Added ability to swipe-to-back to other sections.

Telegram/CMakeLists.txt

@@ -919,6 +919,8 @@ PRIVATE
     history/history_unread_things.h
     history/history_view_highlight_manager.cpp
     history/history_view_highlight_manager.h
+    history/history_view_swipe_back_session.cpp
+    history/history_view_swipe_back_session.h
     history/history_widget.cpp
     history/history_widget.h
     info/bot/earn/info_bot_earn_list.cpp

Telegram/SourceFiles/history/history_view_swipe_back_session.cpp

@@ -0,0 +1,55 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "history/history_view_swipe_back_session.h"
+
+#include "history/history_view_swipe_data.h"
+#include "history/history_view_swipe.h"
+#include "history/view/history_view_list_widget.h"
+#include "ui/chat/chat_style.h"
+#include "window/window_session_controller.h"
+
+namespace Window {
+
+void SetupSwipeBackSection(
+		not_null<Ui::RpWidget*> parent,
+		not_null<Ui::ScrollArea*> scroll,
+		not_null<HistoryView::ListWidget*> list) {
+	const auto swipeBackData
+		= list->lifetime().make_state<HistoryView::SwipeBackResult>();
+	HistoryView::SetupSwipeHandler(parent, scroll, [=](
+			HistoryView::ChatPaintGestureHorizontalData data) {
+		if (data.translation > 0) {
+			if (!swipeBackData->callback) {
+				const auto color = [=]() -> std::pair<QColor, QColor> {
+					const auto c = list->delegate()->listPreparePaintContext({
+						.theme = list->delegate()->listChatTheme(),
+					});
+					return {
+						c.st->msgServiceBg()->c,
+						c.st->msgServiceFg()->c,
+					};
+				};
+				(*swipeBackData) = HistoryView::SetupSwipeBack(parent, color);
+			}
+			swipeBackData->callback(data);
+			return;
+		} else if (swipeBackData->lifetime) {
+			(*swipeBackData) = {};
+		}
+	}, [=](int, Qt::LayoutDirection direction) {
+		if (direction != Qt::RightToLeft) {
+			return HistoryView::SwipeHandlerFinishData();
+		}
+		return HistoryView::SwipeHandlerFinishData{
+			.callback = [=] { list->controller()->showBackFromStack(); },
+			.msgBareId = HistoryView::kMsgBareIdSwipeBack,
+		};
+	}, list->touchMaybeSelectingValue());
+}
+
+} // namespace Window

Telegram/SourceFiles/history/history_view_swipe_back_session.h

@@ -0,0 +1,30 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+class WindowListDelegate;
+
+namespace HistoryView {
+class ListWidget;
+} // namespace HistoryView
+
+namespace Ui {
+class RpWidget;
+class ScrollArea;
+} // namespace Ui
+
+namespace Window {
+
+class SectionWidget;
+
+void SetupSwipeBackSection(
+	not_null<Ui::RpWidget*> parent,
+	not_null<Ui::ScrollArea*> scroll,
+	not_null<HistoryView::ListWidget*> list);
+
+} // namespace Window

Telegram/SourceFiles/history/view/history_view_pinned_section.cpp

@@ -13,6 +13,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history.h"
 #include "history/history_item_components.h"
 #include "history/history_item.h"
+#include "history/history_view_swipe_back_session.h"
 #include "ui/boxes/confirm_box.h"
 #include "ui/widgets/scroll_area.h"
 #include "ui/widgets/shadow.h"
@@ -173,6 +174,7 @@ PinnedWidget::PinnedWidget(
 
 	setupClearButton();
 	setupTranslateBar();
+	Window::SetupSwipeBackSection(this, _scroll.get(), _inner);
 }
 
 PinnedWidget::~PinnedWidget() = default;

Telegram/SourceFiles/history/view/history_view_scheduled_section.cpp

@@ -15,6 +15,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/history.h"
 #include "history/history_drag_area.h"
 #include "history/history_item_helpers.h" // GetErrorForSending.
+#include "history/history_view_swipe_back_session.h"
 #include "menu/menu_send.h" // SendMenu::Type.
 #include "ui/widgets/buttons.h"
 #include "ui/widgets/tooltip.h"
@@ -245,6 +246,7 @@ ScheduledWidget::ScheduledWidget(
 		_inner->setEmptyInfoWidget(std::move(emptyInfo));
 	}
 	setupComposeControls();
+	Window::SetupSwipeBackSection(this, _scroll, _inner);
 }
 
 ScheduledWidget::~ScheduledWidget() = default;

Telegram/SourceFiles/history/view/history_view_sublist_section.cpp

@@ -22,6 +22,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "history/view/history_view_list_widget.h"
 #include "history/history.h"
 #include "history/history_item.h"
+#include "history/history_view_swipe_back_session.h"
 #include "lang/lang_keys.h"
 #include "ui/chat/chat_style.h"
 #include "ui/widgets/buttons.h"
@@ -146,6 +147,7 @@ SublistWidget::SublistWidget(
 
 	setupShortcuts();
 	setupTranslateBar();
+	Window::SetupSwipeBackSection(this, _scroll.get(), _inner);
 }
 
 SublistWidget::~SublistWidget() = default;