Improved style of box for editing of linked chat.

Telegram/Resources/langs/lang.strings

@@ -1332,8 +1332,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_manage_discussion_group_add" = "Add a group";
 "lng_manage_linked_channel" = "Linked channel";
 "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_about" = "Select a group chat that will host comments from your channel.";
+"lng_manage_discussion_group_about_chosen" = "{group} is selected as the group that hosts comments for your channel.";
 "lng_manage_discussion_group_create" = "Create a new group";
 "lng_manage_discussion_group_unlink" = "Unlink group";
 "lng_manage_discussion_group_posted" = "Everything you post in the channel is forwarded to this group.";

Telegram/Resources/qrc/telegram/animations.qrc

@@ -9,5 +9,6 @@
     <file alias="cloud_password/hint.tgs">../../animations/cloud_password/hint.tgs</file>
     <file alias="cloud_password/email.tgs">../../animations/cloud_password/email.tgs</file>
     <file alias="ttl.tgs">../../animations/ttl.tgs</file>
+    <file alias="discussion.tgs">../../animations/discussion.tgs</file>
   </qresource>
 </RCC>

Telegram/SourceFiles/boxes/peers/edit_linked_chat_box.cpp

@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "lang/lang_keys.h"
 #include "data/data_channel.h"
 #include "data/data_chat.h"
+#include "settings/settings_common.h"
 #include "data/data_changes.h"
 #include "ui/widgets/labels.h"
 #include "ui/widgets/buttons.h"
@@ -25,6 +26,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "styles/style_layers.h"
 #include "styles/style_boxes.h"
 #include "styles/style_info.h"
+#include "styles/style_settings.h"
 
 namespace {
 
@@ -208,47 +210,24 @@ void Controller::choose(not_null<ChatData*> chat) {
 		Ui::LayerOption::KeepOther);
 }
 
-object_ptr<Ui::RpWidget> SetupAbout(
-		not_null<QWidget*> parent,
+[[nodiscard]] rpl::producer<TextWithEntities> About(
 		not_null<ChannelData*> channel,
 		ChannelData *chat) {
-	auto about = object_ptr<Ui::FlatLabel>(
-		parent,
-		QString(),
-		st::linkedChatAbout);
-	about->setMarkedText([&] {
-		if (!channel->isBroadcast()) {
-			return tr::lng_manage_linked_channel_about(
-				tr::now,
-				lt_channel,
-				Ui::Text::Bold(chat->name()),
-				Ui::Text::WithEntities);
-		} else if (chat != nullptr) {
-			return tr::lng_manage_discussion_group_about_chosen(
-				tr::now,
-				lt_group,
-				Ui::Text::Bold(chat->name()),
-				Ui::Text::WithEntities);
-		}
-		return tr::lng_manage_discussion_group_about(
-			tr::now,
+	if (!channel->isBroadcast()) {
+		return tr::lng_manage_linked_channel_about(
+			lt_channel,
+			rpl::single(Ui::Text::Bold(chat->name())),
 			Ui::Text::WithEntities);
-	}());
-	return about;
+	} else if (chat != nullptr) {
+		return tr::lng_manage_discussion_group_about_chosen(
+			lt_group,
+			rpl::single(Ui::Text::Bold(chat->name())),
+			Ui::Text::WithEntities);
+	}
+	return tr::lng_manage_discussion_group_about(Ui::Text::WithEntities);
 }
 
-object_ptr<Ui::RpWidget> SetupFooter(
-		not_null<QWidget*> parent,
-		not_null<ChannelData*> channel) {
-	return object_ptr<Ui::FlatLabel>(
-		parent,
-		(channel->isBroadcast()
-			? tr::lng_manage_discussion_group_posted
-			: tr::lng_manage_linked_channel_posted)(),
-		st::linkedChatAbout);
-}
-
-object_ptr<Ui::RpWidget> SetupCreateGroup(
+[[nodiscard]] object_ptr<Ui::RpWidget> SetupCreateGroup(
 		not_null<QWidget*> parent,
 		not_null<Window::SessionNavigation*> navigation,
 		not_null<ChannelData*> channel,
@@ -273,23 +252,7 @@ object_ptr<Ui::RpWidget> SetupCreateGroup(
 	return result;
 }
 
