From 9a439e1941592c8b2ed253bdf5a26b1aa8a3fb51 Mon Sep 17 00:00:00 2001
From: 23rd <23rd@vivaldi.net>
Date: Mon, 24 Mar 2025 22:22:48 +0300
Subject: [PATCH] Added ability to switch tabs in dialogs suggestions with
 swipe.

---
 .../dialogs/ui/dialogs_suggestions.cpp        | 68 +++++++++++++++++++
 .../dialogs/ui/dialogs_suggestions.h          | 10 +++
 2 files changed, 78 insertions(+)

diff --git a/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.cpp b/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.cpp
index d13f336f93..28511ebe55 100644
--- a/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.cpp
+++ b/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.cpp
@@ -36,6 +36,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "settings/settings_common.h"
 #include "storage/storage_shared_media.h"
 #include "ui/boxes/confirm_box.h"
+#include "ui/controls/swipe_handler.h"
 #include "ui/effects/ripple_animation.h"
 #include "ui/text/text_utilities.h"
 #include "ui/widgets/menu/menu_add_action_callback_factory.h"
@@ -1552,6 +1553,61 @@ void Suggestions::setupApps() {
 	});
 }
 
+Ui::Controls::SwipeHandlerArgs Suggestions::generateIncompleteSwipeArgs() {
+	_swipeLifetime.destroy();
+
+	auto update = [=](Ui::Controls::SwipeContextData data) {
+		if (data.translation != 0) {
+			if (!_swipeBackData.callback) {
+				_swipeBackData = Ui::Controls::SetupSwipeBack(
+					this,
+					[=]() -> std::pair<QColor, QColor> {
+						return {
+							st::historyForwardChooseBg->c,
+							st::historyForwardChooseFg->c,
+						};
+					},
+					data.translation < 0);
+			}
+			_swipeBackData.callback(data);
+			return;
+		} else if (_swipeBackData.lifetime) {
+			_swipeBackData = {};
+		}
+	};
+	auto init = [=](int, Qt::LayoutDirection direction) {
+		if (!_tabs) {
+			return Ui::Controls::SwipeHandlerFinishData();
+		}
+		const auto activeSection = _tabs->activeSection();
+		const auto isToLeft = direction == Qt::RightToLeft;
+		if ((isToLeft && activeSection > 0)
+			|| (!isToLeft && activeSection < _tabKeys.size() - 1)) {
+			return Ui::Controls::DefaultSwipeBackHandlerFinishData([=] {
+				if (_tabs
+					&& _tabs->activeSection() == activeSection) {
+					_swipeBackData = {};
+					_tabs->setActiveSection(isToLeft
+						? activeSection - 1
+						: activeSection + 1);
+				}
+			});
+		}
+		return Ui::Controls::SwipeHandlerFinishData();
+	};
+	return { .widget = this, .update = update, .init = init };
+}
+
+void Suggestions::reinstallSwipe(not_null<Ui::ElasticScroll*> scroll) {
+	_swipeLifetime.destroy();
+
+	auto args = generateIncompleteSwipeArgs();
+	args.scroll = scroll;
+	args.onLifetime = &_swipeLifetime;
+
+	Ui::Controls::SetupSwipeHandler(std::move(args));
+}
+
 void Suggestions::selectJump(Qt::Key direction, int pageSize) {
 	switch (_key.current().tab) {
 	case Tab::Chats: selectJumpChats(direction, pageSize); return;
@@ -1977,6 +2033,18 @@ void Suggestions::finishShow() {
 	_appsScroll->setVisible(key == Key{ Tab::Apps });
 	for (const auto &[mediaKey, list] : _mediaLists) {
 		list.wrap->setVisible(key == mediaKey);
+		if (key == mediaKey) {
+			_swipeLifetime.destroy();
+			auto incomplete = generateIncompleteSwipeArgs();
+			list.wrap->replaceSwipeHandler(&incomplete);
+		}
+	}
+	if (key == Key{ Tab::Chats }) {
+		reinstallSwipe(_chatsScroll.get());
+	} else if (key == Key{ Tab::Channels }) {
+		reinstallSwipe(_channelsScroll.get());
+	} else if (key == Key{ Tab::Apps }) {
+		reinstallSwipe(_appsScroll.get());
 	}
 }
 
diff --git a/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.h b/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.h
index 0d8d1df729..f269085f13 100644
--- a/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.h
+++ b/Telegram/SourceFiles/dialogs/ui/dialogs_suggestions.h
@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "base/object_ptr.h"
 #include "base/timer.h"
 #include "dialogs/ui/top_peers_strip.h"
+#include "ui/controls/swipe_handler_data.h"
 #include "ui/effects/animations.h"
 #include "ui/rp_widget.h"
 
@@ -32,6 +33,9 @@ enum class SharedMediaType : signed char;
 } // namespace Storage
 
 namespace Ui {
+namespace Controls {
+struct SwipeHandlerArgs;
+} // namespace Controls
 class BoxContent;
 class ScrollArea;
 class ElasticScroll;
@@ -157,6 +161,9 @@ private:
 	void setupChats();
 	void setupChannels();
 	void setupApps();
+	void reinstallSwipe(not_null<Ui::ElasticScroll*>);
+	[[nodiscard]] auto generateIncompleteSwipeArgs()
+	-> Ui::Controls::SwipeHandlerArgs;
 
 	void selectJumpChats(Qt::Key direction, int pageSize);
 	void selectJumpChannels(Qt::Key direction, int pageSize);
@@ -253,6 +260,9 @@ private:
 	QPixmap _slideLeft;
 	QPixmap _slideRight;
 
+	Ui::Controls::SwipeBackResult _swipeBackData;
+	rpl::lifetime _swipeLifetime;
+
 	int _slideLeftTop = 0;
 	int _slideRightTop = 0;