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// Copyright 2013 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_BRIGHTNESS_CONTROL_DELEGATE_H_
#define ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
#include <optional>
#include "base/functional/callback.h"
#include "base/functional/callback_forward.h"
namespace ash {
// Delegate for controlling the brightness.
class BrightnessControlDelegate {
public:
virtual ~BrightnessControlDelegate() {}
// Handles an accelerator-driven request to decrease or increase the screen
// brightness.
virtual void HandleBrightnessDown() = 0;
virtual void HandleBrightnessUp() = 0;
// Enum to represent the source of a brightness change, i.e. what triggered
// the brightness change.
enum class BrightnessChangeSource {
kUnknown = 0,
kQuickSettings = 1,
kSettingsApp = 2,
kRestoredFromUserPref = 3,
kMaxValue = kRestoredFromUserPref,
};
// Enum to represent the source of a ambient light sensor change,
// Note that changing brightness can also disable the Ambient Light
// Sensor. This change is not directly made by calling the
// SetAmbientLightSensorEnabled function in the BrightnessControlDelegate in
// Chrome, it is handled in the platform.
enum class AmbientLightSensorEnabledChangeSource {
kSettingsApp = 0,
kRestoredFromUserPref = 1,
kSystemReenabled = 2,
kMaxValue = kSystemReenabled,
};
// Requests that the brightness be set to |percent|, in the range
// [0.0, 100.0]. |gradual| specifies whether the transition to the new
// brightness should be animated or instantaneous. |source| is required to
// indicate what is causing this brightness change.
virtual void SetBrightnessPercent(double percent,
bool gradual,
BrightnessChangeSource source) = 0;
// Asynchronously invokes |callback| with the current brightness, in the range
// [0.0, 100.0]. In case of error, it is called with nullopt.
virtual void GetBrightnessPercent(
base::OnceCallback<void(std::optional<double>)> callback) = 0;
// Sets whether the ambient light sensor should be used in brightness
// calculations.
virtual void SetAmbientLightSensorEnabled(
bool enabled,
AmbientLightSensorEnabledChangeSource source) = 0;
// Asynchronously invokes |callback| with true if the ambient light sensor is
// enabled (i.e. if the ambient light sensor is currently being used in
// brightness calculations). In case of error, |callback| will be run with
// nullopt.
virtual void GetAmbientLightSensorEnabled(
base::OnceCallback<void(std::optional<bool>)> callback) = 0;
// Asynchronously invokes |callback| with true if the device has at least one
// ambient light sensor. In case of error, |callback| will be run with
// nullopt.
virtual void HasAmbientLightSensor(
base::OnceCallback<void(std::optional<bool>)> callback) = 0;
};
} // namespace ash
#endif // ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
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