
-	void showAroundPosition(
+
+	void showAtPosition(
 		Data::MessagePosition position,
-		Fn<bool()> overrideInitialScroll);
+		anim::type animated = anim::type::normal,
+		Fn<void(bool found)> done = nullptr);
+	void refreshViewer();
 
 	[[nodiscard]] TextForMimeData getSelectedText() const;
 	[[nodiscard]] MessageIdsList getSelectedIds() const;
@@ -391,13 +384,21 @@ private:
 	void onTouchSelect();
 	void onTouchScrollTimer();
 
-	void refreshViewer();
 	void updateAroundPositionFromNearest(int nearestIndex);
 	void refreshRows(const Data::MessagesSlice &old);
 	ScrollTopState countScrollState() const;
 	void saveScrollState();
 	void restoreScrollState();
 
+	[[nodiscard]] bool jumpToBottomInsteadOfUnread() const;
+	void showAroundPosition(
+		Data::MessagePosition position,
+		Fn<bool()> overrideInitialScroll);
+	bool showAtPositionNow(
+		Data::MessagePosition position,
+		anim::type animated,
+		Fn<void(bool found)> done);
+
 	Ui::ChatPaintContext preparePaintContext(const QRect &clip) const;
 
 	Element *viewForItem(FullMsgId itemId) const;
@@ -453,6 +454,21 @@ private:
 	void scrollDateHideByTimer();
 	void keepScrollDateForNow();
 
+	void computeScrollTo(
+		int to,
+		Data::MessagePosition position,
+		anim::type animated);
+	enum class AnimatedScroll {
+		Full,
+		Part,
+		None,
+	};
+	void scrollTo(
+		int scrollTop,
+		Data::MessagePosition attachPosition,
+		int delta,
+		AnimatedScroll type);
+
 	void trySwitchToWordSelection();
 	void switchToWordSelection();
 	void validateTrippleClickStartTime();

Telegram/SourceFiles/history/view/history_view_pinned_section.cpp

@@ -102,9 +102,10 @@ PinnedWidget::PinnedWidget(
 	this,
 	QString(),
 	st::historyComposeButton))
-, _scrollDown(
+, _cornerButtons(
 		_scroll.get(),
-		controller->chatStyle()->value(lifetime(), st::historyToDown)) {
+		controller->chatStyle(),
+		static_cast<HistoryView::CornerButtonsDelegate*>(this)) {
 	controller->chatStyle()->paletteChanged(
 	) | rpl::start_with_next([=] {
 		_scroll->updateBars();
@@ -161,26 +162,10 @@ PinnedWidget::PinnedWidget(
 	}, lifetime());
 
 	setupClearButton();
-	setupScrollDownButton();
 }
 
 PinnedWidget::~PinnedWidget() = default;
 
-void PinnedWidget::setupScrollDownButton() {
-	_scrollDown->setClickedCallback([=] {
-		scrollDownClicked();
-	});
-	base::install_event_filter(_scrollDown, [=](not_null<QEvent*> event) {
-		if (event->type() != QEvent::Wheel) {
-			return base::EventFilterResult::Continue;
-		}
-		return _scroll->viewportEvent(event)
-			? base::EventFilterResult::Cancel
-			: base::EventFilterResult::Continue;
-	});
-	updateScrollDownVisibility();
-}
-
 void PinnedWidget::setupClearButton() {
 	Data::CanPinMessagesValue(
 		_history->peer
@@ -203,118 +188,48 @@ void PinnedWidget::setupClearButton() {
 	});
 }
 
-void PinnedWidget::scrollDownClicked() {
-	if (base::IsCtrlPressed()) {
-		showAtEnd();
-	//} else if (_replyReturn) {
-	//	showAtPosition(_replyReturn->position());
-	} else {
-		showAtEnd();
+void PinnedWidget::cornerButtonsShowAtPosition(
+		Data::MessagePosition position) {
+	showAtPosition(position);
+}
+
+Dialogs::Entry *PinnedWidget::cornerButtonsEntry() {
+	return _history;
+}
+
+FullMsgId PinnedWidget::cornerButtonsCurrentId() {
+	return {};
+}
+
+bool PinnedWidget::cornerButtonsIgnoreVisibility() {
+	return animatingShow();
+}
+
+std::optional<bool> PinnedWidget::cornerButtonsDownShown() {
+	const auto top = _scroll->scrollTop() + st::historyToDownShownAfter;
+	if (top < _scroll->scrollTopMax() || _cornerButtons.replyReturn()) {
+		return true;
+	} else if (_inner->loadedAtBottomKnown()) {
+		return !_inner->loadedAtBottom();
 	}
+	return std::nullopt;
 }
 
