Clear hidden animated stickers.

Telegram/SourceFiles/boxes/background_preview_box.cpp

@@ -756,31 +756,3 @@ bool BackgroundPreviewBox::Start(
 HistoryView::Context BackgroundPreviewBox::elementContext() {
 	return HistoryView::Context::ContactPreview;
 }
-
-std::unique_ptr<HistoryView::Element> BackgroundPreviewBox::elementCreate(
-		not_null<HistoryMessage*> message) {
-	return std::make_unique<HistoryView::Message>(delegate(), message);
-}
-
-std::unique_ptr<HistoryView::Element> BackgroundPreviewBox::elementCreate(
-		not_null<HistoryService*> message) {
-	Unexpected("Service message in BackgroundPreviewBox.");
-}
-
-bool BackgroundPreviewBox::elementUnderCursor(
-		not_null<const Element*> view) {
-	return false;
-}
-
-void BackgroundPreviewBox::elementAnimationAutoplayAsync(
-	not_null<const Element*> element) {
-}
-
-crl::time BackgroundPreviewBox::elementHighlightTime(
-		not_null<const Element*> element) {
-	return crl::time(0);
-}
-
-bool BackgroundPreviewBox::elementInSelectionMode() {
-	return false;
-}

Telegram/SourceFiles/boxes/background_preview_box.h

@@ -21,7 +21,7 @@ class Checkbox;
 
 class BackgroundPreviewBox
 	: public BoxContent
-	, private HistoryView::ElementDelegate {
+	, private HistoryView::SimpleElementDelegate {
 public:
 	BackgroundPreviewBox(QWidget*, const Data::WallPaper &paper);
 
@@ -38,16 +38,6 @@ private:
 	using Element = HistoryView::Element;
 	not_null<HistoryView::ElementDelegate*> delegate();
 	HistoryView::Context elementContext() override;
-	std::unique_ptr<Element> elementCreate(
-		not_null<HistoryMessage*> message) override;
-	std::unique_ptr<Element> elementCreate(
-		not_null<HistoryService*> message) override;
-	bool elementUnderCursor(not_null<const Element*> view) override;
-	void elementAnimationAutoplayAsync(
-		not_null<const Element*> element) override;
-	crl::time elementHighlightTime(
-		not_null<const Element*> element) override;
-	bool elementInSelectionMode() override;
 
 	void apply();
 	void share();

Telegram/SourceFiles/data/data_session.cpp

@@ -1251,6 +1251,58 @@ void Session::sendHistoryChangeNotifications() {
 	}
 }
 
+void Session::registerHeavyViewPart(not_null<ViewElement*> view) {
+	_heavyViewParts.emplace(view);
+}
+
+void Session::unregisterHeavyViewPart(not_null<ViewElement*> view) {
+	_heavyViewParts.remove(view);
+}
+
+void Session::unloadHeavyViewParts(
+		not_null<HistoryView::ElementDelegate*> delegate) {
+	if (_heavyViewParts.empty()) {
+		return;
+	}
+	const auto remove = ranges::count(_heavyViewParts, delegate, [](not_null<ViewElement*> element) {
+		return element->delegate();
+	});
+	if (remove == _heavyViewParts.size()) {
+		for (const auto view : base::take(_heavyViewParts)) {
+			view->unloadHeavyPart();
+		}
+	} else {
+		auto remove = std::vector<not_null<ViewElement*>>();
+		for (const auto view : _heavyViewParts) {
+			if (view->delegate() == delegate) {
+				remove.push_back(view);
+			}
+		}
+		for (const auto view : remove) {
+			view->unloadHeavyPart();
+		}
+	}
+}
+
+void Session::unloadHeavyViewParts(
+		not_null<HistoryView::ElementDelegate*> delegate,
+		int from,
+		int till) {
+	if (_heavyViewParts.empty()) {
+		return;
+	}
+	auto remove = std::vector<not_null<ViewElement*>>();
+	for (const auto view : _heavyViewParts) {
+		if (view->delegate() == delegate
+			&& !delegate->elementIntersectsRange(view, from, till)) {
+			remove.push_back(view);
+		}
+	}
+	for (const auto view : remove) {
+		view->unloadHeavyPart();
+	}
+}
+
 void Session::removeMegagroupParticipant(
 		not_null<ChannelData*> channel,
 		not_null<UserData*> user) {

