diff --git a/Telegram/SourceFiles/dialogs/dialogs_widget.cpp b/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
index a051e8aab..bfb703c2b 100644
--- a/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
+++ b/Telegram/SourceFiles/dialogs/dialogs_widget.cpp
@@ -744,15 +744,15 @@ void Widget::changeOpenedSubsection(
 	if (isHidden()) {
 		animated = anim::type::instant;
 	}
-	auto cacheUnder = QPixmap();
+	auto oldContentCache = QPixmap();
 	const auto showDirection = fromRight
 		? Window::SlideDirection::FromRight
 		: Window::SlideDirection::FromLeft;
 	if (animated == anim::type::normal) {
 		_connecting->setForceHidden(true);
-		cacheUnder = grabForFolderSlideAnimation();
+		oldContentCache = grabForFolderSlideAnimation();
 	}
-	_a_show.stop();
+	_showAnimation = nullptr;
 	change();
 	refreshTopBars();
 	updateControlsVisibility(true);
@@ -760,9 +760,12 @@ void Widget::changeOpenedSubsection(
 	_api.request(base::take(_topicSearchRequest)).cancel();
 	if (animated == anim::type::normal) {
 		_connecting->setForceHidden(true);
-		auto cacheOver = grabForFolderSlideAnimation();
+		auto newContentCache = grabForFolderSlideAnimation();
 		_connecting->setForceHidden(false);
-		startSlideAnimation();
+		startSlideAnimation(
+			std::move(oldContentCache),
+			std::move(newContentCache),
+			showDirection);
 	}
 }
 
@@ -872,7 +875,7 @@ void Widget::refreshTopBars() {
 			}
 		}, _forumGroupCallBar->lifetime());
 
-		if (_a_show.animating()) {
+		if (_showAnimation) {
 			_forumTopShadow->hide();
 			_forumGroupCallBar->hide();
 			_forumRequestsBar->hide();
@@ -1048,7 +1051,7 @@ void Widget::startWidthAnimation() {
 
 void Widget::stopWidthAnimation() {
 	_widthAnimationCache = QPixmap();
-	if (!_a_show.animating()) {
+	if (!_showAnimation) {
 		_scroll->show();
 	}
 	update();
@@ -1062,21 +1065,27 @@ void Widget::showFast() {
 }
 
 void Widget::showAnimated(Window::SlideDirection direction, const Window::SectionSlideParams &params) {
-	_showDirection = direction;
-	_a_show.stop();
+	_showAnimation = nullptr;
 
-	_cacheUnder = params.oldContentCache;
+	auto oldContentCache = params.oldContentCache;
 	showFast();
-	_cacheOver = controller()->content()->grabForShowAnimation(params);
+	const auto content = controller()->content();
+	auto newContentCache = content->grabForShowAnimation(params);
 
 	if (_updateTelegram) {
 		_updateTelegram->hide();
 	}
 	_connecting->setForceHidden(true);
-	startSlideAnimation();
+	startSlideAnimation(
+		std::move(oldContentCache),
+		std::move(newContentCache),
+		direction);
 }
 
-void Widget::startSlideAnimation() {
+void Widget::startSlideAnimation(
+		QPixmap oldContentCache,
+		QPixmap newContentCache,
+		Window::SlideDirection direction) {
 	_scroll->hide();
 	_searchControls->hide();
 	if (_subsectionTopBar) {
@@ -1095,10 +1104,12 @@ void Widget::startSlideAnimation() {
 		_forumReportBar->bar().hide();
 	}
 
-	if (_showDirection == Window::SlideDirection::FromLeft) {
-		std::swap(_cacheUnder, _cacheOver);
-	}
-	_a_show.start([=] { animationCallback(); }, 0., 1., st::slideDuration, Window::SlideAnimation::transition());
+	_showAnimation = std::make_unique<Window::SlideAnimation>();
+	_showAnimation->setDirection(direction);
+	_showAnimation->setRepaintCallback([=] { update(); });
+	_showAnimation->setFinishedCallback([=] { slideFinished(); });
+	_showAnimation->setPixmaps(oldContentCache, newContentCache);
+	_showAnimation->start();
 }
 
 bool Widget::floatPlayerHandleWheelEvent(QEvent *e) {
@@ -1109,17 +1120,12 @@ QRect Widget::floatPlayerAvailableRect() {
 	return mapToGlobal(_scroll->geometry());
 }
 
-void Widget::animationCallback() {
-	update();
-	if (!_a_show.animating()) {
-		_cacheUnder = _cacheOver = QPixmap();
-
-		updateControlsVisibility(true);
-
-		if ((!_subsectionTopBar || !_subsectionTopBar->searchHasFocus())
-			&& !_filter->hasFocus()) {
-			controller()->widget()->setInnerFocus();
-		}
+void Widget::slideFinished() {
+	_showAnimation = nullptr;
+	updateControlsVisibility(true);
+	if ((!_subsectionTopBar || !_subsectionTopBar->searchHasFocus())
+		&& !_filter->hasFocus()) {
+		controller()->widget()->setInnerFocus();
 	}
 }
 
@@ -1854,7 +1860,7 @@ void Widget::listScrollUpdated() {
 }
 
 void Widget::applyFilterUpdate(bool force) {
-	if (_a_show.animating() && !force) {
+	if (_showAnimation && !force) {
 		return;
 	}
 
@@ -2099,7 +2105,7 @@ void Widget::resizeEvent(QResizeEvent *e) {
 }
 
 void Widget::updateLockUnlockVisibility() {
-	if (_a_show.animating()) {
+	if (_showAnimation) {
 		return;
 	}
 	const auto hidden = !session().domain().local().hasLocalPasscode();
@@ -2110,7 +2116,7 @@ void Widget::updateLockUnlockVisibility() {
 }
 
 void Widget::updateLoadMoreChatsVisibility() {
-	if (_a_show.animating() || !_loadMoreChats) {
+	if (_showAnimation || !_loadMoreChats) {
 		return;
 	}
 	const auto hidden = (_openedFolder != nullptr)
@@ -2123,7 +2129,9 @@ void Widget::updateLoadMoreChatsVisibility() {
 }
 
 void Widget::updateJumpToDateVisibility(bool fast) {
-	if (_a_show.animating()) return;
+	if (_showAnimation) {
+		return;
+	}
 
