зеркало из https://github.com/mozilla/gecko-dev.git
2689 строки
90 KiB
C++
2689 строки
90 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "LocalAccessible-inl.h"
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#include "AccIterator.h"
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#include "AccAttributes.h"
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#include "CachedTableAccessible.h"
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#include "DocAccessible-inl.h"
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#include "DocAccessibleChild.h"
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#include "HTMLImageMapAccessible.h"
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#include "nsAccCache.h"
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#include "nsAccessiblePivot.h"
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#include "nsAccUtils.h"
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#include "nsDeckFrame.h"
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#include "nsEventShell.h"
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#include "nsLayoutUtils.h"
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#include "nsTextEquivUtils.h"
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#include "Pivot.h"
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#include "Role.h"
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#include "RootAccessible.h"
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#include "TreeWalker.h"
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#include "xpcAccessibleDocument.h"
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#include "nsCommandManager.h"
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#include "nsContentUtils.h"
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#include "nsIDocShell.h"
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#include "mozilla/dom/Document.h"
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#include "nsPIDOMWindow.h"
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#include "nsIContentInlines.h"
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#include "nsIEditingSession.h"
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#include "nsIFrame.h"
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#include "nsIInterfaceRequestorUtils.h"
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#include "nsImageFrame.h"
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#include "nsViewManager.h"
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#include "nsIScrollableFrame.h"
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#include "nsUnicharUtils.h"
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#include "nsIURI.h"
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#include "nsIWebNavigation.h"
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#include "nsFocusManager.h"
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#include "nsTHashSet.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/EditorBase.h"
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#include "mozilla/HTMLEditor.h"
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#include "mozilla/PresShell.h"
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#include "mozilla/StaticPrefs_accessibility.h"
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#include "mozilla/dom/AncestorIterator.h"
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#include "mozilla/dom/BrowserChild.h"
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#include "mozilla/dom/DocumentType.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/HTMLSelectElement.h"
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#include "mozilla/dom/MutationEventBinding.h"
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#include "mozilla/dom/UserActivation.h"
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using namespace mozilla;
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using namespace mozilla::a11y;
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////////////////////////////////////////////////////////////////////////////////
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// Static member initialization
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static nsStaticAtom* const kRelationAttrs[] = {nsGkAtoms::aria_labelledby,
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nsGkAtoms::aria_describedby,
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nsGkAtoms::aria_details,
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nsGkAtoms::aria_owns,
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nsGkAtoms::aria_controls,
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nsGkAtoms::aria_flowto,
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nsGkAtoms::aria_errormessage,
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nsGkAtoms::_for,
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nsGkAtoms::control};
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static const uint32_t kRelationAttrsLen = ArrayLength(kRelationAttrs);
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////////////////////////////////////////////////////////////////////////////////
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// Constructor/desctructor
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DocAccessible::DocAccessible(dom::Document* aDocument,
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PresShell* aPresShell)
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: // XXX don't pass a document to the LocalAccessible constructor so that
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// we don't set mDoc until our vtable is fully setup. If we set mDoc
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// before setting up the vtable we will call LocalAccessible::AddRef()
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// but not the overrides of it for subclasses. It is important to call
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// those overrides to avoid confusing leak checking machinary.
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HyperTextAccessibleWrap(nullptr, nullptr),
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// XXX aaronl should we use an algorithm for the initial cache size?
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mAccessibleCache(kDefaultCacheLength),
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mNodeToAccessibleMap(kDefaultCacheLength),
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mDocumentNode(aDocument),
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mLoadState(eTreeConstructionPending),
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mDocFlags(0),
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mViewportCacheDirty(false),
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mLoadEventType(0),
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mPrevStateBits(0),
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mVirtualCursor(nullptr),
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mPresShell(aPresShell),
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mIPCDoc(nullptr) {
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mGenericTypes |= eDocument;
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mStateFlags |= eNotNodeMapEntry;
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mDoc = this;
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MOZ_ASSERT(mPresShell, "should have been given a pres shell");
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mPresShell->SetDocAccessible(this);
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}
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DocAccessible::~DocAccessible() {
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NS_ASSERTION(!mPresShell, "LastRelease was never called!?!");
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}
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////////////////////////////////////////////////////////////////////////////////
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// nsISupports
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NS_IMPL_CYCLE_COLLECTION_CLASS(DocAccessible)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(DocAccessible,
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LocalAccessible)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mNotificationController)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mVirtualCursor)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mChildDocuments)
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for (const auto& hashEntry : tmp->mDependentIDsHashes.Values()) {
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for (const auto& providers : hashEntry->Values()) {
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for (int32_t provIdx = providers->Length() - 1; provIdx >= 0; provIdx--) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(
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cb, "content of dependent ids hash entry of document accessible");
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const auto& provider = (*providers)[provIdx];
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cb.NoteXPCOMChild(provider->mContent);
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}
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}
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAccessibleCache)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAnchorJumpElm)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInvalidationList)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPendingUpdates)
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for (const auto& ar : tmp->mARIAOwnsHash.Values()) {
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for (uint32_t i = 0; i < ar->Length(); i++) {
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NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mARIAOwnsHash entry item");
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cb.NoteXPCOMChild(ar->ElementAt(i));
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}
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(DocAccessible, LocalAccessible)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mNotificationController)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mVirtualCursor)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mChildDocuments)
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tmp->mDependentIDsHashes.Clear();
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tmp->mNodeToAccessibleMap.Clear();
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mAccessibleCache)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mAnchorJumpElm)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mInvalidationList)
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mPendingUpdates)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
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tmp->mARIAOwnsHash.Clear();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DocAccessible)
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NS_INTERFACE_MAP_ENTRY(nsIDocumentObserver)
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NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
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NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
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NS_INTERFACE_MAP_ENTRY(nsIAccessiblePivotObserver)
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NS_INTERFACE_MAP_END_INHERITING(HyperTextAccessible)
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NS_IMPL_ADDREF_INHERITED(DocAccessible, HyperTextAccessible)
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NS_IMPL_RELEASE_INHERITED(DocAccessible, HyperTextAccessible)
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////////////////////////////////////////////////////////////////////////////////
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// nsIAccessible
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ENameValueFlag DocAccessible::Name(nsString& aName) const {
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aName.Truncate();
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if (mParent) {
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mParent->Name(aName); // Allow owning iframe to override the name
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}
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if (aName.IsEmpty()) {
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// Allow name via aria-labelledby or title attribute
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LocalAccessible::Name(aName);
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}
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if (aName.IsEmpty()) {
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Title(aName); // Try title element
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}
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if (aName.IsEmpty()) { // Last resort: use URL
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URL(aName);
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}
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return eNameOK;
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}
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// LocalAccessible public method
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role DocAccessible::NativeRole() const {
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nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(mDocumentNode);
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if (docShell) {
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nsCOMPtr<nsIDocShellTreeItem> sameTypeRoot;
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docShell->GetInProcessSameTypeRootTreeItem(getter_AddRefs(sameTypeRoot));
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int32_t itemType = docShell->ItemType();
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if (sameTypeRoot == docShell) {
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// Root of content or chrome tree
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if (itemType == nsIDocShellTreeItem::typeChrome) {
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return roles::CHROME_WINDOW;
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}
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if (itemType == nsIDocShellTreeItem::typeContent) {
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return roles::DOCUMENT;
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}
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} else if (itemType == nsIDocShellTreeItem::typeContent) {
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return roles::DOCUMENT;
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}
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}
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return roles::PANE; // Fall back;
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}
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void DocAccessible::Description(nsString& aDescription) const {
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if (mParent) mParent->Description(aDescription);
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if (HasOwnContent() && aDescription.IsEmpty()) {
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nsTextEquivUtils::GetTextEquivFromIDRefs(this, nsGkAtoms::aria_describedby,
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aDescription);
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}
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}
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// LocalAccessible public method
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uint64_t DocAccessible::NativeState() const {
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// Document is always focusable.
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uint64_t state =
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states::FOCUSABLE; // keep in sync with NativeInteractiveState() impl
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if (FocusMgr()->IsFocused(this)) state |= states::FOCUSED;
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// Expose stale state until the document is ready (DOM is loaded and tree is
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// constructed).
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if (!HasLoadState(eReady)) state |= states::STALE;
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// Expose state busy until the document and all its subdocuments is completely
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// loaded.
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if (!HasLoadState(eCompletelyLoaded)) state |= states::BUSY;
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nsIFrame* frame = GetFrame();
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if (!frame || !frame->IsVisibleConsideringAncestors(
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nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY)) {
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state |= states::INVISIBLE | states::OFFSCREEN;
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}
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RefPtr<EditorBase> editorBase = GetEditor();
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state |= editorBase ? states::EDITABLE : states::READONLY;
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return state;
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}
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uint64_t DocAccessible::NativeInteractiveState() const {
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// Document is always focusable.
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return states::FOCUSABLE;
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}
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bool DocAccessible::NativelyUnavailable() const { return false; }
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// LocalAccessible public method
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void DocAccessible::ApplyARIAState(uint64_t* aState) const {
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// Grab states from content element.
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if (mContent) LocalAccessible::ApplyARIAState(aState);
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// Allow iframe/frame etc. to have final state override via ARIA.
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if (mParent) mParent->ApplyARIAState(aState);
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}
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LocalAccessible* DocAccessible::FocusedChild() {
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// Return an accessible for the current global focus, which does not have to
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// be contained within the current document.
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return FocusMgr()->FocusedAccessible();
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}
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void DocAccessible::TakeFocus() const {
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// Focus the document.
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nsFocusManager* fm = nsFocusManager::GetFocusManager();
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RefPtr<dom::Element> newFocus;
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dom::AutoHandlingUserInputStatePusher inputStatePusher(true);
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fm->MoveFocus(mDocumentNode->GetWindow(), nullptr,
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nsFocusManager::MOVEFOCUS_ROOT, 0, getter_AddRefs(newFocus));
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}
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// HyperTextAccessible method
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already_AddRefed<EditorBase> DocAccessible::GetEditor() const {
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// Check if document is editable (designMode="on" case). Otherwise check if
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// the html:body (for HTML document case) or document element is editable.
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if (!mDocumentNode->IsInDesignMode() &&
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(!mContent || !mContent->HasFlag(NODE_IS_EDITABLE))) {
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return nullptr;
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}
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nsCOMPtr<nsIDocShell> docShell = mDocumentNode->GetDocShell();
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if (!docShell) {
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return nullptr;
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}
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nsCOMPtr<nsIEditingSession> editingSession;
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docShell->GetEditingSession(getter_AddRefs(editingSession));
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if (!editingSession) return nullptr; // No editing session interface
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RefPtr<HTMLEditor> htmlEditor =
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editingSession->GetHTMLEditorForWindow(mDocumentNode->GetWindow());
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if (!htmlEditor) {
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return nullptr;
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}
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bool isEditable = false;
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htmlEditor->GetIsDocumentEditable(&isEditable);
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if (isEditable) {
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return htmlEditor.forget();
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}
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return nullptr;
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}
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// DocAccessible public method
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void DocAccessible::URL(nsAString& aURL) const {
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nsCOMPtr<nsISupports> container = mDocumentNode->GetContainer();
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nsCOMPtr<nsIWebNavigation> webNav(do_GetInterface(container));
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nsAutoCString theURL;
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if (webNav) {
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nsCOMPtr<nsIURI> pURI;
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webNav->GetCurrentURI(getter_AddRefs(pURI));
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if (pURI) pURI->GetSpec(theURL);
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}
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CopyUTF8toUTF16(theURL, aURL);
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}
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void DocAccessible::Title(nsString& aTitle) const {
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mDocumentNode->GetTitle(aTitle);
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}
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void DocAccessible::MimeType(nsAString& aType) const {
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mDocumentNode->GetContentType(aType);
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}
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void DocAccessible::DocType(nsAString& aType) const {
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dom::DocumentType* docType = mDocumentNode->GetDoctype();
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if (docType) docType->GetPublicId(aType);
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}
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void DocAccessible::QueueCacheUpdate(LocalAccessible* aAcc,
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uint64_t aNewDomain) {
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if (!mIPCDoc || !StaticPrefs::accessibility_cache_enabled_AtStartup()) {
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return;
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}
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uint64_t& domain = mQueuedCacheUpdates.LookupOrInsert(aAcc, 0);
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domain |= aNewDomain;
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Controller()->ScheduleProcessing();
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}
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////////////////////////////////////////////////////////////////////////////////
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// LocalAccessible
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void DocAccessible::Init() {
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#ifdef A11Y_LOG
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if (logging::IsEnabled(logging::eDocCreate)) {
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logging::DocCreate("document initialize", mDocumentNode, this);
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}
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#endif
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// Initialize notification controller.
