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// Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_EVENT_WITH_LATENCY_INFO_H_
#define CONTENT_BROWSER_RENDERER_HOST_EVENT_WITH_LATENCY_INFO_H_
#include "ui/events/latency_info.h"
#include "content/common/input/web_input_event_traits.h"
#include "content/public/browser/native_web_keyboard_event.h"
namespace blink {
class WebGestureEvent;
class WebMouseEvent;
class WebMouseWheelEvent;
class WebTouchEvent;
}
namespace content {
template <typename T>
class EventWithLatencyInfo {
public:
T event;
mutable ui::LatencyInfo latency;
explicit EventWithLatencyInfo(const T& e) : event(e) {}
EventWithLatencyInfo(const T& e, const ui::LatencyInfo& l)
: event(e), latency(l) {}
EventWithLatencyInfo() {}
bool CanCoalesceWith(const EventWithLatencyInfo& other)
const WARN_UNUSED_RESULT {
return WebInputEventTraits::CanCoalesce(other.event, event);
}
void CoalesceWith(const EventWithLatencyInfo& other) {
WebInputEventTraits::Coalesce(other.event, &event);
// When coalescing two input events, we keep the oldest LatencyInfo
// for Telemetry latency test since it will represent the longest
// latency.
if (other.latency.trace_id() >= 0 &&
(latency.trace_id() < 0 ||
other.latency.trace_id() < latency.trace_id()))
latency = other.latency;
}
};
typedef EventWithLatencyInfo<NativeWebKeyboardEvent>
NativeWebKeyboardEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebGestureEvent>
GestureEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebMouseWheelEvent>
MouseWheelEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebMouseEvent>
MouseEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebTouchEvent>
TouchEventWithLatencyInfo;
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_EVENT_WITH_LATENCY_INFO_H_