 	_jumpToDate->toggle(
 		(_searchInChat && _filter->getLastText().isEmpty()),
@@ -2306,24 +2314,8 @@ void Widget::paintEvent(QPaintEvent *e) {
 	if (r != rect()) {
 		p.setClipRect(r);
 	}
-	if (_a_show.animating()) {
-		const auto progress = _a_show.value(1.);
-		const auto top = 0;
-		const auto shift = std::min(st::slideShift, width() / 2);
-		const auto retina = cIntRetinaFactor();
-		const auto fromLeft = (_showDirection == Window::SlideDirection::FromLeft);
-		const auto coordUnder = fromLeft ? anim::interpolate(-shift, 0, progress) : anim::interpolate(0, -shift, progress);
-		const auto coordOver = fromLeft ? anim::interpolate(0, width(), progress) : anim::interpolate(width(), 0, progress);
-		const auto shadow = fromLeft ? (1. - progress) : progress;
-		if (coordOver > 0) {
-			p.drawPixmap(QRect(0, top, coordOver, _cacheUnder.height() / retina), _cacheUnder, QRect(-coordUnder * retina, 0, coordOver * retina, _cacheUnder.height()));
-			p.setOpacity(shadow);
-			p.fillRect(0, top, coordOver, _cacheUnder.height() / retina, st::slideFadeOutBg);
-			p.setOpacity(1);
-		}
-		p.drawPixmap(QRect(coordOver, top, _cacheOver.width() / retina, _cacheOver.height() / retina), _cacheOver, QRect(0, 0, _cacheOver.width(), _cacheOver.height()));
-		p.setOpacity(shadow);
-		st::slideShadow.fill(p, QRect(coordOver - st::slideShadow.width(), top, st::slideShadow.width(), _cacheOver.height() / retina));
+	if (_showAnimation) {
+		_showAnimation->paintContents(p);
 		return;
 	}
 	auto above = QRect(0, 0, width(), _scroll->y());
diff --git a/Telegram/SourceFiles/dialogs/dialogs_widget.h b/Telegram/SourceFiles/dialogs/dialogs_widget.h
index b914d747e..9461296dc 100644
--- a/Telegram/SourceFiles/dialogs/dialogs_widget.h
+++ b/Telegram/SourceFiles/dialogs/dialogs_widget.h
@@ -139,7 +139,7 @@ private:
 	bool searchMessages(bool searchCache = false);
 	void needSearchMessages();
 
-	void animationCallback();
+	void slideFinished();
 	void searchReceived(
 		SearchRequestType type,
 		const MTPmessages_Messages &result,
@@ -182,7 +182,10 @@ private:
 	void changeOpenedForum(Data::Forum *forum, anim::type animated);
 	void hideChildList();
 	[[nodiscard]] QPixmap grabForFolderSlideAnimation();
-	void startSlideAnimation();
+	void startSlideAnimation(
+		QPixmap oldContentCache,
+		QPixmap newContentCache,
+		Window::SlideDirection direction);
 
 	void fullSearchRefreshOn(rpl::producer<> events);
 	void applyFilterUpdate(bool force = false);
@@ -233,9 +236,7 @@ private:
 	std::unique_ptr<Window::ConnectionState> _connecting;
 
 	Ui::Animations::Simple _scrollToAnimation;
-	Ui::Animations::Simple _a_show;
-	Window::SlideDirection _showDirection = Window::SlideDirection();
-	QPixmap _cacheUnder, _cacheOver;
+	std::unique_ptr<Window::SlideAnimation> _showAnimation;
 
 	Ui::Animations::Simple _scrollToTopShown;
 	object_ptr<Ui::HistoryDownButton> _scrollToTop;
diff --git a/Telegram/SourceFiles/history/history_widget.cpp b/Telegram/SourceFiles/history/history_widget.cpp
index b4fc56fe3..5136e58fe 100644
--- a/Telegram/SourceFiles/history/history_widget.cpp
+++ b/Telegram/SourceFiles/history/history_widget.cpp
@@ -803,7 +803,7 @@ HistoryWidget::HistoryWidget(
 	session().data().itemVisibilityQueries(
 	) | rpl::filter([=](
 			const Data::Session::ItemVisibilityQuery &query) {
-		return !_a_show.animating()
+		return !_showAnimation
 			&& (_history == query.item->history())
 			&& (query.item->mainView() != nullptr)
 			&& isVisible();
@@ -2620,13 +2620,13 @@ std::optional<QString> HistoryWidget::writeRestriction() const {
 }
 
 void HistoryWidget::updateControlsVisibility() {
-	if (!_a_show.animating()) {
+	if (!_showAnimation) {
 		_topShadow->setVisible(_peer != nullptr);
 		_topBar->setVisible(_peer != nullptr);
 	}
 	_cornerButtons.updateJumpDownVisibility();
 	_cornerButtons.updateUnreadThingsVisibility();
-	if (!_history || _a_show.animating()) {
+	if (!_history || _showAnimation) {
 		hideChildWidgets();
 		return;
 	}
@@ -3161,7 +3161,7 @@ bool HistoryWidget::markingContentsRead() const {
 		&& _historyInited
 		&& !_firstLoadRequest
 		&& !_delayedShowAtRequest
-		&& !_a_show.animating()
+		&& !_showAnimation
 		&& controller()->widget()->markingAsRead();
 }
 
@@ -3940,11 +3940,7 @@ MsgId HistoryWidget::msgId() const {
 void HistoryWidget::showAnimated(
 		Window::SlideDirection direction,
 		const Window::SectionSlideParams &params) {
-	_showDirection = direction;
-
-	_a_show.stop();
-
-	_cacheUnder = params.oldContentCache;
+	_showAnimation = nullptr;
 
 	// If we show pinned bar here, we don't want it to change the
 	// calculated and prepared scrollTop of the messages history.
@@ -3965,40 +3961,40 @@ void HistoryWidget::showAnimated(
 	_preserveScrollTop = false;
 	_stickerToast = nullptr;
 
-	_cacheOver = controller()->content()->grabForShowAnimation(params);
+	auto newContentCache = Ui::GrabWidget(this);
 
 	hideChildWidgets();
 	if (params.withTopBarShadow) _topShadow->show();
 
-	if (_showDirection == Window::SlideDirection::FromLeft) {
-		std::swap(_cacheUnder, _cacheOver);
-	}
-	_a_show.start([=] { animationCallback(); }, 0., 1., st::slideDuration, Window::SlideAnimation::transition());
 	if (_history) {
 		_topBar->show();
 		_topBar->setAnimatingMode(true);
 	}
 
