Allow setting channel wallpaper.

Telegram/Resources/langs/lang.strings

@@ -591,6 +591,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_settings_section_background" = "Chat background";
 "lng_settings_bg_from_gallery" = "Choose from gallery";
 "lng_settings_bg_from_file" = "Choose from file";
+"lng_settings_bg_remove" = "Remove wallpaper";
 "lng_settings_bg_theme_edit" = "Edit theme";
 "lng_settings_bg_theme_create" = "Create new theme";
 "lng_settings_bg_cloud_themes" = "Custom themes";
@@ -838,6 +839,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_background_blur" = "Blurred";
 "lng_background_sure_delete" = "Are you sure you want to delete this background?";
 "lng_background_other_info" = "{user} will be able to apply this wallpaper";
+"lng_background_other_channel" = "All subscribers will see this wallpaper";
 "lng_background_apply1" = "Apply the wallpaper in this chat.";
 "lng_background_apply2" = "Enjoy the view.";
 "lng_background_apply_button" = "Apply For This Chat";
@@ -846,6 +848,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_background_reset_default" = "Reset";
 "lng_background_apply_me" = "Apply for me";
 "lng_background_apply_both" = "Apply for me and {user}";
+"lng_background_apply_channel" = "Apply For Channel";
 
 "lng_download_path_ask" = "Ask download path for each file";
 "lng_download_path" = "Download path";

Telegram/SourceFiles/boxes/background_box.cpp

@@ -129,6 +129,8 @@ private:
 		int row) const;
 	void validatePaperThumbnail(const Paper &paper) const;
 
+	[[nodiscard]] bool forChannel() const;
+
 	const not_null<Main::Session*> _session;
 	PeerData * const _forPeer = nullptr;
 
@@ -176,6 +178,23 @@ void BackgroundBox::prepare() {
 		st::infoIconMediaPhoto,
 		st::infoSharedMediaButtonIconPosition);
 
+	if (forChannel() && _forPeer->wallPaper()) {
+		const auto remove = container->add(object_ptr<Ui::SettingsButton>(
+			container,
+			tr::lng_settings_bg_remove(),
+			st::infoBlockButton));
+		object_ptr<Info::Profile::FloatingIcon>(
+			remove,
+			st::infoIconDeleteRed,
+			st::infoSharedMediaButtonIconPosition);
+
+		remove->setClickedCallback([=] {
+			if (const auto resolved = _inner->resolveResetCustomPaper()) {
+				chosen(*resolved);
+			}
+		});
+	}
+
 	button->setClickedCallback([=] {
 		chooseFromFile();
 	});
@@ -290,6 +309,23 @@ void BackgroundBox::chosen(const Data::WallPaper &paper) {
 			closeBox();
 		}
 		return;
+	} else if (forChannel()) {
+		if (_forPeer->wallPaper() && _forPeer->wallPaper()->equals(paper)) {
+			closeBox();
+			return;
+		}
+		const auto &themes = _forPeer->owner().cloudThemes();
+		for (const auto &theme : themes.chatThemes()) {
+			for (const auto &[type, themed] : theme.settings) {
+				if (themed.paper && themed.paper->equals(paper)) {
+					_controller->show(Box<BackgroundPreviewBox>(
+						_controller,
+						Data::WallPaper::FromEmojiId(theme.emoticon),
+						BackgroundPreviewArgs{ _forPeer }));
+					return;
+				}
+			}
+		}
 	}
 	_controller->show(Box<BackgroundPreviewBox>(
 		_controller,
@@ -316,6 +352,10 @@ void BackgroundBox::resetForPeer() {
 	}
 }
 
+bool BackgroundBox::forChannel() const {
+	return _forPeer && _forPeer->isChannel();
+}
+
 void BackgroundBox::removePaper(const Data::WallPaper &paper) {
 	const auto session = &_controller->session();
 	const auto remove = [=, weak = Ui::MakeWeak(this)](Fn<void()> &&close) {
@@ -345,9 +385,16 @@ BackgroundBox::Inner::Inner(
 , _session(session)
 , _forPeer(forPeer)
 , _api(&_session->mtp())
-, _check(std::make_unique<Ui::RoundCheckbox>(st::overviewCheck, [=] { update(); })) {
+, _check(
+	std::make_unique<Ui::RoundCheckbox>(
+		st::overviewCheck,
+		[=] { update(); })) {
 	_check->setChecked(true, anim::type::instant);
-	resize(st::boxWideWidth, 2 * (st::backgroundSize.height() + st::backgroundPadding) + st::backgroundPadding);
+	resize(
+		st::boxWideWidth,
+		(2 * (st::backgroundSize.height() + st::backgroundPadding)
+			+ st::backgroundPadding));
+
 	Window::Theme::IsNightModeValue(
 	) | rpl::start_with_next([=] {
 		updatePapers();
@@ -364,21 +411,31 @@ BackgroundBox::Inner::Inner(
 		_check->invalidateCache();
 	}, lifetime());
 
