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- // Copyright 2017 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_SYSTEM_POWER_BACKLIGHTS_FORCED_OFF_SETTER_H_
- #define ASH_SYSTEM_POWER_BACKLIGHTS_FORCED_OFF_SETTER_H_
- #include <memory>
- #include "ash/ash_export.h"
- #include "ash/public/cpp/screen_backlight.h"
- #include "ash/public/cpp/screen_backlight_observer.h"
- #include "ash/public/cpp/screen_backlight_type.h"
- #include "base/memory/weak_ptr.h"
- #include "base/observer_list.h"
- #include "base/scoped_observation.h"
- #include "chromeos/dbus/power/power_manager_client.h"
- #include "third_party/abseil-cpp/absl/types/optional.h"
- namespace ash {
- class ScopedBacklightsForcedOff;
- // BacklightsForcedOffSetter manages multiple requests to force the backlights
- // off and coalesces them into SetBacklightsForcedOff D-Bus calls to powerd.
- class ASH_EXPORT BacklightsForcedOffSetter
- : public chromeos::PowerManagerClient::Observer,
- public ScreenBacklight {
- public:
- BacklightsForcedOffSetter();
- BacklightsForcedOffSetter(const BacklightsForcedOffSetter&) = delete;
- BacklightsForcedOffSetter& operator=(const BacklightsForcedOffSetter&) =
- delete;
- ~BacklightsForcedOffSetter() override;
- bool backlights_forced_off() const {
- return backlights_forced_off_.value_or(false);
- }
- // ScreenBacklight:
- void AddObserver(ScreenBacklightObserver* observer) override;
- void RemoveObserver(ScreenBacklightObserver* observer) override;
- ScreenBacklightState GetScreenBacklightState() const override;
- // Forces the backlights off. The backlights will be kept in the forced-off
- // state until all requests have been destroyed.
- std::unique_ptr<ScopedBacklightsForcedOff> ForceBacklightsOff();
- // Overridden from chromeos::PowerManagerClient::Observer:
- void ScreenBrightnessChanged(
- const power_manager::BacklightBrightnessChange& change) override;
- void PowerManagerRestarted() override;
- // Resets internal state for tests.
- // Note: This will silently cancel all active backlights forced off requests.
- void ResetForTest();
- private:
- // Sets |disable_touchscreen_while_screen_off_| depending on the state of the
- // current command line,
- void InitDisableTouchscreenWhileScreenOff();
- // Sends a request to powerd to get the backlights forced off state so that
- // |backlights_forced_off_| can be initialized.
- void GetInitialBacklightsForcedOff();
- // Callback for |GetInitialBacklightsForcedOff()|.
- void OnGotInitialBacklightsForcedOff(absl::optional<bool> is_forced_off);
- // Removes a force backlights off request from the list of active ones, which
- // effectively cancels the request. This is passed to every
- // ScopedBacklightsForcedOff created by |ForceBacklightsOff| as its
- // cancellation callback.
- void OnScopedBacklightsForcedOffDestroyed();
- // Updates the power manager's backlights-forced-off state.
- void SetBacklightsForcedOff(bool forced_off);
- // Enables or disables the touchscreen by updating the global touchscreen
- // enabled status. The touchscreen is disabled when backlights are forced off
- // or |screen_backlight_state_| is OFF_AUTO.
- void UpdateTouchscreenStatus();
- // Controls whether the touchscreen is disabled when the screen is turned off
- // due to user inactivity.
- bool disable_touchscreen_while_screen_off_ = true;
- // Current forced-off state of backlights.
- absl::optional<bool> backlights_forced_off_;
- // Current screen state.
- ScreenBacklightState screen_backlight_state_ = ScreenBacklightState::ON;
- // Number of active backlights forced off requests.
- int active_backlights_forced_off_count_ = 0;
- base::ObserverList<ScreenBacklightObserver>::Unchecked observers_;
- base::ScopedObservation<chromeos::PowerManagerClient,
- chromeos::PowerManagerClient::Observer>
- power_manager_observation_{this};
- base::WeakPtrFactory<BacklightsForcedOffSetter> weak_ptr_factory_{this};
- };
- } // namespace ash
- #endif // ASH_SYSTEM_POWER_BACKLIGHTS_FORCED_OFF_SETTER_H_
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