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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 "nsEventShell.h"
#include "nsTextEquivUtils.h"
#include "Role.h"
#include "RootAccessible.h"
#include "TreeWalker.h"
#include "xpcAccessibleDocument.h"
#include "nsIMutableArray.h"
#include "nsICommandManager.h"
#include "nsIDocShell.h"
#include "nsIDocument.h"
#include "nsIDOMAttr.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMDocument.h"
#include "nsIDOMXULDocument.h"
#include "nsIDOMMutationEvent.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMXULPopupElement.h"
#include "nsIEditingSession.h"
#include "nsIFrame.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsImageFrame.h"
#include "nsIPersistentProperties2.h"
#include "nsIPresShell.h"
#include "nsIServiceManager.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/dom/TabChild.h"
#include "mozilla/dom/DocumentType.h"
#include "mozilla/dom/Element.h"
#ifdef MOZ_XUL
#include "nsIXULDocument.h"
#endif
using namespace mozilla;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// Static member initialization
static nsIAtom** 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(nsIDocument* aDocument, nsIPresShell* 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),
mScrollPositionChangedTicks(0),
mLoadState(eTreeConstructionPending), mDocFlags(0), mLoadEventType(0),
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);
// If this is a XUL Document, it should not implement nsHyperText
if (mDocumentNode && mDocumentNode->IsXULDocument())
mGenericTypes &= ~eHyperText;
}
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 iter = tmp->mDependentIDsHash.Iter(); !iter.Done(); iter.Next()) {
AttrRelProviderArray* providers = iter.UserData();
for (int32_t jdx = providers->Length() - 1; jdx >= 0; jdx--) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(
cb, "content of dependent ids hash entry of document accessible");
AttrRelProvider* provider = (*providers)[jdx];
cb.NoteXPCOMChild(provider->mContent);
NS_ASSERTION(provider->mContent->IsInUncomposedDoc(),
"Referred content is not in document!");
}
}
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->mDependentIDsHash.Clear();
tmp->mNodeToAccessibleMap.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mAccessibleCache)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mAnchorJumpElm)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mInvalidationList)
tmp->mARIAOwnsHash.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(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)
{
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()
{
nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(mDocumentNode);
if (docShell) {
nsCOMPtr<nsIDocShellTreeItem> sameTypeRoot;
docShell->GetSameTypeRootTreeItem(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) {
#ifdef MOZ_XUL
nsCOMPtr<nsIXULDocument> xulDoc(do_QueryInterface(mDocumentNode));
if (xulDoc)
return roles::APPLICATION;
#endif
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()
{
// 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;
}
nsCOMPtr<nsIEditor> editor = GetEditor();
state |= editor ? 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()
{
// Focus the document.
nsFocusManager* fm = nsFocusManager::GetFocusManager();
nsCOMPtr<nsIDOMElement> newFocus;
fm->MoveFocus(mDocumentNode->GetWindow(), nullptr,
nsFocusManager::MOVEFOCUS_ROOT, 0, getter_AddRefs(newFocus));
}
// HyperTextAccessible method
already_AddRefed<nsIEditor>
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
nsCOMPtr<nsIEditor> editor;
editingSession->GetEditorForWindow(mDocumentNode->GetWindow(), getter_AddRefs(editor));
if (!editor)
return nullptr;
bool isEditable = false;
editor->GetIsDocumentEditable(&isEditable);
if (isEditable)
return editor.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
{
#ifdef MOZ_XUL
nsCOMPtr<nsIXULDocument> xulDoc(do_QueryInterface(mDocumentNode));
if (xulDoc) {
aType.AssignLiteral("window"); // doctype not implemented for XUL at time of writing - causes assertion
return;
}
#endif
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() == nsIDocument::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();
nsCOMPtr<nsIDocument> kungFuDeathGripDoc = mDocumentNode;
mDocumentNode = nullptr;
if (mParent) {
DocAccessible* parentDocument = mParent->Document();
if (parentDocument)
parentDocument->RemoveChildDocument(this);
mParent->RemoveChild(this);
}
// 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
