Add touchscreen preview to recent / channels.

Telegram/SourceFiles/boxes/peer_list_box.cpp

@@ -1556,10 +1556,12 @@ void PeerListContent::handleMouseMove(QPoint globalPosition) {
 	if (_trackPressStart
 		&& ((*_trackPressStart - globalPosition).manhattanLength()
 			> QApplication::startDragDistance())) {
-		_trackPressStart = std::nullopt;
+		_trackPressStart = {};
 		_controller->rowTrackPressCancel();
 	}
-	selectByMouse(globalPosition);
+	if (!_controller->rowTrackPressSkipMouseSelection()) {
+		selectByMouse(globalPosition);
+	}
 }
 
 void PeerListContent::pressLeftToContextMenu(bool shown) {
@@ -1571,13 +1573,24 @@ void PeerListContent::pressLeftToContextMenu(bool shown) {
 	}
 }
 
+bool PeerListContent::trackRowPressFromGlobal(QPoint globalPosition) {
+	selectByMouse(globalPosition);
+	if (const auto row = getRow(_selected.index)) {
+		if (_controller->rowTrackPress(row)) {
+			_trackPressStart = globalPosition;
+			return true;
+		}
+	}
+	return false;
+}
+
 void PeerListContent::mousePressEvent(QMouseEvent *e) {
 	_pressButton = e->button();
 	selectByMouse(e->globalPos());
 	setPressed(_selected);
 	_trackPressStart = {};
-	if (auto row = getRow(_selected.index)) {
-		auto updateCallback = [this, row, hint = _selected.index] {
+	if (const auto row = getRow(_selected.index)) {
+		const auto updateCallback = [this, row, hint = _selected.index] {
 			updateRow(row, hint);
 		};
 		if (_selected.element) {

Telegram/SourceFiles/boxes/peer_list_box.h

@@ -347,7 +347,9 @@ public:
 	virtual void peerListSortRows(Fn<bool(const PeerListRow &a, const PeerListRow &b)> compare) = 0;
 	virtual int peerListPartitionRows(Fn<bool(const PeerListRow &a)> border) = 0;
 	virtual std::shared_ptr<Main::SessionShow> peerListUiShow() = 0;
+
 	virtual void peerListPressLeftToContextMenu(bool shown) = 0;
+	virtual bool peerListTrackRowPressFromGlobal(QPoint globalPosition) = 0;
 
 	template <typename PeerDataRange>
 	void peerListAddSelectedPeers(PeerDataRange &&range) {
@@ -484,6 +486,9 @@ public:
 	}
 	virtual void rowTrackPressCancel() {
 	}
+	virtual bool rowTrackPressSkipMouseSelection() {
+		return false;
+	}
 
 	virtual void loadMoreRows() {
 	}
@@ -663,6 +668,7 @@ public:
 
 	void mouseLeftGeometry();
 	void pressLeftToContextMenu(bool shown);
+	bool trackRowPressFromGlobal(QPoint globalPosition);
 
 	void setSearchMode(PeerListSearchMode mode);
 	void changeCheckState(
@@ -1000,9 +1006,13 @@ public:
 		not_null<PeerListRow*> row,
 		bool highlightRow,
 		Fn<void(not_null<Ui::PopupMenu*>)> destroyed = nullptr) override;
+
 	void peerListPressLeftToContextMenu(bool shown) override {
 		_content->pressLeftToContextMenu(shown);
 	}
+	bool peerListTrackRowPressFromGlobal(QPoint globalPosition) override {
+		return _content->trackRowPressFromGlobal(globalPosition);
+	}
 
 protected:
 	not_null<PeerListContent*> content() const {

Telegram/SourceFiles/dialogs/dialogs_inner_widget.cpp

@@ -1526,7 +1526,7 @@ void InnerWidget::mousePressEvent(QMouseEvent *e) {
 	if (alt && showChatPreview()) {
 		return;
 	} else if (!alt && isUserpicPress()) {
-		scheduleChatPreview();
+		scheduleChatPreview(e->globalPos());
 	}
 
 	if (base::in_range(_collapsedSelected, 0, _collapsedRows.size())) {
@@ -2440,12 +2440,16 @@ void InnerWidget::chatPreviewShown(bool shown, RowDescriptor row) {
 	}
 }
 
-bool InnerWidget::scheduleChatPreview() {
+bool InnerWidget::scheduleChatPreview(QPoint positionOverride) {
 	const auto row = computeChatPreviewRow();
 	const auto callback = crl::guard(this, [=](bool shown) {
 		chatPreviewShown(shown, row);
 	});
-	_chatPreviewScheduled = _controller->scheduleChatPreview(row, callback);
+	_chatPreviewScheduled = _controller->scheduleChatPreview(
+		row,
+		callback,
+		nullptr,
+		positionOverride);
 	return _chatPreviewScheduled;
 }
 