-	using Update = Window::Theme::BackgroundUpdate;
-	Window::Theme::Background()->updates(
-	) | rpl::start_with_next([=](const Update &update) {
-		if (update.type == Update::Type::New) {
-			sortPapers();
-			requestPapers();
-			this->update();
-		}
-	}, lifetime());
-
+	if (forChannel()) {
+		_session->data().cloudThemes().chatThemesUpdated(
+		) | rpl::start_with_next([=] {
+			updatePapers();
+		}, lifetime());
+	} else {
+		using Update = Window::Theme::BackgroundUpdate;
+		Window::Theme::Background()->updates(
+		) | rpl::start_with_next([=](const Update &update) {
+			if (update.type == Update::Type::New) {
+				sortPapers();
+				requestPapers();
+				this->update();
+			}
+		}, lifetime());
+	}
 
 	setMouseTracking(true);
 }
 
 void BackgroundBox::Inner::requestPapers() {
+	if (forChannel()) {
+		_session->data().cloudThemes().refreshChatThemes();
+		return;
+	}
 	_api.request(MTPaccount_GetWallPapers(
 		MTP_long(_session->data().wallpapersHash())
 	)).done([=](const MTPaccount_WallPapers &result) {
@@ -395,7 +452,7 @@ auto BackgroundBox::Inner::resolveResetCustomPaper() const
 	}
 	const auto nonCustom = Window::Theme::Background()->paper();
 	const auto themeEmoji = _forPeer->themeEmoji();
-	if (themeEmoji.isEmpty()) {
+	if (forChannel() || themeEmoji.isEmpty()) {
 		return nonCustom;
 	}
 	const auto &themes = _forPeer->owner().cloudThemes();
@@ -443,6 +500,8 @@ void BackgroundBox::Inner::pushCustomPapers() {
 }
 
 void BackgroundBox::Inner::sortPapers() {
+	Expects(!forChannel());
+
 	const auto currentCustom = _forPeer ? _forPeer->wallPaper() : nullptr;
 	_currentId = currentCustom
 		? currentCustom->id()
@@ -472,23 +531,60 @@ void BackgroundBox::Inner::sortPapers() {
 }
 
 void BackgroundBox::Inner::updatePapers() {
-	if (_session->data().wallpapers().empty()) {
-		return;
+	if (forChannel()) {
+		if (_session->data().cloudThemes().chatThemes().empty()) {
+			return;
+		}
+	} else {
+		if (_session->data().wallpapers().empty()) {
+			return;
+		}
 	}
 	_over = _overDown = Selection();
 
-	_papers = _session->data().wallpapers(
-	) | ranges::views::filter([&](const Data::WallPaper &paper) {
-		return (!paper.isPattern() || !paper.backgroundColors().empty())
-			&& (!_forPeer
-				|| (!Data::IsDefaultWallPaper(paper)
-					&& (Data::IsCloudWallPaper(paper)
-						|| Data::IsCustomWallPaper(paper))));
-	}) | ranges::views::transform([](const Data::WallPaper &paper) {
-		return Paper{ paper };
-	}) | ranges::to_vector;
-	pushCustomPapers();
-	sortPapers();
+	const auto was = base::take(_papers);
+	if (forChannel()) {
+		const auto now = _forPeer->wallPaper();
+		const auto &list = _session->data().cloudThemes().chatThemes();
+		if (list.empty()) {
+			return;
+		}
+		using Type = Data::CloudThemeType;
+		const auto type = Window::Theme::IsNightMode()
+			? Type::Dark
+			: Type::Light;
+		_papers.reserve(list.size() + 1);
+		const auto nowEmojiId = now ? now->emojiId() : QString();
+		if (!now || !now->emojiId().isEmpty()) {
+			_papers.push_back({ Window::Theme::Background()->paper() });
+			_currentId = _papers.back().data.id();
+		} else {
+			_papers.push_back({ *now });
+			_currentId = now->id();
+		}
+		for (const auto &theme : list) {
+			const auto i = theme.settings.find(type);
+			if (i != end(theme.settings) && i->second.paper) {
+				_papers.push_back({ *i->second.paper });
+				if (nowEmojiId == theme.emoticon) {
+					_currentId = _papers.back().data.id();
+				}
+			}
+		}
+	} else {
+		_papers = _session->data().wallpapers(
+		) | ranges::views::filter([&](const Data::WallPaper &paper) {
+			return (!paper.isPattern() || !paper.backgroundColors().empty())
+				&& (!_forPeer
+					|| (!Data::IsDefaultWallPaper(paper)
+						&& (Data::IsCloudWallPaper(paper)
+							|| Data::IsCustomWallPaper(paper))));
+		}) | ranges::views::transform([](const Data::WallPaper &paper) {
+			return Paper{ paper };
+		}) | ranges::to_vector;
+		pushCustomPapers();
+		sortPapers();
+	}
 	resizeToContentAndPreload();
 }
 
