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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_a11y_DocAccessible_h__
+#define mozilla_a11y_DocAccessible_h__
+
+#include "nsIAccessiblePivot.h"
+
+#include "HyperTextAccessibleWrap.h"
+#include "AccEvent.h"
+
+#include "nsClassHashtable.h"
+#include "nsTHashMap.h"
+#include "mozilla/UniquePtr.h"
+#include "nsIDocumentObserver.h"
+#include "nsITimer.h"
+#include "nsTHashSet.h"
+#include "nsWeakReference.h"
+
+class nsAccessiblePivot;
+
+const uint32_t kDefaultCacheLength = 128;
+
+namespace mozilla {
+
+class EditorBase;
+class PresShell;
+
+namespace dom {
+class Document;
+}
+
+namespace a11y {
+
+class DocManager;
+class NotificationController;
+class DocAccessibleChild;
+class RelatedAccIterator;
+template <class Class, class... Args>
+class TNotification;
+
+/**
+ * An accessibility tree node that originated in a content process and
+ * represents a document. Tabs, in-process iframes, and out-of-process iframes
+ * all use this class to represent the doc they contain.
+ */
+class DocAccessible : public HyperTextAccessibleWrap,
+ public nsIDocumentObserver,
+ public nsSupportsWeakReference,
+ public nsIAccessiblePivotObserver {
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DocAccessible, LocalAccessible)
+
+ NS_DECL_NSIACCESSIBLEPIVOTOBSERVER
+
+ protected:
+ typedef mozilla::dom::Document Document;
+
+ public:
+ DocAccessible(Document* aDocument, PresShell* aPresShell);
+
+ // nsIDocumentObserver
+ NS_DECL_NSIDOCUMENTOBSERVER
+
+ // LocalAccessible
+ virtual void Init();
+ virtual void Shutdown() override;
+ virtual nsIFrame* GetFrame() const override;
+ virtual nsINode* GetNode() const override;
+ Document* DocumentNode() const { return mDocumentNode; }
+
+ virtual mozilla::a11y::ENameValueFlag Name(nsString& aName) const override;
+ virtual void Description(nsString& aDescription) const override;
+ virtual Accessible* FocusedChild() override;
+ virtual mozilla::a11y::role NativeRole() const override;
+ virtual uint64_t NativeState() const override;
+ virtual uint64_t NativeInteractiveState() const override;
+ virtual bool NativelyUnavailable() const override;
+ virtual void ApplyARIAState(uint64_t* aState) const override;
+
+ virtual void TakeFocus() const override;
+
+#ifdef A11Y_LOG
+ virtual nsresult HandleAccEvent(AccEvent* aEvent) override;
+#endif
+
+ virtual nsRect RelativeBounds(nsIFrame** aRelativeFrame) const override;
+
+ // ActionAccessible
+ virtual bool HasPrimaryAction() const override;
+ virtual void ActionNameAt(uint8_t aIndex, nsAString& aName) override;
+
+ // HyperTextAccessible
+ virtual already_AddRefed<EditorBase> GetEditor() const override;
+
+ // DocAccessible
+
+ /**
+ * Return document URL.
+ */
+ void URL(nsAString& aURL) const;
+
+ /**
+ * Return DOM document title.
+ */
+ void Title(nsString& aTitle) const;
+
+ /**
+ * Return DOM document mime type.
+ */
+ void MimeType(nsAString& aType) const;
+ /**
+ * Return DOM document type.
+ */
+ void DocType(nsAString& aType) const;
+
+ /**
+ * Adds an entry to mQueuedCacheUpdates indicating aAcc requires
+ * a cache update on domain aNewDomain. If we've already queued an update
+ * for aAcc, aNewDomain is or'd with the existing domain(s)
+ * and the map is updated. Otherwise, the entry is simply inserted.
+ * This function also schedules processing on the controller.
+ * Note that this CANNOT be used for anything which fires events, since events
+ * must be fired after their associated cache update.