+	_showAnimation = std::make_unique<Window::SlideAnimation>();
+	_showAnimation->setDirection(direction);
+	_showAnimation->setRepaintCallback([=] { update(); });
+	_showAnimation->setFinishedCallback([=] { showFinished(); });
+	_showAnimation->setPixmaps(params.oldContentCache, newContentCache);
+	_showAnimation->start();
+
 	activate();
 }
 
-void HistoryWidget::animationCallback() {
-	update();
-	if (!_a_show.animating()) {
-		_cornerButtons.finishAnimations();
-		if (_pinnedBar) {
-			_pinnedBar->finishAnimating();
-		}
-		if (_groupCallBar) {
-			_groupCallBar->finishAnimating();
-		}
-		if (_requestsBar) {
-			_requestsBar->finishAnimating();
-		}
-		_cacheUnder = _cacheOver = QPixmap();
-		doneShow();
-		synteticScrollToY(_scroll->scrollTop());
+void HistoryWidget::showFinished() {
+	_cornerButtons.finishAnimations();
+	if (_pinnedBar) {
+		_pinnedBar->finishAnimating();
 	}
+	if (_groupCallBar) {
+		_groupCallBar->finishAnimating();
+	}
+	if (_requestsBar) {
+		_requestsBar->finishAnimating();
+	}
+	_showAnimation = nullptr;
+	doneShow();
+	synteticScrollToY(_scroll->scrollTop());
 }
 
 void HistoryWidget::doneShow() {
@@ -4083,10 +4079,10 @@ void HistoryWidget::checkSuggestToGigagroup() {
 }
 
 void HistoryWidget::finishAnimating() {
-	if (!_a_show.animating()) {
+	if (!_showAnimation) {
 		return;
 	}
-	_a_show.stop();
+	_showAnimation = nullptr;
 	_topShadow->setVisible(_peer != nullptr);
 	_topBar->setVisible(_peer != nullptr);
 	_cornerButtons.finishAnimations();
@@ -4549,7 +4545,7 @@ bool HistoryWidget::kbWasHidden() const {
 }
 
 void HistoryWidget::toggleKeyboard(bool manual) {
-	auto fieldEnabled = canWriteMessage() && !_a_show.animating();
+	auto fieldEnabled = canWriteMessage() && !_showAnimation;
 	if (_kbShown || _kbReplyTo) {
 		_botKeyboardHide->hide();
 		if (_kbShown) {
@@ -4621,7 +4617,7 @@ void HistoryWidget::toggleKeyboard(bool manual) {
 	}
 	updateControlsGeometry();
 	updateFieldPlaceholder();
-	if (_botKeyboardHide->isHidden() && canWriteMessage() && !_a_show.animating()) {
+	if (_botKeyboardHide->isHidden() && canWriteMessage() && !_showAnimation) {
 		_tabbedSelectorToggle->show();
 	} else {
 		_tabbedSelectorToggle->hide();
@@ -4882,7 +4878,7 @@ void HistoryWidget::fieldFocused() {
 }
 
 void HistoryWidget::checkFieldAutocomplete() {
-	if (!_history || _a_show.animating()) {
+	if (!_history || _showAnimation) {
 		return;
 	}
 
@@ -5441,7 +5437,7 @@ void HistoryWidget::updateHistoryGeometry(
 	if (!_history || (initial && _historyInited) || (!initial && !_historyInited)) {
 		return;
 	}
-	if (_firstLoadRequest || _a_show.animating()) {
+	if (_firstLoadRequest || _showAnimation) {
 		_updateHistoryGeometryRequired = true;
 		return; // scrollTopMax etc are not working after recountHistoryGeometry()
 	}
@@ -5742,7 +5738,7 @@ void HistoryWidget::updateBotKeyboard(History *h, bool force) {
 			_history->lastKeyboardHiddenId = _history->lastKeyboardId;
 		}
 		if (!isSearching() && !isBotStart() && !isBlocked() && _canSendMessages && (wasVisible || (_replyToId && _replyEditMsg) || (!HasSendText(_field) && !kbWasHidden()))) {
-			if (!_a_show.animating()) {
+			if (!_showAnimation) {
 				if (hasMarkup) {
 					_kbScroll->show();
 					_tabbedSelectorToggle->hide();
@@ -5767,7 +5763,7 @@ void HistoryWidget::updateBotKeyboard(History *h, bool force) {
 				updateReplyEditText(_kbReplyTo);
 			}
 		} else {
-			if (!_a_show.animating()) {
+			if (!_showAnimation) {
 				_kbScroll->hide();
 				_tabbedSelectorToggle->show();
 				_botKeyboardHide->hide();
@@ -5847,7 +5843,7 @@ int HistoryWidget::computeMaxFieldHeight() const {
 }
 
 bool HistoryWidget::cornerButtonsIgnoreVisibility() {
-	return _a_show.animating();
+	return _showAnimation != nullptr;
 }
 
 std::optional<bool> HistoryWidget::cornerButtonsDownShown() {
@@ -6302,7 +6298,7 @@ void HistoryWidget::checkPinnedBarState() {
 
 	orderWidgets();
 
-	if (_a_show.animating()) {
+	if (_showAnimation) {
 		_pinnedBar->hide();
 	}
 }
@@ -6478,7 +6474,7 @@ void HistoryWidget::setupGroupCallBar() {
 
 	orderWidgets();
 
-	if (_a_show.animating()) {
+	if (_showAnimation) {
 		_groupCallBar->hide();
 	}
 }
@@ -6525,7 +6521,7 @@ void HistoryWidget::setupRequestsBar() {
 
 	orderWidgets();
 
