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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_SCREENLOCK_MONITOR_SCREENLOCK_MONITOR_H_
#define CONTENT_BROWSER_SCREENLOCK_MONITOR_SCREENLOCK_MONITOR_H_
#include <memory>
#include "base/memory/ref_counted.h"
#include "base/observer_list_threadsafe.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/public/browser/screenlock_observer.h"
namespace content {
class ScreenlockMonitorSource;
// A class used to monitor the screenlock state change and notify the observers
// about the change event.
// Currently available on Win/MacOSX/ChromOS only.
// TODO(crbug.com/40594737): Keep studying for a solid way to do this on Linux.
class CONTENT_EXPORT ScreenlockMonitor {
public:
ScreenlockMonitor(std::unique_ptr<ScreenlockMonitorSource> source);
ScreenlockMonitor(const ScreenlockMonitor&) = delete;
ScreenlockMonitor& operator=(const ScreenlockMonitor&) = delete;
~ScreenlockMonitor();
// Get the process-wide ScreenlockMonitor (if not present, returns NULL).
static ScreenlockMonitor* Get();
// Add and remove an observer.
// Can be called from any thread. |observer| is notified on the sequence
// from which it was registered.
// Must not be called from within a notification callback.
void AddObserver(ScreenlockObserver* observer);
void RemoveObserver(ScreenlockObserver* observer);
private:
friend class ScreenlockMonitorSource;
void NotifyScreenLocked();
void NotifyScreenUnlocked();
void ReportLockUnlockDuration(bool is_locked);
base::TimeTicks last_lock_unlock_time_;
bool is_locked_ = false;
scoped_refptr<base::ObserverListThreadSafe<ScreenlockObserver>> observers_;
std::unique_ptr<ScreenlockMonitorSource> source_;
};
} // namespace content
#endif // CONTENT_BROWSER_SCREENLOCK_MONITOR_SCREENLOCK_MONITOR_H_
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