+ */
+ void QueueCacheUpdate(LocalAccessible* aAcc, uint64_t aNewDomain);
+
+ /**
+ * Walks the mDependentIDsHashes list for the given accessible and
+ * queues a CacheDomain::Relations cache update fore each related acc.
+ * We call this when we observe an ID mutation or when an acc is bound
+ * to its document.
+ */
+ void QueueCacheUpdateForDependentRelations(LocalAccessible* aAcc);
+
+ /**
+ * Return virtual cursor associated with the document.
+ */
+ nsIAccessiblePivot* VirtualCursor();
+
+ /**
+ * Returns true if the instance has shutdown.
+ */
+ bool HasShutdown() const { return !mPresShell; }
+
+ /**
+ * Return presentation shell for this document accessible.
+ */
+ PresShell* PresShellPtr() const {
+ MOZ_DIAGNOSTIC_ASSERT(!HasShutdown());
+ return mPresShell;
+ }
+
+ /**
+ * Return the presentation shell's context.
+ */
+ nsPresContext* PresContext() const;
+
+ /**
+ * Return true if associated DOM document was loaded and isn't unloading.
+ */
+ bool IsContentLoaded() const;
+
+ bool IsHidden() const;
+
+ void SetViewportCacheDirty(bool aDirty) { mViewportCacheDirty = aDirty; }
+
+ /**
+ * Document load states.
+ */
+ enum LoadState {
+ // initial tree construction is pending
+ eTreeConstructionPending = 0,
+ // initial tree construction done
+ eTreeConstructed = 1,
+ // DOM document is loaded.
+ eDOMLoaded = 1 << 1,
+ // document is ready
+ eReady = eTreeConstructed | eDOMLoaded,
+ // document and all its subdocuments are ready
+ eCompletelyLoaded = eReady | 1 << 2
+ };
+
+ /**
+ * Return true if the document has given document state.
+ */
+ bool HasLoadState(LoadState aState) const {
+ return (mLoadState & static_cast<uint32_t>(aState)) ==
+ static_cast<uint32_t>(aState);
+ }
+
+ /**
+ * Return a native window handler or pointer depending on platform.
+ */
+ virtual void* GetNativeWindow() const;
+
+ /**
+ * Return the parent document.
+ */
+ DocAccessible* ParentDocument() const {
+ return mParent ? mParent->Document() : nullptr;
+ }
+
+ /**
+ * Return the child document count.
+ */
+ uint32_t ChildDocumentCount() const { return mChildDocuments.Length(); }
+
+ /**
+ * Return the child document at the given index.
+ */
+ DocAccessible* GetChildDocumentAt(uint32_t aIndex) const {
+ return mChildDocuments.SafeElementAt(aIndex, nullptr);
+ }
+
+ /**
+ * Fire accessible event asynchronously.
+ */
+ void FireDelayedEvent(AccEvent* aEvent);
+ void FireDelayedEvent(uint32_t aEventType, LocalAccessible* aTarget);
+ void FireEventsOnInsertion(LocalAccessible* aContainer);
+
+ /**
+ * Fire value change event on the given accessible if applicable.
+ */
+ void MaybeNotifyOfValueChange(LocalAccessible* aAccessible);
+
+ /**
+ * Get/set the anchor jump.
+ */
+ LocalAccessible* AnchorJump() {
+ return GetAccessibleOrContainer(mAnchorJumpElm);
+ }
+
+ void SetAnchorJump(nsIContent* aTargetNode) { mAnchorJumpElm = aTargetNode; }
+
+ /**
+ * Bind the child document to the tree.
+ */
+ void BindChildDocument(DocAccessible* aDocument);
+
+ /**
+ * Process the generic notification.
+ *
+ * @note The caller must guarantee that the given instance still exists when
+ * notification is processed.
+ * @see NotificationController::HandleNotification
+ */
+ template <class Class, class... Args>
+ void HandleNotification(
+ Class* aInstance,
+ typename TNotification<Class, Args...>::Callback aMethod, Args*... aArgs);
+
+ /**
+ * Return the cached accessible by the given DOM node if it's in subtree of
+ * this document accessible or the document accessible itself, otherwise null.