-	if (_a_show.animating()) {
+	if (_showAnimation) {
 		_requestsBar->hide();
 	}
 }
@@ -7193,7 +7189,7 @@ void HistoryWidget::handlePeerUpdate() {
 			session().api().chatParticipants().requestAdmins(channel);
 		}
 	}
-	if (!_a_show.animating()) {
+	if (!_showAnimation) {
 		if (_unblock->isHidden() == isBlocked()
 			|| (!isBlocked() && _joinChannel->isHidden() == isJoinChannel())) {
 			resize = true;
@@ -7637,28 +7633,12 @@ void HistoryWidget::paintEditHeader(Painter &p, const QRect &rect, int left, int
 }
 
 bool HistoryWidget::paintShowAnimationFrame() {
-	auto progress = _a_show.value(1.);
-	if (!_a_show.animating()) {
-		return false;
+	if (_showAnimation) {
+		QPainter p(this);
+		_showAnimation->paintContents(p);
+		return true;
 	}
-
-	Painter p(this);
-	auto animationWidth = width();
-	auto retina = cIntRetinaFactor();
-	auto fromLeft = (_showDirection == Window::SlideDirection::FromLeft);
-	auto coordUnder = fromLeft ? anim::interpolate(-st::slideShift, 0, progress) : anim::interpolate(0, -st::slideShift, progress);
-	auto coordOver = fromLeft ? anim::interpolate(0, animationWidth, progress) : anim::interpolate(animationWidth, 0, progress);
-	auto shadow = fromLeft ? (1. - progress) : progress;
-	if (coordOver > 0) {
-		p.drawPixmap(QRect(0, 0, coordOver, height()), _cacheUnder, QRect(-coordUnder * retina, 0, coordOver * retina, height() * retina));
-		p.setOpacity(shadow);
-		p.fillRect(0, 0, coordOver, height(), st::slideFadeOutBg);
-		p.setOpacity(1);
-	}
-	p.drawPixmap(QRect(coordOver, 0, _cacheOver.width() / retina, height()), _cacheOver, QRect(0, 0, _cacheOver.width(), height() * retina));
-	p.setOpacity(shadow);
-	st::slideShadow.fill(p, QRect(coordOver - st::slideShadow.width(), 0, st::slideShadow.width(), height()));
-	return true;
+	return false;
 }
 
 void HistoryWidget::paintEvent(QPaintEvent *e) {
diff --git a/Telegram/SourceFiles/history/history_widget.h b/Telegram/SourceFiles/history/history_widget.h
index bda30bfec..1dea2549e 100644
--- a/Telegram/SourceFiles/history/history_widget.h
+++ b/Telegram/SourceFiles/history/history_widget.h
@@ -162,7 +162,9 @@ public:
 	bool hasTopBarShadow() const {
 		return peer() != nullptr;
 	}
-	void showAnimated(Window::SlideDirection direction, const Window::SectionSlideParams &params);
+	void showAnimated(
+		Window::SlideDirection direction,
+		const Window::SectionSlideParams &params);
 	void finishAnimating();
 
 	void doneShow();
@@ -403,7 +405,7 @@ private:
 
 	auto computeSendButtonType() const;
 
-	void animationCallback();
+	void showFinished();
 	void updateOverStates(QPoint pos);
 	void chooseAttach(std::optional<bool> overrideSendImagesAsPhotos = {});
 	void sendButtonClicked();
@@ -754,9 +756,7 @@ private:
 
 	QString _confirmSource;
 
-	Ui::Animations::Simple _a_show;
-	Window::SlideDirection _showDirection;
-	QPixmap _cacheUnder, _cacheOver;
+	std::unique_ptr<Window::SlideAnimation> _showAnimation;
 
 	HistoryView::ElementHighlighter _highlighter;
 
diff --git a/Telegram/SourceFiles/intro/intro_widget.cpp b/Telegram/SourceFiles/intro/intro_widget.cpp
index f9b6c0753..89fa20aee 100644
--- a/Telegram/SourceFiles/intro/intro_widget.cpp
+++ b/Telegram/SourceFiles/intro/intro_widget.cpp
@@ -297,7 +297,7 @@ void Widget::checkUpdateStatus() {
 				this,
 				tr::lng_menu_update(),
 				st::defaultBoxButton));
-		if (!_a_show.animating()) {
+		if (!_showAnimation) {
 			_update->setVisible(true);
 		}
 		const auto stepHasCover = getStep()->hasCover();
@@ -699,62 +699,47 @@ void Widget::hideControls() {
 	_back->hide(anim::type::instant);
 }
 
-void Widget::showAnimated(const QPixmap &bgAnimCache, bool back) {
-	_showBack = back;
+void Widget::showAnimated(QPixmap oldContentCache, bool back) {
+	_showAnimation = nullptr;
 
-	(_showBack ? _cacheOver : _cacheUnder) = bgAnimCache;
-
-	_a_show.stop();
 	showControls();
 	floatPlayerHideAll();
-	(_showBack ? _cacheUnder : _cacheOver) = Ui::GrabWidget(this);
+	auto newContentCache = Ui::GrabWidget(this);
 	hideControls();
 	floatPlayerShowVisible();
 
-	_a_show.start(
-		[=] { animationCallback(); },
-		0.,
-		1.,
-		st::slideDuration,
-		Window::SlideAnimation::transition());
+	_showAnimation = std::make_unique<Window::SlideAnimation>();
+	_showAnimation->setDirection(back
+		? Window::SlideDirection::FromLeft
+		: Window::SlideDirection::FromRight);
+	_showAnimation->setRepaintCallback([=] { update(); });
+	_showAnimation->setFinishedCallback([=] { showFinished(); });
+	_showAnimation->setPixmaps(oldContentCache, newContentCache);
+	_showAnimation->start();
 
 	show();
 }
 
-void Widget::animationCallback() {
-	update();
-	if (!_a_show.animating()) {
-		_cacheUnder = _cacheOver = QPixmap();
+void Widget::showFinished() {
+	_showAnimation = nullptr;
 
-		showControls();
-		getStep()->activate();
-	}
+	showControls();
+	getStep()->activate();
 }
 
 void Widget::paintEvent(QPaintEvent *e) {
-	bool trivial = (rect() == e->rect());
+	const auto trivial = (rect() == e->rect());
 	setMouseTracking(true);
 
 	QPainter p(this);
 	if (!trivial) {
 		p.setClipRect(e->rect());
 	}
-	p.fillRect(e->rect(), st::windowBg);
-	auto progress = _a_show.value(1.);
-	if (_a_show.animating()) {
-		auto coordUnder = _showBack ? anim::interpolate(-st::slideShift, 0, progress) : anim::interpolate(0, -st::slideShift, progress);
-		auto coordOver = _showBack ? anim::interpolate(0, width(), progress) : anim::interpolate(width(), 0, progress);
-		auto shadow = _showBack ? (1. - progress) : progress;
-		if (coordOver > 0) {
-			p.drawPixmap(QRect(0, 0, coordOver, height()), _cacheUnder, QRect(-coordUnder * cRetinaFactor(), 0, coordOver * cRetinaFactor(), height() * cRetinaFactor()));
-			p.setOpacity(shadow);
-			p.fillRect(0, 0, coordOver, height(), st::slideFadeOutBg);
-			p.setOpacity(1);
-		}
-		p.drawPixmap(coordOver, 0, _cacheOver);
-		p.setOpacity(shadow);
-		st::slideShadow.fill(p, QRect(coordOver - st::slideShadow.width(), 0, st::slideShadow.width(), height()));
+	if (_showAnimation) {
+		_showAnimation->paintContents(p);
+		return;
 	}
+	p.fillRect(e->rect(), st::windowBg);
 }
 