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mNotificationController = new NotificationController(this, mPresShell);
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// Mark the DocAccessible as loaded if its DOM document is already loaded at
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// this point. This can happen for one of three reasons:
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// 1. A11y was started late.
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// 2. DOM loading for a document (probably an in-process iframe) completed
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// before its Accessible container was created.
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// 3. The PresShell for the document was created after DOM loading completed.
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// In that case, we tried to create the DocAccessible when DOM loading
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// completed, but we can't create a DocAccessible without a PresShell, so
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// this failed. The DocAccessible was subsequently created due to a layout
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// notification.
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if (mDocumentNode->GetReadyStateEnum() ==
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dom::Document::READYSTATE_COMPLETE) {
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mLoadState |= eDOMLoaded;
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// If this happened due to reasons 1 or 2, it isn't *necessary* to fire a
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// doc load complete event. If it happened due to reason 3, we need to fire
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// doc load complete because clients (especially tests) might be waiting
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// for the document to load using this event. We can't distinguish why this
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// happened at this point, so just fire it regardless. It won't do any
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// harm even if it isn't necessary. We set mLoadEventType here and it will
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// be fired in ProcessLoad as usual.
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mLoadEventType = nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE;
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} else if (mDocumentNode->IsInitialDocument()) {
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// The initial about:blank document will never finish loading, so we can
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// immediately mark it loaded to avoid waiting for its load.
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mLoadState |= eDOMLoaded;
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}
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AddEventListeners();
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}
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void DocAccessible::Shutdown() {
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if (!mPresShell) { // already shutdown
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return;
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}
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#ifdef A11Y_LOG
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if (logging::IsEnabled(logging::eDocDestroy)) {
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logging::DocDestroy("document shutdown", mDocumentNode, this);
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}
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#endif
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// Mark the document as shutdown before AT is notified about the document
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// removal from its container (valid for root documents on ATK and due to
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// some reason for MSAA, refer to bug 757392 for details).
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mStateFlags |= eIsDefunct;
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if (mNotificationController) {
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mNotificationController->Shutdown();
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mNotificationController = nullptr;
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}
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RemoveEventListeners();
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// mParent->RemoveChild clears mParent, but we need to know whether we were a
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// child later, so use a flag.
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const bool isChild = !!mParent;
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if (mParent) {
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DocAccessible* parentDocument = mParent->Document();
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if (parentDocument) parentDocument->RemoveChildDocument(this);
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mParent->RemoveChild(this);
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MOZ_ASSERT(!mParent, "Parent has to be null!");
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}
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mPresShell->SetDocAccessible(nullptr);
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mPresShell = nullptr; // Avoid reentrancy
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// Walk the array backwards because child documents remove themselves from the
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// array as they are shutdown.
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int32_t childDocCount = mChildDocuments.Length();
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for (int32_t idx = childDocCount - 1; idx >= 0; idx--) {
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mChildDocuments[idx]->Shutdown();
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}
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mChildDocuments.Clear();
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// mQueuedCacheUpdates can contain a reference to this document (ex. if the
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// doc is scrollable and we're sending a scroll position update). Clear the
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// map here to avoid creating ref cycles.
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mQueuedCacheUpdates.Clear();
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// XXX thinking about ordering?
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if (mIPCDoc) {
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MOZ_ASSERT(IPCAccessibilityActive());
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mIPCDoc->Shutdown();
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MOZ_ASSERT(!mIPCDoc);
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}
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if (mVirtualCursor) {
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mVirtualCursor->RemoveObserver(this);
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mVirtualCursor = nullptr;
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}
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mDependentIDsHashes.Clear();
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mNodeToAccessibleMap.Clear();
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mAnchorJumpElm = nullptr;
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mInvalidationList.Clear();
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mPendingUpdates.Clear();
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for (auto iter = mAccessibleCache.Iter(); !iter.Done(); iter.Next()) {
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LocalAccessible* accessible = iter.Data();
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MOZ_ASSERT(accessible);
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if (accessible && !accessible->IsDefunct()) {
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// Unlink parent to avoid its cleaning overhead in shutdown.
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accessible->mParent = nullptr;
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accessible->Shutdown();
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}
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iter.Remove();
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}
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HyperTextAccessibleWrap::Shutdown();
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MOZ_ASSERT(GetAccService());
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GetAccService()->NotifyOfDocumentShutdown(
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this, mDocumentNode,
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// Make sure we don't shut down AccService while a parent document is
|
|
// still shutting down. The parent will allow service shutdown when it
|
|
// reaches this point.
|
|
/* aAllowServiceShutdown */ !isChild);
|
|
mDocumentNode = nullptr;
|
|
}
|
|
|
|
nsIFrame* DocAccessible::GetFrame() const {
|
|
nsIFrame* root = nullptr;
|
|
if (mPresShell) {
|
|
root = mPresShell->GetRootFrame();
|
|
}
|
|
|
|
return root;
|
|
}
|
|
|
|
nsINode* DocAccessible::GetNode() const { return mDocumentNode; }
|
|
|
|
// DocAccessible protected member
|
|
nsRect DocAccessible::RelativeBounds(nsIFrame** aRelativeFrame) const {
|
|
*aRelativeFrame = GetFrame();
|
|
|
|
dom::Document* document = mDocumentNode;
|
|
dom::Document* parentDoc = nullptr;
|
|
|
|
nsRect bounds;
|
|
while (document) {
|
|
PresShell* presShell = document->GetPresShell();
|
|
if (!presShell) {
|
|
return nsRect();
|
|
}
|
|
|
|
nsRect scrollPort;
|
|
nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollable();
|
|
if (sf) {
|
|
scrollPort = sf->GetScrollPortRect();
|
|
} else {
|
|
nsIFrame* rootFrame = presShell->GetRootFrame();
|
|
if (!rootFrame) return nsRect();
|
|
|
|
scrollPort = rootFrame->GetRect();
|
|
}
|
|
|
|
if (parentDoc) { // After first time thru loop
|
|
// XXXroc bogus code! scrollPort is relative to the viewport of
|
|
// this document, but we're intersecting rectangles derived from
|
|
// multiple documents and assuming they're all in the same coordinate
|
|
// system. See bug 514117.
|
|
bounds.IntersectRect(scrollPort, bounds);
|
|
} else { // First time through loop
|
|
bounds = scrollPort;
|
|
}
|
|
|
|
document = parentDoc = document->GetInProcessParentDocument();
|
|
}
|
|
|
|
return bounds;
|
|
}
|
|
|
|
// DocAccessible protected member
|
|
nsresult DocAccessible::AddEventListeners() {
|
|
SelectionMgr()->AddDocSelectionListener(mPresShell);
|
|
|
|
// Add document observer.
|
|
mDocumentNode->AddObserver(this);
|
|
return NS_OK;
|
|
}
|
|
|
|
// DocAccessible protected member
|
|
nsresult DocAccessible::RemoveEventListeners() {
|
|
// Remove listeners associated with content documents
|
|
NS_ASSERTION(mDocumentNode, "No document during removal of listeners.");
|
|
|
|
if (mDocumentNode) {
|
|
mDocumentNode->RemoveObserver(this);
|
|
}
|
|
|
|
if (mScrollWatchTimer) {
|
|
mScrollWatchTimer->Cancel();
|
|
mScrollWatchTimer = nullptr;
|
|
NS_RELEASE_THIS(); // Kung fu death grip
|
|
}
|
|
|
|
SelectionMgr()->RemoveDocSelectionListener(mPresShell);
|
|
return NS_OK;
|
|
}
|
|
|
|
void DocAccessible::ScrollTimerCallback(nsITimer* aTimer, void* aClosure) {
|
|
DocAccessible* docAcc = reinterpret_cast<DocAccessible*>(aClosure);
|
|
|
|
if (docAcc) {
|
|
// Dispatch a scroll-end for all entries in table. They have not
|
|
// been scrolled in at least `kScrollEventInterval`.
|
|
for (auto iter = docAcc->mLastScrollingDispatch.Iter(); !iter.Done();
|
|
iter.Next()) {
|
|
docAcc->DispatchScrollingEvent(iter.Key(),
|
|
nsIAccessibleEvent::EVENT_SCROLLING_END);
|
|
iter.Remove();
|
|
}
|
|
|
|
if (docAcc->mScrollWatchTimer) {
|
|
docAcc->mScrollWatchTimer = nullptr;
|
|
NS_RELEASE(docAcc); // Release kung fu death grip
|
|
}
|
|
}
|
|
}
|
|
|
|
void DocAccessible::HandleScroll(nsINode* aTarget) {
|
|
// Regardless of our scroll timer, we need to send a cache update
|
|
// to ensure the next Bounds() query accurately reflects our position
|
|
// after scrolling.
|
|
if (LocalAccessible* scrollTarget = GetAccessible(aTarget)) {
|
|
QueueCacheUpdate(scrollTarget, CacheDomain::ScrollPosition);
|
|
}
|
|
|
|
const uint32_t kScrollEventInterval = 100;
|
|
// If we haven't dispatched a scrolling event for a target in at least
|
|
// kScrollEventInterval milliseconds, dispatch one now.
|
|
mLastScrollingDispatch.WithEntryHandle(aTarget, [&](auto&& lastDispatch) {
|
|
const TimeStamp now = TimeStamp::Now();
|
|
|
|
if (!lastDispatch ||
|
|
(now - lastDispatch.Data()).ToMilliseconds() >= kScrollEventInterval) {
|
|
// We can't fire events on a document whose tree isn't constructed yet.
|
|
if (HasLoadState(eTreeConstructed)) {
|
|
DispatchScrollingEvent(aTarget, nsIAccessibleEvent::EVENT_SCROLLING);
|
|
}
|
|
lastDispatch.InsertOrUpdate(now);
|
|
}
|
|
});
|
|
|
|
// If timer callback is still pending, push it 100ms into the future.
|
|
// When scrolling ends and we don't fire this callback anymore, the
|
|
// timer callback will fire and dispatch an EVENT_SCROLLING_END.
|
|
if (mScrollWatchTimer) {
|
|
mScrollWatchTimer->SetDelay(kScrollEventInterval);
|
|
} else {
|
|
NS_NewTimerWithFuncCallback(getter_AddRefs(mScrollWatchTimer),
|
|
ScrollTimerCallback, this, kScrollEventInterval,
|
|
nsITimer::TYPE_ONE_SHOT,
|
|
"a11y::DocAccessible::ScrollPositionDidChange");
|
|
if (mScrollWatchTimer) {
|
|
NS_ADDREF_THIS(); // Kung fu death grip
|
|
}
|
|
}
|
|
}
|
|
|
|
std::pair<nsPoint, nsRect> DocAccessible::ComputeScrollData(
|
|
LocalAccessible* aAcc) {
|
|
nsPoint scrollPoint;
|
|
nsRect scrollRange;
|
|
|
|
if (nsIFrame* frame = aAcc->GetFrame()) {
|
|
nsIScrollableFrame* sf = aAcc == this
|
|
? mPresShell->GetRootScrollFrameAsScrollable()
|
|
: frame->GetScrollTargetFrame();
|
|
|
|
// If there is no scrollable frame, it's likely a scroll in a popup, like
|
|
// <select>. Return a scroll offset and range of 0. The scroll info
|
|
// is currently only used on Android, and popups are rendered natively
|
|
// there.
