// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/342213636): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "content/browser/accessibility/web_contents_accessibility_android.h"
#include <algorithm>
#include <memory>
#include <string>
#include <unordered_map>
#include <vector>
#include "base/android/callback_android.h"
#include "base/android/jni_android.h"
#include "base/android/jni_array.h"
#include "base/android/jni_string.h"
#include "base/debug/crash_logging.h"
#include "base/feature_list.h"
#include "base/hash/hash.h"
#include "base/types/fixed_array.h"
#include "content/browser/accessibility/accessibility_tree_snapshot_combiner.h"
#include "content/browser/accessibility/browser_accessibility_android.h"
#include "content/browser/accessibility/browser_accessibility_manager_android.h"
#include "content/browser/accessibility/browser_accessibility_state_impl_android.h"
#include "content/browser/android/render_widget_host_connector.h"
#include "content/browser/renderer_host/render_widget_host_view_android.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/common/content_features.h"
#include "net/base/data_url.h"
#include "ui/accessibility/accessibility_features.h"
#include "ui/accessibility/accessibility_prefs.h"
#include "ui/accessibility/ax_assistant_structure.h"
#include "ui/accessibility/ax_node_id_forward.h"
#include "ui/accessibility/platform/ax_android_constants.h"
#include "ui/accessibility/platform/one_shot_accessibility_tree_search.h"
#include "ui/events/android/motion_event_android.h"
// Must come after all headers that specialize FromJniType() / ToJniType().
#include "content/public/android/content_jni_headers/AccessibilityNodeInfoBuilder_jni.h"
#include "content/public/android/content_jni_headers/AssistDataBuilder_jni.h"
#include "content/public/android/content_jni_headers/WebContentsAccessibilityImpl_jni.h"
using base::android::AttachCurrentThread;
using base::android::JavaParamRef;
using base::android::ScopedJavaLocalRef;
namespace content {
namespace {
using SearchKeyToPredicateMap =
std::unordered_map<std::u16string, ui::AccessibilityMatchPredicate>;
base::LazyInstance<SearchKeyToPredicateMap>::Leaky
g_search_key_to_predicate_map = LAZY_INSTANCE_INITIALIZER;
base::LazyInstance<std::u16string>::Leaky g_all_search_keys =
LAZY_INSTANCE_INITIALIZER;
static const char kHtmlTypeRow[] = "ROW";
static const char kHtmlTypeColumn[] = "COLUMN";
static const char kHtmlTypeRowBounds[] = "ROW_BOUNDS";
static const char kHtmlTypeColumnBounds[] = "COLUMN_BOUNDS";
static const char kHtmlTypeTableBounds[] = "TABLE_BOUNDS";
bool AllInterestingNodesPredicate(ui::BrowserAccessibility* start,
ui::BrowserAccessibility* node) {
BrowserAccessibilityAndroid* android_node =
static_cast<BrowserAccessibilityAndroid*>(node);
return android_node->IsInterestingOnAndroid();
}
bool AccessibilityNoOpPredicate(ui::BrowserAccessibility* start,
ui::BrowserAccessibility* node) {
return true;
}
void AddToPredicateMap(const char* search_key_ascii,
ui::AccessibilityMatchPredicate predicate) {
std::u16string search_key_utf16 = base::ASCIIToUTF16(search_key_ascii);
g_search_key_to_predicate_map.Get()[search_key_utf16] = predicate;
if (!g_all_search_keys.Get().empty())
g_all_search_keys.Get() += u",";
g_all_search_keys.Get() += search_key_utf16;
}
// These are special unofficial strings sent from TalkBack/BrailleBack
// to jump to certain categories of web elements.
void InitSearchKeyToPredicateMapIfNeeded() {
if (!g_search_key_to_predicate_map.Get().empty())
return;
AddToPredicateMap("ARTICLE", ui::AccessibilityArticlePredicate);
AddToPredicateMap("BLOCKQUOTE", ui::AccessibilityBlockquotePredicate);
AddToPredicateMap("BUTTON", ui::AccessibilityButtonPredicate);
AddToPredicateMap("CHECKBOX", ui::AccessibilityCheckboxPredicate);
AddToPredicateMap("COMBOBOX", ui::AccessibilityComboboxPredicate);
AddToPredicateMap("CONTROL", ui::AccessibilityControlPredicate);
AddToPredicateMap("FOCUSABLE", ui::AccessibilityFocusablePredicate);
AddToPredicateMap("FRAME", ui::AccessibilityFramePredicate);
AddToPredicateMap("GRAPHIC", ui::AccessibilityGraphicPredicate);
AddToPredicateMap("H1", ui::AccessibilityH1Predicate);
AddToPredicateMap("H2", ui::AccessibilityH2Predicate);
AddToPredicateMap("H3", ui::AccessibilityH3Predicate);
AddToPredicateMap("H4", ui::AccessibilityH4Predicate);
AddToPredicateMap("H5", ui::AccessibilityH5Predicate);
AddToPredicateMap("H6", ui::AccessibilityH6Predicate);
AddToPredicateMap("HEADING", ui::AccessibilityHeadingPredicate);
AddToPredicateMap("HEADING_SAME", ui::AccessibilityHeadingSameLevelPredicate);
AddToPredicateMap("LANDMARK", ui::AccessibilityLandmarkPredicate);
AddToPredicateMap("LINK", ui::AccessibilityLinkPredicate);
AddToPredicateMap("LIST", ui::AccessibilityListPredicate);
AddToPredicateMap("LIST_ITEM", ui::AccessibilityListItemPredicate);
AddToPredicateMap("LIVE", ui::AccessibilityLiveRegionPredicate);
AddToPredicateMap("MAIN", ui::AccessibilityMainPredicate);
AddToPredicateMap("MEDIA", ui::AccessibilityMediaPredicate);
AddToPredicateMap("PARAGRAPH", ui::AccessibilityParagraphPredicate);
AddToPredicateMap("RADIO", ui::AccessibilityRadioButtonPredicate);
AddToPredicateMap("RADIO_GROUP", ui::AccessibilityRadioGroupPredicate);
AddToPredicateMap("SECTION", ui::AccessibilitySectionPredicate);
AddToPredicateMap("TABLE", ui::AccessibilityTablePredicate);
AddToPredicateMap("TEXT_FIELD", ui::AccessibilityTextfieldPredicate);
AddToPredicateMap("TEXT_BOLD", ui::AccessibilityTextStyleBoldPredicate);
AddToPredicateMap("TEXT_ITALIC", ui::AccessibilityTextStyleItalicPredicate);
AddToPredicateMap("TEXT_UNDERLINE",
ui::AccessibilityTextStyleUnderlinePredicate);
AddToPredicateMap("TREE", ui::AccessibilityTreePredicate);
AddToPredicateMap("UNVISITED_LINK", ui::AccessibilityUnvisitedLinkPredicate);
AddToPredicateMap("VISITED_LINK", ui::AccessibilityVisitedLinkPredicate);
// These are surfaced simply to document the html types, but do not do a
// tree/predicate search.
AddToPredicateMap(kHtmlTypeRow, AccessibilityNoOpPredicate);
AddToPredicateMap(kHtmlTypeColumn, AccessibilityNoOpPredicate);
AddToPredicateMap(kHtmlTypeRowBounds, AccessibilityNoOpPredicate);
AddToPredicateMap(kHtmlTypeColumnBounds, AccessibilityNoOpPredicate);
AddToPredicateMap(kHtmlTypeTableBounds, AccessibilityNoOpPredicate);
AddToPredicateMap(kHtmlTypeTableBounds, AccessibilityNoOpPredicate);
}
ui::AccessibilityMatchPredicate PredicateForSearchKey(
const std::u16string& element_type) {
InitSearchKeyToPredicateMapIfNeeded();
const auto& iter = g_search_key_to_predicate_map.Get().find(element_type);
if (iter != g_search_key_to_predicate_map.Get().end())
return iter->second;
// If we don't recognize the selector, return any element that a
// screen reader should navigate to.
return AllInterestingNodesPredicate;
}
// The element in the document for which we may be displaying an autofill popup.
int32_t g_element_hosting_autofill_popup_unique_id = ui::kInvalidAXNodeID;
// The element in the document that is the next element after
// |g_element_hosting_autofill_popup_unique_id|.
int32_t g_element_after_element_hosting_autofill_popup_unique_id =
ui::kInvalidAXNodeID;
// Autofill popup will not be part of the |AXTree| that is sent by renderer.
