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// Copyright 2020 The Chromium Authors
// 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/memory/raw_ptr.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;
};
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);
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 OnDisplayConfigurationChanged(
const std::vector<raw_ptr<display::DisplaySnapshot, VectorExperimental>>&
displays) override;
private:
friend class PrivacyScreenToastControllerTest;
// 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.
raw_ptr<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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