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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.
#include "ash/system/power/backlights_forced_off_setter.h"
#include "ash/constants/ash_switches.h"
#include "ash/shell.h"
#include "ash/system/power/scoped_backlights_forced_off.h"
#include "ash/touch/touch_devices_controller.h"
#include "base/check_op.h"
#include "base/command_line.h"
#include "base/functional/bind.h"
#include "chromeos/dbus/power_manager/backlight.pb.h"
#include "ui/display/manager/touch_device_manager.h"
namespace ash {
BacklightsForcedOffSetter::BacklightsForcedOffSetter() {
InitDisableTouchscreenWhileScreenOff();
power_manager_observation_.Observe(chromeos::PowerManagerClient::Get());
GetInitialBacklightsForcedOff();
}
BacklightsForcedOffSetter::~BacklightsForcedOffSetter() {
if (active_backlights_forced_off_count_ > 0) {
chromeos::PowerManagerClient::Get()->SetBacklightsForcedOff(false);
}
}
void BacklightsForcedOffSetter::AddObserver(ScreenBacklightObserver* observer) {
observers_.AddObserver(observer);
}
void BacklightsForcedOffSetter::RemoveObserver(
ScreenBacklightObserver* observer) {
observers_.RemoveObserver(observer);
}
ScreenBacklightState BacklightsForcedOffSetter::GetScreenBacklightState()
const {
return screen_backlight_state_;
}
std::unique_ptr<ScopedBacklightsForcedOff>
BacklightsForcedOffSetter::ForceBacklightsOff() {
auto scoped_backlights_forced_off =
std::make_unique<ScopedBacklightsForcedOff>(base::BindOnce(
&BacklightsForcedOffSetter::OnScopedBacklightsForcedOffDestroyed,
weak_ptr_factory_.GetWeakPtr()));
++active_backlights_forced_off_count_;
SetBacklightsForcedOff(true);
return scoped_backlights_forced_off;
}
void BacklightsForcedOffSetter::ScreenBrightnessChanged(
const power_manager::BacklightBrightnessChange& change) {
const bool user_initiated =
change.cause() ==
power_manager::BacklightBrightnessChange_Cause_USER_REQUEST;
const ScreenBacklightState old_state = screen_backlight_state_;
if (change.percent() > 0.0)
screen_backlight_state_ = ScreenBacklightState::ON;
else
screen_backlight_state_ = user_initiated ? ScreenBacklightState::OFF
: ScreenBacklightState::OFF_AUTO;
if (screen_backlight_state_ != old_state) {
for (auto& observer : observers_)
observer.OnScreenBacklightStateChanged(screen_backlight_state_);
}
// Disable the touchscreen when the screen is turned off due to inactivity:
// https://crbug.com/743291
if ((screen_backlight_state_ == ScreenBacklightState::OFF_AUTO) !=
(old_state == ScreenBacklightState::OFF_AUTO) &&
disable_touchscreen_while_screen_off_) {
UpdateTouchscreenStatus();
}
}
void BacklightsForcedOffSetter::PowerManagerRestarted() {
if (backlights_forced_off_.has_value()) {
chromeos::PowerManagerClient::Get()->SetBacklightsForcedOff(
backlights_forced_off_.value());
} else {
GetInitialBacklightsForcedOff();
}
}
void BacklightsForcedOffSetter::ResetForTest() {
if (active_backlights_forced_off_count_ > 0) {
chromeos::PowerManagerClient::Get()->SetBacklightsForcedOff(false);
}
// Cancel all backlights forced off requests.
weak_ptr_factory_.InvalidateWeakPtrs();
active_backlights_forced_off_count_ = 0;
InitDisableTouchscreenWhileScreenOff();
backlights_forced_off_.reset();
GetInitialBacklightsForcedOff();
}
void BacklightsForcedOffSetter::InitDisableTouchscreenWhileScreenOff() {
disable_touchscreen_while_screen_off_ =
!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kTouchscreenUsableWhileScreenOff);
}
void BacklightsForcedOffSetter::GetInitialBacklightsForcedOff() {
chromeos::PowerManagerClient::Get()->GetBacklightsForcedOff(base::BindOnce(
&BacklightsForcedOffSetter::OnGotInitialBacklightsForcedOff,
weak_ptr_factory_.GetWeakPtr()));
}
void BacklightsForcedOffSetter::OnGotInitialBacklightsForcedOff(
std::optional<bool> is_forced_off) {
if (backlights_forced_off_.has_value() || !is_forced_off.has_value())
return;
backlights_forced_off_ = is_forced_off;
UpdateTouchscreenStatus();
for (auto& observer : observers_)
observer.OnBacklightsForcedOffChanged(backlights_forced_off_.value());
}
void BacklightsForcedOffSetter::OnScopedBacklightsForcedOffDestroyed() {
DCHECK_GT(active_backlights_forced_off_count_, 0);
--active_backlights_forced_off_count_;
SetBacklightsForcedOff(active_backlights_forced_off_count_ > 0);
}
void BacklightsForcedOffSetter::SetBacklightsForcedOff(bool forced_off) {
if (backlights_forced_off_.has_value() &&
backlights_forced_off_.value() == forced_off) {
return;
}
backlights_forced_off_ = forced_off;
chromeos::PowerManagerClient::Get()->SetBacklightsForcedOff(forced_off);
UpdateTouchscreenStatus();
for (auto& observer : observers_)
observer.OnBacklightsForcedOffChanged(backlights_forced_off_.value());
}
void BacklightsForcedOffSetter::UpdateTouchscreenStatus() {
// If there is an external touch display connected to the device, then we want
// to allow users to wake up the device using this external touch device. The
// kernel blocks wake up events from internal input devices when the screen is
// off or is in the suspended state.
// See https://crbug/797411 for more details.
const bool disable_touchscreen =
backlights_forced_off_.value_or(false) ||
(screen_backlight_state_ == ScreenBacklightState::OFF_AUTO &&
disable_touchscreen_while_screen_off_ &&
!display::HasExternalTouchscreenDevice());
Shell::Get()->touch_devices_controller()->SetTouchscreenEnabled(
!disable_touchscreen, TouchDeviceEnabledSource::GLOBAL);
}
} // namespace ash
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