Added ability to insert custom separators to PeerListsBox.

Telegram/SourceFiles/boxes/peer_lists_box.cpp

@@ -146,12 +146,12 @@ void PeerListsBox::updateScrollSkips() {
 }
 
 void PeerListsBox::prepare() {
-	auto rows = setInnerWidget(
+	_rows = setInnerWidget(
 		object_ptr<Ui::VerticalLayout>(this),
 		st::boxScroll);
 	for (auto &list : _lists) {
-		const auto content = rows->add(object_ptr<PeerListContent>(
-			rows,
+		const auto content = _rows->add(object_ptr<PeerListContent>(
+			_rows,
 			list.controller.get()));
 		list.content = content;
 		list.delegate->setContent(content);
@@ -176,13 +176,13 @@ void PeerListsBox::prepare() {
 			}
 		}, lifetime());
 	}
-	rows->resizeToWidth(firstController()->contentWidth());
+	_rows->resizeToWidth(firstController()->contentWidth());
 
 	{
 		setDimensions(
 			firstController()->contentWidth(),
 			std::clamp(
-				rows->height(),
+				_rows->height(),
 				st::boxMaxListHeight,
 				st::boxMaxListHeight * 3));
 	}
@@ -350,6 +350,24 @@ void PeerListsBox::Delegate::peerListSetForeignRowChecked(
 	}
 }
 
+void PeerListsBox::addSeparatorBefore(
+		int listIndex,
+		object_ptr<Ui::RpWidget> widget) {
+	if (listIndex < 0 || listIndex >= int(_lists.size()) || !_rows) {
+		return;
+	}
+	const auto position = listIndex * 2;
+	auto wrapped = object_ptr<Ui::SlideWrap<>>(
+		_rows,
+		std::move(widget));
+	_lists[listIndex].content->heightValue(
+	) | rpl::on_next([=, separator = wrapped.data()](int h) {
+		separator->toggle(h > 0, anim::type::instant);
+	}, wrapped->lifetime());
+	_lists[listIndex].separator = wrapped.data();
+	_rows->insert(position, std::move(wrapped));
+}
+
 void PeerListsBox::Delegate::peerListScrollToTop() {
 	_box->scrollToY(0);
 }

Telegram/SourceFiles/boxes/peer_lists_box.h

@@ -9,6 +9,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "boxes/peer_list_box.h"
 
+namespace Ui {
+class VerticalLayout;
+} // namespace Ui
+
 class PeerListsBox : public Ui::BoxContent {
 public:
 	PeerListsBox(
@@ -16,6 +20,8 @@ public:
 		std::vector<std::unique_ptr<PeerListController>> controllers,
 		Fn<void(not_null<PeerListsBox*>)> init);
 
+	void addSeparatorBefore(int listIndex, object_ptr<Ui::RpWidget> widget);
+
 	[[nodiscard]] std::vector<not_null<PeerData*>> collectSelectedRows();
 
 protected:
@@ -66,6 +72,7 @@ private:
 		std::unique_ptr<PeerListController> controller;
 		std::unique_ptr<Delegate> delegate;
 		PeerListContent *content = nullptr;
+		Ui::SlideWrap<Ui::RpWidget> *separator = nullptr;
 	};
 
 	friend class Delegate;
@@ -99,5 +106,6 @@ private:
 	std::vector<List> _lists;
 	Fn<void(PeerListsBox*)> _init;
 	bool _scrollBottomFixed = false;
+	Ui::VerticalLayout *_rows = nullptr;
 
 };