 void Widget::resizeEvent(QResizeEvent *e) {
@@ -803,7 +788,7 @@ void Widget::updateControlsGeometry() {
 }
 
 void Widget::keyPressEvent(QKeyEvent *e) {
-	if (_a_show.animating() || getStep()->animating()) return;
+	if (_showAnimation || getStep()->animating()) return;
 
 	if (e->key() == Qt::Key_Escape || e->key() == Qt::Key_Back) {
 		if (getStep()->hasBack()) {
diff --git a/Telegram/SourceFiles/intro/intro_widget.h b/Telegram/SourceFiles/intro/intro_widget.h
index 96882b15f..e40d914c9 100644
--- a/Telegram/SourceFiles/intro/intro_widget.h
+++ b/Telegram/SourceFiles/intro/intro_widget.h
@@ -30,6 +30,7 @@ class FadeWrap;
 namespace Window {
 class ConnectionState;
 class Controller;
+class SlideAnimation;
 } // namespace Window
 
 namespace Intro {
@@ -96,15 +97,14 @@ public:
 		not_null<Window::Controller*> controller,
 		not_null<Main::Account*> account,
 		EnterPoint point);
+	~Widget();
 
-	void showAnimated(const QPixmap &bgAnimCache, bool back = false);
+	void showAnimated(QPixmap oldContentCache, bool back = false);
 
 	void setInnerFocus();
 
 	[[nodiscard]] rpl::producer<> showSettingsRequested() const;
 
-	~Widget();
-
 protected:
 	void paintEvent(QPaintEvent *e) override;
 	void resizeEvent(QResizeEvent *e) override;
@@ -112,7 +112,7 @@ protected:
 
 private:
 	void refreshLang();
-	void animationCallback();
+	void showFinished();
 	void createLanguageLink();
 	void checkUpdateStatus();
 	void setupNextButton();
@@ -175,9 +175,7 @@ private:
 	std::optional<MTP::Sender> _api;
 	mtpRequestId _nearestDcRequestId = 0;
 
-	Ui::Animations::Simple _a_show;
-	bool _showBack = false;
-	QPixmap _cacheUnder, _cacheOver;
+	std::unique_ptr<Window::SlideAnimation> _showAnimation;
 
 	std::vector<details::Step*> _stepHistory;
 	rpl::lifetime _stepLifetime;
diff --git a/Telegram/SourceFiles/mainwidget.cpp b/Telegram/SourceFiles/mainwidget.cpp
index 994089b4e..3f7f2041d 100644
--- a/Telegram/SourceFiles/mainwidget.cpp
+++ b/Telegram/SourceFiles/mainwidget.cpp
@@ -816,7 +816,7 @@ void MainWidget::createPlayer() {
 		}, _player->lifetime());
 
 		orderWidgets();
-		if (_a_show.animating()) {
+		if (_showAnimation) {
 			_player->show(anim::type::instant);
 			_player->setVisible(false);
 			Shortcuts::ToggleMediaShortcuts(true);
@@ -825,7 +825,7 @@ void MainWidget::createPlayer() {
 		}
 	}
 	if (_player && !_player->toggled()) {
-		if (!_a_show.animating()) {
+		if (!_showAnimation) {
 			_player->show(anim::type::normal);
 			_playerHeight = _contentScrollAddToY = _player->contentHeight();
 			updateControlsGeometry();
@@ -916,7 +916,7 @@ void MainWidget::createCallTopBar() {
 		callTopBarHeightUpdated(value);
 	}, lifetime());
 	orderWidgets();
-	if (_a_show.animating()) {
+	if (_showAnimation) {
 		_callTopBar->show(anim::type::instant);
 		_callTopBar->setVisible(false);
 	} else {
@@ -980,7 +980,7 @@ void MainWidget::createExportTopBar(Export::View::Content &&data) {
 		}
 	}, _exportTopBar->lifetime());
 	orderWidgets();
-	if (_a_show.animating()) {
+	if (_showAnimation) {
 		_exportTopBar->show(anim::type::instant);
 		_exportTopBar->setVisible(false);
 	} else {
@@ -1318,7 +1318,7 @@ void MainWidget::showPeerHistory(
 	}
 
 	auto animatedShow = [&] {
-		if (_a_show.animating()
+		if (_showAnimation
 			|| Core::App().passcodeLocked()
 			|| (params.animated == anim::type::instant)) {
 			return false;
@@ -1369,7 +1369,7 @@ void MainWidget::showPeerHistory(
 	if (onlyDialogs) {
 		Assert(_dialogs != nullptr);
 		_history->hide();
-		if (!_a_show.animating()) {
+		if (!_showAnimation) {
 			if (animationParams) {
 				auto direction = back ? Window::SlideDirection::FromLeft : Window::SlideDirection::FromRight;
 				_dialogs->showAnimated(direction, animationParams);
@@ -1385,7 +1385,7 @@ void MainWidget::showPeerHistory(
 		if (isOneColumn() && _dialogs && !_dialogs->isHidden()) {
 			_dialogs->hide();
 		}
-		if (!_a_show.animating()) {
+		if (!_showAnimation) {
 			if (!animationParams.oldContentCache.isNull()) {
 				_history->showAnimated(
 					back
@@ -1661,7 +1661,7 @@ void MainWidget::showNewSection(
 	Assert(newMainSection || newThirdSection);
 
 	auto animatedShow = [&] {
-		if (_a_show.animating()
+		if (_showAnimation
 			|| Core::App().passcodeLocked()
 			|| (params.animated == anim::type::instant)
 			|| memento->instant()) {
@@ -1965,58 +1965,41 @@ void MainWidget::checkActivation() {
 	}
 }
 
-void MainWidget::showAnimated(const QPixmap &bgAnimCache, bool back) {
-	_showBack = back;
-	(_showBack ? _cacheOver : _cacheUnder) = bgAnimCache;
-
-	_a_show.stop();
+void MainWidget::showAnimated(QPixmap oldContentCache, bool back) {
+	_showAnimation = nullptr;
 
 	showAll();
 	floatPlayerHideAll();
-	(_showBack ? _cacheUnder : _cacheOver) = Ui::GrabWidget(this);
+	auto newContentCache = Ui::GrabWidget(this);
 	hideAll();
 	floatPlayerShowVisible();
 
