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-rw-r--r--dom/base/ScrollingMetrics.h51
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diff --git a/dom/base/ScrollingMetrics.h b/dom/base/ScrollingMetrics.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_ScrollingMetrics_h
+#define mozilla_dom_ScrollingMetrics_h
+
+#include "Units.h"
+#include "mozilla/MozPromise.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/StaticPtr.h"
+
+namespace mozilla {
+
+/**
+ * ScrollingMetrics records user-intiated scrolling interactions. These are
+ * aggregrated along with other user interactions (e.g. typing, view time), in
+ * the history metadata.
+ */
+class ScrollingMetrics {
+ public:
+ using ScrollingMetricsPromise =
+ MozPromise<std::tuple<uint32_t, uint32_t>, bool, true>;
+
+ static RefPtr<ScrollingMetricsPromise> CollectScrollingMetrics() {
+ return GetSingleton()->CollectScrollingMetricsInternal();
+ }
+
+ // Return the tuple of <scrollingTimeInMilliseconds,
+ // ScrollingDistanceInPixels>
+ static std::tuple<uint32_t, uint32_t> CollectLocalScrollingMetrics() {
+ return GetSingleton()->CollectLocalScrollingMetricsInternal();
+ }
+
+ // Report a new user-initiated scrolling interaction
+ static void OnScrollingInteraction(CSSCoord distanceScrolled);
+
+ static void OnScrollingInteractionEnded();
+
+ private:
+ static ScrollingMetrics* GetSingleton();
+ static StaticAutoPtr<ScrollingMetrics> sSingleton;
+ RefPtr<ScrollingMetricsPromise> CollectScrollingMetricsInternal();
+ std::tuple<uint32_t, uint32_t> CollectLocalScrollingMetricsInternal();
+};
+
+} // namespace mozilla
+
+#endif /* mozilla_dom_ScrollingMetrics_h */