mDependentIDsHash.Clear();
mNodeToAccessibleMap.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, kungFuDeathGripDoc);
}
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();
nsIDocument *document = mDocumentNode;
nsIDocument *parentDoc = nullptr;
nsRect bounds;
while (document) {
nsIPresShell *presShell = document->GetShell();
if (!presShell)
return nsRect();
nsRect scrollPort;
nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollableExternal();
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->GetParentDocument();
}
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) {
nsCOMPtr<nsICommandManager> 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
// Remove scroll position listener
RemoveScrollListener();
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) {
nsCOMPtr<nsICommandManager> 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 && docAcc->mScrollPositionChangedTicks &&
++docAcc->mScrollPositionChangedTicks > 2) {
// Whenever scroll position changes, mScrollPositionChangeTicks gets reset to 1
// We only want to fire accessibilty scroll event when scrolling stops or pauses
// Therefore, we wait for no scroll events to occur between 2 ticks of this timer
// That indicates a pause in scrolling, so we fire the accessibilty scroll event
nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_SCROLLING_END, docAcc);
docAcc->mScrollPositionChangedTicks = 0;
if (docAcc->mScrollWatchTimer) {
docAcc->mScrollWatchTimer->Cancel();
docAcc->mScrollWatchTimer = nullptr;
NS_RELEASE(docAcc); // Release kung fu death grip
}
}
}
////////////////////////////////////////////////////////////////////////////////
// nsIScrollPositionListener
void
DocAccessible::ScrollPositionDidChange(nscoord aX, nscoord aY)
{
// Start new timer, if the timer cycles at least 1 full cycle without more scroll position changes,
// then the ::Notify() method will fire the accessibility event for scroll position changes
const uint32_t kScrollPosCheckWait = 50;
if (mScrollWatchTimer) {
mScrollWatchTimer->SetDelay(kScrollPosCheckWait); // Create new timer, to avoid leaks
}
else {
mScrollWatchTimer = do_CreateInstance("@mozilla.org/timer;1");
if (mScrollWatchTimer) {
NS_ADDREF_THIS(); // Kung fu death grip
mScrollWatchTimer->InitWithNamedFuncCallback(
ScrollTimerCallback,
this,
kScrollPosCheckWait,
nsITimer::TYPE_REPEATING_SLACK,
"a11y::DocAccessible::ScrollPositionDidChange");
}
}
mScrollPositionChangedTicks = 1;
}
////////////////////////////////////////////////////////////////////////////////
// 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,
PivotMoveReason aReason,
bool aIsFromUserInput)
{
RefPtr<AccEvent> event =
new AccVCChangeEvent(
this, (aOldAccessible ? aOldAccessible->ToInternalAccessible() : nullptr),
aOldStart, aOldEnd, aReason,
aIsFromUserInput ? eFromUserInput : eNoUserInput);
nsEventShell::FireEvent(event);
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// nsIDocumentObserver
NS_IMPL_NSIDOCUMENTOBSERVER_CORE_STUB(DocAccessible)
NS_IMPL_NSIDOCUMENTOBSERVER_LOAD_STUB(DocAccessible)
NS_IMPL_NSIDOCUMENTOBSERVER_STYLE_STUB(DocAccessible)
void
DocAccessible::AttributeWillChange(nsIDocument* aDocument,
dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute, int32_t aModType,
const nsAttrValue* aNewValue)
{
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 != nsIDOMMutationEvent::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 != nsIDOMMutationEvent::ADDITION) ?
nsAccUtils::GetARIAToken(aElement, aAttribute) : nullptr;
return;
}
if (aAttribute == nsGkAtoms::aria_disabled ||
aAttribute == nsGkAtoms::disabled)
mStateBitWasOn = accessible->Unavailable();
}
void
DocAccessible::NativeAnonymousChildListChange(nsIDocument* aDocument,
nsIContent* aContent,
bool aIsRemove)
{
}
void
DocAccessible::AttributeChanged(nsIDocument* aDocument,
dom::Element* aElement,
int32_t aNameSpaceID, nsIAtom* 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;
// 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);
// 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 == nsIDOMMutationEvent::MODIFICATION ||
aModType == nsIDOMMutationEvent::ADDITION) {
AddDependentIDsFor(accessible, aAttribute);
}
}
// DocAccessible protected member
void
DocAccessible::AttributeChangedImpl(Accessible* aAccessible,
int32_t aNameSpaceID, nsIAtom* aAttribute)
{
// 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) {
// Do nothing if state wasn't changed (like @aria-disabled was removed but
// @disabled is still presented).
