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gecko-dev/accessible/generic/DocAccessible.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "Accessible-inl.h"
#include "AccIterator.h"
#include "DocAccessible-inl.h"
#include "DocAccessibleChild.h"
#include "HTMLImageMapAccessible.h"
#include "nsAccCache.h"
#include "nsAccessiblePivot.h"
#include "nsAccUtils.h"
#include "nsDeckFrame.h"
#include "nsEventShell.h"
#include "nsTextEquivUtils.h"
#include "Role.h"
#include "RootAccessible.h"
#include "TreeWalker.h"
#include "xpcAccessibleDocument.h"
#include "nsCommandManager.h"
#include "nsContentUtils.h"
#include "nsIDocShell.h"
#include "mozilla/dom/Document.h"
#include "nsPIDOMWindow.h"
#include "nsIEditingSession.h"
#include "nsIFrame.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsImageFrame.h"
#include "nsIPersistentProperties2.h"
#include "nsViewManager.h"
#include "nsIScrollableFrame.h"
#include "nsUnicharUtils.h"
#include "nsIURI.h"
#include "nsIWebNavigation.h"
#include "nsFocusManager.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/EventStates.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/PresShell.h"
#include "mozilla/TextEditor.h"
#include "mozilla/dom/AncestorIterator.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/dom/DocumentType.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/MutationEventBinding.h"
#include "mozilla/dom/UserActivation.h"
#include "HTMLElementAccessibles.h"
using namespace mozilla;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// Static member initialization
static nsStaticAtom* const kRelationAttrs[] = {nsGkAtoms::aria_labelledby,
nsGkAtoms::aria_describedby,
nsGkAtoms::aria_details,
nsGkAtoms::aria_owns,
nsGkAtoms::aria_controls,
nsGkAtoms::aria_flowto,
nsGkAtoms::aria_errormessage,
nsGkAtoms::_for,
nsGkAtoms::control};
static const uint32_t kRelationAttrsLen = ArrayLength(kRelationAttrs);
////////////////////////////////////////////////////////////////////////////////
// Constructor/desctructor
DocAccessible::DocAccessible(dom::Document* aDocument,
PresShell* aPresShell)
: // XXX don't pass a document to the Accessible constructor so that we
// don't set mDoc until our vtable is fully setup. If we set mDoc before
// setting up the vtable we will call Accessible::AddRef() but not the
// overrides of it for subclasses. It is important to call those
// overrides to avoid confusing leak checking machinary.
HyperTextAccessibleWrap(nullptr, nullptr),
// XXX aaronl should we use an algorithm for the initial cache size?
mAccessibleCache(kDefaultCacheLength),
mNodeToAccessibleMap(kDefaultCacheLength),
mDocumentNode(aDocument),
mLoadState(eTreeConstructionPending),
mDocFlags(0),
mLoadEventType(0),
mARIAAttrOldValue{nullptr},
mVirtualCursor(nullptr),
mPresShell(aPresShell),
mIPCDoc(nullptr) {
mGenericTypes |= eDocument;
mStateFlags |= eNotNodeMapEntry;
mDoc = this;
MOZ_ASSERT(mPresShell, "should have been given a pres shell");
mPresShell->SetDocAccessible(this);
}
DocAccessible::~DocAccessible() {
NS_ASSERTION(!mPresShell, "LastRelease was never called!?!");
}
////////////////////////////////////////////////////////////////////////////////
// nsISupports
NS_IMPL_CYCLE_COLLECTION_CLASS(DocAccessible)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(DocAccessible, Accessible)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNotificationController)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVirtualCursor)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mChildDocuments)
for (auto hashesIter = tmp->mDependentIDsHashes.Iter(); !hashesIter.Done();
hashesIter.Next()) {
auto dependentIDsHash = hashesIter.UserData();
for (auto providersIter = dependentIDsHash->Iter(); !providersIter.Done();
providersIter.Next()) {
AttrRelProviders* providers = providersIter.UserData();
for (int32_t provIdx = providers->Length() - 1; provIdx >= 0; provIdx--) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(
cb, "content of dependent ids hash entry of document accessible");
const auto& provider = (*providers)[provIdx];
cb.NoteXPCOMChild(provider->mContent);
}
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAccessibleCache)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAnchorJumpElm)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInvalidationList)
for (auto it = tmp->mARIAOwnsHash.ConstIter(); !it.Done(); it.Next()) {
nsTArray<RefPtr<Accessible>>* ar = it.UserData();
for (uint32_t i = 0; i < ar->Length(); i++) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mARIAOwnsHash entry item");
cb.NoteXPCOMChild(ar->ElementAt(i));
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(DocAccessible, Accessible)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mNotificationController)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mVirtualCursor)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mChildDocuments)
tmp->mDependentIDsHashes.Clear();
tmp->mNodeToAccessibleMap.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mAccessibleCache)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mAnchorJumpElm)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mInvalidationList)
NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
tmp->mARIAOwnsHash.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DocAccessible)
NS_INTERFACE_MAP_ENTRY(nsIDocumentObserver)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsIAccessiblePivotObserver)
NS_INTERFACE_MAP_END_INHERITING(HyperTextAccessible)
NS_IMPL_ADDREF_INHERITED(DocAccessible, HyperTextAccessible)
NS_IMPL_RELEASE_INHERITED(DocAccessible, HyperTextAccessible)
////////////////////////////////////////////////////////////////////////////////
// nsIAccessible
ENameValueFlag DocAccessible::Name(nsString& aName) const {
aName.Truncate();
if (mParent) {
mParent->Name(aName); // Allow owning iframe to override the name
}
if (aName.IsEmpty()) {
// Allow name via aria-labelledby or title attribute
Accessible::Name(aName);
}
if (aName.IsEmpty()) {
Title(aName); // Try title element
}
if (aName.IsEmpty()) { // Last resort: use URL
URL(aName);
}
return eNameOK;
}
// Accessible public method
role DocAccessible::NativeRole() const {
nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(mDocumentNode);
if (docShell) {
nsCOMPtr<nsIDocShellTreeItem> sameTypeRoot;
docShell->GetInProcessSameTypeRootTreeItem(getter_AddRefs(sameTypeRoot));
int32_t itemType = docShell->ItemType();
if (sameTypeRoot == docShell) {
// Root of content or chrome tree
if (itemType == nsIDocShellTreeItem::typeChrome)
return roles::CHROME_WINDOW;
if (itemType == nsIDocShellTreeItem::typeContent) {
return roles::DOCUMENT;
}
} else if (itemType == nsIDocShellTreeItem::typeContent) {
return roles::DOCUMENT;
}
}
return roles::PANE; // Fall back;
}
void DocAccessible::Description(nsString& aDescription) {
if (mParent) mParent->Description(aDescription);
if (HasOwnContent() && aDescription.IsEmpty()) {
nsTextEquivUtils::GetTextEquivFromIDRefs(this, nsGkAtoms::aria_describedby,
aDescription);
}
}
// Accessible public method
uint64_t DocAccessible::NativeState() const {
// Document is always focusable.
uint64_t state =
states::FOCUSABLE; // keep in sync with NativeInteractiveState() impl
if (FocusMgr()->IsFocused(this)) state |= states::FOCUSED;
// Expose stale state until the document is ready (DOM is loaded and tree is
// constructed).
if (!HasLoadState(eReady)) state |= states::STALE;
// Expose state busy until the document and all its subdocuments is completely
// loaded.
if (!HasLoadState(eCompletelyLoaded)) state |= states::BUSY;
nsIFrame* frame = GetFrame();
if (!frame || !frame->IsVisibleConsideringAncestors(
nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY)) {
state |= states::INVISIBLE | states::OFFSCREEN;
}
RefPtr<TextEditor> textEditor = GetEditor();
state |= textEditor ? states::EDITABLE : states::READONLY;
return state;
}
uint64_t DocAccessible::NativeInteractiveState() const {
// Document is always focusable.
return states::FOCUSABLE;
}
bool DocAccessible::NativelyUnavailable() const { return false; }
// Accessible public method
void DocAccessible::ApplyARIAState(uint64_t* aState) const {
// Grab states from content element.
if (mContent) Accessible::ApplyARIAState(aState);
// Allow iframe/frame etc. to have final state override via ARIA.
if (mParent) mParent->ApplyARIAState(aState);
}
already_AddRefed<nsIPersistentProperties> DocAccessible::Attributes() {
nsCOMPtr<nsIPersistentProperties> attributes =
HyperTextAccessibleWrap::Attributes();
// No attributes if document is not attached to the tree or if it's a root
// document.
if (!mParent || IsRoot()) return attributes.forget();
// Override ARIA object attributes from outerdoc.
aria::AttrIterator attribIter(mParent->GetContent());
nsAutoString name, value, unused;
while (attribIter.Next(name, value))
attributes->SetStringProperty(NS_ConvertUTF16toUTF8(name), value, unused);
return attributes.forget();
}
Accessible* DocAccessible::FocusedChild() {
// Return an accessible for the current global focus, which does not have to
// be contained within the current document.
return FocusMgr()->FocusedAccessible();
}
void DocAccessible::TakeFocus() const {
// Focus the document.
nsFocusManager* fm = nsFocusManager::GetFocusManager();
RefPtr<dom::Element> newFocus;
dom::AutoHandlingUserInputStatePusher inputStatePusher(true);
fm->MoveFocus(mDocumentNode->GetWindow(), nullptr,
nsFocusManager::MOVEFOCUS_ROOT, 0, getter_AddRefs(newFocus));
}
// HyperTextAccessible method
already_AddRefed<TextEditor> DocAccessible::GetEditor() const {
// Check if document is editable (designMode="on" case). Otherwise check if
// the html:body (for HTML document case) or document element is editable.
if (!mDocumentNode->HasFlag(NODE_IS_EDITABLE) &&
(!mContent || !mContent->HasFlag(NODE_IS_EDITABLE)))
return nullptr;
nsCOMPtr<nsIDocShell> docShell = mDocumentNode->GetDocShell();
if (!docShell) {
return nullptr;
}
nsCOMPtr<nsIEditingSession> editingSession;
docShell->GetEditingSession(getter_AddRefs(editingSession));
if (!editingSession) return nullptr; // No editing session interface
RefPtr<HTMLEditor> htmlEditor =
editingSession->GetHTMLEditorForWindow(mDocumentNode->GetWindow());
if (!htmlEditor) {
return nullptr;
}
bool isEditable = false;
htmlEditor->GetIsDocumentEditable(&isEditable);
if (isEditable) {
return htmlEditor.forget();
}
return nullptr;
}
// DocAccessible public method
void DocAccessible::URL(nsAString& aURL) const {
nsCOMPtr<nsISupports> container = mDocumentNode->GetContainer();
nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(container));
nsAutoCString theURL;
if (webNav) {
nsCOMPtr<nsIURI> pURI;
webNav->GetCurrentURI(getter_AddRefs(pURI));
if (pURI) pURI->GetSpec(theURL);
}
CopyUTF8toUTF16(theURL, aURL);
}
void DocAccessible::DocType(nsAString& aType) const {
dom::DocumentType* docType = mDocumentNode->GetDoctype();
if (docType) docType->GetPublicId(aType);
}
////////////////////////////////////////////////////////////////////////////////
// Accessible
void DocAccessible::Init() {
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocCreate))
logging::DocCreate("document initialize", mDocumentNode, this);
#endif
// Initialize notification controller.
