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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/linux/linux_ui_factory.h"
#include <memory>
#include <utility>
#include "base/command_line.h"
#include "base/environment.h"
#include "base/nix/xdg_util.h"
#include "base/no_destructor.h"
#include "base/strings/string_util.h"
#include "build/chromecast_buildflags.h"
#include "ui/base/buildflags.h"
#include "ui/base/ui_base_switches.h"
#include "ui/color/system_theme.h"
#include "ui/linux/fallback_linux_ui.h"
#include "ui/linux/linux_ui.h"
#include "ui/linux/linux_ui_delegate.h"
#if BUILDFLAG(USE_GTK)
#include "ui/gtk/gtk_ui_factory.h"
#endif
#if BUILDFLAG(USE_QT)
#include "ui/qt/qt_ui.h"
#endif
#if !BUILDFLAG(IS_CASTOS)
#include "ui/shell_dialogs/shell_dialog_linux.h"
#endif
namespace ui {
namespace {
std::vector<LinuxUiTheme*>& GetLinuxUiThemesImpl() {
static base::NoDestructor<std::vector<LinuxUiTheme*>> themes;
return *themes;
}
std::unique_ptr<LinuxUiAndTheme> CreateGtkUi() {
#if BUILDFLAG(USE_GTK)
auto gtk_ui = BuildGtkUi();
if (gtk_ui->Initialize()) {
GetLinuxUiThemesImpl().push_back(gtk_ui.get());
return gtk_ui;
}
#endif
return nullptr;
}
LinuxUiAndTheme* GetGtkUi() {
// LinuxUi creation will fail without a delegate.
if (!ui::LinuxUiDelegate::GetInstance()) {
return nullptr;
}
static LinuxUiAndTheme* gtk_ui = CreateGtkUi().release();
return gtk_ui;
}
std::unique_ptr<LinuxUiAndTheme> CreateQtUi() {
if (!base::FeatureList::IsEnabled(kAllowQt)) {
return nullptr;
}
#if BUILDFLAG(USE_QT)
auto qt_ui = qt::CreateQtUi(GetGtkUi());
if (qt_ui->Initialize()) {
GetLinuxUiThemesImpl().push_back(qt_ui.get());
return qt_ui;
}
#endif
return nullptr;
}
LinuxUiAndTheme* GetQtUi() {
// LinuxUi creation will fail without a delegate.
if (!ui::LinuxUiDelegate::GetInstance()) {
return nullptr;
}
static LinuxUiAndTheme* qt_ui = CreateQtUi().release();
return qt_ui;
}
std::unique_ptr<LinuxUiAndTheme> CreateFallbackUi() {
return std::make_unique<FallbackLinuxUi>();
}
LinuxUiAndTheme* GetFallbackUi() {
static LinuxUiAndTheme* fallback_ui = CreateFallbackUi().release();
return fallback_ui;
}
LinuxUiAndTheme* GetDefaultLinuxUiAndTheme() {
auto* cmd_line = base::CommandLine::ForCurrentProcess();
std::string ui_toolkit = base::ToLowerASCII(
cmd_line->GetSwitchValueASCII(switches::kUiToolkitFlag));
if (ui_toolkit == "gtk") {
if (auto* gtk_ui = GetGtkUi()) {
return gtk_ui;
}
} else if (ui_toolkit == "qt") {
if (auto* qt_ui = GetQtUi()) {
return qt_ui;
}
} else if (ui_toolkit == "fallback") {
if (auto* fallback_ui = GetFallbackUi()) {
return fallback_ui;
}
}
std::unique_ptr<base::Environment> env = base::Environment::Create();
switch (GetDefaultSystemTheme()) {
case SystemTheme::kQt:
if (auto* qt_ui = GetQtUi()) {
return qt_ui;
}
if (auto* gtk_ui = GetGtkUi()) {
return gtk_ui;
}
return GetFallbackUi();
case SystemTheme::kGtk:
case SystemTheme::kDefault:
if (auto* gtk_ui = GetGtkUi()) {
return gtk_ui;
}
if (auto* qt_ui = GetQtUi()) {
return qt_ui;
}
return GetFallbackUi();
}
}
} // namespace
BASE_FEATURE(kAllowQt, "AllowQt", base::FEATURE_ENABLED_BY_DEFAULT);
LinuxUi* GetDefaultLinuxUi() {
auto* linux_ui = GetDefaultLinuxUiAndTheme();
#if !BUILDFLAG(IS_CASTOS)
// This may create an extra thread that may race against the LinuxUi instance
// initialization, GtkInitFromCommandLine, in GtkUi for example, so this must
// be done after the call to GetDefaultLinuxUiAndTheme above, so the race
// condition is avoided.
shell_dialog_linux::Initialize();
#endif
return linux_ui;
}
LinuxUiTheme* GetDefaultLinuxUiTheme() {
return GetDefaultLinuxUiAndTheme();
}
LinuxUiTheme* GetLinuxUiTheme(SystemTheme system_theme) {
switch (system_theme) {
case SystemTheme::kQt:
return GetQtUi();
case SystemTheme::kGtk:
return GetGtkUi();
case SystemTheme::kDefault:
return nullptr;
}
}
const std::vector<LinuxUiTheme*>& GetLinuxUiThemes() {
return GetLinuxUiThemesImpl();
}
SystemTheme GetDefaultSystemTheme() {
std::unique_ptr<base::Environment> env = base::Environment::Create();
switch (base::nix::GetDesktopEnvironment(env.get())) {
case base::nix::DESKTOP_ENVIRONMENT_CINNAMON:
case base::nix::DESKTOP_ENVIRONMENT_GNOME:
case base::nix::DESKTOP_ENVIRONMENT_PANTHEON:
case base::nix::DESKTOP_ENVIRONMENT_UNITY:
case base::nix::DESKTOP_ENVIRONMENT_XFCE:
return SystemTheme::kGtk;
case base::nix::DESKTOP_ENVIRONMENT_KDE3:
case base::nix::DESKTOP_ENVIRONMENT_KDE4:
case base::nix::DESKTOP_ENVIRONMENT_KDE5:
case base::nix::DESKTOP_ENVIRONMENT_KDE6:
case base::nix::DESKTOP_ENVIRONMENT_UKUI:
case base::nix::DESKTOP_ENVIRONMENT_DEEPIN:
case base::nix::DESKTOP_ENVIRONMENT_LXQT:
return SystemTheme::kQt;
case base::nix::DESKTOP_ENVIRONMENT_OTHER:
return SystemTheme::kDefault;
}
}
} // namespace ui
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