|
|
if (sf) {
|
|
scrollPoint = sf->GetScrollPosition() * mPresShell->GetResolution();
|
|
scrollRange = sf->GetScrollRange();
|
|
scrollRange.ScaleRoundOut(mPresShell->GetResolution());
|
|
}
|
|
}
|
|
|
|
return {scrollPoint, scrollRange};
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsIAccessiblePivotObserver
|
|
|
|
NS_IMETHODIMP
|
|
DocAccessible::OnPivotChanged(nsIAccessiblePivot* aPivot,
|
|
nsIAccessible* aOldAccessible, int32_t aOldStart,
|
|
int32_t aOldEnd, nsIAccessible* aNewAccessible,
|
|
int32_t aNewStart, int32_t aNewEnd,
|
|
PivotMoveReason aReason,
|
|
TextBoundaryType aBoundaryType,
|
|
bool aIsFromUserInput) {
|
|
RefPtr<AccEvent> event = new AccVCChangeEvent(
|
|
this, (aOldAccessible ? aOldAccessible->ToInternalAccessible() : nullptr),
|
|
aOldStart, aOldEnd,
|
|
(aNewAccessible ? aNewAccessible->ToInternalAccessible() : nullptr),
|
|
aNewStart, aNewEnd, aReason, aBoundaryType,
|
|
aIsFromUserInput ? eFromUserInput : eNoUserInput);
|
|
nsEventShell::FireEvent(event);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// nsIDocumentObserver
|
|
|
|
NS_IMPL_NSIDOCUMENTOBSERVER_CORE_STUB(DocAccessible)
|
|
NS_IMPL_NSIDOCUMENTOBSERVER_LOAD_STUB(DocAccessible)
|
|
|
|
void DocAccessible::AttributeWillChange(dom::Element* aElement,
|
|
int32_t aNameSpaceID,
|
|
nsAtom* aAttribute, int32_t aModType) {
|
|
LocalAccessible* accessible = GetAccessible(aElement);
|
|
if (!accessible) {
|
|
if (aElement != mContent) return;
|
|
|
|
accessible = this;
|
|
}
|
|
|
|
// Update dependent IDs cache. Take care of elements that are accessible
|
|
// because dependent IDs cache doesn't contain IDs from non accessible
|
|
// elements.
|
|
if (aModType != dom::MutationEvent_Binding::ADDITION) {
|
|
RemoveDependentIDsFor(accessible, aAttribute);
|
|
}
|
|
|
|
if (aAttribute == nsGkAtoms::id) {
|
|
if (accessible->IsActiveDescendant()) {
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(accessible, states::ACTIVE, false);
|
|
FireDelayedEvent(event);
|
|
}
|
|
|
|
RelocateARIAOwnedIfNeeded(aElement);
|
|
}
|
|
|
|
if (aAttribute == nsGkAtoms::aria_activedescendant) {
|
|
if (LocalAccessible* activeDescendant = accessible->CurrentItem()) {
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(activeDescendant, states::ACTIVE, false);
|
|
FireDelayedEvent(event);
|
|
}
|
|
}
|
|
|
|
// If attribute affects accessible's state, store the old state so we can
|
|
// later compare it against the state of the accessible after the attribute
|
|
// change.
|
|
if (accessible->AttributeChangesState(aAttribute)) {
|
|
mPrevStateBits = accessible->State();
|
|
} else {
|
|
mPrevStateBits = 0;
|
|
}
|
|
}
|
|
|
|
void DocAccessible::NativeAnonymousChildListChange(nsIContent* aContent,
|
|
bool aIsRemove) {
|
|
if (aIsRemove) {
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eTree)) {
|
|
logging::MsgBegin("TREE", "Anonymous content removed; doc: %p", this);
|
|
logging::Node("node", aContent);
|
|
logging::MsgEnd();
|
|
}
|
|
#endif
|
|
|
|
ContentRemoved(aContent);
|
|
}
|
|
}
|
|
|
|
void DocAccessible::AttributeChanged(dom::Element* aElement,
|
|
int32_t aNameSpaceID, nsAtom* aAttribute,
|
|
int32_t aModType,
|
|
const nsAttrValue* aOldValue) {
|
|
NS_ASSERTION(!IsDefunct(),
|
|
"Attribute changed called on defunct document accessible!");
|
|
|
|
// Proceed even if the element is not accessible because element may become
|
|
// accessible if it gets certain attribute.
|
|
if (UpdateAccessibleOnAttrChange(aElement, aAttribute)) return;
|
|
|
|
// Update the accessible tree on aria-hidden change. Make sure to not create
|
|
// a tree under aria-hidden='true'.
|
|
if (aAttribute == nsGkAtoms::aria_hidden) {
|
|
if (aria::HasDefinedARIAHidden(aElement)) {
|
|
ContentRemoved(aElement);
|
|
} else {
|
|
ContentInserted(aElement, aElement->GetNextSibling());
|
|
}
|
|
return;
|
|
}
|
|
|
|
LocalAccessible* accessible = GetAccessible(aElement);
|
|
if (!accessible) {
|
|
if (mContent == aElement) {
|
|
// The attribute change occurred on the root content of this
|
|
// DocAccessible, so handle it as an attribute change on this.
|
|
accessible = this;
|
|
} else {
|
|
if (aModType == dom::MutationEvent_Binding::ADDITION &&
|
|
aria::AttrCharacteristicsFor(aAttribute) & ATTR_GLOBAL) {
|
|
// The element doesn't have an Accessible, but a global ARIA attribute
|
|
// was just added, which means we should probably create an Accessible.
|
|
ContentInserted(aElement, aElement->GetNextSibling());
|
|
return;
|
|
}
|
|
// The element doesn't have an Accessible, so ignore the attribute
|
|
// change.
|
|
return;
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(accessible->IsBoundToParent() || accessible->IsDoc(),
|
|
"DOM attribute change on an accessible detached from the tree");
|
|
|
|
if (aAttribute == nsGkAtoms::id) {
|
|
dom::Element* elm = accessible->Elm();
|
|
RelocateARIAOwnedIfNeeded(elm);
|
|
ARIAActiveDescendantIDMaybeMoved(accessible);
|
|
accessible->SendCache(CacheDomain::DOMNodeID, CacheUpdateType::Update);
|
|
}
|
|
|
|
// The activedescendant universal property redirects accessible focus events
|
|
// to the element with the id that activedescendant points to. Make sure
|
|
// the tree up to date before processing. In other words, when a node has just
|
|
// been inserted, the tree won't be up to date yet, so we must always schedule
|
|
// an async notification so that a newly inserted node will be present in
|
|
// the tree.
|
|
if (aAttribute == nsGkAtoms::aria_activedescendant) {
|
|
mNotificationController
|
|
->ScheduleNotification<DocAccessible, LocalAccessible>(
|
|
this, &DocAccessible::ARIAActiveDescendantChanged, accessible);
|
|
return;
|
|
}
|
|
|
|
// Defer to accessible any needed actions like changing states or emiting
|
|
// events.
|
|
accessible->DOMAttributeChanged(aNameSpaceID, aAttribute, aModType, aOldValue,
|
|
mPrevStateBits);
|
|
|
|
// Update dependent IDs cache. We handle elements with accessibles.
|
|
// If the accessible or element with the ID doesn't exist yet the cache will
|
|
// be updated when they are added.
|
|
if (aModType == dom::MutationEvent_Binding::MODIFICATION ||
|
|
aModType == dom::MutationEvent_Binding::ADDITION) {
|
|
AddDependentIDsFor(accessible, aAttribute);
|
|
}
|
|
}
|
|
|
|
void DocAccessible::ARIAActiveDescendantChanged(LocalAccessible* aAccessible) {
|
|
if (dom::Element* elm = aAccessible->Elm()) {
|
|
nsAutoString id;
|
|
if (elm->GetAttr(kNameSpaceID_None, nsGkAtoms::aria_activedescendant, id)) {
|
|
dom::Element* activeDescendantElm = IDRefsIterator::GetElem(elm, id);
|
|
if (activeDescendantElm) {
|
|
LocalAccessible* activeDescendant = GetAccessible(activeDescendantElm);
|
|
if (activeDescendant) {
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(activeDescendant, states::ACTIVE, true);
|
|
FireDelayedEvent(event);
|
|
if (aAccessible->IsActiveWidget()) {
|
|
FocusMgr()->ActiveItemChanged(activeDescendant, false);
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eFocus)) {
|
|
logging::ActiveItemChangeCausedBy("ARIA activedescedant changed",
|
|
activeDescendant);
|
|
}
|
|
#endif
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
// aria-activedescendant was cleared or changed to a non-existent node.
|
|
// Move focus back to the element itself.
|
|
FocusMgr()->ActiveItemChanged(aAccessible, false);
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eFocus)) {
|
|
logging::ActiveItemChangeCausedBy("ARIA activedescedant cleared",
|
|
aAccessible);
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void DocAccessible::ContentAppended(nsIContent* aFirstNewContent) {
|
|
MaybeHandleChangeToHiddenNameOrDescription(aFirstNewContent);
|
|
}
|
|
|
|
void DocAccessible::ElementStateChanged(dom::Document* aDocument,
|
|
dom::Element* aElement,
|
|
dom::ElementState aStateMask) {
|
|
if (aStateMask.HasState(dom::ElementState::READWRITE) &&
|
|
aElement == mDocumentNode->GetRootElement()) {
|
|
// This handles changes to designMode. contentEditable is handled by
|
|
// LocalAccessible::AttributeChangesState and
|
|
// LocalAccessible::DOMAttributeChanged.
|
|
const bool isEditable =
|
|
aElement->State().HasState(dom::ElementState::READWRITE);
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(this, states::EDITABLE, isEditable);
|
|
FireDelayedEvent(event);
|
|
event = new AccStateChangeEvent(this, states::READONLY, !isEditable);
|
|
FireDelayedEvent(event);
|
|
}
|
|
|
|
LocalAccessible* accessible = GetAccessible(aElement);
|
|
if (!accessible) return;
|
|
|
|
if (aStateMask.HasState(dom::ElementState::CHECKED)) {
|
|
LocalAccessible* widget = accessible->ContainerWidget();
|
|
if (widget && widget->IsSelect()) {
|
|
AccSelChangeEvent::SelChangeType selChangeType =
|
|
aElement->State().HasState(dom::ElementState::CHECKED)
|
|
? AccSelChangeEvent::eSelectionAdd
|
|
: AccSelChangeEvent::eSelectionRemove;
|
|
RefPtr<AccEvent> event =
|
|
new AccSelChangeEvent(widget, accessible, selChangeType);
|
|
FireDelayedEvent(event);
|
|
return;
|
|
}
|
|
|
|
RefPtr<AccEvent> event = new AccStateChangeEvent(
|
|
accessible, states::CHECKED,
|
|
aElement->State().HasState(dom::ElementState::CHECKED));
|
|
FireDelayedEvent(event);
|
|
}
|
|
|
|
if (aStateMask.HasState(dom::ElementState::INVALID)) {
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(accessible, states::INVALID, true);
|
|
FireDelayedEvent(event);
|
|
}
|
|
|
|
if (aStateMask.HasState(dom::ElementState::REQUIRED)) {
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(accessible, states::REQUIRED);
|
|
FireDelayedEvent(event);
|
|
}
|
|
|
|
if (aStateMask.HasState(dom::ElementState::VISITED)) {
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(accessible, states::TRAVERSED, true);
|
|
FireDelayedEvent(event);
|
|
}
|
|
|
|
// We only expose dom::ElementState::DEFAULT on buttons, but we can get
|
|
// notifications for other controls like checkboxes.