mNotificationController = new NotificationController(this, mPresShell);
// Mark the document accessible as loaded if its DOM document was loaded at
// this point (this can happen because a11y is started late or DOM document
// having no container was loaded.
if (mDocumentNode->GetReadyStateEnum() == dom::Document::READYSTATE_COMPLETE)
mLoadState |= eDOMLoaded;
AddEventListeners();
}
void DocAccessible::Shutdown() {
if (!mPresShell) { // already shutdown
return;
}
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocDestroy))
logging::DocDestroy("document shutdown", mDocumentNode, this);
#endif
// Mark the document as shutdown before AT is notified about the document
// removal from its container (valid for root documents on ATK and due to
// some reason for MSAA, refer to bug 757392 for details).
mStateFlags |= eIsDefunct;
if (mNotificationController) {
mNotificationController->Shutdown();
mNotificationController = nullptr;
}
RemoveEventListeners();
if (mParent) {
DocAccessible* parentDocument = mParent->Document();
if (parentDocument) parentDocument->RemoveChildDocument(this);
mParent->RemoveChild(this);
MOZ_ASSERT(!mParent, "Parent has to be null!");
}
// Walk the array backwards because child documents remove themselves from the
// array as they are shutdown.
int32_t childDocCount = mChildDocuments.Length();
for (int32_t idx = childDocCount - 1; idx >= 0; idx--)
mChildDocuments[idx]->Shutdown();
mChildDocuments.Clear();
// XXX thinking about ordering?
if (mIPCDoc) {
MOZ_ASSERT(IPCAccessibilityActive());
mIPCDoc->Shutdown();
MOZ_ASSERT(!mIPCDoc);
}
if (mVirtualCursor) {
mVirtualCursor->RemoveObserver(this);
mVirtualCursor = nullptr;
}
mPresShell->SetDocAccessible(nullptr);
mPresShell = nullptr; // Avoid reentrancy
mDependentIDsHashes.Clear();
mNodeToAccessibleMap.Clear();
mAnchorJumpElm = nullptr;
mInvalidationList.Clear();
for (auto iter = mAccessibleCache.Iter(); !iter.Done(); iter.Next()) {
Accessible* accessible = iter.Data();
MOZ_ASSERT(accessible);
if (accessible && !accessible->IsDefunct()) {
// Unlink parent to avoid its cleaning overhead in shutdown.
accessible->mParent = nullptr;
accessible->Shutdown();
}
iter.Remove();
}
HyperTextAccessibleWrap::Shutdown();
GetAccService()->NotifyOfDocumentShutdown(this, mDocumentNode);
mDocumentNode = nullptr;
}
nsIFrame* DocAccessible::GetFrame() const {
nsIFrame* root = nullptr;
if (mPresShell) {
root = mPresShell->GetRootFrame();
}
return root;
}
// DocAccessible protected member
nsRect DocAccessible::RelativeBounds(nsIFrame** aRelativeFrame) const {
*aRelativeFrame = GetFrame();
dom::Document* document = mDocumentNode;
dom::Document* parentDoc = nullptr;
nsRect bounds;
while (document) {
PresShell* presShell = document->GetPresShell();
if (!presShell) {
return nsRect();
}
nsRect scrollPort;
nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollable();
if (sf) {
scrollPort = sf->GetScrollPortRect();
} else {
nsIFrame* rootFrame = presShell->GetRootFrame();
if (!rootFrame) return nsRect();
scrollPort = rootFrame->GetRect();
}
if (parentDoc) { // After first time thru loop
// XXXroc bogus code! scrollPort is relative to the viewport of
// this document, but we're intersecting rectangles derived from
// multiple documents and assuming they're all in the same coordinate
// system. See bug 514117.
bounds.IntersectRect(scrollPort, bounds);
} else { // First time through loop
bounds = scrollPort;
}
document = parentDoc = document->GetInProcessParentDocument();
}
return bounds;
}
// DocAccessible protected member
nsresult DocAccessible::AddEventListeners() {
nsCOMPtr<nsIDocShell> docShell(mDocumentNode->GetDocShell());
// We want to add a command observer only if the document is content and has
// an editor.
if (docShell->ItemType() == nsIDocShellTreeItem::typeContent) {
RefPtr<nsCommandManager> commandManager = docShell->GetCommandManager();
if (commandManager)
commandManager->AddCommandObserver(this, "obs_documentCreated");
}
SelectionMgr()->AddDocSelectionListener(mPresShell);
// Add document observer.
mDocumentNode->AddObserver(this);
return NS_OK;
}
// DocAccessible protected member
nsresult DocAccessible::RemoveEventListeners() {
// Remove listeners associated with content documents
NS_ASSERTION(mDocumentNode, "No document during removal of listeners.");
if (mDocumentNode) {
mDocumentNode->RemoveObserver(this);
nsCOMPtr<nsIDocShell> docShell(mDocumentNode->GetDocShell());
NS_ASSERTION(docShell, "doc should support nsIDocShellTreeItem.");
if (docShell) {
if (docShell->ItemType() == nsIDocShellTreeItem::typeContent) {
RefPtr<nsCommandManager> commandManager = docShell->GetCommandManager();
if (commandManager) {
commandManager->RemoveCommandObserver(this, "obs_documentCreated");
}
}
}
}
if (mScrollWatchTimer) {
mScrollWatchTimer->Cancel();
mScrollWatchTimer = nullptr;
NS_RELEASE_THIS(); // Kung fu death grip
}
SelectionMgr()->RemoveDocSelectionListener(mPresShell);
return NS_OK;
}
void DocAccessible::ScrollTimerCallback(nsITimer* aTimer, void* aClosure) {
DocAccessible* docAcc = reinterpret_cast<DocAccessible*>(aClosure);
if (docAcc) {
// Dispatch a scroll-end for all entries in table. They have not
// been scrolled in at least `kScrollEventInterval`.
for (auto iter = docAcc->mLastScrollingDispatch.Iter(); !iter.Done();
iter.Next()) {
docAcc->DispatchScrollingEvent(iter.Key(),
nsIAccessibleEvent::EVENT_SCROLLING_END);
iter.Remove();
}
if (docAcc->mScrollWatchTimer) {
docAcc->mScrollWatchTimer = nullptr;
NS_RELEASE(docAcc); // Release kung fu death grip
}
}
}
void DocAccessible::HandleScroll(nsINode* aTarget) {
const uint32_t kScrollEventInterval = 100;
TimeStamp now = TimeStamp::Now();
TimeStamp lastDispatch;
// If we haven't dispatched a scrolling event for a target in at least
// kScrollEventInterval milliseconds, dispatch one now.
if (!mLastScrollingDispatch.Get(aTarget, &lastDispatch) ||
(now - lastDispatch).ToMilliseconds() >= kScrollEventInterval) {
// We can't fire events on a document whose tree isn't constructed yet.
if (HasLoadState(eTreeConstructed)) {
DispatchScrollingEvent(aTarget, nsIAccessibleEvent::EVENT_SCROLLING);
}
mLastScrollingDispatch.Put(aTarget, now);
}
// If timer callback is still pending, push it 100ms into the future.
// When scrolling ends and we don't fire this callback anymore, the
// timer callback will fire and dispatch an EVENT_SCROLLING_END.
if (mScrollWatchTimer) {
mScrollWatchTimer->SetDelay(kScrollEventInterval);
} else {
NS_NewTimerWithFuncCallback(getter_AddRefs(mScrollWatchTimer),
ScrollTimerCallback, this, kScrollEventInterval,
nsITimer::TYPE_ONE_SHOT,
"a11y::DocAccessible::ScrollPositionDidChange");
if (mScrollWatchTimer) {
NS_ADDREF_THIS(); // Kung fu death grip
}
}
}
////////////////////////////////////////////////////////////////////////////////
// nsIObserver
NS_IMETHODIMP
DocAccessible::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (!nsCRT::strcmp(aTopic, "obs_documentCreated")) {
// State editable will now be set, readonly is now clear
// Normally we only fire delayed events created from the node, not an
// accessible object. See the AccStateChangeEvent constructor for details
// about this exceptional case.
RefPtr<AccEvent> event =
new AccStateChangeEvent(this, states::EDITABLE, true);
FireDelayedEvent(event);
}
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// nsIAccessiblePivotObserver
NS_IMETHODIMP
DocAccessible::OnPivotChanged(nsIAccessiblePivot* aPivot,
nsIAccessible* aOldAccessible, int32_t aOldStart,
int32_t aOldEnd, nsIAccessible* aNewAccessible,
int32_t aNewStart, int32_t aNewEnd,
PivotMoveReason aReason,
TextBoundaryType aBoundaryType,
bool aIsFromUserInput) {
RefPtr<AccEvent> event = new AccVCChangeEvent(
this, (aOldAccessible ? aOldAccessible->ToInternalAccessible() : nullptr),
aOldStart, aOldEnd,
(aNewAccessible ? aNewAccessible->ToInternalAccessible() : nullptr),
aNewStart, aNewEnd, aReason, aBoundaryType,
aIsFromUserInput ? eFromUserInput : eNoUserInput);
nsEventShell::FireEvent(event);
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// nsIDocumentObserver
NS_IMPL_NSIDOCUMENTOBSERVER_CORE_STUB(DocAccessible)
NS_IMPL_NSIDOCUMENTOBSERVER_LOAD_STUB(DocAccessible)
void DocAccessible::AttributeWillChange(dom::Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType) {
Accessible* accessible = GetAccessible(aElement);
if (!accessible) {
if (aElement != mContent) return;
accessible = this;
}
// Update dependent IDs cache. Take care of elements that are accessible
// because dependent IDs cache doesn't contain IDs from non accessible
// elements.
if (aModType != dom::MutationEvent_Binding::ADDITION)
RemoveDependentIDsFor(accessible, aAttribute);
if (aAttribute == nsGkAtoms::id) {
RelocateARIAOwnedIfNeeded(aElement);
}
// Store the ARIA attribute old value so that it can be used after
// attribute change. Note, we assume there's no nested ARIA attribute
// changes. If this happens then we should end up with keeping a stack of
// old values.
// XXX TODO: bugs 472142, 472143.