Telegram/SourceFiles/data/data_session.h

@@ -30,6 +30,7 @@ enum class NewMessageType;
 namespace HistoryView {
 struct Group;
 class Element;
+class ElementDelegate;
 } // namespace HistoryView
 
 class AuthSession;
@@ -198,6 +199,15 @@ public:
 	[[nodiscard]] rpl::producer<not_null<History*>> historyChanged() const;
 	void sendHistoryChangeNotifications();
 
+	void registerHeavyViewPart(not_null<ViewElement*> view);
+	void unregisterHeavyViewPart(not_null<ViewElement*> view);
+	void unloadHeavyViewParts(
+		not_null<HistoryView::ElementDelegate*> delegate);
+	void unloadHeavyViewParts(
+		not_null<HistoryView::ElementDelegate*> delegate,
+		int from,
+		int till);
+
 	using MegagroupParticipant = std::tuple<
 		not_null<ChannelData*>,
 		not_null<UserData*>>;
@@ -909,6 +919,8 @@ private:
 		not_null<const HistoryItem*>,
 		std::vector<not_null<ViewElement*>>> _views;
 
+	base::flat_set<not_null<ViewElement*>> _heavyViewParts;
+
 	PeerData *_proxyPromoted = nullptr;
 
 	NotifySettings _defaultUserNotifySettings;

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp

@@ -525,6 +525,17 @@ bool InnerWidget::elementInSelectionMode() {
 	return false;
 }
 
+bool InnerWidget::elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) {
+	Expects(view->delegate() == this);
+
+	const auto top = itemTop(view);
+	const auto bottom = top + view->height();
+	return (top < till && bottom > from);
+}
+
 void InnerWidget::saveState(not_null<SectionMemento*> memento) {
 	memento->setFilter(std::move(_filter));
 	memento->setAdmins(std::move(_admins));

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.h

@@ -89,6 +89,10 @@ public:
 	crl::time elementHighlightTime(
 		not_null<const HistoryView::Element*> element) override;
 	bool elementInSelectionMode() override;
+	bool elementIntersectsRange(
+		not_null<const HistoryView::Element*> view,
+		int from,
+		int till) override;
 
 	~InnerWidget();
 

Telegram/SourceFiles/history/history_inner_widget.cpp

@@ -51,6 +51,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 namespace {
 
 constexpr auto kScrollDateHideTimeout = 1000;
+constexpr auto kUnloadHeavyPartsPages = 3;
 
 // Helper binary search for an item in a list that is not completely
 // above the given top of the visible area or below the given bottom of the visible area
@@ -76,6 +77,8 @@ int BinarySearchBlocksOrItems(const T &list, int edge) {
 
 // flick scroll taken from http://qt-project.org/doc/qt-4.8/demos-embedded-anomaly-src-flickcharm-cpp.html
 
+HistoryInner *HistoryInner::Instance = nullptr;
+
 class HistoryInner::BotAbout : public ClickHandlerHost {
 public:
 	BotAbout(not_null<HistoryInner*> parent, not_null<BotInfo*> info);
@@ -127,6 +130,8 @@ HistoryInner::HistoryInner(
 , _scroll(scroll)
 , _scrollDateCheck([this] { scrollDateCheck(); })
 , _scrollDateHideTimer([this] { scrollDateHideByTimer(); }) {
+	Instance = this;
+
 	_touchSelectTimer.setSingleShot(true);
 	connect(&_touchSelectTimer, SIGNAL(timeout()), this, SLOT(onTouchSelect()));
 
@@ -2097,6 +2102,7 @@ void HistoryInner::visibleAreaUpdated(int top, int bottom) {
 	auto scrolledUp = (top < _visibleAreaTop);
 	_visibleAreaTop = top;
 	_visibleAreaBottom = bottom;
+	const auto visibleAreaHeight = bottom - top;
 