-void PinnedWidget::showAtStart() {
-	showAtPosition(Data::MinMessagePosition);
+bool PinnedWidget::cornerButtonsUnreadMayBeShown() {
+	return _inner->loadedAtBottomKnown();
 }
 
-void PinnedWidget::showAtEnd() {
-	showAtPosition(Data::MaxMessagePosition);
+bool PinnedWidget::cornerButtonsHas(CornerButtonType type) {
+	return (type == CornerButtonType::Down);
 }
 
 void PinnedWidget::showAtPosition(
 		Data::MessagePosition position,
-		HistoryItem *originItem) {
-	if (!showAtPositionNow(position, originItem)) {
-		_inner->showAroundPosition(position, [=] {
-			return showAtPositionNow(position, originItem);
-		});
-	}
-}
-
-bool PinnedWidget::showAtPositionNow(
-		Data::MessagePosition position,
-		HistoryItem *originItem,
-		anim::type animated) {
-	using AnimatedScroll = HistoryView::ListWidget::AnimatedScroll;
-
-	const auto item = position.fullId
-		? _history->owner().message(position.fullId)
-		: nullptr;
-	const auto use = item ? item->position() : position;
-	if (const auto scrollTop = _inner->scrollTopForPosition(use)) {
-		const auto currentScrollTop = _scroll->scrollTop();
-		const auto wanted = std::clamp(
-			*scrollTop,
-			0,
-			_scroll->scrollTopMax());
-		const auto fullDelta = (wanted - currentScrollTop);
-		const auto limit = _scroll->height();
-		const auto scrollDelta = std::clamp(fullDelta, -limit, limit);
-		const auto type = (animated == anim::type::instant)
-			? AnimatedScroll::None
-			: (std::abs(fullDelta) > limit)
-			? AnimatedScroll::Part
-			: AnimatedScroll::Full;
-		_inner->scrollTo(
-			wanted,
-			use,
-			scrollDelta,
-			type);
-		if (use != Data::MaxMessagePosition
-			&& use != Data::UnreadMessagePosition) {
-			_inner->highlightMessage(use.fullId);
-		}
-		return true;
-	}
-	return false;
-}
-
-void PinnedWidget::updateScrollDownVisibility() {
-	if (animatingShow()) {
-		return;
-	}
-
-	const auto scrollDownIsVisible = [&]() -> std::optional<bool> {
-		const auto top = _scroll->scrollTop() + st::historyToDownShownAfter;
-		if (top < _scroll->scrollTopMax()) {
-			return true;
-		} else if (_inner->loadedAtBottomKnown()) {
-			return !_inner->loadedAtBottom();
-		}
-		return std::nullopt;
-	};
-	const auto scrollDownIsShown = scrollDownIsVisible();
-	if (!scrollDownIsShown) {
-		return;
-	}
-	if (_scrollDownIsShown != *scrollDownIsShown) {
-		_scrollDownIsShown = *scrollDownIsShown;
-		_scrollDownShown.start(
-			[=] { updateScrollDownPosition(); },
-			_scrollDownIsShown ? 0. : 1.,
-			_scrollDownIsShown ? 1. : 0.,
-			st::historyToDownDuration);
-	}
-}
-
-void PinnedWidget::updateScrollDownPosition() {
-	// _scrollDown is a child widget of _scroll, not me.
-	auto top = anim::interpolate(
-		0,
-		_scrollDown->height() + st::historyToDownPosition.y(),
-		_scrollDownShown.value(_scrollDownIsShown ? 1. : 0.));
-	_scrollDown->moveToRight(
-		st::historyToDownPosition.x(),
-		_scroll->height() - top);
-	auto shouldBeHidden = !_scrollDownIsShown && !_scrollDownShown.animating();
-	if (shouldBeHidden != _scrollDown->isHidden()) {
-		_scrollDown->setVisible(!shouldBeHidden);
-	}
-}
-
-void PinnedWidget::scrollDownAnimationFinish() {
-	_scrollDownShown.stop();
-	updateScrollDownPosition();
+		FullMsgId originId) {
+	_inner->showAtPosition(
+		position,
+		anim::type::normal,
+		_cornerButtons.doneJumpFrom(position.fullId, originId));
 }
 
 void PinnedWidget::updateAdaptiveLayout() {
@@ -387,15 +302,12 @@ void PinnedWidget::saveState(not_null<PinnedMemento*> memento) {
 void PinnedWidget::restoreState(not_null<PinnedMemento*> memento) {
 	_inner->restoreState(memento->list());
 	if (const auto highlight = memento->getHighlightId()) {
-		const auto position = Data::MessagePosition{
+		_inner->showAtPosition(Data::MessagePosition{
 			.fullId = ((highlight > 0 || !_migratedPeer)
 				? FullMsgId(_history->peer->id, highlight)
 				: FullMsgId(_migratedPeer->id, -highlight)),
 			.date = TimeId(0),
-		};
-		_inner->showAroundPosition(position, [=] {
-			return showAtPositionNow(position, nullptr, anim::type::instant);
-		});
+		}, anim::type::instant);
 	}
 }
 
