Add basic new messages animation.

Telegram/SourceFiles/data/data_session.cpp

@@ -1441,12 +1441,12 @@ rpl::producer<not_null<const ViewElement*>> Session::viewLayoutChanged() const {
 	return _viewLayoutChanges.events();
 }
 
-void Session::notifyUnreadItemAdded(not_null<HistoryItem*> item) {
-	_unreadItemAdded.fire_copy(item);
+void Session::notifyNewItemAdded(not_null<HistoryItem*> item) {
+	_newItemAdded.fire_copy(item);
 }
 
-rpl::producer<not_null<HistoryItem*>> Session::unreadItemAdded() const {
-	return _unreadItemAdded.events();
+rpl::producer<not_null<HistoryItem*>> Session::newItemAdded() const {
+	return _newItemAdded.events();
 }
 
 void Session::changeMessageId(ChannelId channel, MsgId wasId, MsgId nowId) {

Telegram/SourceFiles/data/data_session.h

@@ -235,8 +235,8 @@ public:
 	[[nodiscard]] rpl::producer<not_null<const HistoryItem*>> itemLayoutChanged() const;
 	void notifyViewLayoutChange(not_null<const ViewElement*> view);
 	[[nodiscard]] rpl::producer<not_null<const ViewElement*>> viewLayoutChanged() const;
-	void notifyUnreadItemAdded(not_null<HistoryItem*> item);
-	[[nodiscard]] rpl::producer<not_null<HistoryItem*>> unreadItemAdded() const;
+	void notifyNewItemAdded(not_null<HistoryItem*> item);
+	[[nodiscard]] rpl::producer<not_null<HistoryItem*>> newItemAdded() const;
 	void requestItemRepaint(not_null<const HistoryItem*> item);
 	[[nodiscard]] rpl::producer<not_null<const HistoryItem*>> itemRepaintRequest() const;
 	void requestViewRepaint(not_null<const ViewElement*> view);
@@ -836,7 +836,7 @@ private:
 	rpl::event_stream<IdChange> _itemIdChanges;
 	rpl::event_stream<not_null<const HistoryItem*>> _itemLayoutChanges;
 	rpl::event_stream<not_null<const ViewElement*>> _viewLayoutChanges;
-	rpl::event_stream<not_null<HistoryItem*>> _unreadItemAdded;
+	rpl::event_stream<not_null<HistoryItem*>> _newItemAdded;
 	rpl::event_stream<not_null<const HistoryItem*>> _itemRepaintRequest;
 	rpl::event_stream<not_null<const ViewElement*>> _viewRepaintRequest;
 	rpl::event_stream<not_null<const HistoryItem*>> _itemResizeRequest;

Telegram/SourceFiles/history/history.cpp

@@ -1072,16 +1072,16 @@ void History::newItemAdded(not_null<HistoryItem*> item) {
 	item->contributeToSlowmode();
 	if (item->showNotification()) {
 		_notifications.push_back(item);
-		owner().notifyUnreadItemAdded(item);
-		const auto stillShow = item->showNotification();
-		if (stillShow) {
-			Core::App().notifications().schedule(item);
-			if (!item->out() && item->unread()) {
-				if (unreadCountKnown()) {
-					setUnreadCount(unreadCount() + 1);
-				} else {
-					owner().histories().requestDialogEntry(this);
-				}
+	}
+	owner().notifyNewItemAdded(item);
+	const auto stillShow = item->showNotification(); // Could be read already.
+	if (stillShow) {
+		Core::App().notifications().schedule(item);
+		if (!item->out() && item->unread()) {
+			if (unreadCountKnown()) {
+				setUnreadCount(unreadCount() + 1);
+			} else {
+				owner().histories().requestDialogEntry(this);
 			}
 		}
 	} else if (item->out()) {

Telegram/SourceFiles/history/history_inner_widget.cpp

@@ -2369,6 +2369,21 @@ void HistoryInner::repaintScrollDateCallback() {
 	update(0, updateTop, width(), updateHeight);
 }
 