// Hence, we need a proxy |AXNode| to represent the autofill popup.
ui::BrowserAccessibility* g_autofill_popup_proxy_node = nullptr;
ui::AXNode* g_autofill_popup_proxy_node_ax_node = nullptr;
void DeleteAutofillPopupProxy() {
if (g_autofill_popup_proxy_node) {
delete g_autofill_popup_proxy_node;
delete g_autofill_popup_proxy_node_ax_node;
g_autofill_popup_proxy_node = nullptr;
}
}
// The most common use of the EXTRA_DATA_TEXT_CHARACTER_LOCATION_KEY
// API is to retrieve character bounds for one word at a time. There
// should never need to be a reason to return more than this many
// character bounding boxes at once. Set the limit much higher than needed
// but small enough to prevent wasting memory and cpu if abused.
const int kMaxCharacterBoundingBoxLen = 1024;
std::optional<int> MaybeFindRowColumn(ui::BrowserAccessibility* start_node,
std::u16string element_type,
jboolean forwards) {
bool want_row = base::EqualsASCII(element_type, kHtmlTypeRow);
bool want_col = base::EqualsASCII(element_type, kHtmlTypeColumn);
bool want_row_bounds = base::EqualsASCII(element_type, kHtmlTypeRowBounds);
bool want_col_bounds = base::EqualsASCII(element_type, kHtmlTypeColumnBounds);
bool want_table_bounds =
base::EqualsASCII(element_type, kHtmlTypeTableBounds);
if (!want_row && !want_col && !want_row_bounds && !want_col_bounds &&
!want_table_bounds) {
// The search should continue for other types.
return std::nullopt;
}
// See if we're in a table and grab the cell-like node we're under on the way.
ui::BrowserAccessibility* table_node = start_node;
ui::AXNode* cell_node = nullptr;
int cur_row_index, cur_col_index;
while (table_node) {
if (AccessibilityTablePredicate(start_node, table_node)) {
break;
}
auto* node = table_node->node();
if (std::optional<int> row = node->GetTableCellRowIndex(),
col = node->GetTableCellColIndex();
row && col) {
cell_node = node;
cur_row_index = *row;
cur_col_index = *col;
}
table_node = table_node->PlatformGetParent();
}
if (!table_node) {
return ui::kInvalidAXNodeID;
}
ui::AXTree* tree = start_node->node()->tree();
ui::AXTableInfo* table_info = tree->GetTableInfo(table_node->node());
if (!table_info) {
return ui::kInvalidAXNodeID;
}
// Nothing more to do if the table is empty.
if (table_info->cell_ids.empty()) {
return ui::kInvalidAXNodeID;
}
// This may occur if we're somewhere in the table but not within a cell e.g.
// on the table node itself. In these cases, try to go to the first cell.
if (!cell_node) {
return table_info->cell_ids[0].empty() ? ui::kInvalidAXNodeID
: table_info->cell_ids[0][0];
}
// Move in the desired direction by the element type.
int want_row_index = cur_row_index, want_col_index = cur_col_index;
if (want_row) {
want_row_index += forwards ? 1 : -1;
}
if (want_col) {
want_col_index += forwards ? 1 : -1;
}
if (want_col_bounds || want_table_bounds) {
want_row_index = forwards ? table_info->row_count - 1 : 0;
}
if (want_row_bounds || want_table_bounds) {
want_col_index = forwards ? table_info->col_count - 1 : 0;
}
// This causes the caller to stop its search and indicate appropriately when
// trying to move past a boundary.
if (want_row_index < 0 || (size_t)want_row_index >= table_info->row_count ||
want_col_index < 0 || (size_t)want_col_index >= table_info->col_count) {
return ui::kInvalidAXNodeID;
}
// This causes the caller to stop its search and indicate appropriately when
// trying to move to the same cell.
if ((want_row_bounds && want_col_index == cur_col_index) ||
(want_col_bounds && want_row_index == cur_row_index) ||
(want_table_bounds && want_row_index == cur_row_index &&
want_col_index == cur_col_index)) {
return ui::kInvalidAXNodeID;
}
return table_info->cell_ids[want_row_index][want_col_index];
}
} // anonymous namespace
class WebContentsAccessibilityAndroid::Connector
: public RenderWidgetHostConnector {
public:
Connector(WebContents* web_contents,
WebContentsAccessibilityAndroid* accessibility);
~Connector() override = default;
void DeleteEarly();
// RenderWidgetHostConnector:
void UpdateRenderProcessConnection(
RenderWidgetHostViewAndroid* old_rwhva,
RenderWidgetHostViewAndroid* new_rhwva) override;
private:
std::unique_ptr<WebContentsAccessibilityAndroid> accessibility_;
};
WebContentsAccessibilityAndroid::Connector::Connector(
WebContents* web_contents,
WebContentsAccessibilityAndroid* accessibility)
: RenderWidgetHostConnector(web_contents), accessibility_(accessibility) {
Initialize();
}
void WebContentsAccessibilityAndroid::Connector::DeleteEarly() {
RenderWidgetHostConnector::DestroyEarly();
}
void WebContentsAccessibilityAndroid::Connector::UpdateRenderProcessConnection(
RenderWidgetHostViewAndroid* old_rwhva,
RenderWidgetHostViewAndroid* new_rwhva) {
if (old_rwhva)
old_rwhva->SetWebContentsAccessibility(nullptr);
if (new_rwhva)
new_rwhva->SetWebContentsAccessibility(accessibility_.get());
accessibility_->UpdateBrowserAccessibilityManager();
}
WebContentsAccessibilityAndroid::WebContentsAccessibilityAndroid(
JNIEnv* env,
const JavaParamRef<jobject>& obj,
WebContents* web_contents,
const JavaParamRef<jobject>& jaccessibility_node_info_builder)
: java_ref_(env, obj),
java_anib_ref_(env, jaccessibility_node_info_builder),
web_contents_(static_cast<WebContentsImpl*>(web_contents)),
frame_info_initialized_(false) {
// We must initialize this after weak_ptr_factory_ because it can result in
// calling UpdateBrowserAccessibilityManager() which accesses
// weak_ptr_factory_.
connector_ = new Connector(web_contents, this);
}
WebContentsAccessibilityAndroid::WebContentsAccessibilityAndroid(
JNIEnv* env,
const JavaParamRef<jobject>& obj,
jlong ax_tree_update_ptr,
const JavaParamRef<jobject>& jaccessibility_node_info_builder)
: java_ref_(env, obj),
java_anib_ref_(env, jaccessibility_node_info_builder),
web_contents_(nullptr),
frame_info_initialized_(false) {
std::unique_ptr<ui::AXTreeUpdate> ax_tree_snapshot(
reinterpret_cast<ui::AXTreeUpdate*>(ax_tree_update_ptr));
snapshot_root_manager_ = std::make_unique<BrowserAccessibilityManagerAndroid>(
*ax_tree_snapshot, GetWeakPtr(), *this, nullptr);
snapshot_root_manager_->BuildAXTreeHitTestCache();
connector_ = nullptr;
}
WebContentsAccessibilityAndroid::WebContentsAccessibilityAndroid(
JNIEnv* env,
const JavaParamRef<jobject>& obj,
const JavaParamRef<jobject>& jassist_data_builder,
WebContents* web_contents)
: java_ref_(env, obj),
java_adb_ref_(env, jassist_data_builder),
web_contents_(static_cast<WebContentsImpl*>(web_contents)) {
// A Connector is not required for a simple snapshot.
connector_ = nullptr;
}
WebContentsAccessibilityAndroid::~WebContentsAccessibilityAndroid() {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
// Clean up autofill popup proxy node in case the popup was not dismissed.