|
|
if (aStateMask.HasState(dom::ElementState::DEFAULT) &&
|
|
accessible->IsButton()) {
|
|
RefPtr<AccEvent> event =
|
|
new AccStateChangeEvent(accessible, states::DEFAULT);
|
|
FireDelayedEvent(event);
|
|
}
|
|
}
|
|
|
|
void DocAccessible::CharacterDataWillChange(nsIContent* aContent,
|
|
const CharacterDataChangeInfo&) {}
|
|
|
|
void DocAccessible::CharacterDataChanged(nsIContent* aContent,
|
|
const CharacterDataChangeInfo&) {}
|
|
|
|
void DocAccessible::ContentInserted(nsIContent* aChild) {
|
|
MaybeHandleChangeToHiddenNameOrDescription(aChild);
|
|
}
|
|
|
|
void DocAccessible::ContentRemoved(nsIContent* aChildNode,
|
|
nsIContent* aPreviousSiblingNode) {
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eTree)) {
|
|
logging::MsgBegin("TREE", "DOM content removed; doc: %p", this);
|
|
logging::Node("container node", aChildNode->GetParent());
|
|
logging::Node("content node", aChildNode);
|
|
logging::MsgEnd();
|
|
}
|
|
#endif
|
|
// This one and content removal notification from layout may result in
|
|
// double processing of same subtrees. If it pops up in profiling, then
|
|
// consider reusing a document node cache to reject these notifications early.
|
|
ContentRemoved(aChildNode);
|
|
}
|
|
|
|
void DocAccessible::ParentChainChanged(nsIContent* aContent) {}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// LocalAccessible
|
|
|
|
#ifdef A11Y_LOG
|
|
nsresult DocAccessible::HandleAccEvent(AccEvent* aEvent) {
|
|
if (logging::IsEnabled(logging::eDocLoad)) {
|
|
logging::DocLoadEventHandled(aEvent);
|
|
}
|
|
|
|
return HyperTextAccessible::HandleAccEvent(aEvent);
|
|
}
|
|
#endif
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Public members
|
|
|
|
nsPresContext* DocAccessible::PresContext() const {
|
|
return mPresShell->GetPresContext();
|
|
}
|
|
|
|
void* DocAccessible::GetNativeWindow() const {
|
|
if (!mPresShell) {
|
|
return nullptr;
|
|
}
|
|
|
|
nsViewManager* vm = mPresShell->GetViewManager();
|
|
if (!vm) return nullptr;
|
|
|
|
nsCOMPtr<nsIWidget> widget = vm->GetRootWidget();
|
|
if (widget) return widget->GetNativeData(NS_NATIVE_WINDOW);
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
LocalAccessible* DocAccessible::GetAccessibleByUniqueIDInSubtree(
|
|
void* aUniqueID) {
|
|
LocalAccessible* 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;
|
|
}
|
|
|
|
LocalAccessible* DocAccessible::GetAccessibleOrContainer(
|
|
nsINode* aNode, bool aNoContainerIfPruned) const {
|
|
if (!aNode || !aNode->GetComposedDoc()) {
|
|
return nullptr;
|
|
}
|
|
|
|
nsINode* start = aNode;
|
|
if (auto* shadowRoot = dom::ShadowRoot::FromNode(aNode)) {
|
|
// This can happen, for example, when called within
|
|
// SelectionManager::ProcessSelectionChanged due to focusing a direct
|
|
// child of a shadow root.
|
|
// GetFlattenedTreeParent works on children of a shadow root, but not the
|
|
// shadow root itself.
|
|
start = shadowRoot->GetHost();
|
|
if (!start) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
for (nsINode* currNode : dom::InclusiveFlatTreeAncestors(*start)) {
|
|
// No container if is inside of aria-hidden subtree.
|
|
if (aNoContainerIfPruned && currNode->IsElement() &&
|
|
aria::HasDefinedARIAHidden(currNode->AsElement())) {
|
|
return nullptr;
|
|
}
|
|
|
|
// Check if node is in an unselected deck panel
|
|
if (aNoContainerIfPruned && currNode->IsXULElement()) {
|
|
if (nsIFrame* frame = currNode->AsContent()->GetPrimaryFrame()) {
|
|
nsDeckFrame* deckFrame = do_QueryFrame(frame->GetParent());
|
|
if (deckFrame && deckFrame->GetSelectedBox() != frame) {
|
|
// If deck is not a <tabpanels>, return null
|
|
nsIContent* parentFrameContent = deckFrame->GetContent();
|
|
if (!parentFrameContent ||
|
|
!parentFrameContent->IsXULElement(nsGkAtoms::tabpanels)) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check if node is in zero-sized map
|
|
if (aNoContainerIfPruned && currNode->IsHTMLElement(nsGkAtoms::map)) {
|
|
if (nsIFrame* frame = currNode->AsContent()->GetPrimaryFrame()) {
|
|
if (nsLayoutUtils::GetAllInFlowRectsUnion(frame, frame->GetParent())
|
|
.IsEmpty()) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (LocalAccessible* accessible = GetAccessible(currNode)) {
|
|
return accessible;
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
LocalAccessible* DocAccessible::GetContainerAccessible(nsINode* aNode) const {
|
|
return aNode ? GetAccessibleOrContainer(aNode->GetFlattenedTreeParentNode())
|
|
: nullptr;
|
|
}
|
|
|
|
LocalAccessible* DocAccessible::GetAccessibleOrDescendant(
|
|
nsINode* aNode) const {
|
|
LocalAccessible* acc = GetAccessible(aNode);
|
|
if (acc) return acc;
|
|
|
|
if (aNode == mContent || aNode == mDocumentNode->GetRootElement()) {
|
|
// If the node is the doc's body or root element, return the doc accessible.
|
|
return const_cast<DocAccessible*>(this);
|
|
}
|
|
|
|
acc = GetContainerAccessible(aNode);
|
|
if (acc) {
|
|
TreeWalker walker(acc, aNode->AsContent(),
|
|
TreeWalker::eWalkCache | TreeWalker::eScoped);
|
|
return walker.Next();
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
void DocAccessible::BindToDocument(LocalAccessible* aAccessible,
|
|
const nsRoleMapEntry* aRoleMapEntry) {
|
|
// Put into DOM node cache.
|
|
if (aAccessible->IsNodeMapEntry()) {
|
|
mNodeToAccessibleMap.InsertOrUpdate(aAccessible->GetNode(), aAccessible);
|
|
}
|
|
|
|
// Put into unique ID cache.
|
|
mAccessibleCache.InsertOrUpdate(aAccessible->UniqueID(), RefPtr{aAccessible});
|
|
|
|
aAccessible->SetRoleMapEntry(aRoleMapEntry);
|
|
|
|
if (aAccessible->HasOwnContent()) {
|
|
AddDependentIDsFor(aAccessible);
|
|
|
|
nsIContent* content = aAccessible->GetContent();
|
|
if (content->IsElement() && content->AsElement()->HasAttr(
|
|
kNameSpaceID_None, nsGkAtoms::aria_owns)) {
|
|
mNotificationController->ScheduleRelocation(aAccessible);
|
|
}
|
|
}
|
|
|
|
if (mIPCDoc) {
|
|
mInsertedAccessibles.EnsureInserted(aAccessible);
|
|
}
|
|
}
|
|
|
|
void DocAccessible::UnbindFromDocument(LocalAccessible* aAccessible) {
|
|
NS_ASSERTION(mAccessibleCache.GetWeak(aAccessible->UniqueID()),
|
|
"Unbinding the unbound accessible!");
|
|
|
|
// Fire focus event on accessible having DOM focus if last focus was removed
|
|
// from the tree.
|
|
if (FocusMgr()->WasLastFocused(aAccessible)) {
|
|
FocusMgr()->ActiveItemChanged(nullptr);
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eFocus)) {
|
|
logging::ActiveItemChangeCausedBy("tree shutdown", aAccessible);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
// Remove an accessible from node-to-accessible map if it exists there.
|
|
if (aAccessible->IsNodeMapEntry() &&
|
|
mNodeToAccessibleMap.Get(aAccessible->GetNode()) == aAccessible) {
|
|
mNodeToAccessibleMap.Remove(aAccessible->GetNode());
|
|
}
|
|
|
|
aAccessible->mStateFlags |= eIsNotInDocument;
|
|
|
|
// Update XPCOM part.
|
|
xpcAccessibleDocument* xpcDoc = GetAccService()->GetCachedXPCDocument(this);
|
|
if (xpcDoc) xpcDoc->NotifyOfShutdown(aAccessible);
|
|
|
|
void* uniqueID = aAccessible->UniqueID();
|
|
|
|
NS_ASSERTION(!aAccessible->IsDefunct(), "Shutdown the shutdown accessible!");
|
|
aAccessible->Shutdown();
|
|
|
|
mAccessibleCache.Remove(uniqueID);
|
|
}
|
|
|
|
void DocAccessible::ContentInserted(nsIContent* aStartChildNode,
|
|
nsIContent* aEndChildNode) {
|
|
// Ignore content insertions until we constructed accessible tree. Otherwise
|
|
// schedule tree update on content insertion after layout.
|
|
if (!mNotificationController || !HasLoadState(eTreeConstructed)) {
|
|
return;
|
|
}
|
|
|
|
// The frame constructor guarantees that only ranges with the same parent
|
|
// arrive here in presence of dynamic changes to the page, see
|
|
// nsCSSFrameConstructor::IssueSingleInsertNotifications' callers.
|
|
nsINode* parent = aStartChildNode->GetFlattenedTreeParentNode();
|
|
if (!parent) {
|
|
return;
|
|
}
|
|
|
|
LocalAccessible* container = AccessibleOrTrueContainer(parent);
|
|
if (!container) {
|
|
return;
|
|
}
|
|
|
|
AutoTArray<nsCOMPtr<nsIContent>, 10> list;
|
|
for (nsIContent* node = aStartChildNode; node != aEndChildNode;
|
|
node = node->GetNextSibling()) {
|
|
MOZ_ASSERT(parent == node->GetFlattenedTreeParentNode());
|
|
if (PruneOrInsertSubtree(node)) {
|
|
list.AppendElement(node);
|
|
}
|
|
}
|
|
|
|
mNotificationController->ScheduleContentInsertion(container, list);
|
|
}
|
|
|
|
void DocAccessible::ScheduleTreeUpdate(nsIContent* aContent) {
|
|
if (mPendingUpdates.Contains(aContent)) {
|
|
return;
|
|
}
|
|
mPendingUpdates.AppendElement(aContent);
|
|
mNotificationController->ScheduleProcessing();
|
|
}
|
|
|
|
void DocAccessible::ProcessPendingUpdates() {
|
|
auto updates = std::move(mPendingUpdates);
|
|
for (auto update : updates) {
|
|
if (update->GetComposedDoc() != mDocumentNode) {
|
|
continue;
|
|
}
|
|
// The pruning logic will take care of avoiding unnecessary notifications.
|
|
ContentInserted(update, update->GetNextSibling());
|
|
}
|
|
}
|
|
|
|
bool DocAccessible::PruneOrInsertSubtree(nsIContent* aRoot) {
|
|
bool insert = false;
|
|
|
|
// In the case that we are, or are in, a shadow host, we need to assure
|
|
// some accessibles are removed if they are not rendered anymore.
|
|
nsIContent* shadowHost =
|
|
aRoot->GetShadowRoot() ? aRoot : aRoot->GetContainingShadowHost();
|
|
if (shadowHost) {
|
|
// Check all explicit children in the host, if they are not slotted
|
|
// then remove their accessibles and subtrees.
