Allow to create channel invite link in boxes.

SetupChannelBox (public/private) and MaxInviteBox are suggesting
to copy the channel invite link. Now they suggest to create it
in case the channel didn't have the invite link already.

Telegram/SourceFiles/boxes/add_contact_box.cpp

@@ -482,6 +482,11 @@ void SetupChannelBox::prepare() {
 	connect(&_checkTimer, SIGNAL(timeout()), this, SLOT(onCheck()));
 
 	_privacyGroup->setChangedCallback([this](Privacy value) { privacyChanged(value); });
+	subscribe(Notify::PeerUpdated(), Notify::PeerUpdatedHandler(Notify::PeerUpdate::Flag::InviteLinkChanged, [this](const Notify::PeerUpdate &update) {
+		if (update.peer == _channel) {
+			rtlupdate(_invitationLink);
+		}
+	}));
 
 	updateMaxHeight();
 }
@@ -541,7 +546,8 @@ void SetupChannelBox::paintEvent(QPaintEvent *e) {
 			option.setWrapMode(QTextOption::WrapAnywhere);
 			p.setFont(_linkOver ? st::boxTextFont->underline() : st::boxTextFont);
 			p.setPen(st::defaultLinkButton.color);
-			p.drawText(_invitationLink, _channel->inviteLink(), option);
+			auto inviteLinkText = _channel->inviteLink().isEmpty() ? lang(lng_group_invite_create) : _channel->inviteLink();
+			p.drawText(_invitationLink, inviteLinkText, option);
 		}
 	} else {
 		if (!_errorText.isEmpty()) {
@@ -573,8 +579,12 @@ void SetupChannelBox::mouseMoveEvent(QMouseEvent *e) {
 
 void SetupChannelBox::mousePressEvent(QMouseEvent *e) {
 	if (_linkOver) {
-		QGuiApplication::clipboard()->setText(_channel->inviteLink());
+		if (_channel->inviteLink().isEmpty()) {
-		Ui::Toast::Show(lang(lng_create_channel_link_copied));
+			App::api()->exportInviteLink(_channel);
+		} else {
+			QGuiApplication::clipboard()->setText(_channel->inviteLink());
+			Ui::Toast::Show(lang(lng_create_channel_link_copied));
+		}
 	}
 }
 

Telegram/SourceFiles/boxes/confirm_box.cpp

@@ -33,6 +33,7 @@ Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 #include "core/click_handler_types.h"
 #include "storage/localstorage.h"
 #include "auth_session.h"
+#include "observer_peer.h"
 
 TextParseOptions _confirmBoxTextOptions = {
 	TextParseLinks | TextParseMultiline | TextParseRichText, // flags
@@ -216,9 +217,9 @@ InformBox::InformBox(QWidget*, const QString &text, base::lambda<void()> closedC
 InformBox::InformBox(QWidget*, const QString &text, const QString &doneText, base::lambda<void()> closedCallback) : ConfirmBox(ConfirmBox::InformBoxTag(), text, doneText, std::move(closedCallback)) {
 }
 
-MaxInviteBox::MaxInviteBox(QWidget*, const QString &link)
+MaxInviteBox::MaxInviteBox(QWidget*, gsl::not_null<ChannelData*> channel) : BoxContent()
-: _text(st::boxLabelStyle, lng_participant_invite_sorry(lt_count, Global::ChatSizeMax()), _confirmBoxTextOptions, st::boxWidth - st::boxPadding.left() - st::boxButtonPadding.right())
+, _channel(channel)
-, _link(link) {
+, _text(st::boxLabelStyle, lng_participant_invite_sorry(lt_count, Global::ChatSizeMax()), _confirmBoxTextOptions, st::boxWidth - st::boxPadding.left() - st::boxButtonPadding.right()) {
 }
 
 void MaxInviteBox::prepare() {
@@ -229,6 +230,12 @@ void MaxInviteBox::prepare() {
 	_textWidth = st::boxWidth - st::boxPadding.left() - st::boxButtonPadding.right();
 	_textHeight = qMin(_text.countHeight(_textWidth), 16 * st::boxLabelStyle.lineHeight);
 	setDimensions(st::boxWidth, st::boxPadding.top() + _textHeight + st::boxTextFont->height + st::boxTextFont->height * 2 + st::newGroupLinkPadding.bottom());
+
+	subscribe(Notify::PeerUpdated(), Notify::PeerUpdatedHandler(Notify::PeerUpdate::Flag::InviteLinkChanged, [this](const Notify::PeerUpdate &update) {
+		if (update.peer == _channel) {
+			rtlupdate(_invitationLink);
+		}
+	}));
 }
 