DeleteAutofillPopupProxy();
Java_WebContentsAccessibilityImpl_onNativeObjectDestroyed(env, obj);
}
ui::AXPlatformNodeId WebContentsAccessibilityAndroid::GetOrCreateAXNodeUniqueId(
ui::AXNodeID ax_node_id) {
// Per-tab uniqueness is not necessary in snapshots, so return the blink node
// id.
return ui::AXPlatformNodeId(MakePassKey(), ax_node_id);
}
void WebContentsAccessibilityAndroid::OnAXNodeDeleted(ui::AXNodeID ax_node_id) {
}
void WebContentsAccessibilityAndroid::ConnectInstanceToRootManager(
JNIEnv* env) {
BrowserAccessibilityManagerAndroid* manager =
GetRootBrowserAccessibilityManager();
if (manager) {
manager->set_web_contents_accessibility(GetWeakPtr());
}
}
void WebContentsAccessibilityAndroid::UpdateBrowserAccessibilityManager() {
BrowserAccessibilityManagerAndroid* manager =
GetRootBrowserAccessibilityManager();
if (manager)
manager->set_web_contents_accessibility(GetWeakPtr());
}
void WebContentsAccessibilityAndroid::DeleteEarly(JNIEnv* env) {
if (connector_) {
connector_->DeleteEarly();
} else {
delete this;
}
}
void WebContentsAccessibilityAndroid::DisableRendererAccessibility(
JNIEnv* env) {
// This method should only be called when |snapshot_root_manager_| is null,
// which means this instance was constructed via a web contents and not an
// AXTreeUpdate (e.g. for snapshots, frozen tabs, paint preview, etc).
DCHECK(!snapshot_root_manager_);
// To disable the renderer, the root manager /should/ already be connected to
// this instance, and we need to reset the weak pointer it has to |this|. In
// some rare cases, such as if a user rapidly toggles accessibility on/off,
// a manager may not be connected, in which case a reset is not needed.
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (root_manager) {
root_manager->ResetWebContentsAccessibility();
}
// The local cache of Java strings can be cleared, and we should reset any
// local state variables. The Connector should continue to live, since we want
// the RFHI to still have access to this object for possible re-enables,
// or frame notifications.
common_string_cache_.clear();
ResetContentChangedEventsCounter();
// Turn off accessibility on the renderer side by resetting the AXMode.
BrowserAccessibilityStateImpl* accessibility_state =
BrowserAccessibilityStateImpl::GetInstance();
accessibility_state->ResetAccessibilityMode();
}
void WebContentsAccessibilityAndroid::ReEnableRendererAccessibility(
JNIEnv* env,
const JavaParamRef<jobject>& jweb_contents) {
// This method should only be called when |snapshot_root_manager_| is null,
// which means this instance was constructed via a web contents and not an
// AXTreeUpdate (e.g. for snapshots, frozen tabs, paint preview, etc).
DCHECK(!snapshot_root_manager_);
WebContents* web_contents = WebContents::FromJavaWebContents(jweb_contents);
DCHECK(web_contents);
// A request to re-enable renderer accessibility implies AT use on the
// Java-side, so we need to set the root manager's reference to |this| to
// rebuild the C++ -> Java bridge. The web contents may have changed, so
// update the reference just in case.
web_contents_ = static_cast<WebContentsImpl*>(web_contents);
// If we are re-enabling, the root manager may already be connected, in which
// case we can set its weak pointer to |this|. However, if a user has rapidly
// turned accessibility on/off, the manager may not be ready. If the manager
// is not ready, the framework will continue polling until it is connected.
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (root_manager) {
root_manager->set_web_contents_accessibility(GetWeakPtr());
}
}
jboolean WebContentsAccessibilityAndroid::IsRootManagerConnected(JNIEnv* env) {
return !!GetRootBrowserAccessibilityManager();
}
void WebContentsAccessibilityAndroid::SetAllowImageDescriptions(
JNIEnv* env,
jboolean allow_image_descriptions) {
allow_image_descriptions_ = allow_image_descriptions;
}
void WebContentsAccessibilityAndroid::HandleContentChanged(int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
// If there are a large number of changes it's too expensive to fire all of
// them, so we just fire one on the root instead.
content_changed_events_++;
if (content_changed_events_ < max_content_changed_events_to_fire_) {
// If it's less than the max event count, fire the event on the specific
// node that changed.
Java_WebContentsAccessibilityImpl_handleContentChanged(env, obj, unique_id);
} else if (content_changed_events_ == max_content_changed_events_to_fire_) {
// If it's equal to the max event count, fire the event on the
// root instead.
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (root_manager) {
auto* root_node = static_cast<BrowserAccessibilityAndroid*>(
root_manager->GetBrowserAccessibilityRoot());
if (root_node) {
Java_WebContentsAccessibilityImpl_handleContentChanged(
env, obj, root_node->GetUniqueId());
}
}
}
}
void WebContentsAccessibilityAndroid::HandleFocusChanged(int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleFocusChanged(env, obj, unique_id);
}
void WebContentsAccessibilityAndroid::HandleCheckStateChanged(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleCheckStateChanged(env, obj,
unique_id);
}
void WebContentsAccessibilityAndroid::HandleStateDescriptionChanged(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleStateDescriptionChanged(env, obj,
unique_id);
}
void WebContentsAccessibilityAndroid::HandleClicked(int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleClicked(env, obj, unique_id);
}
void WebContentsAccessibilityAndroid::HandleScrollPositionChanged(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleScrollPositionChanged(env, obj,
unique_id);
}
void WebContentsAccessibilityAndroid::HandleScrolledToAnchor(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleScrolledToAnchor(env, obj, unique_id);
}
void WebContentsAccessibilityAndroid::HandleDialogModalOpened(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleDialogModalOpened(env, obj,
unique_id);
}
void WebContentsAccessibilityAndroid::AnnounceLiveRegionText(
const std::u16string& text) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
// Do not announce empty text.
if (text.empty())
return;
Java_WebContentsAccessibilityImpl_announceLiveRegionText(
env, obj, base::android::ConvertUTF16ToJavaString(env, text));
}
void WebContentsAccessibilityAndroid::HandleTextContentChanged(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleTextContentChanged(env, obj,
unique_id);
}
void WebContentsAccessibilityAndroid::HandleTextSelectionChanged(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleTextSelectionChanged(env, obj,
unique_id);
}
void WebContentsAccessibilityAndroid::HandleEditableTextChanged(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleEditableTextChanged(env, obj,
unique_id);
}
void WebContentsAccessibilityAndroid::SignalEndOfTestForTesting(JNIEnv* env) {
ui::BrowserAccessibilityManager* manager =
web_contents_->GetRootBrowserAccessibilityManager();
manager->SignalEndOfTest();
}
void WebContentsAccessibilityAndroid::HandleEndOfTestSignal() {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleEndOfTestSignal(env, obj);
}
void WebContentsAccessibilityAndroid::HandleSliderChanged(int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleSliderChanged(env, obj, unique_id);
}
void WebContentsAccessibilityAndroid::SendDelayedWindowContentChangedEvent() {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_sendDelayedWindowContentChangedEvent(env,
obj);
}
void WebContentsAccessibilityAndroid::HandleHover(int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleHover(env, obj, unique_id);
}
bool WebContentsAccessibilityAndroid::OnHoverEvent(
const ui::MotionEventAndroid& event) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return false;
if (!Java_WebContentsAccessibilityImpl_onHoverEvent(
env, obj,
ui::MotionEventAndroid::GetAndroidAction(event.GetAction())))
return false;
// |HitTest| sends an IPC to the render process to do the hit testing.
// The response is handled by HandleHover when it returns.
// Hover event was consumed by accessibility by now. Return true to
// stop the event from proceeding.
