| // 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 "base/time/time.h" |
| #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 evaluate |
| // 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. |
| // This object should be constructed before the event is dispatched and |
| // destructed after dispatch so that we can calculate the input delay and |
| // other latency values correctly. |
| static std::unique_ptr<EventTiming> Create(LocalDOMWindow*, const Event&); |
| |
| explicit EventTiming(base::TimeTicks processing_start, |
| WindowPerformance* performance, |
| const Event& event); |
| ~EventTiming(); |
| EventTiming(const EventTiming&) = delete; |
| EventTiming& operator=(const EventTiming&) = delete; |
| |
| static void HandleInputDelay(LocalDOMWindow* window, const Event& event); |
| // The caller owns the |clock| which must outlive the EventTiming. |
| static void SetTickClockForTesting(const base::TickClock* clock); |
| |
| // Returns true when the type of the event is included in the EventTiming. |
| static bool IsEventTypeForEventTiming(const Event& event); |
| |
| 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_; |
| |
| Persistent<const Event> event_; |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_TIMING_EVENT_TIMING_H_ |