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// Copyright (c) 2012 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 "chrome/browser/chromeos/accessibility/accessibility_util.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "chrome/browser/accessibility/accessibility_extension_api.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/extensions/extension_tts_api_platform.h"
#include "chrome/browser/extensions/component_loader.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/file_reader.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/extensions/extension_messages.h"
#include "chrome/common/extensions/extension_resource.h"
#include "chrome/common/pref_names.h"
#include "content/browser/renderer_host/render_view_host.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_ui.h"
#include "grit/browser_resources.h"
#include "grit/generated_resources.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
namespace chromeos {
namespace accessibility {
// Helper class that directly loads an extension's content scripts into
// all of the frames corresponding to a given RenderViewHost.
class ContentScriptLoader {
public:
// Initialize the ContentScriptLoader with the ID of the extension
// and the RenderViewHost where the scripts should be loaded.
ContentScriptLoader(const std::string& extension_id,
RenderViewHost* render_view_host)
: extension_id_(extension_id),
render_view_host_(render_view_host) {}
// Call this once with the ExtensionResource corresponding to each
// content script to be loaded.
void AppendScript(ExtensionResource resource) {
resources_.push(resource);
}
// Fianlly, call this method once to fetch all of the resources and
// load them. This method will delete this object when done.
void Run() {
if (resources_.empty()) {
delete this;
return;
}
ExtensionResource resource = resources_.front();
resources_.pop();
scoped_refptr<FileReader> reader(new FileReader(resource, base::Bind(
&ContentScriptLoader::OnFileLoaded, base::Unretained(this))));
reader->Start();
}
private:
void OnFileLoaded(bool success, const std::string& data) {
if (success) {
ExtensionMsg_ExecuteCode_Params params;
params.request_id = 0;
params.extension_id = extension_id_;
params.is_javascript = true;
params.code = data;
params.all_frames = true;
params.in_main_world = false;
render_view_host_->Send(new ExtensionMsg_ExecuteCode(
render_view_host_->GetRoutingID(), params));
}
Run();
}
std::string extension_id_;
RenderViewHost* render_view_host_;
std::queue<ExtensionResource> resources_;
};
void EnableSpokenFeedback(bool enabled, content::WebUI* login_web_ui) {
bool spoken_feedback_enabled = g_browser_process &&
g_browser_process->local_state()->GetBoolean(
prefs::kSpokenFeedbackEnabled);
if (spoken_feedback_enabled == enabled) {
DLOG(INFO) << "Spoken feedback is already " <<
(enabled ? "enabled" : "disabled") << ". Going to do nothing.";
return;
}
g_browser_process->local_state()->SetBoolean(
prefs::kSpokenFeedbackEnabled, enabled);
g_browser_process->local_state()->CommitPendingWrite();
ExtensionAccessibilityEventRouter::GetInstance()->
SetAccessibilityEnabled(enabled);
BrowserAccessibilityState::GetInstance()->OnAccessibilityEnabledManually();
Speak(l10n_util::GetStringUTF8(
enabled ? IDS_CHROMEOS_ACC_SPOKEN_FEEDBACK_ENABLED :
IDS_CHROMEOS_ACC_SPOKEN_FEEDBACK_DISABLED).c_str());
// Load/Unload ChromeVox
Profile* profile = ProfileManager::GetDefaultProfile();
ExtensionService* extension_service =
profile->GetExtensionService();
FilePath path = FilePath(extension_misc::kAccessExtensionPath)
.AppendASCII(extension_misc::kChromeVoxDirectoryName);
if (enabled) { // Load ChromeVox
const Extension* extension =
extension_service->component_loader()->Add(IDR_CHROMEVOX_MANIFEST,
path);
if (login_web_ui) {
RenderViewHost* render_view_host =
login_web_ui->GetWebContents()->GetRenderViewHost();
// Set a flag to tell ChromeVox that it's just been enabled,
// so that it won't interrupt our speech feedback enabled message.
ExtensionMsg_ExecuteCode_Params params;
params.request_id = 0;
params.extension_id = extension->id();
params.is_javascript = true;
params.code = "window.INJECTED_AFTER_LOAD = true;";
params.all_frames = true;
params.in_main_world = false;
render_view_host->Send(new ExtensionMsg_ExecuteCode(
render_view_host->GetRoutingID(), params));
// Inject ChromeVox' content scripts.
ContentScriptLoader* loader = new ContentScriptLoader(
extension->id(), render_view_host);
for (size_t i = 0; i < extension->content_scripts().size(); i++) {
const UserScript& script = extension->content_scripts()[i];
for (size_t j = 0; j < script.js_scripts().size(); ++j) {
const UserScript::File &file = script.js_scripts()[j];
ExtensionResource resource = extension->GetResource(
file.relative_path());
loader->AppendScript(resource);
}
}
loader->Run(); // It cleans itself up when done.
}
DLOG(INFO) << "ChromeVox was Loaded.";
} else { // Unload ChromeVox
extension_service->component_loader()->Remove(path);
DLOG(INFO) << "ChromeVox was Unloaded.";
}
}
void EnableHighContrast(bool enabled) {
PrefService* pref_service = g_browser_process->local_state();
pref_service->SetBoolean(prefs::kHighContrastEnabled, enabled);
pref_service->CommitPendingWrite();
}
void EnableScreenMagnifier(bool enabled) {
PrefService* pref_service = g_browser_process->local_state();
pref_service->SetBoolean(prefs::kScreenMagnifierEnabled, enabled);
pref_service->CommitPendingWrite();
}
void EnableVirtualKeyboard(bool enabled) {
PrefService* pref_service = g_browser_process->local_state();
pref_service->SetBoolean(prefs::kVirtualKeyboardEnabled, enabled);
pref_service->CommitPendingWrite();
}
void ToggleSpokenFeedback(content::WebUI* login_web_ui) {
bool spoken_feedback_enabled = g_browser_process &&
g_browser_process->local_state()->GetBoolean(
prefs::kSpokenFeedbackEnabled);
spoken_feedback_enabled = !spoken_feedback_enabled;
EnableSpokenFeedback(spoken_feedback_enabled, login_web_ui);
};
void Speak(const std::string& utterance) {
UtteranceContinuousParameters params;
ExtensionTtsPlatformImpl::GetInstance()->Speak(
-1, // No utterance ID because we don't need a callback when it finishes.
utterance.c_str(),
g_browser_process->GetApplicationLocale(),
params);
}
bool IsSpokenFeedbackEnabled() {
if (!g_browser_process) {
return false;
}
PrefService* prefs = g_browser_process->local_state();
bool spoken_feedback_enabled = prefs &&
prefs->GetBoolean(prefs::kSpokenFeedbackEnabled);
return spoken_feedback_enabled;
}
void MaybeSpeak(const std::string& utterance) {
if (IsSpokenFeedbackEnabled())
Speak(utterance);
}
} // namespace accessibility
} // namespace chromeos
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