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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_COMMON_INPUT_EVENT_WITH_LATENCY_INFO_H_
#define CONTENT_COMMON_INPUT_EVENT_WITH_LATENCY_INFO_H_
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "content/common/content_export.h"
#include "third_party/WebKit/public/platform/WebGestureEvent.h"
#include "third_party/WebKit/public/platform/WebMouseWheelEvent.h"
#include "third_party/WebKit/public/platform/WebTouchEvent.h"
#include "ui/events/blink/blink_event_util.h"
#include "ui/events/blink/web_input_event_traits.h"
#include "ui/latency/latency_info.h"
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(blink::WebInputEvent::Type type,
int modifiers,
double timeStampSeconds,
const ui::LatencyInfo& l)
: event(type, modifiers, timeStampSeconds), latency(l) {}
EventWithLatencyInfo() {}
bool CanCoalesceWith(const EventWithLatencyInfo& other)
const WARN_UNUSED_RESULT {
if (other.event.GetType() != event.GetType())
return false;
DCHECK_EQ(sizeof(T), event.size());
DCHECK_EQ(sizeof(T), other.event.size());
return ui::CanCoalesce(other.event, event);
}
void CoalesceWith(const EventWithLatencyInfo& other) {
// |other| should be a newer event than |this|.
if (other.latency.trace_id() >= 0 && latency.trace_id() >= 0)
DCHECK_GT(other.latency.trace_id(), latency.trace_id());
// New events get coalesced into older events, and the newer timestamp
// should always be preserved.
const double time_stamp_seconds = other.event.TimeStampSeconds();
ui::Coalesce(other.event, &event);
event.SetTimeStampSeconds(time_stamp_seconds);
// When coalescing two input events, we keep the oldest LatencyInfo
// for Telemetry latency tests, since it will represent the longest
// latency.
other.latency = latency;
other.latency.set_coalesced();
}
};
typedef EventWithLatencyInfo<blink::WebGestureEvent>
GestureEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebMouseWheelEvent>
MouseWheelEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebMouseEvent>
MouseEventWithLatencyInfo;
typedef EventWithLatencyInfo<blink::WebTouchEvent>
TouchEventWithLatencyInfo;
} // namespace content
#endif // CONTENT_COMMON_INPUT_EVENT_WITH_LATENCY_INFO_H_