if (event.GetAction() != ui::MotionEvent::Action::HOVER_EXIT &&
GetRootBrowserAccessibilityManager()) {
gfx::PointF point = event.GetPointPix();
point.Scale(1 / page_scale_);
GetRootBrowserAccessibilityManager()->HitTest(gfx::ToFlooredPoint(point),
/*request_id=*/0);
}
return true;
}
bool WebContentsAccessibilityAndroid::OnHoverEventNoRenderer(JNIEnv* env,
jfloat x,
jfloat y) {
gfx::PointF point = gfx::PointF(x, y);
if (BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager()) {
auto* hover_node = static_cast<BrowserAccessibilityAndroid*>(
root_manager->ApproximateHitTest(gfx::ToFlooredPoint(point)));
if (hover_node &&
hover_node != root_manager->GetBrowserAccessibilityRoot()) {
HandleHover(hover_node->GetUniqueId());
return true;
}
}
return false;
}
void WebContentsAccessibilityAndroid::HandleNavigate(int32_t root_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_handleNavigate(env, obj, root_id);
}
void WebContentsAccessibilityAndroid::UpdateMaxNodesInCache() {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_updateMaxNodesInCache(env, obj);
}
void WebContentsAccessibilityAndroid::ClearNodeInfoCacheForGivenId(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_clearNodeInfoCacheForGivenId(env, obj,
unique_id);
}
std::u16string
WebContentsAccessibilityAndroid::GenerateAccessibilityNodeInfoString(
int32_t unique_id) {
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return {};
return base::android::ConvertJavaStringToUTF16(
Java_WebContentsAccessibilityImpl_generateAccessibilityNodeInfoString(
env, obj, unique_id));
}
base::android::ScopedJavaLocalRef<jstring>
WebContentsAccessibilityAndroid::GetSupportedHtmlElementTypes(JNIEnv* env) {
InitSearchKeyToPredicateMapIfNeeded();
return GetCanonicalJNIString(env, g_all_search_keys.Get()).AsLocalRef(env);
}
jint WebContentsAccessibilityAndroid::GetRootId(JNIEnv* env) {
if (BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager()) {
auto* root = static_cast<BrowserAccessibilityAndroid*>(
root_manager->GetBrowserAccessibilityRoot());
if (root)
return static_cast<jint>(root->GetUniqueId());
}
return ui::kAXAndroidInvalidViewId;
}
jboolean WebContentsAccessibilityAndroid::IsNodeValid(JNIEnv* env,
jint unique_id) {
return GetAXFromUniqueID(unique_id) != nullptr;
}
void WebContentsAccessibilityAndroid::HitTest(JNIEnv* env, jint x, jint y) {
if (BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager())
root_manager->HitTest(gfx::Point(x, y), /*request_id=*/0);
}
jboolean WebContentsAccessibilityAndroid::IsEditableText(JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
return node->IsTextField();
}
jboolean WebContentsAccessibilityAndroid::IsFocused(JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
return node->IsFocused();
}
jint WebContentsAccessibilityAndroid::GetEditableTextSelectionStart(
JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
return node->GetSelectionStart();
}
jint WebContentsAccessibilityAndroid::GetEditableTextSelectionEnd(
JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
return node->GetSelectionEnd();
}
ScopedJavaLocalRef<jintArray>
WebContentsAccessibilityAndroid::GetAbsolutePositionForNode(JNIEnv* env,
jint unique_id) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return nullptr;
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return nullptr;
float dip_scale = 1 / root_manager->device_scale_factor();
gfx::Rect absolute_rect = gfx::ScaleToEnclosingRect(
node->GetUnclippedRootFrameBoundsRect(), dip_scale, dip_scale);
int rect[4] = {absolute_rect.x(), absolute_rect.y(), absolute_rect.right(),
absolute_rect.bottom()};
return base::android::ToJavaIntArray(env, rect, static_cast<size_t>(4));
}
static size_t ActualUnignoredChildCount(const ui::AXNode* node) {
size_t count = 0;
for (const ui::AXNode* child : node->children()) {
if (child->IsIgnored()) {
count += ActualUnignoredChildCount(child);
} else {
++count;
}
}
return count;
}
void WebContentsAccessibilityAndroid::UpdateAccessibilityNodeInfoBoundsRect(
JNIEnv* env,
const ScopedJavaLocalRef<jobject>& obj,
const JavaParamRef<jobject>& info,
jint unique_id,
BrowserAccessibilityAndroid* node) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return;
ui::AXOffscreenResult offscreen_result = ui::AXOffscreenResult::kOnscreen;
float dip_scale = 1 / root_manager->device_scale_factor();
gfx::Rect absolute_rect = gfx::ScaleToEnclosingRect(
node->GetUnclippedRootFrameBoundsRect(&offscreen_result), dip_scale,
dip_scale);
gfx::Rect parent_relative_rect = absolute_rect;
if (node->PlatformGetParent()) {
gfx::Rect parent_rect = gfx::ScaleToEnclosingRect(
node->PlatformGetParent()->GetUnclippedRootFrameBoundsRect(), dip_scale,
dip_scale);
parent_relative_rect.Offset(-parent_rect.OffsetFromOrigin());
}
bool is_offscreen = offscreen_result == ui::AXOffscreenResult::kOffscreen;
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoLocation(
env, obj, info, unique_id, absolute_rect.x(), absolute_rect.y(),
parent_relative_rect.x(), parent_relative_rect.y(), absolute_rect.width(),
absolute_rect.height(), is_offscreen);
}
jboolean WebContentsAccessibilityAndroid::UpdateCachedAccessibilityNodeInfo(
JNIEnv* env,
const JavaParamRef<jobject>& info,
jint unique_id) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return false;
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
ScopedJavaLocalRef<jobject> obj = java_anib_ref_.get(env);
if (obj.is_null())
return false;
// Update cached nodes by providing new enclosing Rects
UpdateAccessibilityNodeInfoBoundsRect(env, obj, info, unique_id, node);
return true;
}
jboolean WebContentsAccessibilityAndroid::PopulateAccessibilityNodeInfo(
JNIEnv* env,
const JavaParamRef<jobject>& info,
jint unique_id) {
if (!GetRootBrowserAccessibilityManager())
return false;
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
ScopedJavaLocalRef<jobject> obj = java_anib_ref_.get(env);
if (obj.is_null())
return false;
int parent_id = ui::kAXAndroidInvalidViewId;
auto* parent_node =
static_cast<BrowserAccessibilityAndroid*>(node->PlatformGetParent());
if (parent_node)
parent_id = parent_node->GetUniqueId();
// Build a vector of child ids
std::vector<int> child_ids;
for (const auto& child : node->PlatformChildren()) {
const auto& android_node =
static_cast<const BrowserAccessibilityAndroid&>(child);
child_ids.push_back(android_node.GetUniqueId());
}
if (child_ids.size()) {
Java_AccessibilityNodeInfoBuilder_addAccessibilityNodeInfoChildren(
env, obj, info, base::android::ToJavaIntArray(env, child_ids));
}
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoBooleanAttributes(
env, obj, info, unique_id, node->IsReportingCheckable(),
node->IsChecked(), node->IsClickable(), node->IsContentInvalid(),
node->IsEnabled(), node->IsFocusable(), node->IsFocused(),
node->HasImage(), node->IsPasswordField(), node->IsScrollable(),
node->IsSelected(), node->IsVisibleToUser(),
node->HasCharacterLocations());
Java_AccessibilityNodeInfoBuilder_addAccessibilityNodeInfoActions(
env, obj, info, unique_id, node->CanScrollForward(),
node->CanScrollBackward(), node->CanScrollUp(), node->CanScrollDown(),
node->CanScrollLeft(), node->CanScrollRight(), node->IsClickable(),
node->IsTextField(), node->IsEnabled(), node->IsFocusable(),
node->IsFocused(), node->IsCollapsed(), node->IsExpanded(),
node->HasNonEmptyValue(), !node->GetTextContentUTF16().empty(),
node->IsSeekControl(), node->IsFormDescendant());
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoBaseAttributes(
env, obj, info, unique_id, parent_id,
GetCanonicalJNIString(env, node->GetClassName()),
GetCanonicalJNIString(env, node->GetRoleString()),
GetCanonicalJNIString(env, node->GetRoleDescription()),
base::android::ConvertUTF16ToJavaString(env, node->GetHint()),
base::android::ConvertUTF16ToJavaString(env, node->GetTargetUrl()),
node->CanOpenPopup(), node->IsMultiLine(), node->AndroidInputType(),
node->AndroidLiveRegionType(),
GetCanonicalJNIString(env, node->GetContentInvalidErrorMessage()),
node->ClickableScore(),
GetCanonicalJNIString(env, node->GetCSSDisplay()),
base::android::ConvertUTF16ToJavaString(env, node->GetBrailleLabel()),
GetCanonicalJNIString(env, node->GetBrailleRoleDescription()));
ScopedJavaLocalRef<jintArray> suggestion_starts_java;
ScopedJavaLocalRef<jintArray> suggestion_ends_java;
ScopedJavaLocalRef<jobjectArray> suggestion_text_java;
std::vector<int> suggestion_starts;
std::vector<int> suggestion_ends;
node->GetSuggestions(&suggestion_starts, &suggestion_ends);
if (suggestion_starts.size() && suggestion_ends.size()) {
suggestion_starts_java = base::android::ToJavaIntArray(
env, suggestion_starts.data(), suggestion_starts.size());
suggestion_ends_java = base::android::ToJavaIntArray(
env, suggestion_ends.data(), suggestion_ends.size());
// Currently we don't retrieve the text of each suggestion, so
// store a blank string for now.