|
|
for (nsIContent* childNode = shadowHost->GetFirstChild(); childNode;
|
|
childNode = childNode->GetNextSibling()) {
|
|
if (!childNode->GetPrimaryFrame() &&
|
|
!nsCoreUtils::CanCreateAccessibleWithoutFrame(childNode)) {
|
|
ContentRemoved(childNode);
|
|
}
|
|
}
|
|
|
|
// If this is a slot, check to see if its fallback content is rendered,
|
|
// if not - remove it.
|
|
if (aRoot->IsHTMLElement(nsGkAtoms::slot)) {
|
|
for (nsIContent* childNode = aRoot->GetFirstChild(); childNode;
|
|
childNode = childNode->GetNextSibling()) {
|
|
if (!childNode->GetPrimaryFrame() &&
|
|
!nsCoreUtils::CanCreateAccessibleWithoutFrame(childNode)) {
|
|
ContentRemoved(childNode);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we already have an accessible, check if we need to remove it, recreate
|
|
// it, or keep it in place.
|
|
LocalAccessible* acc = GetAccessible(aRoot);
|
|
if (acc) {
|
|
MOZ_ASSERT(aRoot == acc->GetContent(),
|
|
"LocalAccessible has differing content!");
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eTree)) {
|
|
logging::MsgBegin(
|
|
"TREE", "inserted content already has accessible; doc: %p", this);
|
|
logging::Node("content node", aRoot);
|
|
logging::AccessibleInfo("accessible node", acc);
|
|
logging::MsgEnd();
|
|
}
|
|
#endif
|
|
|
|
nsIFrame* frame = acc->GetFrame();
|
|
if (frame) {
|
|
acc->MaybeQueueCacheUpdateForStyleChanges();
|
|
}
|
|
|
|
// LocalAccessible has no frame and it's not display:contents. Remove it.
|
|
// As well as removing the a11y subtree, we must also remove Accessibles
|
|
// for DOM descendants, since some of these might be relocated Accessibles
|
|
// and their DOM nodes are now hidden as well.
|
|
if (!frame && !nsCoreUtils::CanCreateAccessibleWithoutFrame(aRoot)) {
|
|
ContentRemoved(aRoot);
|
|
return false;
|
|
}
|
|
|
|
// If it's a XULLabel it was probably reframed because a `value` attribute
|
|
// was added. The accessible creates its text leaf upon construction, so we
|
|
// need to recreate. Remove it, and schedule for reconstruction.
|
|
if (acc->IsXULLabel()) {
|
|
ContentRemoved(acc);
|
|
return true;
|
|
}
|
|
|
|
// It is a broken image that is being reframed because it either got
|
|
// or lost an `alt` tag that would rerender this node as text.
|
|
if (frame && (acc->IsImage() != (frame->AccessibleType() == eImageType))) {
|
|
ContentRemoved(aRoot);
|
|
return true;
|
|
}
|
|
|
|
// If the frame is an OuterDoc frame but this isn't an OuterDocAccessible,
|
|
// we need to recreate the LocalAccessible. This can happen for embed or
|
|
// object elements if their embedded content changes to be web content.
|
|
if (frame && !acc->IsOuterDoc() &&
|
|
frame->AccessibleType() == eOuterDocType) {
|
|
ContentRemoved(aRoot);
|
|
return true;
|
|
}
|
|
|
|
// If the content is focused, and is being re-framed, reset the selection
|
|
// listener for the node because the previous selection listener is on the
|
|
// old frame.
|
|
if (aRoot->IsElement() && FocusMgr()->HasDOMFocus(aRoot)) {
|
|
SelectionMgr()->SetControlSelectionListener(aRoot->AsElement());
|
|
}
|
|
|
|
// If the accessible is a table, or table part, its layout table
|
|
// status may have changed. We need to invalidate the associated
|
|
// cache, which listens for the following event.
|
|
if (acc->IsTable() || acc->IsTableRow() || acc->IsTableCell()) {
|
|
FireDelayedEvent(nsIAccessibleEvent::EVENT_TABLE_STYLING_CHANGED, acc);
|
|
LocalAccessible* table;
|
|
if (acc->IsTable()) {
|
|
table = acc;
|
|
} else {
|
|
for (table = acc->LocalParent(); table; table = table->LocalParent()) {
|
|
if (table->IsTable()) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (table && table->IsTable()) {
|
|
QueueCacheUpdate(acc, CacheDomain::Table);
|
|
}
|
|
}
|
|
|
|
// The accessible can be reparented or reordered in its parent.
|
|
// We schedule it for reinsertion. For example, a slotted element
|
|
// can change its slot attribute to a different slot.
|
|
insert = true;
|
|
|
|
// If the frame is invisible, remove it.
|
|
// Normally, layout sends explicit a11y notifications for visibility
|
|
// changes (see SendA11yNotifications in RestyleManager). However, if a
|
|
// visibility change also reconstructs the frame, we must handle it here.
|
|
if (frame && !frame->StyleVisibility()->IsVisible()) {
|
|
ContentRemoved(aRoot);
|
|
// There might be visible descendants, so we want to walk the subtree.
|
|
// However, we know we don't want to reinsert this node, so we set insert
|
|
// to false.
|
|
insert = false;
|
|
}
|
|
} else {
|
|
// If there is no current accessible, and the node has a frame, or is
|
|
// display:contents, schedule it for insertion.
|
|
if (aRoot->GetPrimaryFrame() ||
|
|
nsCoreUtils::CanCreateAccessibleWithoutFrame(aRoot)) {
|
|
// This may be a new subtree, the insertion process will recurse through
|
|
// its descendants.
|
|
if (!GetAccessibleOrDescendant(aRoot)) {
|
|
return true;
|
|
}
|
|
|
|
// Content is not an accessible, but has accessible descendants.
|
|
// We schedule this container for insertion strictly for the case where it
|
|
// itself now needs an accessible. We will still need to recurse into the
|
|
// descendant content to prune accessibles, and in all likelyness to
|
|
// insert accessibles since accessible insertions will likeley get missed
|
|
// in an existing subtree.
|
|
insert = true;
|
|
}
|
|
}
|
|
|
|
if (LocalAccessible* container = AccessibleOrTrueContainer(aRoot)) {
|
|
AutoTArray<nsCOMPtr<nsIContent>, 10> list;
|
|
dom::AllChildrenIterator iter =
|
|
dom::AllChildrenIterator(aRoot, nsIContent::eAllChildren, true);
|
|
while (nsIContent* childNode = iter.GetNextChild()) {
|
|
if (PruneOrInsertSubtree(childNode)) {
|
|
list.AppendElement(childNode);
|
|
}
|
|
}
|
|
|
|
if (!list.IsEmpty()) {
|
|
mNotificationController->ScheduleContentInsertion(container, list);
|
|
}
|
|
}
|
|
|
|
return insert;
|
|
}
|
|
|
|
void DocAccessible::RecreateAccessible(nsIContent* aContent) {
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eTree)) {
|
|
logging::MsgBegin("TREE", "accessible recreated");
|
|
logging::Node("content", aContent);
|
|
logging::MsgEnd();
|
|
}
|
|
#endif
|
|
|
|
// XXX: we shouldn't recreate whole accessible subtree, instead we should
|
|
// subclass hide and show events to handle them separately and implement their
|
|
// coalescence with normal hide and show events. Note, in this case they
|
|
// should be coalesced with normal show/hide events.
|
|
ContentRemoved(aContent);
|
|
ContentInserted(aContent, aContent->GetNextSibling());
|
|
}
|
|
|
|
void DocAccessible::ProcessInvalidationList() {
|
|
// Invalidate children of container accessible for each element in
|
|
// invalidation list. Allow invalidation list insertions while container
|
|
// children are recached.
|
|
for (uint32_t idx = 0; idx < mInvalidationList.Length(); idx++) {
|
|
nsIContent* content = mInvalidationList[idx];
|
|
if (!HasAccessible(content) && content->HasID()) {
|
|
LocalAccessible* container = GetContainerAccessible(content);
|
|
if (container) {
|
|
// Check if the node is a target of aria-owns, and if so, don't process
|
|
// it here and let DoARIAOwnsRelocation process it.
|
|
AttrRelProviders* list = GetRelProviders(
|
|
content->AsElement(), nsDependentAtomString(content->GetID()));
|
|
bool shouldProcess = !!list;
|
|
if (shouldProcess) {
|
|
for (uint32_t idx = 0; idx < list->Length(); idx++) {
|
|
if (list->ElementAt(idx)->mRelAttr == nsGkAtoms::aria_owns) {
|
|
shouldProcess = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (shouldProcess) {
|
|
ProcessContentInserted(container, content);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
mInvalidationList.Clear();
|
|
}
|
|
|
|
void DocAccessible::ProcessQueuedCacheUpdates() {
|
|
if (!StaticPrefs::accessibility_cache_enabled_AtStartup()) {
|
|
return;
|
|
}
|
|
|
|
nsTArray<CacheData> data;
|
|
for (auto iter = mQueuedCacheUpdates.Iter(); !iter.Done(); iter.Next()) {
|
|
LocalAccessible* acc = iter.Key();
|
|
uint64_t domain = iter.UserData();
|
|
if (acc->IsInDocument() && !acc->IsDefunct()) {
|
|
RefPtr<AccAttributes> fields =
|
|
acc->BundleFieldsForCache(domain, CacheUpdateType::Update);
|
|
|
|
if (fields->Count()) {
|
|
data.AppendElement(CacheData(
|
|
acc->IsDoc() ? 0 : reinterpret_cast<uint64_t>(acc->UniqueID()),
|
|
fields));
|
|
}
|
|
}
|
|
}
|
|
|
|
mQueuedCacheUpdates.Clear();
|
|
|
|
if (mViewportCacheDirty) {
|
|
RefPtr<AccAttributes> fields =
|
|
BundleFieldsForCache(CacheDomain::Viewport, CacheUpdateType::Update);
|
|
if (fields->Count()) {
|
|
data.AppendElement(CacheData(0, fields));
|
|
}
|
|
mViewportCacheDirty = false;
|
|
}
|
|
|
|
if (data.Length()) {
|
|
IPCDoc()->SendCache(CacheUpdateType::Update, data, true);
|
|
}
|
|
}
|
|
|
|
void DocAccessible::SendAccessiblesWillMove() {
|
|
if (!mIPCDoc) {
|
|
return;
|
|
}
|
|
nsTArray<uint64_t> ids;
|
|
for (LocalAccessible* acc : mMovedAccessibles) {
|
|
// If acc is defunct or not in a document, it was removed after it was
|
|
// moved.
|
|
if (!acc->IsDefunct() && acc->IsInDocument()) {
|
|
ids.AppendElement(reinterpret_cast<uintptr_t>(acc->UniqueID()));
|
|
}
|
|
}
|
|
if (!ids.IsEmpty()) {
|
|
mIPCDoc->SendAccessiblesWillMove(ids);
|
|
}
|
|
}
|
|
|
|
LocalAccessible* 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) {
|
|
LocalAccessible* parent = GetAccessible(imageFrame->GetContent());
|
|
if (parent) {
|
|
LocalAccessible* area =
|
|
parent->AsImageMap()->GetChildAccessibleFor(aNode);
|
|
if (area) return area;
|
|
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
return GetAccessible(aNode);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Protected members
|
|
|
|
void DocAccessible::NotifyOfLoading(bool aIsReloading) {
|
|
// Mark the document accessible as loading, if it stays alive then we'll mark
|
|
// it as loaded when we receive proper notification.
|
|
mLoadState &= ~eDOMLoaded;
|
|
|
|
if (!IsLoadEventTarget()) return;
|
|
|
|
if (aIsReloading && !mLoadEventType &&
|
|
// We can't fire events on a document whose tree isn't constructed yet.
|
|
HasLoadState(eTreeConstructed)) {
|
|
// Fire reload and state busy events on existing document accessible while
|
|
// event from user input flag can be calculated properly and accessible
|
|
// is alive. When new document gets loaded then this one is destroyed.
