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fune/accessible/android/AccessibleWrap.cpp
Eitan Isaacson f9fbfefda3 Bug 1801986 - Set pivot root to top remote document. r=Jamie 
The pivot should never cross from remote into parent process local
containers. We need to explicitly set the root for the pivot, and
assert for this in the pivot traversal methods.

Differential Revision: https://phabricator.services.mozilla.com/D163285
2022-11-29 20:31:21 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "AccessibleWrap.h"
#include "JavaBuiltins.h"
#include "LocalAccessible-inl.h"
#include "HyperTextAccessible-inl.h"
#include "AccAttributes.h"
#include "AccEvent.h"
#include "AndroidInputType.h"
#include "DocAccessibleWrap.h"
#include "SessionAccessibility.h"
#include "TextLeafAccessible.h"
#include "TraversalRule.h"
#include "Pivot.h"
#include "Platform.h"
#include "nsAccessibilityService.h"
#include "nsEventShell.h"
#include "nsIAccessibleAnnouncementEvent.h"
#include "nsAccUtils.h"
#include "nsTextEquivUtils.h"
#include "nsWhitespaceTokenizer.h"
#include "RootAccessible.h"
#include "mozilla/a11y/PDocAccessibleChild.h"
#include "mozilla/jni/GeckoBundleUtils.h"
#include "mozilla/StaticPrefs_accessibility.h"
#include "mozilla/a11y/DocAccessibleParent.h"
// icu TRUE conflicting with java::sdk::Boolean::TRUE()
// https://searchfox.org/mozilla-central/rev/ce02064d8afc8673cef83c92896ee873bd35e7ae/intl/icu/source/common/unicode/umachine.h#265
// https://searchfox.org/mozilla-central/source/__GENERATED__/widget/android/bindings/JavaBuiltins.h#78
#ifdef TRUE
# undef TRUE
#endif
using namespace mozilla::a11y;
//-----------------------------------------------------
// construction
//-----------------------------------------------------
AccessibleWrap::AccessibleWrap(nsIContent* aContent, DocAccessible* aDoc)
: LocalAccessible(aContent, aDoc), mID(SessionAccessibility::kUnsetID) {
if (!IPCAccessibilityActive()) {
MonitorAutoLock mal(nsAccessibilityService::GetAndroidMonitor());
SessionAccessibility::RegisterAccessible(this);
}
}
//-----------------------------------------------------
// destruction
//-----------------------------------------------------
AccessibleWrap::~AccessibleWrap() {}
nsresult AccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
auto accessible = static_cast<AccessibleWrap*>(aEvent->GetAccessible());
NS_ENSURE_TRUE(accessible, NS_ERROR_FAILURE);
DocAccessibleWrap* doc =
static_cast<DocAccessibleWrap*>(accessible->Document());
if (doc) {
switch (aEvent->GetEventType()) {
case nsIAccessibleEvent::EVENT_FOCUS: {
if (DocAccessibleWrap* topContentDoc =
doc->GetTopLevelContentDoc(accessible)) {
topContentDoc->CacheFocusPath(accessible);
}
break;
}
case nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED: {
AccVCChangeEvent* vcEvent = downcast_accEvent(aEvent);
auto newPosition =
static_cast<AccessibleWrap*>(vcEvent->NewAccessible());
if (newPosition) {
if (DocAccessibleWrap* topContentDoc =
doc->GetTopLevelContentDoc(accessible)) {
topContentDoc->CacheFocusPath(newPosition);
}
}
break;
}
case nsIAccessibleEvent::EVENT_REORDER: {
if (DocAccessibleWrap* topContentDoc =
doc->GetTopLevelContentDoc(accessible)) {
topContentDoc->CacheViewport(true);
}
break;
}
case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
if (accessible != aEvent->Document() && !aEvent->IsFromUserInput()) {
AccCaretMoveEvent* caretEvent = downcast_accEvent(aEvent);
HyperTextAccessible* ht = AsHyperText();
// Pivot to the caret's position if it has an expanded selection.
