Handle join-to-write / request-to-join in comments section.

Telegram/SourceFiles/data/data_channel.cpp

@@ -467,7 +467,8 @@ bool ChannelData::canPublish() const {
 
 bool ChannelData::canWrite() const {
 	// Duplicated in Data::CanWriteValue().
-	const auto allowed = amIn() || (flags() & Flag::HasLink);
+	const auto allowed = amIn()
+		|| ((flags() & Flag::HasLink) && !(flags() & Flag::JoinToWrite));
 	return allowed && (canPublish()
 			|| (!isBroadcast()
 				&& !amRestricted(Restriction::SendMessages)));

Telegram/SourceFiles/data/data_peer_values.cpp

@@ -205,6 +205,7 @@ rpl::producer<bool> CanWriteValue(ChannelData *channel) {
 	using Flag = ChannelDataFlag;
 	const auto mask = 0
 		| Flag::Left
+		| Flag::JoinToWrite
 		| Flag::HasLink
 		| Flag::Forbidden
 		| Flag::Creator
@@ -227,7 +228,7 @@ rpl::producer<bool> CanWriteValue(ChannelData *channel) {
 				bool defaultSendMessagesRestriction) {
 			const auto notAmInFlags = Flag::Left | Flag::Forbidden;
 			const auto allowed = !(flags & notAmInFlags)
-				|| (flags & Flag::HasLink);
+				|| ((flags & Flag::HasLink) && !(flags & Flag::JoinToWrite));
 			return allowed && (postMessagesRight
 					|| (flags & Flag::Creator)
 					|| (!(flags & Flag::Broadcast)

Telegram/SourceFiles/history/view/controls/history_view_compose_controls.cpp

@@ -1215,6 +1215,19 @@ void ComposeControls::checkAutocomplete() {
 		autocomplete.fromStart);
 }
 
+void ComposeControls::hide() {
+	showStarted();
+	_hidden = true;
+}
+
+void ComposeControls::show() {
+	if (_hidden.current()) {
+		_hidden = false;
+		showFinished();
+		checkAutocomplete();
+	}
+}
+
 void ComposeControls::init() {
 	initField();
 	initTabbedSelector();
@@ -1224,6 +1237,11 @@ void ComposeControls::init() {
 	initVoiceRecordBar();
 	initKeyHandler();
 
+	_hidden.changes(
+	) | rpl::start_with_next([=] {
+		updateWrappingVisibility();
+	}, _wrap->lifetime());
+
 	_botCommandStart->setClickedCallback([=] { setText({ "/" }); });
 
 	_wrap->sizeValue(
@@ -2021,10 +2039,11 @@ void ComposeControls::initVoiceRecordBar() {
 }
 
 void ComposeControls::updateWrappingVisibility() {
+	const auto hidden = _hidden.current();
 	const auto restricted = _writeRestriction.current().has_value();
-	_writeRestricted->setVisible(restricted);
-	_wrap->setVisible(!restricted);
-	if (!restricted) {
+	_writeRestricted->setVisible(!hidden && restricted);
+	_wrap->setVisible(!hidden && !restricted);
+	if (!hidden && !restricted) {
 		_wrap->raise();
 	}
 }

Telegram/SourceFiles/history/view/controls/history_view_compose_controls.h

@@ -169,6 +169,9 @@ public:
 	void hidePanelsAnimated();
 	void clearListenState();
 
+	void hide();
+	void show();
+
 	[[nodiscard]] rpl::producer<bool> lockShowStarts() const;
 	[[nodiscard]] bool isLockPresent() const;
 	[[nodiscard]] bool isRecording() const;
@@ -285,6 +288,7 @@ private:
 	rpl::variable<int> _slowmodeSecondsLeft;
 	rpl::variable<bool> _sendDisabledBySlowmode;
 	rpl::variable<std::optional<QString>> _writeRestriction;
+	rpl::variable<bool> _hidden;
 	Mode _mode = Mode::Normal;
 
 	const std::unique_ptr<Ui::RpWidget> _wrap;