@@ -463,7 +375,8 @@ void PinnedWidget::updateControlsGeometry() {
 		}
 		updateInnerVisibleArea();
 	}
-	updateScrollDownPosition();
+
+	_cornerButtons.updatePositions();
 }
 
 void PinnedWidget::paintEvent(QPaintEvent *e) {
@@ -490,7 +403,8 @@ void PinnedWidget::onScroll() {
 void PinnedWidget::updateInnerVisibleArea() {
 	const auto scrollTop = _scroll->scrollTop();
 	_inner->setVisibleTopBottom(scrollTop, scrollTop + _scroll->height());
-	updateScrollDownVisibility();
+	_cornerButtons.updateJumpDownVisibility();
+	_cornerButtons.updateUnreadThingsVisibility();
 }
 
 void PinnedWidget::showAnimatedHook(

Telegram/SourceFiles/history/view/history_view_pinned_section.h

@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/section_widget.h"
 #include "window/section_memento.h"
 #include "history/view/history_view_list_widget.h"
+#include "history/view/history_view_corner_buttons.h"
 #include "data/data_messages.h"
 #include "base/weak_ptr.h"
 #include "base/timer.h"
@@ -35,7 +36,8 @@ class PinnedMemento;
 
 class PinnedWidget final
 	: public Window::SectionWidget
-	, private ListDelegate {
+	, private ListDelegate
+	, private CornerButtonsDelegate {
 public:
 	PinnedWidget(
 		QWidget *parent,
@@ -111,6 +113,16 @@ public:
 		-> rpl::producer<Data::AllowedReactions> override;
 	void listShowPremiumToast(not_null<DocumentData*> document) override;
 
+	// CornerButtonsDelegate delegate.
+	void cornerButtonsShowAtPosition(
+		Data::MessagePosition position) override;
+	Dialogs::Entry *cornerButtonsEntry() override;
+	FullMsgId cornerButtonsCurrentId() override;
+	bool cornerButtonsIgnoreVisibility() override;
+	std::optional<bool> cornerButtonsDownShown() override;
+	bool cornerButtonsUnreadMayBeShown() override;
+	bool cornerButtonsHas(CornerButtonType type) override;
+
 protected:
 	void resizeEvent(QResizeEvent *e) override;
 	void paintEvent(QPaintEvent *e) override;
@@ -127,22 +139,11 @@ private:
 	void updateAdaptiveLayout();
 	void saveState(not_null<PinnedMemento*> memento);
 	void restoreState(not_null<PinnedMemento*> memento);
-	void showAtStart();
-	void showAtEnd();
 	void showAtPosition(
 		Data::MessagePosition position,
-		HistoryItem *originItem = nullptr);
-	bool showAtPositionNow(
-		Data::MessagePosition position,
-		HistoryItem *originItem,
-		anim::type animated = anim::type::normal);
+		FullMsgId originId = {});
 
 	void setupClearButton();
-	void setupScrollDownButton();
-	void scrollDownClicked();
-	void scrollDownAnimationFinish();
-	void updateScrollDownVisibility();
-	void updateScrollDownPosition();
 
 	void confirmDeleteSelected();
 	void confirmForwardSelected();
@@ -163,9 +164,7 @@ private:
 	std::unique_ptr<Ui::ScrollArea> _scroll;
 	std::unique_ptr<Ui::FlatButton> _clearButton;
 
-	Ui::Animations::Simple _scrollDownShown;
-	bool _scrollDownIsShown = false;
-	object_ptr<Ui::HistoryDownButton> _scrollDown;
+	CornerButtons _cornerButtons;
 
 	int _messagesCount = -1;
 

Telegram/SourceFiles/history/view/history_view_replies_section.cpp

@@ -337,9 +337,6 @@ RepliesWidget::RepliesWidget(
 				controller->showBackFromStack();
 			}
 		}
-		while (update.item == _cornerButtons.replyReturn()) {
-			_cornerButtons.calculateNextReplyReturn();
-		}
 	}, lifetime());
 
