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// Copyright 2017 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_SYSTEM_POWER_BACKLIGHTS_FORCED_OFF_SETTER_H_
#define ASH_SYSTEM_POWER_BACKLIGHTS_FORCED_OFF_SETTER_H_
#include <memory>
#include <optional>
#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"
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(std::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.
std::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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