Support basic feed display in chats list.

Telegram/SourceFiles/data/data_feed.cpp

@@ -7,17 +7,126 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "data/data_feed.h"
 
+#include "dialogs/dialogs_key.h"
+
 namespace Data {
 
-Feed::Feed(FeedId id) : _id(id) {
+FeedPosition::FeedPosition(const MTPFeedPosition &position)
+: date(position.c_feedPosition().vdate.v)
+, peerId(peerFromMTP(position.c_feedPosition().vpeer))
+, msgId(position.c_feedPosition().vid.v) {
+}
+
+FeedPosition::FeedPosition(not_null<HistoryItem*> item)
+: date(toServerTime(item->date.toTime_t()).v)
+, peerId(item->history()->peer->id)
+, msgId(item->id) {
+}
+
+bool FeedPosition::operator<(const FeedPosition &other) const {
+	if (date < other.date) {
+		return true;
+	} else if (other.date < date) {
+		return false;
+	}
+	const auto peer = peerToBareInt(peerId);
+	const auto otherPeer = peerToBareInt(other.peerId);
+	if (peer < otherPeer) {
+		return true;
+	} else if (otherPeer < peer) {
+		return false;
+	}
+	return (msgId < other.msgId);
+}
+
+Feed::Feed(FeedId id)
+: Entry(this)
+, _id(id) {
 }
 
 void Feed::registerOne(not_null<ChannelData*> channel) {
-	_channels.emplace(channel);
+	const auto history = App::history(channel);
+	if (!base::contains(_channels, history)) {
+		_channels.push_back(history);
+		if (history->lastMsg) {
+			updateLastMessage(history->lastMsg);
+		}
+	}
 }
 
 void Feed::unregisterOne(not_null<ChannelData*> channel) {
-	_channels.remove(channel);
+	const auto history = App::history(channel);
+	_channels.erase(ranges::remove(_channels, history), end(_channels));
+	if (_lastMessage->history() == history) {
+		messageRemoved(_lastMessage);
+	}
+}
+
+void Feed::updateLastMessage(not_null<HistoryItem*> item) {
+	if (justSetLastMessage(item)) {
+		setChatsListDate(_lastMessage->date);
+	}
+}
+
+void Feed::loadUserpic() {
+	constexpr auto kPaintUserpicsCount = 4;
+	auto load = kPaintUserpicsCount;
+	for (const auto channel : _channels) {
+		channel->peer->loadUserpic();
+		if (!--load) {
+			break;
+		}
+	}
+}
+
+void Feed::paintUserpic(
+		Painter &p,
+		int x,
+		int y,
+		int size) const {
+	const auto small = (size - st::lineWidth) / 2;
+	const auto delta = size - small;
+	auto index = 0;
+	for (const auto channel : _channels) {
+		channel->peer->paintUserpic(p, x, y, small);
+		switch (++index) {
+		case 1:
+		case 3: x += delta; break;
+		case 2: x -= delta; y += delta; break;
+		}
+	}
+}
+
+bool Feed::justSetLastMessage(not_null<HistoryItem*> item) {
+	if (_lastMessage && FeedPosition(item) <= FeedPosition(_lastMessage)) {
+		return false;
+	}
+	_lastMessage = item;
+	return true;
+}
+
+void Feed::messageRemoved(not_null<HistoryItem*> item) {
+	if (_lastMessage == item) {
+		recountLastMessage();
+	}
+}
+
+void Feed::historyCleared(not_null<History*> history) {
+	if (_lastMessage->history() == history) {
+		recountLastMessage();
+	}
+}
+
+void Feed::recountLastMessage() {
+	_lastMessage = nullptr;
+	for (const auto history : _channels) {
+		if (const auto last = history->lastMsg) {
+			justSetLastMessage(last);
+		}
+	}
+	if (_lastMessage) {
+		setChatsListDate(_lastMessage->date);
+	}
 }
 
 void Feed::setUnreadCounts(int unreadCount, int unreadMutedCount) {
@@ -25,14 +134,8 @@ void Feed::setUnreadCounts(int unreadCount, int unreadMutedCount) {
 	_unreadMutedCount = unreadMutedCount;
 }
 
-void Feed::cachePinnedIndex(int index) {
-	_pinnedIndex = index;
-}
-
-uint64 Feed::sortKeyInChatList() const {
-	return 0ULL;/* isPinnedDialog()
-		? pinnedDialogPos(_pinnedIndex)
-		: dialogPosFromDate(chatListDate());*/
+void Feed::setUnreadPosition(const FeedPosition &position) {
+	_unreadPosition = position;
 }
 
 } // namespace Data