@@ -587,6 +683,10 @@ void BackgroundBox::Inner::validatePaperThumbnail(
 	paper.thumbnail.setDevicePixelRatio(cRetinaFactor());
 }
 
+bool BackgroundBox::Inner::forChannel() const {
+	return _forPeer && _forPeer->isChannel();
+}
+
 void BackgroundBox::Inner::paintPaper(
 		QPainter &p,
 		const Paper &paper,
@@ -604,7 +704,8 @@ void BackgroundBox::Inner::paintPaper(
 		const auto checkLeft = x + st::backgroundSize.width() - st::overviewCheckSkip - st::overviewCheck.size;
 		const auto checkTop = y + st::backgroundSize.height() - st::overviewCheckSkip - st::overviewCheck.size;
 		_check->paint(p, checkLeft, checkTop, width());
-	} else if (Data::IsCloudWallPaper(paper.data)
+	} else if (!forChannel()
+		&& Data::IsCloudWallPaper(paper.data)
 		&& !Data::IsDefaultWallPaper(paper.data)
 		&& !Data::IsLegacy2DefaultWallPaper(paper.data)
 		&& !Data::IsLegacy3DefaultWallPaper(paper.data)
@@ -642,7 +743,8 @@ void BackgroundBox::Inner::mouseMoveEvent(QMouseEvent *e) {
 			- st::stickerPanDeleteIconBg.width();
 		const auto deleteBottom = row * (height + skip) + skip
 			+ st::stickerPanDeleteIconBg.height();
-		const auto inDelete = (x >= deleteLeft)
+		const auto inDelete = !forChannel()
+			&& (x >= deleteLeft)
 			&& (y < deleteBottom)
 			&& Data::IsCloudWallPaper(data)
 			&& !Data::IsDefaultWallPaper(data)

Telegram/SourceFiles/boxes/background_box.h

@@ -38,6 +38,7 @@ private:
 		const Data::WallPaper &paper) const;
 	void removePaper(const Data::WallPaper &paper);
 	void resetForPeer();
+	[[nodiscard]] bool forChannel() const;
 
 	void chooseFromFile();
 

Telegram/SourceFiles/boxes/background_preview_box.cpp

@@ -8,11 +8,13 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "boxes/background_preview_box.h"
 
 #include "base/unixtime.h"
+#include "boxes/peers/edit_peer_color_box.h"
 #include "boxes/premium_preview_box.h"
 #include "lang/lang_keys.h"
 #include "mainwidget.h"
 #include "window/themes/window_theme.h"
 #include "ui/boxes/confirm_box.h"
+#include "ui/boxes/boost_box.h"
 #include "ui/controls/chat_service_checkbox.h"
 #include "ui/chat/chat_theme.h"
 #include "ui/chat/chat_style.h"
@@ -29,6 +31,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history_item.h"
 #include "history/history_item_helpers.h"
 #include "history/view/history_view_message.h"
+#include "main/main_account.h"
+#include "main/main_app_config.h"
 #include "main/main_session.h"
 #include "apiwrap.h"
 #include "data/data_session.h"
@@ -159,6 +163,25 @@ constexpr auto kDefaultDimming = 50;
 	return result;
 }
 
+[[nodiscard]] Data::WallPaper Resolve(
+		not_null<Main::Session*> session,
+		const Data::WallPaper &paper,
+		bool dark) {
+	if (paper.emojiId().isEmpty()) {
+		return paper;
+	}
+	const auto &themes = session->data().cloudThemes();
+	if (const auto theme = themes.themeForEmoji(paper.emojiId())) {
+		using Type = Data::CloudThemeType;
+		const auto type = dark ? Type::Dark : Type::Light;
+		const auto i = theme->settings.find(type);
+		if (i != end(theme->settings) && i->second.paper) {
+			return *i->second.paper;
+		}
+	}
+	return paper;
+}
+
 } // namespace
 