// This is used mostly for find in page.
if ((ht && ht->SelectionCount())) {
DOMPoint point =
AsHyperText()->OffsetToDOMPoint(caretEvent->GetCaretOffset());
if (LocalAccessible* newPos =
doc->GetAccessibleOrContainer(point.node)) {
static_cast<AccessibleWrap*>(newPos)->PivotTo(
java::SessionAccessibility::HTML_GRANULARITY_DEFAULT, true,
true);
}
}
}
break;
}
case nsIAccessibleEvent::EVENT_SCROLLING_START: {
accessible->PivotTo(
java::SessionAccessibility::HTML_GRANULARITY_DEFAULT, true, true);
break;
}
default:
break;
}
}
nsresult rv = LocalAccessible::HandleAccEvent(aEvent);
NS_ENSURE_SUCCESS(rv, rv);
accessible->HandleLiveRegionEvent(aEvent);
if (IPCAccessibilityActive()) {
return NS_OK;
}
// The accessible can become defunct if we have an xpcom event listener
// which decides it would be fun to change the DOM and flush layout.
if (accessible->IsDefunct() || !accessible->IsBoundToParent()) {
return NS_OK;
}
if (doc) {
if (!doc->DocumentNode()->IsContentDocument()) {
return NS_OK;
}
}
RefPtr<SessionAccessibility> sessionAcc =
SessionAccessibility::GetInstanceFor(accessible);
if (!sessionAcc) {
return NS_OK;
}
switch (aEvent->GetEventType()) {
case nsIAccessibleEvent::EVENT_FOCUS:
sessionAcc->SendFocusEvent(accessible);
break;
case nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED: {
AccVCChangeEvent* vcEvent = downcast_accEvent(aEvent);
if (!vcEvent->IsFromUserInput()) {
break;
}
RefPtr<AccessibleWrap> newPosition =
static_cast<AccessibleWrap*>(vcEvent->NewAccessible());
if (sessionAcc && newPosition) {
if (vcEvent->Reason() == nsIAccessiblePivot::REASON_POINT) {
sessionAcc->SendHoverEnterEvent(newPosition);
} else if (vcEvent->BoundaryType() == nsIAccessiblePivot::NO_BOUNDARY) {
sessionAcc->SendAccessibilityFocusedEvent(newPosition);
}
if (vcEvent->BoundaryType() != nsIAccessiblePivot::NO_BOUNDARY) {
sessionAcc->SendTextTraversedEvent(
newPosition, vcEvent->NewStartOffset(), vcEvent->NewEndOffset());
}
}
break;
}
case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
AccCaretMoveEvent* event = downcast_accEvent(aEvent);
sessionAcc->SendTextSelectionChangedEvent(accessible,
event->GetCaretOffset());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
AccTextChangeEvent* event = downcast_accEvent(aEvent);
sessionAcc->SendTextChangedEvent(
accessible, event->ModifiedText(), event->GetStartOffset(),
event->GetLength(), event->IsTextInserted(),
event->IsFromUserInput());
break;
}
case nsIAccessibleEvent::EVENT_STATE_CHANGE: {
AccStateChangeEvent* event = downcast_accEvent(aEvent);
auto state = event->GetState();
if (state & states::CHECKED) {
sessionAcc->SendClickedEvent(
accessible, java::SessionAccessibility::FLAG_CHECKABLE |
(event->IsStateEnabled()
? java::SessionAccessibility::FLAG_CHECKED
: 0));
}
if (state & states::EXPANDED) {
sessionAcc->SendClickedEvent(
accessible, java::SessionAccessibility::FLAG_EXPANDABLE |
(event->IsStateEnabled()
? java::SessionAccessibility::FLAG_EXPANDED
: 0));
}
if (state & states::SELECTED) {
sessionAcc->SendSelectedEvent(accessible, event->IsStateEnabled());
}
if (state & states::BUSY) {
sessionAcc->SendWindowStateChangedEvent(accessible);
}
break;
}
case nsIAccessibleEvent::EVENT_SCROLLING: {
AccScrollingEvent* event = downcast_accEvent(aEvent);
sessionAcc->SendScrollingEvent(accessible, event->ScrollX(),
event->ScrollY(), event->MaxScrollX(),
event->MaxScrollY());
break;
}
case nsIAccessibleEvent::EVENT_ANNOUNCEMENT: {
AccAnnouncementEvent* event = downcast_accEvent(aEvent);
sessionAcc->SendAnnouncementEvent(accessible, event->Announcement(),
event->Priority());
break;
}
case nsIAccessibleEvent::EVENT_REORDER: {
if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
sessionAcc->SendWindowContentChangedEvent();
}
break;
}
default:
break;
}
return NS_OK;
}
void AccessibleWrap::Shutdown() {
if (!IPCAccessibilityActive()) {
MonitorAutoLock mal(nsAccessibilityService::GetAndroidMonitor());
SessionAccessibility::UnregisterAccessible(this);
}
LocalAccessible::Shutdown();
}
bool AccessibleWrap::DoAction(uint8_t aIndex) const {
if (ActionCount()) {
return LocalAccessible::DoAction(aIndex);
}
if (mContent) {
// We still simulate a click on an accessible even if there is no
// known actions. For the sake of bad markup.
