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Telegram/SourceFiles/ui/chat/continuous_scroll.h

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+/*
+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
+
+#include "ui/widgets/scroll_area.h"
+#include "base/qt_connection.h"
+
+namespace Ui {
+
+// This class is designed for seamless scrolling of
+// on-demand augmented content.
+class ContinuousScroll final : public ScrollArea {
+public:
+	using ScrollArea::ScrollArea;
+
+	[[nodiscard]] rpl::producer<> addContentRequests() const;
+	void contentAdded();
+
+	void setTrackingContent(bool value);
+
+protected:
+	void wheelEvent(QWheelEvent *e) override;
+
+private:
+	void reconnect();
+
+	base::qt_connection _connection;
+
+	bool _contentAdded = false;
+	bool _tracking = false;
+
+	rpl::event_stream<> _addContentRequests;
+
+};
+
+} // namespace Ui