|
|
RefPtr<AccEvent> reloadEvent =
|
|
new AccEvent(nsIAccessibleEvent::EVENT_DOCUMENT_RELOAD, this);
|
|
nsEventShell::FireEvent(reloadEvent);
|
|
}
|
|
|
|
// Fire state busy change event. Use delayed event since we don't care
|
|
// actually if event isn't delivered when the document goes away like a shot.
|
|
RefPtr<AccEvent> stateEvent =
|
|
new AccStateChangeEvent(this, states::BUSY, true);
|
|
FireDelayedEvent(stateEvent);
|
|
}
|
|
|
|
void DocAccessible::DoInitialUpdate() {
|
|
if (nsCoreUtils::IsTopLevelContentDocInProcess(mDocumentNode)) {
|
|
mDocFlags |= eTopLevelContentDocInProcess;
|
|
if (IPCAccessibilityActive()) {
|
|
nsIDocShell* docShell = mDocumentNode->GetDocShell();
|
|
if (RefPtr<dom::BrowserChild> browserChild =
|
|
dom::BrowserChild::GetFrom(docShell)) {
|
|
// In content processes, top level content documents are always
|
|
// RootAccessibles.
|
|
MOZ_ASSERT(IsRoot());
|
|
DocAccessibleChild* ipcDoc = IPCDoc();
|
|
if (ipcDoc) {
|
|
browserChild->SetTopLevelDocAccessibleChild(ipcDoc);
|
|
} else {
|
|
ipcDoc = new DocAccessibleChild(this, browserChild);
|
|
SetIPCDoc(ipcDoc);
|
|
// Subsequent initialization might depend on being able to get the
|
|
// top level DocAccessibleChild, so set that as early as possible.
|
|
browserChild->SetTopLevelDocAccessibleChild(ipcDoc);
|
|
|
|
#if defined(XP_WIN)
|
|
IAccessibleHolder holder;
|
|
int32_t childID;
|
|
if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
|
|
childID = 0;
|
|
} else {
|
|
holder = CreateHolderFromAccessible(WrapNotNull(this));
|
|
MOZ_ASSERT(!holder.IsNull());
|
|
childID = MsaaAccessible::GetChildIDFor(this);
|
|
}
|
|
#else
|
|
int32_t holder = 0, childID = 0;
|
|
#endif
|
|
browserChild->SendPDocAccessibleConstructor(
|
|
ipcDoc, nullptr, 0, mDocumentNode->GetBrowsingContext(), childID,
|
|
holder);
|
|
#if !defined(XP_WIN)
|
|
ipcDoc->SendPDocAccessiblePlatformExtConstructor();
|
|
#endif
|
|
}
|
|
#if !defined(XP_WIN)
|
|
// It's safe for us to mark top level documents as constructed in the
|
|
// parent process without receiving an explicit message, since we can
|
|
// never get queries for this document or descendants before parent
|
|
// process construction is complete.
|
|
ipcDoc->SetConstructedInParentProcess();
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
mLoadState |= eTreeConstructed;
|
|
|
|
// Set up a root element and ARIA role mapping.
|
|
UpdateRootElIfNeeded();
|
|
|
|
// Build initial tree.
|
|
CacheChildrenInSubtree(this);
|
|
#ifdef A11Y_LOG
|
|
if (logging::IsEnabled(logging::eVerbose)) {
|
|
logging::Tree("TREE", "Initial subtree", this);
|
|
}
|
|
if (logging::IsEnabled(logging::eTreeSize)) {
|
|
logging::TreeSize("TREE SIZE", "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(LocalParent());
|
|
ParentDocument()->FireDelayedEvent(reorderEvent);
|
|
}
|
|
|
|
if (IPCAccessibilityActive()) {
|
|
DocAccessibleChild* ipcDoc = IPCDoc();
|
|
MOZ_ASSERT(ipcDoc);
|
|
if (ipcDoc) {
|
|
if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
|
|
// If we're caching, we should send an initial update for this document
|
|
// and its attributes. Each acc contained in this doc will have its
|
|
// initial update sent in `InsertIntoIpcTree`.
|
|
SendCache(CacheDomain::All, CacheUpdateType::Initial);
|
|
}
|
|
|
|
for (auto idx = 0U; idx < mChildren.Length(); idx++) {
|
|
ipcDoc->InsertIntoIpcTree(this, mChildren.ElementAt(idx), idx, true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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(LocalAccessible* aRelProvider,
|
|
nsAtom* aRelAttr) {
|
|
dom::Element* relProviderEl = aRelProvider->Elm();
|
|
if (!relProviderEl) return;
|
|
|
|
for (uint32_t idx = 0; idx < kRelationAttrsLen; idx++) {
|
|
nsStaticAtom* relAttr = kRelationAttrs[idx];
|
|
if (aRelAttr && aRelAttr != relAttr) continue;
|
|
|
|
if (relAttr == nsGkAtoms::_for) {
|
|
if (!relProviderEl->IsAnyOfHTMLElements(nsGkAtoms::label,
|
|
nsGkAtoms::output)) {
|
|
continue;
|
|
}
|
|
|
|
} else if (relAttr == nsGkAtoms::control) {
|
|
if (!relProviderEl->IsAnyOfXULElements(nsGkAtoms::label,
|
|
nsGkAtoms::description)) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
IDRefsIterator iter(this, relProviderEl, relAttr);
|
|
while (true) {
|
|
const nsDependentSubstring id = iter.NextID();
|
|
if (id.IsEmpty()) break;
|
|
|
|
AttrRelProviders* providers = GetOrCreateRelProviders(relProviderEl, id);
|
|
if (providers) {
|
|
AttrRelProvider* provider = new AttrRelProvider(relAttr, relProviderEl);
|
|
if (provider) {
|
|
providers->AppendElement(provider);
|
|
|
|
// We've got here during the children caching. If the referenced
|
|
// content is not accessible then store it to pend its container
|
|
// children invalidation (this happens immediately after the caching
|
|
// is finished).
|
|
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(LocalAccessible* aRelProvider,
|
|
nsAtom* aRelAttr) {
|
|
dom::Element* relProviderElm = aRelProvider->Elm();
|
|
if (!relProviderElm) return;
|
|
|
|
for (uint32_t idx = 0; idx < kRelationAttrsLen; idx++) {
|
|
nsStaticAtom* relAttr = kRelationAttrs[idx];
|
|
if (aRelAttr && aRelAttr != kRelationAttrs[idx]) continue;
|
|
|
|
IDRefsIterator iter(this, relProviderElm, relAttr);
|
|
while (true) {
|
|
const nsDependentSubstring id = iter.NextID();
|
|
if (id.IsEmpty()) break;
|
|
|
|
AttrRelProviders* providers = GetRelProviders(relProviderElm, id);
|
|
if (providers) {
|
|
providers->RemoveElementsBy(
|
|
[relAttr, relProviderElm](const auto& provider) {
|
|
return provider->mRelAttr == relAttr &&
|
|
provider->mContent == relProviderElm;
|
|
});
|
|
|
|
RemoveRelProvidersIfEmpty(relProviderElm, id);
|
|
}
|
|
}
|
|
|
|
// If the relation attribute is given then we don't have anything else to
|
|
// check.
|
|
if (aRelAttr) break;
|
|
}
|
|
}
|
|
|
|
bool DocAccessible::UpdateAccessibleOnAttrChange(dom::Element* aElement,
|
|
nsAtom* aAttribute) {
|
|
if (aAttribute == nsGkAtoms::role) {
|
|
// It is common for js libraries to set the role on the body element after
|
|
// the document has loaded. In this case we just update the role map entry.
|
|
if (mContent == aElement) {
|
|
SetRoleMapEntryForDoc(aElement);
|
|
if (mIPCDoc) {
|
|
mIPCDoc->SendRoleChangedEvent(Role());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Recreate the accessible when role is changed because we might require a
|
|
// different accessible class for the new role or the accessible may expose
|
|
// a different sets of interfaces (COM restriction).
|
|
RecreateAccessible(aElement);
|
|
|
|
return true;
|
|
}
|
|
|
|
if (aAttribute == nsGkAtoms::multiple) {
|
|
if (dom::HTMLSelectElement* select =
|
|
dom::HTMLSelectElement::FromNode(aElement)) {
|
|
if (select->Size() <= 1) {
|
|
// Adding the 'multiple' attribute to a select that has a size of 1
|
|
// creates a listbox as opposed to a combobox with a popup combobox
|
|
// list. Removing the attribute does the opposite.
|
|
RecreateAccessible(aElement);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (aAttribute == nsGkAtoms::size &&
|
|
aElement->IsHTMLElement(nsGkAtoms::select)) {
|
|
// Changing the size of a select element can potentially change it from a
|
|
// combobox button to a listbox with different underlying implementations.
|
|
RecreateAccessible(aElement);
|
|
return true;
|
|
}
|
|
|
|
if (aAttribute == nsGkAtoms::type) {
|
|
// If the input[type] changes, we should recreate the accessible.
|
|
RecreateAccessible(aElement);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void DocAccessible::UpdateRootElIfNeeded() {
|
|
dom::Element* rootEl = mDocumentNode->GetBodyElement();
|
|
if (!rootEl) {
|
|
rootEl = mDocumentNode->GetRootElement();
|
|
}
|
|
if (rootEl != mContent) {
|
|
mContent = rootEl;
|
|
SetRoleMapEntryForDoc(rootEl);
|
|
if (mIPCDoc) {
|
|
mIPCDoc->SendRoleChangedEvent(Role());
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Content insertion helper.
|
|
*/
|
|
class InsertIterator final {
|
|
public:
|
|
InsertIterator(LocalAccessible* aContext,
|
|
const nsTArray<nsCOMPtr<nsIContent>>* aNodes)
|
|
: mChild(nullptr),
|
|
mChildBefore(nullptr),
|
|
mWalker(aContext),
|
|
mNodes(aNodes),
|
|
mNodesIdx(0) {
|
|
MOZ_ASSERT(aContext, "No context");
|
|
MOZ_ASSERT(aNodes, "No nodes to search for accessible elements");
|
|
MOZ_COUNT_CTOR(InsertIterator);
|
|
}
|
|
MOZ_COUNTED_DTOR(InsertIterator)
|
|
|
|
LocalAccessible* Context() const { return mWalker.Context(); }
|
|
LocalAccessible* Child() const { return mChild; }
|
|
LocalAccessible* 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:
|
|
LocalAccessible* mChild;
|
|
LocalAccessible* mChildBefore;
|
|
TreeWalker mWalker;
|
|
|
|
const nsTArray<nsCOMPtr<nsIContent>>* mNodes;
|
|
nsTHashSet<nsPtrHashKey<const nsIContent>> mProcessedNodes;
|
|
uint32_t mNodesIdx;
|
|
};
|
|
|
|
bool InsertIterator::Next() {
|
|
if (mNodesIdx > 0) {
|
|
// If we already processed the first node in the mNodes list,
|
|
// check if we can just use the walker to get its next sibling.
|
|
LocalAccessible* nextChild = mWalker.Next();
|
|
if (nextChild) {
|
|
mChildBefore = mChild;
|
|
mChild = nextChild;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
while (mNodesIdx < mNodes->Length()) {
|
|
nsIContent* node = mNodes->ElementAt(mNodesIdx++);
|
|
// Check to see if we already processed this node with this iterator.
|
|
// this can happen if we get two redundant insertions in the case of a
|
|
// text and frame insertion.
|
|
if (!mProcessedNodes.EnsureInserted(node)) {
|
|
continue;
|
|
}
|
|
|
|
LocalAccessible* container = Document()->AccessibleOrTrueContainer(
|
|
node->GetFlattenedTreeParentNode(), true);
|
|
// 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.
|
|
if (container != Context()) {
|
|
continue;
|
|
}
|
|
|
|
// HTML comboboxes have no-content list accessible as an intermediate
|
|
// containing all options.
