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// Copyright 2016 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.
#include "third_party/blink/renderer/platform/widget/input/event_with_callback.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
#include "third_party/blink/public/common/input/web_input_event_attribution.h"
namespace blink {
EventWithCallback::EventWithCallback(
std::unique_ptr<WebCoalescedInputEvent> event,
base::TimeTicks timestamp_now,
InputHandlerProxy::EventDispositionCallback callback)
: event_(std::make_unique<WebCoalescedInputEvent>(*event)),
creation_timestamp_(timestamp_now),
last_coalesced_timestamp_(timestamp_now) {
original_events_.emplace_back(std::move(event), std::move(callback));
}
EventWithCallback::EventWithCallback(
std::unique_ptr<WebCoalescedInputEvent> event,
base::TimeTicks creation_timestamp,
base::TimeTicks last_coalesced_timestamp,
std::unique_ptr<OriginalEventList> original_events)
: event_(std::move(event)),
creation_timestamp_(creation_timestamp),
last_coalesced_timestamp_(last_coalesced_timestamp) {
if (original_events)
original_events_.splice(original_events_.end(), *original_events);
}
EventWithCallback::~EventWithCallback() {}
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,
base::TimeTicks timestamp_now) {
event_->CoalesceWith(*other->event_);
// Move original events.
original_events_.splice(original_events_.end(), other->original_events_);
last_coalesced_timestamp_ = timestamp_now;
}
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_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.
original_events_.front().event_->latency_info() = latency;
std::move(original_events_.front().callback_)
.Run(disposition, std::move(original_events_.front().event_),
did_overscroll_params
? std::make_unique<InputHandlerProxy::DidOverscrollParams>(
*did_overscroll_params)
: nullptr,
attribution);
original_events_.pop_front();
// If the event was handled on compositor thread, ack other events with
// coalesced latency to avoid redundant tracking. If not, the event should
// be handle on main thread, use the original latency instead.
//
// 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);
}
}
EventWithCallback::OriginalEventWithCallback::OriginalEventWithCallback(
std::unique_ptr<WebCoalescedInputEvent> event,
InputHandlerProxy::EventDispositionCallback callback)
: event_(std::move(event)), callback_(std::move(callback)) {}
EventWithCallback::OriginalEventWithCallback::~OriginalEventWithCallback() {}
} // namespace blink
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