// Here we will want to cache whatever attribute values we are interested
// in, such as the existence of aria-pressed for button (so we know if we
// need to newly expose it as a toggle button) etc.
if (aAttribute == nsGkAtoms::aria_checked ||
aAttribute == nsGkAtoms::aria_pressed) {
mARIAAttrOldValue = (aModType != dom::MutationEvent_Binding::ADDITION)
? nsAccUtils::GetARIAToken(aElement, aAttribute)
: nullptr;
return;
}
if (aAttribute == nsGkAtoms::aria_disabled || aAttribute == nsGkAtoms::href ||
aAttribute == nsGkAtoms::disabled || aAttribute == nsGkAtoms::tabindex ||
aAttribute == nsGkAtoms::contenteditable) {
mPrevStateBits = accessible->State();
}
}
void DocAccessible::NativeAnonymousChildListChange(nsIContent* aContent,
bool aIsRemove) {
if (aIsRemove) {
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eTree)) {
logging::MsgBegin("TREE", "Anonymous content removed; doc: %p", this);
logging::Node("node", aContent);
logging::MsgEnd();
}
#endif
ContentRemoved(aContent);
}
}
void DocAccessible::AttributeChanged(dom::Element* aElement,
int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue) {
NS_ASSERTION(!IsDefunct(),
"Attribute changed called on defunct document accessible!");
// Proceed even if the element is not accessible because element may become
// accessible if it gets certain attribute.
if (UpdateAccessibleOnAttrChange(aElement, aAttribute)) return;
// Update the accessible tree on aria-hidden change. Make sure to not create
// a tree under aria-hidden='true'.
if (aAttribute == nsGkAtoms::aria_hidden) {
if (aria::HasDefinedARIAHidden(aElement)) {
ContentRemoved(aElement);
} else {
ContentInserted(aElement, aElement->GetNextSibling());
}
return;
}
// Ignore attribute change if the element doesn't have an accessible (at all
// or still) iff the element is not a root content of this document accessible
// (which is treated as attribute change on this document accessible).
// Note: we don't bail if all the content hasn't finished loading because
// these attributes are changing for a loaded part of the content.
Accessible* accessible = GetAccessible(aElement);
if (!accessible) {
if (mContent != aElement) return;
accessible = this;
}
MOZ_ASSERT(accessible->IsBoundToParent() || accessible->IsDoc(),
"DOM attribute change on an accessible detached from the tree");
// Fire accessible events iff there's an accessible, otherwise we consider
// the accessible state wasn't changed, i.e. its state is initial state.
AttributeChangedImpl(accessible, aNameSpaceID, aAttribute, aModType);
// Update dependent IDs cache. Take care of accessible elements because no
// accessible element means either the element is not accessible at all or
// its accessible will be created later. It doesn't make sense to keep
// dependent IDs for non accessible elements. For the second case we'll update
// dependent IDs cache when its accessible is created.
if (aModType == dom::MutationEvent_Binding::MODIFICATION ||
aModType == dom::MutationEvent_Binding::ADDITION) {
AddDependentIDsFor(accessible, aAttribute);
}
}
// DocAccessible protected member
void DocAccessible::AttributeChangedImpl(Accessible* aAccessible,
int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType) {
// Fire accessible event after short timer, because we need to wait for
// DOM attribute & resulting layout to actually change. Otherwise,
// assistive technology will retrieve the wrong state/value/selection info.
// XXX todo
// We still need to handle special HTML cases here
// For example, if an <img>'s usemap attribute is modified
// Otherwise it may just be a state change, for example an object changing
// its visibility
//
// XXX todo: report aria state changes for "undefined" literal value changes
// filed as bug 472142
//
// XXX todo: invalidate accessible when aria state changes affect exposed
// role filed as bug 472143
// Universal boolean properties that don't require a role. Fire the state
// change when disabled or aria-disabled attribute is set.
// Note. Checking the XUL or HTML namespace would not seem to gain us
// anything, because disabled attribute really is going to mean the same
// thing in any namespace.
// Note. We use the attribute instead of the disabled state bit because
// ARIA's aria-disabled does not affect the disabled state bit.
if (aAttribute == nsGkAtoms::disabled ||
aAttribute == nsGkAtoms::aria_disabled) {
// disabled can affect focusable state
aAccessible->MaybeFireFocusableStateChange(
(mPrevStateBits & states::FOCUSABLE) != 0);
// Do nothing if state wasn't changed (like @aria-disabled was removed but
// @disabled is still presented).
uint64_t unavailableState = (aAccessible->State() & states::UNAVAILABLE);
if ((mPrevStateBits & states::UNAVAILABLE) == unavailableState) {
return;
}
RefPtr<AccEvent> enabledChangeEvent = new AccStateChangeEvent(
aAccessible, states::ENABLED, !unavailableState);
FireDelayedEvent(enabledChangeEvent);
RefPtr<AccEvent> sensitiveChangeEvent = new AccStateChangeEvent(
aAccessible, states::SENSITIVE, !unavailableState);
FireDelayedEvent(sensitiveChangeEvent);
return;
}
if (aAttribute == nsGkAtoms::tabindex) {
// Fire a focusable state change event if the previous state was different.
// It may be the same if tabindex is on a redundantly focusable element.
aAccessible->MaybeFireFocusableStateChange(
(mPrevStateBits & states::FOCUSABLE));
return;
}
// When a details object has its open attribute changed
// we should fire a state-change event on the accessible of
// its main summary
if (aAttribute == nsGkAtoms::open) {
// FromDetails checks if the given accessible belongs to
// a details frame and also locates the accessible of its
// main summary.
if (HTMLSummaryAccessible* summaryAccessible =
HTMLSummaryAccessible::FromDetails(aAccessible)) {
RefPtr<AccEvent> expandedChangeEvent =
new AccStateChangeEvent(summaryAccessible, states::EXPANDED);
FireDelayedEvent(expandedChangeEvent);
return;
}
}
// Check for namespaced ARIA attribute
if (aNameSpaceID == kNameSpaceID_None) {
// Check for hyphenated aria-foo property?
if (StringBeginsWith(nsDependentAtomString(aAttribute), u"aria-"_ns)) {
ARIAAttributeChanged(aAccessible, aAttribute);
}
}
// Fire name change and description change events. XXX: it's not complete and
// dupes the code logic of accessible name and description calculation, we do
// that for performance reasons.
if (aAttribute == nsGkAtoms::aria_label) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, aAccessible);
return;
}
if (aAttribute == nsGkAtoms::aria_describedby) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE, aAccessible);
return;
}
dom::Element* elm = aAccessible->GetContent()->AsElement();
if (aAttribute == nsGkAtoms::aria_labelledby &&
!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::aria_label)) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, aAccessible);
return;
}
if (aAttribute == nsGkAtoms::alt &&
!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::aria_label) &&
!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::aria_labelledby)) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, aAccessible);
return;
}
if (aAttribute == nsGkAtoms::title) {
if (!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::aria_label) &&
!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::aria_labelledby) &&
!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::alt)) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, aAccessible);
return;
}
if (!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::aria_describedby))
FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE,
aAccessible);
return;
}
if (aAttribute == nsGkAtoms::aria_busy) {
bool isOn = elm->AttrValueIs(aNameSpaceID, aAttribute, nsGkAtoms::_true,
eCaseMatters);
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::BUSY, isOn);
FireDelayedEvent(event);
return;
}
if (aAttribute == nsGkAtoms::id) {
RelocateARIAOwnedIfNeeded(elm);
ARIAActiveDescendantIDMaybeMoved(elm);
}
// ARIA or XUL selection
if ((aAccessible->GetContent()->IsXULElement() &&
aAttribute == nsGkAtoms::selected) ||
aAttribute == nsGkAtoms::aria_selected) {
Accessible* widget =
nsAccUtils::GetSelectableContainer(aAccessible, aAccessible->State());
if (widget) {
AccSelChangeEvent::SelChangeType selChangeType =
elm->AttrValueIs(aNameSpaceID, aAttribute, nsGkAtoms::_true,
eCaseMatters)
? AccSelChangeEvent::eSelectionAdd
: AccSelChangeEvent::eSelectionRemove;
RefPtr<AccEvent> event =
new AccSelChangeEvent(widget, aAccessible, selChangeType);
FireDelayedEvent(event);
}
return;
}
if (aAttribute == nsGkAtoms::contenteditable) {
RefPtr<AccEvent> editableChangeEvent =
new AccStateChangeEvent(aAccessible, states::EDITABLE);
FireDelayedEvent(editableChangeEvent);
// Fire a focusable state change event if the previous state was different.
// It may be the same if contenteditable is set on a node that doesn't
// support it. Like an <input>.
aAccessible->MaybeFireFocusableStateChange(
(mPrevStateBits & states::FOCUSABLE));
return;
}
if (aAttribute == nsGkAtoms::value) {
if (aAccessible->IsProgress())
FireDelayedEvent(nsIAccessibleEvent::EVENT_VALUE_CHANGE, aAccessible);
return;
}
if (aModType == dom::MutationEvent_Binding::REMOVAL ||
aModType == dom::MutationEvent_Binding::ADDITION) {
if (aAttribute == nsGkAtoms::href) {
if (aAccessible->IsHTMLLink() &&
!nsCoreUtils::HasClickListener(aAccessible->GetContent())) {
RefPtr<AccEvent> linkedChangeEvent =
new AccStateChangeEvent(aAccessible, states::LINKED);
FireDelayedEvent(linkedChangeEvent);
// Fire a focusable state change event if the previous state was
// different. It may be the same if there is tabindex on this link.
aAccessible->MaybeFireFocusableStateChange(
(mPrevStateBits & states::FOCUSABLE));
}
}
}
}
// DocAccessible protected member
void DocAccessible::ARIAAttributeChanged(Accessible* aAccessible,
nsAtom* aAttribute) {
// Note: For universal/global ARIA states and properties we don't care if
// there is an ARIA role present or not.
if (aAttribute == nsGkAtoms::aria_required) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::REQUIRED);
FireDelayedEvent(event);
return;
}
if (aAttribute == nsGkAtoms::aria_invalid) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::INVALID);
FireDelayedEvent(event);
return;
}
// The activedescendant universal property redirects accessible focus events
// to the element with the id that activedescendant points to. Make sure
// the tree up to date before processing. In other words, when a node has just
// been inserted, the tree won't be up to date yet, so we must always schedule
// an async notification so that a newly inserted node will be present in
// the tree.
if (aAttribute == nsGkAtoms::aria_activedescendant) {
mNotificationController->ScheduleNotification<DocAccessible, Accessible>(
this, &DocAccessible::ARIAActiveDescendantChanged, aAccessible);
return;
}
// We treat aria-expanded as a global ARIA state for historical reasons
if (aAttribute == nsGkAtoms::aria_expanded) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::EXPANDED);
FireDelayedEvent(event);
return;
}
// For aria attributes like drag and drop changes we fire a generic attribute
// change event; at least until native API comes up with a more meaningful
// event.
uint8_t attrFlags = aria::AttrCharacteristicsFor(aAttribute);
if (!(attrFlags & ATTR_BYPASSOBJ)) {
RefPtr<AccEvent> event =
new AccObjectAttrChangedEvent(aAccessible, aAttribute);
FireDelayedEvent(event);
}
dom::Element* elm = aAccessible->GetContent()->AsElement();
if (aAttribute == nsGkAtoms::aria_checked ||
(aAccessible->IsButton() && aAttribute == nsGkAtoms::aria_pressed)) {
const uint64_t kState = (aAttribute == nsGkAtoms::aria_checked)
? states::CHECKED
: states::PRESSED;
RefPtr<AccEvent> event = new AccStateChangeEvent(aAccessible, kState);
FireDelayedEvent(event);
bool wasMixed = (mARIAAttrOldValue == nsGkAtoms::mixed);
bool isMixed = elm->AttrValueIs(kNameSpaceID_None, aAttribute,
nsGkAtoms::mixed, eCaseMatters);
if (isMixed != wasMixed) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::MIXED, isMixed);
FireDelayedEvent(event);
}
return;
}
if (aAttribute == nsGkAtoms::aria_readonly) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::READONLY);
FireDelayedEvent(event);
return;
}
// Fire text value change event whenever aria-valuetext is changed.
