Prepare dialogs to hold a history or a feed.

Telegram/SourceFiles/dialogs/dialogs_row.h

@@ -8,10 +8,15 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #pragma once
 
 #include "ui/text/text.h"
+#include "base/value_ordering.h"
 
 class History;
 class HistoryItem;
 
+namespace Data {
+class Feed;
+} // namespace Data
+
 namespace Ui {
 class RippleAnimation;
 } // namespace Ui
@@ -21,6 +26,79 @@ namespace Layout {
 class RowPainter;
 } // namespace Layout
 
+struct Key {
+	Key() = default;
+	Key(History *history) : value(history) {
+	}
+	Key(not_null<History*> history) : value(history) {
+	}
+	Key(Data::Feed *feed) : value(feed) {
+	}
+	Key(not_null<Data::Feed*> feed) : value(feed) {
+	}
+	const QString &name() const {
+		if (const auto p = base::get_if<not_null<History*>>(&value)) {
+			return (*p)->peer->name;
+		}
+		// #TODO feeds name
+		static const auto empty = QString();
+		return empty;
+	}
+	const PeerData::NameFirstChars &nameFirstChars() const {
+		if (const auto p = base::get_if<not_null<History*>>(&value)) {
+			return (*p)->peer->nameFirstChars();
+		}
+		// #TODO feeds name
+		static const auto empty = PeerData::NameFirstChars();
+		return empty;
+	}
+	uint64 sortKey() const {
+		if (const auto p = base::get_if<not_null<History*>>(&value)) {
+			return (*p)->sortKeyInChatList();
+		}
+		// #TODO feeds sort in chats list
+		return 0ULL;
+	}
+	History *history() const {
+		if (const auto p = base::get_if<not_null<History*>>(&value)) {
+			return *p;
+		}
+		return nullptr;
+	}
+	Data::Feed *feed() const {
+		if (const auto p = base::get_if<not_null<Data::Feed*>>(&value)) {
+			return *p;
+		}
+		return nullptr;
+	}
+
+	inline bool operator<(const Key &other) const {
+		return value < other.value;
+	}
+	inline bool operator==(const Key &other) const {
+		return value == other.value;
+	}
+
+	// Not working :(
+	//friend inline auto value_ordering_helper(const Key &key) {
+	//	return key.value;
+	//}
+
+	base::optional_variant<
+		not_null<History*>,
+		not_null<Data::Feed*>> value;
+
+};
+
+struct RowDescriptor {
+	RowDescriptor() = default;
+	RowDescriptor(Key key, MsgId msgId) : key(key), msgId(msgId) {
+	}
+
+	Key key;
+	MsgId msgId = 0;
+};
+
 class RippleRow {
 public:
 	RippleRow();
@@ -39,27 +117,44 @@ private:
 class List;
 class Row : public RippleRow {
 public:
-	Row(History *history, Row *prev, Row *next, int pos)
-		: _history(history)
-		, _prev(prev)
-		, _next(next)
-		, _pos(pos) {
+	explicit Row(std::nullptr_t) {
+	}
+	Row(Key key, Row *prev, Row *next, int pos)
+	: _id(key)
+	, _prev(prev)
+	, _next(next)
+	, _pos(pos) {
 	}
-	void *attached = nullptr; // for any attached data, for example View in contacts list
 
+	Key key() const {
+		return _id;
+	}
 	History *history() const {
-		return _history;
+		return _id.history();
+	}
+	Data::Feed *feed() const {
+		return _id.feed();
+	}
+	QString name() const {
+		return _id.name();
 	}
 	int pos() const {
 		return _pos;
 	}
+	uint64 sortKey() const {
+		return _id.sortKey();
+	}
+
+	// for any attached data, for example View in contacts list
+	void *attached = nullptr;
 
 private:
 	friend class List;
 
-	History *_history;
-	Row *_prev, *_next;
-	int _pos;
+	Key _id;
+	Row *_prev = nullptr;
+	Row *_next = nullptr;
+	int _pos = 0;
 
 };