 struct BackgroundPreviewBox::OverridenStyle {
@@ -196,15 +219,17 @@ BackgroundPreviewBox::BackgroundPreviewBox(
 		? tr::lng_background_apply2(tr::now)
 		: tr::lng_background_text2(tr::now)),
 	true))
-, _paper(paper)
+, _paperEmojiId(paper.emojiId())
+, _paper(
+	Resolve(&controller->session(), paper, Window::Theme::IsNightMode()))
 , _media(_paper.document() ? _paper.document()->createMediaView() : nullptr)
 , _radial([=](crl::time now) { radialAnimationCallback(now); })
 , _appNightMode(Window::Theme::IsNightModeValue())
 , _boxDarkMode(_appNightMode.current())
-, _dimmingIntensity(std::clamp(paper.patternIntensity(), 0, 100))
+, _dimmingIntensity(std::clamp(_paper.patternIntensity(), 0, 100))
 , _dimmed(_forPeer
-	&& (paper.document() || paper.localThumbnail())
-	&& !paper.isPattern()) {
+	&& (_paper.document() || _paper.localThumbnail())
+	&& !_paper.isPattern()) {
 	if (_media) {
 		_media->thumbnailWanted(_paper.fileOrigin());
 	}
@@ -244,7 +269,36 @@ BackgroundPreviewBox::BackgroundPreviewBox(
 
 BackgroundPreviewBox::~BackgroundPreviewBox() = default;
 
+void BackgroundPreviewBox::recreate(bool dark) {
+	_paper = Resolve(
+		&_controller->session(),
+		Data::WallPaper::FromEmojiId(_paperEmojiId),
+		dark);
+	_media = _paper.document()
+		? _paper.document()->createMediaView()
+		: nullptr;
+	if (_media) {
+		_media->thumbnailWanted(_paper.fileOrigin());
+	}
+	_full = QImage();
+	_generated = _scaled = _blurred = _fadeOutThumbnail = QPixmap();
+	_generating = {};
+	generateBackground();
+	_paper.loadDocument();
+	if (const auto document = _paper.document()) {
+		if (document->loading()) {
+			_radial.start(_media->progress());
+		}
+	}
+	checkLoadedDocument();
+	updateServiceBg(_paper.backgroundColors());
+	update();
+}
+
 void BackgroundPreviewBox::applyDarkMode(bool dark) {
+	if (!_paperEmojiId.isEmpty()) {
+		recreate(dark);
+	}
 	const auto equals = (dark == Window::Theme::IsNightMode());
 	const auto &palette = (dark ? _darkPalette : _lightPalette);
 	if (!equals && !palette) {
@@ -410,6 +464,10 @@ auto BackgroundPreviewBox::prepareOverridenStyle(bool dark)
 	return result;
 }
 
+bool BackgroundPreviewBox::forChannel() const {
+	return _forPeer && _forPeer->isChannel();
+}
+
 void BackgroundPreviewBox::generateBackground() {
 	if (_paper.backgroundColors().empty()) {
 		return;
@@ -435,7 +493,9 @@ void BackgroundPreviewBox::resetTitle() {
 
 void BackgroundPreviewBox::rebuildButtons(bool dark) {
 	clearButtons();
-	addButton(_forPeer
+	addButton(forChannel()
+		? tr::lng_background_apply_channel()
+		: _forPeer
 		? tr::lng_background_apply_button()
 		: tr::lng_settings_apply(), [=] { apply(); });
 	addButton(tr::lng_cancel(), [=] { closeBox(); });
@@ -624,6 +684,36 @@ void BackgroundPreviewBox::setExistingForPeer(
 	_controller->finishChatThemeEdit(_forPeer);
 }
 
+void BackgroundPreviewBox::checkLevelForChannel() {
+	Expects(forChannel());
+
+	const auto show = _controller->uiShow();
+	_forPeerLevelCheck = true;
+	const auto weak = Ui::MakeWeak(this);
+	CheckBoostLevel(show, _forPeer, [=](int level) {
+		if (!weak) {
+			return std::optional<Ui::AskBoostReason>();
+		}
+		const auto appConfig = &_forPeer->session().account().appConfig();
+		const auto defaultRequired = appConfig->get<int>(
+			"channel_wallpaper_level_min",
+			9);
+		const auto customRequired = appConfig->get<int>(
+			"channel_custom_wallpaper_level_min",
+			10);
+		const auto required = _paperEmojiId.isEmpty()
+			? customRequired
+			: defaultRequired;
+		if (level >= required) {
+			applyForPeer(false);
+			return std::optional<Ui::AskBoostReason>();
+		}
+		return std::make_optional(Ui::AskBoostReason{
+			Ui::AskBoostWallpaper{ required }
+		});
+	}, [=] { _forPeerLevelCheck = false; });
+}
+
 void BackgroundPreviewBox::applyForPeer() {
 	Expects(_forPeer != nullptr);
 