 	_history->session().changes().historyUpdates(
@@ -477,6 +474,8 @@ void RepliesWidget::setupTopicViewer() {
 }
 
 void RepliesWidget::subscribeToTopic() {
+	Expects(_topic != nullptr);
+
 	using TopicUpdateFlag = Data::TopicUpdate::Flag;
 	session().changes().topicUpdates(
 		_topic,
@@ -485,6 +484,8 @@ void RepliesWidget::subscribeToTopic() {
 	) | rpl::start_with_next([=](const Data::TopicUpdate &update) {
 		_cornerButtons.updateUnreadThingsVisibility();
 	}, _topicLifetime);
+
+	_cornerButtons.updateUnreadThingsVisibility();
 }
 
 void RepliesWidget::setTopic(Data::ForumTopic *topic) {
@@ -917,7 +918,7 @@ bool RepliesWidget::showSlowmodeError() {
 				Ui::FormatDurationWordsSlowmode(left));
 		} else if (_history->peer->slowmodeApplied()) {
 			if (const auto item = _history->latestSendingMessage()) {
-				showAtPositionNow(item->position(), nullptr);
+				showAtPosition(item->position());
 				return tr::lng_slowmode_no_many(tr::now);
 			}
 		}
@@ -1379,7 +1380,7 @@ void RepliesWidget::cornerButtonsShowAtPosition(
 }
 
 Dialogs::Entry *RepliesWidget::cornerButtonsEntry() {
-	return _topic;
+	return _topic ? static_cast<Dialogs::Entry*>(_topic) : _history;
 }
 
 FullMsgId RepliesWidget::cornerButtonsCurrentId() {
@@ -1408,6 +1409,10 @@ bool RepliesWidget::cornerButtonsUnreadMayBeShown() {
 		&& !_composeControls->isLockPresent();
 }
 
+bool RepliesWidget::cornerButtonsHas(CornerButtonType type) {
+	return _topic || (type == CornerButtonType::Down);
+}
+
 void RepliesWidget::showAtStart() {
 	showAtPosition(Data::MinMessagePosition);
 }
@@ -1426,50 +1431,12 @@ void RepliesWidget::finishSending() {
 
 void RepliesWidget::showAtPosition(
 		Data::MessagePosition position,
-		HistoryItem *originItem) {
-	if (!showAtPositionNow(position, originItem)) {
-		_inner->showAroundPosition(position, [=] {
-			return showAtPositionNow(position, originItem);
-		});
-	}
-}
-
-bool RepliesWidget::showAtPositionNow(
-		Data::MessagePosition position,
-		HistoryItem *originItem,
-		anim::type animated) {
-	using AnimatedScroll = HistoryView::ListWidget::AnimatedScroll;
-	const auto item = position.fullId
-		? _history->owner().message(position.fullId)
-		: nullptr;
-	const auto use = item ? item->position() : position;
-	if (const auto scrollTop = _inner->scrollTopForPosition(use)) {
-		_cornerButtons.skipReplyReturn(use.fullId);
-		const auto currentScrollTop = _scroll->scrollTop();
-		const auto wanted = std::clamp(
-			*scrollTop,
-			0,
-			_scroll->scrollTopMax());
-		const auto fullDelta = (wanted - currentScrollTop);
-		const auto limit = _scroll->height();
-		const auto scrollDelta = std::clamp(fullDelta, -limit, limit);
-		const auto type = (animated == anim::type::instant)
-			? AnimatedScroll::None
-			: (std::abs(fullDelta) > limit)
-			? AnimatedScroll::Part
-			: AnimatedScroll::Full;
-		_inner->scrollTo(wanted, use, scrollDelta, type);
-		_lastShownAt = use.fullId;
-		if (use != Data::MaxMessagePosition
-			&& use != Data::UnreadMessagePosition) {
-			_inner->highlightMessage(use.fullId);
-		}
-		if (originItem) {
-			pushReplyReturn(originItem);
-		}
-		return true;
-	}
-	return false;
+		FullMsgId originItemId) {
+	_lastShownAt = position.fullId;
+	_inner->showAtPosition(
+		position,
+		anim::type::normal,
+		_cornerButtons.doneJumpFrom(position.fullId, originItemId));
 }
 
 void RepliesWidget::updateAdaptiveLayout() {
@@ -1619,11 +1586,10 @@ bool RepliesWidget::showMessage(
 	if (!originMessage) {
 		return false;
 	}
-	const auto originItem = (!originMessage
-		|| _cornerButtons.replyReturn() == originMessage)
-		? nullptr
-		: originMessage;
-	showAtPosition(message->position(), originItem);
+	const auto originItemId = (_cornerButtons.replyReturn() != originMessage)
+		? originMessage->fullId()
+		: FullMsgId();
+	showAtPosition(message->position(), originItemId);
 	return true;
 }
 
