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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/views/dark_mode_manager_linux.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "components/dbus/thread_linux/dbus_thread_linux.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "ui/linux/linux_ui.h"
#include "ui/linux/linux_ui_factory.h"
#include "ui/native_theme/native_theme.h"
namespace ui {
namespace {
scoped_refptr<dbus::Bus> CreateBus() {
dbus::Bus::Options options;
options.bus_type = dbus::Bus::SESSION;
options.connection_type = dbus::Bus::PRIVATE;
options.dbus_task_runner = dbus_thread_linux::GetTaskRunner();
return base::MakeRefCounted<dbus::Bus>(options);
}
} // namespace
DarkModeManagerLinux::DarkModeManagerLinux()
: DarkModeManagerLinux(CreateBus(),
ui::GetDefaultLinuxUiTheme(),
&ui::GetLinuxUiThemes(),
std::vector<ui::NativeTheme*>{
ui::NativeTheme::GetInstanceForNativeUi(),
ui::NativeTheme::GetInstanceForWeb()}) {}
DarkModeManagerLinux::DarkModeManagerLinux(
scoped_refptr<dbus::Bus> bus,
LinuxUiTheme* default_linux_ui_theme,
const std::vector<LinuxUiTheme*>* linux_ui_themes,
std::vector<NativeTheme*> native_themes)
: linux_ui_themes_(linux_ui_themes),
native_themes_(native_themes),
bus_(bus),
settings_proxy_(bus_->GetObjectProxy(
kFreedesktopSettingsService,
dbus::ObjectPath(kFreedesktopSettingsObjectPath))) {
// Subscribe to changes in the color scheme preference.
settings_proxy_->ConnectToSignal(
kFreedesktopSettingsInterface, kSettingChangedSignal,
base::BindRepeating(&DarkModeManagerLinux::OnPortalSettingChanged,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&DarkModeManagerLinux::OnSignalConnected,
weak_ptr_factory_.GetWeakPtr()));
// Read initial color scheme preference.
dbus::MethodCall method_call(kFreedesktopSettingsInterface, kReadMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendString(kSettingsNamespace);
writer.AppendString(kColorSchemeKey);
settings_proxy_->CallMethodWithErrorCallback(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&DarkModeManagerLinux::OnReadColorSchemeResponse,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&DarkModeManagerLinux::OnReadColorSchemeError,
weak_ptr_factory_.GetWeakPtr()));
// Read the toolkit preference while asynchronously fetching the
// portal preference.
if (default_linux_ui_theme) {
auto* native_theme = default_linux_ui_theme->GetNativeTheme();
native_theme_observer_.Observe(native_theme);
SetColorScheme(native_theme->ShouldUseDarkColors(), true);
}
}
DarkModeManagerLinux::~DarkModeManagerLinux() {
settings_proxy_ = nullptr;
dbus::Bus* const bus_ptr = bus_.get();
// `task_runner` may be nullptr in testing.
if (auto* task_runner = bus_ptr->GetDBusTaskRunner()) {
task_runner->PostTask(
FROM_HERE,
base::BindOnce(&dbus::Bus::ShutdownAndBlock, std::move(bus_)));
}
}
void DarkModeManagerLinux::OnNativeThemeUpdated(
ui::NativeTheme* observed_theme) {
SetColorScheme(observed_theme->ShouldUseDarkColors(), true);
}
void DarkModeManagerLinux::OnSignalConnected(const std::string& interface_name,
const std::string& signal_name,
bool connected) {
// Nothing to do. Continue using the toolkit setting if !connected.
}
void DarkModeManagerLinux::OnPortalSettingChanged(dbus::Signal* signal) {
dbus::MessageReader reader(signal);
std::string namespace_changed;
std::string key_changed;
dbus::MessageReader variant_reader(nullptr);
if (!reader.PopString(&namespace_changed) ||
!reader.PopString(&key_changed) || !reader.PopVariant(&variant_reader)) {
LOG(ERROR) << "Received malformed Setting Changed signal from "
"org.freedesktop.portal.Settings";
return;
}
if (namespace_changed != kSettingsNamespace ||
key_changed != kColorSchemeKey) {
return;
}
uint32_t new_color_scheme;
if (!variant_reader.PopUint32(&new_color_scheme)) {
LOG(ERROR)
<< "Failed to read color-scheme value from SettingChanged signal";
return;
}
SetColorScheme(new_color_scheme == kFreedesktopColorSchemeDark, false);
}
void DarkModeManagerLinux::OnReadColorSchemeResponse(dbus::Response* response) {
if (!response) {
// Continue using the toolkit setting.
return;
}
dbus::MessageReader reader(response);
dbus::MessageReader variant_reader(nullptr);
if (!reader.PopVariant(&variant_reader)) {
LOG(ERROR) << "Failed to read variant from Read method response";
return;
}
uint32_t new_color_scheme;
if (!variant_reader.PopVariantOfUint32(&new_color_scheme)) {
LOG(ERROR) << "Failed to read color-scheme value from Read "
"method response";
return;
}
// Once we read the org.freedesktop.appearance color-scheme setting
// successfully, it should always take precedence over the toolkit color
// scheme.
ignore_toolkit_theme_changes_ = true;
SetColorScheme(new_color_scheme == kFreedesktopColorSchemeDark, false);
}
void DarkModeManagerLinux::OnReadColorSchemeError(dbus::ErrorResponse* error) {
// Ignore errors. It's expected that the settings portal may not exist.
}
void DarkModeManagerLinux::SetColorScheme(bool prefer_dark_theme,
bool from_toolkit_theme) {
if (from_toolkit_theme && ignore_toolkit_theme_changes_) {
return;
}
if (!from_toolkit_theme) {
for (auto* linux_ui_theme : *linux_ui_themes_) {
linux_ui_theme->SetDarkTheme(prefer_dark_theme);
}
}
if (prefer_dark_theme_ == prefer_dark_theme) {
return;
}
prefer_dark_theme_ = prefer_dark_theme;
for (NativeTheme* theme : native_themes_) {
theme->set_use_dark_colors(prefer_dark_theme_);
theme->set_preferred_color_scheme(
prefer_dark_theme_ ? NativeTheme::PreferredColorScheme::kDark
: NativeTheme::PreferredColorScheme::kLight);
theme->NotifyOnNativeThemeUpdated();
}
}
} // namespace ui
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