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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 <optional>
#include <utility>
#include "base/command_line.h"
#include "base/environment.h"
#include "base/memory/raw_ptr.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<raw_ptr<LinuxUiTheme, VectorExperimental>>& GetLinuxUiThemesImpl() {
static base::NoDestructor<
std::vector<raw_ptr<LinuxUiTheme, VectorExperimental>>>
themes;
return *themes;
}
template <typename CreateLinuxUiFunc>
LinuxUiAndTheme* GetLinuxUi(CreateLinuxUiFunc&& create_linux_ui) {
// LinuxUi creation will fail without a delegate.
if (!ui::LinuxUiDelegate::GetInstance()) {
return nullptr;
}
static base::NoDestructor<std::optional<std::unique_ptr<LinuxUiAndTheme>>>
linux_ui;
if (linux_ui->has_value()) {
return linux_ui->value().get();
}
linux_ui->emplace(create_linux_ui());
LinuxUiAndTheme* ui_and_theme = linux_ui->value().get();
if (!ui_and_theme) {
return nullptr;
}
// This function is reentrant: it may be called while Initialize() is running.
// In that case, return `linux_ui`. However, if Initialize() fails,
// `linux_ui` is reset and future calls will not try to initialize again.
if (!ui_and_theme->Initialize()) {
linux_ui->value().reset();
return nullptr;
}
GetLinuxUiThemesImpl().push_back(ui_and_theme);
return ui_and_theme;
}
LinuxUiAndTheme* GetGtkUi() {
auto create_gtk_ui = []() {
#if BUILDFLAG(USE_GTK)
return BuildGtkUi();
#else
return nullptr;
#endif
};
return GetLinuxUi(create_gtk_ui);
}
LinuxUiAndTheme* GetQtUi() {
auto create_qt_ui = []() {
#if BUILDFLAG(USE_QT)
return qt::CreateQtUi(GetGtkUi());
#else
return nullptr;
#endif
};
return GetLinuxUi(create_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
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<raw_ptr<LinuxUiTheme, VectorExperimental>>&
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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