Telegram/SourceFiles/history/view/history_view_replies_section.cpp

@@ -231,7 +231,9 @@ RepliesWidget::RepliesWidget(
 	}, lifetime());
 
 	_inner->editMessageRequested(
-	) | rpl::start_with_next([=](auto fullId) {
+	) | rpl::filter([=] {
+		return !_joinGroup;
+	}) | rpl::start_with_next([=](auto fullId) {
 		if (const auto item = session().data().message(fullId)) {
 			const auto media = item->media();
 			if (media && !media->webpage()) {
@@ -245,7 +247,9 @@ RepliesWidget::RepliesWidget(
 	}, _inner->lifetime());
 
 	_inner->replyToMessageRequested(
-	) | rpl::start_with_next([=](auto fullId) {
+	) | rpl::filter([=] {
+		return !_joinGroup;
+	}) | rpl::start_with_next([=](auto fullId) {
 		replyToMessage(fullId);
 	}, _inner->lifetime());
 
@@ -477,13 +481,20 @@ void RepliesWidget::setupComposeControls() {
 			std::move(hasSendingMessage),
 			_1 && _2);
 
-	auto writeRestriction = session().changes().peerFlagsValue(
-		_history->peer,
-		Data::PeerUpdate::Flag::Rights
+	auto writeRestriction = rpl::combine(
+		session().changes().peerFlagsValue(
+			_history->peer,
+			Data::PeerUpdate::Flag::Rights),
+		Data::CanWriteValue(_history->peer)
 	) | rpl::map([=] {
-		return Data::RestrictionError(
+		const auto restriction = Data::RestrictionError(
 			_history->peer,
 			ChatRestriction::SendMessages);
+		return restriction
+			? restriction
+			: _history->peer->canWrite()
+			? std::optional<QString>()
+			: tr::lng_group_not_accessible(tr::now);
 	});
 
 	_composeControls->setHistory({
@@ -495,7 +506,9 @@ void RepliesWidget::setupComposeControls() {
 	});
 
 	_composeControls->height(
-	) | rpl::start_with_next([=] {
+	) | rpl::filter([=] {
+		return !_joinGroup;
+	}) | rpl::start_with_next([=] {
 		const auto wasMax = (_scroll->scrollTopMax() == _scroll->scrollTop());
 		updateControlsGeometry();
 		if (wasMax) {
@@ -617,6 +630,20 @@ void RepliesWidget::setupComposeControls() {
 	}, lifetime());
 
 	_composeControls->finishAnimating();
+
+	if (const auto channel = _history->peer->asChannel()) {
+		channel->updateFull();
+		if (!channel->isBroadcast()) {
+			rpl::combine(
+				Data::CanWriteValue(channel),
+				channel->flagsValue()
+			) | rpl::start_with_next([=] {
+				refreshJoinGroupButton();
+			}, lifetime());
+		} else {
+			refreshJoinGroupButton();
+		}
+	}
 }
 
 void RepliesWidget::chooseAttach() {
@@ -1066,6 +1093,47 @@ void RepliesWidget::edit(
 	doSetInnerFocus();
 }
 