@@ -636,105 +726,110 @@ void BackgroundPreviewBox::applyForPeer() {
 		}
 	}
 
-	if (!_fromMessageId && _forPeer->session().premiumPossible()) {
-		if (_forBothOverlay) {
-			return;
-		}
-		const auto size = this->size() * style::DevicePixelRatio();
-		const auto bg = Images::DitherImage(
-			Images::BlurLargeImage(
-				Ui::GrabWidgetToImage(this).scaled(
-					size / style::ConvertScale(4),
-					Qt::IgnoreAspectRatio,
-					Qt::SmoothTransformation),
-				24).scaled(
-					size,
-					Qt::IgnoreAspectRatio,
-					Qt::SmoothTransformation));
-
-		_forBothOverlay = std::make_unique<Ui::FadeWrap<>>(
-			this,
-			object_ptr<Ui::RpWidget>(this));
-		const auto overlay = _forBothOverlay->entity();
-
-		sizeValue() | rpl::start_with_next([=](QSize size) {
-			_forBothOverlay->setGeometry({ QPoint(), size });
-			overlay->setGeometry({ QPoint(), size });
-		}, _forBothOverlay->lifetime());
-
-		overlay->paintRequest(
-		) | rpl::start_with_next([=](QRect clip) {
-			auto p = QPainter(overlay);
-			p.drawImage(0, 0, bg);
-			p.fillRect(clip, QColor(0, 0, 0, 64));
-		}, overlay->lifetime());
-
-		using namespace Ui;
-		const auto forMe = CreateChild<RoundButton>(
-			overlay,
-			tr::lng_background_apply_me(),
-			st::backgroundConfirm);
-		forMe->setClickedCallback([=] {
-			applyForPeer(false);
-		});
-		using namespace rpl::mappers;
-		const auto forBoth = ::Settings::CreateLockedButton(
-			overlay,
-			tr::lng_background_apply_both(
-				lt_user,
-				rpl::single(_forPeer->shortName())),
-			st::backgroundConfirm,
-			Data::AmPremiumValue(&_forPeer->session()) | rpl::map(!_1));
-		forBoth->setClickedCallback([=] {
-			if (_forPeer->session().premium()) {
-				applyForPeer(true);
-			} else {
-				ShowPremiumPreviewBox(
-					_controller->uiShow(),
-					PremiumPreview::Wallpapers);
-			}
-		});
-		const auto cancel = CreateChild<RoundButton>(
-			overlay,
-			tr::lng_cancel(),
-			st::backgroundConfirmCancel);
-		cancel->setClickedCallback([=] {
-			const auto raw = _forBothOverlay.release();
-			raw->shownValue() | rpl::filter(
-				!rpl::mappers::_1
-			) | rpl::take(1) | rpl::start_with_next(crl::guard(raw, [=] {
-				delete raw;
-			}), raw->lifetime());
-			raw->toggle(false, anim::type::normal);
-		});
-		forMe->setTextTransform(RoundButton::TextTransform::NoTransform);
-		forBoth->setTextTransform(RoundButton::TextTransform::NoTransform);
-		cancel->setTextTransform(RoundButton::TextTransform::NoTransform);
-
-		overlay->sizeValue(
-		) | rpl::start_with_next([=](QSize size) {
-			const auto padding = st::backgroundConfirmPadding;
-			const auto width = size.width()
-				- padding.left()
-				- padding.right();
-			const auto height = cancel->height();
-			auto top = size.height() - padding.bottom() - height;
-			cancel->setGeometry(padding.left(), top, width, height);
-			top -= height + padding.top();
-			forBoth->setGeometry(padding.left(), top, width, height);
-			top -= height + padding.top();
-			forMe->setGeometry(padding.left(), top, width, height);
-		}, _forBothOverlay->lifetime());
-
-		_forBothOverlay->hide(anim::type::instant);
-		_forBothOverlay->show(anim::type::normal);
-	} else {
+	if (forChannel()) {
+		checkLevelForChannel();
+		return;
+	} else if (_fromMessageId || !_forPeer->session().premiumPossible()) {
 		applyForPeer(false);
+		return;
+	} else if (_forBothOverlay) {
+		return;
 	}
+	const auto size = this->size() * style::DevicePixelRatio();
+	const auto bg = Images::DitherImage(
+		Images::BlurLargeImage(
+			Ui::GrabWidgetToImage(this).scaled(
+				size / style::ConvertScale(4),
+				Qt::IgnoreAspectRatio,
+				Qt::SmoothTransformation),
+			24).scaled(
+				size,
+				Qt::IgnoreAspectRatio,
+				Qt::SmoothTransformation));
+
+	_forBothOverlay = std::make_unique<Ui::FadeWrap<>>(
+		this,
+		object_ptr<Ui::RpWidget>(this));
+	const auto overlay = _forBothOverlay->entity();
+
+	sizeValue() | rpl::start_with_next([=](QSize size) {
+		_forBothOverlay->setGeometry({ QPoint(), size });
+		overlay->setGeometry({ QPoint(), size });
+	}, _forBothOverlay->lifetime());
+
+	overlay->paintRequest(
+	) | rpl::start_with_next([=](QRect clip) {
+		auto p = QPainter(overlay);
+		p.drawImage(0, 0, bg);
+		p.fillRect(clip, QColor(0, 0, 0, 64));
+	}, overlay->lifetime());
+
+	using namespace Ui;
+	const auto forMe = CreateChild<RoundButton>(
+		overlay,
+		tr::lng_background_apply_me(),
+		st::backgroundConfirm);
+	forMe->setClickedCallback([=] {
+		applyForPeer(false);
+	});
+	using namespace rpl::mappers;
+	const auto forBoth = ::Settings::CreateLockedButton(
+		overlay,
+		tr::lng_background_apply_both(
+			lt_user,
+			rpl::single(_forPeer->shortName())),
+		st::backgroundConfirm,
+		Data::AmPremiumValue(&_forPeer->session()) | rpl::map(!_1));
+	forBoth->setClickedCallback([=] {
+		if (_forPeer->session().premium()) {
+			applyForPeer(true);
+		} else {
+			ShowPremiumPreviewBox(
+				_controller->uiShow(),
+				PremiumPreview::Wallpapers);
+		}
+	});
+	const auto cancel = CreateChild<RoundButton>(
+		overlay,
+		tr::lng_cancel(),
+		st::backgroundConfirmCancel);
+	cancel->setClickedCallback([=] {
+		const auto raw = _forBothOverlay.release();
+		raw->shownValue() | rpl::filter(
+			!rpl::mappers::_1
+		) | rpl::take(1) | rpl::start_with_next(crl::guard(raw, [=] {
+			delete raw;
+		}), raw->lifetime());
+		raw->toggle(false, anim::type::normal);
+	});
+	forMe->setTextTransform(RoundButton::TextTransform::NoTransform);
+	forBoth->setTextTransform(RoundButton::TextTransform::NoTransform);
+	cancel->setTextTransform(RoundButton::TextTransform::NoTransform);
+
+	overlay->sizeValue(
+	) | rpl::start_with_next([=](QSize size) {
+		const auto padding = st::backgroundConfirmPadding;
+		const auto width = size.width()
+			- padding.left()
+			- padding.right();
+		const auto height = cancel->height();
+		auto top = size.height() - padding.bottom() - height;
+		cancel->setGeometry(padding.left(), top, width, height);
+		top -= height + padding.top();
+		forBoth->setGeometry(padding.left(), top, width, height);
+		top -= height + padding.top();
+		forMe->setGeometry(padding.left(), top, width, height);
+	}, _forBothOverlay->lifetime());
+
+	_forBothOverlay->hide(anim::type::instant);
+	_forBothOverlay->show(anim::type::normal);
 }
 
 void BackgroundPreviewBox::applyForPeer(bool both) {
-	if (Data::IsCustomWallPaper(_paper)) {
+	using namespace Data;
+	if (forChannel() && !_paperEmojiId.isEmpty()) {
+		setExistingForPeer(WallPaper::FromEmojiId(_paperEmojiId), both);
+	} else if (IsCustomWallPaper(_paper)) {
 		uploadForPeer(both);
 	} else {
 		setExistingForPeer(_paper, both);
@@ -855,7 +950,7 @@ int BackgroundPreviewBox::textsTop() const {
 		- st::historyPaddingBottom
 		- (_service ? _service->height() : 0)
 		- _text1->height()
-		- _text2->height();
+		- (forChannel() ? _text2->height() : 0);
 }
 
 QRect BackgroundPreviewBox::radialRect() const {
@@ -885,10 +980,11 @@ void BackgroundPreviewBox::paintTexts(Painter &p, crl::time ms) {
 	context.outbg = _text1->hasOutLayout();
 	_text1->draw(p, context);
 	p.translate(0, height1);
-
-	context.outbg = _text2->hasOutLayout();
-	_text2->draw(p, context);
-	p.translate(0, height2);
+	if (!forChannel()) {
+		context.outbg = _text2->hasOutLayout();
+		_text2->draw(p, context);
+		p.translate(0, height2);
+	}
 }
 
 void BackgroundPreviewBox::radialAnimationCallback(crl::time now) {
@@ -988,7 +1084,9 @@ void BackgroundPreviewBox::updateServiceBg(const std::vector<QColor> &bg) {
 	_service = GenerateServiceItem(
 		delegate(),
 		_serviceHistory,
-		((_forPeer && !_fromMessageId)
+		(forChannel()
+			? tr::lng_background_other_channel(tr::now)
+			: (_forPeer && !_fromMessageId)
 			? tr::lng_background_other_info(
 				tr::now,
 				lt_user,

