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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <glib-2.0/gmodule.h>
#include "base/bind.h"
#include "base/environment.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/task/post_task.h"
#include "ui/accessibility/platform/atk_util_auralinux.h"
typedef void (*GnomeAccessibilityModuleInitFunc)();
const char kAtkBridgeModule[] = "atk-bridge";
const char kAtkBridgePath[] = "gtk-2.0/modules/libatk-bridge.so";
const char kAtkBridgeSymbolName[] = "gnome_accessibility_module_init";
const char kGtkModules[] = "GTK_MODULES";
namespace ui {
// Returns a function pointer to be invoked on the main thread to init
// the gnome accessibility module if it's enabled (nullptr otherwise).
GnomeAccessibilityModuleInitFunc GetAccessibilityModuleInitFunc() {
base::AssertBlockingAllowed();
// Try to load libatk-bridge.so.
base::FilePath atk_bridge_path(ATK_LIB_DIR);
atk_bridge_path = atk_bridge_path.Append(kAtkBridgePath);
GModule* bridge = g_module_open(atk_bridge_path.value().c_str(),
static_cast<GModuleFlags>(0));
if (!bridge) {
VLOG(1) << "Unable to open module " << atk_bridge_path.value();
return nullptr;
}
GnomeAccessibilityModuleInitFunc init_func = nullptr;
if (!g_module_symbol(bridge, kAtkBridgeSymbolName, (gpointer*)&init_func)) {
VLOG(1) << "Unable to get symbol pointer from " << atk_bridge_path.value();
return nullptr;
}
DCHECK(init_func);
return init_func;
}
void FinishAccessibilityInitOnMainThread(
GnomeAccessibilityModuleInitFunc init_func) {
if (!init_func) {
VLOG(1) << "Will not enable ATK accessibility support.";
return;
}
init_func();
}
bool AtkUtilAuraLinux::PlatformShouldEnableAccessibility() {
std::unique_ptr<base::Environment> env(base::Environment::Create());
std::string gtk_modules;
if (!env->GetVar(kGtkModules, >k_modules))
return false;
for (const std::string& module :
base::SplitString(gtk_modules, ":", base::TRIM_WHITESPACE,
base::SPLIT_WANT_NONEMPTY)) {
if (module == kAtkBridgeModule)
return true;
}
return false;
}
void AtkUtilAuraLinux::PlatformInitializeAsync() {
base::PostTaskWithTraitsAndReplyWithResult(
FROM_HERE,
{base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
base::Bind(&GetAccessibilityModuleInitFunc),
base::Bind(&FinishAccessibilityInitOnMainThread));
}
} // namespace ui
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