-object_ptr<Ui::RpWidget> SetupUnlink(
-		not_null<QWidget*> parent,
-		not_null<ChannelData*> channel,
-		Fn<void(ChannelData*)> callback) {
-	auto result = object_ptr<Ui::SettingsButton>(
-		parent,
-		(channel->isBroadcast()
-			? tr::lng_manage_discussion_group_unlink
-			: tr::lng_manage_linked_channel_unlink)() | Ui::Text::ToUpper(),
-		st::infoUnlinkChatButton);
-	result->addClickHandler([=] {
-		callback(nullptr);
-	});
-	return result;
-}
-
-object_ptr<Ui::BoxContent> EditLinkedChatBox(
+[[nodiscard]] object_ptr<Ui::BoxContent> EditLinkedChatBox(
 		not_null<Window::SessionNavigation*> navigation,
 		not_null<ChannelData*> channel,
 		ChannelData *chat,
@@ -298,27 +261,61 @@ object_ptr<Ui::BoxContent> EditLinkedChatBox(
 		Fn<void(ChannelData*)> callback) {
 	Expects((channel->isBroadcast() && canEdit) || (chat != nullptr));
 
-	const auto init = [=](not_null<PeerListBox*> box) {
+	class ListBox final : public PeerListBox {
+	public:
+		ListBox(
+			QWidget *parent,
+			std::unique_ptr<PeerListController> controller,
+			Fn<void(not_null<ListBox*>)> init)
+		: PeerListBox(
+			parent,
+			std::move(controller),
+			[=](not_null<PeerListBox*>) { init(this); }) {
+		}
+
+		void showFinished() override {
+			_showFinished.fire({});
+		}
+
+		rpl::producer<> showFinishes() const {
+			return _showFinished.events();
+		}
+
+	private:
+		rpl::event_stream<> _showFinished;
+
+	};
+
+	const auto init = [=](not_null<ListBox*> box) {
 		auto above = object_ptr<Ui::VerticalLayout>(box);
-		above->add(
-			SetupAbout(above, channel, chat),
-			st::linkedChatAboutPadding);
+		Settings::AddDividerTextWithLottie(
+			above,
+			box->showFinishes(),
+			About(channel, chat),
+			u"discussion"_q);
 		if (!chat) {
-			above->add(SetupCreateGroup(
-				above,
-				navigation,
-				channel,
-				callback));
+			above->add(
+				SetupCreateGroup(above, navigation, channel, callback));
 		}
 		box->peerListSetAboveWidget(std::move(above));
 
 		auto below = object_ptr<Ui::VerticalLayout>(box);
 		if (chat && canEdit) {
-			below->add(SetupUnlink(below, channel, callback));
+			Settings::AddButton(
+				below,
+				(channel->isBroadcast()
+					? tr::lng_manage_discussion_group_unlink
+					: tr::lng_manage_linked_channel_unlink)(),
+				st::infoUnlinkChatButton,
+				{ &st::settingsIconMinus, Settings::kIconRed }
+			)->addClickHandler([=] { callback(nullptr); });
+			Settings::AddSkip(below);
 		}
-		below->add(
-			SetupFooter(below, channel),
-			st::linkedChatAboutPadding);
+		Settings::AddDividerText(
+			below,
+			(channel->isBroadcast()
+				? tr::lng_manage_discussion_group_posted
+				: tr::lng_manage_linked_channel_posted)());
 		box->peerListSetBelowWidget(std::move(below));
 
 		box->setTitle(channel->isBroadcast()
@@ -339,7 +336,7 @@ object_ptr<Ui::BoxContent> EditLinkedChatBox(
 		std::move(chats),
 		std::move(callback),
 		std::move(showHistoryCallback));
-	return Box<PeerListBox>(std::move(controller), init);
+	return Box<ListBox>(std::move(controller), init);
 }
 
 } // namespace

Telegram/SourceFiles/boxes/peers/edit_linked_chat_box.h

@@ -17,14 +17,14 @@ namespace Window {
 class SessionNavigation;
 } // namespace Window
 
-object_ptr<Ui::BoxContent> EditLinkedChatBox(
+[[nodiscard]] object_ptr<Ui::BoxContent> EditLinkedChatBox(
 	not_null<Window::SessionNavigation*> navigation,
 	not_null<ChannelData*> channel,
 	not_null<ChannelData*> chat,
 	bool canEdit,
 	Fn<void(ChannelData*)> callback);
 
-object_ptr<Ui::BoxContent> EditLinkedChatBox(
+[[nodiscard]] object_ptr<Ui::BoxContent> EditLinkedChatBox(
 	not_null<Window::SessionNavigation*> navigation,
 	not_null<ChannelData*> channel,
 	std::vector<not_null<PeerData*>> &&chats,