DoCommand();
return true;
}
return false;
}
Accessible* AccessibleWrap::DoPivot(Accessible* aAccessible,
int32_t aGranularity, bool aForward,
bool aInclusive) {
Accessible* pivotRoot = nullptr;
if (aAccessible->IsRemote()) {
// If this is a remote accessible provide the top level
// remote doc as the pivot root for thread safety reasons.
DocAccessibleParent* doc = aAccessible->AsRemote()->Document();
while (doc && !doc->IsTopLevel()) {
doc = doc->ParentDoc();
}
MOZ_ASSERT(doc, "Failed to get top level DocAccessibleParent");
pivotRoot = doc;
}
a11y::Pivot pivot(pivotRoot);
// Depending on the start accessible, the pivot rule will either traverse
// local or remote accessibles exclusively.
TraversalRule rule(aGranularity, aAccessible->IsLocal());
Accessible* result = aForward ? pivot.Next(aAccessible, rule, aInclusive)
: pivot.Prev(aAccessible, rule, aInclusive);
if (result && (result != aAccessible || aInclusive)) {
return result;
}
return nullptr;
}
bool AccessibleWrap::PivotTo(int32_t aGranularity, bool aForward,
bool aInclusive) {
Accessible* result = DoPivot(this, aGranularity, aForward, aInclusive);
if (result) {
MOZ_ASSERT(result->IsLocal());
// Dispatch a virtual cursor change event that will be turned into an
// android accessibility focused changed event in the parent.
PivotMoveReason reason = aForward ? nsIAccessiblePivot::REASON_NEXT
: nsIAccessiblePivot::REASON_PREV;
LocalAccessible* localResult = result->AsLocal();
RefPtr<AccEvent> event = new AccVCChangeEvent(
localResult->Document(), this, -1, -1, localResult, -1, -1, reason,
nsIAccessiblePivot::NO_BOUNDARY, eFromUserInput);
nsEventShell::FireEvent(event);
return true;
}
return false;
}
void AccessibleWrap::ExploreByTouch(float aX, float aY) {
a11y::Pivot pivot(RootAccessible());
TraversalRule rule;
Accessible* maybeResult = pivot.AtPoint(aX, aY, rule);
LocalAccessible* result = maybeResult ? maybeResult->AsLocal() : nullptr;
if (result && result != this) {
RefPtr<AccEvent> event =
new AccVCChangeEvent(result->Document(), this, -1, -1, result, -1, -1,
nsIAccessiblePivot::REASON_POINT,
nsIAccessiblePivot::NO_BOUNDARY, eFromUserInput);
nsEventShell::FireEvent(event);
}
}
void AccessibleWrap::NavigateText(int32_t aGranularity, int32_t aStartOffset,
int32_t aEndOffset, bool aForward,
bool aSelect) {
a11y::Pivot pivot(RootAccessible());
HyperTextAccessible* editable =
(State() & states::EDITABLE) != 0 ? AsHyperText() : nullptr;
int32_t start = aStartOffset, end = aEndOffset;
// If the accessible is an editable, set the virtual cursor position
// to its caret offset. Otherwise use the document's virtual cursor
// position as a starting offset.
