Allow unlinking the discussion group.

Telegram/Resources/langs/lang.strings

@@ -847,7 +847,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_manage_discussion_group" = "Discussion";
 "lng_manage_discussion_group_add" = "Add a group";
 "lng_manage_linked_channel" = "Linked channel";
-"lng_manage_linked_channel_set" = "Set";
+"lng_manage_linked_channel_restore" = "Restore linked channel";
 "lng_manage_discussion_group_about" = "Select a group chat for discussion that will be displayed in your channel.";
 "lng_manage_discussion_group_about_chosen" = "A link to {group} is shown to all subscribers in the bottom panel.";
 "lng_manage_discussion_group_create" = "Create a new group";

Telegram/SourceFiles/boxes/peers/edit_linked_chat_box.cpp

@@ -11,8 +11,11 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_channel.h"
 #include "ui/widgets/labels.h"
 #include "ui/wrap/vertical_layout.h"
+#include "info/profile/info_profile_button.h"
+#include "info/profile/info_profile_values.h"
 #include "boxes/peer_list_box.h"
 #include "styles/style_boxes.h"
+#include "styles/style_info.h"
 
 namespace {
 
@@ -23,6 +26,145 @@ TextWithEntities BoldText(const QString &text) {
 	return result;
 }
 
+class ListController
+	: public PeerListController
+	, public PeerListContentDelegate {
+public:
+	ListController(Fn<void(not_null<ChannelData*>)> callback)
+	: _callback(std::move(callback)) {
+	}
+	void prepare() override {
+	}
+	void rowClicked(not_null<PeerListRow*> row) override {
+		const auto onstack = _callback;
+		onstack(row->peer()->asChannel());
+	}
+	void peerListSetTitle(Fn<QString()> title) override {
+	}
+	void peerListSetAdditionalTitle(Fn<QString()> title) override {
+	}
+	bool peerListIsRowSelected(not_null<PeerData*> peer) override {
+		return false;
+	}
+	int peerListSelectedRowsCount() override {
+		return 0;
+	}
+	auto peerListCollectSelectedRows()
+		-> std::vector<not_null<PeerData*>> override {
+		return {};
+	}
+	void peerListScrollToTop() override {
+	}
+	void peerListAddSelectedRowInBunch(
+		not_null<PeerData*> peer) override {
+	}
+	void peerListFinishSelectedRowsBunch() override {
+	}
+	void peerListSetDescription(
+		object_ptr<Ui::FlatLabel> description) override {
+	}
+
+private:
+	Fn<void(not_null<ChannelData*>)> _callback;
+
+};
+
+object_ptr<Ui::RpWidget> SetupList(
+		not_null<QWidget*> parent,
+		not_null<ChannelData*> channel,
+		ChannelData *chat,
+		const std::vector<not_null<ChannelData*>> &chats,
+		Fn<void(ChannelData*)> callback) {
+	const auto already = (chat != nullptr);
+	const auto selected = [=](not_null<ChannelData*> chat) {
+		if (already) {
+			Ui::showPeerHistory(chat, ShowAtUnreadMsgId);
+		} else {
+			callback(chat);
+		}
+	};
+	const auto controller = Ui::CreateChild<ListController>(
+		parent.get(),
+		selected);
+	controller->setDelegate(controller);
+	auto list = object_ptr<PeerListContent>(
+		parent,
+		controller,
+		st::peerListBox);
+	const auto createRow = [](not_null<ChannelData*> chat) {
+		auto result = std::make_unique<PeerListRow>(chat);
+		result->setCustomStatus(chat->isPublic()
+			? ('@' + chat->username)
+			: lang(lng_manage_discussion_group_private));
+		return result;
+	};
+	if (chat) {
+		list->appendRow(createRow(chat));
+	} else {
+		for (const auto chat : chats) {
+			list->appendRow(createRow(chat));
+		}
+	}
+	return std::move(list);
+}
+
+object_ptr<Ui::RpWidget> SetupAbout(
+		not_null<QWidget*> parent,
+		not_null<ChannelData*> channel,
+		ChannelData *chat) {
+	auto about = object_ptr<Ui::FlatLabel>(
+		parent,
+		QString(),
+		Ui::FlatLabel::InitType::Simple,
+		st::linkedChatAbout);
+	about->setMarkedText([&]() -> TextWithEntities {
+		if (!channel->isBroadcast()) {
+			return lng_manage_linked_channel_about__generic<
+				TextWithEntities
+			>(lt_channel, BoldText(chat->name));
+		} else if (chat != nullptr) {
+			return lng_manage_discussion_group_about_chosen__generic<
+				TextWithEntities
+			>(lt_group, BoldText(chat->name));
+		} else {
+			return { lang(lng_manage_discussion_group_about) };
+		}
+	}());
+	return std::move(about);
+}
+
+object_ptr<Ui::RpWidget> SetupCreateGroup(
+		not_null<QWidget*> parent,
+		not_null<ChannelData*> channel) {
+	auto result = object_ptr<Info::Profile::Button>(
+		parent,
+		Lang::Viewer(
+			lng_manage_discussion_group_create
+		) | Info::Profile::ToUpperValue(),
+		st::infoCreateLinkedChatButton);
+	result->addClickHandler([=] {
+
+	});
+	return result;
+}
+
+object_ptr<Ui::RpWidget> SetupUnlink(
+		not_null<QWidget*> parent,
+		not_null<ChannelData*> channel,
+		Fn<void(ChannelData*)> callback) {
+	auto result = object_ptr<Info::Profile::Button>(
+		parent,
+		Lang::Viewer(channel->isBroadcast()
+			? lng_manage_discussion_group_unlink
+			: lng_manage_linked_channel_unlink
+		) | Info::Profile::ToUpperValue(),
+		st::infoUnlinkChatButton);
+	result->addClickHandler([=] {
+		callback(nullptr);
+	});
+	return result;
+}
+
 } // namespace
 