+ *
+ * @return the accessible object
+ */
+ LocalAccessible* GetAccessible(nsINode* aNode) const;
+
+ /**
+ * Return an accessible for the given node even if the node is not in
+ * document's node map cache (like HTML area element).
+ *
+ * XXX: it should be really merged with GetAccessible().
+ */
+ LocalAccessible* GetAccessibleEvenIfNotInMap(nsINode* aNode) const;
+ LocalAccessible* GetAccessibleEvenIfNotInMapOrContainer(nsINode* aNode) const;
+
+ /**
+ * Return whether the given DOM node has an accessible or not.
+ */
+ bool HasAccessible(nsINode* aNode) const { return GetAccessible(aNode); }
+
+ /**
+ * Return the cached accessible by the given unique ID within this document.
+ *
+ * @note the unique ID matches with the uniqueID() of Accessible
+ *
+ * @param aUniqueID [in] the unique ID used to cache the node.
+ */
+ LocalAccessible* GetAccessibleByUniqueID(void* aUniqueID) {
+ return UniqueID() == aUniqueID ? this : mAccessibleCache.GetWeak(aUniqueID);
+ }
+
+ /**
+ * Return the cached accessible by the given unique ID looking through
+ * this and nested documents.
+ */
+ LocalAccessible* GetAccessibleByUniqueIDInSubtree(void* aUniqueID);
+
+ /**
+ * Return an accessible for the given DOM node or container accessible if
+ * the node is not accessible. If aNoContainerIfPruned is true it will return
+ * null if the node is in a pruned subtree (eg. aria-hidden or unselected deck
+ * panel)
+ */
+ LocalAccessible* GetAccessibleOrContainer(
+ nsINode* aNode, bool aNoContainerIfPruned = false) const;
+
+ /**
+ * Return a container accessible for the given DOM node.
+ */
+ LocalAccessible* GetContainerAccessible(nsINode* aNode) const;
+
+ /**
+ * Return an accessible for the given node if any, or an immediate accessible
+ * container for it.
+ */
+ LocalAccessible* AccessibleOrTrueContainer(
+ nsINode* aNode, bool aNoContainerIfPruned = false) const;
+
+ /**
+ * Return an accessible for the given node or its first accessible descendant.
+ */
+ LocalAccessible* GetAccessibleOrDescendant(nsINode* aNode) const;
+
+ /**
+ * Returns aria-owns seized child at the given index.
+ */
+ LocalAccessible* ARIAOwnedAt(LocalAccessible* aParent,
+ uint32_t aIndex) const {
+ nsTArray<RefPtr<LocalAccessible>>* children = mARIAOwnsHash.Get(aParent);
+ if (children) {
+ return children->SafeElementAt(aIndex);
+ }
+ return nullptr;
+ }
+ uint32_t ARIAOwnedCount(LocalAccessible* aParent) const {
+ nsTArray<RefPtr<LocalAccessible>>* children = mARIAOwnsHash.Get(aParent);
+ return children ? children->Length() : 0;
+ }
+
+ /**
+ * Return true if the given ID is referred by relation attribute.
+ */
+ bool IsDependentID(dom::Element* aElement, const nsAString& aID) const {
+ return GetRelProviders(aElement, aID);
+ }
+
+ /**
+ * Initialize the newly created accessible and put it into document caches.
+ *
+ * @param aAccessible [in] created accessible
+ * @param aRoleMapEntry [in] the role map entry role the ARIA role or
+ * nullptr if none
+ */
+ void BindToDocument(LocalAccessible* aAccessible,
+ const nsRoleMapEntry* aRoleMapEntry);
+
+ /**
+ * Remove from document and shutdown the given accessible.
+ */
+ void UnbindFromDocument(LocalAccessible* aAccessible);
+
+ /**
+ * Notify the document accessible that content was inserted.
+ */
+ void ContentInserted(nsIContent* aStartChildNode, nsIContent* aEndChildNode);
+
+ /**
+ * @see nsAccessibilityService::ScheduleAccessibilitySubtreeUpdate
+ */
+ void ScheduleTreeUpdate(nsIContent* aContent);
+
+ /**
+ * Update the tree on content removal.