@@ -2544,8 +2548,7 @@ bool InnerWidget::processTouchEvent(not_null<QTouchEvent*> e) {
 			return false;
 		}
 		selectByMouse(*point);
-		const auto onlyUserpic = true;
-		if (isUserpicPress() && scheduleChatPreview()) {
+		if (isUserpicPressOnWide() && scheduleChatPreview(*point)) {
 			_chatPreviewTouchGlobal = point;
 		} else if (!_dragging) {
 			_touchDragStartGlobal = point;

Telegram/SourceFiles/dialogs/dialogs_inner_widget.h

@@ -126,7 +126,7 @@ public:
 	[[nodiscard]] bool isUserpicPress() const;
 	[[nodiscard]] bool isUserpicPressOnWide() const;
 	void cancelChatPreview();
-	bool scheduleChatPreview();
+	bool scheduleChatPreview(QPoint positionOverride);
 	bool showChatPreview();
 	void chatPreviewShown(bool shown, RowDescriptor row = {});
 	bool chooseRow(

Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.cpp

@@ -99,10 +99,17 @@ public:
 
 	bool rowTrackPress(not_null<PeerListRow*> row) override;
 	void rowTrackPressCancel() override;
+	bool rowTrackPressSkipMouseSelection() override;
+
+	bool processTouchEvent(not_null<QTouchEvent*> e);
+	void setupTouchChatPreview(not_null<Ui::ElasticScroll*> scroll);
 
 private:
 	const not_null<Window::SessionController*> _window;
 
+	std::optional<QPoint> _chatPreviewTouchGlobal;
+	rpl::event_stream<> _touchCancelRequests;
+
 };
 
 class RecentsController final : public ControllerWithPreviews {
@@ -426,22 +433,81 @@ bool ControllerWithPreviews::rowTrackPress(not_null<PeerListRow*> row) {
 		delegate()->peerListPressLeftToContextMenu(shown);
 	});
 	if (base::IsAltPressed()) {
-		_window->showChatPreview({ history, FullMsgId() }, callback);
+		_window->showChatPreview(
+			{ history, FullMsgId() },
+			callback,
+			nullptr,
+			_chatPreviewTouchGlobal);
 		return false;
 	}
 	const auto point = delegate()->peerListLastRowMousePosition();
 	const auto &st = computeListSt().item;
 	if (point && point->x() < st.photoPosition.x() + st.photoSize) {
-		_window->scheduleChatPreview({ history, FullMsgId() }, callback);
+		_window->scheduleChatPreview(
+			{ history, FullMsgId() },
+			callback,
+			nullptr,
+			_chatPreviewTouchGlobal);
 		return true;
 	}
 	return false;
 }
 
 void ControllerWithPreviews::rowTrackPressCancel() {
+	_chatPreviewTouchGlobal = {};
 	_window->cancelScheduledPreview();
 }
 
+bool ControllerWithPreviews::rowTrackPressSkipMouseSelection() {
+	return _chatPreviewTouchGlobal.has_value();
+}
+
+bool ControllerWithPreviews::processTouchEvent(not_null<QTouchEvent*> e) {
+	const auto point = e->touchPoints().empty()
+		? std::optional<QPoint>()
+		: e->touchPoints().front().screenPos().toPoint();
+	switch (e->type()) {
+	case QEvent::TouchBegin: {
+		if (!point) {
+			return false;
+		}
+		_chatPreviewTouchGlobal = point;
+		if (!delegate()->peerListTrackRowPressFromGlobal(*point)) {
+			_chatPreviewTouchGlobal = {};
+		}
+	} break;
+
+	case QEvent::TouchUpdate: {
+		if (!point) {
+			return false;
+		}
+		if (_chatPreviewTouchGlobal) {
+			const auto delta = (*_chatPreviewTouchGlobal - *point);
+			if (delta.manhattanLength() > computeListSt().item.photoSize) {
+				rowTrackPressCancel();
+			}
+		}
+	} break;
+
+	case QEvent::TouchEnd:
+	case QEvent::TouchCancel: {
+		if (_chatPreviewTouchGlobal) {
+			rowTrackPressCancel();
+		}
+	} break;
+	}
+	return false;
+}
+
+void ControllerWithPreviews::setupTouchChatPreview(
+		not_null<Ui::ElasticScroll*> scroll) {
+	_touchCancelRequests.events() | rpl::start_with_next([=] {
+		QTouchEvent ev(QEvent::TouchCancel);
+		ev.setTimestamp(crl::now());
+		QGuiApplication::sendEvent(scroll, &ev);
+	}, lifetime());
+}
+
 RecentsController::RecentsController(
 	not_null<Window::SessionController*> window,
 	RecentPeersList list)
@@ -1030,6 +1096,7 @@ void Suggestions::setupChats() {
 	}, _topPeers->lifetime());
 