@@ -1653,7 +1619,7 @@ void RepliesWidget::refreshReplies() {
 		? _topic->replies()
 		: std::make_shared<Data::RepliesList>(_history, _rootId));
 	if (old) {
-		_inner->showAroundPosition(Data::UnreadMessagePosition, nullptr);
+		_inner->refreshViewer();
 	}
 }
 
@@ -1701,13 +1667,10 @@ void RepliesWidget::restoreState(not_null<RepliesMemento*> memento) {
 	_cornerButtons.setReplyReturns(memento->replyReturns());
 	_inner->restoreState(memento->list());
 	if (const auto highlight = memento->getHighlightId()) {
-		const auto position = Data::MessagePosition{
+		_inner->showAtPosition(Data::MessagePosition{
 			.fullId = FullMsgId(_history->peer->id, highlight),
 			.date = TimeId(0),
-		};
-		_inner->showAroundPosition(position, [=] {
-			return showAtPositionNow(position, nullptr);
-		});
+		}, anim::type::instant);
 	}
 }
 

Telegram/SourceFiles/history/view/history_view_replies_section.h

@@ -159,6 +159,7 @@ public:
 	bool cornerButtonsIgnoreVisibility() override;
 	std::optional<bool> cornerButtonsDownShown() override;
 	bool cornerButtonsUnreadMayBeShown() override;
+	bool cornerButtonsHas(CornerButtonType type) override;
 
 protected:
 	void resizeEvent(QResizeEvent *e) override;
@@ -182,11 +183,7 @@ private:
 	void showAtEnd();
 	void showAtPosition(
 		Data::MessagePosition position,
-		HistoryItem *originItem = nullptr);
-	bool showAtPositionNow(
-		Data::MessagePosition position,
-		HistoryItem *originItem,
-		anim::type animated = anim::type::normal);
+		FullMsgId originItemId = {});
 	void finishSending();
 
 	void setupComposeControls();

Telegram/SourceFiles/history/view/history_view_scheduled_section.cpp

@@ -112,9 +112,10 @@ ScheduledWidget::ScheduledWidget(
 	[=](not_null<DocumentData*> emoji) { listShowPremiumToast(emoji); },
 	ComposeControls::Mode::Scheduled,
 	SendMenu::Type::Disabled))
-, _scrollDown(
-		_scroll,
-		controller->chatStyle()->value(lifetime(), st::historyToDown)) {
+, _cornerButtons(
+		_scroll.data(),
+		controller->chatStyle(),
+		static_cast<HistoryView::CornerButtonsDelegate*>(this)) {
 	controller->chatStyle()->paletteChanged(
 	) | rpl::start_with_next([=] {
 		_scroll->updateBars();
@@ -193,16 +194,6 @@ ScheduledWidget::ScheduledWidget(
 		emptyInfo->setText(emptyText);
 		_inner->setEmptyInfoWidget(std::move(emptyInfo));
 	}
-
-	_history->session().changes().messageUpdates(
-		Data::MessageUpdate::Flag::Destroyed
-	) | rpl::start_with_next([=](const Data::MessageUpdate &update) {
-		while (update.item == _replyReturn) {
-			calculateNextReplyReturn();
-		}
-	}, lifetime());
-
-	setupScrollDownButton();
 	setupComposeControls();
 }
 
@@ -307,7 +298,8 @@ void ScheduledWidget::setupComposeControls() {
 
 	_composeControls->lockShowStarts(
 	) | rpl::start_with_next([=] {
-		updateScrollDownVisibility();
+		_cornerButtons.updateJumpDownVisibility();
+		_cornerButtons.updateUnreadThingsVisibility();
 	}, lifetime());
 
 	_composeControls->viewportEvents(
@@ -488,40 +480,21 @@ bool ScheduledWidget::confirmSendingFiles(
 
 void ScheduledWidget::pushReplyReturn(not_null<HistoryItem*> item) {
 	if (_inner->viewByPosition(item->position())) {
-		_replyReturns.push_back(item->id);
-	} else {
-		return;
-	}
-	_replyReturn = item;
-	updateScrollDownVisibility();
-}
-
-void ScheduledWidget::computeCurrentReplyReturn() {
-	_replyReturn = _replyReturns.empty()
-		? nullptr
-		: _history->owner().message(_history->peer, _replyReturns.back());
-}
-
-void ScheduledWidget::calculateNextReplyReturn() {
-	_replyReturn = nullptr;
-	while (!_replyReturns.empty() && !_replyReturn) {
-		_replyReturns.pop_back();
-		computeCurrentReplyReturn();
-	}
-	if (!_replyReturn) {
-		updateScrollDownVisibility();
+		_cornerButtons.pushReplyReturn(item);
 	}
 }
 