std::vector<std::string> suggestion_text(suggestion_starts.size());
suggestion_text_java =
base::android::ToJavaArrayOfStrings(env, suggestion_text);
}
bool is_link = ui::IsLink(node->GetRole());
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoText(
env, obj, info,
base::android::ConvertUTF16ToJavaString(env, node->GetTextContentUTF16()),
is_link
? base::android::ConvertUTF16ToJavaString(env, node->GetTargetUrl())
: base::android::ConvertUTF16ToJavaString(env, std::u16string()),
is_link, node->IsTextField(),
GetCanonicalJNIString(env, node->GetInheritedString16Attribute(
ax::mojom::StringAttribute::kLanguage)),
suggestion_starts_java, suggestion_ends_java, suggestion_text_java,
base::android::ConvertUTF16ToJavaString(env,
node->GetStateDescription()));
std::u16string element_id;
if (node->GetString16Attribute(ax::mojom::StringAttribute::kHtmlId,
&element_id)) {
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoViewIdResourceName(
env, obj, info,
base::android::ConvertUTF16ToJavaString(env, element_id));
}
UpdateAccessibilityNodeInfoBoundsRect(env, obj, info, unique_id, node);
if (node->IsCollection()) {
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoCollectionInfo(
env, obj, info, node->RowCount(), node->ColumnCount(),
node->IsHierarchical());
}
if (node->IsCollectionItem() || node->IsTableHeader()) {
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoCollectionItemInfo(
env, obj, info, node->RowIndex(), node->RowSpan(), node->ColumnIndex(),
node->ColumnSpan(), node->IsTableHeader());
}
// For sliders that are numeric, use the AccessibilityNodeInfo.RangeInfo
// object as expected. But for non-numeric ranges (e.g. "small", "medium",
// "large"), do not set the RangeInfo object and instead rely on announcing
// the aria-valuetext value, which will be included in the node's text value.
if (node->IsRangeControlWithoutAriaValueText()) {
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoRangeInfo(
env, obj, info, node->AndroidRangeType(), node->RangeMin(),
node->RangeMax(), node->RangeCurrentValue());
}
if (ui::IsDialog(node->GetRole())) {
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoPaneTitle(
env, obj, info,
base::android::ConvertUTF16ToJavaString(
env, node->GetDialogModalMessageText()));
}
if (node->IsTextField()) {
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoSelectionAttrs(
env, obj, info, node->GetSelectionStart(), node->GetSelectionEnd());
}
return true;
}
jboolean WebContentsAccessibilityAndroid::PopulateAccessibilityEvent(
JNIEnv* env,
const JavaParamRef<jobject>& event,
jint unique_id,
jint event_type) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return false;
// We will always set boolean, classname, list and scroll attributes.
Java_WebContentsAccessibilityImpl_setAccessibilityEventBaseAttributes(
env, obj, event, node->IsChecked(), node->IsEnabled(),
node->IsPasswordField(), node->IsScrollable(), node->GetItemIndex(),
node->GetItemCount(), node->GetScrollX(), node->GetScrollY(),
node->GetMaxScrollX(), node->GetMaxScrollY(),
GetCanonicalJNIString(env, node->GetClassName()));
switch (event_type) {
case ANDROID_ACCESSIBILITY_EVENT_TEXT_CHANGED: {
std::u16string before_text = node->GetTextChangeBeforeText();
std::u16string text = node->GetTextContentUTF16();
Java_WebContentsAccessibilityImpl_setAccessibilityEventTextChangedAttrs(
env, obj, event, node->GetTextChangeFromIndex(),
node->GetTextChangeAddedCount(), node->GetTextChangeRemovedCount(),
base::android::ConvertUTF16ToJavaString(env, before_text),
base::android::ConvertUTF16ToJavaString(env, text));
break;
}
case ANDROID_ACCESSIBILITY_EVENT_TEXT_SELECTION_CHANGED: {
std::u16string text = node->GetTextContentUTF16();
Java_WebContentsAccessibilityImpl_setAccessibilityEventSelectionAttrs(
env, obj, event, node->GetSelectionStart(), node->GetSelectionEnd(),
node->GetEditableTextLength(),
base::android::ConvertUTF16ToJavaString(env, text));
break;
}
default:
break;
}
return true;
}
void WebContentsAccessibilityAndroid::Click(JNIEnv* env, jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return;
// If it's a heading consisting of only a link, click the link.
if (node->IsHeadingLink()) {
node = static_cast<BrowserAccessibilityAndroid*>(
node->InternalChildrenBegin().get());
}
// Only perform the default action on a node that is enabled. Having the
// ACTION_CLICK action on the node is not sufficient, since TalkBack won't
// announce a control as disabled unless it's also marked as clickable, so
// disabled nodes are secretly clickable if we do not check here.
// Children of disabled controls/widgets will also have the click action, so
// ensure that parents/ancestry chain is enabled as well.
if (node->IsEnabled() && !node->IsDisabledDescendant())
node->manager()->DoDefaultAction(*node);
}
void WebContentsAccessibilityAndroid::Focus(JNIEnv* env, jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (node)
node->manager()->SetFocus(*node);
}
void WebContentsAccessibilityAndroid::Blur(JNIEnv* env) {
if (BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager())
root_manager->SetFocus(*root_manager->GetBrowserAccessibilityRoot());
}
void WebContentsAccessibilityAndroid::ScrollToMakeNodeVisible(JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (node) {
node->manager()->ScrollToMakeVisible(
*node, gfx::Rect(node->GetUnclippedFrameBoundsRect().size()));
}
}
void WebContentsAccessibilityAndroid::SetTextFieldValue(
JNIEnv* env,
jint unique_id,
const JavaParamRef<jstring>& value) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (node) {
node->manager()->SetValue(
*node, base::android::ConvertJavaStringToUTF8(env, value));
}
}
void WebContentsAccessibilityAndroid::SetSelection(JNIEnv* env,
jint unique_id,
jint start,
jint end) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (node) {
node->manager()->SetSelection(ui::BrowserAccessibility::AXRange(
node->CreatePositionForSelectionAt(start),
node->CreatePositionForSelectionAt(end)));
}
}
jboolean WebContentsAccessibilityAndroid::AdjustSlider(JNIEnv* env,
jint unique_id,
jboolean increment) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
BrowserAccessibilityAndroid* android_node =
static_cast<BrowserAccessibilityAndroid*>(node);
if (!android_node->IsSlider() || !android_node->IsEnabled())
return false;
float value =
node->GetFloatAttribute(ax::mojom::FloatAttribute::kValueForRange);
float min =
node->GetFloatAttribute(ax::mojom::FloatAttribute::kMinValueForRange);
float max =
node->GetFloatAttribute(ax::mojom::FloatAttribute::kMaxValueForRange);
if (max <= min)
return false;
// If this node has defined a step value, move by that amount. Otherwise, to
// behave similarly to an Android SeekBar, move by an increment of ~5%.
float delta;
if (node->HasFloatAttribute(ax::mojom::FloatAttribute::kStepValueForRange)) {
delta =
node->GetFloatAttribute(ax::mojom::FloatAttribute::kStepValueForRange);
} else {
delta = (max - min) / kDefaultNumberOfTicksForSliders;
}
// Add/Subtract based on |increment| boolean, then clamp to range.
float original_value = value;
value += (increment ? delta : -delta);
value = std::clamp(value, min, max);
if (value != original_value) {
node->manager()->SetValue(*node, base::NumberToString(value));
return true;
}
return false;
}
void WebContentsAccessibilityAndroid::ShowContextMenu(JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (node)
node->manager()->ShowContextMenu(*node);
}
jint WebContentsAccessibilityAndroid::FindElementType(
JNIEnv* env,
jint start_id,
const JavaParamRef<jstring>& element_type_str,
jboolean forwards,
jboolean can_wrap_to_last_element,
jboolean use_default_predicate) {
BrowserAccessibilityAndroid* start_node = GetAXFromUniqueID(start_id);
if (!start_node)
return ui::kInvalidAXNodeID;
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return ui::kInvalidAXNodeID;
ui::BrowserAccessibility* root = root_manager->GetBrowserAccessibilityRoot();
if (!root)
return ui::kInvalidAXNodeID;
// If |element_type_str| was empty, we can skip to the default predicate.