 	_chatsScroll->setVisible(_tab.current() == Tab::Chats);
+	_chatsScroll->setCustomTouchProcess(_recentProcessTouch);
 }
 
 void Suggestions::handlePressForChatPreview(
@@ -1063,6 +1130,11 @@ void Suggestions::setupChannels() {
 		anim::type::instant);
 
 	_channelsScroll->setVisible(_tab.current() == Tab::Channels);
+	_channelsScroll->setCustomTouchProcess([=](not_null<QTouchEvent*> e) {
+		const auto myChannels = _myChannelsProcessTouch(e);
+		const auto recommendations = _recommendationsProcessTouch(e);
+		return myChannels || recommendations;
+	});
 }
 
 void Suggestions::selectJump(Qt::Key direction, int pageSize) {
@@ -1371,6 +1443,9 @@ object_ptr<Ui::SlideWrap<>> Suggestions::setupRecentPeers(
 	controller->setStyleOverrides(&st::recentPeersList);
 
 	_recentCount = controller->count();
+	_recentProcessTouch = [=](not_null<QTouchEvent*> e) {
+		return controller->processTouchEvent(e);
+	};
 
 	controller->chosen(
 	) | rpl::start_with_next([=](not_null<PeerData*> peer) {
@@ -1419,6 +1494,7 @@ object_ptr<Ui::SlideWrap<>> Suggestions::setupRecentPeers(
 
 	delegate->setContent(raw);
 	controller->setDelegate(delegate);
+	controller->setupTouchChatPreview(_chatsScroll.get());
 
 	return object_ptr<Ui::SlideWrap<>>(this, std::move(content));
 }
@@ -1474,6 +1550,9 @@ object_ptr<Ui::SlideWrap<>> Suggestions::setupMyChannels() {
 	controller->setStyleOverrides(&st::recentPeersList);
 
 	_myChannelsCount = controller->count();
+	_myChannelsProcessTouch = [=](not_null<QTouchEvent*> e) {
+		return controller->processTouchEvent(e);
+	};
 
 	controller->chosen(
 	) | rpl::start_with_next([=](not_null<PeerData*> peer) {
@@ -1535,6 +1614,7 @@ object_ptr<Ui::SlideWrap<>> Suggestions::setupMyChannels() {
 
 	delegate->setContent(raw);
 	controller->setDelegate(delegate);
+	controller->setupTouchChatPreview(_channelsScroll.get());
 
 	return object_ptr<Ui::SlideWrap<>>(this, std::move(content));
 }
@@ -1549,6 +1629,9 @@ object_ptr<Ui::SlideWrap<>> Suggestions::setupRecommendations() {
 	controller->setStyleOverrides(&st::recentPeersList);
 
 	_recommendationsCount = controller->count();
+	_recommendationsProcessTouch = [=](not_null<QTouchEvent*> e) {
+		return controller->processTouchEvent(e);
+	};
 
 	_tab.value() | rpl::filter(
 		rpl::mappers::_1 == Tab::Channels
@@ -1603,6 +1686,7 @@ object_ptr<Ui::SlideWrap<>> Suggestions::setupRecommendations() {
 
 	delegate->setContent(raw);
 	controller->setDelegate(delegate);
+	controller->setupTouchChatPreview(_channelsScroll.get());
 
 	return object_ptr<Ui::SlideWrap<>>(this, std::move(content));
 }

Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.h

@@ -139,6 +139,7 @@ private:
 	Fn<JumpResult(Qt::Key, int)> _recentSelectJump;
 	Fn<uint64(QPoint)> _recentUpdateFromParentDrag;
 	Fn<void()> _recentDragLeft;
+	Fn<bool(not_null<QTouchEvent*>)> _recentProcessTouch;
 	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _recentPeers;
 	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _emptyRecent;
 
@@ -150,6 +151,7 @@ private:
 	Fn<JumpResult(Qt::Key, int)> _myChannelsSelectJump;
 	Fn<uint64(QPoint)> _myChannelsUpdateFromParentDrag;
 	Fn<void()> _myChannelsDragLeft;
+	Fn<bool(not_null<QTouchEvent*>)> _myChannelsProcessTouch;
 	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _myChannels;
 
 	rpl::variable<int> _recommendationsCount;
@@ -157,6 +159,7 @@ private:
 	Fn<JumpResult(Qt::Key, int)> _recommendationsSelectJump;
 	Fn<uint64(QPoint)> _recommendationsUpdateFromParentDrag;
 	Fn<void()> _recommendationsDragLeft;
+	Fn<bool(not_null<QTouchEvent*>)> _recommendationsProcessTouch;
 	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _recommendations;
 
 	const not_null<Ui::SlideWrap<Ui::RpWidget>*> _emptyChannels;

