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Diffstat (limited to 'accessible/generic/DocAccessible.cpp')
| -rw-r--r-- | accessible/generic/DocAccessible.cpp | 2387 |
1 files changed, 2387 insertions, 0 deletions
diff --git a/accessible/generic/DocAccessible.cpp b/accessible/generic/DocAccessible.cpp new file mode 100644 index 000000000..c89aa189b --- /dev/null +++ b/accessible/generic/DocAccessible.cpp @@ -0,0 +1,2387 @@ +/* -*- 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/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->InitWithFuncCallback(ScrollTimerCallback, this, + kScrollPosCheckWait, + nsITimer::TYPE_REPEATING_SLACK); + } + } + 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_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. + Accessible* container = GetAccessibleOrContainer(aContainerNode); + if (container) { + UpdateTreeOnRemoval(container, 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()); + + 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* 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(parent, 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) { + // 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; + + 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::UpdateTreeOnRemoval(Accessible* aContainer, nsIContent* aChildNode) +{ + // If child node is not accessible then look for its accessible children. + Accessible* child = GetAccessible(aChildNode); +#ifdef A11Y_LOG + logging::TreeInfo("process content removal", 0, + "container", aContainer, "child", aChildNode); +#endif + + TreeMutation mt(aContainer); + if (child) { + RefPtr<Accessible> kungFuDeathGripChild(child); + mt.BeforeRemoval(child); + if (child->IsDefunct()) { + return; // event coalescence may kill us + } + + MOZ_ASSERT(aContainer == child->Parent(), "Wrong parent"); + aContainer->RemoveChild(child); + UncacheChildrenInSubtree(child); + mt.Done(); + return; + } + + TreeWalker walker(aContainer, aChildNode, TreeWalker::eWalkCache); + while (Accessible* child = walker.Next()) { + RefPtr<Accessible> kungFuDeathGripChild(child); + mt.BeforeRemoval(child); + if (child->IsDefunct()) { + return; // event coalescence may kill us + } + + MOZ_ASSERT(aContainer == child->Parent(), "Wrong parent"); + aContainer->RemoveChild(child); + UncacheChildrenInSubtree(child); + } + mt.Done(); +} + +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::ValidateARIAOwned() +{ + for (auto it = mARIAOwnsHash.Iter(); !it.Done(); it.Next()) { + Accessible* owner = it.Key(); + nsTArray<RefPtr<Accessible> >* children = it.UserData(); + + // Owner is about to die, put children back if applicable. + if (!mAccessibleCache.GetWeak(reinterpret_cast<void*>(owner)) || + !owner->IsInDocument()) { + PutChildrenBack(children, 0); + it.Remove(); + continue; + } + + for (uint32_t idx = 0; idx < children->Length(); idx++) { + Accessible* child = children->ElementAt(idx); + if (!child->IsInDocument()) { + children->RemoveElementAt(idx); + idx--; + continue; + } + + NS_ASSERTION(child->Parent(), "No parent for ARIA owned?"); + + // If DOM node doesn't have a frame anymore then shutdown its accessible. + if (child->Parent() && !child->GetFrame()) { + UpdateTreeOnRemoval(child->Parent(), child->GetContent()); + children->RemoveElementAt(idx); + idx--; + continue; + } + + NS_ASSERTION(child->Parent() == owner, + "Illigally stolen ARIA owned child!"); + } + + if (children->Length() == 0) { + it.Remove(); + } + } +} + +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); + 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"); + + 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_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> >* children = mARIAOwnsHash.Get(curParent); + children->RemoveElement(aChild); + } + + 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; + } + + TreeMutation rmut(curParent); + rmut.BeforeRemoval(aChild, TreeMutation::kNoShutdown); + curParent->RemoveChild(aChild); + rmut.Done(); + + // No insertion point for the child. + if (aIdxInParent == -1) { + return true; + } + + if (aIdxInParent > static_cast<int32_t>(aNewParent->ChildCount())) { + MOZ_ASSERT_UNREACHABLE("Wrong insertion point for a moving child"); + 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); + + uint32_t count = aRoot->ContentChildCount(); + for (uint32_t idx = 0; idx < count; idx++) { + Accessible* child = aRoot->ContentChildAt(idx); + + // 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); +} |