 void ScheduledWidget::checkReplyReturns() {
 	const auto currentTop = _scroll->scrollTop();
-	for (; _replyReturn != nullptr; calculateNextReplyReturn()) {
-		const auto position = _replyReturn->position();
+	while (const auto replyReturn = _cornerButtons.replyReturn()) {
+		const auto position = replyReturn->position();
 		const auto scrollTop = _inner->scrollTopForPosition(position);
-		const auto scrolledBelow = scrollTop
+		const auto below = scrollTop
 			? (currentTop >= std::min(*scrollTop, _scroll->scrollTopMax()))
 			: _inner->isBelowPosition(position);
-		if (!scrolledBelow) {
+		if (below) {
+			_cornerButtons.calculateNextReplyReturn();
+		} else {
 			break;
 		}
 	}
@@ -844,138 +817,52 @@ SendMenu::Type ScheduledWidget::sendMenuType() const {
 		: SendMenu::Type::Scheduled;
 }
 
-void ScheduledWidget::setupScrollDownButton() {
-	_scrollDown->setClickedCallback([=] {
-		scrollDownClicked();
-	});
-	base::install_event_filter(_scrollDown, [=](not_null<QEvent*> event) {
-		if (event->type() != QEvent::Wheel) {
-			return base::EventFilterResult::Continue;
-		}
-		return _scroll->viewportEvent(event)
-			? base::EventFilterResult::Cancel
-			: base::EventFilterResult::Continue;
-	});
-	updateScrollDownVisibility();
+void ScheduledWidget::cornerButtonsShowAtPosition(
+		Data::MessagePosition position) {
+	showAtPosition(position);
 }
 
-void ScheduledWidget::scrollDownClicked() {
-	if (base::IsCtrlPressed()) {
-		showAtEnd();
-	} else if (_replyReturn) {
-		showAtPosition(_replyReturn->position());
-	} else {
-		showAtEnd();
+Dialogs::Entry *ScheduledWidget::cornerButtonsEntry() {
+	return _history;
+}
+
+FullMsgId ScheduledWidget::cornerButtonsCurrentId() {
+	return {};
+}
+
+bool ScheduledWidget::cornerButtonsIgnoreVisibility() {
+	return animatingShow();
+}
+
+std::optional<bool> ScheduledWidget::cornerButtonsDownShown() {
+	if (_composeControls->isLockPresent()) {
+		return false;
 	}
+	const auto top = _scroll->scrollTop() + st::historyToDownShownAfter;
+	if (top < _scroll->scrollTopMax() || _cornerButtons.replyReturn()) {
+		return true;
+	} else if (_inner->loadedAtBottomKnown()) {
+		return !_inner->loadedAtBottom();
+	}
+	return std::nullopt;
 }
 
-void ScheduledWidget::showAtEnd() {
-	showAtPosition(Data::MaxMessagePosition);
+bool ScheduledWidget::cornerButtonsUnreadMayBeShown() {
+	return _inner->loadedAtBottomKnown()
+		&& !_composeControls->isLockPresent();
+}
+
+bool ScheduledWidget::cornerButtonsHas(CornerButtonType type) {
+	return (type == CornerButtonType::Down);
 }
 
