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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/widget/input/event_with_callback.h"
#include "base/trace_event/trace_event.h"
#include "cc/metrics/event_metrics.h"
#include "third_party/blink/public/common/input/web_input_event_attribution.h"
namespace blink {
EventWithCallback::EventWithCallback(
std::unique_ptr<WebCoalescedInputEvent> event,
InputHandlerProxy::EventDispositionCallback callback,
std::unique_ptr<cc::EventMetrics> metrics)
: event_(std::make_unique<WebCoalescedInputEvent>(*event)) {
original_events_.emplace_back(std::move(event), std::move(metrics),
std::move(callback));
}
EventWithCallback::EventWithCallback(
std::unique_ptr<WebCoalescedInputEvent> event,
OriginalEventList original_events)
: event_(std::move(event)), original_events_(std::move(original_events)) {}
EventWithCallback::~EventWithCallback() = default;
bool EventWithCallback::CanCoalesceWith(const EventWithCallback& other) const {
return event().CanCoalesce(other.event());
}
void EventWithCallback::SetScrollbarManipulationHandledOnCompositorThread() {
for (auto& original_event : original_events_) {
original_event.event_->EventPointer()
->SetScrollbarManipulationHandledOnCompositorThread();
}
}
void EventWithCallback::CoalesceWith(EventWithCallback* other) {
event_->CoalesceWith(*other->event_);
auto* metrics = original_events_.empty()
? nullptr
: original_events_.front().metrics_.get();
auto* scroll_update_metrics = metrics ? metrics->AsScrollUpdate() : nullptr;
auto* other_metrics = other->original_events_.empty()
? nullptr
: other->original_events_.front().metrics_.get();
auto* other_scroll_update_metrics =
other_metrics ? other_metrics->AsScrollUpdate() : nullptr;
if (scroll_update_metrics && other_scroll_update_metrics)
scroll_update_metrics->CoalesceWith(*other_scroll_update_metrics);
// Move original events.
original_events_.splice(original_events_.end(), other->original_events_);
}
static bool HandledOnCompositorThread(
InputHandlerProxy::EventDisposition disposition) {
return (disposition != InputHandlerProxy::DID_NOT_HANDLE &&
disposition !=
InputHandlerProxy::DID_NOT_HANDLE_NON_BLOCKING_DUE_TO_FLING &&
disposition != InputHandlerProxy::DID_NOT_HANDLE_NON_BLOCKING);
}
void EventWithCallback::RunCallbacks(
InputHandlerProxy::EventDisposition disposition,
const ui::LatencyInfo& latency,
std::unique_ptr<InputHandlerProxy::DidOverscrollParams>
did_overscroll_params,
const WebInputEventAttribution& attribution) {
// |original_events_| could be empty if this is the scroll event extracted
// from the matrix multiplication.
if (original_events_.size() == 0)
return;
// Ack the oldest event with original latency.
auto& oldest_event = original_events_.front();
oldest_event.event_->latency_info() = latency;
std::move(oldest_event.callback_)
.Run(disposition, std::move(oldest_event.event_),
did_overscroll_params
? std::make_unique<InputHandlerProxy::DidOverscrollParams>(
*did_overscroll_params)
: nullptr,
attribution, std::move(oldest_event.metrics_));
original_events_.pop_front();
// If the event was handled on the compositor thread, ack other events with
// coalesced latency to avoid redundant tracking. `cc::EventMetrics` objects
// will also be nullptr in this case because `TakeMetrics()` function is
// already called and deleted them. This is fine since no further processing
// and metrics reporting will be done on the events.
//
// On the other hand, if the event was not handled, original events should be
// handled on the main thread. So, original latencies and `cc::EventMetrics`
// should be used.
//
// We overwrite the trace_id to ensure proper flow events along the critical
// path.
bool handled = HandledOnCompositorThread(disposition);
for (auto& coalesced_event : original_events_) {
if (handled) {
int64_t original_trace_id =
coalesced_event.event_->latency_info().trace_id();
coalesced_event.event_->latency_info() = latency;
coalesced_event.event_->latency_info().set_trace_id(original_trace_id);
coalesced_event.event_->latency_info().set_coalesced();
}
std::move(coalesced_event.callback_)
.Run(disposition, std::move(coalesced_event.event_),
did_overscroll_params
? std::make_unique<InputHandlerProxy::DidOverscrollParams>(
*did_overscroll_params)
: nullptr,
attribution, std::move(coalesced_event.metrics_));
}
}
std::unique_ptr<cc::EventMetrics> EventWithCallback::TakeMetrics() {
auto it = original_events_.begin();
// Scroll events extracted from the matrix multiplication have no original
// events and we don't report metrics for them.
if (it == original_events_.end())
return nullptr;
// Throw away all original metrics except for the first one as they are not
// useful anymore.
auto first = it++;
for (; it != original_events_.end(); it++)
it->metrics_ = nullptr;
// Return metrics for the first original event for reporting purposes.
return std::move(first->metrics_);
}
void EventWithCallback::WillStartProcessingForMetrics() {
DCHECK(metrics());
for (auto& original_event : original_events_) {
if (original_event.metrics_) {
original_event.metrics_->SetDispatchStageTimestamp(
cc::EventMetrics::DispatchStage::kRendererCompositorStarted);
}
}
}
void EventWithCallback::DidCompleteProcessingForMetrics() {
DCHECK(metrics());
for (auto& original_event : original_events_) {
if (original_event.metrics_) {
original_event.metrics_->SetDispatchStageTimestamp(
cc::EventMetrics::DispatchStage::kRendererCompositorFinished);
}
}
}
EventWithCallback::OriginalEventWithCallback::OriginalEventWithCallback(
std::unique_ptr<WebCoalescedInputEvent> event,
std::unique_ptr<cc::EventMetrics> metrics,
InputHandlerProxy::EventDispositionCallback callback)
: event_(std::move(event)),
metrics_(std::move(metrics)),
callback_(std::move(callback)) {}
EventWithCallback::OriginalEventWithCallback::~OriginalEventWithCallback() =
default;
} // namespace blink
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