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- // Copyright 2020 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_DISPLAY_PRIVACY_SCREEN_CONTROLLER_H_
- #define ASH_DISPLAY_PRIVACY_SCREEN_CONTROLLER_H_
- #include <memory>
- #include "ash/ash_export.h"
- #include "ash/public/cpp/privacy_screen_dlp_helper.h"
- #include "ash/public/cpp/session/session_observer.h"
- #include "base/observer_list.h"
- #include "ui/display/manager/display_configurator.h"
- class PrefRegistrySimple;
- class PrefService;
- class PrefChangeRegistrar;
- namespace ash {
- // Controls the privacy screen feature.
- class ASH_EXPORT PrivacyScreenController
- : public PrivacyScreenDlpHelper,
- public SessionObserver,
- display::DisplayConfigurator::Observer {
- public:
- class Observer : public base::CheckedObserver {
- public:
- // Called when the privacy screen setting is changed.
- virtual void OnPrivacyScreenSettingChanged(bool enabled, bool notify_ui) {}
- protected:
- ~Observer() override = default;
- };
- // The UI surface from which the privacy screen is toggled on/off. Keep in
- // sync with PrivacyScreenToggleUISurface in
- // tools/metrics/histograms/enums.xml.
- enum ToggleUISurface {
- kToggleUISurfaceKeyboardShortcut,
- kToggleUISurfaceFeaturePod,
- kToggleUISurfaceToastButton,
- // Must be last.
- kToggleUISurfaceCount,
- };
- PrivacyScreenController();
- ~PrivacyScreenController() override;
- PrivacyScreenController(const PrivacyScreenController&) = delete;
- PrivacyScreenController& operator=(const PrivacyScreenController&) = delete;
- static void RegisterProfilePrefs(PrefRegistrySimple* registry);
- // Whether or not the privacy screen feature is enforced by policy.
- bool IsManaged() const;
- // Get the PrivacyScreen settings stored in the current active user prefs.
- bool GetEnabled() const;
- // Set the desired PrivacyScreen settings in the current active user prefs.
- void SetEnabled(bool enabled, ToggleUISurface ui_surface);
- void AddObserver(Observer* observer);
- void RemoveObserver(Observer* observer);
- // PrivacyScreenDlpHelper:
- bool IsSupported() const override;
- void SetEnforced(bool enforced) override;
- // SessionObserver:
- void OnActiveUserPrefServiceChanged(PrefService* pref_service) override;
- void OnSigninScreenPrefServiceInitialized(PrefService* pref_service) override;
- // DisplayConfigurator::Observer:
- void OnDisplayModeChanged(
- const std::vector<display::DisplaySnapshot*>& displays) override;
- private:
- // Calculates PrivacyScreen's logical status.
- bool CalculateCurrentStatus() const;
- // Called when the user pref or DLP enforcement for the state of PrivacyScreen
- // is changed.
- void OnStateChanged(bool notify_observers);
- // Called when GPU/DRM is done setting the privacy screen panel to
- // |requested_config|.
- void OnSetPrivacyScreenComplete(bool from_user_pref_init,
- bool requested_config,
- bool success);
- // Called when a change to |active_user_pref_service_| is detected (i.e. when
- // OnActiveUserPrefServiceChanged() is called.
- void InitFromUserPrefs();
- // Retrieves the current user's PrivacyScreen preference.
- bool GetStateFromActiveUserPreference() const;
- // Whether or not to alert observers about PrivacyScreen state change.
- bool ShouldNotifyObservers(bool from_user_pref_init) const;
- // The pref service of the currently active user. Can be null in
- // ash_unittests.
- PrefService* active_user_pref_service_ = nullptr;
- // Set to true when entering the login screen. This should happen once per
- // Chrome restart.
- bool applying_login_screen_prefs_ = false;
- // Indicates if the PrivacyScreen is currently on or off.
- bool current_status_ = false;
- // Indicates whether PrivacyScreen is enforced by Data Leak Protection
- // feature.
- bool dlp_enforced_ = false;
- base::ObserverList<Observer> observers_;
- // The registrar used to watch privacy screen prefs changes in the above
- // |active_user_pref_service_| from outside ash.
- // NOTE: Prefs are how Chrome communicates changes to the
- // PrivacyScreenController settings controlled by this class from the WebUI
- // settings.
- std::unique_ptr<PrefChangeRegistrar> pref_change_registrar_;
- // This must be the last variable.
- base::WeakPtrFactory<PrivacyScreenController> weak_ptr_factory_{this};
- };
- } // namespace ash
- #endif // ASH_DISPLAY_PRIVACY_SCREEN_CONTROLLER_H_
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