Added initial ability to save and restore state of statistical info.

Telegram/SourceFiles/data/data_statistics.h

@@ -113,4 +113,10 @@ struct MessageStatistics final {
 	int views = 0;
 };
 
+struct AnyStatistics final {
+	Data::ChannelStatistics channel;
+	Data::SupergroupStatistics supergroup;
+	Data::MessageStatistics message;
+};
+
 } // namespace Data

Telegram/SourceFiles/info/statistics/info_statistics_inner_widget.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "info/statistics/info_statistics_inner_widget.h"
 
+#include "info/statistics/info_statistics_widget.h"
 #include "api/api_statistics.h"
 #include "apiwrap.h"
 #include "data/data_peer.h"
@@ -42,12 +43,6 @@ struct Descriptor final {
 	not_null<QWidget*> toastParent;
 };
 
-struct AnyStats final {
-	Data::ChannelStatistics channel;
-	Data::SupergroupStatistics supergroup;
-	Data::MessageStatistics message;
-};
-
 void ProcessZoom(
 		const Descriptor &d,
 		not_null<Statistic::ChartWidget*> widget,
@@ -112,7 +107,7 @@ void ProcessChart(
 void FillStatistic(
 		not_null<Ui::VerticalLayout*> content,
 		const Descriptor &descriptor,
-		const AnyStats &stats) {
+		const Data::AnyStatistics &stats) {
 	using Type = Statistic::ChartViewType;
 	const auto &padding = st::statisticsChartEntryPadding;
 	const auto &m = st::statisticsLayerMargins;
@@ -266,7 +261,7 @@ void FillLoading(
 void AddHeader(
 		not_null<Ui::VerticalLayout*> content,
 		tr::phrase<> text,
-		const AnyStats &stats) {
+		const Data::AnyStatistics &stats) {
 	const auto startDate = stats.channel
 		? stats.channel.startDate
 		: stats.supergroup.startDate;
@@ -294,7 +289,7 @@ void AddHeader(
 
 void FillOverview(
 		not_null<Ui::VerticalLayout*> content,
-		const AnyStats &stats) {
+		const Data::AnyStatistics &stats) {
 	using Value = Data::StatisticalValue;
 
 	const auto &channel = stats.channel;
@@ -552,11 +547,14 @@ InnerWidget::InnerWidget(
 , _controller(controller)
 , _peer(peer)
 , _contextId(contextId) {
+}
+
+void InnerWidget::load() {
 	const auto inner = this;
 
 	const auto descriptor = Descriptor{
-		peer,
-		lifetime().make_state<Api::Statistics>(&peer->session().api()),
+		_peer,
+		lifetime().make_state<Api::Statistics>(&_peer->session().api()),
 		_controller->uiShow()->toastParent(),
 	};
 
@@ -573,84 +571,27 @@ InnerWidget::InnerWidget(
 
 	_showFinished.events(
 	) | rpl::take(1) | rpl::start_with_next([=] {
-		if (!contextId) {
+		if (!_contextId) {
 			descriptor.api->request(
 				descriptor.peer
 			) | rpl::start_with_done([=] {
-				const auto anyStats = AnyStats{
+				_loadedStats = Data::AnyStatistics{
 					descriptor.api->channelStats(),
 					descriptor.api->supergroupStats(),
 				};
+				fill();
 
-				FillOverview(inner, anyStats);
-				FillStatistic(inner, descriptor, anyStats);
-				const auto &channel = anyStats.channel;
-				const auto &supergroup = anyStats.supergroup;
-				if (channel) {
-					auto showMessage = [=](FullMsgId fullId) {
-						_showRequests.fire({ .messageStatistic = fullId });
-					};
-					FillRecentPosts(inner, descriptor, channel, showMessage);
-				} else if (supergroup) {
-					const auto showPeerInfo = [=](not_null<PeerData*> peer) {
-						_showRequests.fire({ .info = peer->id });
-					};
-					const auto addSkip = [&](
-							not_null<Ui::VerticalLayout*> c) {
-						::Settings::AddSkip(c);
-						::Settings::AddDivider(c);
-						::Settings::AddSkip(c);
-						::Settings::AddSkip(c);
-					};
-					if (!supergroup.topSenders.empty()) {
-						AddMembersList(
-							{ .topSenders = supergroup.topSenders },
-							inner,
-							showPeerInfo,
-							descriptor.peer,
-							tr::lng_stats_members_title());
-					}
-					if (!supergroup.topAdministrators.empty()) {
-						addSkip(inner);
-						AddMembersList(
-							{ .topAdministrators
-								= supergroup.topAdministrators },
-							inner,
-							showPeerInfo,
-							descriptor.peer,
-							tr::lng_stats_admins_title());
-					}
-					if (!supergroup.topInviters.empty()) {
-						addSkip(inner);
-						AddMembersList(
-							{ .topInviters = supergroup.topInviters },
-							inner,
-							showPeerInfo,
-							descriptor.peer,
-							tr::lng_stats_inviters_title());
-					}
-				}
 				finishLoading();
 			}, lifetime());
 		} else {
 			const auto lifetimeApi = lifetime().make_state<rpl::lifetime>();
 			const auto api = lifetimeApi->make_state<Api::MessageStatistics>(
 				descriptor.peer->asChannel(),
-				contextId);
+				_contextId);
 
