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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/accessibility/accessibility_extension_api.h"
#include "base/json/json_writer.h"
#include "base/strings/string_number_conversions.h"
#include "base/values.h"
#include "chrome/browser/accessibility/accessibility_extension_api_constants.h"
#include "chrome/browser/extensions/api/tabs/tabs_constants.h"
#include "chrome/browser/extensions/event_router.h"
#include "chrome/browser/extensions/extension_system.h"
#include "chrome/browser/extensions/extension_tab_util.h"
#include "chrome/browser/infobars/confirm_infobar_delegate.h"
#include "chrome/browser/infobars/infobar_delegate.h"
#include "chrome/browser/infobars/infobar_service.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/browser_accessibility_state.h"
#include "extensions/common/error_utils.h"
namespace keys = extension_accessibility_api_constants;
// Returns the AccessibilityControlInfo serialized into a JSON string,
// consisting of an array of a single object of type AccessibilityObject,
// as defined in the accessibility extension api's json schema.
scoped_ptr<ListValue> ControlInfoToEventArguments(
const AccessibilityEventInfo* info) {
DictionaryValue* dict = new DictionaryValue();
info->SerializeToDict(dict);
scoped_ptr<ListValue> args(new ListValue());
args->Append(dict);
return args.Pass();
}
ExtensionAccessibilityEventRouter*
ExtensionAccessibilityEventRouter::GetInstance() {
return Singleton<ExtensionAccessibilityEventRouter>::get();
}
ExtensionAccessibilityEventRouter::ExtensionAccessibilityEventRouter()
: enabled_(false) {
}
ExtensionAccessibilityEventRouter::~ExtensionAccessibilityEventRouter() {
control_event_callback_.Reset();
}
void ExtensionAccessibilityEventRouter::SetAccessibilityEnabled(bool enabled) {
enabled_ = enabled;
}
bool ExtensionAccessibilityEventRouter::IsAccessibilityEnabled() const {
return enabled_;
}
void ExtensionAccessibilityEventRouter::SetControlEventCallbackForTesting(
ControlEventCallback control_event_callback) {
DCHECK(control_event_callback_.is_null());
control_event_callback_ = control_event_callback;
}
void ExtensionAccessibilityEventRouter::ClearControlEventCallback() {
control_event_callback_.Reset();
}
void ExtensionAccessibilityEventRouter::HandleWindowEvent(
ui::AccessibilityTypes::Event event,
const AccessibilityWindowInfo* info) {
if (event == ui::AccessibilityTypes::EVENT_ALERT)
OnWindowOpened(info);
}
void ExtensionAccessibilityEventRouter::HandleMenuEvent(
ui::AccessibilityTypes::Event event,
const AccessibilityMenuInfo* info) {
switch (event) {
case ui::AccessibilityTypes::EVENT_MENUSTART:
case ui::AccessibilityTypes::EVENT_MENUPOPUPSTART:
OnMenuOpened(info);
break;
case ui::AccessibilityTypes::EVENT_MENUEND:
case ui::AccessibilityTypes::EVENT_MENUPOPUPEND:
OnMenuClosed(info);
break;
default:
NOTREACHED();
}
}
void ExtensionAccessibilityEventRouter::HandleControlEvent(
ui::AccessibilityTypes::Event event,
const AccessibilityControlInfo* info) {
if (!control_event_callback_.is_null())
control_event_callback_.Run(event, info);
switch (event) {
case ui::AccessibilityTypes::EVENT_TEXT_CHANGED:
case ui::AccessibilityTypes::EVENT_SELECTION_CHANGED:
OnTextChanged(info);
break;
case ui::AccessibilityTypes::EVENT_VALUE_CHANGED:
OnControlAction(info);
break;
case ui::AccessibilityTypes::EVENT_FOCUS:
OnControlFocused(info);
break;
default:
NOTREACHED();
}
}
void ExtensionAccessibilityEventRouter::OnWindowOpened(
const AccessibilityWindowInfo* info) {
scoped_ptr<ListValue> args(ControlInfoToEventArguments(info));
DispatchEvent(info->profile(), keys::kOnWindowOpened, args.Pass());
}
void ExtensionAccessibilityEventRouter::OnControlFocused(
const AccessibilityControlInfo* info) {
last_focused_control_dict_.Clear();
info->SerializeToDict(&last_focused_control_dict_);
