Remove some code duplication.

Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.h

@@ -12,6 +12,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "ui/effects/animations.h"
 #include "ui/rp_widget.h"
 
+class PeerListContent;
+
 namespace Data {
 class Thread;
 } // namespace Data
@@ -67,17 +69,19 @@ public:
 	}
 	[[nodiscard]] auto recentPeerChosen() const
 	-> rpl::producer<not_null<PeerData*>> {
-		return _recentPeerChosen.events();
+		return _recent->chosen.events();
 	}
 	[[nodiscard]] auto myChannelChosen() const
 	-> rpl::producer<not_null<PeerData*>> {
-		return _myChannelChosen.events();
+		return _myChannels->chosen.events();
 	}
 	[[nodiscard]] auto recommendationChosen() const
 	-> rpl::producer<not_null<PeerData*>> {
-		return _recommendationChosen.events();
+		return _recommendations->chosen.events();
 	}
 
+	class ObjectListController;
+
 private:
 	enum class Tab : uchar {
 		Chats,
@@ -89,6 +93,17 @@ private:
 		AppliedAndOut,
 	};
 
+	struct ObjectList {
+		not_null<Ui::SlideWrap<PeerListContent>*> wrap;
+		rpl::variable<int> count;
+		Fn<bool()> choose;
+		Fn<JumpResult(Qt::Key, int)> selectJump;
+		Fn<uint64(QPoint)> updateFromParentDrag;
+		Fn<void()> dragLeft;
+		Fn<bool(not_null<QTouchEvent*>)> processTouch;
+		rpl::event_stream<not_null<PeerData*>> chosen;
+	};
+
 	void paintEvent(QPaintEvent *e) override;
 	void resizeEvent(QResizeEvent *e) override;
 
@@ -104,14 +119,22 @@ private:
 		QPoint globalPosition);
 	[[nodiscard]] Data::Thread *fromListId(uint64 peerListRowId);
 
-	[[nodiscard]] object_ptr<Ui::SlideWrap<Ui::RpWidget>> setupRecentPeers(
+	[[nodiscard]] std::unique_ptr<ObjectList> setupRecentPeers(
 		RecentPeersList recentPeers);
-	[[nodiscard]] object_ptr<Ui::SlideWrap<Ui::RpWidget>> setupEmptyRecent();
+	[[nodiscard]] auto setupEmptyRecent()
-	[[nodiscard]] object_ptr<Ui::SlideWrap<Ui::RpWidget>> setupMyChannels();
-	[[nodiscard]] auto setupRecommendations()
 		-> object_ptr<Ui::SlideWrap<Ui::RpWidget>>;
+
+	[[nodiscard]] std::unique_ptr<ObjectList> setupMyChannels();
+	[[nodiscard]] std::unique_ptr<ObjectList> setupRecommendations();
 	[[nodiscard]] auto setupEmptyChannels()
 		-> object_ptr<Ui::SlideWrap<Ui::RpWidget>>;
+
+	[[nodiscard]] std::unique_ptr<ObjectList> setupObjectList(
+		not_null<Ui::ElasticScroll*> scroll,
+		not_null<Ui::VerticalLayout*> parent,
+		not_null<ObjectListController*> controller,
+		Fn<int()> addToScroll = nullptr);
+
 	[[nodiscard]] object_ptr<Ui::SlideWrap<Ui::RpWidget>> setupEmpty(
 		not_null<QWidget*> parent,
 		SearchEmptyIcon icon,
@@ -131,44 +154,23 @@ private:
 
 	const std::unique_ptr<Ui::ElasticScroll> _chatsScroll;
 	const not_null<Ui::VerticalLayout*> _chatsContent;
+
 	const not_null<Ui::SlideWrap<TopPeersStrip>*> _topPeersWrap;
 	const not_null<TopPeersStrip*> _topPeers;
+	rpl::event_stream<not_null<PeerData*>> _topPeerChosen;
+
+	const std::unique_ptr<ObjectList> _recent;
 
-	rpl::variable<int> _recentCount;
-	Fn<bool()> _recentPeersChoose;
-	Fn<JumpResult(Qt::Key, int)> _recentSelectJump;
-	Fn<uint64(QPoint)> _recentUpdateFromParentDrag;
-	Fn<void()> _recentDragLeft;
-	Fn<bool(not_null<QTouchEvent*>)> _recentProcessTouch;
-	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _recentPeers;
 	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _emptyRecent;
 
 	const std::unique_ptr<Ui::ElasticScroll> _channelsScroll;
 	const not_null<Ui::VerticalLayout*> _channelsContent;
 
-	rpl::variable<int> _myChannelsCount;
+	const std::unique_ptr<ObjectList> _myChannels;
-	Fn<bool()> _myChannelsChoose;
+	const std::unique_ptr<ObjectList> _recommendations;
-	Fn<JumpResult(Qt::Key, int)> _myChannelsSelectJump;
-	Fn<uint64(QPoint)> _myChannelsUpdateFromParentDrag;
-	Fn<void()> _myChannelsDragLeft;
-	Fn<bool(not_null<QTouchEvent*>)> _myChannelsProcessTouch;
-	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _myChannels;
-
-	rpl::variable<int> _recommendationsCount;
-	Fn<bool()> _recommendationsChoose;
-	Fn<JumpResult(Qt::Key, int)> _recommendationsSelectJump;
-	Fn<uint64(QPoint)> _recommendationsUpdateFromParentDrag;
-	Fn<void()> _recommendationsDragLeft;
-	Fn<bool(not_null<QTouchEvent*>)> _recommendationsProcessTouch;
-	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _recommendations;
 
 	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _emptyChannels;
 
-	rpl::event_stream<not_null<PeerData*>> _topPeerChosen;
-	rpl::event_stream<not_null<PeerData*>> _recentPeerChosen;
-	rpl::event_stream<not_null<PeerData*>> _myChannelChosen;
-	rpl::event_stream<not_null<PeerData*>> _recommendationChosen;
-
 	Ui::Animations::Simple _shownAnimation;
 	Fn<void()> _showFinished;
 	bool _hidden = false;