+ */
+ void ContentRemoved(LocalAccessible* aAccessible);
+ void ContentRemoved(nsIContent* aContentNode);
+
+ /**
+ * Updates accessible tree when rendered text is changed.
+ */
+ void UpdateText(nsIContent* aTextNode);
+
+ /**
+ * Recreate an accessible, results in hide/show events pair.
+ */
+ void RecreateAccessible(nsIContent* aContent);
+
+ /**
+ * Schedule ARIA owned element relocation if needed. Return true if relocation
+ * was scheduled.
+ */
+ bool RelocateARIAOwnedIfNeeded(nsIContent* aEl);
+
+ /**
+ * Return a notification controller associated with the document.
+ */
+ NotificationController* Controller() const { return mNotificationController; }
+
+ /**
+ * If this document is in a content process return the object responsible for
+ * communicating with the main process for it.
+ */
+ DocAccessibleChild* IPCDoc() const { return mIPCDoc; }
+
+ /**
+ * Notify the document that a DOM node has been scrolled. document will
+ * dispatch throttled accessibility events for scrolling, and a scroll-end
+ * event. This function also queues a cache update for ScrollPosition.
+ */
+ void HandleScroll(nsINode* aTarget);
+
+ /**
+ * Retrieves the scroll frame (if it exists) for the given accessible
+ * and returns its scroll position and scroll range. If the given
+ * accessible is `this`, return the scroll position and range of
+ * the root scroll frame. Return values have been scaled by the
+ * PresShell's resolution.
+ */
+ std::pair<nsPoint, nsRect> ComputeScrollData(LocalAccessible* aAcc);
+
+ protected:
+ virtual ~DocAccessible();
+
+ void LastRelease();
+
+ // DocAccessible
+ virtual nsresult AddEventListeners();
+ virtual nsresult RemoveEventListeners();
+
+ /**
+ * Marks this document as loaded or loading.
+ */
+ void NotifyOfLoad(uint32_t aLoadEventType);
+ void NotifyOfLoading(bool aIsReloading);
+
+ friend class DocManager;
+
+ /**
+ * Perform initial update (create accessible tree).
+ * Can be overridden by wrappers to prepare initialization work.
+ */
+ virtual void DoInitialUpdate();
+
+ /**
+ * Updates root element and picks up ARIA role on it if any.
+ */
+ void UpdateRootElIfNeeded();
+
+ /**
+ * Process document load notification, fire document load and state busy
+ * events if applicable.
+ */
+ void ProcessLoad();
+
+ /**
+ * Append the given document accessible to this document's child document
+ * accessibles.
+ */
+ bool AppendChildDocument(DocAccessible* aChildDocument) {
+ // XXX(Bug 1631371) Check if this should use a fallible operation as it
+ // pretended earlier, or change the return type to void.
+ mChildDocuments.AppendElement(aChildDocument);
+ return true;
+ }
+
+ /**
+ * Remove the given document accessible from this document's child document
+ * accessibles.
+ */
+ void RemoveChildDocument(DocAccessible* aChildDocument) {
+ mChildDocuments.RemoveElement(aChildDocument);
+ }
+
+ /**
+ * Add dependent IDs pointed by accessible element by relation attribute to
+ * cache. If the relation attribute is missed then all relation attributes
+ * are checked.
+ *
+ * @param aRelProvider [in] accessible that element has relation attribute
+ * @param aRelAttr [in, optional] relation attribute
+ */
+ void AddDependentIDsFor(LocalAccessible* aRelProvider,
+ nsAtom* aRelAttr = nullptr);
+
+ /**
+ * Remove dependent IDs pointed by accessible element by relation attribute
+ * from cache. If the relation attribute is absent then all relation
+ * attributes are checked.
