Added initial swipe-to-reply to section for replies.

Telegram/SourceFiles/history/view/history_view_list_widget.cpp

@@ -2305,6 +2305,11 @@ void ListWidget::paintUserpics(
 		// paint the userpic if it intersects the painted rect
 		if (userpicTop + st::msgPhotoSize > clip.top()) {
 			const auto item = view->data();
+			const auto hasTranslation = context.gestureHorizontal.ratio
+				&& (context.gestureHorizontal.msgBareId == item->fullId().msg.bare);
+			if (hasTranslation) {
+				p.translate(context.gestureHorizontal.translation, 0);
+			}
 			if (const auto from = item->displayFrom()) {
 				from->paintUserpicLeft(
 					p,
@@ -2337,6 +2342,9 @@ void ListWidget::paintUserpics(
 			} else {
 				Unexpected("Corrupt forwarded information in message.");
 			}
+			if (hasTranslation) {
+				p.translate(-context.gestureHorizontal.translation, 0);
+			}
 		}
 		return true;
 	});

Telegram/SourceFiles/history/view/history_view_replies_section.cpp

@@ -24,6 +24,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history_drag_area.h"
 #include "history/history_item_components.h"
 #include "history/history_item_helpers.h" // GetErrorTextForSending.
+#include "history/history_view_swipe.h"
 #include "ui/chat/pinned_bar.h"
 #include "ui/chat/chat_style.h"
 #include "ui/widgets/buttons.h"
@@ -399,6 +400,7 @@ RepliesWidget::RepliesWidget(
 
 	setupTopicViewer();
 	setupComposeControls();
+	setupSwipeReply();
 	orderWidgets();
 
 	if (_pinnedBar) {
@@ -865,6 +867,62 @@ void RepliesWidget::setupComposeControls() {
 	}
 }
 
+void RepliesWidget::setupSwipeReply() {
+	const auto can = [=](not_null<HistoryItem*> still) {
+		const auto canSendReply = _topic
+			? Data::CanSendAnything(_topic)
+			: Data::CanSendAnything(_history->peer);
+		const auto allowInAnotherChat = still && still->allowsForward();
+		if (allowInAnotherChat && (_joinGroup || !canSendReply)) {
+			return true;
+		} else if (!_joinGroup && canSendReply) {
+			return true;
+		}
+		return false;
+	};
+	HistoryView::SetupSwipeHandler(_inner, _scroll.get(), [=](
+			HistoryView::ChatPaintGestureHorizontalData data) {
+		_gestureHorizontal = data;
+		const auto item = _history->peer->owner().message(
+			_history->peer->id,
+			MsgId{ data.msgBareId });
+		if (item) {
+			_inner->update();
+			// repaintItem(item);
+		}
+	}, [=, show = controller()->uiShow()](int cursorTop) {
+		auto result = HistoryView::SwipeHandlerFinishData();
+		if (_inner->elementInSelectionMode()) {
+			return result;
+		}
+		const auto view = _inner->lookupItemByY(cursorTop);
+		if (!view->data()->isRegular()
+			|| view->data()->isService()) {
+			return result;
+		}
+		if (!can(view->data())) {
+			return result;
+		}
+
+		result.msgBareId = view->data()->fullId().msg.bare;
+		result.callback = [=, itemId = view->data()->fullId()] {
+			const auto still = show->session().data().message(itemId);
+			const auto view = _inner->viewByPosition(still->position());
+			const auto selected = view->selectedQuote(
+				_inner->getSelectedTextRange(still));
+			const auto replyToItemId = (selected.item
+				? selected.item
+				: still)->fullId();
+			_inner->replyToMessageRequestNotify({
+				.messageId = replyToItemId,
+				.quote = selected.text,
+				.quoteOffset = selected.offset,
+			});
+		};
+		return result;
+	});
+}
+
 void RepliesWidget::chooseAttach(
 		std::optional<bool> overrideSendImagesAsPhotos) {
 	_choosingAttach = false;
@@ -2631,6 +2689,14 @@ void RepliesWidget::listAddTranslatedItems(
 	}
 }
 
+Ui::ChatPaintContext RepliesWidget::listPreparePaintContext(
+		Ui::ChatPaintContextArgs &&args) {
+	auto context = WindowListDelegate::listPreparePaintContext(
+		std::move(args));
+	context.gestureHorizontal = _gestureHorizontal;
+	return context;
+}
+
 void RepliesWidget::setupEmptyPainter() {
 	Expects(_topic != nullptr);
 

Telegram/SourceFiles/history/view/history_view_replies_section.h

@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/section_memento.h"
 #include "history/view/history_view_corner_buttons.h"
 #include "history/view/history_view_list_widget.h"
+#include "history/history_view_swipe_data.h"
 #include "data/data_messages.h"
 #include "base/timer.h"
 
@@ -180,6 +181,8 @@ public:
 	History *listTranslateHistory() override;
 	void listAddTranslatedItems(
 		not_null<TranslateTracker*> tracker) override;
+	Ui::ChatPaintContext listPreparePaintContext(
+		Ui::ChatPaintContextArgs &&args) override;
 
 	// CornerButtonsDelegate delegate.
 	void cornerButtonsShowAtPosition(
@@ -221,6 +224,7 @@ private:
 	void finishSending();
 
 	void setupComposeControls();
+	void setupSwipeReply();
 
 	void setupRoot();
 	void setupRootView();
@@ -369,6 +373,8 @@ private:
 	HistoryView::CornerButtons _cornerButtons;
 	rpl::lifetime _topicLifetime;
 
+	HistoryView::ChatPaintGestureHorizontalData _gestureHorizontal;
+
 	int _lastScrollTop = 0;
 	int _topicReopenBarHeight = 0;
 	int _scrollTopDelta = 0;