if (editable) {
start = end = editable->CaretOffset();
}
uint16_t pivotGranularity = nsIAccessiblePivot::LINE_BOUNDARY;
switch (aGranularity) {
case 1: // MOVEMENT_GRANULARITY_CHARACTER
pivotGranularity = nsIAccessiblePivot::CHAR_BOUNDARY;
break;
case 2: // MOVEMENT_GRANULARITY_WORD
pivotGranularity = nsIAccessiblePivot::WORD_BOUNDARY;
break;
default:
break;
}
int32_t newOffset;
Accessible* newAnchorBase = nullptr;
if (aForward) {
newAnchorBase = pivot.NextText(this, &start, &end, pivotGranularity);
newOffset = end;
} else {
newAnchorBase = pivot.PrevText(this, &start, &end, pivotGranularity);
newOffset = start;
}
LocalAccessible* newAnchor =
newAnchorBase ? newAnchorBase->AsLocal() : nullptr;
if (newAnchor && (start != aStartOffset || end != aEndOffset)) {
if (IsTextLeaf() && newAnchor == LocalParent()) {
// For paragraphs, divs, spans, etc., we put a11y focus on the text leaf
// node instead of the HyperTextAccessible. However, Pivot will always
// return a HyperTextAccessible. Android doesn't support text navigation
// landing on an accessible which is different to the originating
// accessible. Therefore, if we're still within the same text leaf,
// translate the offsets to the text leaf.
int32_t thisChild = IndexInParent();
HyperTextAccessible* newHyper = newAnchor->AsHyperText();
MOZ_ASSERT(newHyper);
int32_t startChild = newHyper->GetChildIndexAtOffset(start);
// We use end - 1 because the end offset is exclusive, so end itself
// might be associated with the next child.
int32_t endChild = newHyper->GetChildIndexAtOffset(end - 1);
if (startChild == thisChild && endChild == thisChild) {
// We've landed within the same text leaf.
newAnchor = this;
int32_t thisOffset = newHyper->GetChildOffset(thisChild);
start -= thisOffset;
end -= thisOffset;
}
}
RefPtr<AccEvent> event = new AccVCChangeEvent(
newAnchor->Document(), this, aStartOffset, aEndOffset, newAnchor, start,
end, nsIAccessiblePivot::REASON_NONE, pivotGranularity, eFromUserInput);
nsEventShell::FireEvent(event);
}
// If we are in an editable, move the caret to the new virtual cursor
// offset.
if (editable) {
if (aSelect) {
int32_t anchor = editable->CaretOffset();
if (editable->SelectionCount()) {
int32_t startSel, endSel;
GetSelectionOrCaret(&startSel, &endSel);
anchor = startSel == anchor ? endSel : startSel;
}
editable->SetSelectionBoundsAt(0, anchor, newOffset);
} else {
editable->SetCaretOffset(newOffset);
}
}
}
void AccessibleWrap::SetSelection(int32_t aStart, int32_t aEnd) {
if (HyperTextAccessible* textAcc = AsHyperText()) {
if (aStart == aEnd) {
textAcc->SetCaretOffset(aStart);
} else {
textAcc->SetSelectionBoundsAt(0, aStart, aEnd);
}
}
}
void AccessibleWrap::Cut() {
if ((State() & states::EDITABLE) == 0) {
return;
}
if (HyperTextAccessible* textAcc = AsHyperText()) {
int32_t startSel, endSel;
GetSelectionOrCaret(&startSel, &endSel);
textAcc->CutText(startSel, endSel);
}
}
void AccessibleWrap::Copy() {
if (HyperTextAccessible* textAcc = AsHyperText()) {
int32_t startSel, endSel;
GetSelectionOrCaret(&startSel, &endSel);
textAcc->CopyText(startSel, endSel);
}
}
void AccessibleWrap::Paste() {
if ((State() & states::EDITABLE) == 0) {
return;
}
if (IsHyperText()) {
RefPtr<HyperTextAccessible> textAcc = AsHyperText();
int32_t startSel, endSel;
GetSelectionOrCaret(&startSel, &endSel);
if (startSel != endSel) {
textAcc->DeleteText(startSel, endSel);
}
textAcc->PasteText(startSel);
