Added swipe interceptor to info content widget.

Telegram/SourceFiles/info/info_content_widget.cpp

@@ -520,11 +520,15 @@ void ContentWidget::replaceSwipeHandler(
 	Ui::Controls::SetupSwipeHandler(std::move(args));
 }
 
+void ContentWidget::setSwipeInterceptor(SwipeInterceptor interceptor) {
+	_swipeInterceptor = std::move(interceptor);
+}
+
 void ContentWidget::setupSwipeHandler(not_null<Ui::RpWidget*> widget) {
 	_swipeHandlerLifetime.destroy();
 
 	auto update = [=](Ui::Controls::SwipeContextData data) {
-		if (data.translation > 0) {
+		if (data.translation != 0) {
 			if (!_swipeBackData.callback) {
 				_swipeBackData = Ui::Controls::SetupSwipeBack(
 					this,
@@ -533,7 +537,8 @@ void ContentWidget::setupSwipeHandler(not_null<Ui::RpWidget*> widget) {
 							st::historyForwardChooseBg->c,
 							st::historyForwardChooseFg->c,
 						};
-					});
+					},
+					data.translation < 0);
 			}
 			_swipeBackData.callback(data);
 			return;
@@ -543,6 +548,22 @@ void ContentWidget::setupSwipeHandler(not_null<Ui::RpWidget*> widget) {
 	};
 
 	auto init = [=](Ui::Controls::SwipeHandlerInitData data) {
+		if (_swipeInterceptor) {
+			auto mapped = data;
+			mapped.cursorPosition = _innerWrap->entity()->mapFrom(
+				_innerWrap,
+				data.cursorPosition);
+			auto result = _swipeInterceptor(mapped);
+			if (result.callback) {
+				result.callback = crl::guard(
+					this,
+					[this, onstack = std::move(result.callback)] {
+						_swipeBackData = {};
+						onstack();
+					});
+				return result;
+			}
+		}
 		if (data.direction != Qt::RightToLeft) {
 			return Ui::Controls::SwipeHandlerFinishData();
 		}

Telegram/SourceFiles/info/info_content_widget.h

@@ -10,6 +10,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "info/info_flexible_scroll.h"
 #include "info/info_wrap_widget.h"
 #include "info/statistics/info_statistics_tag.h"
+#include "ui/controls/swipe_handler.h"
 #include "ui/controls/swipe_handler_data.h"
 
 namespace Api {
@@ -162,6 +163,10 @@ public:
 
 	void replaceSwipeHandler(Ui::Controls::SwipeHandlerArgs *incompleteArgs);
 
+	using SwipeInterceptor = Fn<Ui::Controls::SwipeHandlerFinishData(
+		Ui::Controls::SwipeHandlerInitData)>;
+	void setSwipeInterceptor(SwipeInterceptor interceptor);
+
 protected:
 	template <typename Widget>
 	Widget *setInnerWidget(object_ptr<Widget> inner) {
@@ -247,6 +252,7 @@ private:
 	style::margins _paintPadding;
 
 	Ui::Controls::SwipeBackResult _swipeBackData;
+	SwipeInterceptor _swipeInterceptor;
 	rpl::lifetime _swipeHandlerLifetime;
 
 };