+void HistoryInner::setItemsRevealHeight(int revealHeight) {
+	_revealHeight = revealHeight;
+}
+
+void HistoryInner::changeItemsRevealHeight(int revealHeight) {
+	if (_revealHeight == revealHeight) {
+		return;
+	}
+	const auto old = std::exchange(_revealHeight, revealHeight);
+	resize(_scroll->width(), height() + old - _revealHeight);
+	if (!_revealHeight) {
+		mouseActionUpdate(QCursor::pos());
+	}
+}
+
 void HistoryInner::updateSize() {
 	int visibleHeight = _scroll->height();
 	int newHistoryPaddingTop = qMax(visibleHeight - historyHeight() - st::historyPaddingBottom, 0);
@@ -2393,11 +2408,13 @@ void HistoryInner::updateSize() {
 
 	_historyPaddingTop = newHistoryPaddingTop;
 
-	int newHeight = _historyPaddingTop + historyHeight() + st::historyPaddingBottom;
+	int newHeight = _historyPaddingTop + historyHeight() + st::historyPaddingBottom - _revealHeight;
 	if (width() != _scroll->width() || height() != newHeight) {
 		resize(_scroll->width(), newHeight);
 
-		mouseActionUpdate(QCursor::pos());
+		if (!_revealHeight) {
+			mouseActionUpdate(QCursor::pos());
+		}
 	} else {
 		update();
 	}

Telegram/SourceFiles/history/history_inner_widget.h

@@ -64,6 +64,8 @@ public:
 
 	void touchScrollUpdated(const QPoint &screenPos);
 
+	void setItemsRevealHeight(int revealHeight);
+	void changeItemsRevealHeight(int revealHeight);
 	void checkHistoryActivation();
 	void recountHistoryGeometry();
 	void updateSize();
@@ -345,6 +347,7 @@ private:
 	History *_migrated = nullptr;
 	int _contentWidth = 0;
 	int _historyPaddingTop = 0;
+	int _revealHeight = 0;
 
 	// Save visible area coords for painting / pressing userpics.
 	int _visibleAreaTop = 0;

Telegram/SourceFiles/history/history_widget.cpp

@@ -154,6 +154,7 @@ constexpr auto kSaveDraftTimeout = 1000;
 constexpr auto kSaveDraftAnywayTimeout = 5000;
 constexpr auto kSaveCloudDraftIdleTimeout = 14000;
 constexpr auto kRefreshSlowmodeLabelTimeout = crl::time(200);
+constexpr auto kItemRevealDuration = crl::time(200);
 constexpr auto kCommonModifiers = 0
 	| Qt::ShiftModifier
 	| Qt::MetaModifier
@@ -425,14 +426,9 @@ HistoryWidget::HistoryWidget(
 		}
 	}, lifetime());
 
-	session().data().unreadItemAdded(
+	session().data().newItemAdded(
 	) | rpl::start_with_next([=](not_null<HistoryItem*> item) {
-		unreadMessageAdded(item);
-	}, lifetime());
-
-	session().data().itemRemoved(
-	) | rpl::start_with_next([=](not_null<const HistoryItem*> item) {
-		itemRemoved(item);
+		newItemAdded(item);
 	}, lifetime());
 
 	session().data().historyChanged(
@@ -539,43 +535,25 @@ HistoryWidget::HistoryWidget(
 	}, lifetime());
 