if (aAttribute == nsGkAtoms::aria_valuetext) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_TEXT_VALUE_CHANGE, aAccessible);
return;
}
// Fire numeric value change event when aria-valuenow is changed and
// aria-valuetext is empty
if (aAttribute == nsGkAtoms::aria_valuenow &&
(!elm->HasAttr(kNameSpaceID_None, nsGkAtoms::aria_valuetext) ||
elm->AttrValueIs(kNameSpaceID_None, nsGkAtoms::aria_valuetext,
nsGkAtoms::_empty, eCaseMatters))) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_VALUE_CHANGE, aAccessible);
return;
}
if (aAttribute == nsGkAtoms::aria_current) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::CURRENT);
FireDelayedEvent(event);
return;
}
if (aAttribute == nsGkAtoms::aria_haspopup) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(aAccessible, states::HASPOPUP);
FireDelayedEvent(event);
return;
}
if (aAttribute == nsGkAtoms::aria_owns) {
mNotificationController->ScheduleRelocation(aAccessible);
}
}
void DocAccessible::ARIAActiveDescendantChanged(Accessible* aAccessible) {
nsIContent* elm = aAccessible->GetContent();
if (elm && elm->IsElement() && aAccessible->IsActiveWidget()) {
nsAutoString id;
if (elm->AsElement()->GetAttr(kNameSpaceID_None,
nsGkAtoms::aria_activedescendant, id)) {
dom::Element* activeDescendantElm = IDRefsIterator::GetElem(elm, id);
if (activeDescendantElm) {
Accessible* activeDescendant = GetAccessible(activeDescendantElm);
if (activeDescendant) {
FocusMgr()->ActiveItemChanged(activeDescendant, false);
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eFocus))
logging::ActiveItemChangeCausedBy("ARIA activedescedant changed",
activeDescendant);
#endif
return;
}
}
}
// aria-activedescendant was cleared or changed to a non-existent node.
// Move focus back to the element itself.
FocusMgr()->ActiveItemChanged(aAccessible, false);
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eFocus)) {
logging::ActiveItemChangeCausedBy("ARIA activedescedant cleared",
aAccessible);
}
#endif
}
}
void DocAccessible::ContentAppended(nsIContent* aFirstNewContent) {}
void DocAccessible::ContentStateChanged(dom::Document* aDocument,
nsIContent* aContent,
EventStates aStateMask) {
Accessible* accessible = GetAccessible(aContent);
if (!accessible) return;
if (aStateMask.HasState(NS_EVENT_STATE_CHECKED)) {
Accessible* widget = accessible->ContainerWidget();
if (widget && widget->IsSelect()) {
AccSelChangeEvent::SelChangeType selChangeType =
aContent->AsElement()->State().HasState(NS_EVENT_STATE_CHECKED)
? AccSelChangeEvent::eSelectionAdd
: AccSelChangeEvent::eSelectionRemove;
RefPtr<AccEvent> event =
new AccSelChangeEvent(widget, accessible, selChangeType);
FireDelayedEvent(event);
return;
}
RefPtr<AccEvent> event = new AccStateChangeEvent(
accessible, states::CHECKED,
aContent->AsElement()->State().HasState(NS_EVENT_STATE_CHECKED));
FireDelayedEvent(event);
}
if (aStateMask.HasState(NS_EVENT_STATE_INVALID)) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(accessible, states::INVALID, true);
FireDelayedEvent(event);
}
if (aStateMask.HasState(NS_EVENT_STATE_REQUIRED)) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(accessible, states::REQUIRED);
FireDelayedEvent(event);
}
if (aStateMask.HasState(NS_EVENT_STATE_VISITED)) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(accessible, states::TRAVERSED, true);
FireDelayedEvent(event);
}
}
void DocAccessible::CharacterDataWillChange(nsIContent* aContent,
const CharacterDataChangeInfo&) {}
void DocAccessible::CharacterDataChanged(nsIContent* aContent,
const CharacterDataChangeInfo&) {}
void DocAccessible::ContentInserted(nsIContent* aChild) {}
void DocAccessible::ContentRemoved(nsIContent* aChildNode,
nsIContent* aPreviousSiblingNode) {
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eTree)) {
logging::MsgBegin("TREE", "DOM content removed; doc: %p", this);
logging::Node("container node", aChildNode->GetParent());
logging::Node("content node", aChildNode);
logging::MsgEnd();
}
#endif
// This one and content removal notification from layout may result in
// double processing of same subtrees. If it pops up in profiling, then
// consider reusing a document node cache to reject these notifications early.
ContentRemoved(aChildNode);
}
void DocAccessible::ParentChainChanged(nsIContent* aContent) {}
////////////////////////////////////////////////////////////////////////////////
// Accessible
#ifdef A11Y_LOG
nsresult DocAccessible::HandleAccEvent(AccEvent* aEvent) {
if (logging::IsEnabled(logging::eDocLoad))
logging::DocLoadEventHandled(aEvent);
return HyperTextAccessible::HandleAccEvent(aEvent);
}
#endif
////////////////////////////////////////////////////////////////////////////////
// Public members
void* DocAccessible::GetNativeWindow() const {
if (!mPresShell) {
return nullptr;
}
nsViewManager* vm = mPresShell->GetViewManager();
if (!vm) return nullptr;
nsCOMPtr<nsIWidget> widget;
vm->GetRootWidget(getter_AddRefs(widget));
if (widget) return widget->GetNativeData(NS_NATIVE_WINDOW);
return nullptr;
}
Accessible* DocAccessible::GetAccessibleByUniqueIDInSubtree(void* aUniqueID) {
Accessible* child = GetAccessibleByUniqueID(aUniqueID);
if (child) return child;
uint32_t childDocCount = mChildDocuments.Length();
for (uint32_t childDocIdx = 0; childDocIdx < childDocCount; childDocIdx++) {
DocAccessible* childDocument = mChildDocuments.ElementAt(childDocIdx);
child = childDocument->GetAccessibleByUniqueIDInSubtree(aUniqueID);
if (child) return child;
}
return nullptr;
}
Accessible* DocAccessible::GetAccessibleOrContainer(
nsINode* aNode, bool aNoContainerIfPruned) const {
if (!aNode || !aNode->GetComposedDoc()) {
return nullptr;
}
nsINode* start = aNode;
if (auto* shadowRoot = dom::ShadowRoot::FromNode(aNode)) {
// This can happen, for example, when called within
// SelectionManager::ProcessSelectionChanged due to focusing a direct
// child of a shadow root.
// GetFlattenedTreeParent works on children of a shadow root, but not the
// shadow root itself.
start = shadowRoot->GetHost();
if (!start) {
return nullptr;
}
}
for (nsINode* currNode : dom::InclusiveFlatTreeAncestors(*start)) {
// No container if is inside of aria-hidden subtree.
if (aNoContainerIfPruned && currNode->IsElement() &&
aria::HasDefinedARIAHidden(currNode->AsElement())) {
return nullptr;
}
// Check if node is in an unselected deck panel
if (aNoContainerIfPruned && currNode->IsXULElement()) {
if (nsIFrame* frame = currNode->AsContent()->GetPrimaryFrame()) {
nsDeckFrame* deckFrame = do_QueryFrame(frame->GetParent());
if (deckFrame && deckFrame->GetSelectedBox() != frame) {
// If deck is not a <tabpanels>, return null
nsIContent* parentFrameContent = deckFrame->GetContent();
if (!parentFrameContent ||
!parentFrameContent->IsXULElement(nsGkAtoms::tabpanels)) {
return nullptr;
}
}
}
}
// Check if node is in zero-sized map
if (aNoContainerIfPruned && currNode->IsHTMLElement(nsGkAtoms::map)) {
if (nsIFrame* frame = currNode->AsContent()->GetPrimaryFrame()) {
if (nsLayoutUtils::GetAllInFlowRectsUnion(frame, frame->GetParent())
.IsEmpty()) {
return nullptr;
}
}
}
if (Accessible* accessible = GetAccessible(currNode)) {
return accessible;
}
}
return nullptr;
}
Accessible* DocAccessible::GetAccessibleOrDescendant(nsINode* aNode) const {
Accessible* acc = GetAccessible(aNode);
if (acc) return acc;
if (aNode == mContent || aNode == mDocumentNode->GetRootElement()) {
// If the node is the doc's body or root element, return the doc accessible.
return const_cast<DocAccessible*>(this);
}
acc = GetContainerAccessible(aNode);
if (acc) {
// We access the `mChildren` array directly so that we don't access
// lazily created children in places like `XULTreeAccessible` and
// `XULTreeGridAccessible`.
uint32_t childCnt = acc->mChildren.Length();
for (uint32_t idx = 0; idx < childCnt; idx++) {
Accessible* child = acc->mChildren.ElementAt(idx);
for (nsIContent* elm = child->GetContent();
elm && elm != acc->GetContent();
elm = elm->GetFlattenedTreeParent()) {
if (elm == aNode) return child;
}
}
}
return nullptr;
}
void DocAccessible::BindToDocument(Accessible* aAccessible,
const nsRoleMapEntry* aRoleMapEntry) {
// Put into DOM node cache.
if (aAccessible->IsNodeMapEntry())
mNodeToAccessibleMap.Put(aAccessible->GetNode(), aAccessible);
// Put into unique ID cache.
mAccessibleCache.Put(aAccessible->UniqueID(), RefPtr{aAccessible});
aAccessible->SetRoleMapEntry(aRoleMapEntry);
if (aAccessible->HasOwnContent()) {
AddDependentIDsFor(aAccessible);
nsIContent* content = aAccessible->GetContent();
if (content->IsElement() && content->AsElement()->HasAttr(
kNameSpaceID_None, nsGkAtoms::aria_owns)) {
mNotificationController->ScheduleRelocation(aAccessible);
}
}
}
void DocAccessible::UnbindFromDocument(Accessible* aAccessible) {
NS_ASSERTION(mAccessibleCache.GetWeak(aAccessible->UniqueID()),
"Unbinding the unbound accessible!");
// Fire focus event on accessible having DOM focus if last focus was removed
// from the tree.
if (FocusMgr()->WasLastFocused(aAccessible)) {
FocusMgr()->ActiveItemChanged(nullptr);
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eFocus))
logging::ActiveItemChangeCausedBy("tree shutdown", aAccessible);
#endif
}
// Remove an accessible from node-to-accessible map if it exists there.
if (aAccessible->IsNodeMapEntry() &&
mNodeToAccessibleMap.Get(aAccessible->GetNode()) == aAccessible)
mNodeToAccessibleMap.Remove(aAccessible->GetNode());
aAccessible->mStateFlags |= eIsNotInDocument;
// Update XPCOM part.
