Load and show list of users who viewed a story.

Telegram/SourceFiles/data/data_stories.cpp

@@ -181,10 +181,48 @@ const std::vector<not_null<PeerData*>> &Story::recentViewers() const {
 	return _recentViewers;
 }
 
+const std::vector<StoryView> &Story::viewsList() const {
+	return _viewsList;
+}
+
 int Story::views() const {
 	return _views;
 }
 
+void Story::applyViewsSlice(
+		const std::optional<StoryView> &offset,
+		const std::vector<StoryView> &slice,
+		int total) {
+	_views = total;
+	if (!offset) {
+		const auto i = _viewsList.empty()
+			? end(slice)
+			: ranges::find(slice, _viewsList.front());
+		const auto merge = (i != end(slice))
+			&& !ranges::contains(slice, _viewsList.back());
+		if (merge) {
+			_viewsList.insert(begin(_viewsList), begin(slice), i);
+		} else {
+			_viewsList = slice;
+		}
+	} else if (!slice.empty()) {
+		const auto i = ranges::find(_viewsList, *offset);
+		const auto merge = (i != end(_viewsList))
+			&& !ranges::contains(_viewsList, slice.back());
+		if (merge) {
+			const auto after = i + 1;
+			if (after == end(_viewsList)) {
+				_viewsList.insert(after, begin(slice), end(slice));
+			} else {
+				const auto j = ranges::find(slice, _viewsList.back());
+				if (j != end(slice)) {
+					_viewsList.insert(end(_viewsList), j + 1, end(slice));
+				}
+			}
+		}
+	}
+}
+
 bool Story::applyChanges(StoryMedia media, const MTPDstoryItem &data) {
 	const auto pinned = data.is_pinned();
 	auto caption = TextWithEntities{
@@ -683,6 +721,56 @@ void Stories::sendMarkAsReadRequests() {
 	}
 }
 
+void Stories::loadViewsSlice(
+		StoryId id,
+		std::optional<StoryView> offset,
+		Fn<void(std::vector<StoryView>)> done) {
+	_viewsDone = std::move(done);
+	if (_viewsStoryId == id && _viewsOffset == offset) {
+		return;
+	}
+	_viewsStoryId = id;
+	_viewsOffset = offset;
+
+	const auto api = &_owner->session().api();
+	api->request(_viewsRequestId).cancel();
+	_viewsRequestId = api->request(MTPstories_GetStoryViewsList(
+		MTP_int(id),
+		MTP_int(offset ? offset->date : 0),
+		MTP_long(offset ? peerToUser(offset->peer->id).bare : 0),
+		MTP_int(2)
+	)).done([=](const MTPstories_StoryViewsList &result) {
+		_viewsRequestId = 0;
+
+		auto slice = std::vector<StoryView>();
+
+		const auto &data = result.data();
+		_owner->processUsers(data.vusers());
+		slice.reserve(data.vviews().v.size());
+		for (const auto &view : data.vviews().v) {
+			slice.push_back({
+				.peer = _owner->peer(peerFromUser(view.data().vuser_id())),
+				.date = view.data().vdate().v,
+			});
+		}
+		const auto fullId = FullStoryId{
+			.peer = _owner->session().userPeerId(),
+			.story = _viewsStoryId,
+		};
+		if (const auto story = lookup(fullId)) {
+			(*story)->applyViewsSlice(_viewsOffset, slice, data.vcount().v);
+		}
+		if (const auto done = base::take(_viewsDone)) {
+			done(std::move(slice));
+		}
+	}).fail([=] {
+		_viewsRequestId = 0;
+		if (const auto done = base::take(_viewsDone)) {
+			done({});
+		}
+	}).send();
+}
+
 bool Stories::isQuitPrevent() {
 	if (!_markReadPending.empty()) {
 		sendMarkAsReadRequests();

Telegram/SourceFiles/data/data_stories.h

@@ -28,6 +28,13 @@ struct StoryMedia {
 	friend inline bool operator==(StoryMedia, StoryMedia) = default;
 };
 
+struct StoryView {
+	not_null<PeerData*> peer;
+	TimeId date = 0;
+
+	friend inline bool operator==(StoryView, StoryView) = default;
+};
+
 class Story {
 public:
 	Story(
@@ -60,7 +67,12 @@ public:
 	void setViewsData(std::vector<not_null<PeerData*>> recent, int total);
 	[[nodiscard]] auto recentViewers() const
 		-> const std::vector<not_null<PeerData*>> &;
+	[[nodiscard]] const std::vector<StoryView> &viewsList() const;
 	[[nodiscard]] int views() const;
+	void applyViewsSlice(
+		const std::optional<StoryView> &offset,
+		const std::vector<StoryView> &slice,
+		int total);
 
 	bool applyChanges(StoryMedia media, const MTPDstoryItem &data);
 
@@ -70,6 +82,7 @@ private:
 	StoryMedia _media;
 	TextWithEntities _caption;
 	std::vector<not_null<PeerData*>> _recentViewers;
+	std::vector<StoryView> _viewsList;
 	int _views = 0;
 	const TimeId _date = 0;
 	bool _pinned = false;
@@ -124,6 +137,12 @@ public:
 	[[nodiscard]] bool isQuitPrevent();
 	void markAsRead(FullStoryId id, bool viewed);
 
+	static constexpr auto kViewsPerPage = 50;
+	void loadViewsSlice(
+		StoryId id,
+		std::optional<StoryView> offset,
+		Fn<void(std::vector<StoryView>)> done);
+
 private:
 	[[nodiscard]] StoriesList parse(const MTPUserStories &stories);
 	[[nodiscard]] Story *parseAndApply(
@@ -172,6 +191,11 @@ private:
 	base::Timer _markReadTimer;
 	base::flat_set<PeerId> _markReadRequests;
 
+	StoryId _viewsStoryId = 0;
+	std::optional<StoryView> _viewsOffset;
+	Fn<void(std::vector<StoryView>)> _viewsDone;
+	mtpRequestId _viewsRequestId = 0;
+
 };
 
 } // namespace Data