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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.
#ifndef CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_CHROME_VISIBILITY_OBSERVER_H_
#define CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_CHROME_VISIBILITY_OBSERVER_H_
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/ui/browser_list_observer.h"
namespace metrics {
// Observer for tracking browser visibility events.
class ChromeVisibilityObserver : public BrowserListObserver {
public:
ChromeVisibilityObserver();
~ChromeVisibilityObserver() override;
protected:
// Notifies |DesktopSessionDurationTracker| of visibility changes. Overridden
// by tests.
virtual void SendVisibilityChangeEvent(bool active, base::TimeDelta time_ago);
private:
// Cancels visibility change in case when the browser becomes visible after a
// short gap.
void CancelVisibilityChange();
// BrowserListObserver:
void OnBrowserSetLastActive(Browser* browser) override;
void OnBrowserNoLongerActive(Browser* browser) override;
void OnBrowserRemoved(Browser* browser) override;
// Sets |visibility_gap_timeout_| based on variation params.
void InitVisibilityGapTimeout();
// Timeout interval for waiting after loss of visibility. This allows merging
// two visibility session if they happened very shortly after each other, for
// example, when user switching between two browser windows.
base::TimeDelta visibility_gap_timeout_;
base::WeakPtrFactory<ChromeVisibilityObserver> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ChromeVisibilityObserver);
};
} // namespace metrics
#endif // CHROME_BROWSER_METRICS_DESKTOP_SESSION_DURATION_CHROME_VISIBILITY_OBSERVER_H_