Support basic feed display in chats list.

Telegram/SourceFiles/data/data_feed.h

@@ -7,11 +7,47 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #pragma once
 
+#include "dialogs/dialogs_entry.h"
+
 class ChannelData;
 
 namespace Data {
 
-class Feed {
+struct FeedPosition {
+	FeedPosition() = default;
+	FeedPosition(const MTPFeedPosition &position);
+	FeedPosition(not_null<HistoryItem*> item);
+
+	explicit operator bool() const {
+		return (msgId != 0);
+	}
+
+	bool operator<(const FeedPosition &other) const;
+	inline bool operator>(const FeedPosition &other) const {
+		return other < *this;
+	}
+	inline bool operator<=(const FeedPosition &other) const {
+		return !(other < *this);
+	}
+	inline bool operator>=(const FeedPosition &other) const {
+		return !(*this < other);
+	}
+	inline bool operator==(const FeedPosition &other) const {
+		return (date == other.date)
+			&& (peerId == other.peerId)
+			&& (msgId == other.msgId);
+	}
+	inline bool operator!=(const FeedPosition &other) const {
+		return !(*this == other);
+	}
+
+	TimeId date = 0;
+	PeerId peerId = 0;
+	MsgId msgId = 0;
+
+};
+
+class Feed : public Dialogs::Entry {
 public:
 	Feed(FeedId id);
 
@@ -21,20 +57,44 @@ public:
 	void registerOne(not_null<ChannelData*> channel);
 	void unregisterOne(not_null<ChannelData*> channel);
 
-	void setUnreadCounts(int unreadCount, int unreadMutedCount);
+	void updateLastMessage(not_null<HistoryItem*> item);
+	void messageRemoved(not_null<HistoryItem*> item);
+	void historyCleared(not_null<History*> history);
 
-	bool isPinnedDialog() const {
-		return _pinnedIndex > 0;
+	void setUnreadCounts(int unreadCount, int unreadMutedCount);
+	void setUnreadPosition(const FeedPosition &position);
+
+	bool toImportant() const override {
+		return false; // TODO feeds workmode
 	}
-	void cachePinnedIndex(int index);
-	uint64 sortKeyInChatList() const;
+	int chatListUnreadCount() const override {
+		return _unreadCount;
+	}
+	bool chatListMutedBadge() const override {
+		return _unreadCount <= _unreadMutedCount;
+	}
+	HistoryItem *chatsListItem() const override {
+		return _lastMessage;
+	}
+	void loadUserpic() override;
+	void paintUserpic(
+		Painter &p,
+		int x,
+		int y,
+		int size) const override;
 
 private:
+	void recountLastMessage();
+	bool justSetLastMessage(not_null<HistoryItem*> item);
+
 	FeedId _id = 0;
-	base::flat_set<not_null<ChannelData*>> _channels;
+	std::vector<not_null<History*>> _channels;
+
+	HistoryItem *_lastMessage = nullptr;
+
+	FeedPosition _unreadPosition;
 	int _unreadCount = 0;
 	int _unreadMutedCount = 0;
-	int _pinnedIndex = 0;
 	bool _complete = false;
 
 };