 			api->request([=](const Data::MessageStatistics &data) {
-				const auto stats = AnyStats{ .message = data };
-				FillOverview(inner, stats);
-				FillStatistic(inner, descriptor, stats);
-				auto showPeerHistory = [=](FullMsgId fullId) {
-					_showRequests.fire({ .history = fullId });
-				};
-				AddPublicForwards(
-					*api,
-					inner,
-					std::move(showPeerHistory),
-					descriptor.peer,
-					contextId);
+				_loadedStats = Data::AnyStatistics{ .message = data };
+				fill();
 
 				finishLoading();
 				lifetimeApi->destroy();
@@ -659,6 +600,93 @@ InnerWidget::InnerWidget(
 	}, lifetime());
 }
 
+void InnerWidget::fill() {
+	const auto inner = this;
+	const auto descriptor = Descriptor{
+		_peer,
+		lifetime().make_state<Api::Statistics>(&_peer->session().api()),
+		_controller->uiShow()->toastParent(),
+	};
+	FillOverview(inner, _loadedStats);
+	FillStatistic(inner, descriptor, _loadedStats);
+	const auto &channel = _loadedStats.channel;
+	const auto &supergroup = _loadedStats.supergroup;
+	const auto &message = _loadedStats.message;
+	if (channel) {
+		auto showMessage = [=](FullMsgId fullId) {
+			_showRequests.fire({ .messageStatistic = fullId });
+		};
+		FillRecentPosts(inner, descriptor, channel, showMessage);
+	} else if (supergroup) {
+		const auto showPeerInfo = [=](not_null<PeerData*> peer) {
+			_showRequests.fire({ .info = peer->id });
+		};
+		const auto addSkip = [&](
+				not_null<Ui::VerticalLayout*> c) {
+			::Settings::AddSkip(c);
+			::Settings::AddDivider(c);
+			::Settings::AddSkip(c);
+			::Settings::AddSkip(c);
+		};
+		if (!supergroup.topSenders.empty()) {
+			AddMembersList(
+				{ .topSenders = supergroup.topSenders },
+				inner,
+				showPeerInfo,
+				descriptor.peer,
+				tr::lng_stats_members_title());
+		}
+		if (!supergroup.topAdministrators.empty()) {
+			addSkip(inner);
+			AddMembersList(
+				{ .topAdministrators
+					= supergroup.topAdministrators },
+				inner,
+				showPeerInfo,
+				descriptor.peer,
+				tr::lng_stats_admins_title());
+		}
+		if (!supergroup.topInviters.empty()) {
+			addSkip(inner);
+			AddMembersList(
+				{ .topInviters = supergroup.topInviters },
+				inner,
+				showPeerInfo,
+				descriptor.peer,
+				tr::lng_stats_inviters_title());
+		}
+	} else if (message) {
+		auto showPeerHistory = [=](FullMsgId fullId) {
+			_showRequests.fire({ .history = fullId });
+		};
+		const auto api = lifetime().make_state<Api::MessageStatistics>(
+			descriptor.peer->asChannel(),
+			_contextId);
+		AddPublicForwards(
+			*api,
+			inner,
+			std::move(showPeerHistory),
+			descriptor.peer,
+			_contextId);
+	}
+}
+
+void InnerWidget::saveState(not_null<Memento*> memento) {
+	memento->setStates(base::take(_loadedStats));
+}
+
+void InnerWidget::restoreState(not_null<Memento*> memento) {
+	_loadedStats = memento->states();
+	if (_loadedStats.channel
+		|| _loadedStats.supergroup
+		|| _loadedStats.message) {
+		fill();
+	} else {
+		load();
+	}
+	Ui::RpWidget::resizeToWidth(width());
+}
+
 rpl::producer<Ui::ScrollToRequest> InnerWidget::scrollToRequests() const {
 	return _scrollToRequests.events();
 }