 	// if history has pending resize events we should not update scrollTopItem
 	if (hasPendingResizedItems()) {
@@ -2130,6 +2136,12 @@ void HistoryInner::visibleAreaUpdated(int top, int bottom) {
 	} else {
 		scrollDateHideByTimer();
 	}
+
+	// Unload lottie animations.
+	const auto pages = kUnloadHeavyPartsPages;
+	const auto from = _visibleAreaTop - pages * visibleAreaHeight;
+	const auto till = _visibleAreaBottom + pages * visibleAreaHeight;
+	Auth().data().unloadHeavyViewParts(ElementDelegate(), from, till);
 }
 
 bool HistoryInner::displayScrollDate() const {
@@ -2243,6 +2255,9 @@ void HistoryInner::leaveEventHook(QEvent *e) {
 }
 
 HistoryInner::~HistoryInner() {
+	if (Instance == this) {
+		Instance = nullptr;
+	}
 	delete _menu;
 	_mouseAction = MouseAction::None;
 }
@@ -2345,6 +2360,18 @@ bool HistoryInner::inSelectionMode() const {
 	return false;
 }
 
+bool HistoryInner::elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) const {
+	const auto top = itemTop(view);
+	if (top < 0) {
+		return false;
+	}
+	const auto bottom = top + view->height();
+	return (top < till && bottom > from);
+}
+
 auto HistoryInner::getSelectionState() const
 -> HistoryView::TopBarWidget::SelectedState {
 	auto result = HistoryView::TopBarWidget::SelectedState {};
@@ -3179,7 +3206,15 @@ not_null<HistoryView::ElementDelegate*> HistoryInner::ElementDelegate() {
 			return crl::time(0);
 		}
 		bool elementInSelectionMode() override {
-			return App::main()->historyInSelectionMode();
+			return Instance ? Instance->inSelectionMode() : false;
+		}
+		bool elementIntersectsRange(
+				not_null<const Element*> view,
+				int from,
+				int till) override {
+			return Instance
+				? Instance->elementIntersectsRange(view, from, till)
+				: false;
 		}
 
 	};

Telegram/SourceFiles/history/history_inner_widget.h

@@ -73,6 +73,10 @@ public:
 	MessageIdsList getSelectedItems() const;
 	void selectItem(not_null<HistoryItem*> item);
 	bool inSelectionMode() const;
+	bool elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) const;
 
 	void updateBotInfo(bool recount = true);
 
@@ -296,6 +300,8 @@ private:
 	// Does any of the shown histories has this flag set.
 	bool hasPendingResizedItems() const;
 
+	static HistoryInner *Instance;
+
 	not_null<Window::Controller*> _controller;
 
 	const not_null<PeerData*> _peer;

Telegram/SourceFiles/history/history_widget.cpp

@@ -850,10 +850,6 @@ int HistoryWidget::itemTopForHighlight(
 	return qMax(itemTop - (heightLeft / 2), 0);
 }
 
-bool HistoryWidget::inSelectionMode() const {
-	return _list ? _list->inSelectionMode() : false;
-}
-
 void HistoryWidget::start() {
 	Auth().data().stickersUpdated(
 	) | rpl::start_with_next([this] {
@@ -1643,6 +1639,9 @@ void HistoryWidget::showHistory(
 	_showAtMsgId = showAtMsgId;
 	_historyInited = false;
 
+	// Unload lottie animations.
+	Auth().data().unloadHeavyViewParts(HistoryInner::ElementDelegate());
+
 	if (peerId) {
 		_peer = Auth().data().peer(peerId);
 		_channel = peerToChannel(_peer->id);

Telegram/SourceFiles/history/history_widget.h

@@ -186,7 +186,6 @@ public:
 
 	void enqueueMessageHighlight(not_null<HistoryView::Element*> view);
 	crl::time highlightStartTime(not_null<const HistoryItem*> item) const;
-	bool inSelectionMode() const;
 