-	_a_show.start(
-		[this] { animationCallback(); },
-		0.,
-		1.,
-		st::slideDuration,
-		Window::SlideAnimation::transition());
+	_showAnimation = std::make_unique<Window::SlideAnimation>();
+	_showAnimation->setDirection(back
+		? Window::SlideDirection::FromLeft
+		: Window::SlideDirection::FromRight);
+	_showAnimation->setRepaintCallback([=] { update(); });
+	_showAnimation->setFinishedCallback([=] { showFinished(); });
+	_showAnimation->setPixmaps(oldContentCache, newContentCache);
+	_showAnimation->start();
 
 	show();
 }
 
-void MainWidget::animationCallback() {
-	update();
-	if (!_a_show.animating()) {
-		_cacheUnder = _cacheOver = QPixmap();
+void MainWidget::showFinished() {
+	_showAnimation = nullptr;
 
-		showAll();
-		activate();
-	}
+	showAll();
+	activate();
 }
 
 void MainWidget::paintEvent(QPaintEvent *e) {
 	if (_background) {
 		checkChatBackground();
 	}
-
-	auto p = QPainter(this);
-	auto progress = _a_show.value(1.);
-	if (_a_show.animating()) {
-		auto coordUnder = _showBack ? anim::interpolate(-st::slideShift, 0, progress) : anim::interpolate(0, -st::slideShift, progress);
-		auto coordOver = _showBack ? anim::interpolate(0, width(), progress) : anim::interpolate(width(), 0, progress);
-		auto shadow = _showBack ? (1. - progress) : progress;
-		if (coordOver > 0) {
-			p.drawPixmap(QRect(0, 0, coordOver, height()), _cacheUnder, QRect(-coordUnder * cRetinaFactor(), 0, coordOver * cRetinaFactor(), height() * cRetinaFactor()));
-			p.setOpacity(shadow);
-			p.fillRect(0, 0, coordOver, height(), st::slideFadeOutBg);
-			p.setOpacity(1);
-		}
-		p.drawPixmap(coordOver, 0, _cacheOver);
-		p.setOpacity(shadow);
-		st::slideShadow.fill(p, QRect(coordOver - st::slideShadow.width(), 0, st::slideShadow.width(), height()));
+	if (_showAnimation) {
+		auto p = QPainter(this);
+		_showAnimation->paintContents(p);
 	}
 }
 
@@ -2653,7 +2636,7 @@ bool MainWidget::contentOverlapped(const QRect &globalRect) {
 }
 
 void MainWidget::activate() {
-	if (_a_show.animating()) {
+	if (_showAnimation) {
 		return;
 	} else if (const auto paths = cSendPaths(); !paths.isEmpty()) {
 		const auto interpret = u"interpret://"_q;
@@ -2688,7 +2671,7 @@ void MainWidget::activate() {
 }
 
 bool MainWidget::animatingShow() const {
-	return _a_show.animating();
+	return _showAnimation != nullptr;
 }
 
 bool MainWidget::isOneColumn() const {
diff --git a/Telegram/SourceFiles/mainwidget.h b/Telegram/SourceFiles/mainwidget.h
index 88fe8937a..a38172a69 100644
--- a/Telegram/SourceFiles/mainwidget.h
+++ b/Telegram/SourceFiles/mainwidget.h
@@ -89,6 +89,7 @@ class TopBarWrapWidget;
 class SectionMemento;
 class SectionWidget;
 class AbstractSectionWidget;
+class SlideAnimation;
 class ConnectionState;
 struct SectionSlideParams;
 struct SectionShow;
@@ -137,7 +138,7 @@ public:
 
 	void returnTabbedSelector();
 
-	void showAnimated(const QPixmap &bgAnimCache, bool back = false);
+	void showAnimated(QPixmap oldContentCache, bool back = false);
 
 	void activate();
 
@@ -248,7 +249,7 @@ protected:
 	bool eventFilter(QObject *o, QEvent *e) override;
 
 private:
-	void animationCallback();
+	void showFinished();
 	void handleAdaptiveLayoutUpdate();
 	void updateWindowAdaptiveLayout();
 	void handleAudioUpdate(const Media::Player::TrackState &state);
@@ -342,9 +343,7 @@ private:
 
 	const not_null<Window::SessionController*> _controller;
 
-	Ui::Animations::Simple _a_show;
-	bool _showBack = false;
-	QPixmap _cacheUnder, _cacheOver;
+	std::unique_ptr<Window::SlideAnimation> _showAnimation;
 
 	int _dialogsWidth = 0;
 	int _thirdColumnWidth = 0;
diff --git a/Telegram/SourceFiles/mainwindow.cpp b/Telegram/SourceFiles/mainwindow.cpp
index b74246506..9f4a94504 100644
--- a/Telegram/SourceFiles/mainwindow.cpp
+++ b/Telegram/SourceFiles/mainwindow.cpp
@@ -172,15 +172,8 @@ void MainWindow::clearWidgetsHook() {
 	}
 }
 
-QPixmap MainWindow::grabInner() {
-	if (_passcodeLock) {
-		return Ui::GrabWidget(_passcodeLock);
-	} else if (_intro) {
-		return Ui::GrabWidget(_intro);
-	} else if (_main) {
-		return Ui::GrabWidget(_main);
-	}
-	return {};
+QPixmap MainWindow::grabForSlideAnimation() {
+	return Ui::GrabWidget(bodyWidget());
 }
 
 void MainWindow::preventOrInvoke(Fn<void()> callback) {
@@ -192,7 +185,7 @@ void MainWindow::preventOrInvoke(Fn<void()> callback) {
 
 void MainWindow::setupPasscodeLock() {
 	auto animated = (_main || _intro);
-	auto bg = animated ? grabInner() : QPixmap();
+	auto oldContentCache = animated ? grabForSlideAnimation() : QPixmap();
 	_passcodeLock.create(bodyWidget(), &controller());
 	updateControlsGeometry();
 
