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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/page_load_metrics/browser/observers/click_input_tracker.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "components/page_load_metrics/browser/features.h"
#include "services/metrics/public/cpp/ukm_builders.h"
#include "third_party/blink/public/common/input/web_gesture_event.h"
#include "third_party/blink/public/common/input/web_mouse_event.h"
namespace page_load_metrics {
namespace {
bool IsClickInputTrackerEnabled() {
static bool enabled = base::FeatureList::IsEnabled(
page_load_metrics::features::kClickInputTracker);
return enabled;
}
} // namespace
const int kMaxCountForUkm = 50;
ClickInputTracker::ClickInputTracker() {
// Set thresholds per Feature parameters as appropriate.
time_delta_threshold_ =
base::Milliseconds(base::GetFieldTrialParamByFeatureAsInt(
page_load_metrics::features::kClickInputTracker,
"time_delta_threshold_ms", 500));
position_delta_threshold_ = base::GetFieldTrialParamByFeatureAsInt(
page_load_metrics::features::kClickInputTracker,
"position_delta_threshold", 10);
burst_count_threshold_ = base::GetFieldTrialParamByFeatureAsInt(
page_load_metrics::features::kClickInputTracker, "burst_count_threshold",
3);
}
ClickInputTracker::~ClickInputTracker() = default;
void ClickInputTracker::OnUserInput(const blink::WebInputEvent& event) {
if (!IsClickInputTrackerEnabled()) {
return;
}
if (event.GetType() != blink::WebInputEvent::Type::kGestureTap &&
event.GetType() != blink::WebInputEvent::Type::kMouseUp) {
return;
}
gfx::PointF position;
if (event.GetType() == blink::WebInputEvent::Type::kGestureTap) {
const blink::WebGestureEvent& gesture =
static_cast<const blink::WebGestureEvent&>(event);
position = gesture.PositionInScreen();
} else if (event.GetType() == blink::WebInputEvent::Type::kMouseUp) {
const blink::WebMouseEvent& mouse_click =
static_cast<const blink::WebMouseEvent&>(event);
position = mouse_click.PositionInScreen();
} else {
NOTREACHED();
}
if (!last_click_timestamp_.is_null()) {
base::TimeDelta delta = event.TimeStamp() - last_click_timestamp_;
if (delta < time_delta_threshold_ &&
std::abs(position.x() - last_click_position_.x()) <
position_delta_threshold_ &&
std::abs(position.y() - last_click_position_.y()) <
position_delta_threshold_) {
current_click_input_burst_++;
max_click_input_burst_ =
std::max(max_click_input_burst_, current_click_input_burst_);
} else {
current_click_input_burst_ = 1;
}
} else {
current_click_input_burst_ = 1;
}
last_click_timestamp_ = event.TimeStamp();
last_click_position_ = position;
}
void ClickInputTracker::RecordClickBurst(ukm::SourceId source_id) {
if (!IsClickInputTrackerEnabled()) {
return;
}
if (max_click_input_burst_ >= burst_count_threshold_) {
UMA_HISTOGRAM_COUNTS_100("PageLoad.Experimental.ClickInputBurst",
max_click_input_burst_);
ukm::builders::ClickInput(source_id)
.SetExperimental_ClickInputBurst(
std::min(max_click_input_burst_, kMaxCountForUkm))
.Record(ukm::UkmRecorder::Get());
}
}
} // namespace page_load_metrics
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