 	MessageIdsList getSelectedItems() const;
 	void itemEdited(HistoryItem *item);

Telegram/SourceFiles/history/media/history_media.h

@@ -220,6 +220,9 @@ public:
 		return true;
 	}
 
+	virtual void unloadHeavyPart() {
+	}
+
 	// Should be called only by Data::Session.
 	virtual void updateSharedContactUserId(UserId userId) {
 	}

Telegram/SourceFiles/history/media/history_media_sticker.cpp

@@ -39,7 +39,9 @@ HistorySticker::HistorySticker(
 	}
 }
 
-HistorySticker::~HistorySticker() = default;
+HistorySticker::~HistorySticker() {
+	unloadLottie();
+}
 
 QSize HistorySticker::countOptimalSize() {
 	auto sticker = _data->sticker();
@@ -93,9 +95,14 @@ QSize HistorySticker::countCurrentSize(int newWidth) {
 }
 
 void HistorySticker::setupLottie() {
+	if (_lottie) {
+		return;
+	}
 	_lottie = _data->data().isEmpty()
 		? Lottie::FromFile(_data->filepath())
 		: Lottie::FromData(_data->data());
+	_parent->data()->history()->owner().registerHeavyViewPart(_parent);
+
 	_lottie->updates(
 	) | rpl::start_with_next_error([=](Lottie::Update update) {
 		update.data.match([&](const Lottie::Information &information) {
@@ -107,6 +114,14 @@ void HistorySticker::setupLottie() {
 	}, _lifetime);
 }
 
+void HistorySticker::unloadLottie() {
+	if (!_lottie) {
+		return;
+	}
+	_lottie = nullptr;
+	_parent->data()->history()->owner().unregisterHeavyViewPart(_parent);
+}
+
 void HistorySticker::draw(Painter &p, const QRect &r, TextSelection selection, crl::time ms) const {
 	if (!_lottie && _data->filename().endsWith(qstr(".json"))) {
 		if (_data->loaded()) {

Telegram/SourceFiles/history/media/history_media_sticker.h

@@ -55,6 +55,10 @@ public:
 		return true;
 	}
 
+	void unloadHeavyPart() override {
+		unloadLottie();
+	}
+
 private:
 	QSize countOptimalSize() override;
 	QSize countCurrentSize(int newWidth) override;
@@ -64,6 +68,7 @@ private:
 	int additionalWidth() const;
 
 	void setupLottie();
+	void unloadLottie();
 
 	int _pixw = 1;
 	int _pixh = 1;

Telegram/SourceFiles/history/view/history_view_element.cpp

@@ -8,6 +8,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_element.h"
 
 #include "history/view/history_view_service_message.h"
+#include "history/view/history_view_message.h"
 #include "history/history_item_components.h"
 #include "history/history_item.h"
 #include "history/media/history_media.h"
@@ -47,6 +48,42 @@ bool IsAttachedToPreviousInSavedMessages(
 
 } // namespace
 
+
+std::unique_ptr<HistoryView::Element> SimpleElementDelegate::elementCreate(
+		not_null<HistoryMessage*> message) {
+	return std::make_unique<HistoryView::Message>(this, message);
+}
+
+std::unique_ptr<HistoryView::Element> SimpleElementDelegate::elementCreate(
+		not_null<HistoryService*> message) {
+	return std::make_unique<HistoryView::Service>(this, message);
+}
+
+bool SimpleElementDelegate::elementUnderCursor(
+		not_null<const Element*> view) {
+	return false;
+}
+
+void SimpleElementDelegate::elementAnimationAutoplayAsync(
+	not_null<const Element*> element) {
+}
+
+crl::time SimpleElementDelegate::elementHighlightTime(
+	not_null<const Element*> element) {
+	return crl::time(0);
+}
+
+bool SimpleElementDelegate::elementInSelectionMode() {
+	return false;
+}
+
+bool SimpleElementDelegate::elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) {
+	return true;
+}
+
 TextSelection UnshiftItemSelection(
 		TextSelection selection,
 		uint16 byLength) {
@@ -526,6 +563,12 @@ bool Element::hasVisibleText() const {
 	return false;
 }
 