xpcAccessibleDocument* xpcDoc = GetAccService()->GetCachedXPCDocument(this);
if (xpcDoc) xpcDoc->NotifyOfShutdown(aAccessible);
void* uniqueID = aAccessible->UniqueID();
NS_ASSERTION(!aAccessible->IsDefunct(), "Shutdown the shutdown accessible!");
aAccessible->Shutdown();
mAccessibleCache.Remove(uniqueID);
}
void DocAccessible::ContentInserted(nsIContent* aStartChildNode,
nsIContent* aEndChildNode) {
// Ignore content insertions until we constructed accessible tree. Otherwise
// schedule tree update on content insertion after layout.
if (!mNotificationController || !HasLoadState(eTreeConstructed)) {
return;
}
// The frame constructor guarantees that only ranges with the same parent
// arrive here in presence of dynamic changes to the page, see
// nsCSSFrameConstructor::IssueSingleInsertNotifications' callers.
nsINode* parent = aStartChildNode->GetFlattenedTreeParentNode();
if (!parent) {
return;
}
Accessible* container = AccessibleOrTrueContainer(parent);
if (!container) {
return;
}
AutoTArray<nsCOMPtr<nsIContent>, 10> list;
for (nsIContent* node = aStartChildNode; node != aEndChildNode;
node = node->GetNextSibling()) {
MOZ_ASSERT(parent == node->GetFlattenedTreeParentNode());
if (PruneOrInsertSubtree(node)) {
list.AppendElement(node);
}
}
mNotificationController->ScheduleContentInsertion(container, list);
}
bool DocAccessible::PruneOrInsertSubtree(nsIContent* aRoot) {
bool insert = false;
// In the case that we are, or are in, a shadow host, we need to assure
// some accessibles are removed if they are not rendered anymore.
nsIContent* shadowHost =
aRoot->GetShadowRoot() ? aRoot : aRoot->GetContainingShadowHost();
if (shadowHost) {
dom::ExplicitChildIterator iter(shadowHost);
// Check all explicit children in the host, if they are not slotted
// then remove their accessibles and subtrees.
while (nsIContent* childNode = iter.GetNextChild()) {
if (!childNode->GetPrimaryFrame() &&
!nsCoreUtils::IsDisplayContents(childNode)) {
ContentRemoved(childNode);
}
}
// If this is a slot, check to see if its fallback content is rendered,
// if not - remove it.
if (aRoot->IsHTMLElement(nsGkAtoms::slot)) {
for (nsIContent* childNode = aRoot->GetFirstChild(); childNode;
childNode = childNode->GetNextSibling()) {
if (!childNode->GetPrimaryFrame() &&
!nsCoreUtils::IsDisplayContents(childNode)) {
ContentRemoved(childNode);
}
}
}
}
// If we already have an accessible, check if we need to remove it, recreate
// it, or keep it in place.
Accessible* acc = GetAccessible(aRoot);
if (acc) {
MOZ_ASSERT(aRoot == acc->GetContent(), "Accessible has differing content!");
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eTree)) {
logging::MsgBegin(
"TREE", "inserted content already has accessible; doc: %p", this);
logging::Node("content node", aRoot);
logging::AccessibleInfo("accessible node", acc);
logging::MsgEnd();
}
#endif
nsIFrame* frame = acc->GetFrame();
// Accessible has no frame and it's not display:contents. Remove it.
// As well as removing the a11y subtree, we must also remove Accessibles
// for DOM descendants, since some of these might be relocated Accessibles
// and their DOM nodes are now hidden as well.
if (!frame && !nsCoreUtils::IsDisplayContents(aRoot)) {
ContentRemoved(aRoot);
return false;
}
// If it's a XULLabel it was probably reframed because a `value` attribute
// was added. The accessible creates its text leaf upon construction, so we
// need to recreate. Remove it, and schedule for reconstruction.
if (acc->IsXULLabel()) {
ContentRemoved(acc);
return true;
}
// It is a broken image that is being reframed because it either got
// or lost an `alt` tag that would rerender this node as text.
if (frame && (acc->IsImage() != (frame->AccessibleType() == eImageType))) {
ContentRemoved(aRoot);
return true;
}
// If the frame is an OuterDoc frame but this isn't an OuterDocAccessible,
// we need to recreate the Accessible. This can happen for embed or object
// elements if their embedded content changes to be web content.
if (frame && !acc->IsOuterDoc() &&
frame->AccessibleType() == eOuterDocType) {
ContentRemoved(aRoot);
return true;
}
// If the content is focused, and is being re-framed, reset the selection
// listener for the node because the previous selection listener is on the
// old frame.
if (aRoot->IsElement() && FocusMgr()->HasDOMFocus(aRoot)) {
SelectionMgr()->SetControlSelectionListener(aRoot->AsElement());
}
// The accessible can be reparented or reordered in its parent.
// We schedule it for reinsertion. For example, a slotted element
// can change its slot attribute to a different slot.
insert = true;
} else {
// If there is no current accessible, and the node has a frame, or is
// display:contents, schedule it for insertion.
if (aRoot->GetPrimaryFrame() || nsCoreUtils::IsDisplayContents(aRoot)) {
// This may be a new subtree, the insertion process will recurse through
// its descendants.
if (!GetAccessibleOrDescendant(aRoot)) {
return true;
}
// Content is not an accessible, but has accessible descendants.
// We schedule this container for insertion strictly for the case where it
// itself now needs an accessible. We will still need to recurse into the
// descendant content to prune accessibles, and in all likelyness to
// insert accessibles since accessible insertions will likeley get missed
// in an existing subtree.
insert = true;
}
}
if (Accessible* container = AccessibleOrTrueContainer(aRoot)) {
AutoTArray<nsCOMPtr<nsIContent>, 10> list;
dom::AllChildrenIterator iter =
dom::AllChildrenIterator(aRoot, nsIContent::eAllChildren, true);
while (nsIContent* childNode = iter.GetNextChild()) {
if (PruneOrInsertSubtree(childNode)) {
list.AppendElement(childNode);
}
}
if (!list.IsEmpty()) {
mNotificationController->ScheduleContentInsertion(container, list);
}
}
return insert;
}
void DocAccessible::RecreateAccessible(nsIContent* aContent) {
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eTree)) {
logging::MsgBegin("TREE", "accessible recreated");
logging::Node("content", aContent);
logging::MsgEnd();
}
#endif
// XXX: we shouldn't recreate whole accessible subtree, instead we should
// subclass hide and show events to handle them separately and implement their
// coalescence with normal hide and show events. Note, in this case they
// should be coalesced with normal show/hide events.
ContentRemoved(aContent);
ContentInserted(aContent, aContent->GetNextSibling());
}
void DocAccessible::ProcessInvalidationList() {
// Invalidate children of container accessible for each element in
// invalidation list. Allow invalidation list insertions while container
// children are recached.
for (uint32_t idx = 0; idx < mInvalidationList.Length(); idx++) {
nsIContent* content = mInvalidationList[idx];
if (!HasAccessible(content) && content->HasID()) {
Accessible* container = GetContainerAccessible(content);
if (container) {
// Check if the node is a target of aria-owns, and if so, don't process
// it here and let DoARIAOwnsRelocation process it.
AttrRelProviders* list = GetRelProviders(
content->AsElement(), nsDependentAtomString(content->GetID()));
bool shouldProcess = !!list;
if (shouldProcess) {
for (uint32_t idx = 0; idx < list->Length(); idx++) {
if (list->ElementAt(idx)->mRelAttr == nsGkAtoms::aria_owns) {
shouldProcess = false;
break;
}
}
if (shouldProcess) {
ProcessContentInserted(container, content);
}
}
}
}
}
mInvalidationList.Clear();
}
Accessible* DocAccessible::GetAccessibleEvenIfNotInMap(nsINode* aNode) const {
if (!aNode->IsContent() ||
!aNode->AsContent()->IsHTMLElement(nsGkAtoms::area))
return GetAccessible(aNode);
// XXX Bug 135040, incorrect when multiple images use the same map.
nsIFrame* frame = aNode->AsContent()->GetPrimaryFrame();
nsImageFrame* imageFrame = do_QueryFrame(frame);
if (imageFrame) {
Accessible* parent = GetAccessible(imageFrame->GetContent());
if (parent) {
Accessible* area = parent->AsImageMap()->GetChildAccessibleFor(aNode);
if (area) return area;
return nullptr;
}
}
return GetAccessible(aNode);
}
////////////////////////////////////////////////////////////////////////////////
// Protected members
void DocAccessible::NotifyOfLoading(bool aIsReloading) {
// Mark the document accessible as loading, if it stays alive then we'll mark
// it as loaded when we receive proper notification.
mLoadState &= ~eDOMLoaded;
if (!IsLoadEventTarget()) return;
if (aIsReloading && !mLoadEventType &&
// We can't fire events on a document whose tree isn't constructed yet.
HasLoadState(eTreeConstructed)) {
// Fire reload and state busy events on existing document accessible while
// event from user input flag can be calculated properly and accessible
// is alive. When new document gets loaded then this one is destroyed.
RefPtr<AccEvent> reloadEvent =
new AccEvent(nsIAccessibleEvent::EVENT_DOCUMENT_RELOAD, this);
nsEventShell::FireEvent(reloadEvent);
}
// Fire state busy change event. Use delayed event since we don't care
// actually if event isn't delivered when the document goes away like a shot.
RefPtr<AccEvent> stateEvent =
new AccStateChangeEvent(this, states::BUSY, true);
FireDelayedEvent(stateEvent);
}
void DocAccessible::DoInitialUpdate() {
if (nsCoreUtils::IsTopLevelContentDocInProcess(mDocumentNode)) {
mDocFlags |= eTopLevelContentDocInProcess;
if (IPCAccessibilityActive()) {
nsIDocShell* docShell = mDocumentNode->GetDocShell();
if (RefPtr<dom::BrowserChild> browserChild =
dom::BrowserChild::GetFrom(docShell)) {
// In content processes, top level content documents are always
// RootAccessibles.
MOZ_ASSERT(IsRoot());
DocAccessibleChild* ipcDoc = IPCDoc();
if (ipcDoc) {
browserChild->SetTopLevelDocAccessibleChild(ipcDoc);
} else {
ipcDoc = new DocAccessibleChild(this, browserChild);
SetIPCDoc(ipcDoc);
// Subsequent initialization might depend on being able to get the
// top level DocAccessibleChild, so set that as early as possible.
browserChild->SetTopLevelDocAccessibleChild(ipcDoc);
#if defined(XP_WIN)
IAccessibleHolder holder(
CreateHolderFromAccessible(WrapNotNull(this)));
MOZ_ASSERT(!holder.IsNull());
int32_t childID = AccessibleWrap::GetChildIDFor(this);
#else
int32_t holder = 0, childID = 0;
#endif
browserChild->SendPDocAccessibleConstructor(ipcDoc, nullptr, 0,
childID, holder);
#if !defined(XP_WIN)
ipcDoc->SendPDocAccessiblePlatformExtConstructor();
#endif
}
#if !defined(XP_WIN)
// It's safe for us to mark top level documents as constructed in the
// parent process without receiving an explicit message, since we can
// never get queries for this document or descendants before parent
// process construction is complete.
ipcDoc->SetConstructedInParentProcess();
#endif
}
}
}
mLoadState |= eTreeConstructed;
// Set up a root element and ARIA role mapping.