+ *
+ * @param aRelProvider [in] accessible that element has relation attribute
+ * @param aRelAttr [in, optional] relation attribute
+ */
+ void RemoveDependentIDsFor(LocalAccessible* aRelProvider,
+ nsAtom* aRelAttr = nullptr);
+
+ /**
+ * Update or recreate an accessible depending on a changed attribute.
+ *
+ * @param aElement [in] the element the attribute was changed on
+ * @param aAttribute [in] the changed attribute
+ * @return true if an action was taken on the attribute change
+ */
+ bool UpdateAccessibleOnAttrChange(mozilla::dom::Element* aElement,
+ nsAtom* aAttribute);
+
+ /**
+ * Process ARIA active-descendant attribute change.
+ */
+ void ARIAActiveDescendantChanged(LocalAccessible* aAccessible);
+
+ /**
+ * Update the accessible tree for inserted content.
+ */
+ void ProcessContentInserted(
+ LocalAccessible* aContainer,
+ const nsTArray<nsCOMPtr<nsIContent>>* aInsertedContent);
+ void ProcessContentInserted(LocalAccessible* aContainer,
+ nsIContent* aInsertedContent);
+
+ /**
+ * Used to notify the document to make it process the invalidation list.
+ *
+ * While children are cached we may encounter the case there's no accessible
+ * for referred content by related accessible. Store these related nodes to
+ * invalidate their containers later.
+ */
+ void ProcessInvalidationList();
+
+ /**
+ * Process mPendingUpdates
+ */
+ void ProcessPendingUpdates();
+
+ /**
+ * Called from NotificationController to process this doc's
+ * mQueuedCacheUpdates list. For each acc in the map, this function
+ * sends a cache update with its corresponding CacheDomain.
+ */
+ void ProcessQueuedCacheUpdates();
+
+ /**
+ * Only works in content process documents.
+ */
+ bool IsAccessibleBeingMoved(LocalAccessible* aAcc) {
+ return mMovedAccessibles.Contains(aAcc);
+ }
+
+ /**
+ * Called from NotificationController before mutation events are processed to
+ * notify the parent process which Accessibles are being moved (if any).
+ */
+ void SendAccessiblesWillMove();
+
+ /**
+ * Called from NotificationController after all mutation events have been
+ * processed to clear our data about mutations during this tick.
+ */
+ void ClearMutationData() {
+ mMovedAccessibles.Clear();
+ mInsertedAccessibles.Clear();
+ mRemovedNodes.Clear();
+ }
+
+ /**
+ * Steals or puts back accessible subtrees.
+ */
+ void DoARIAOwnsRelocation(LocalAccessible* aOwner);
+
+ /**
+ * Moves children back under their original parents.
+ */
+ void PutChildrenBack(nsTArray<RefPtr<LocalAccessible>>* aChildren,
+ uint32_t aStartIdx);
+
+ bool MoveChild(LocalAccessible* aChild, LocalAccessible* aNewParent,
+ int32_t aIdxInParent);
+
+ /**
+ * Create accessible tree.
+ *
+ * @param aRoot [in] a root of subtree to create
+ * @param aFocusedAcc [in, optional] a focused accessible under created
+ * subtree if any
+ */
+ void CacheChildrenInSubtree(LocalAccessible* aRoot,
+ LocalAccessible** aFocusedAcc = nullptr);
+ void CreateSubtree(LocalAccessible* aRoot);
+
+ /**
+ * Remove accessibles in subtree from node to accessible map.
+ */
+ void UncacheChildrenInSubtree(LocalAccessible* aRoot);
+
+ /**
+ * Shutdown any cached accessible in the subtree.
+ *
+ * @param aAccessible [in] the root of the subrtee to invalidate accessible
+ * child/parent refs in
+ */
+ void ShutdownChildrenInSubtree(LocalAccessible* aAccessible);
+
+ /**
+ * Return true if the document is a target of document loading events
+ * (for example, state busy change or document reload events).
+ *
+ * Rules: The root chrome document accessible is never an event target
+ * (for example, Firefox UI window). If the sub document is loaded within its
+ * parent document then the parent document is a target only (aka events
+ * coalescence).