 	session().changes().messageUpdates(
-		Data::MessageUpdate::Flag::Edited
+		Data::MessageUpdate::Flag::Destroyed
+		| Data::MessageUpdate::Flag::Edited
+		| Data::MessageUpdate::Flag::ReplyMarkup
+		| Data::MessageUpdate::Flag::BotCallbackSent
 	) | rpl::start_with_next([=](const Data::MessageUpdate &update) {
-		itemEdited(update.item);
-	}, lifetime());
-
-	session().changes().messageUpdates(
-		Data::MessageUpdate::Flag::ReplyMarkup
-	) | rpl::start_with_next([=](const Data::MessageUpdate &update) {
-		if (_keyboard->forMsgId() == update.item->fullId()) {
-			updateBotKeyboard(update.item->history(), true);
-		}
-	}, lifetime());
-
-	session().changes().messageUpdates(
-		Data::MessageUpdate::Flag::BotCallbackSent
-	) | rpl::start_with_next([=](const Data::MessageUpdate &update) {
-		const auto item = update.item;
-		if (item->id < 0 || _peer != item->history()->peer) {
+		if (update.flags & Data::MessageUpdate::Flag::Destroyed) {
+			itemRemoved(update.item);
 			return;
 		}
-
-		const auto keyId = _keyboard->forMsgId();
-		const auto lastKeyboardUsed = (keyId == FullMsgId(_channel, item->id))
-			&& (keyId == FullMsgId(_channel, _history->lastKeyboardId));
-
-		session().data().requestItemRepaint(item);
-
-		if (_replyToId == item->id) {
-			cancelReply();
+		if (update.flags & Data::MessageUpdate::Flag::Edited) {
+			itemEdited(update.item);
 		}
-		if (_keyboard->singleUse()
-			&& _keyboard->hasMarkup()
-			&& lastKeyboardUsed) {
-			if (_kbShown) {
-				toggleKeyboard(false);
+		if (update.flags & Data::MessageUpdate::Flag::ReplyMarkup) {
+			if (_keyboard->forMsgId() == update.item->fullId()) {
+				updateBotKeyboard(update.item->history(), true);
 			}
-			_history->lastKeyboardUsed = true;
+		}
+		if (update.flags & Data::MessageUpdate::Flag::BotCallbackSent) {
+			botCallbackSent(update.item);
 		}
 	}, lifetime());
 
@@ -1887,7 +1865,6 @@ void HistoryWidget::showHistory(
 
 	App::clearMousedItems();
 
-	_addToScroll = 0;
 	_saveEditMsgRequestId = 0;
 	_replyEditMsg = nullptr;
 	_editMsgId = _replyToId = 0;
@@ -1939,6 +1916,7 @@ void HistoryWidget::showHistory(
 
 	noSelectingScroll();
 	_nonEmptySelection = false;
+	_itemRevealPending.clear();
 
 	if (_peer) {
 		_history = _peer->owner().history(_peer);
@@ -2447,8 +2425,10 @@ void HistoryWidget::destroyUnreadBarOnClose() {
 	}
 }
 
-void HistoryWidget::unreadMessageAdded(not_null<HistoryItem*> item) {
-	if (_history != item->history() || !_historyInited) {
+void HistoryWidget::newItemAdded(not_null<HistoryItem*> item) {
+	if (_history != item->history()
+		|| !_historyInited
+		|| item->isScheduled()) {
 		return;
 	}
 
@@ -2459,21 +2439,28 @@ void HistoryWidget::unreadMessageAdded(not_null<HistoryItem*> item) {
 	// - on second we get wrong doWeReadServerHistory() and read both.
 	session().data().sendHistoryChangeNotifications();
 
-	const auto atBottom = (_scroll->scrollTop() >= _scroll->scrollTopMax());
-	if (!atBottom) {
+	if (item->isSending()) {
+		synteticScrollToY(_scroll->scrollTopMax());
+	} else if (_scroll->scrollTop() < _scroll->scrollTopMax()) {
 		return;
 	}
-	destroyUnreadBar();
-	if (!doWeReadServerHistory()) {
-		return;
-	}
-	if (item->isUnreadMention() && !item->isUnreadMedia()) {
-		session().api().markMediaRead(item);
-	}
-	session().data().histories().readInboxOnNewMessage(item);
+	if (item->showNotification()) {
+		destroyUnreadBar();
+		if (doWeReadServerHistory()) {
+			if (item->isUnreadMention() && !item->isUnreadMedia()) {
+				session().api().markMediaRead(item);
+			}
+			session().data().histories().readInboxOnNewMessage(item);
 