 EditLinkedChatBox::EditLinkedChatBox(
@@ -51,90 +193,15 @@ object_ptr<Ui::RpWidget> EditLinkedChatBox::setupContent(
 	Expects(channel->isBroadcast() || (chat != nullptr));
 
 	auto result = object_ptr<Ui::VerticalLayout>(this);
-	const auto about = result->add(
-		object_ptr<Ui::FlatLabel>(
-			result,
-			QString(),
-			Ui::FlatLabel::InitType::Simple,
-			st::linkedChatAbout),
+	result->add(
+		SetupAbout(result, channel, chat),
 		st::linkedChatAboutPadding);
-	about->setMarkedText([&]() -> TextWithEntities {
-		if (!channel->isBroadcast()) {
-			return lng_manage_linked_channel_about__generic<
-				TextWithEntities
-			>(lt_channel, BoldText(chat->name));
-		} else if (chat != nullptr) {
-			return lng_manage_discussion_group_about_chosen__generic<
-				TextWithEntities
-			>(lt_group, BoldText(chat->name));
-		} else {
-			return { lang(lng_manage_discussion_group_about) };
-		}
-	}());
-
-	class ListController
-		: public PeerListController
-		, public PeerListContentDelegate {
-	public:
-		ListController(Fn<void(not_null<ChannelData*>)> callback)
-		: _callback(std::move(callback)) {
-		}
-		void prepare() override {
-		}
-		void rowClicked(not_null<PeerListRow*> row) override {
-			_callback(row->peer()->asChannel());
-		}
-		void peerListSetTitle(Fn<QString()> title) override {
-		}
-		void peerListSetAdditionalTitle(Fn<QString()> title) override {
-		}
-		bool peerListIsRowSelected(not_null<PeerData*> peer) override {
-			return false;
-		}
-		int peerListSelectedRowsCount() override {
-			return 0;
-		}
-		auto peerListCollectSelectedRows()
-		-> std::vector<not_null<PeerData*>> override {
-			return {};
-		}
-		void peerListScrollToTop() override {
-		}
-		void peerListAddSelectedRowInBunch(
-			not_null<PeerData*> peer) override {
-		}
-		void peerListFinishSelectedRowsBunch() override {
-		}
-		void peerListSetDescription(
-			object_ptr<Ui::FlatLabel> description) override {
-		}
-
-	private:
-		Fn<void(not_null<ChannelData*>)> _callback;
-
-	};
-	const auto controller = Ui::CreateChild<ListController>(this, [=](not_null<ChannelData*> chat) {
-		const auto onstack = callback;
-		onstack(chat);
-	});
-	controller->setDelegate(controller);
-	const auto list = result->add(object_ptr<PeerListContent>(
-		this,
-		controller,
-		st::peerListBox));
-	const auto createRow = [](not_null<ChannelData*> chat) {
-		auto result = std::make_unique<PeerListRow>(chat);
-		result->setCustomStatus(chat->isPublic()
-			? ('@' + chat->username)
-			: lang(lng_manage_discussion_group_private));
-		return result;
-	};
+	if (!chat) {
+		result->add(SetupCreateGroup(result, channel));
+	}
+	result->add(SetupList(result, channel, chat, chats, callback));
 	if (chat) {
-		list->appendRow(createRow(chat));
-	} else {
-		for (const auto chat : chats) {
-			list->appendRow(createRow(chat));
-		}
+		result->add(SetupUnlink(result, channel, callback));
 	}
 	return result;
 }

Telegram/SourceFiles/boxes/peers/edit_peer_info_box.cpp

@@ -232,6 +232,7 @@ private:
 
 	std::optional<Privacy> _privacySavedValue;
 	std::optional<ChannelData*> _linkedChatSavedValue;
+	ChannelData *_linkedChatOriginalValue = nullptr;
 	std::optional<HistoryVisibility> _historyVisibilitySavedValue;
 	std::optional<QString> _usernameSavedValue;
 	std::optional<bool> _signaturesSavedValue;
@@ -522,6 +523,10 @@ void Controller::showEditLinkedChatBox() {
 		return;
 	} else if (_linkedChatsRequestId) {
 		return;
+	} else if (channel->isMegagroup()) {
+		// Restore original linked channel.
+		callback(_linkedChatOriginalValue);
+		return;
 	}
 	_linkedChatsRequestId = _linkedChatsRequester.request(
 		MTPchannels_GetGroupsForDiscussion()
@@ -579,26 +584,39 @@ void Controller::fillPrivacyTypeButton() {
 void Controller::fillLinkedChatButton() {
 	Expects(_controls.buttonsLayout != nullptr);
 