Telegram/SourceFiles/window/window_chat_preview.cpp

@@ -34,7 +34,8 @@ ChatPreviewManager::ChatPreviewManager(
 bool ChatPreviewManager::show(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback,
-		QPointer<QWidget> parentOverride) {
+		QPointer<QWidget> parentOverride,
+		std::optional<QPoint> positionOverride) {
 	cancelScheduled();
 	_topicLifetime.destroy();
 	if (const auto topic = row.key.topic()) {
@@ -94,7 +95,7 @@ bool ChatPreviewManager::show(
 	if (callback) {
 		callback(true);
 	}
-	_menu->popup(QCursor::pos());
+	_menu->popup(positionOverride.value_or(QCursor::pos()));
 
 	return true;
 }
@@ -102,7 +103,8 @@ bool ChatPreviewManager::show(
 bool ChatPreviewManager::schedule(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback,
-		QPointer<QWidget> parentOverride) {
+		QPointer<QWidget> parentOverride,
+		std::optional<QPoint> positionOverride) {
 	cancelScheduled();
 	_topicLifetime.destroy();
 	if (const auto topic = row.key.topic()) {
@@ -116,17 +118,23 @@ bool ChatPreviewManager::schedule(
 	_scheduled = std::move(row);
 	_scheduledCallback = std::move(callback);
 	_scheduledParentOverride = std::move(parentOverride);
+	_scheduledPositionOverride = positionOverride;
 	_timer.callOnce(kChatPreviewDelay);
 	return true;
 }
 
 void ChatPreviewManager::showScheduled() {
-	show(base::take(_scheduled), base::take(_scheduledCallback));
+	show(
+		base::take(_scheduled),
+		base::take(_scheduledCallback),
+		nullptr,
+		base::take(_scheduledPositionOverride));
 }
 
 void ChatPreviewManager::cancelScheduled() {
 	_scheduled = {};
 	_scheduledCallback = nullptr;
+	_scheduledPositionOverride = {};
 	_timer.cancel();
 }
 

Telegram/SourceFiles/window/window_chat_preview.h

@@ -26,11 +26,13 @@ public:
 	bool show(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback = nullptr,
-		QPointer<QWidget> parentOverride = nullptr);
+		QPointer<QWidget> parentOverride = nullptr,
+		std::optional<QPoint> positionOverride = {});
 	bool schedule(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback = nullptr,
-		QPointer<QWidget> parentOverride = nullptr);
+		QPointer<QWidget> parentOverride = nullptr,
+		std::optional<QPoint> positionOverride = {});
 	void cancelScheduled();
 
 private:
@@ -40,6 +42,7 @@ private:
 	Dialogs::RowDescriptor _scheduled;
 	Fn<void(bool)> _scheduledCallback;
 	QPointer<QWidget> _scheduledParentOverride;
+	std::optional<QPoint> _scheduledPositionOverride;
 	base::Timer _timer;
 
 	rpl::lifetime _topicLifetime;

Telegram/SourceFiles/window/window_session_controller.cpp

@@ -2979,21 +2979,25 @@ QString SessionController::premiumRef() const {
 bool SessionController::showChatPreview(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback,
-		QPointer<QWidget> parentOverride) {
+		QPointer<QWidget> parentOverride,
+		std::optional<QPoint> positionOverride) {
 	return _chatPreviewManager->show(
 		std::move(row),
 		std::move(callback),
-		std::move(parentOverride));
+		std::move(parentOverride),
+		positionOverride);
 }
 
 bool SessionController::scheduleChatPreview(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback,
-		QPointer<QWidget> parentOverride) {
+	QPointer<QWidget> parentOverride,
+	std::optional<QPoint> positionOverride) {
 	return _chatPreviewManager->schedule(
 		std::move(row),
 		std::move(callback),
-		std::move(parentOverride));
+		std::move(parentOverride),
+		positionOverride);
 }
 
 void SessionController::cancelScheduledPreview() {

Telegram/SourceFiles/window/window_session_controller.h

@@ -604,11 +604,13 @@ public:
 	bool showChatPreview(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback = nullptr,
-		QPointer<QWidget> parentOverride = nullptr);
+		QPointer<QWidget> parentOverride = nullptr,
+		std::optional<QPoint> positionOverride = {});
 	bool scheduleChatPreview(
 		Dialogs::RowDescriptor row,
 		Fn<void(bool shown)> callback = nullptr,
-		QPointer<QWidget> parentOverride = nullptr);
+		QPointer<QWidget> parentOverride = nullptr,
+		std::optional<QPoint> positionOverride = {});
 	void cancelScheduledPreview();
 
 	[[nodiscard]] bool contentOverlapped(QWidget *w, QPaintEvent *e) const;