+ */
+ bool IsLoadEventTarget() const;
+
+ /*
+ * Set the object responsible for communicating with the main process on
+ * behalf of this document.
+ */
+ void SetIPCDoc(DocAccessibleChild* aIPCDoc);
+
+ friend class DocAccessibleChildBase;
+
+ /**
+ * Used to fire scrolling end event after page scroll.
+ *
+ * @param aTimer [in] the timer object
+ * @param aClosure [in] the document accessible where scrolling happens
+ */
+ static void ScrollTimerCallback(nsITimer* aTimer, void* aClosure);
+
+ void DispatchScrollingEvent(nsINode* aTarget, uint32_t aEventType);
+
+ /**
+ * Check if an id attribute change affects aria-activedescendant and handle
+ * the aria-activedescendant change if appropriate.
+ * If the currently focused element has aria-activedescendant and an
+ * element's id changes to match this, the id was probably moved from the
+ * previous active descendant, thus making this element the new active
+ * descendant. In that case, accessible focus must be changed accordingly.
+ */
+ void ARIAActiveDescendantIDMaybeMoved(LocalAccessible* aAccessible);
+
+ /**
+ * Traverse content subtree and for each node do one of 3 things:
+ * 1. Check if content node has an accessible that should be removed and
+ * remove it.
+ * 2. Check if content node has an accessible that needs to be recreated.
+ * Remove it and schedule it for reinsertion.
+ * 3. Check if content node has no accessible but needs one. Schedule one for
+ * insertion.
+ *
+ * Returns true if the root node should be reinserted.
+ */
+ bool PruneOrInsertSubtree(nsIContent* aRoot);
+
+ protected:
+ /**
+ * State and property flags, kept by mDocFlags.
+ */
+ enum {
+ // Whether the document is a top level content document in this process.
+ eTopLevelContentDocInProcess = 1 << 0
+ };
+
+ /**
+ * Cache of accessibles within this document accessible.
+ */
+ AccessibleHashtable mAccessibleCache;
+ nsTHashMap<nsPtrHashKey<const nsINode>, LocalAccessible*>
+ mNodeToAccessibleMap;
+
+ Document* mDocumentNode;
+ nsCOMPtr<nsITimer> mScrollWatchTimer;
+ nsTHashMap<nsPtrHashKey<nsINode>, TimeStamp> mLastScrollingDispatch;
+
+ /**
+ * Bit mask of document load states (@see LoadState).
+ */
+ uint32_t mLoadState : 3;
+
+ /**
+ * Bit mask of other states and props.
+ */
+ uint32_t mDocFlags : 27;
+
+ /**
+ * Tracks whether we have seen changes to this document's content that
+ * indicate we should re-send the viewport cache we use for hittesting.
+ * This value is set in `BundleFieldsForCache` and processed in
+ * `ProcessQueuedCacheUpdates`.
+ */
+ bool mViewportCacheDirty : 1;
+
+ /**
+ * Type of document load event fired after the document is loaded completely.
+ */
+ uint32_t mLoadEventType;
+
+ /**
+ * Reference to anchor jump element.
+ */
+ nsCOMPtr<nsIContent> mAnchorJumpElm;
+
+ /**
+ * A generic state (see items below) before the attribute value was changed.
+ * @see AttributeWillChange and AttributeChanged notifications.
+ */
+
+ // Previous state bits before attribute change
+ uint64_t mPrevStateBits;
+
+ nsTArray<RefPtr<DocAccessible>> mChildDocuments;
+
+ /**
+ * The virtual cursor of the document.
+ */
+ RefPtr<nsAccessiblePivot> mVirtualCursor;
+
+ /**
+ * A storage class for pairing content with one of its relation attributes.
