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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_TIMING_EVENT_TIMING_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_TIMING_EVENT_TIMING_H_
#include <memory>
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/timing/window_performance.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class Event;
// Event timing collects and records the event start time, processing start time
// and processing end time of long-latency events, providing a tool to evalute
// input latency.
// See also: https://github.com/wicg/event-timing
class CORE_EXPORT EventTiming final {
USING_FAST_MALLOC(EventTiming);
public:
// Processes an event that will be dispatched. Notifies the
// InteractiveDetector if it needs to be logged into input delay histograms.
// Returns an object only if the event is relevant for the EventTiming API.
static std::unique_ptr<EventTiming> Create(LocalDOMWindow*, const Event&);
explicit EventTiming(base::TimeTicks processing_start,
base::TimeTicks event_timestamp,
WindowPerformance* performance,
bool should_log);
// Notifies the Performance object that the event has been dispatched.
void DidDispatchEvent(const Event&, Document& document);
// The caller owns the |clock| which must outlive the EventTiming.
static void SetTickClockForTesting(const base::TickClock* clock);
private:
// The time the first event handler or default action started to execute.
base::TimeTicks processing_start_;
// The event timestamp to be used in EventTiming and in histograms.
base::TimeTicks event_timestamp_;
Persistent<WindowPerformance> performance_;
bool should_log_event_;
DISALLOW_COPY_AND_ASSIGN(EventTiming);
};
} // namespace blink
#endif
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