 void ScheduledWidget::showAtPosition(
 		Data::MessagePosition position,
-		HistoryItem *originItem) {
-	if (showAtPositionNow(position, originItem)) {
-		if (const auto highlight = base::take(_highlightMessageId)) {
-			_inner->highlightMessage(highlight);
-		}
-	} else {
-		_nextAnimatedScrollPosition = position;
-		_nextAnimatedScrollDelta = _inner->isBelowPosition(position)
-			? -_scroll->height()
-			: _inner->isAbovePosition(position)
-			? _scroll->height()
-			: 0;
-		auto memento = HistoryView::ListMemento(position);
-		_inner->restoreState(&memento);
-	}
-}
-
-bool ScheduledWidget::showAtPositionNow(
-		Data::MessagePosition position,
-		HistoryItem *originItem) {
-	if (const auto scrollTop = _inner->scrollTopForPosition(position)) {
-		while (_replyReturn && position.fullId.msg == _replyReturn->id) {
-			calculateNextReplyReturn();
-		}
-		const auto currentScrollTop = _scroll->scrollTop();
-		const auto wanted = std::clamp(
-			*scrollTop,
-			0,
-			_scroll->scrollTopMax());
-		const auto fullDelta = (wanted - currentScrollTop);
-		const auto limit = _scroll->height();
-		const auto scrollDelta = std::clamp(fullDelta, -limit, limit);
-		_inner->scrollTo(
-			wanted,
-			position,
-			scrollDelta,
-			(std::abs(fullDelta) > limit
-				? HistoryView::ListWidget::AnimatedScroll::Part
-				: HistoryView::ListWidget::AnimatedScroll::Full));
-		if (position != Data::MaxMessagePosition
-			&& position != Data::UnreadMessagePosition) {
-			_inner->highlightMessage(position.fullId);
-		}
-		if (originItem) {
-			pushReplyReturn(originItem);
-		}
-		return true;
-	}
-	return false;
-}
-
-void ScheduledWidget::updateScrollDownVisibility() {
-	if (animatingShow()) {
-		return;
-	}
-
-	const auto scrollDownIsVisible = [&]() -> std::optional<bool> {
-		if (_composeControls->isLockPresent()) {
-			return false;
-		}
-		const auto top = _scroll->scrollTop() + st::historyToDownShownAfter;
-		if (top < _scroll->scrollTopMax()) {
-			return true;
-		}
-		if (_inner->loadedAtBottomKnown()) {
-			return !_inner->loadedAtBottom();
-		}
-		return std::nullopt;
-	};
-	const auto scrollDownIsShown = scrollDownIsVisible();
-	if (!scrollDownIsShown) {
-		return;
-	}
-	if (_scrollDownIsShown != *scrollDownIsShown) {
-		_scrollDownIsShown = *scrollDownIsShown;
-		_scrollDownShown.start(
-			[=] { updateScrollDownPosition(); },
-			_scrollDownIsShown ? 0. : 1.,
-			_scrollDownIsShown ? 1. : 0.,
-			st::historyToDownDuration);
-	}
-}
-
-void ScheduledWidget::updateScrollDownPosition() {
-	// _scrollDown is a child widget of _scroll, not me.
-	auto top = anim::interpolate(
-		0,
-		_scrollDown->height() + st::historyToDownPosition.y(),
-		_scrollDownShown.value(_scrollDownIsShown ? 1. : 0.));
-	_scrollDown->moveToRight(
-		st::historyToDownPosition.x(),
-		_scroll->height() - top);
-	auto shouldBeHidden = !_scrollDownIsShown && !_scrollDownShown.animating();
-	if (shouldBeHidden != _scrollDown->isHidden()) {
-		_scrollDown->setVisible(!shouldBeHidden);
-	}
-}
-
-void ScheduledWidget::scrollDownAnimationFinish() {
-	_scrollDownShown.stop();
-	updateScrollDownPosition();
+		FullMsgId originId) {
+	_inner->showAtPosition(
+		position,
+		anim::type::normal,
+		_cornerButtons.doneJumpFrom(position.fullId, originId));
 }
 
 void ScheduledWidget::updateAdaptiveLayout() {
@@ -1092,7 +979,7 @@ void ScheduledWidget::updateControlsGeometry() {
 	_composeControls->move(0, bottom - controlsHeight);
 	_composeControls->setAutocompleteBoundingRect(_scroll->geometry());
 
-	updateScrollDownPosition();
+	_cornerButtons.updatePositions();
 }
 
 void ScheduledWidget::paintEvent(QPaintEvent *e) {
@@ -1126,7 +1013,8 @@ void ScheduledWidget::updateInnerVisibleArea() {
 	}
 	const auto scrollTop = _scroll->scrollTop();
 	_inner->setVisibleTopBottom(scrollTop, scrollTop + _scroll->height());
-	updateScrollDownVisibility();
+	_cornerButtons.updateJumpDownVisibility();
+	_cornerButtons.updateUnreadThingsVisibility();
 }
 
 void ScheduledWidget::showAnimatedHook(
@@ -1224,7 +1112,6 @@ void ScheduledWidget::highlightSingleNewMessage(
 	}
 	const auto newId = slice.ids[firstDifferent];
 	if (const auto item = session().data().message(newId)) {
-	//	_highlightMessageId = newId;
 		showAtPosition(item->position());
 	}
 }
@@ -1267,7 +1154,7 @@ void ScheduledWidget::listMarkContentsRead(
 