+ */
+ class AttrRelProvider {
+ public:
+ AttrRelProvider(nsAtom* aRelAttr, nsIContent* aContent)
+ : mRelAttr(aRelAttr), mContent(aContent) {}
+
+ nsAtom* mRelAttr;
+ nsCOMPtr<nsIContent> mContent;
+
+ private:
+ AttrRelProvider();
+ AttrRelProvider(const AttrRelProvider&);
+ AttrRelProvider& operator=(const AttrRelProvider&);
+ };
+
+ typedef nsTArray<mozilla::UniquePtr<AttrRelProvider>> AttrRelProviders;
+ typedef nsClassHashtable<nsStringHashKey, AttrRelProviders>
+ DependentIDsHashtable;
+
+ /**
+ * Returns/creates/removes attribute relation providers associated with
+ * a DOM document if the element is in uncomposed document or associated
+ * with shadow DOM the element is in.
+ */
+ AttrRelProviders* GetRelProviders(dom::Element* aElement,
+ const nsAString& aID) const;
+ AttrRelProviders* GetOrCreateRelProviders(dom::Element* aElement,
+ const nsAString& aID);
+ void RemoveRelProvidersIfEmpty(dom::Element* aElement, const nsAString& aID);
+
+ /**
+ * The cache of IDs pointed by relation attributes.
+ */
+ nsClassHashtable<nsPtrHashKey<dom::DocumentOrShadowRoot>,
+ DependentIDsHashtable>
+ mDependentIDsHashes;
+
+ friend class RelatedAccIterator;
+
+ /**
+ * Used for our caching algorithm. We store the list of nodes that should be
+ * invalidated.
+ *
+ * @see ProcessInvalidationList
+ */
+ nsTArray<RefPtr<nsIContent>> mInvalidationList;
+
+ /**
+ * Holds a list of aria-owns relocations.
+ */
+ nsClassHashtable<nsPtrHashKey<LocalAccessible>,
+ nsTArray<RefPtr<LocalAccessible>>>
+ mARIAOwnsHash;
+
+ /**
+ * Keeps a list of pending subtrees to update post-refresh.
+ */
+ nsTArray<RefPtr<nsIContent>> mPendingUpdates;
+
+ /**
+ * Used to process notification from core and accessible events.
+ */
+ RefPtr<NotificationController> mNotificationController;
+ friend class EventTree;
+ friend class NotificationController;
+
+ private:
+ void SetRoleMapEntryForDoc(dom::Element* aElement);
+
+ /**
+ * This must be called whenever an Accessible is moved in a content process.
+ * It keeps track of Accessibles moved during this tick.
+ */
+ void TrackMovedAccessible(LocalAccessible* aAcc);
+
+ /**
+ * For hidden subtrees, fire a name/description change event if the subtree
+ * is a target of aria-labelledby/describedby.
+ * This does nothing if it is called on a node which is not part of a hidden
+ * aria-labelledby/describedby target.
+ */
+ void MaybeHandleChangeToHiddenNameOrDescription(nsIContent* aChild);
+
+ PresShell* mPresShell;
+
+ // Exclusively owned by IPDL so don't manually delete it!
+ DocAccessibleChild* mIPCDoc;
+
+ // A hash map between LocalAccessibles and CacheDomains, tracking
+ // cache updates that have been queued during the current tick
+ // but not yet sent. It is possible for this map to contain a reference
+ // to the document it lives on. We clear the list in Shutdown() to
+ // avoid cyclical references.
+ nsTHashMap<RefPtr<LocalAccessible>, uint64_t> mQueuedCacheUpdates;
+
+ // A set of Accessibles moved during this tick. Only used in content
+ // processes.
+ nsTHashSet<RefPtr<LocalAccessible>> mMovedAccessibles;
+ // A set of Accessibles inserted during this tick. Only used in content
+ // processes. This is needed to prevent insertions + moves of the same
+ // Accessible in the same tick from being tracked as moves.
+ nsTHashSet<RefPtr<LocalAccessible>> mInsertedAccessibles;
+ // A set of DOM nodes removed during this tick. This avoids a lot of pointless
+ // recursive DOM traversals.
+ nsTHashSet<nsIContent*> mRemovedNodes;
+};
+
+inline DocAccessible* LocalAccessible::AsDoc() {
+ return IsDoc() ? static_cast<DocAccessible*>(this) : nullptr;
+}
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif