Show "Unlock emoji" button for premium sets.

Telegram/SourceFiles/boxes/premium_preview_box.cpp

@@ -1159,31 +1159,6 @@ void ReactionPreview::paintEffect(QPainter &p) {
 	return CreateGradientButton(parent, Ui::Premium::ButtonGradientStops());
 }
 
-[[nodiscard]] object_ptr<Ui::GradientButton> CreateUnlockButton(
-		QWidget *parent,
-		rpl::producer<QString> text) {
-	auto result = CreatePremiumButton(parent);
-	const auto &st = st::premiumPreviewBox.button;
-	result->resize(result->width(), st.height);
-
-	const auto label = Ui::CreateChild<Ui::FlatLabel>(
-		result.data(),
-		std::move(text),
-		st::premiumPreviewButtonLabel);
-	label->setAttribute(Qt::WA_TransparentForMouseEvents);
-	rpl::combine(
-		result->widthValue(),
-		label->widthValue()
-	) | rpl::start_with_next([=](int outer, int width) {
-		label->moveToLeft(
-			(outer - width) / 2,
-			st::premiumPreviewBox.button.textTop,
-			outer);
-	}, label->lifetime());
-
-	return result;
-}
-
 [[nodiscard]] object_ptr<Ui::RpWidget> CreateSwitch(
 		not_null<Ui::RpWidget*> parent,
 		not_null<rpl::variable<PremiumPreview>*> selected) {
@@ -1793,3 +1768,28 @@ void DoubledLimitsPreviewBox(
 	});
 	Ui::Premium::ShowListBox(box, std::move(entries));
 }
+
+object_ptr<Ui::GradientButton> CreateUnlockButton(
+		QWidget *parent,
+		rpl::producer<QString> text) {
+	auto result = CreatePremiumButton(parent);
+	const auto &st = st::premiumPreviewBox.button;
+	result->resize(result->width(), st.height);
+
+	const auto label = Ui::CreateChild<Ui::FlatLabel>(
+		result.data(),
+		std::move(text),
+		st::premiumPreviewButtonLabel);
+	label->setAttribute(Qt::WA_TransparentForMouseEvents);
+	rpl::combine(
+		result->widthValue(),
+		label->widthValue()
+	) | rpl::start_with_next([=](int outer, int width) {
+		label->moveToLeft(
+			(outer - width) / 2,
+			st::premiumPreviewBox.button.textTop,
+			outer);
+	}, label->lifetime());
+
+	return result;
+}

Telegram/SourceFiles/boxes/premium_preview_box.h

@@ -7,10 +7,13 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
+#include "base/object_ptr.h"
+
 class DocumentData;
 
 namespace Ui {
 class GenericBox;
+class GradientButton;
 } // namespace Ui
 
 namespace Window {
@@ -60,3 +63,7 @@ void ShowPremiumPreviewToBuy(
 	Fn<void()> hiddenCallback);
 
 void PremiumUnavailableBox(not_null<Ui::GenericBox*> box);
+
+[[nodiscard]] object_ptr<Ui::GradientButton> CreateUnlockButton(
+	QWidget *parent,
+	rpl::producer<QString> text);

Telegram/SourceFiles/boxes/sticker_set_box.cpp

@@ -15,12 +15,14 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "menu/menu_send.h"
 #include "lang/lang_keys.h"
 #include "ui/boxes/confirm_box.h"
+#include "boxes/premium_preview_box.h"
 #include "core/application.h"
 #include "mtproto/sender.h"
 #include "storage/storage_account.h"
 #include "dialogs/ui/dialogs_layout.h"
 #include "ui/widgets/buttons.h"
 #include "ui/widgets/scroll_area.h"
+#include "ui/widgets/gradient_round_button.h"
 #include "ui/image/image.h"
 #include "ui/image/image_location_factory.h"
 #include "ui/text/text_utilities.h"
@@ -35,6 +37,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "media/clip/media_clip_reader.h"
 #include "window/window_session_controller.h"
 #include "window/window_controller.h"
+#include "settings/settings_premium.h"
 #include "base/unixtime.h"
 #include "main/main_session.h"
 #include "apiwrap.h"
@@ -46,6 +49,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "styles/style_chat_helpers.h"
 #include "styles/style_info.h"
 #include "styles/style_menu_icons.h"
+#include "styles/style_premium.h"
 
 #include <QtWidgets/QApplication>
 #include <QtGui/QClipboard>
@@ -113,9 +117,10 @@ public:
 		not_null<Window::SessionController*> controller,
 		const StickerSetIdentifier &set);
 
-	bool loaded() const;
-	bool notInstalled() const;
-	bool official() const;
+	[[nodiscard]] bool loaded() const;
+	[[nodiscard]] bool notInstalled() const;
+	[[nodiscard]] bool premiumEmojiSet() const;
+	[[nodiscard]] bool official() const;
 	[[nodiscard]] rpl::producer<TextWithEntities> title() const;
 	[[nodiscard]] QString shortName() const;
 	[[nodiscard]] bool isEmojiSet() const;
@@ -379,13 +384,29 @@ void StickerSetBox::updateButtons() {
 					: tr::lng_stickers_copied(tr::now)));
 		};
 		if (_inner->notInstalled()) {
-			auto addText = (type == Data::StickersType::Emoji)
-				? tr::lng_stickers_add_emoji()
-				: (type == Data::StickersType::Masks)
-				? tr::lng_stickers_add_masks()
-				: tr::lng_stickers_add_pack();
-			addButton(std::move(addText), [=] { addStickers(); });
-			addButton(tr::lng_cancel(), [=] { closeBox(); });
+			if (!_controller->session().premium()
+				&& _controller->session().premiumPossible()
+				&& _inner->premiumEmojiSet()) {
+				setStyle(st::premiumPreviewBox);
+				auto button = CreateUnlockButton(
+					this,
+					tr::lng_premium_unlock_emoji());
+				button->resizeToWidth(st::boxWideWidth
+					- st::premiumPreviewBox.buttonPadding.left()
+					- st::premiumPreviewBox.buttonPadding.left());
+				button->setClickedCallback([=] {
+					Settings::ShowPremium(_controller, u"animated_emoji"_q);
+				});
+				addButton(std::move(button));
+			} else {
+				auto addText = (type == Data::StickersType::Emoji)
+					? tr::lng_stickers_add_emoji()
+					: (type == Data::StickersType::Masks)
+					? tr::lng_stickers_add_masks()
+					: tr::lng_stickers_add_pack();
+				addButton(std::move(addText), [=] { addStickers(); });
+				addButton(tr::lng_cancel(), [=] { closeBox(); });
+			}
 
 			if (!_inner->shortName().isEmpty()) {
 				const auto top = addTopButton(st::infoTopBarMenu);
@@ -1119,6 +1140,12 @@ bool StickerSetBox::Inner::loaded() const {
 	return _loaded && !_pack.isEmpty();
 }
 
+bool StickerSetBox::Inner::premiumEmojiSet() const {
+	return (_setFlags & SetFlag::Emoji)
+		&& !_pack.empty()
+		&& _pack.front()->isPremiumEmoji();
+}
+
 bool StickerSetBox::Inner::notInstalled() const {
 	if (!_loaded) {
 		return false;

Telegram/SourceFiles/settings/settings_premium.cpp

@@ -73,6 +73,7 @@ using Order = std::vector<QString>;
 		u"no_ads"_q,
 		u"unique_reactions"_q,
 		u"premium_stickers"_q,
+		u"animated_emoji"_q,
 		u"advanced_chat_management"_q,
 		u"profile_badge"_q,
 		u"animated_userpics"_q,