+void RepliesWidget::refreshJoinGroupButton() {
+	const auto set = [&](std::unique_ptr<Ui::FlatButton> button) {
+		if (!button && !_joinGroup) {
+			return;
+		}
+		const auto atMax = (_scroll->scrollTopMax() == _scroll->scrollTop());
+		_joinGroup = std::move(button);
+		if (!animatingShow()) {
+			if (button) {
+				button->show();
+				_composeControls->hide();
+			} else {
+				_composeControls->show();
+			}
+		}
+		updateControlsGeometry();
+		if (atMax) {
+			listScrollTo(_scroll->scrollTopMax());
+		}
+	};
+	const auto channel = _history->peer->asChannel();
+	if (channel->amIn() || !channel->joinToWrite() || channel->amCreator()) {
+		set(nullptr);
+	} else {
+		if (!_joinGroup) {
+			set(std::make_unique<Ui::FlatButton>(
+				this,
+				QString(),
+				st::historyComposeButton));
+			_joinGroup->setClickedCallback([=] {
+				session().api().joinChannel(channel);
+			});
+		}
+		_joinGroup->setText((channel->isBroadcast()
+			? tr::lng_profile_join_channel(tr::now)
+			: (channel->requestToJoin() && !channel->amCreator())
+			? tr::lng_profile_apply_to_join_group(tr::now)
+			: tr::lng_profile_join_group(tr::now)).toUpper());
+	}
+}
+
 void RepliesWidget::sendExistingDocument(
 		not_null<DocumentData*> document) {
 	sendExistingDocument(document, {}, std::nullopt);
@@ -1430,7 +1498,11 @@ bool RepliesWidget::preventsClose(Fn<void()> &&continueCallback) const {
 QPixmap RepliesWidget::grabForShowAnimation(const Window::SectionSlideParams &params) {
 	_topBar->updateControlsVisibility();
 	if (params.withTopBarShadow) _topBarShadow->hide();
-	_composeControls->showForGrab();
+	if (_joinGroup) {
+		_composeControls->hide();
+	} else {
+		_composeControls->showForGrab();
+	}
 	auto result = Ui::GrabWidget(this);
 	if (params.withTopBarShadow) _topBarShadow->show();
 	_rootView->hide();
@@ -1605,7 +1677,9 @@ void RepliesWidget::updateControlsGeometry() {
 	_rootView->resizeToWidth(contentWidth);
 
 	const auto bottom = height();
-	const auto controlsHeight = _composeControls->heightCurrent();
+	const auto controlsHeight = _joinGroup
+		? _joinGroup->height()
+		: _composeControls->heightCurrent();
 	const auto scrollY = _topBar->height() + _rootViewHeight;
 	const auto scrollHeight = bottom - scrollY - controlsHeight;
 	const auto scrollSize = QSize(contentWidth, scrollHeight);
@@ -1622,6 +1696,13 @@ void RepliesWidget::updateControlsGeometry() {
 		}
 		updateInnerVisibleArea();
 	}
+	if (_joinGroup) {
+		_joinGroup->setGeometry(
+			0,
+			bottom - _joinGroup->height(),
+			contentWidth,
+			_joinGroup->height());
+	}
 	_composeControls->move(0, bottom - controlsHeight);
 	_composeControls->setAutocompleteBoundingRect(_scroll->geometry());
 
@@ -1715,7 +1796,11 @@ void RepliesWidget::showAnimatedHook(
 
 void RepliesWidget::showFinishedHook() {
 	_topBar->setAnimatingMode(false);
-	_composeControls->showFinished();
+	if (_joinGroup) {
+		_composeControls->hide();
+	} else {
+		_composeControls->showFinished();
+	}
 	_rootView->show();
 
 	// We should setup the drag area only after

Telegram/SourceFiles/history/view/history_view_replies_section.h

@@ -260,6 +260,7 @@ private:
 		Api::SendOptions options,
 		std::optional<MsgId> localMessageId);
 
+	void refreshJoinGroupButton();
 	[[nodiscard]] bool showSlowmodeError();
 	[[nodiscard]] std::optional<QString> writeRestriction() const;
 
@@ -274,6 +275,7 @@ private:
 	object_ptr<TopBarWidget> _topBar;
 	object_ptr<Ui::PlainShadow> _topBarShadow;
 	std::unique_ptr<ComposeControls> _composeControls;
+	std::unique_ptr<Ui::FlatButton> _joinGroup;
 	bool _skipScrollEvent = false;
 
 	std::unique_ptr<Ui::PinnedBar> _rootView;