+void Element::unloadHeavyPart() {
+	if (_media) {
+		_media->unloadHeavyPart();
+	}
+}
+
 HistoryBlock *Element::block() {
 	return _block;
 }

Telegram/SourceFiles/history/view/history_view_element.h

@@ -46,9 +46,31 @@ public:
 	virtual crl::time elementHighlightTime(
 		not_null<const Element*> element) = 0;
 	virtual bool elementInSelectionMode() = 0;
+	virtual bool elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) = 0;
 
 };
 
+class SimpleElementDelegate : public ElementDelegate {
+public:
+	std::unique_ptr<Element> elementCreate(
+		not_null<HistoryMessage*> message) override;
+	std::unique_ptr<Element> elementCreate(
+		not_null<HistoryService*> message) override;
+	bool elementUnderCursor(not_null<const Element*> view) override;
+	void elementAnimationAutoplayAsync(
+		not_null<const Element*> element) override;
+	crl::time elementHighlightTime(
+		not_null<const Element*> element) override;
+	bool elementInSelectionMode() override;
+	bool elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) override;
+};
+
 TextSelection UnshiftItemSelection(
 	TextSelection selection,
 	uint16 byLength);
@@ -232,6 +254,8 @@ public:
 	virtual TimeId displayedEditDate() const;
 	virtual bool hasVisibleText() const;
 
+	virtual void unloadHeavyPart();
+
 	// Legacy blocks structure.
 	HistoryBlock *block();
 	const HistoryBlock *block() const;

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -1126,6 +1126,17 @@ bool ListWidget::elementInSelectionMode() {
 	return hasSelectedItems() || !_dragSelected.empty();
 }
 
+bool ListWidget::elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) {
+	Expects(view->delegate() == this);
+
+	const auto top = itemTop(view);
+	const auto bottom = top + view->height();
+	return (top < till && bottom > from);
+}
+
 void ListWidget::saveState(not_null<ListMemento*> memento) {
 	memento->setAroundPosition(_aroundPosition);
 	auto state = countScrollState();

Telegram/SourceFiles/history/view/history_view_list_widget.h

@@ -180,6 +180,10 @@ public:
 		not_null<const Element*> view) override;
 	crl::time elementHighlightTime(not_null<const Element*> element) override;
 	bool elementInSelectionMode() override;
+	bool elementIntersectsRange(
+		not_null<const Element*> view,
+		int from,
+		int till) override;
 
 	~ListWidget();
 

Telegram/SourceFiles/mainwidget.cpp

@@ -967,10 +967,6 @@ crl::time MainWidget::highlightStartTime(not_null<const HistoryItem*> item) cons
 	return _history->highlightStartTime(item);
 }
 
-bool MainWidget::historyInSelectionMode() const {
-	return _history->inSelectionMode();
-}
-
 MsgId MainWidget::currentReplyToIdFor(not_null<History*> history) const {
 	if (_history->history() == history) {
 		return _history->replyToId();

Telegram/SourceFiles/mainwidget.h

@@ -199,7 +199,6 @@ public:
 
 	// While HistoryInner is not HistoryView::ListWidget.
 	crl::time highlightStartTime(not_null<const HistoryItem*> item) const;
-	bool historyInSelectionMode() const;
 
 	MsgId currentReplyToIdFor(not_null<History*> history) const;
 

Telegram/SourceFiles/settings/settings_privacy_controllers.cpp

@@ -682,36 +682,6 @@ HistoryView::Context ForwardsPrivacyController::elementContext() {
 	return HistoryView::Context::ContactPreview;
 }
 