ui::AccessibilityMatchPredicate predicate;
if (use_default_predicate) {
predicate = AllInterestingNodesPredicate;
} else {
const auto element_type =
base::android::ConvertJavaStringToUTF16(env, element_type_str);
if (std::optional<int> ret =
MaybeFindRowColumn(start_node, element_type, forwards);
ret) {
ui::BrowserAccessibility* node = start_node->manager()->GetFromID(*ret);
return node ? static_cast<BrowserAccessibilityAndroid*>(node)
->GetUniqueId()
: ui::kInvalidAXNodeID;
}
predicate = PredicateForSearchKey(element_type);
}
ui::OneShotAccessibilityTreeSearch tree_search(root);
tree_search.SetStartNode(start_node);
tree_search.SetDirection(forwards
? ui::OneShotAccessibilityTreeSearch::FORWARDS
: ui::OneShotAccessibilityTreeSearch::BACKWARDS);
tree_search.SetResultLimit(1);
tree_search.SetImmediateDescendantsOnly(false);
tree_search.SetCanWrapToLastElement(can_wrap_to_last_element);
tree_search.SetOnscreenOnly(false);
tree_search.AddPredicate(predicate);
if (tree_search.CountMatches() == 0)
return ui::kInvalidAXNodeID;
auto* android_node =
static_cast<BrowserAccessibilityAndroid*>(tree_search.GetMatchAtIndex(0));
int32_t element_id = android_node->GetUniqueId();
// Navigate forwards to the autofill popup's proxy node if focus is currently
// on the element hosting the autofill popup. Once within the popup, a back
// press will navigate back to the element hosting the popup. If user swipes
// past last suggestion in the popup, or swipes left from the first suggestion
// in the popup, we will navigate to the element that is the next element in
// the document after the element hosting the popup.
if (forwards && start_id == g_element_hosting_autofill_popup_unique_id &&
g_autofill_popup_proxy_node) {
g_element_after_element_hosting_autofill_popup_unique_id = element_id;
auto* proxy_android_node =
static_cast<BrowserAccessibilityAndroid*>(g_autofill_popup_proxy_node);
return proxy_android_node->GetUniqueId();
}
return element_id;
}
jboolean WebContentsAccessibilityAndroid::NextAtGranularity(
JNIEnv* env,
jint granularity,
jboolean extend_selection,
jint unique_id,
jint cursor_index) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return false;
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
jint start_index = -1;
int end_index = -1;
if (root_manager->NextAtGranularity(granularity, cursor_index, node,
&start_index, &end_index)) {
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return false;
std::u16string text = node->GetTextContentUTF16();
Java_WebContentsAccessibilityImpl_finishGranularityMoveNext(
env, obj, base::android::ConvertUTF16ToJavaString(env, text),
extend_selection, start_index, end_index);
return true;
}
return false;
}
jint WebContentsAccessibilityAndroid::GetTextLength(JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return -1;
std::u16string text = node->GetTextContentUTF16();
return text.size();
}
void WebContentsAccessibilityAndroid::AddSpellingErrorForTesting(
JNIEnv* env,
jint unique_id,
jint start_offset,
jint end_offset) {
ui::BrowserAccessibility* node = GetAXFromUniqueID(unique_id);
CHECK(node);
while (node->GetRole() != ax::mojom::Role::kStaticText &&
node->InternalChildCount() > 0) {
node = node->InternalChildrenBegin().get();
}
CHECK(node->GetRole() == ax::mojom::Role::kStaticText);
std::u16string text = node->GetTextContentUTF16();
CHECK_LT(start_offset, static_cast<int>(text.size()));
CHECK_LE(end_offset, static_cast<int>(text.size()));
ui::AXNodeData data = node->GetData();
data.AddIntListAttribute(ax::mojom::IntListAttribute::kMarkerStarts,
{start_offset});
data.AddIntListAttribute(ax::mojom::IntListAttribute::kMarkerEnds,
{end_offset});
data.AddIntListAttribute(
ax::mojom::IntListAttribute::kMarkerTypes,
{static_cast<int>(ax::mojom::MarkerType::kSuggestion)});
node->node()->SetData(data);
}
jboolean WebContentsAccessibilityAndroid::PreviousAtGranularity(
JNIEnv* env,
jint granularity,
jboolean extend_selection,
jint unique_id,
jint cursor_index) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return false;
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
jint start_index = -1;
int end_index = -1;
if (root_manager->PreviousAtGranularity(granularity, cursor_index, node,
&start_index, &end_index)) {
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return false;
Java_WebContentsAccessibilityImpl_finishGranularityMovePrevious(
env, obj,
base::android::ConvertUTF16ToJavaString(env,
node->GetTextContentUTF16()),
extend_selection, start_index, end_index);
return true;
}
return false;
}
void WebContentsAccessibilityAndroid::MoveAccessibilityFocus(
JNIEnv* env,
jint old_unique_id,
jint new_unique_id) {
BrowserAccessibilityAndroid* old_node = GetAXFromUniqueID(old_unique_id);
if (old_node)
old_node->manager()->ClearAccessibilityFocus(*old_node);
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(new_unique_id);
if (!node)
return;
node->manager()->SetAccessibilityFocus(*node);
// When Android sets accessibility focus to a node, we load inline text
// boxes for that node so that subsequent requests for character bounding
// boxes will succeed. However, don't do that for the root of the tree,
// as that will result in loading inline text boxes for the whole tree.
if (node != node->manager()->GetBrowserAccessibilityRoot())
node->manager()->LoadInlineTextBoxes(*node);
}
bool WebContentsAccessibilityAndroid::IsSlider(JNIEnv* env, jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
return node->GetRole() == ax::mojom::Role::kSlider;
}
void WebContentsAccessibilityAndroid::OnAutofillPopupDisplayed(JNIEnv* env) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return;
ui::BrowserAccessibility* current_focus = root_manager->GetFocus();
if (!current_focus) {
return;
}
DeleteAutofillPopupProxy();
// The node is isolated (tree is nullptr) and its id is not important,
// it should only be not equal to kInvalidAXNodeID to be considered valid.