 MessagesBarData ScheduledWidget::listMessagesBar(
 		const std::vector<not_null<Element*>> &elements) {
-	return MessagesBarData();
+	return {};
 }
 
 void ScheduledWidget::listContentRefreshed() {
@@ -1308,14 +1195,16 @@ bool ScheduledWidget::showMessage(
 		if (const auto origin = std::get_if<OriginMessage>(&params.origin)) {
 			if (const auto returnTo = session().data().message(origin->id)) {
 				if (_inner->viewByPosition(returnTo->position())
-					&& _replyReturn != returnTo) {
+					&& _cornerButtons.replyReturn() != returnTo) {
 					return returnTo;
 				}
 			}
 		}
 		return nullptr;
 	}();
-	showAtPosition(message->position(), originItem);
+	showAtPosition(
+		message->position(),
+		originItem ? originItem->fullId() : FullMsgId());
 	return true;
 }
 

Telegram/SourceFiles/history/view/history_view_scheduled_section.h

@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/section_widget.h"
 #include "window/section_memento.h"
 #include "history/view/history_view_list_widget.h"
+#include "history/view/history_view_corner_buttons.h"
 #include "data/data_messages.h"
 
 class History;
@@ -52,7 +53,8 @@ class StickerToast;
 
 class ScheduledWidget final
 	: public Window::SectionWidget
-	, private ListDelegate {
+	, private ListDelegate
+	, private CornerButtonsDelegate {
 public:
 	ScheduledWidget(
 		QWidget *parent,
@@ -121,7 +123,8 @@ public:
 	ClickHandlerPtr listDateLink(not_null<Element*> view) override;
 	bool listElementHideReply(not_null<const Element*> view) override;
 	bool listElementShownUnread(not_null<const Element*> view) override;
-	bool listIsGoodForAroundPosition(not_null<const Element *> view) override;
+	bool listIsGoodForAroundPosition(
+		not_null<const Element *> view) override;
 	void listSendBotCommand(
 		const QString &command,
 		const FullMsgId &context) override;
@@ -133,6 +136,16 @@ public:
 		-> rpl::producer<Data::AllowedReactions> override;
 	void listShowPremiumToast(not_null<DocumentData*> document) override;
 
+	// CornerButtonsDelegate delegate.
+	void cornerButtonsShowAtPosition(
+		Data::MessagePosition position) override;
+	Dialogs::Entry *cornerButtonsEntry() override;
+	FullMsgId cornerButtonsCurrentId() override;
+	bool cornerButtonsIgnoreVisibility() override;
+	std::optional<bool> cornerButtonsDownShown() override;
+	bool cornerButtonsUnreadMayBeShown() override;
+	bool cornerButtonsHas(CornerButtonType type) override;
+
 protected:
 	void resizeEvent(QResizeEvent *e) override;
 	void paintEvent(QPaintEvent *e) override;
@@ -151,22 +164,12 @@ private:
 	void restoreState(not_null<ScheduledMemento*> memento);
 	void showAtPosition(
 		Data::MessagePosition position,
-		HistoryItem *originItem = nullptr);
-	bool showAtPositionNow(
-		Data::MessagePosition position,
-		HistoryItem *originItem);
+		FullMsgId originId = {});
 
 	void setupComposeControls();
 
 	void setupDragArea();
 
-	void setupScrollDownButton();
-	void scrollDownClicked();
-	void scrollDownAnimationFinish();
-	void updateScrollDownVisibility();
-	void updateScrollDownPosition();
-	void showAtEnd();
-
 	void confirmSendNowSelected();
 	void confirmDeleteSelected();
 	void clearSelected();
@@ -190,8 +193,6 @@ private:
 	[[nodiscard]] SendMenu::Type sendMenuType() const;
 
 	void pushReplyReturn(not_null<HistoryItem*> item);
-	void computeCurrentReplyReturn();
-	void calculateNextReplyReturn();
 	void checkReplyReturns();
 
 	void uploadFile(const QByteArray &fileContent, SendMediaType type);
@@ -242,16 +243,7 @@ private:
 
 	std::unique_ptr<HistoryView::StickerToast> _stickerToast;
 
-	std::vector<MsgId> _replyReturns;
-	HistoryItem *_replyReturn = nullptr;
-
-	FullMsgId _highlightMessageId;
-	std::optional<Data::MessagePosition> _nextAnimatedScrollPosition;
-	int _nextAnimatedScrollDelta = 0;
-
-	Ui::Animations::Simple _scrollDownShown;
-	bool _scrollDownIsShown = false;
-	object_ptr<Ui::HistoryDownButton> _scrollDown;
+	CornerButtons _cornerButtons;
 
 	Data::MessagesSlice _lastSlice;
 	bool _choosingAttach = false;