-auto ForwardsPrivacyController::elementCreate(
-	not_null<HistoryMessage*> message)
--> std::unique_ptr<HistoryView::Element> {
-	return std::make_unique<HistoryView::Message>(delegate(), message);
-}
-
-auto ForwardsPrivacyController::elementCreate(
-	not_null<HistoryService*> message)
--> std::unique_ptr<HistoryView::Element> {
-	Unexpected("Service message in ForwardsPrivacyController.");
-}
-
-bool ForwardsPrivacyController::elementUnderCursor(
-		not_null<const Element*> view) {
-	return false;
-}
-
-void ForwardsPrivacyController::elementAnimationAutoplayAsync(
-	not_null<const Element*> element) {
-}
-
-crl::time ForwardsPrivacyController::elementHighlightTime(
-		not_null<const Element*> element) {
-	return crl::time(0);
-}
-
-bool ForwardsPrivacyController::elementInSelectionMode() {
-	return false;
-}
-
 ApiWrap::Privacy::Key ProfilePhotoPrivacyController::key() {
 	return Key::ProfilePhoto;
 }

Telegram/SourceFiles/settings/settings_privacy_controllers.h

@@ -109,7 +109,7 @@ public:
 
 class ForwardsPrivacyController
 	: public EditPrivacyBox::Controller
-	, private HistoryView::ElementDelegate {
+	, private HistoryView::SimpleElementDelegate {
 public:
 	using Option = EditPrivacyBox::Option;
 	using Exception = EditPrivacyBox::Exception;
@@ -132,16 +132,6 @@ private:
 	using Element = HistoryView::Element;
 	not_null<HistoryView::ElementDelegate*> delegate();
 	HistoryView::Context elementContext() override;
-	std::unique_ptr<Element> elementCreate(
-		not_null<HistoryMessage*> message) override;
-	std::unique_ptr<Element> elementCreate(
-		not_null<HistoryService*> message) override;
-	bool elementUnderCursor(not_null<const Element*> view) override;
-	void elementAnimationAutoplayAsync(
-		not_null<const Element*> element) override;
-	crl::time elementHighlightTime(
-		not_null<const Element*> element) override;
-	bool elementInSelectionMode() override;
 
 	static void PaintForwardedTooltip(
 		Painter &p,

Telegram/SourceFiles/support/support_autocomplete.cpp

@@ -577,31 +577,4 @@ HistoryView::Context ConfirmContactBox::elementContext() {
 	return HistoryView::Context::ContactPreview;
 }
 
-std::unique_ptr<HistoryView::Element> ConfirmContactBox::elementCreate(
-		not_null<HistoryMessage*> message) {
-	return std::make_unique<HistoryView::Message>(this, message);
-}
-
-std::unique_ptr<HistoryView::Element> ConfirmContactBox::elementCreate(
-		not_null<HistoryService*> message) {
-	return std::make_unique<HistoryView::Service>(this, message);
-}
-
-bool ConfirmContactBox::elementUnderCursor(not_null<const Element*> view) {
-	return false;
-}
-
-void ConfirmContactBox::elementAnimationAutoplayAsync(
-	not_null<const Element*> element) {
-}
-
-crl::time ConfirmContactBox::elementHighlightTime(
-		not_null<const Element*> element) {
-	return crl::time(0);
-}
-
-bool ConfirmContactBox::elementInSelectionMode() {
-	return false;
-}
-
 } // namespace Support

Telegram/SourceFiles/support/support_autocomplete.h

@@ -59,7 +59,7 @@ private:
 
 class ConfirmContactBox
 	: public BoxContent
-	, public HistoryView::ElementDelegate {
+	, public HistoryView::SimpleElementDelegate {
 public:
 	ConfirmContactBox(
 		QWidget*,
@@ -69,16 +69,6 @@ public:
 
 	using Element = HistoryView::Element;
 	HistoryView::Context elementContext() override;
-	std::unique_ptr<Element> elementCreate(
-		not_null<HistoryMessage*> message) override;
-	std::unique_ptr<Element> elementCreate(
-		not_null<HistoryService*> message) override;
-	bool elementUnderCursor(not_null<const Element*> view) override;
-	void elementAnimationAutoplayAsync(
-		not_null<const Element*> element) override;
-	crl::time elementHighlightTime(
-		not_null<const Element*> element) override;
-	bool elementInSelectionMode() override;
 
 protected:
 	void prepare() override;