Telegram/SourceFiles/boxes/background_preview_box.h

@@ -94,18 +94,24 @@ private:
 	void applyDarkMode(bool dark);
 	[[nodiscard]] OverridenStyle prepareOverridenStyle(bool dark);
 
+	[[nodiscard]] bool forChannel() const;
+	void checkLevelForChannel();
+
+	void recreate(bool dark);
 	void resetTitle();
 	void rebuildButtons(bool dark);
 	void createDimmingSlider(bool dark);
 
 	const not_null<Window::SessionController*> _controller;
 	PeerData * const _forPeer = nullptr;
+	bool _forPeerLevelCheck = false;
 	FullMsgId _fromMessageId;
 	std::unique_ptr<Ui::ChatStyle> _chatStyle;
 	const not_null<History*> _serviceHistory;
 	AdminLog::OwnedItem _service;
 	AdminLog::OwnedItem _text1;
 	AdminLog::OwnedItem _text2;
+	QString _paperEmojiId;
 	Data::WallPaper _paper;
 	std::shared_ptr<Data::DocumentMedia> _media;
 	QImage _full;

Telegram/SourceFiles/boxes/peers/edit_peer_color_box.cpp

@@ -12,6 +12,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "api/api_peer_photo.h"
 #include "base/unixtime.h"
 #include "boxes/peers/replace_boost_box.h"
+#include "boxes/background_box.h"
 #include "chat_helpers/compose/compose_show.h"
 #include "data/data_changes.h"
 #include "data/data_channel.h"
@@ -524,13 +525,7 @@ void Apply(
 		Set(show, peer, values);
 		close();
 	} else {
-		session->api().request(MTPpremium_GetBoostsStatus(
-			peer->input
-		)).done([=](const MTPpremium_BoostsStatus &result) {
-			const auto &data = result.data();
-			if (const auto channel = peer->asChannel()) {
-				channel->updateLevelHint(data.vlevel().v);
-			}
+		CheckBoostLevel(show, peer, [=](int level) {
 			const auto peerColors = &peer->session().api().peerColors();
 			const auto colorRequired = peerColors->requiredLevelFor(
 				peer->id,
@@ -551,38 +546,21 @@ void Apply(
 				iconRequired,
 				statusRequired,
 			});
-			const auto current = data.vlevel().v;
-			if (current >= required) {
+			if (level >= required) {
 				Set(show, peer, values);
 				close();
-				return;
+				return std::optional<Ui::AskBoostReason>();
 			}
-			const auto openStatistics = [=] {
-				if (const auto controller = show->resolveWindow(
-						ChatHelpers::WindowUsage::PremiumPromo)) {
-					controller->showSection(Info::Boosts::Make(peer));
-				}
-			};
-			auto counters = ParseBoostCounters(result);
-			counters.mine = 0; // Don't show current level as just-reached.
 			const auto reason = [&]() -> Ui::AskBoostReason {
-				if (current < statusRequired) {
+				if (level < statusRequired) {
 					return { Ui::AskBoostEmojiStatus{ statusRequired } };
-				} else if (current < iconRequired) {
+				} else if (level < iconRequired) {
 					return { Ui::AskBoostChannelColor{ iconRequired } };
 				}
 				return { Ui::AskBoostChannelColor{ colorRequired } };
 			}();
-			show->show(Box(Ui::AskBoostBox, Ui::AskBoostBoxData{
-				.link = qs(data.vboost_url()),
-				.boost = counters,
-				.reason = reason,
-			}, openStatistics, nullptr));
-			cancel();
-		}).fail([=](const MTP::Error &error) {
-			show->showToast(error.type());
-			cancel();
-		}).send();
+			return std::make_optional(reason);
+		}, cancel);
 	}
 }
 