UpdateRootElIfNeeded();
// Build initial tree.
CacheChildrenInSubtree(this);
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eVerbose)) {
logging::Tree("TREE", "Initial subtree", this);
}
#endif
// Fire reorder event after the document tree is constructed. Note, since
// this reorder event is processed by parent document then events targeted to
// this document may be fired prior to this reorder event. If this is
// a problem then consider to keep event processing per tab document.
if (!IsRoot()) {
RefPtr<AccReorderEvent> reorderEvent = new AccReorderEvent(Parent());
ParentDocument()->FireDelayedEvent(reorderEvent);
}
if (IPCAccessibilityActive()) {
DocAccessibleChild* ipcDoc = IPCDoc();
MOZ_ASSERT(ipcDoc);
if (ipcDoc) {
for (auto idx = 0U; idx < mChildren.Length(); idx++) {
ipcDoc->InsertIntoIpcTree(this, mChildren.ElementAt(idx), idx);
}
}
}
}
void DocAccessible::ProcessLoad() {
mLoadState |= eCompletelyLoaded;
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eDocLoad))
logging::DocCompleteLoad(this, IsLoadEventTarget());
#endif
// Do not fire document complete/stop events for root chrome document
// accessibles and for frame/iframe documents because
// a) screen readers start working on focus event in the case of root chrome
// documents
// b) document load event on sub documents causes screen readers to act is if
// entire page is reloaded.
if (!IsLoadEventTarget()) return;
// Fire complete/load stopped if the load event type is given.
if (mLoadEventType) {
RefPtr<AccEvent> loadEvent = new AccEvent(mLoadEventType, this);
FireDelayedEvent(loadEvent);
mLoadEventType = 0;
}
// Fire busy state change event.
RefPtr<AccEvent> stateEvent =
new AccStateChangeEvent(this, states::BUSY, false);
FireDelayedEvent(stateEvent);
}
void DocAccessible::AddDependentIDsFor(Accessible* aRelProvider,
nsAtom* aRelAttr) {
dom::Element* relProviderEl = aRelProvider->Elm();
if (!relProviderEl) return;
for (uint32_t idx = 0; idx < kRelationAttrsLen; idx++) {
nsStaticAtom* relAttr = kRelationAttrs[idx];
if (aRelAttr && aRelAttr != relAttr) continue;
if (relAttr == nsGkAtoms::_for) {
if (!relProviderEl->IsAnyOfHTMLElements(nsGkAtoms::label,
nsGkAtoms::output))
continue;
} else if (relAttr == nsGkAtoms::control) {
if (!relProviderEl->IsAnyOfXULElements(nsGkAtoms::label,
nsGkAtoms::description))
continue;
}
IDRefsIterator iter(this, relProviderEl, relAttr);
while (true) {
const nsDependentSubstring id = iter.NextID();
if (id.IsEmpty()) break;
nsIContent* dependentContent = iter.GetElem(id);
if (!dependentContent ||
(relAttr == nsGkAtoms::aria_owns &&
!aRelProvider->IsAcceptableChild(dependentContent)))
continue;
AttrRelProviders* providers =
GetOrCreateRelProviders(dependentContent->AsElement(), id);
if (providers) {
AttrRelProvider* provider = new AttrRelProvider(relAttr, relProviderEl);
if (provider) {
providers->AppendElement(provider);
// We've got here during the children caching. If the referenced
// content is not accessible then store it to pend its container
// children invalidation (this happens immediately after the caching
// is finished).
if (dependentContent) {
if (!HasAccessible(dependentContent)) {
mInvalidationList.AppendElement(dependentContent);
}
}
}
}
}
// If the relation attribute is given then we don't have anything else to
// check.
if (aRelAttr) break;
}
// Make sure to schedule the tree update if needed.
mNotificationController->ScheduleProcessing();
}
void DocAccessible::RemoveDependentIDsFor(Accessible* aRelProvider,
nsAtom* aRelAttr) {
dom::Element* relProviderElm = aRelProvider->Elm();
if (!relProviderElm) return;
for (uint32_t idx = 0; idx < kRelationAttrsLen; idx++) {
nsStaticAtom* relAttr = kRelationAttrs[idx];
if (aRelAttr && aRelAttr != kRelationAttrs[idx]) continue;
IDRefsIterator iter(this, relProviderElm, relAttr);
while (true) {
const nsDependentSubstring id = iter.NextID();
if (id.IsEmpty()) break;
AttrRelProviders* providers = GetRelProviders(relProviderElm, id);
if (providers) {
providers->RemoveElementsBy(
[relAttr, relProviderElm](const auto& provider) {
return provider->mRelAttr == relAttr &&
provider->mContent == relProviderElm;
});
RemoveRelProvidersIfEmpty(relProviderElm, id);
}
}
// If the relation attribute is given then we don't have anything else to
// check.
if (aRelAttr) break;
}
}
bool DocAccessible::UpdateAccessibleOnAttrChange(dom::Element* aElement,
nsAtom* aAttribute) {
if (aAttribute == nsGkAtoms::role) {
// It is common for js libraries to set the role on the body element after
// the document has loaded. In this case we just update the role map entry.
if (mContent == aElement) {
SetRoleMapEntryForDoc(aElement);
if (mIPCDoc) {
mIPCDoc->SendRoleChangedEvent(Role());
}
return true;
}
// Recreate the accessible when role is changed because we might require a
// different accessible class for the new role or the accessible may expose
// a different sets of interfaces (COM restriction).
RecreateAccessible(aElement);
return true;
}
if (aAttribute == nsGkAtoms::aria_multiselectable &&
aElement->HasAttr(kNameSpaceID_None, nsGkAtoms::role)) {
// This affects whether the accessible supports SelectAccessible.
// COM says we cannot change what interfaces are supported on-the-fly,
// so invalidate this object. A new one will be created on demand.
RecreateAccessible(aElement);
return true;
}
if (aAttribute == nsGkAtoms::type) {
// If the input[type] changes, we should recreate the accessible.
RecreateAccessible(aElement);
return true;
}
return false;
}
void DocAccessible::UpdateRootElIfNeeded() {
dom::Element* rootEl = mDocumentNode->GetBodyElement();
if (!rootEl) {
rootEl = mDocumentNode->GetRootElement();
}
if (rootEl != mContent) {
mContent = rootEl;
SetRoleMapEntryForDoc(rootEl);
if (mIPCDoc) {
mIPCDoc->SendRoleChangedEvent(Role());
}
}
}
/**
* Content insertion helper.
*/
class InsertIterator final {
public:
InsertIterator(Accessible* aContext,
const nsTArray<nsCOMPtr<nsIContent>>* aNodes)
: mChild(nullptr),
mChildBefore(nullptr),
mWalker(aContext),
mNodes(aNodes),
mNodesIdx(0) {
MOZ_ASSERT(aContext, "No context");
MOZ_ASSERT(aNodes, "No nodes to search for accessible elements");
MOZ_COUNT_CTOR(InsertIterator);
}
MOZ_COUNTED_DTOR(InsertIterator)
Accessible* Context() const { return mWalker.Context(); }
Accessible* Child() const { return mChild; }
Accessible* ChildBefore() const { return mChildBefore; }
DocAccessible* Document() const { return mWalker.Document(); }
/**
* Iterates to a next accessible within the inserted content.
*/
bool Next();
void Rejected() {
mChild = nullptr;
mChildBefore = nullptr;
}
private:
Accessible* mChild;
Accessible* mChildBefore;
TreeWalker mWalker;
const nsTArray<nsCOMPtr<nsIContent>>* mNodes;
nsTHashtable<nsPtrHashKey<const nsIContent>> mProcessedNodes;
uint32_t mNodesIdx;
};
bool InsertIterator::Next() {
if (mNodesIdx > 0) {
Accessible* nextChild = mWalker.Next();
if (nextChild) {
mChildBefore = mChild;
mChild = nextChild;
return true;
}
}
while (mNodesIdx < mNodes->Length()) {
// Ignore nodes that are not contained by the container anymore.
// The container might be changed, for example, because of the subsequent
// overlapping content insertion (i.e. other content was inserted between
// this inserted content and its container or the content was reinserted
// into different container of unrelated part of tree). To avoid a double
// processing of the content insertion ignore this insertion notification.
// Note, the inserted content might be not in tree at all at this point
// what means there's no container. Ignore the insertion too.
nsIContent* prevNode = mNodes->SafeElementAt(mNodesIdx - 1);
nsIContent* node = mNodes->ElementAt(mNodesIdx++);
// Check to see if we already processed this node with this iterator.
// this can happen if we get two redundant insertions in the case of a
// text and frame insertion.
if (!mProcessedNodes.EnsureInserted(node)) {
continue;
}
Accessible* container = Document()->AccessibleOrTrueContainer(
node->GetFlattenedTreeParentNode(), true);
if (container != Context()) {
continue;
}
// HTML comboboxes have no-content list accessible as an intermediate
// containing all options.
if (container->IsHTMLCombobox()) {
container = container->FirstChild();
}
if (!container->IsAcceptableChild(node)) {
continue;
}
#ifdef A11Y_LOG
logging::TreeInfo("traversing an inserted node", logging::eVerbose,
"container", container, "node", node);
#endif
// If inserted nodes are siblings then just move the walker next.
if (mChild && prevNode && prevNode->GetNextSibling() == node) {
Accessible* nextChild = mWalker.Scope(node);
if (nextChild) {
mChildBefore = mChild;
mChild = nextChild;
return true;
}
} else {
TreeWalker finder(container);
if (finder.Seek(node)) {
mChild = mWalker.Scope(node);
if (mChild) {
MOZ_ASSERT(!mChild->IsRelocated(), "child cannot be aria owned");
mChildBefore = finder.Prev();
return true;
}
}
}
}
return false;
}
void DocAccessible::ProcessContentInserted(
Accessible* aContainer, const nsTArray<nsCOMPtr<nsIContent>>* aNodes) {
// Process insertions if the container accessible is still in tree.
if (!aContainer->IsInDocument()) {
return;
}
// If new root content has been inserted then update it.
if (aContainer == this) {
UpdateRootElIfNeeded();
}
InsertIterator iter(aContainer, aNodes);
if (!iter.Next()) {
return;
}
#ifdef A11Y_LOG
logging::TreeInfo("children before insertion", logging::eVerbose, aContainer);
#endif
TreeMutation mt(aContainer);
do {
Accessible* parent = iter.Child()->Parent();
if (parent) {
Accessible* previousSibling = iter.ChildBefore();
if (parent != aContainer ||
iter.Child()->PrevSibling() != previousSibling) {
if (previousSibling && previousSibling->Parent() != aContainer) {
// previousSibling hasn't been moved into aContainer yet.
// previousSibling should be later in the insertion list, so the tree
// will get adjusted when we process it later.