if (aAccessible->Unavailable() == mStateBitWasOn)
return;
RefPtr<AccEvent> enabledChangeEvent =
new AccStateChangeEvent(aAccessible, states::ENABLED, mStateBitWasOn);
FireDelayedEvent(enabledChangeEvent);
RefPtr<AccEvent> sensitiveChangeEvent =
new AccStateChangeEvent(aAccessible, states::SENSITIVE, mStateBitWasOn);
FireDelayedEvent(sensitiveChangeEvent);
return;
}
// Check for namespaced ARIA attribute
if (aNameSpaceID == kNameSpaceID_None) {
// Check for hyphenated aria-foo property?
if (StringBeginsWith(nsDependentAtomString(aAttribute),
NS_LITERAL_STRING("aria-"))) {
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;
}
nsIContent* elm = aAccessible->GetContent();
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);
}
// 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);
return;
}
if (aAttribute == nsGkAtoms::value) {
if (aAccessible->IsProgress())
FireDelayedEvent(nsIAccessibleEvent::EVENT_VALUE_CHANGE, aAccessible);
}
}
// DocAccessible protected member
void
DocAccessible::ARIAAttributeChanged(Accessible* aAccessible, nsIAtom* 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.
if (aAttribute == nsGkAtoms::aria_activedescendant) {
mNotificationController->HandleNotification<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);
}
nsIContent* elm = aAccessible->GetContent();
// Update aria-hidden flag for the whole subtree iff aria-hidden is changed
// on the root, i.e. ignore any affiliated aria-hidden changes in the subtree
// of top aria-hidden.
if (aAttribute == nsGkAtoms::aria_hidden) {
bool isDefined = aria::HasDefinedARIAHidden(elm);
if (isDefined != aAccessible->IsARIAHidden() &&
(!aAccessible->Parent() || !aAccessible->Parent()->IsARIAHidden())) {
aAccessible->SetARIAHidden(isDefined);
RefPtr<AccEvent> event =
new AccObjectAttrChangedEvent(aAccessible, aAttribute);
FireDelayedEvent(event);
}
return;
}
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_owns) {
mNotificationController->ScheduleRelocation(aAccessible);
}
}
void
DocAccessible::ARIAActiveDescendantChanged(Accessible* aAccessible)
{
nsIContent* elm = aAccessible->GetContent();
if (elm && aAccessible->IsActiveWidget()) {
nsAutoString id;
if (elm->GetAttr(kNameSpaceID_None, nsGkAtoms::aria_activedescendant, id)) {
dom::Element* activeDescendantElm = elm->OwnerDoc()->GetElementById(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
}
}
}
}
}
void
DocAccessible::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t /* unused */)
{
}
void
DocAccessible::ContentStateChanged(nsIDocument* 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_VISITED)) {
RefPtr<AccEvent> event =
new AccStateChangeEvent(accessible, states::TRAVERSED, true);
FireDelayedEvent(event);
}
}
void
DocAccessible::DocumentStatesChanged(nsIDocument* aDocument,
EventStates aStateMask)
{
}
void
DocAccessible::CharacterDataWillChange(nsIDocument* aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
}
void
DocAccessible::CharacterDataChanged(nsIDocument* aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
}
void
DocAccessible::ContentInserted(nsIDocument* aDocument, nsIContent* aContainer,
nsIContent* aChild, int32_t /* unused */)
{
}
void
DocAccessible::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainerNode,
nsIContent* aChildNode, int32_t /* unused */,
nsIContent* aPreviousSiblingNode)
{
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eTree)) {
logging::MsgBegin("TREE", "DOM content removed; doc: %p", this);
logging::Node("container node", aContainerNode);
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) const
{
if (!aNode || !aNode->GetComposedDoc())
return nullptr;
nsINode* currNode = aNode;
Accessible* accessible = nullptr;
while (!(accessible = GetAccessible(currNode))) {
nsINode* parent = nullptr;
// If this is a content node, try to get a flattened parent content node.