@@ -978,6 +956,23 @@ void EditPeerColorBox(
 		: tr::lng_settings_color_emoji_about_channel());
 
 	if (const auto channel = peer->asChannel()) {
+		Ui::AddSkip(container, st::settingsColorSampleSkip);
+		container->add(object_ptr<Ui::SettingsButton>(
+			container,
+			tr::lng_edit_channel_wallpaper(),
+			st::settingsButtonNoIcon)
+		)->setClickedCallback([=] {
+			const auto usage = ChatHelpers::WindowUsage::PremiumPromo;
+			if (const auto strong = show->resolveWindow(usage)) {
+				show->show(Box<BackgroundBox>(strong, channel));
+			}
+		});
+
+		Ui::AddSkip(container, st::settingsColorSampleSkip);
+		Ui::AddDividerText(
+			container,
+			tr::lng_edit_channel_wallpaper_about());
+
 		// Preload exceptions list.
 		const auto peerPhoto = &channel->session().api().peerPhoto();
 		[[maybe_unused]] auto list = peerPhoto->emojiListValue(
@@ -1110,3 +1105,39 @@ void AddPeerColorButton(
 		show->show(Box(EditPeerColorBox, show, peer, style, theme));
 	});
 }
+
+void CheckBoostLevel(
+		std::shared_ptr<ChatHelpers::Show> show,
+		not_null<PeerData*> peer,
+		Fn<std::optional<Ui::AskBoostReason>(int level)> askMore,
+		Fn<void()> cancel) {
+	peer->session().api().request(MTPpremium_GetBoostsStatus(
+		peer->input
+	)).done([=](const MTPpremium_BoostsStatus &result) {
+		const auto &data = result.data();
+		if (const auto channel = peer->asChannel()) {
+			channel->updateLevelHint(data.vlevel().v);
+		}
+		const auto reason = askMore(data.vlevel().v);
+		if (!reason) {
+			return;
+		}
+		const auto openStatistics = [=] {
+			if (const auto controller = show->resolveWindow(
+					ChatHelpers::WindowUsage::PremiumPromo)) {
+				controller->showSection(Info::Boosts::Make(peer));
+			}
+		};
+		auto counters = ParseBoostCounters(result);
+		counters.mine = 0; // Don't show current level as just-reached.
+		show->show(Box(Ui::AskBoostBox, Ui::AskBoostBoxData{
+			.link = qs(data.vboost_url()),
+			.boost = counters,
+			.reason = *reason,
+		}, openStatistics, nullptr));
+		cancel();
+	}).fail([=](const MTP::Error &error) {
+		show->showToast(error.type());
+		cancel();
+	}).send();
+}

Telegram/SourceFiles/boxes/peers/edit_peer_color_box.h

@@ -16,6 +16,7 @@ class GenericBox;
 class ChatStyle;
 class ChatTheme;
 class VerticalLayout;
+struct AskBoostReason;
 } // namespace Ui
 
 void EditPeerColorBox(
@@ -29,3 +30,9 @@ void AddPeerColorButton(
 	not_null<Ui::VerticalLayout*> container,
 	std::shared_ptr<ChatHelpers::Show> show,
 	not_null<PeerData*> peer);
+
+void CheckBoostLevel(
+	std::shared_ptr<ChatHelpers::Show> show,
+	not_null<PeerData*> peer,
+	Fn<std::optional<Ui::AskBoostReason>(int level)> askMore,
+	Fn<void()> cancel);

Telegram/SourceFiles/data/data_wall_paper.cpp

@@ -698,6 +698,12 @@ std::optional<WallPaper> WallPaper::FromColorsSlug(const QString &slug) {
 	return result;
 }
 
+WallPaper WallPaper::FromEmojiId(const QString &emojiId) {
+	auto result = WallPaper(0);
+	result._emojiId = emojiId;
+	return result;
+}
+
 WallPaper WallPaper::ConstructDefault() {
 	auto result = WallPaper(
 		kDefaultBackground

Telegram/SourceFiles/data/data_wall_paper.h

@@ -103,6 +103,7 @@ public:
 		qint32 legacyId);
 	[[nodiscard]] static std::optional<WallPaper> FromColorsSlug(
 		const QString &slug);
+	[[nodiscard]] static WallPaper FromEmojiId(const QString &emojiId);
 	[[nodiscard]] static WallPaper ConstructDefault();
 
 private:

Telegram/SourceFiles/info/info.style

@@ -404,6 +404,7 @@ infoIconMediaStoriesRecent: icon {{ "info/info_stories_recent", infoIconFg }};
 infoIconShare: icon {{ "info/info_share", infoIconFg }};
 infoIconEdit: icon {{ "info/info_edit", infoIconFg }};
 infoIconDelete: icon {{ "info/info_delete", infoIconFg }};
+infoIconDeleteRed: icon {{ "info/info_delete", attentionButtonFg }};
 infoIconReport: icon {{ "info/info_report", attentionButtonFg }};
 infoIconLeave: icon {{ "info/info_leave", infoIconFg }};
 infoIconBlock: icon {{ "info/info_block", attentionButtonFg }};