MOZ_DIAGNOSTIC_ASSERT(parent == aContainer,
"Child moving to new parent, but previous "
"sibling in wrong parent");
continue;
}
#ifdef A11Y_LOG
logging::TreeInfo("relocating accessible", 0, "old parent", parent,
"new parent", aContainer, "child", iter.Child(),
nullptr);
#endif
MoveChild(iter.Child(), aContainer,
previousSibling ? previousSibling->IndexInParent() + 1 : 0);
}
continue;
}
if (aContainer->InsertAfter(iter.Child(), iter.ChildBefore())) {
#ifdef A11Y_LOG
logging::TreeInfo("accessible was inserted", 0, "container", aContainer,
"child", iter.Child(), nullptr);
#endif
CreateSubtree(iter.Child());
mt.AfterInsertion(iter.Child());
continue;
}
MOZ_ASSERT_UNREACHABLE("accessible was rejected");
iter.Rejected();
} while (iter.Next());
mt.Done();
#ifdef A11Y_LOG
logging::TreeInfo("children after insertion", logging::eVerbose, aContainer);
#endif
FireEventsOnInsertion(aContainer);
}
void DocAccessible::ProcessContentInserted(Accessible* aContainer,
nsIContent* aNode) {
if (!aContainer->IsInDocument()) {
return;
}
#ifdef A11Y_LOG
logging::TreeInfo("children before insertion", logging::eVerbose, aContainer);
#endif
#ifdef A11Y_LOG
logging::TreeInfo("traversing an inserted node", logging::eVerbose,
"container", aContainer, "node", aNode);
#endif
TreeWalker walker(aContainer);
if (aContainer->IsAcceptableChild(aNode) && walker.Seek(aNode)) {
Accessible* child = GetAccessible(aNode);
if (!child) {
child = GetAccService()->CreateAccessible(aNode, aContainer);
}
if (child) {
TreeMutation mt(aContainer);
if (!aContainer->InsertAfter(child, walker.Prev())) {
return;
}
CreateSubtree(child);
mt.AfterInsertion(child);
mt.Done();
FireEventsOnInsertion(aContainer);
}
}
#ifdef A11Y_LOG
logging::TreeInfo("children after insertion", logging::eVerbose, aContainer);
#endif
}
void DocAccessible::FireEventsOnInsertion(Accessible* aContainer) {
// Check to see if change occurred inside an alert, and fire an EVENT_ALERT
// if it did.
if (aContainer->IsAlert() || aContainer->IsInsideAlert()) {
Accessible* ancestor = aContainer;
do {
if (ancestor->IsAlert()) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_ALERT, ancestor);
break;
}
} while ((ancestor = ancestor->Parent()));
}
}
void DocAccessible::ContentRemoved(Accessible* aChild) {
Accessible* parent = aChild->Parent();
MOZ_DIAGNOSTIC_ASSERT(parent, "Unattached accessible from tree");
#ifdef A11Y_LOG
logging::TreeInfo("process content removal", 0, "container", parent, "child",
aChild, nullptr);
#endif
// XXX: event coalescence may kill us
RefPtr<Accessible> kungFuDeathGripChild(aChild);
TreeMutation mt(parent);
mt.BeforeRemoval(aChild);
if (aChild->IsDefunct()) {
MOZ_ASSERT_UNREACHABLE("Event coalescence killed the accessible");
mt.Done();
return;
}
MOZ_DIAGNOSTIC_ASSERT(aChild->Parent(), "Alive but unparented #1");
if (aChild->IsRelocated()) {
nsTArray<RefPtr<Accessible>>* owned = mARIAOwnsHash.Get(parent);
MOZ_ASSERT(owned, "IsRelocated flag is out of sync with mARIAOwnsHash");
owned->RemoveElement(aChild);
if (owned->Length() == 0) {
mARIAOwnsHash.Remove(parent);
}
}
MOZ_DIAGNOSTIC_ASSERT(aChild->Parent(), "Unparented #2");
parent->RemoveChild(aChild);
UncacheChildrenInSubtree(aChild);
mt.Done();
}
void DocAccessible::ContentRemoved(nsIContent* aContentNode) {
// If child node is not accessible then look for its accessible children.
Accessible* acc = GetAccessible(aContentNode);
if (acc) {
ContentRemoved(acc);
}
dom::AllChildrenIterator iter =
dom::AllChildrenIterator(aContentNode, nsIContent::eAllChildren, true);
while (nsIContent* childNode = iter.GetNextChild()) {
ContentRemoved(childNode);
}
// If this node has a shadow root, remove its explicit children too.
// The host node may be removed after the shadow root was attached, and
// before we asynchronously prune the light DOM and construct the shadow DOM.
// If this is a case where the node does not have its own accessible, we will
// not recurse into its current children, so we need to use an
// ExplicitChildIterator in order to get its accessible children in the light
// DOM, since they are not accessible anymore via AllChildrenIterator.
if (aContentNode->GetShadowRoot()) {
dom::ExplicitChildIterator iter = dom::ExplicitChildIterator(aContentNode);
while (nsIContent* childNode = iter.GetNextChild()) {
ContentRemoved(childNode);
}
}
}
bool DocAccessible::RelocateARIAOwnedIfNeeded(nsIContent* aElement) {
if (!aElement->HasID()) return false;
AttrRelProviders* list = GetRelProviders(
aElement->AsElement(), nsDependentAtomString(aElement->GetID()));
if (list) {
for (uint32_t idx = 0; idx < list->Length(); idx++) {
if (list->ElementAt(idx)->mRelAttr == nsGkAtoms::aria_owns) {
Accessible* owner = GetAccessible(list->ElementAt(idx)->mContent);
if (owner) {
mNotificationController->ScheduleRelocation(owner);
return true;
}
}
}
}
return false;
}
void DocAccessible::DoARIAOwnsRelocation(Accessible* aOwner) {
MOZ_ASSERT(aOwner, "aOwner must be a valid pointer");
MOZ_ASSERT(aOwner->Elm(), "aOwner->Elm() must be a valid pointer");
#ifdef A11Y_LOG
logging::TreeInfo("aria owns relocation", logging::eVerbose, aOwner);
#endif
nsTArray<RefPtr<Accessible>>* owned = mARIAOwnsHash.LookupOrAdd(aOwner);
IDRefsIterator iter(this, aOwner->Elm(), nsGkAtoms::aria_owns);
uint32_t idx = 0;
while (nsIContent* childEl = iter.NextElem()) {
Accessible* child = GetAccessible(childEl);
auto insertIdx = aOwner->ChildCount() - owned->Length() + idx;
// Make an attempt to create an accessible if it wasn't created yet.
if (!child) {
// An owned child cannot be an ancestor of the owner.
if (aOwner->Elm()->IsInclusiveDescendantOf(childEl)) {
continue;
}
if (aOwner->IsAcceptableChild(childEl)) {
child = GetAccService()->CreateAccessible(childEl, aOwner);
if (child) {
TreeMutation imut(aOwner);
aOwner->InsertChildAt(insertIdx, child);
imut.AfterInsertion(child);
imut.Done();
child->SetRelocated(true);
owned->InsertElementAt(idx, child);
idx++;
// Create subtree before adjusting the insertion index, since subtree
// creation may alter children in the container.
CreateSubtree(child);
FireEventsOnInsertion(aOwner);
}
}
continue;
}
#ifdef A11Y_LOG
logging::TreeInfo("aria owns traversal", logging::eVerbose, "candidate",
child, nullptr);
#endif
if (owned->IndexOf(child) < idx) {
continue; // ignore second entry of same ID
}
// Same child on same position, no change.
if (child->Parent() == aOwner) {
int32_t indexInParent = child->IndexInParent();
// The child is being placed in its current index,
// eg. aria-owns='id1 id2 id3' is changed to aria-owns='id3 id2 id1'.
if (indexInParent == static_cast<int32_t>(insertIdx)) {
MOZ_ASSERT(child->IsRelocated(),
"A child, having an index in parent from aria ownded "
"indices range, has to be aria owned");
MOZ_ASSERT(owned->ElementAt(idx) == child,
"Unexpected child in ARIA owned array");
idx++;
continue;
}
// The child is being inserted directly after its current index,
// resulting in a no-move case. This will happen when a parent aria-owns
// its last ordinal child:
// <ul aria-owns='id2'><li id='id1'></li><li id='id2'></li></ul>
if (indexInParent == static_cast<int32_t>(insertIdx) - 1) {
MOZ_ASSERT(!child->IsRelocated(),
"Child should be in its ordinal position");
child->SetRelocated(true);
owned->InsertElementAt(idx, child);
idx++;
continue;
}
}
MOZ_ASSERT(owned->SafeElementAt(idx) != child, "Already in place!");
// A new child is found, check for loops.
if (child->Parent() != aOwner) {
// Child is aria-owned by another container, skip.
if (child->IsRelocated()) {
continue;
}
Accessible* parent = aOwner;
while (parent && parent != child && !parent->IsDoc()) {
parent = parent->Parent();
}
// A referred child cannot be a parent of the owner.
if (parent == child) {
continue;
}
}
if (MoveChild(child, aOwner, insertIdx)) {
child->SetRelocated(true);
MOZ_ASSERT(owned == mARIAOwnsHash.Get(aOwner));
owned = mARIAOwnsHash.LookupOrAdd(aOwner);
owned->InsertElementAt(idx, child);
idx++;
}
}
// Put back children that are not seized anymore.
PutChildrenBack(owned, idx);
if (owned->Length() == 0) {
mARIAOwnsHash.Remove(aOwner);
}
}
void DocAccessible::PutChildrenBack(nsTArray<RefPtr<Accessible>>* aChildren,
uint32_t aStartIdx) {
MOZ_ASSERT(aStartIdx <= aChildren->Length(), "Wrong removal index");
for (auto idx = aStartIdx; idx < aChildren->Length(); idx++) {
Accessible* child = aChildren->ElementAt(idx);
if (!child->IsInDocument()) {
continue;
}
// Remove the child from the owner
Accessible* owner = child->Parent();
if (!owner) {
NS_ERROR("Cannot put the child back. No parent, a broken tree.");
continue;
}
#ifdef A11Y_LOG
logging::TreeInfo("aria owns put child back", 0, "old parent", owner,
"child", child, nullptr);
#endif
// Unset relocated flag to find an insertion point for the child.
child->SetRelocated(false);
nsIContent* content = child->GetContent();
int32_t idxInParent = -1;
Accessible* origContainer =
AccessibleOrTrueContainer(content->GetFlattenedTreeParentNode());
if (origContainer) {
TreeWalker walker(origContainer);
if (walker.Seek(content)) {
Accessible* prevChild = walker.Prev();
if (prevChild) {
idxInParent = prevChild->IndexInParent() + 1;
MOZ_DIAGNOSTIC_ASSERT(origContainer == prevChild->Parent(),
"Broken tree");
origContainer = prevChild->Parent();
} else {
idxInParent = 0;
}
}
}
// The child may have already be in its ordinal place for 2 reasons:
// 1. It was the last ordinal child, and the first aria-owned child.