|
|
if (container->IsHTMLCombobox()) {
|
|
container = container->LocalFirstChild();
|
|
}
|
|
|
|
if (!container->IsAcceptableChild(node)) {
|
|
continue;
|
|
}
|
|
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("traversing an inserted node", logging::eVerbose,
|
|
"container", container, "node", node);
|
|
#endif
|
|
|
|
nsIContent* prevNode = mChild ? mChild->GetContent() : nullptr;
|
|
if (prevNode && prevNode->GetNextSibling() == node) {
|
|
// If inserted nodes are siblings then just move the walker next.
|
|
LocalAccessible* nextChild = mWalker.Scope(node);
|
|
if (nextChild) {
|
|
mChildBefore = mChild;
|
|
mChild = nextChild;
|
|
return true;
|
|
}
|
|
} else {
|
|
// Otherwise use a new walker to find this node in the container's
|
|
// subtree, and retrieve its preceding sibling.
|
|
TreeWalker finder(container);
|
|
if (finder.Seek(node)) {
|
|
mChild = mWalker.Scope(node);
|
|
if (mChild) {
|
|
MOZ_ASSERT(!mChild->IsRelocated(), "child cannot be aria owned");
|
|
mChildBefore = finder.Prev();
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void DocAccessible::ProcessContentInserted(
|
|
LocalAccessible* 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 {
|
|
LocalAccessible* parent = iter.Child()->LocalParent();
|
|
if (parent) {
|
|
LocalAccessible* previousSibling = iter.ChildBefore();
|
|
if (parent != aContainer ||
|
|
iter.Child()->LocalPrevSibling() != previousSibling) {
|
|
if (previousSibling && previousSibling->LocalParent() != aContainer) {
|
|
// previousSibling hasn't been moved into aContainer yet.
|
|
// previousSibling should be later in the insertion list, so the tree
|
|
// will get adjusted when we process it later.
|
|
MOZ_DIAGNOSTIC_ASSERT(parent == aContainer,
|
|
"Child moving to new parent, but previous "
|
|
"sibling in wrong parent");
|
|
continue;
|
|
}
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("relocating accessible", 0, "old parent", parent,
|
|
"new parent", aContainer, "child", iter.Child(),
|
|
nullptr);
|
|
#endif
|
|
MoveChild(iter.Child(), aContainer,
|
|
previousSibling ? previousSibling->IndexInParent() + 1 : 0);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (aContainer->InsertAfter(iter.Child(), iter.ChildBefore())) {
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("accessible was inserted", 0, "container", aContainer,
|
|
"child", iter.Child(), nullptr);
|
|
#endif
|
|
|
|
CreateSubtree(iter.Child());
|
|
mt.AfterInsertion(iter.Child());
|
|
continue;
|
|
}
|
|
|
|
MOZ_ASSERT_UNREACHABLE("accessible was rejected");
|
|
iter.Rejected();
|
|
} while (iter.Next());
|
|
|
|
mt.Done();
|
|
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("children after insertion", logging::eVerbose, aContainer);
|
|
#endif
|
|
|
|
FireEventsOnInsertion(aContainer);
|
|
}
|
|
|
|
void DocAccessible::ProcessContentInserted(LocalAccessible* 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)) {
|
|
LocalAccessible* 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(LocalAccessible* aContainer) {
|
|
// Check to see if change occurred inside an alert, and fire an EVENT_ALERT
|
|
// if it did.
|
|
if (aContainer->IsAlert() || aContainer->IsInsideAlert()) {
|
|
LocalAccessible* ancestor = aContainer;
|
|
do {
|
|
if (ancestor->IsAlert()) {
|
|
FireDelayedEvent(nsIAccessibleEvent::EVENT_ALERT, ancestor);
|
|
break;
|
|
}
|
|
} while ((ancestor = ancestor->LocalParent()));
|
|
}
|
|
}
|
|
|
|
void DocAccessible::ContentRemoved(LocalAccessible* aChild) {
|
|
LocalAccessible* parent = aChild->LocalParent();
|
|
MOZ_DIAGNOSTIC_ASSERT(parent, "Unattached accessible from tree");
|
|
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("process content removal", 0, "container", parent, "child",
|
|
aChild, nullptr);
|
|
#endif
|
|
|
|
// XXX: event coalescence may kill us
|
|
RefPtr<LocalAccessible> kungFuDeathGripChild(aChild);
|
|
|
|
TreeMutation mt(parent);
|
|
mt.BeforeRemoval(aChild);
|
|
|
|
if (aChild->IsDefunct()) {
|
|
MOZ_ASSERT_UNREACHABLE("Event coalescence killed the accessible");
|
|
mt.Done();
|
|
return;
|
|
}
|
|
|
|
MOZ_DIAGNOSTIC_ASSERT(aChild->LocalParent(), "Alive but unparented #1");
|
|
|
|
if (aChild->IsRelocated()) {
|
|
nsTArray<RefPtr<LocalAccessible>>* owned = mARIAOwnsHash.Get(parent);
|
|
MOZ_ASSERT(owned, "IsRelocated flag is out of sync with mARIAOwnsHash");
|
|
owned->RemoveElement(aChild);
|
|
if (owned->Length() == 0) {
|
|
mARIAOwnsHash.Remove(parent);
|
|
}
|
|
}
|
|
MOZ_DIAGNOSTIC_ASSERT(aChild->LocalParent(), "Unparented #2");
|
|
UncacheChildrenInSubtree(aChild);
|
|
parent->RemoveChild(aChild);
|
|
|
|
mt.Done();
|
|
}
|
|
|
|
void DocAccessible::ContentRemoved(nsIContent* aContentNode) {
|
|
// If child node is not accessible then look for its accessible children.
|
|
LocalAccessible* acc = GetAccessible(aContentNode);
|
|
if (acc) {
|
|
ContentRemoved(acc);
|
|
}
|
|
|
|
dom::AllChildrenIterator iter =
|
|
dom::AllChildrenIterator(aContentNode, nsIContent::eAllChildren, true);
|
|
while (nsIContent* childNode = iter.GetNextChild()) {
|
|
ContentRemoved(childNode);
|
|
}
|
|
|
|
// If this node has a shadow root, remove its explicit children too.
|
|
// The host node may be removed after the shadow root was attached, and
|
|
// before we asynchronously prune the light DOM and construct the shadow DOM.
|
|
// If this is a case where the node does not have its own accessible, we will
|
|
// not recurse into its current children, so we need to use an
|
|
// ExplicitChildIterator in order to get its accessible children in the light
|
|
// DOM, since they are not accessible anymore via AllChildrenIterator.
|
|
if (aContentNode->GetShadowRoot()) {
|
|
for (nsIContent* childNode = aContentNode->GetFirstChild(); childNode;
|
|
childNode = childNode->GetNextSibling()) {
|
|
ContentRemoved(childNode);
|
|
}
|
|
}
|
|
}
|
|
|
|
bool DocAccessible::RelocateARIAOwnedIfNeeded(nsIContent* aElement) {
|
|
if (!aElement->HasID()) return false;
|
|
|
|
AttrRelProviders* list = GetRelProviders(
|
|
aElement->AsElement(), nsDependentAtomString(aElement->GetID()));
|
|
if (list) {
|
|
for (uint32_t idx = 0; idx < list->Length(); idx++) {
|
|
if (list->ElementAt(idx)->mRelAttr == nsGkAtoms::aria_owns) {
|
|
LocalAccessible* owner = GetAccessible(list->ElementAt(idx)->mContent);
|
|
if (owner) {
|
|
mNotificationController->ScheduleRelocation(owner);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void DocAccessible::DoARIAOwnsRelocation(LocalAccessible* 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<LocalAccessible>>* owned =
|
|
mARIAOwnsHash.GetOrInsertNew(aOwner);
|
|
|
|
IDRefsIterator iter(this, aOwner->Elm(), nsGkAtoms::aria_owns);
|
|
uint32_t idx = 0;
|
|
while (nsIContent* childEl = iter.NextElem()) {
|
|
LocalAccessible* child = GetAccessible(childEl);
|
|
auto insertIdx = aOwner->ChildCount() - owned->Length() + idx;
|
|
|
|
// Make an attempt to create an accessible if it wasn't created yet.
|
|
if (!child) {
|
|
// An owned child cannot be an ancestor of the owner.
|
|
bool ok = true;
|
|
bool check = true;
|
|
for (LocalAccessible* parent = aOwner; parent && !parent->IsDoc();
|
|
parent = parent->LocalParent()) {
|
|
if (check) {
|
|
if (parent->Elm()->IsInclusiveDescendantOf(childEl)) {
|
|
ok = false;
|
|
break;
|
|
}
|
|
}
|
|
// We need to do the DOM descendant check again whenever the DOM
|
|
// lineage changes. If parent is relocated, that means the next
|
|
// ancestor will have a different DOM lineage.
|
|
check = parent->IsRelocated();
|
|
}
|
|
if (!ok) {
|
|
continue;
|
|
}
|
|
|
|
if (aOwner->IsAcceptableChild(childEl)) {
|
|
child = GetAccService()->CreateAccessible(childEl, aOwner);
|
|
if (child) {
|
|
TreeMutation imut(aOwner);
|
|
aOwner->InsertChildAt(insertIdx, child);
|
|
imut.AfterInsertion(child);
|
|
imut.Done();
|
|
|
|
child->SetRelocated(true);
|
|
owned->InsertElementAt(idx, child);
|
|
idx++;
|
|
|
|
// Create subtree before adjusting the insertion index, since subtree
|
|
// creation may alter children in the container.
|
|
CreateSubtree(child);
|
|
FireEventsOnInsertion(aOwner);
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("aria owns traversal", logging::eVerbose, "candidate",
|
|
child, nullptr);
|
|
#endif
|
|
|
|
if (owned->IndexOf(child) < idx) {
|
|
continue; // ignore second entry of same ID
|
|
}
|
|
|
|
// Same child on same position, no change.
|
|
if (child->LocalParent() == aOwner) {
|
|
int32_t indexInParent = child->IndexInParent();
|
|
|
|
// The child is being placed in its current index,
|
|
// eg. aria-owns='id1 id2 id3' is changed to aria-owns='id3 id2 id1'.
|
|
if (indexInParent == static_cast<int32_t>(insertIdx)) {
|
|
MOZ_ASSERT(child->IsRelocated(),
|
|
"A child, having an index in parent from aria ownded "
|
|
"indices range, has to be aria owned");
|
|
MOZ_ASSERT(owned->ElementAt(idx) == child,
|
|
"Unexpected child in ARIA owned array");
|
|
idx++;
|
|
continue;
|
|
}
|
|
|
|
// The child is being inserted directly after its current index,
|
|
// resulting in a no-move case. This will happen when a parent aria-owns
|
|
// its last ordinal child:
|
|
// <ul aria-owns='id2'><li id='id1'></li><li id='id2'></li></ul>
|
|
if (indexInParent == static_cast<int32_t>(insertIdx) - 1) {
|
|
MOZ_ASSERT(!child->IsRelocated(),
|
|
"Child should be in its ordinal position");
|
|
child->SetRelocated(true);
|
|
owned->InsertElementAt(idx, child);
|
|
idx++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
MOZ_ASSERT(owned->SafeElementAt(idx) != child, "Already in place!");
|
|
|
|
// A new child is found, check for loops.
|
|
if (child->LocalParent() != aOwner) {
|
|
// Child is aria-owned by another container, skip.