@@ -205,7 +198,7 @@ void MainWindow::setupPasscodeLock() {
 		_intro->hide();
 	}
 	if (animated) {
-		_passcodeLock->showAnimated(bg);
+		_passcodeLock->showAnimated(std::move(oldContentCache));
 	} else {
 		_passcodeLock->showFinished();
 		setInnerFocus();
@@ -213,29 +206,30 @@ void MainWindow::setupPasscodeLock() {
 }
 
 void MainWindow::clearPasscodeLock() {
+	Expects(_intro || _main);
+
 	if (!_passcodeLock) {
 		return;
 	}
 
+	auto oldContentCache = grabForSlideAnimation();
+	_passcodeLock.destroy();
 	if (_intro) {
-		auto bg = grabInner();
-		_passcodeLock.destroy();
 		_intro->show();
 		updateControlsGeometry();
-		_intro->showAnimated(bg, true);
+		_intro->showAnimated(std::move(oldContentCache), true);
 	} else if (_main) {
-		auto bg = grabInner();
-		_passcodeLock.destroy();
 		_main->show();
 		updateControlsGeometry();
-		_main->showAnimated(bg, true);
+		_main->showAnimated(std::move(oldContentCache), true);
 		Core::App().checkStartUrl();
 	}
 }
 
-void MainWindow::setupIntro(Intro::EnterPoint point) {
+void MainWindow::setupIntro(
+		Intro::EnterPoint point,
+		QPixmap oldContentCache) {
 	auto animated = (_main || _passcodeLock);
-	auto bg = animated ? grabInner() : QPixmap();
 
 	destroyLayer();
 	auto created = object_ptr<Intro::Widget>(
@@ -256,7 +250,7 @@ void MainWindow::setupIntro(Intro::EnterPoint point) {
 		_intro->show();
 		updateControlsGeometry();
 		if (animated) {
-			_intro->showAnimated(bg);
+			_intro->showAnimated(std::move(oldContentCache));
 		} else {
 			setInnerFocus();
 		}
@@ -264,12 +258,13 @@ void MainWindow::setupIntro(Intro::EnterPoint point) {
 	fixOrder();
 }
 
-void MainWindow::setupMain(MsgId singlePeerShowAtMsgId) {
+void MainWindow::setupMain(
+		MsgId singlePeerShowAtMsgId,
+		QPixmap oldContentCache) {
 	Expects(account().sessionExists());
 
 	const auto animated = _intro
 		|| (_passcodeLock && !Core::App().passcodeLocked());
-	const auto bg = animated ? grabInner() : QPixmap();
 	const auto weakAnimatedLayer = (_main && _layer && !_passcodeLock)
 		? Ui::MakeWeak(_layer.get())
 		: nullptr;
@@ -295,7 +290,7 @@ void MainWindow::setupMain(MsgId singlePeerShowAtMsgId) {
 		_main->show();
 		updateControlsGeometry();
 		if (animated) {
-			_main->showAnimated(bg);
+			_main->showAnimated(std::move(oldContentCache));
 		} else {
 			_main->activate();
 		}
diff --git a/Telegram/SourceFiles/mainwindow.h b/Telegram/SourceFiles/mainwindow.h
index 1fdb30349..66cf9ec1c 100644
--- a/Telegram/SourceFiles/mainwindow.h
+++ b/Telegram/SourceFiles/mainwindow.h
@@ -53,8 +53,8 @@ public:
 
 	void setupPasscodeLock();
 	void clearPasscodeLock();
-	void setupIntro(Intro::EnterPoint point);
-	void setupMain(MsgId singlePeerShowAtMsgId);
+	void setupIntro(Intro::EnterPoint point, QPixmap oldContentCache);
+	void setupMain(MsgId singlePeerShowAtMsgId, QPixmap oldContentCache);
 
 	void showSettings();
 
@@ -83,6 +83,8 @@ public:
 	void showMainMenu();
 	void fixOrder() override;
 
+	[[nodiscard]] QPixmap grabForSlideAnimation();
+
 	void showLayer(
 		std::unique_ptr<Ui::LayerWidget> &&layer,
 		Ui::LayerOptions options,
@@ -132,8 +134,6 @@ private:
 
 	void themeUpdated(const Window::Theme::BackgroundUpdate &data);
 
-	QPixmap grabInner();
-
 	std::unique_ptr<Media::SystemMediaControlsManager> _mediaControlsManager;
 
 	QPoint _lastMousePosition;
diff --git a/Telegram/SourceFiles/window/window_controller.cpp b/Telegram/SourceFiles/window/window_controller.cpp
index 62c12e8dc..1557f8a3d 100644
--- a/Telegram/SourceFiles/window/window_controller.cpp
+++ b/Telegram/SourceFiles/window/window_controller.cpp
@@ -103,10 +103,11 @@ void Controller::showAccount(
 		_sessionController = session
 			? std::make_unique<SessionController>(session, this)
 			: nullptr;
-		setupSideBar();
+		auto oldContentCache = _widget.grabForSlideAnimation();
 		_widget.updateWindowIcon();
 		if (session) {
-			setupMain(singlePeerShowAtMsgId);
+			setupSideBar();
+			setupMain(singlePeerShowAtMsgId, std::move(oldContentCache));
 
 			session->updates().isIdleValue(
 			) | rpl::filter([=](bool idle) {
@@ -125,7 +126,8 @@ void Controller::showAccount(
 
 			session->updates().updateOnline(crl::now());
 		} else {
-			setupIntro();
+			sideBarChanged();
+			setupIntro(std::move(oldContentCache));
 			_widget.updateGlobalMenu();
 		}
 
@@ -138,13 +140,11 @@ PeerData *Controller::singlePeer() const {
 }
 
 void Controller::setupSideBar() {
+	Expects(_sessionController != nullptr);
+
 	if (!isPrimary()) {
 		return;
 	}
-	if (!_sessionController) {
-		sideBarChanged();
-		return;
-	}
 	_sessionController->filtersMenuChanged(
 	) | rpl::start_with_next([=] {
 		sideBarChanged();
@@ -283,16 +283,19 @@ void Controller::clearPasscodeLock() {
 	}
 }
 
-void Controller::setupIntro() {
-	_widget.setupIntro(Core::App().domain().maybeLastOrSomeAuthedAccount()
+void Controller::setupIntro(QPixmap oldContentCache) {
+	const auto point = Core::App().domain().maybeLastOrSomeAuthedAccount()
 		? Intro::EnterPoint::Qr
-		: Intro::EnterPoint::Start);
+		: Intro::EnterPoint::Start;
+	_widget.setupIntro(point, std::move(oldContentCache));
 }
 
