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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_USER_EDUCATION_COMMON_SESSION_USER_EDUCATION_IDLE_OBSERVER_H_
#define COMPONENTS_USER_EDUCATION_COMMON_SESSION_USER_EDUCATION_IDLE_OBSERVER_H_
#include <optional>
#include "base/callback_list.h"
#include "base/functional/callback_forward.h"
#include "base/time/time.h"
namespace user_education {
class UserEducationTimeProvider;
// Used to observe the system/application idle state. Override virtual methods
// for testing.
class UserEducationIdleObserver {
public:
using UpdateCallback = base::RepeatingCallback<void(base::Time)>;
UserEducationIdleObserver();
UserEducationIdleObserver(const UserEducationIdleObserver&) = delete;
void operator=(const UserEducationIdleObserver&) = delete;
virtual ~UserEducationIdleObserver();
// Called by UserEducationSessionManager to initialize required data members.
void Init(const UserEducationTimeProvider* time_provider);
// Start any observation that is required to detect idle state changes.
// Default is no-op.
virtual void StartObserving();
// Returns a new last active time for the application if there is one;
// `nullopt` otherwise.
//
// Should always return `nullopt` if the application is inactive, the system
// is locked, etc.
virtual std::optional<base::Time> MaybeGetNewLastActiveTime() const = 0;
// Adds a callback to get when the last active time is updated.
base::CallbackListSubscription AddUpdateCallback(
UpdateCallback update_callback);
protected:
// Sends notifications that the last active time has changed.
void NotifyLastActiveChanged(base::Time update);
// Gets the current time from the current time source.
base::Time GetCurrentTime() const;
private:
base::RepeatingCallbackList<typename UpdateCallback::RunType>
update_callbacks_;
raw_ptr<const UserEducationTimeProvider> time_provider_ = nullptr;
};
} // namespace user_education
#endif // COMPONENTS_USER_EDUCATION_COMMON_SESSION_USER_EDUCATION_IDLE_OBSERVER_H_
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