// given: <ul id="list" aria-owns="b"><li id="a"></li><li
// id="b"></li></ul> after load: $("list").setAttribute("aria-owns", "");
// 2. The preceding adopted children were just reclaimed, eg:
// given: <ul id="list"><li id="b"></li></ul>
// after load: $("list").setAttribute("aria-owns", "a b");
// later: $("list").setAttribute("aria-owns", "");
if (origContainer != owner || child->IndexInParent() != idxInParent) {
DebugOnly<bool> moved = MoveChild(child, origContainer, idxInParent);
MOZ_ASSERT(moved, "Failed to put child back.");
} else {
MOZ_ASSERT(!child->PrevSibling() || !child->PrevSibling()->IsRelocated(),
"No relocated child should appear before this one");
MOZ_ASSERT(!child->NextSibling() || child->NextSibling()->IsRelocated(),
"No ordinal child should appear after this one");
}
}
aChildren->RemoveLastElements(aChildren->Length() - aStartIdx);
}
bool DocAccessible::MoveChild(Accessible* aChild, Accessible* aNewParent,
int32_t aIdxInParent) {
MOZ_ASSERT(aChild, "No child");
MOZ_ASSERT(aChild->Parent(), "No parent");
// We can't guarantee MoveChild works correctly for accessibilities storing
// children outside mChildren.
MOZ_ASSERT(
aIdxInParent <= static_cast<int32_t>(aNewParent->mChildren.Length()),
"Wrong insertion point for a moving child");
Accessible* curParent = aChild->Parent();
if (!aNewParent->IsAcceptableChild(aChild->GetContent())) {
return false;
}
#ifdef A11Y_LOG
logging::TreeInfo("move child", 0, "old parent", curParent, "new parent",
aNewParent, "child", aChild, nullptr);
#endif
// Forget aria-owns info in case of ARIA owned element. The caller is expected
// to update it if needed.
if (aChild->IsRelocated()) {
aChild->SetRelocated(false);
nsTArray<RefPtr<Accessible>>* owned = mARIAOwnsHash.Get(curParent);
MOZ_ASSERT(owned, "IsRelocated flag is out of sync with mARIAOwnsHash");
owned->RemoveElement(aChild);
if (owned->Length() == 0) {
mARIAOwnsHash.Remove(curParent);
}
}
NotificationController::MoveGuard mguard(mNotificationController);
if (curParent == aNewParent) {
MOZ_ASSERT(aChild->IndexInParent() != aIdxInParent, "No move case");
curParent->RelocateChild(aIdxInParent, aChild);
#ifdef A11Y_LOG
logging::TreeInfo("move child: parent tree after", logging::eVerbose,
curParent);
#endif
return true;
}
// If the child cannot be re-inserted into the tree, then make sure to remove
// it from its present parent and then shutdown it.
bool hasInsertionPoint =
(aIdxInParent >= 0) &&
(aIdxInParent <= static_cast<int32_t>(aNewParent->mChildren.Length()));
TreeMutation rmut(curParent);
rmut.BeforeRemoval(aChild, hasInsertionPoint && TreeMutation::kNoShutdown);
curParent->RemoveChild(aChild);
rmut.Done();
// No insertion point for the child.
if (!hasInsertionPoint) {
return true;
}
TreeMutation imut(aNewParent);
aNewParent->InsertChildAt(aIdxInParent, aChild);
imut.AfterInsertion(aChild);
imut.Done();
#ifdef A11Y_LOG
logging::TreeInfo("move child: old parent tree after", logging::eVerbose,
curParent);
logging::TreeInfo("move child: new parent tree after", logging::eVerbose,
aNewParent);
#endif
return true;
}
void DocAccessible::CacheChildrenInSubtree(Accessible* aRoot,
Accessible** aFocusedAcc) {
// If the accessible is focused then report a focus event after all related
// mutation events.
if (aFocusedAcc && !*aFocusedAcc &&
FocusMgr()->HasDOMFocus(aRoot->GetContent()))
*aFocusedAcc = aRoot;
Accessible* root = aRoot->IsHTMLCombobox() ? aRoot->FirstChild() : aRoot;
if (root->KidsFromDOM()) {
TreeMutation mt(root, TreeMutation::kNoEvents);
TreeWalker walker(root);
while (Accessible* child = walker.Next()) {
if (child->IsBoundToParent()) {
MoveChild(child, root, root->mChildren.Length());
continue;
}
root->AppendChild(child);
mt.AfterInsertion(child);
CacheChildrenInSubtree(child, aFocusedAcc);
}
mt.Done();
}
// Fire events for ARIA elements.
if (!aRoot->HasARIARole()) {
return;
}
// XXX: we should delay document load complete event if the ARIA document
// has aria-busy.
roles::Role role = aRoot->ARIARole();
if (!aRoot->IsDoc() &&
(role == roles::DIALOG || role == roles::NON_NATIVE_DOCUMENT)) {
FireDelayedEvent(nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE, aRoot);
}
}
void DocAccessible::UncacheChildrenInSubtree(Accessible* aRoot) {
aRoot->mStateFlags |= eIsNotInDocument;
RemoveDependentIDsFor(aRoot);
nsTArray<RefPtr<Accessible>>* owned = mARIAOwnsHash.Get(aRoot);
uint32_t count = aRoot->ContentChildCount();
for (uint32_t idx = 0; idx < count; idx++) {
Accessible* child = aRoot->ContentChildAt(idx);
if (child->IsRelocated()) {
MOZ_ASSERT(owned, "IsRelocated flag is out of sync with mARIAOwnsHash");
owned->RemoveElement(child);
if (owned->Length() == 0) {
mARIAOwnsHash.Remove(aRoot);
owned = nullptr;
}
}
// Removing this accessible from the document doesn't mean anything about
// accessibles for subdocuments, so skip removing those from the tree.
if (!child->IsDoc()) {
UncacheChildrenInSubtree(child);
}
}
if (aRoot->IsNodeMapEntry() &&
mNodeToAccessibleMap.Get(aRoot->GetNode()) == aRoot)
mNodeToAccessibleMap.Remove(aRoot->GetNode());
}
void DocAccessible::ShutdownChildrenInSubtree(Accessible* aAccessible) {
// Traverse through children and shutdown them before this accessible. When
// child gets shutdown then it removes itself from children array of its
// parent. Use jdx index to process the cases if child is not attached to the
// parent and as result doesn't remove itself from its children.
uint32_t count = aAccessible->ContentChildCount();
for (uint32_t idx = 0, jdx = 0; idx < count; idx++) {
Accessible* child = aAccessible->ContentChildAt(jdx);
if (!child->IsBoundToParent()) {
NS_ERROR("Parent refers to a child, child doesn't refer to parent!");
jdx++;
}
// Don't cross document boundaries. The outerdoc shutdown takes care about
// its subdocument.
if (!child->IsDoc()) ShutdownChildrenInSubtree(child);
}
UnbindFromDocument(aAccessible);
}
bool DocAccessible::IsLoadEventTarget() const {
nsCOMPtr<nsIDocShellTreeItem> treeItem = mDocumentNode->GetDocShell();
NS_ASSERTION(treeItem, "No document shell for document!");
nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
treeItem->GetInProcessParent(getter_AddRefs(parentTreeItem));
// Not a root document.
if (parentTreeItem) {
// Return true if it's either:
// a) tab document;
nsCOMPtr<nsIDocShellTreeItem> rootTreeItem;
treeItem->GetInProcessRootTreeItem(getter_AddRefs(rootTreeItem));
if (parentTreeItem == rootTreeItem) return true;
// b) frame/iframe document and its parent document is not in loading state
// Note: we can get notifications while document is loading (and thus
// while there's no parent document yet).
DocAccessible* parentDoc = ParentDocument();
return parentDoc && parentDoc->HasLoadState(eCompletelyLoaded);
}
// It's content (not chrome) root document.
return (treeItem->ItemType() == nsIDocShellTreeItem::typeContent);
}
void DocAccessible::SetIPCDoc(DocAccessibleChild* aIPCDoc) {
MOZ_ASSERT(!mIPCDoc || !aIPCDoc, "Clobbering an attached IPCDoc!");
mIPCDoc = aIPCDoc;
}
void DocAccessible::DispatchScrollingEvent(nsINode* aTarget,
uint32_t aEventType) {
Accessible* acc = GetAccessible(aTarget);
if (!acc) {
return;
}
nsIFrame* frame = acc->GetFrame();
if (!frame) {
// Although the accessible had a frame at scroll time, it may now be gone
// because of display: contents.
return;
}
LayoutDevicePoint scrollPoint;
LayoutDeviceRect scrollRange;
nsIScrollableFrame* sf = acc == this
? mPresShell->GetRootScrollFrameAsScrollable()
: frame->GetScrollTargetFrame();
// If there is no scrollable frame, it's likely a scroll in a popup, like
// <select>. Just send an event with no scroll info. The scroll info
// is currently only used on Android, and popups are rendered natively
// there.
if (sf) {
int32_t appUnitsPerDevPixel =
mPresShell->GetPresContext()->AppUnitsPerDevPixel();
scrollPoint = LayoutDevicePoint::FromAppUnits(sf->GetScrollPosition(),
appUnitsPerDevPixel) *
mPresShell->GetResolution();
scrollRange = LayoutDeviceRect::FromAppUnits(sf->GetScrollRange(),
appUnitsPerDevPixel);
scrollRange.ScaleRoundOut(mPresShell->GetResolution());
}
RefPtr<AccEvent> event =
new AccScrollingEvent(aEventType, acc, scrollPoint.x, scrollPoint.y,
scrollRange.width, scrollRange.height);
nsEventShell::FireEvent(event);
}
void DocAccessible::ARIAActiveDescendantIDMaybeMoved(dom::Element* aElm) {
nsINode* focusNode = FocusMgr()->FocusedDOMNode();
// The focused element must be within this document.
if (!focusNode || focusNode->OwnerDoc() != mDocumentNode) {
return;
}
dom::Element* focusElm = nullptr;
if (focusNode == mDocumentNode) {
// The document is focused, so look for aria-activedescendant on the
// body/root.
focusElm = Elm();
if (!focusElm) {
return;
}
} else {
MOZ_ASSERT(focusNode->IsElement());
focusElm = focusNode->AsElement();
}
// Check if the focus has aria-activedescendant and whether
// it refers to the id just set on aElm.
nsAutoString id;
aElm->GetAttr(kNameSpaceID_None, nsGkAtoms::id, id);
if (!focusElm->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::aria_activedescendant, id,
eCaseMatters)) {
return;
}
// The aria-activedescendant target has probably changed.
Accessible* acc = GetAccessibleEvenIfNotInMapOrContainer(focusNode);
if (!acc) {
return;
}
// The active descendant might have just been inserted and may not be in the
// tree yet. Therefore, schedule this async to ensure the tree is up to date.
mNotificationController->ScheduleNotification<DocAccessible, Accessible>(
this, &DocAccessible::ARIAActiveDescendantChanged, acc);
}
void DocAccessible::SetRoleMapEntryForDoc(dom::Element* aElement) {
const nsRoleMapEntry* entry = aria::GetRoleMap(aElement);
if (!entry || entry->role == roles::APPLICATION ||
entry->role == roles::DIALOG ||
// Role alert isn't valid on the body element according to the ARIA spec,
// but it's useful for our UI; e.g. the WebRTC sharing indicator.
(entry->role == roles::ALERT &&
!nsCoreUtils::IsContentDocument(mDocumentNode))) {
SetRoleMapEntry(entry);
return;
}
// No other ARIA roles are valid on body elements.
SetRoleMapEntry(nullptr);
}
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