ui::AXNodeID id = ~ui::kInvalidAXNodeID;
g_autofill_popup_proxy_node_ax_node = new ui::AXNode(nullptr, nullptr, id, 0);
ui::AXNodeData ax_node_data;
ax_node_data.id = id;
ax_node_data.role = ax::mojom::Role::kMenu;
ax_node_data.SetName("Autofill");
ax_node_data.SetRestriction(ax::mojom::Restriction::kReadOnly);
ax_node_data.AddState(ax::mojom::State::kFocusable);
ax_node_data.AddBoolAttribute(ax::mojom::BoolAttribute::kSelected, false);
g_autofill_popup_proxy_node_ax_node->SetData(ax_node_data);
g_autofill_popup_proxy_node =
ui::BrowserAccessibility::Create(root_manager,
g_autofill_popup_proxy_node_ax_node)
.release();
auto* android_node = static_cast<BrowserAccessibilityAndroid*>(current_focus);
g_element_hosting_autofill_popup_unique_id = android_node->GetUniqueId();
}
void WebContentsAccessibilityAndroid::OnAutofillPopupDismissed(JNIEnv* env) {
g_element_hosting_autofill_popup_unique_id = -1;
g_element_after_element_hosting_autofill_popup_unique_id = -1;
DeleteAutofillPopupProxy();
}
jint WebContentsAccessibilityAndroid::
GetIdForElementAfterElementHostingAutofillPopup(JNIEnv* env) {
if (g_element_after_element_hosting_autofill_popup_unique_id == -1 ||
!GetAXFromUniqueID(
g_element_after_element_hosting_autofill_popup_unique_id))
return ui::kInvalidAXNodeID;
return g_element_after_element_hosting_autofill_popup_unique_id;
}
jboolean WebContentsAccessibilityAndroid::IsAutofillPopupNode(JNIEnv* env,
jint unique_id) {
auto* android_node =
static_cast<BrowserAccessibilityAndroid*>(g_autofill_popup_proxy_node);
return g_autofill_popup_proxy_node &&
android_node->GetUniqueId() == unique_id;
}
bool WebContentsAccessibilityAndroid::Scroll(JNIEnv* env,
jint unique_id,
int direction,
bool is_page_scroll) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
return node->Scroll(direction, is_page_scroll);
}
bool WebContentsAccessibilityAndroid::SetRangeValue(JNIEnv* env,
jint unique_id,
float value) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
BrowserAccessibilityAndroid* android_node =
static_cast<BrowserAccessibilityAndroid*>(node);
if (!android_node->GetData().IsRangeValueSupported())
return false;
float min =
node->GetFloatAttribute(ax::mojom::FloatAttribute::kMinValueForRange);
float max =
node->GetFloatAttribute(ax::mojom::FloatAttribute::kMaxValueForRange);
if (max <= min)
return false;
value = std::clamp(value, min, max);
node->manager()->SetValue(*node, base::NumberToString(value));
return true;
}
jboolean WebContentsAccessibilityAndroid::AreInlineTextBoxesLoaded(
JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
return node->AreInlineTextBoxesLoaded();
}
void WebContentsAccessibilityAndroid::LoadInlineTextBoxes(JNIEnv* env,
jint unique_id) {
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (node)
node->manager()->LoadInlineTextBoxes(*node);
}
ScopedJavaLocalRef<jintArray>
WebContentsAccessibilityAndroid::GetCharacterBoundingBoxes(JNIEnv* env,
jint unique_id,
jint start,
jint len) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return nullptr;
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return nullptr;
if (len <= 0 || len > kMaxCharacterBoundingBoxLen) {
LOG(ERROR) << "Trying to request EXTRA_DATA_TEXT_CHARACTER_LOCATION_KEY "
<< "with a length of " << len << ". Valid values are between 1 "
<< "and " << kMaxCharacterBoundingBoxLen;
return nullptr;
}
float dip_scale = 1 / root_manager->device_scale_factor();
gfx::Rect object_bounds = node->GetUnclippedRootFrameBoundsRect();
base::FixedArray<int> coords(4 * len);
for (int i = 0; i < len; i++) {
gfx::Rect char_bounds = node->GetUnclippedRootFrameInnerTextRangeBoundsRect(
start + i, start + i + 1);
if (char_bounds.IsEmpty())
char_bounds = object_bounds;
char_bounds = gfx::ScaleToEnclosingRect(char_bounds, dip_scale, dip_scale);
coords[4 * i + 0] = char_bounds.x();
coords[4 * i + 1] = char_bounds.y();
coords[4 * i + 2] = char_bounds.right();
coords[4 * i + 3] = char_bounds.bottom();
}
return base::android::ToJavaIntArray(env, coords.data(),
static_cast<size_t>(4 * len));
}
jboolean WebContentsAccessibilityAndroid::GetImageData(
JNIEnv* env,
const JavaParamRef<jobject>& info,
jint unique_id,
jboolean has_sent_previous_request) {
BrowserAccessibilityManagerAndroid* root_manager =
GetRootBrowserAccessibilityManager();
if (!root_manager)
return false;
BrowserAccessibilityAndroid* node = GetAXFromUniqueID(unique_id);
if (!node)
return false;
// If this is a valid node, try to get an image data url for it.
std::string image_data_url =
node->GetStringAttribute(ax::mojom::StringAttribute::kImageDataUrl);
std::string mimetype;
std::string charset;
std::string image_data;
bool success = net::DataURL::Parse(GURL(image_data_url), &mimetype, &charset,
&image_data);
if (!success) {
// If getting the image data url was not successful, then request that the
// information be added to the node asynchronously (if it has not previously
// been requested), and return false.
if (!has_sent_previous_request) {
root_manager->GetImageData(*node, kMaxImageSize);
}
return false;
}
ScopedJavaLocalRef<jobject> obj = java_anib_ref_.get(env);
if (obj.is_null())
return false;
// If the image data has been retrieved from the image data url successfully,
// then convert it to a Java byte array and add it in the Bundle extras of
// the node, and return true.
Java_AccessibilityNodeInfoBuilder_setAccessibilityNodeInfoImageData(
env, obj, info, base::android::ToJavaByteArray(env, image_data));
return true;
}
BrowserAccessibilityManagerAndroid*
WebContentsAccessibilityAndroid::GetRootBrowserAccessibilityManager() {
if (snapshot_root_manager_) {
return snapshot_root_manager_.get();
}
return static_cast<BrowserAccessibilityManagerAndroid*>(
web_contents_->GetRootBrowserAccessibilityManager());
}
BrowserAccessibilityAndroid* WebContentsAccessibilityAndroid::GetAXFromUniqueID(
int32_t unique_id) {
return BrowserAccessibilityAndroid::GetFromUniqueId(unique_id);
}
void WebContentsAccessibilityAndroid::UpdateFrameInfo(float page_scale) {
page_scale_ = page_scale;
if (frame_info_initialized_)
return;
JNIEnv* env = AttachCurrentThread();
ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
if (obj.is_null())
return;
Java_WebContentsAccessibilityImpl_notifyFrameInfoInitialized(env, obj);
frame_info_initialized_ = true;
}
void WebContentsAccessibilityAndroid::RequestAccessibilityTreeSnapshot(
JNIEnv* env,
const JavaParamRef<jobject>& view_structure_root,
const JavaParamRef<jobject>& accessibility_coordinates,
const JavaParamRef<jobject>& view,
const JavaParamRef<jobject>& on_done_callback) {
// This method should only be called by the unified snapshots feature.
CHECK(base::FeatureList::IsEnabled(features::kAccessibilityUnifiedSnapshots));
// This is the callback provided by the Java-side code and will be called
// after the snapshot has been requested and fully processed. This is not to
// be confused with the ProcessCompletedAccessibilityTreeSnapshot callback
// below, which is called once the renderer has returned all AXTreeUpdates.
on_done_callback_ = std::move(on_done_callback);
accessibility_coordinates_ = accessibility_coordinates;
view_ = view;
base::android::ScopedJavaGlobalRef<jobject> movable_view_structure_root;
movable_view_structure_root.Reset(env, view_structure_root);
// Define snapshot parameters:
auto params = mojom::SnapshotAccessibilityTreeParams::New();
params->ax_mode =
ui::AXMode(ui::kAXModeComplete.flags() | ui::AXMode::kHTMLMetadata)
.flags();
params->max_nodes = 5000;
params->timeout = base::Seconds(2);
// Use AccessibilityTreeSnapshotCombiner to perform snapshots
auto combiner = base::MakeRefCounted<AccessibilityTreeSnapshotCombiner>(
base::BindOnce(&WebContentsAccessibilityAndroid::
ProcessCompletedAccessibilityTreeSnapshot,
GetWeakPtr(), env, std::move(movable_view_structure_root)),
std::move(params));
web_contents_->GetPrimaryMainFrame()->ForEachRenderFrameHost(
[&combiner](RenderFrameHostImpl* rfhi) {
combiner->RequestSnapshotOnRenderFrameHost(rfhi);
});
}
void WebContentsAccessibilityAndroid::ProcessCompletedAccessibilityTreeSnapshot(
JNIEnv* env,
const base::android::JavaRef<jobject>& view_structure_root,
ui::AXTreeUpdate& result) {
// If we don't have a connection back to the Java-side objects, then stop. It
// may be that the Java-side object was destroyed (e.g. tab closed) before the
// snapshot was able to finish.
ScopedJavaLocalRef<jobject> obj = java_adb_ref_.get(env);
if (!obj) {
on_done_callback_ = nullptr;
accessibility_coordinates_ = nullptr;
view_ = nullptr;
return;
}
// Construct a root manager without a delegate using the snapshot result.
snapshot_root_manager_ = std::make_unique<BrowserAccessibilityManagerAndroid>(
result, GetWeakPtr(), *this, /* delegate= */ nullptr);
auto* root = static_cast<BrowserAccessibilityAndroid*>(
snapshot_root_manager_->GetBrowserAccessibilityRoot());
CHECK(root);
// Construct the Java-side tree, use the JNI builder `java_adb_ref_` to
// recursively construct each node of the tree starting with the provided
// root.