// This will smartly skip from the shadow root to the host element,
// over parentless document fragment
if (currNode->IsContent())
parent = currNode->AsContent()->GetFlattenedTreeParent();
// Fallback to just get parent node, in case there is no parent content
// node. Or current node is not a content node.
if (!parent)
parent = currNode->GetParentNode();
if (!(currNode = parent)) break;
}
return accessible;
}
Accessible*
DocAccessible::GetAccessibleOrDescendant(nsINode* aNode) const
{
Accessible* acc = GetAccessible(aNode);
if (acc)
return acc;
acc = GetContainerAccessible(aNode);
if (acc) {
uint32_t childCnt = acc->ChildCount();
for (uint32_t idx = 0; idx < childCnt; idx++) {
Accessible* child = acc->GetChildAt(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(), aAccessible);
aAccessible->SetRoleMapEntry(aRoleMapEntry);
AddDependentIDsFor(aAccessible);
if (aAccessible->HasOwnContent()) {
nsIContent* el = aAccessible->GetContent();
if (el->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 active item was removed
// from the tree.
if (FocusMgr()->IsActiveItem(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());
// 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* aContainerNode,
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)) {
// Update the whole tree of this document accessible when the container is
// null (document element is inserted or removed).
Accessible* container = aContainerNode ?
AccessibleOrTrueContainer(aContainerNode) : this;
if (container) {
// Ignore notification if the container node is no longer in the DOM tree.
mNotificationController->ScheduleContentInsertion(container,
aStartChildNode,
aEndChildNode);
}
}
}
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.
nsIContent* parent = aContent->GetFlattenedTreeParent();
ContentRemoved(aContent);
ContentInserted(parent, 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.
AttrRelProviderArray* list =
mDependentIDsHash.Get(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) {
// 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::IsTabDocument(mDocumentNode)) {
mDocFlags |= eTabDocument;
if (IPCAccessibilityActive()) {
nsIDocShell* docShell = mDocumentNode->GetDocShell();
if (RefPtr<dom::TabChild> tabChild = dom::TabChild::GetFrom(docShell)) {
DocAccessibleChild* ipcDoc = new DocAccessibleChild(this, tabChild);
SetIPCDoc(ipcDoc);
if (IsRoot()) {
tabChild->SetTopLevelDocAccessibleChild(ipcDoc);
}
#if defined(XP_WIN)
IAccessibleHolder holder(CreateHolderFromAccessible(this));
int32_t childID = AccessibleWrap::GetChildIDFor(this);
#else
int32_t holder = 0, childID = 0;
#endif
tabChild->SendPDocAccessibleConstructor(ipcDoc, nullptr, 0, childID,
holder);
}
}
}
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);
}
TreeMutation mt(this);
uint32_t childCount = ChildCount();
for (uint32_t i = 0; i < childCount; i++) {
Accessible* child = GetChildAt(i);
mt.AfterInsertion(child);
}
mt.Done();
}
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, nsIAtom* aRelAttr)
{
dom::Element* relProviderEl = aRelProvider->Elm();
if (!relProviderEl)
return;
for (uint32_t idx = 0; idx < kRelationAttrsLen; idx++) {
nsIAtom* 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;
AttrRelProviderArray* providers = mDependentIDsHash.Get(id);
if (!providers) {
providers = new AttrRelProviderArray();
if (providers) {
mDependentIDsHash.Put(id, providers);
}
}
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).
nsIContent* dependentContent = iter.GetElem(id);
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,
nsIAtom* aRelAttr)
{
dom::Element* relProviderElm = aRelProvider->Elm();
if (!relProviderElm)
return;
for (uint32_t idx = 0; idx < kRelationAttrsLen; idx++) {
nsIAtom* 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;
AttrRelProviderArray* providers = mDependentIDsHash.Get(id);
if (providers) {
for (uint32_t jdx = 0; jdx < providers->Length(); ) {
AttrRelProvider* provider = (*providers)[jdx];
if (provider->mRelAttr == relAttr &&
provider->mContent == relProviderElm)
providers->RemoveElement(provider);
else
jdx++;
}
if (providers->Length() == 0)
mDependentIDsHash.Remove(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,
nsIAtom* 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) {
SetRoleMapEntry(aria::GetRoleMap(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::href) {
// Not worth the expense to ensure which namespace these are in. It doesn't
// kill use to recreate the accessible even if the attribute was used in
// the wrong namespace or an element that doesn't support it.
