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Telegram/lib_ui/ui/dragging_scroll_manager.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+namespace base {
+class Timer;
+} // namespace base
+
+namespace Ui {
+
+class DraggingScrollManager final {
+public:
+	DraggingScrollManager();
+
+	void checkDeltaScroll(int delta);
+	void checkDeltaScroll(const QPoint &point, int top, int bottom);
+	void cancel();
+
+	[[nodiscard]] rpl::producer<int> scrolls() const;
+
+private:
+	void scrollByTimer();
+
+	std::unique_ptr<base::Timer> _timer;
+	int _delta = 0;
+	rpl::event_stream<int> _scrolls;
+
+};
+
+} // namespace Ui