RecursivelyPopulateViewStructureTree(env, obj, root, view_structure_root,
/* is_root= */ true);
// Add tree-level (root only) data to Java-side tree (e.g. HTML metadata).
const auto& metadata_strings =
GetRootBrowserAccessibilityManager()->GetMetadataForTree();
if (!metadata_strings.empty()) {
Java_AssistDataBuilder_populateHTMLMetadataProperties(
env, obj, view_structure_root,
base::android::ToJavaArrayOfStrings(env, metadata_strings));
}
// We have fulfilled the request for an accessibility tree snapshot, so we can
// now call the provided Java-side callback to inform original client that the
// async construction is complete.
base::android::RunRunnableAndroid(on_done_callback_);
}
void WebContentsAccessibilityAndroid::RecursivelyPopulateViewStructureTree(
JNIEnv* env,
ScopedJavaLocalRef<jobject> obj,
const BrowserAccessibilityAndroid* node,
const base::android::JavaRef<jobject>& java_side_assist_data_object,
bool is_root) {
PopulateViewStructureNode(env, obj, node, java_side_assist_data_object);
for (size_t child_index = 0; const auto& child : node->PlatformChildren()) {
const auto& child_node =
static_cast<const BrowserAccessibilityAndroid&>(child);
ScopedJavaLocalRef<jobject> java_side_child_object =
Java_AssistDataBuilder_addChildNode(
env, obj, java_side_assist_data_object, child_index);
child_index++;
RecursivelyPopulateViewStructureTree(env, obj, &child_node,
java_side_child_object,
/* is_root= */ false);
}
if (!is_root) {
Java_AssistDataBuilder_commitNode(env, obj, java_side_assist_data_object);
}
}
void WebContentsAccessibilityAndroid::PopulateViewStructureNode(
JNIEnv* env,
ScopedJavaLocalRef<jobject> obj,
const BrowserAccessibilityAndroid* node,
const base::android::JavaRef<jobject>& java_side_assist_data_object) {
Java_AssistDataBuilder_populateBaseProperties(
env, obj, java_side_assist_data_object,
GetCanonicalJNIString(env, node->GetClassName()), node->GetChildCount());
int bgcolor = 0;
int color = 0;
int text_size = -1.0;
if (node->HasFloatAttribute(ax::mojom::FloatAttribute::kFontSize)) {
color = node->GetIntAttribute(ax::mojom::IntAttribute::kColor);
bgcolor = node->GetIntAttribute(ax::mojom::IntAttribute::kBackgroundColor);
text_size = node->GetFloatAttribute(ax::mojom::FloatAttribute::kFontSize);
}
Java_AssistDataBuilder_populateTextProperties(
env, obj, java_side_assist_data_object,
base::android::ConvertUTF16ToJavaString(env, node->GetTextContentUTF16()),
node->GetSelectedItemCount() > 0, node->GetSelectionStart(),
node->GetSelectionEnd(), color, bgcolor, text_size,
node->HasTextStyle(ax::mojom::TextStyle::kBold),
node->HasTextStyle(ax::mojom::TextStyle::kItalic),
node->HasTextStyle(ax::mojom::TextStyle::kUnderline),
node->HasTextStyle(ax::mojom::TextStyle::kLineThrough));
float dip_scale =
1 /
web_contents_->GetPrimaryMainFrame()->AccessibilityGetDeviceScaleFactor();
gfx::Rect absolute_rect = gfx::ScaleToEnclosingRect(
node->GetUnclippedRootFrameBoundsRect(), dip_scale, dip_scale);
Java_AssistDataBuilder_populateBoundsProperties(
env, obj, java_side_assist_data_object, absolute_rect.x(),
absolute_rect.y(), absolute_rect.width(), absolute_rect.height(),
accessibility_coordinates_, view_);
std::vector<std::vector<std::u16string>> html_attrs;
for (const auto& attr : node->GetHtmlAttributes()) {
html_attrs.push_back(
{base::UTF8ToUTF16(attr.first), base::UTF8ToUTF16(attr.second)});
}
Java_AssistDataBuilder_populateHTMLProperties(
env, obj, java_side_assist_data_object,
GetCanonicalJNIString(
env, node->GetStringAttribute(ax::mojom::StringAttribute::kHtmlTag)),
GetCanonicalJNIString(
env, node->GetStringAttribute(ax::mojom::StringAttribute::kDisplay)),
base::android::ToJavaArrayOfStringArray(env, html_attrs));
}
base::WeakPtr<WebContentsAccessibilityAndroid>
WebContentsAccessibilityAndroid::GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
}
jlong JNI_WebContentsAccessibilityImpl_InitWithAXTree(
JNIEnv* env,
const JavaParamRef<jobject>& obj,
jlong ax_tree_update_ptr,
const JavaParamRef<jobject>& jaccessibility_node_info_builder) {
return reinterpret_cast<intptr_t>(new WebContentsAccessibilityAndroid(
env, obj, ax_tree_update_ptr, jaccessibility_node_info_builder));
}
jlong JNI_WebContentsAccessibilityImpl_Init(
JNIEnv* env,
const JavaParamRef<jobject>& obj,
const JavaParamRef<jobject>& jweb_contents,
const JavaParamRef<jobject>& jaccessibility_node_info_builder) {
WebContents* web_contents = WebContents::FromJavaWebContents(jweb_contents);
DCHECK(web_contents);
return reinterpret_cast<intptr_t>(new WebContentsAccessibilityAndroid(
env, obj, web_contents, jaccessibility_node_info_builder));
}
jlong JNI_WebContentsAccessibilityImpl_InitForAssistData(
JNIEnv* env,
const JavaParamRef<jobject>& obj,
const JavaParamRef<jobject>& jweb_contents,
const JavaParamRef<jobject>& jassist_data_builder) {
WebContents* web_contents = WebContents::FromJavaWebContents(jweb_contents);
DCHECK(web_contents);
return reinterpret_cast<intptr_t>(new WebContentsAccessibilityAndroid(
env, obj, jassist_data_builder, web_contents));
}
void JNI_WebContentsAccessibilityImpl_SetBrowserAXMode(
JNIEnv* env,
const JavaParamRef<jobject>& obj,
jboolean is_screen_reader_enabled,
jboolean form_controls_mode,
jboolean is_any_accessibility_tool_present) {
BrowserAccessibilityStateImpl* accessibility_state =
BrowserAccessibilityStateImpl::GetInstance();
// The AXMode flags will be set according to requirements of the current
// system based on running services. This can be disabled with an enterprise
// policy, in which case accessibility becomes an all-or-none approach.
if (!accessibility_state->IsPerformanceFilteringAllowed()) {
// When the browser is not yet accessible, then set the AXMode to
// |ui::kAXModeComplete| for all web contents.
if (!accessibility_state->IsAccessibleBrowser()) {
accessibility_state->OnScreenReaderDetected();
}
return;
}
// Set the AXMode based on currently running services, sent from Java-side
// code and will fit into one of the below categories:
//
// 1. Screenreader running - |ui::kAXModeComplete|
// 2. Only password manager running - |ui::kAXModeFormControls|
// 3. Some accessibility services running that need more information than a
// password manager, but not as much as a screenreader -
// |ui::kAXModeBasic|
//
if (is_screen_reader_enabled) {
// Remove form controls experimental mode to preserve screen reader mode.
ui::AXMode flags_to_remove(ui::AXMode::kNone,
ui::AXMode::kExperimentalFormControls);
accessibility_state->RemoveAccessibilityModeFlags(flags_to_remove);
accessibility_state->AddAccessibilityModeFlags(ui::kAXModeComplete);
} else if (form_controls_mode) {
// TODO (aldietz): Add a SetAccessibilityModeFlags method to
// BrowserAccessibilityState to add and remove flags atomically in one
// operation.
// Remove the mode flags present in kAXModeComplete but not in
// kAXModeFormControls, thereby reverting the mode to kAXModeFormControls
// while not touching any other flags.
ui::AXMode flags_to_remove(ui::kAXModeComplete.flags() &
~ui::kAXModeFormControls.flags());
accessibility_state->RemoveAccessibilityModeFlags(flags_to_remove);
// Add form controls experimental mode.
accessibility_state->AddAccessibilityModeFlags(ui::kAXModeFormControls);
} else {
// Remove the mode flags present in kAXModeComplete and
// kExperimentalFormControls but not in kAXModeBasic, thereby reverting
// the mode to kAXModeBasic while not touching any other flags.
ui::AXMode flags_to_remove(
ui::kAXModeComplete.flags() & ~ui::kAXModeBasic.flags(),
ui::AXMode::kExperimentalFormControls);
accessibility_state->RemoveAccessibilityModeFlags(flags_to_remove);
// Add basic mode
accessibility_state->AddAccessibilityModeFlags(ui::kAXModeBasic);
}
}
} // namespace content
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