scoped_ptr<ListValue> args(ControlInfoToEventArguments(info));
DispatchEvent(info->profile(), keys::kOnControlFocused, args.Pass());
}
void ExtensionAccessibilityEventRouter::OnControlAction(
const AccessibilityControlInfo* info) {
scoped_ptr<ListValue> args(ControlInfoToEventArguments(info));
DispatchEvent(info->profile(), keys::kOnControlAction, args.Pass());
}
void ExtensionAccessibilityEventRouter::OnTextChanged(
const AccessibilityControlInfo* info) {
scoped_ptr<ListValue> args(ControlInfoToEventArguments(info));
DispatchEvent(info->profile(), keys::kOnTextChanged, args.Pass());
}
void ExtensionAccessibilityEventRouter::OnMenuOpened(
const AccessibilityMenuInfo* info) {
scoped_ptr<ListValue> args(ControlInfoToEventArguments(info));
DispatchEvent(info->profile(), keys::kOnMenuOpened, args.Pass());
}
void ExtensionAccessibilityEventRouter::OnMenuClosed(
const AccessibilityMenuInfo* info) {
scoped_ptr<ListValue> args(ControlInfoToEventArguments(info));
DispatchEvent(info->profile(), keys::kOnMenuClosed, args.Pass());
}
void ExtensionAccessibilityEventRouter::DispatchEvent(
Profile* profile,
const char* event_name,
scoped_ptr<base::ListValue> event_args) {
if (enabled_ && profile &&
extensions::ExtensionSystem::Get(profile)->event_router()) {
scoped_ptr<extensions::Event> event(new extensions::Event(
event_name, event_args.Pass()));
extensions::ExtensionSystem::Get(profile)->event_router()->
BroadcastEvent(event.Pass());
}
}
bool AccessibilitySetAccessibilityEnabledFunction::RunImpl() {
bool enabled;
EXTENSION_FUNCTION_VALIDATE(args_->GetBoolean(0, &enabled));
ExtensionAccessibilityEventRouter::GetInstance()
->SetAccessibilityEnabled(enabled);
return true;
}
bool AccessibilitySetNativeAccessibilityEnabledFunction::RunImpl() {
bool enabled;
EXTENSION_FUNCTION_VALIDATE(args_->GetBoolean(0, &enabled));
if (enabled) {
content::BrowserAccessibilityState::GetInstance()->
EnableAccessibility();
} else {
content::BrowserAccessibilityState::GetInstance()->
DisableAccessibility();
}
return true;
}
bool AccessibilityGetFocusedControlFunction::RunImpl() {
// Get the serialized dict from the last focused control and return it.
// However, if the dict is empty, that means we haven't seen any focus
// events yet, so return null instead.
ExtensionAccessibilityEventRouter *accessibility_event_router =
ExtensionAccessibilityEventRouter::GetInstance();
DictionaryValue *last_focused_control_dict =
accessibility_event_router->last_focused_control_dict();
if (last_focused_control_dict->size()) {
SetResult(last_focused_control_dict->DeepCopyWithoutEmptyChildren());
} else {
SetResult(Value::CreateNullValue());
}
return true;
}
bool AccessibilityGetAlertsForTabFunction::RunImpl() {
int tab_id;
EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &tab_id));
TabStripModel* tab_strip = NULL;
content::WebContents* contents = NULL;
int tab_index = -1;
if (!ExtensionTabUtil::GetTabById(tab_id, profile(), include_incognito(),
NULL, &tab_strip, &contents, &tab_index)) {
error_ = extensions::ErrorUtils::FormatErrorMessage(
extensions::tabs_constants::kTabNotFoundError,
base::IntToString(tab_id));
return false;
}
ListValue* alerts_value = new ListValue;
InfoBarService* infobar_service = InfoBarService::FromWebContents(contents);
for (size_t i = 0; i < infobar_service->infobar_count(); ++i) {
// TODO(hashimoto): Make other kind of alerts available. crosbug.com/24281
ConfirmInfoBarDelegate* confirm_infobar_delegate =
infobar_service->infobar_at(i)->AsConfirmInfoBarDelegate();
if (confirm_infobar_delegate) {
DictionaryValue* alert_value = new DictionaryValue;
const string16 message_text = confirm_infobar_delegate->GetMessageText();
alert_value->SetString(keys::kMessageKey, message_text);
alerts_value->Append(alert_value);
}
}
SetResult(alerts_value);
return true;
}
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