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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 "chrome/browser/metrics/desktop_session_duration/chrome_visibility_observer.h"
#include "base/functional/bind.h"
#include "base/memory/singleton.h"
#include "base/metrics/field_trial_params.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/single_thread_task_runner.h"
#include "chrome/browser/metrics/desktop_session_duration/desktop_session_duration_tracker.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
namespace metrics {
ChromeVisibilityObserver::ChromeVisibilityObserver() {
BrowserList::AddObserver(this);
InitVisibilityGapTimeout();
}
ChromeVisibilityObserver::~ChromeVisibilityObserver() {
BrowserList::RemoveObserver(this);
}
void ChromeVisibilityObserver::SendVisibilityChangeEvent(
bool active,
base::TimeDelta time_ago) {
DesktopSessionDurationTracker::Get()->OnVisibilityChanged(active, time_ago);
}
void ChromeVisibilityObserver::CancelVisibilityChange() {
weak_factory_.InvalidateWeakPtrs();
}
void ChromeVisibilityObserver::OnBrowserSetLastActive(Browser* browser) {
if (weak_factory_.HasWeakPtrs())
CancelVisibilityChange();
else
SendVisibilityChangeEvent(true, base::TimeDelta());
}
void ChromeVisibilityObserver::OnBrowserNoLongerActive(Browser* browser) {
// Check if there is an active browser instead of assuming ordering of the
// observation calls when we are switching between browsers.
const auto* last_active_browser = BrowserList::GetInstance()->GetLastActive();
bool is_active = last_active_browser && last_active_browser->IsActive();
if (!is_active) {
if (visibility_gap_timeout_.InMicroseconds() == 0) {
SendVisibilityChangeEvent(false, base::TimeDelta());
} else {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&ChromeVisibilityObserver::SendVisibilityChangeEvent,
weak_factory_.GetWeakPtr(), false,
visibility_gap_timeout_),
visibility_gap_timeout_);
}
}
}
void ChromeVisibilityObserver::OnBrowserRemoved(Browser* browser) {
// If there are no browser instances left then we should notify that browser
// is not visible anymore immediately without waiting.
if (BrowserList::GetInstance()->empty()) {
CancelVisibilityChange();
SendVisibilityChangeEvent(false, base::TimeDelta());
}
}
void ChromeVisibilityObserver::InitVisibilityGapTimeout() {
const int kDefaultVisibilityGapTimeout = 3;
int timeout_seconds = kDefaultVisibilityGapTimeout;
std::string param_value = base::GetFieldTrialParamValue(
"DesktopSessionDuration", "visibility_gap_timeout");
if (!param_value.empty())
base::StringToInt(param_value, &timeout_seconds);
visibility_gap_timeout_ = base::Seconds(timeout_seconds);
}
void ChromeVisibilityObserver::SetVisibilityGapTimeoutForTesting(
base::TimeDelta timeout) {
visibility_gap_timeout_ = timeout;
}
} // namespace metrics
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