// Make sure the accessible is recreated asynchronously to allow the content
// to handle the attribute change.
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;
}
return false;
}
void
DocAccessible::UpdateRootElIfNeeded()
{
dom::Element* rootEl = mDocumentNode->GetBodyElement();
if (!rootEl) {
rootEl = mDocumentNode->GetRootElement();
}
if (rootEl != mContent) {
mContent = rootEl;
SetRoleMapEntry(aria::GetRoleMap(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);
}
~InsertIterator() { MOZ_COUNT_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;
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++);
Accessible* container = Document()->AccessibleOrTrueContainer(node);
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) {
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) {
if (parent != aContainer) {
#ifdef A11Y_LOG
logging::TreeInfo("stealing accessible", 0,
"old parent", parent, "new parent",
aContainer, "child", iter.Child(), nullptr);
#endif
MOZ_ASSERT_UNREACHABLE("stealing accessible");
continue;
}
#ifdef A11Y_LOG
logging::TreeInfo("binding to same parent", logging::eVerbose,
"parent", aContainer, "child", iter.Child(), nullptr);
#endif
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);
}
}
bool
DocAccessible::RelocateARIAOwnedIfNeeded(nsIContent* aElement)
{
if (!aElement->HasID())
return false;
AttrRelProviderArray* list =
mDependentIDsHash.Get(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) {
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
// Same child on same position, no change.
if (child->Parent() == aOwner &&
child->IndexInParent() == static_cast<int32_t>(insertIdx)) {
MOZ_ASSERT(owned->ElementAt(idx) == child, "Not in sync!");
idx++;
continue;
}
MOZ_ASSERT(owned->SafeElementAt(idx) != child, "Already in place!");
if (owned->IndexOf(child) < idx) {
continue; // ignore second entry of same ID
}
// A new child is found, check for loops.
if (child->Parent() != aOwner) {
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);
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");
nsTArray<RefPtr<Accessible> > containers;
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);
int32_t idxInParent = -1;
Accessible* origContainer = GetContainerAccessible(child->GetContent());
if (origContainer) {
TreeWalker walker(origContainer);
if (walker.Seek(child->GetContent())) {
Accessible* prevChild = walker.Prev();
if (prevChild) {
idxInParent = prevChild->IndexInParent() + 1;
MOZ_DIAGNOSTIC_ASSERT(origContainer == prevChild->Parent(), "Broken tree");
origContainer = prevChild->Parent();
}
else {
idxInParent = 0;
}
}
}
MoveChild(child, origContainer, idxInParent);
}
aChildren->RemoveElementsAt(aStartIdx, aChildren->Length() - aStartIdx);
}
bool
DocAccessible::MoveChild(Accessible* aChild, Accessible* aNewParent,
int32_t aIdxInParent)
{
MOZ_ASSERT(aChild, "No child");
MOZ_ASSERT(aChild->Parent(), "No parent");
MOZ_ASSERT(aIdxInParent <= static_cast<int32_t>(aNewParent->ChildCount()),
"Wrong insertion point for a moving child");
Accessible* curParent = aChild->Parent();
#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->MoveChild(aIdxInParent, aChild);
#ifdef A11Y_LOG
logging::TreeInfo("move child: parent tree after",
logging::eVerbose, curParent);
#endif
return true;
}
if (!aNewParent->IsAcceptableChild(aChild->GetContent())) {
return false;
}
MOZ_ASSERT(aIdxInParent <= static_cast<int32_t>(aNewParent->ChildCount()),
"Wrong insertion point for a moving child");
// 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 != -1) ||
(aIdxInParent <= static_cast<int32_t>(aNewParent->ChildCount()));
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->ChildCount());
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::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->GetParent(getter_AddRefs(parentTreeItem));
// Not a root document.
if (parentTreeItem) {
// Return true if it's either:
// a) tab document;
nsCOMPtr<nsIDocShellTreeItem> rootTreeItem;
treeItem->GetRootTreeItem(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);
}
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