-	// Also clear possible scheduled messages notifications.
-	Core::App().notifications().clearFromHistory(_history);
+			// Also clear possible scheduled messages notifications.
+			Core::App().notifications().clearFromHistory(_history);
+		}
+	}
+	const auto view = item->mainView();
+	if (anim::Disabled() || !view) {
+		return;
+	}
+	_itemRevealPending.emplace(item);
 }
 
 void HistoryWidget::unreadCountUpdated() {
@@ -2904,9 +2891,13 @@ void HistoryWidget::delayedShowAt(MsgId showAtMsgId) {
 }
 
 void HistoryWidget::handleScroll() {
-	preloadHistoryIfNeeded();
+	if (!_itemsRevealHeight) {
+		preloadHistoryIfNeeded();
+	}
 	visibleAreaUpdated();
-	updatePinnedViewer();
+	if (!_itemsRevealHeight) {
+		updatePinnedViewer();
+	}
 	if (!_synteticScrollEvent) {
 		_lastUserScrolled = crl::now();
 	}
@@ -4692,6 +4683,11 @@ void HistoryWidget::itemRemoved(not_null<const HistoryItem*> item) {
 			updateControlsGeometry();
 		}
 	}
+	const auto i = _itemRevealAnimations.find(item);
+	if (i != end(_itemRevealAnimations)) {
+		_itemRevealAnimations.erase(i);
+		revealItemsCallback();
+	}
 }
 
 void HistoryWidget::itemEdited(not_null<HistoryItem*> item) {
@@ -4784,6 +4780,9 @@ void HistoryWidget::updateHistoryGeometry(
 		bool initial,
 		bool loadedDown,
 		const ScrollChange &change) {
+	const auto guard = gsl::finally([&] {
+		_itemRevealPending.clear();
+	});
 	if (!_history || (initial && _historyInited) || (!initial && !_historyInited)) {
 		return;
 	}
@@ -4867,20 +4866,74 @@ void HistoryWidget::updateHistoryGeometry(
 			newScrollTop += change.value;
 		} else if (change.type == ScrollChangeNoJumpToBottom) {
 			newScrollTop = wasScrollTop;
-		} else if (const auto add = base::take(_addToScroll)) {
-			newScrollTop += add;
 		}
 	}
 	const auto toY = std::clamp(newScrollTop, 0, _scroll->scrollTopMax());
 	synteticScrollToY(toY);
 }
 
+void HistoryWidget::revealItemsCallback() {
+	auto height = 0;
+	if (!_historyInited) {
+		_itemRevealAnimations.clear();
+	}
+	for (auto i = begin(_itemRevealAnimations)
+		; i != end(_itemRevealAnimations);) {
+		if (!i->second.animation.animating()) {
+			i = _itemRevealAnimations.erase(i);
+		} else {
+			height += anim::interpolate(
+				i->second.startHeight,
+				0,
+				i->second.animation.value(1.));
+			++i;
+		}
+	}
+	if (_itemsRevealHeight != height) {
+		const auto wasScrollTop = _scroll->scrollTop();
+		const auto wasAtBottom = (wasScrollTop == _scroll->scrollTopMax());
+
+		_itemsRevealHeight = height;
+		_list->changeItemsRevealHeight(_itemsRevealHeight);
+
+		const auto newScrollTop = (wasAtBottom && !_history->unreadBar())
+			? countAutomaticScrollTop()
+			: _list->historyScrollTop();
+		const auto toY = std::clamp(newScrollTop, 0, _scroll->scrollTopMax());
+		synteticScrollToY(toY);
+	}
+}
+
 void HistoryWidget::updateListSize() {
 	_list->recountHistoryGeometry();
 	auto washidden = _scroll->isHidden();
 	if (washidden) {
 		_scroll->show();
 	}
+	for (const auto item : base::take(_itemRevealPending)) {
+		if (const auto view = item->mainView()) {
+			if (const auto top = _list->itemTop(view); top >= 0) {
+				if (const auto height = view->height()) {
+					if (!_itemRevealAnimations.contains(item)) {
+						auto &animation = _itemRevealAnimations[item];
+						if (!animation.animation.animating()) {
+							animation.startHeight
+								= animation.currentHeight
+								= height;
+							_itemsRevealHeight += height;
+							animation.animation.start(
+								[=] { revealItemsCallback(); },
+								0.,
+								1.,
+								kItemRevealDuration,
+								anim::easeOutCirc);
+						}
+					}
+				}
+			}
+		}
+	}
+	_list->setItemsRevealHeight(_itemsRevealHeight);
 	_list->updateSize();
 	if (washidden) {
 		_scroll->hide();
@@ -5029,6 +5082,30 @@ void HistoryWidget::updateBotKeyboard(History *h, bool force) {
 	update();
 }
 