-	_linkedChatSavedValue = _peer->isChannel()
+	_linkedChatSavedValue = _linkedChatOriginalValue = _peer->isChannel()
 		? _peer->asChannel()->linkedChat()
 		: nullptr;
 
 	const auto isGroup = (_peer->isChat() || _peer->isMegagroup());
+	auto text = !isGroup
+		? Lang::Viewer(lng_manage_discussion_group)
+		: rpl::combine(
+			Lang::Viewer(lng_manage_linked_channel),
+			Lang::Viewer(lng_manage_linked_channel_restore),
+			_linkedChatUpdates.events()
+		) | rpl::map([=](
+				const QString &edit,
+				const QString &restore,
+				ChannelData *chat) {
+			return chat ? edit : restore;
+		});
+	auto label = isGroup
+		? _linkedChatUpdates.events() | rpl::map([](ChannelData *chat) {
+			return chat ? chat->name : QString();
+		}) : rpl::combine(
+			Lang::Viewer(lng_manage_discussion_group_add),
+			_linkedChatUpdates.events()
+		) | rpl::map([=](const QString &add, ChannelData *chat) {
+			return chat
+				? chat->name
+				: add;
+		});
 	AddButtonWithText(
 		_controls.buttonsLayout,
-		Lang::Viewer(isGroup
-			? lng_manage_linked_channel
-			: lng_manage_discussion_group),
-		_linkedChatUpdates.events(
-		) | rpl::map([=](ChannelData *channel) {
-			return channel
-				? channel->name
-				: isGroup
-				? lang(lng_manage_linked_channel_set)
-				: lang(lng_manage_discussion_group_add);
-		}),
+		std::move(text),
+		std::move(label),
 		[=] { showEditLinkedChatBox(); });
-
 	_linkedChatUpdates.fire_copy(*_linkedChatSavedValue);
 }
 
@@ -782,6 +800,7 @@ void Controller::fillManageSection() {
 	if (canEditPreHistoryHidden
 		|| canEditSignatures
 		|| canEditInviteLink
+		|| canEditLinkedChat
 		|| canEditUsername) {
 		AddSkip(
 			_controls.buttonsLayout,
@@ -1297,7 +1316,7 @@ object_ptr<Info::Profile::Button> EditPeerInfoBox::CreateButton(
 		const style::icon *icon) {
 	auto result = object_ptr<Info::Profile::Button>(
 		parent,
-		std::move(text),
+		rpl::duplicate(text),
 		st.button);
 	const auto button = result.data();
 	button->addClickHandler(callback);
@@ -1307,9 +1326,26 @@ object_ptr<Info::Profile::Button> EditPeerInfoBox::CreateButton(
 			*icon,
 			st.iconPosition);
 	}
+
+	auto labelText = rpl::combine(
+		std::move(text),
+		std::move(count),
+		button->widthValue()
+	) | rpl::map([&st](const QString &text, const QString &count, int width) {
+		const auto available = width
+			- st.button.padding.left()
+			- (st.button.font->spacew * 2)
+			- st.button.font->width(text)
+			- st.labelPosition.x();
+		const auto required = st.label.style.font->width(count);
+		return (required > available)
+			? st.label.style.font->elided(count, std::max(available, 0))
+			: count;
+	});
+
 	const auto label = Ui::CreateChild<Ui::FlatLabel>(
 		button,
-		std::move(count),
+		std::move(labelText),
 		st.label);
 	label->setAttribute(Qt::WA_TransparentForMouseEvents);
 

Telegram/SourceFiles/info/info.style

@@ -435,6 +435,13 @@ infoBlockButton: InfoProfileButton(infoProfileButton) {
 	textFg: attentionButtonFg;
 	textFgOver: attentionButtonFgOver;
 }
+infoCreateLinkedChatButton: InfoProfileButton(infoMainButton) {
+	padding: margins(73px, 10px, 8px, 8px);
+}
+infoUnlinkChatButton: InfoProfileButton(infoCreateLinkedChatButton) {
+	textFg: attentionButtonFg;
+	textFgOver: attentionButtonFgOver;
+}
 infoBlockButtonSkip: 8px;
 
 infoMembersHeader: 56px;
@@ -610,7 +617,7 @@ manageGroupTopButtonWithText: InfoProfileCountButton(manageGroupButton) {
 	button: InfoProfileButton(infoProfileButton) {
 		padding: margins(22px, 10px, 24px, 8px);
 	}
-	labelPosition: point(22px, 11px);
+	labelPosition: point(22px, 10px);
 	iconPosition: point(0px, 0px);
 }