}
}
void AccessibleWrap::GetSelectionOrCaret(int32_t* aStartOffset,
int32_t* aEndOffset) {
*aStartOffset = *aEndOffset = -1;
if (HyperTextAccessible* textAcc = AsHyperText()) {
if (!textAcc->SelectionBoundsAt(0, aStartOffset, aEndOffset)) {
*aStartOffset = *aEndOffset = textAcc->CaretOffset();
}
}
}
uint32_t AccessibleWrap::GetFlags(role aRole, uint64_t aState,
uint8_t aActionCount) {
uint32_t flags = 0;
if (aState & states::CHECKABLE) {
flags |= java::SessionAccessibility::FLAG_CHECKABLE;
}
if (aState & states::CHECKED) {
flags |= java::SessionAccessibility::FLAG_CHECKED;
}
if (aState & states::INVALID) {
flags |= java::SessionAccessibility::FLAG_CONTENT_INVALID;
}
if (aState & states::EDITABLE) {
flags |= java::SessionAccessibility::FLAG_EDITABLE;
}
if (aActionCount && aRole != roles::TEXT_LEAF) {
flags |= java::SessionAccessibility::FLAG_CLICKABLE;
}
if (aState & states::ENABLED) {
flags |= java::SessionAccessibility::FLAG_ENABLED;
}
if (aState & states::FOCUSABLE) {
flags |= java::SessionAccessibility::FLAG_FOCUSABLE;
}
if (aState & states::FOCUSED) {
flags |= java::SessionAccessibility::FLAG_FOCUSED;
}
if (aState & states::MULTI_LINE) {
flags |= java::SessionAccessibility::FLAG_MULTI_LINE;
}
if (aState & states::SELECTABLE) {
flags |= java::SessionAccessibility::FLAG_SELECTABLE;
}
if (aState & states::SELECTED) {
flags |= java::SessionAccessibility::FLAG_SELECTED;
}
if (aState & states::EXPANDABLE) {
flags |= java::SessionAccessibility::FLAG_EXPANDABLE;
}
if (aState & states::EXPANDED) {
flags |= java::SessionAccessibility::FLAG_EXPANDED;
}
if ((aState & (states::INVISIBLE | states::OFFSCREEN)) == 0) {
flags |= java::SessionAccessibility::FLAG_VISIBLE_TO_USER;
}
if (aRole == roles::PASSWORD_TEXT) {
flags |= java::SessionAccessibility::FLAG_PASSWORD;
}
return flags;
}
void AccessibleWrap::GetRoleDescription(role aRole, AccAttributes* aAttributes,
nsAString& aGeckoRole,
nsAString& aRoleDescription) {
if (aRole == roles::HEADING && aAttributes) {
// The heading level is an attribute, so we need that.
nsAutoString headingLevel;
if (aAttributes->GetAttribute(nsGkAtoms::level, headingLevel)) {
nsAutoString token(u"heading-");
token.Append(headingLevel);
if (LocalizeString(token, aRoleDescription)) {
return;
}
}
}
if ((aRole == roles::LANDMARK || aRole == roles::REGION) && aAttributes) {
nsAutoString xmlRoles;
if (aAttributes->GetAttribute(nsGkAtoms::xmlroles, xmlRoles)) {
nsWhitespaceTokenizer tokenizer(xmlRoles);
while (tokenizer.hasMoreTokens()) {
if (LocalizeString(tokenizer.nextToken(), aRoleDescription)) {
return;
}
}
}
}
GetAccService()->GetStringRole(aRole, aGeckoRole);
LocalizeString(aGeckoRole, aRoleDescription);
}
int32_t AccessibleWrap::AndroidClass(Accessible* aAccessible) {
return GetVirtualViewID(aAccessible) == SessionAccessibility::kNoID
? java::SessionAccessibility::CLASSNAME_WEBVIEW
: GetAndroidClass(aAccessible->Role());
}
int32_t AccessibleWrap::GetVirtualViewID(Accessible* aAccessible) {
if (aAccessible->IsLocal()) {
return static_cast<AccessibleWrap*>(aAccessible)->mID;
}
return static_cast<int32_t>(aAccessible->AsRemote()->GetWrapper());
}
void AccessibleWrap::SetVirtualViewID(Accessible* aAccessible,
int32_t aVirtualViewID) {
if (aAccessible->IsLocal()) {
static_cast<AccessibleWrap*>(aAccessible)->mID = aVirtualViewID;
} else {
aAccessible->AsRemote()->SetWrapper(static_cast<uintptr_t>(aVirtualViewID));