+void HistoryWidget::botCallbackSent(not_null<HistoryItem*> item) {
+	if (item->id < 0 || _peer != item->history()->peer) {
+		return;
+	}
+
+	const auto keyId = _keyboard->forMsgId();
+	const auto lastKeyboardUsed = (keyId == FullMsgId(_channel, item->id))
+		&& (keyId == FullMsgId(_channel, _history->lastKeyboardId));
+
+	session().data().requestItemRepaint(item);
+
+	if (_replyToId == item->id) {
+		cancelReply();
+	}
+	if (_keyboard->singleUse()
+		&& _keyboard->hasMarkup()
+		&& lastKeyboardUsed) {
+		if (_kbShown) {
+			toggleKeyboard(false);
+		}
+		_history->lastKeyboardUsed = true;
+	}
+}
+
 int HistoryWidget::computeMaxFieldHeight() const {
 	const auto available = height()
 		- _topBar->height()

Telegram/SourceFiles/history/history_widget.h

@@ -225,6 +225,7 @@ public:
 	// With force=true the markup is updated even if it is
 	// already shown for the passed history item.
 	void updateBotKeyboard(History *h = nullptr, bool force = false);
+	void botCallbackSent(not_null<HistoryItem*> item);
 
 	void fastShowAtEnd(not_null<History*> history);
 	void applyDraft(
@@ -321,6 +322,11 @@ private:
 		Fn<void(MessageIdsList)> callback;
 		bool active = false;
 	};
+	struct ItemRevealAnimation {
+		int startHeight = 0;
+		int currentHeight = 0;
+		Ui::Animations::Simple animation;
+	};
 	enum class TextUpdateEvent {
 		SaveDraft = (1 << 0),
 		SendTyping = (1 << 1),
@@ -414,7 +420,7 @@ private:
 	void historyDownAnimationFinish();
 	void unreadMentionsAnimationFinish();
 	void sendButtonClicked();
-	void unreadMessageAdded(not_null<HistoryItem*> item);
+	void newItemAdded(not_null<HistoryItem*> item);
 
 	bool canSendFiles(not_null<const QMimeData*> data) const;
 	bool confirmSendingFiles(
@@ -530,6 +536,7 @@ private:
 
 	void updateHistoryGeometry(bool initial = false, bool loadedDown = false, const ScrollChange &change = { ScrollChangeNone, 0 });
 	void updateListSize();
+	void revealItemsCallback();
 
 	// Does any of the shown histories has this flag set.
 	bool hasPendingResizedItems() const;
@@ -664,7 +671,6 @@ private:
 	bool _historyInited = false;
 	// If updateListSize() was called without updateHistoryGeometry().
 	bool _updateHistoryGeometryRequired = false;
-	int _addToScroll = 0;
 
 	int _lastScrollTop = 0; // gifs optimization
 	crl::time _lastScrolled = 0;
@@ -755,6 +761,12 @@ private:
 	base::weak_ptr<Ui::Toast::Instance> _topToast;
 	std::unique_ptr<ChooseMessagesForReport> _chooseForReport;
 
+	base::flat_set<not_null<HistoryItem*>> _itemRevealPending;
+	base::flat_map<
+		not_null<HistoryItem*>,
+		ItemRevealAnimation> _itemRevealAnimations;
+	int _itemsRevealHeight = 0;
+
 	object_ptr<Ui::PlainShadow> _topShadow;
 	bool _inGrab = false;
 

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -1124,7 +1124,7 @@ bool ListWidget::loadedAtBottom() const {
 }
 
 bool ListWidget::isEmpty() const {
-	return loadedAtTop() && loadedAtBottom() && (_itemsHeight == 0);
+	return loadedAtTop() && loadedAtBottom();
 }
 
 int ListWidget::itemMinimalHeight() const {