-void Controller::setupMain(MsgId singlePeerShowAtMsgId) {
+void Controller::setupMain(
+		MsgId singlePeerShowAtMsgId,
+		QPixmap oldContentCache) {
 	Expects(_sessionController != nullptr);
 
-	_widget.setupMain(singlePeerShowAtMsgId);
+	_widget.setupMain(singlePeerShowAtMsgId, std::move(oldContentCache));
 
 	if (const auto id = Ui::Emoji::NeedToSwitchBackToId()) {
 		Ui::Emoji::LoadAndSwitchTo(&_sessionController->session(), id);
diff --git a/Telegram/SourceFiles/window/window_controller.h b/Telegram/SourceFiles/window/window_controller.h
index c8a850ff3..076442b49 100644
--- a/Telegram/SourceFiles/window/window_controller.h
+++ b/Telegram/SourceFiles/window/window_controller.h
@@ -62,8 +62,6 @@ public:
 
 	void setupPasscodeLock();
 	void clearPasscodeLock();
-	void setupIntro();
-	void setupMain(MsgId singlePeerShowAtMsgId);
 
 	void showLogoutConfirmation();
 
@@ -121,6 +119,9 @@ private:
 	};
 	explicit Controller(CreateArgs &&args);
 
+	void setupIntro(QPixmap oldContentCache);
+	void setupMain(MsgId singlePeerShowAtMsgId, QPixmap oldContentCache);
+
 	void showAccount(
 		not_null<Main::Account*> account,
 		MsgId singlePeerShowAtMsgId);
diff --git a/Telegram/SourceFiles/window/window_lock_widgets.cpp b/Telegram/SourceFiles/window/window_lock_widgets.cpp
index c58c05127..0e6278549 100644
--- a/Telegram/SourceFiles/window/window_lock_widgets.cpp
+++ b/Telegram/SourceFiles/window/window_lock_widgets.cpp
@@ -34,6 +34,8 @@ LockWidget::LockWidget(QWidget *parent, not_null<Controller*> window)
 	show();
 }
 
+LockWidget::~LockWidget() = default;
+
 not_null<Controller*> LockWidget::window() const {
 	return _window;
 }
@@ -45,62 +47,40 @@ void LockWidget::setInnerFocus() {
 	setFocus();
 }
 
-void LockWidget::showAnimated(const QPixmap &bgAnimCache, bool back) {
-	_showBack = back;
-	(_showBack ? _cacheOver : _cacheUnder) = bgAnimCache;
-
-	_a_show.stop();
+void LockWidget::showAnimated(QPixmap oldContentCache) {
+	_showAnimation = nullptr;
 
 	showChildren();
 	setInnerFocus();
-	(_showBack ? _cacheUnder : _cacheOver) = Ui::GrabWidget(this);
+	auto newContentCache = Ui::GrabWidget(this);
 	hideChildren();
 
-	_a_show.start(
-		[this] { animationCallback(); },
-		0.,
-		1.,
-		st::slideDuration,
-		Window::SlideAnimation::transition());
-	show();
-}
+	_showAnimation = std::make_unique<Window::SlideAnimation>();
+	_showAnimation->setRepaintCallback([=] { update(); });
+	_showAnimation->setFinishedCallback([=] { showFinished(); });
+	_showAnimation->setPixmaps(oldContentCache, newContentCache);
+	_showAnimation->start();
 
-void LockWidget::animationCallback() {
-	update();
-	if (!_a_show.animating()) {
-		showFinished();
-	}
+	show();
 }
 
 void LockWidget::showFinished() {
 	showChildren();
 	_window->widget()->setInnerFocus();
+	_showAnimation = nullptr;
 	if (const auto controller = _window->sessionController()) {
 		controller->clearSectionStack();
 	}
-	_cacheUnder = _cacheOver = QPixmap();
 }
 
 void LockWidget::paintEvent(QPaintEvent *e) {
 	auto p = QPainter(this);
 
-	auto progress = _a_show.value(1.);
-	if (_a_show.animating()) {
-		auto coordUnder = _showBack ? anim::interpolate(-st::slideShift, 0, progress) : anim::interpolate(0, -st::slideShift, progress);
-		auto coordOver = _showBack ? anim::interpolate(0, width(), progress) : anim::interpolate(width(), 0, progress);
-		auto shadow = _showBack ? (1. - progress) : progress;
-		if (coordOver > 0) {
-			p.drawPixmap(QRect(0, 0, coordOver, height()), _cacheUnder, QRect(-coordUnder * cRetinaFactor(), 0, coordOver * cRetinaFactor(), height() * cRetinaFactor()));
-			p.setOpacity(shadow);
-			p.fillRect(0, 0, coordOver, height(), st::slideFadeOutBg);
-			p.setOpacity(1);
-		}
-		p.drawPixmap(coordOver, 0, _cacheOver);
-		p.setOpacity(shadow);
-		st::slideShadow.fill(p, QRect(coordOver - st::slideShadow.width(), 0, st::slideShadow.width(), height()));
-	} else {
-		paintContent(p);
+	if (_showAnimation) {
+		_showAnimation->paintContents(p);
+		return;
 	}
+	paintContent(p);
 }
 
 void LockWidget::paintContent(QPainter &p) {
diff --git a/Telegram/SourceFiles/window/window_lock_widgets.h b/Telegram/SourceFiles/window/window_lock_widgets.h
index d21bc585c..b55d0042d 100644
--- a/Telegram/SourceFiles/window/window_lock_widgets.h
+++ b/Telegram/SourceFiles/window/window_lock_widgets.h
@@ -26,16 +26,18 @@ class Session;
 namespace Window {
 
 class Controller;
+class SlideAnimation;
 
 class LockWidget : public Ui::RpWidget {
 public:
 	LockWidget(QWidget *parent, not_null<Controller*> window);
+	~LockWidget();
 
-	not_null<Controller*> window() const;
+	[[nodiscard]] not_null<Controller*> window() const;
 
 	virtual void setInnerFocus();
 
-	void showAnimated(const QPixmap &bgAnimCache, bool back = false);
+	void showAnimated(QPixmap oldContentCache);
 	void showFinished();
 
 protected:
@@ -43,12 +45,8 @@ protected:
 	virtual void paintContent(QPainter &p);
 
 private:
-	void animationCallback();
-
 	const not_null<Controller*> _window;
-	Ui::Animations::Simple _a_show;
-	bool _showBack = false;
-	QPixmap _cacheUnder, _cacheOver;
+	std::unique_ptr<SlideAnimation> _showAnimation;
 
 };