Added ability to swipe-to-back to admin log section.

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.cpp

@@ -1039,6 +1039,16 @@ void InnerWidget::restoreScrollPosition() {
 	_scrollToSignal.fire_copy(newVisibleTop);
 }
 
+Ui::ChatPaintContext InnerWidget::preparePaintContext(QRect clip) const {
+	return _controller->preparePaintContext({
+		.theme = _theme.get(),
+		.clip = clip,
+		.visibleAreaPositionGlobal = mapToGlobal(QPoint(0, _visibleTop)),
+		.visibleAreaTop = _visibleTop,
+		.visibleAreaWidth = width(),
+	});
+}
+
 void InnerWidget::paintEvent(QPaintEvent *e) {
 	if (_controller->contentOverlapped(this, e)) {
 		return;
@@ -1051,13 +1061,7 @@ void InnerWidget::paintEvent(QPaintEvent *e) {
 	Painter p(this);
 
 	auto clip = e->rect();
-	auto context = _controller->preparePaintContext({
-		.theme = _theme.get(),
-		.clip = clip,
-		.visibleAreaPositionGlobal = mapToGlobal(QPoint(0, _visibleTop)),
-		.visibleAreaTop = _visibleTop,
-		.visibleAreaWidth = width(),
-	});
+	auto context = preparePaintContext(clip);
 	if (_items.empty() && _upLoaded && _downLoaded) {
 		paintEmpty(p, context.st);
 	} else {

Telegram/SourceFiles/history/admin_log/history_admin_log_inner.h

@@ -36,6 +36,7 @@ class PopupMenu;
 class ChatStyle;
 class ChatTheme;
 struct PeerUserpicView;
+struct ChatPaintContext;
 } // namespace Ui
 
 namespace Window {
@@ -69,6 +70,8 @@ public:
 		return _channel;
 	}
 
+	Ui::ChatPaintContext preparePaintContext(QRect clip) const;
+
 	// Set the correct scroll position after being resized.
 	void restoreScrollPosition();
 

Telegram/SourceFiles/history/admin_log/history_admin_log_section.cpp

@@ -9,8 +9,10 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "history/admin_log/history_admin_log_inner.h"
 #include "history/admin_log/history_admin_log_filter.h"
+#include "history/history_view_swipe.h"
 #include "profile/profile_back_button.h"
 #include "core/shortcuts.h"
+#include "ui/chat/chat_style.h"
 #include "ui/effects/animations.h"
 #include "ui/widgets/scroll_area.h"
 #include "ui/widgets/shadow.h"
@@ -341,6 +343,7 @@ Widget::Widget(
 	});
 
 	setupShortcuts();
+	setupSwipeReply();
 }
 
 void Widget::showFilter() {
@@ -416,6 +419,37 @@ void Widget::setupShortcuts() {
 	}, lifetime());
 }
 
+void Widget::setupSwipeReply() {
+	HistoryView::SetupSwipeHandler(this, _scroll.data(), [=](
+			HistoryView::ChatPaintGestureHorizontalData data) {
+		if (data.translation > 0) {
+			if (!_swipeBackData.callback) {
+				_swipeBackData = HistoryView::SetupSwipeBack(
+					this,
+					[=]() -> std::pair<QColor, QColor> {
+						auto context = _inner->preparePaintContext({});
+						return {
+							context.st->msgServiceBg()->c,
+							context.st->msgServiceFg()->c,
+						};
+					});
+			}
+			_swipeBackData.callback(data);
+			return;
+		} else if (_swipeBackData.lifetime) {
+			_swipeBackData = {};
+		}
+	}, [=](int, Qt::LayoutDirection direction) {
+		if (direction == Qt::RightToLeft) {
+			return HistoryView::SwipeHandlerFinishData{
+				.callback = [=] { controller()->showBackFromStack(); },
+				.msgBareId = HistoryView::kMsgBareIdSwipeBack,
+			};
+		}
+		return HistoryView::SwipeHandlerFinishData();
+	}, nullptr);
+}
+
 std::shared_ptr<Window::SectionMemento> Widget::createMemento() {
 	auto result = std::make_shared<SectionMemento>(channel());
 	saveState(result.get());

Telegram/SourceFiles/history/admin_log/history_admin_log_section.h

@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "window/section_memento.h"
 #include "history/admin_log/history_admin_log_item.h"
 #include "history/admin_log/history_admin_log_filter_value.h"
+#include "history/history_view_swipe_data.h"
 #include "mtproto/sender.h"
 
 namespace Ui {
@@ -74,6 +75,7 @@ private:
 	void saveState(not_null<SectionMemento*> memento);
 	void restoreState(not_null<SectionMemento*> memento);
 	void setupShortcuts();
+	void setupSwipeReply();
 
 	object_ptr<Ui::ScrollArea> _scroll;
 	QPointer<InnerWidget> _inner;
@@ -81,6 +83,8 @@ private:
 	object_ptr<Ui::PlainShadow> _fixedBarShadow;
 	object_ptr<Ui::FlatButton> _whatIsThis;
 
+	HistoryView::SwipeBackResult _swipeBackData;
+
 };
 
 class SectionMemento : public Window::SectionMemento {