}
}
int32_t AccessibleWrap::GetAndroidClass(role aRole) {
#define ROLE(geckoRole, stringRole, atkRole, macRole, macSubrole, msaaRole, \
ia2Role, androidClass, nameRule) \
case roles::geckoRole: \
return androidClass;
switch (aRole) {
#include "RoleMap.h"
default:
return java::SessionAccessibility::CLASSNAME_VIEW;
}
#undef ROLE
}
int32_t AccessibleWrap::GetInputType(const nsString& aInputTypeAttr) {
if (aInputTypeAttr.EqualsIgnoreCase("email")) {
return java::sdk::InputType::TYPE_CLASS_TEXT |
java::sdk::InputType::TYPE_TEXT_VARIATION_WEB_EMAIL_ADDRESS;
}
if (aInputTypeAttr.EqualsIgnoreCase("number")) {
return java::sdk::InputType::TYPE_CLASS_NUMBER;
}
if (aInputTypeAttr.EqualsIgnoreCase("password")) {
return java::sdk::InputType::TYPE_CLASS_TEXT |
java::sdk::InputType::TYPE_TEXT_VARIATION_WEB_PASSWORD;
}
if (aInputTypeAttr.EqualsIgnoreCase("tel")) {
return java::sdk::InputType::TYPE_CLASS_PHONE;
}
if (aInputTypeAttr.EqualsIgnoreCase("text")) {
return java::sdk::InputType::TYPE_CLASS_TEXT |
java::sdk::InputType::TYPE_TEXT_VARIATION_WEB_EDIT_TEXT;
}
if (aInputTypeAttr.EqualsIgnoreCase("url")) {
return java::sdk::InputType::TYPE_CLASS_TEXT |
java::sdk::InputType::TYPE_TEXT_VARIATION_URI;
}
return 0;
}
void AccessibleWrap::GetTextEquiv(nsString& aText) {
if (nsTextEquivUtils::HasNameRule(this, eNameFromSubtreeIfReqRule)) {
// This is an accessible that normally doesn't get its name from its
// subtree, so we collect the text equivalent explicitly.
nsTextEquivUtils::GetTextEquivFromSubtree(this, aText);
} else {
Name(aText);
}
}
bool AccessibleWrap::HandleLiveRegionEvent(AccEvent* aEvent) {
auto eventType = aEvent->GetEventType();
if (eventType != nsIAccessibleEvent::EVENT_TEXT_INSERTED &&
eventType != nsIAccessibleEvent::EVENT_NAME_CHANGE) {
// XXX: Right now only announce text inserted events. aria-relevant=removals
// is potentially on the chopping block[1]. We also don't support editable
// text because we currently can't descern the source of the change[2].
// 1. https://github.com/w3c/aria/issues/712
// 2. https://bugzilla.mozilla.org/show_bug.cgi?id=1531189
return false;
}
if (aEvent->IsFromUserInput()) {
return false;
}
RefPtr<AccAttributes> attributes = new AccAttributes();
nsAccUtils::SetLiveContainerAttributes(attributes, this);
nsString live;
if (!attributes->GetAttribute(nsGkAtoms::containerLive, live)) {
return false;
}
uint16_t priority = live.EqualsIgnoreCase("assertive")
? nsIAccessibleAnnouncementEvent::ASSERTIVE
: nsIAccessibleAnnouncementEvent::POLITE;
Maybe<bool> atomic =
attributes->GetAttribute<bool>(nsGkAtoms::containerAtomic);
LocalAccessible* announcementTarget = this;
nsAutoString announcement;
if (atomic && *atomic) {
LocalAccessible* atomicAncestor = nullptr;
for (LocalAccessible* parent = announcementTarget; parent;
parent = parent->LocalParent()) {
dom::Element* element = parent->Elm();
if (element &&
nsAccUtils::ARIAAttrValueIs(element, nsGkAtoms::aria_atomic,
nsGkAtoms::_true, eCaseMatters)) {
atomicAncestor = parent;
break;
}
}
if (atomicAncestor) {
announcementTarget = atomicAncestor;
static_cast<AccessibleWrap*>(atomicAncestor)->GetTextEquiv(announcement);
}
} else {
GetTextEquiv(announcement);
}
announcement.CompressWhitespace();
if (announcement.IsEmpty()) {
return false;
}
announcementTarget->Announce(announcement, priority);
return true;
}
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