 void MaxInviteBox::mouseMoveEvent(QMouseEvent *e) {
@@ -238,8 +245,12 @@ void MaxInviteBox::mouseMoveEvent(QMouseEvent *e) {
 void MaxInviteBox::mousePressEvent(QMouseEvent *e) {
 	mouseMoveEvent(e);
 	if (_linkOver) {
-		Application::clipboard()->setText(_link);
+		if (_channel->inviteLink().isEmpty()) {
-		Ui::Toast::Show(lang(lng_create_channel_link_copied));
+			App::api()->exportInviteLink(_channel);
+		} else {
+			QGuiApplication::clipboard()->setText(_channel->inviteLink());
+			Ui::Toast::Show(lang(lng_create_channel_link_copied));
+		}
 	}
 }
 
@@ -271,7 +282,8 @@ void MaxInviteBox::paintEvent(QPaintEvent *e) {
 	option.setWrapMode(QTextOption::WrapAnywhere);
 	p.setFont(_linkOver ? st::defaultInputField.font->underline() : st::defaultInputField.font);
 	p.setPen(st::defaultLinkButton.color);
-	p.drawText(_invitationLink, _link, option);
+	auto inviteLinkText = _channel->inviteLink().isEmpty() ? lang(lng_group_invite_create) : _channel->inviteLink();
+	p.drawText(_invitationLink, inviteLinkText, option);
 }
 
 void MaxInviteBox::resizeEvent(QResizeEvent *e) {

Telegram/SourceFiles/boxes/confirm_box.h

@@ -100,7 +100,7 @@ public:
 
 class MaxInviteBox : public BoxContent {
 public:
-	MaxInviteBox(QWidget*, const QString &link);
+	MaxInviteBox(QWidget*, gsl::not_null<ChannelData*> channel);
 
 protected:
 	void prepare() override;
@@ -114,10 +114,11 @@ protected:
 private:
 	void updateSelected(const QPoint &cursorGlobalPosition);
 
+	gsl::not_null<ChannelData*> _channel;
+
 	Text _text;
 	int32 _textWidth, _textHeight;
 
-	QString _link;
 	QRect _invitationLink;
 	bool _linkOver = false;
 

Telegram/SourceFiles/boxes/contacts_box.cpp

@@ -1468,7 +1468,7 @@ void ContactsBox::Inner::changeCheckState(ContactData *data, PeerData *peer) {
 	} else if (selectedCount() < ((_channel && _channel->isMegagroup()) ? Global::MegagroupSizeMax() : Global::ChatSizeMax())) {
 		changePeerCheckState(data, peer, true);
 	} else if (_channel && !_channel->isMegagroup()) {
-		Ui::show(Box<MaxInviteBox>(_channel->inviteLink()), KeepOtherLayers);
+		Ui::show(Box<MaxInviteBox>(_channel), KeepOtherLayers);
 	} else if (!_channel && selectedCount() >= Global::ChatSizeMax() && selectedCount() < Global::MegagroupSizeMax()) {
 		Ui::show(Box<InformBox>(lng_profile_add_more_after_upgrade(lt_count, Global::MegagroupSizeMax())), KeepOtherLayers);
 	}

Telegram/SourceFiles/profile/profile_channel_controllers.cpp

@@ -77,7 +77,7 @@ void ParticipantsBoxController::Start(gsl::not_null<ChannelData*> channel, Role
 void ParticipantsBoxController::addNewItem() {
 	if (_role == Role::Members) {
 		if (_channel->membersCount() >= Global::ChatSizeMax()) {
-			Ui::show(Box<MaxInviteBox>(_channel->inviteLink()), KeepOtherLayers);
+			Ui::show(Box<MaxInviteBox>(_channel), KeepOtherLayers);
 		} else {
 			auto already = MembersAlreadyIn();
 			for (auto i = 0, count = delegate()->peerListFullRowsCount(); i != count; ++i) {