Telegram/SourceFiles/info/statistics/info_statistics_inner_widget.h

@@ -8,6 +8,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #pragma once
 
 #include "base/object_ptr.h"
+#include "data/data_statistics.h"
 #include "ui/widgets/scroll_area.h"
 #include "ui/wrap/vertical_layout.h"
 
@@ -17,6 +18,8 @@ class Controller;
 
 namespace Info::Statistics {
 
+class Memento;
+
 class InnerWidget final : public Ui::VerticalLayout {
 public:
 	struct ShowRequest final {
@@ -39,11 +42,19 @@ public:
 
 	void showFinished();
 
+	void saveState(not_null<Memento*> memento);
+	void restoreState(not_null<Memento*> memento);
+
 private:
+	void load();
+	void fill();
+
 	not_null<Controller*> _controller;
 	not_null<PeerData*> _peer;
 	FullMsgId _contextId;
 
+	Data::AnyStatistics _loadedStats;
+
 	rpl::event_stream<Ui::ScrollToRequest> _scrollToRequests;
 	rpl::event_stream<ShowRequest> _showRequests;
 	rpl::event_stream<> _showFinished;

Telegram/SourceFiles/info/statistics/info_statistics_widget.cpp

@@ -31,11 +31,20 @@ Section Memento::section() const {
 	return Section(Section::Type::Statistics);
 }
 
+void Memento::setStates(Memento::States states) {
+	_states = std::move(states);
+}
+
+Memento::States Memento::states() {
+	return base::take(_states);
+}
+
 object_ptr<ContentWidget> Memento::createWidget(
 		QWidget *parent,
 		not_null<Controller*> controller,
 		const QRect &geometry) {
 	auto result = object_ptr<Widget>(parent, controller);
+	result->setInternalState(geometry, this);
 	return result;
 }
 
@@ -88,6 +97,14 @@ rpl::producer<QString> Widget::title() {
 		: tr::lng_stats_title();
 }
 
+void Widget::setInternalState(
+		const QRect &geometry,
+		not_null<Memento*> memento) {
+	setGeometry(geometry);
+	Ui::SendPendingMoveResizeEvents(this);
+	restoreState(memento);
+}
+
 rpl::producer<bool> Widget::desiredShadowVisibility() const {
 	return rpl::single<bool>(true);
 }
@@ -98,9 +115,20 @@ void Widget::showFinished() {
 
 std::shared_ptr<ContentMemento> Widget::doCreateMemento() {
 	auto result = std::make_shared<Memento>(controller());
+	saveState(result.get());
 	return result;
 }
 
+void Widget::saveState(not_null<Memento*> memento) {
+	memento->setScrollTop(scrollTopSave());
+	_inner->saveState(memento);
+}
+
+void Widget::restoreState(not_null<Memento*> memento) {
+	_inner->restoreState(memento);
+	scrollTopRestore(memento->scrollTop());
+}
+
 std::shared_ptr<Info::Memento> Make(
 		not_null<PeerData*> peer,
 		FullMsgId contextId) {

Telegram/SourceFiles/info/statistics/info_statistics_widget.h

@@ -8,6 +8,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #pragma once
 
 #include "info/info_content_widget.h"
+#include "data/data_statistics.h"
 
 namespace Info::Statistics {
 
@@ -26,6 +27,14 @@ public:
 
 	Section section() const override;
 
+	using States = Data::AnyStatistics;
+
+	void setStates(States states);
+	[[nodiscard]] States states();
+
+private:
+	States _states;
+
 };
 
 class Widget final : public ContentWidget {
@@ -40,7 +49,14 @@ public:
 	[[nodiscard]] not_null<PeerData*> peer() const;
 	[[nodiscard]] FullMsgId contextId() const;
 
+	void setInternalState(
+		const QRect &geometry,
+		not_null<Memento*> memento);
+
 private:
+	void saveState(not_null<Memento*> memento);
+	void restoreState(not_null<Memento*> memento);
+
 	std::shared_ptr<ContentMemento> doCreateMemento() override;
 
 	const not_null<InnerWidget*> _inner;