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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 */
#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 {
using ScrollingMetricsPromise =
MozPromise<Tuple<uint32_t, uint32_t>, bool, true>;
static RefPtr<ScrollingMetricsPromise> CollectScrollingMetrics() {
return GetSingleton()->CollectScrollingMetricsInternal();
// Return the tuple of <scrollingTimeInMilliseconds,
// ScrollingDistanceInPixels>
static Tuple<uint32_t, uint32_t> CollectLocalScrollingMetrics() {
return GetSingleton()->CollectLocalScrollingMetricsInternal();
// Report a new user-initiated scrolling interaction
static void OnScrollingInteraction(CSSCoord distanceScrolled);
static void OnScrollingInteractionEnded();
static ScrollingMetrics* GetSingleton();
static StaticAutoPtr<ScrollingMetrics> sSingleton;
RefPtr<ScrollingMetricsPromise> CollectScrollingMetricsInternal();
Tuple<uint32_t, uint32_t> CollectLocalScrollingMetricsInternal();
} // namespace mozilla
#endif /* mozilla_dom_ScrollingMetrics_h */