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- // Copyright 2018 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 ASH_POLICY_POLICY_RECOMMENDATION_RESTORER_H_
- #define ASH_POLICY_POLICY_RECOMMENDATION_RESTORER_H_
- #include <memory>
- #include <set>
- #include <string>
- #include "ash/public/cpp/session/session_observer.h"
- #include "base/timer/timer.h"
- #include "ui/base/user_activity/user_activity_observer.h"
- class PrefChangeRegistrar;
- class PrefService;
- namespace ash {
- // Manages observing a set of prefs on signin screen. If any of the prefs has a
- // recommended value on observing, or changed to have recommended value or
- // active user session started, its user settings is cleared so that the
- // recommendation can take effect. On signin screen prefs, user settings are
- // cleared when the user becomes idle for one minute.
- //
- // The above efforts are made to ensure that the observed prefs are *policy*
- // overridden and can be restored properly. For example, a demo device on a
- // store shelf. One customer walks up to device and enables some a11y features,
- // leaving the device in a "funny" state (high contrast, screen magnifier,
- // spoken feedback enabled). After some time, another customer won't feel the
- // device looks "broken".
- class PolicyRecommendationRestorer : public SessionObserver,
- public ui::UserActivityObserver {
- public:
- PolicyRecommendationRestorer();
- PolicyRecommendationRestorer(const PolicyRecommendationRestorer&) = delete;
- PolicyRecommendationRestorer& operator=(const PolicyRecommendationRestorer&) =
- delete;
- ~PolicyRecommendationRestorer() override;
- // Caller calls to start observing recommended value for |pref_name|. It
- // should be called when signin pref service is connected but before
- // observing/loading user settings for |pref_name|.
- void ObservePref(const std::string& pref_name);
- // SessionObserver:
- void OnActiveUserPrefServiceChanged(PrefService* pref_service) override;
- // ui::UserActivityObserver:
- void OnUserActivity(const ui::Event* event) override;
- void DisableForTesting();
- base::OneShotTimer* restore_timer_for_test() { return &restore_timer_; }
- private:
- // If a recommended value and a user setting exist for |pref_name|, clears the
- // user setting so that the recommended value can take effect. If
- // |allow_delay| is |true| and user prefs not started yet, a timer is started
- // that will clear the setting when the user becomes idle for one minute.
- // Otherwise, the setting is cleared immediately.
- void Restore(bool allow_delay, const std::string& pref_name);
- void RestoreAll();
- void StartTimer();
- void StopTimer();
- std::set<std::string> pref_names_;
- std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_;
- bool active_user_pref_connected_ = false;
- base::OneShotTimer restore_timer_;
- bool disabled_for_testing_ = false;
- };
- } // namespace ash
- #endif // ASH_POLICY_POLICY_RECOMMENDATION_RESTORER_H_
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