|
|
if (child->IsRelocated()) {
|
|
continue;
|
|
}
|
|
|
|
LocalAccessible* parent = aOwner;
|
|
while (parent && parent != child && !parent->IsDoc()) {
|
|
parent = parent->LocalParent();
|
|
}
|
|
// 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.GetOrInsertNew(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<LocalAccessible>>* aChildren, uint32_t aStartIdx) {
|
|
MOZ_ASSERT(aStartIdx <= aChildren->Length(), "Wrong removal index");
|
|
|
|
for (auto idx = aStartIdx; idx < aChildren->Length(); idx++) {
|
|
LocalAccessible* child = aChildren->ElementAt(idx);
|
|
if (!child->IsInDocument()) {
|
|
continue;
|
|
}
|
|
|
|
// Remove the child from the owner
|
|
LocalAccessible* owner = child->LocalParent();
|
|
if (!owner) {
|
|
NS_ERROR("Cannot put the child back. No parent, a broken tree.");
|
|
continue;
|
|
}
|
|
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("aria owns put child back", 0, "old parent", owner,
|
|
"child", child, nullptr);
|
|
#endif
|
|
|
|
// Unset relocated flag to find an insertion point for the child.
|
|
child->SetRelocated(false);
|
|
|
|
nsIContent* content = child->GetContent();
|
|
int32_t idxInParent = -1;
|
|
LocalAccessible* origContainer =
|
|
AccessibleOrTrueContainer(content->GetFlattenedTreeParentNode());
|
|
if (origContainer) {
|
|
TreeWalker walker(origContainer);
|
|
if (walker.Seek(content)) {
|
|
LocalAccessible* prevChild = walker.Prev();
|
|
if (prevChild) {
|
|
idxInParent = prevChild->IndexInParent() + 1;
|
|
MOZ_DIAGNOSTIC_ASSERT(origContainer == prevChild->LocalParent(),
|
|
"Broken tree");
|
|
origContainer = prevChild->LocalParent();
|
|
} else {
|
|
idxInParent = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
// The child may have already be in its ordinal place for 2 reasons:
|
|
// 1. It was the last ordinal child, and the first aria-owned child.
|
|
// given: <ul id="list" aria-owns="b"><li id="a"></li><li
|
|
// id="b"></li></ul> after load: $("list").setAttribute("aria-owns", "");
|
|
// 2. The preceding adopted children were just reclaimed, eg:
|
|
// given: <ul id="list"><li id="b"></li></ul>
|
|
// after load: $("list").setAttribute("aria-owns", "a b");
|
|
// later: $("list").setAttribute("aria-owns", "");
|
|
if (origContainer != owner || child->IndexInParent() != idxInParent) {
|
|
DebugOnly<bool> moved = MoveChild(child, origContainer, idxInParent);
|
|
MOZ_ASSERT(moved, "Failed to put child back.");
|
|
} else {
|
|
MOZ_ASSERT(!child->LocalPrevSibling() ||
|
|
!child->LocalPrevSibling()->IsRelocated(),
|
|
"No relocated child should appear before this one");
|
|
MOZ_ASSERT(!child->LocalNextSibling() ||
|
|
child->LocalNextSibling()->IsRelocated(),
|
|
"No ordinal child should appear after this one");
|
|
}
|
|
}
|
|
|
|
aChildren->RemoveLastElements(aChildren->Length() - aStartIdx);
|
|
}
|
|
|
|
void DocAccessible::TrackMovedAccessible(LocalAccessible* aAcc) {
|
|
// If an Accessible is inserted and moved during the same tick, don't track
|
|
// it as a move because it hasn't been shown yet.
|
|
if (!mInsertedAccessibles.Contains(aAcc)) {
|
|
mMovedAccessibles.EnsureInserted(aAcc);
|
|
}
|
|
// When we move an Accessible, we're also moving its descendants.
|
|
for (uint32_t c = 0, count = aAcc->ContentChildCount(); c < count; ++c) {
|
|
TrackMovedAccessible(aAcc->ContentChildAt(c));
|
|
}
|
|
}
|
|
|
|
bool DocAccessible::MoveChild(LocalAccessible* aChild,
|
|
LocalAccessible* aNewParent,
|
|
int32_t aIdxInParent) {
|
|
MOZ_ASSERT(aChild, "No child");
|
|
MOZ_ASSERT(aChild->LocalParent(), "No parent");
|
|
// We can't guarantee MoveChild works correctly for accessibilities storing
|
|
// children outside mChildren.
|
|
MOZ_ASSERT(
|
|
aIdxInParent <= static_cast<int32_t>(aNewParent->mChildren.Length()),
|
|
"Wrong insertion point for a moving child");
|
|
|
|
LocalAccessible* curParent = aChild->LocalParent();
|
|
|
|
if (!aNewParent->IsAcceptableChild(aChild->GetContent())) {
|
|
return false;
|
|
}
|
|
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("move child", 0, "old parent", curParent, "new parent",
|
|
aNewParent, "child", aChild, nullptr);
|
|
#endif
|
|
|
|
// Forget aria-owns info in case of ARIA owned element. The caller is expected
|
|
// to update it if needed.
|
|
if (aChild->IsRelocated()) {
|
|
aChild->SetRelocated(false);
|
|
nsTArray<RefPtr<LocalAccessible>>* owned = mARIAOwnsHash.Get(curParent);
|
|
MOZ_ASSERT(owned, "IsRelocated flag is out of sync with mARIAOwnsHash");
|
|
owned->RemoveElement(aChild);
|
|
if (owned->Length() == 0) {
|
|
mARIAOwnsHash.Remove(curParent);
|
|
}
|
|
}
|
|
|
|
NotificationController::MoveGuard mguard(mNotificationController);
|
|
|
|
if (curParent == aNewParent) {
|
|
MOZ_ASSERT(aChild->IndexInParent() != aIdxInParent, "No move case");
|
|
curParent->RelocateChild(aIdxInParent, aChild);
|
|
if (mIPCDoc) {
|
|
TrackMovedAccessible(aChild);
|
|
}
|
|
|
|
#ifdef A11Y_LOG
|
|
logging::TreeInfo("move child: parent tree after", logging::eVerbose,
|
|
curParent);
|
|
#endif
|
|
return true;
|
|
}
|
|
|
|
// If the child cannot be re-inserted into the tree, then make sure to remove
|
|
// it from its present parent and then shutdown it.
|
|
bool hasInsertionPoint =
|
|
(aIdxInParent >= 0) &&
|
|
(aIdxInParent <= static_cast<int32_t>(aNewParent->mChildren.Length()));
|
|
|
|
TreeMutation rmut(curParent);
|
|
rmut.BeforeRemoval(aChild, hasInsertionPoint && TreeMutation::kNoShutdown);
|
|
curParent->RemoveChild(aChild);
|
|
rmut.Done();
|
|
|
|
// No insertion point for the child.
|
|
if (!hasInsertionPoint) {
|
|
return true;
|
|
}
|
|
|
|
TreeMutation imut(aNewParent);
|
|
aNewParent->InsertChildAt(aIdxInParent, aChild);
|
|
if (mIPCDoc) {
|
|
TrackMovedAccessible(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(LocalAccessible* aRoot,
|
|
LocalAccessible** 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;
|
|
}
|
|
|
|
LocalAccessible* root =
|
|
aRoot->IsHTMLCombobox() ? aRoot->LocalFirstChild() : aRoot;
|
|
if (root->KidsFromDOM()) {
|
|
TreeMutation mt(root, TreeMutation::kNoEvents);
|
|
TreeWalker walker(root);
|
|
while (LocalAccessible* child = walker.Next()) {
|
|
if (child->IsBoundToParent()) {
|
|
MoveChild(child, root, root->mChildren.Length());
|
|
continue;
|
|
}
|
|
|
|
root->AppendChild(child);
|
|
mt.AfterInsertion(child);
|
|
|
|
CacheChildrenInSubtree(child, aFocusedAcc);
|
|
}
|
|
mt.Done();
|
|
}
|
|
|
|
// Fire events for ARIA elements.
|
|
if (!aRoot->HasARIARole()) {
|
|
return;
|
|
}
|
|
|
|
// XXX: we should delay document load complete event if the ARIA document
|
|
// has aria-busy.
|
|
roles::Role role = aRoot->ARIARole();
|
|
if (!aRoot->IsDoc() &&
|
|
(role == roles::DIALOG || role == roles::NON_NATIVE_DOCUMENT)) {
|
|
FireDelayedEvent(nsIAccessibleEvent::EVENT_DOCUMENT_LOAD_COMPLETE, aRoot);
|
|
}
|
|
}
|
|
|
|
void DocAccessible::UncacheChildrenInSubtree(LocalAccessible* aRoot) {
|
|
aRoot->mStateFlags |= eIsNotInDocument;
|
|
RemoveDependentIDsFor(aRoot);
|
|
|
|
// The parent of the removed subtree is about to be cleared, so we must do
|
|
// this here rather than in LocalAccessible::UnbindFromParent because we need
|
|
// the ancestry for this to work.
|
|
if (StaticPrefs::accessibility_cache_enabled_AtStartup() &&
|
|
(aRoot->IsTable() || aRoot->IsTableCell())) {
|
|
CachedTableAccessible::Invalidate(aRoot);
|
|
}
|
|
|
|
nsTArray<RefPtr<LocalAccessible>>* owned = mARIAOwnsHash.Get(aRoot);
|
|
uint32_t count = aRoot->ContentChildCount();
|
|
for (uint32_t idx = 0; idx < count; idx++) {
|
|
LocalAccessible* child = aRoot->ContentChildAt(idx);
|
|
|
|
if (child->IsRelocated()) {
|
|
MOZ_ASSERT(owned, "IsRelocated flag is out of sync with mARIAOwnsHash");
|
|
owned->RemoveElement(child);
|
|
if (owned->Length() == 0) {
|
|
mARIAOwnsHash.Remove(aRoot);
|
|
owned = nullptr;
|
|
}
|
|
}
|
|
|
|
// Removing this accessible from the document doesn't mean anything about
|
|
// accessibles for subdocuments, so skip removing those from the tree.
|
|
if (!child->IsDoc()) {
|
|
UncacheChildrenInSubtree(child);
|
|
}
|
|
}
|
|
|
|
if (aRoot->IsNodeMapEntry() &&
|
|
mNodeToAccessibleMap.Get(aRoot->GetNode()) == aRoot) {
|
|
mNodeToAccessibleMap.Remove(aRoot->GetNode());
|
|
}
|
|
}
|
|
|
|
void DocAccessible::ShutdownChildrenInSubtree(LocalAccessible* 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++) {
|
|
LocalAccessible* 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();
|
|
if (!treeItem) {
|
|
return false;
|
|
}
|
|
|
|
nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
|
|
treeItem->GetInProcessParent(getter_AddRefs(parentTreeItem));
|
|
|
|
// Not a root document.
|
|
if (parentTreeItem) {
|
|
// Return true if it's either:
|
|
// a) tab document;
|
|
nsCOMPtr<nsIDocShellTreeItem> rootTreeItem;
|
|
treeItem->GetInProcessRootTreeItem(getter_AddRefs(rootTreeItem));
|
|
if (parentTreeItem == rootTreeItem) return true;
|
|
|
|
// b) frame/iframe document and its parent document is not in loading state
|
|
// Note: we can get notifications while document is loading (and thus
|
|
// while there's no parent document yet).
|
|
DocAccessible* parentDoc = ParentDocument();
|
|
return parentDoc && parentDoc->HasLoadState(eCompletelyLoaded);
|
|
}
|
|
|
|
// It's content (not chrome) root document.
|
|
return (treeItem->ItemType() == nsIDocShellTreeItem::typeContent);
|
|
}
|
|
|
|
void DocAccessible::SetIPCDoc(DocAccessibleChild* aIPCDoc) {
|
|
MOZ_ASSERT(!mIPCDoc || !aIPCDoc, "Clobbering an attached IPCDoc!");
|
|
mIPCDoc = aIPCDoc;
|
|
}
|
|
|
|
void DocAccessible::DispatchScrollingEvent(nsINode* aTarget,
|
|
uint32_t aEventType) {
|
|
LocalAccessible* acc = GetAccessible(aTarget);
|
|
if (!acc) {
|
|
return;
|
|
}
|
|
|
|
nsIFrame* frame = acc->GetFrame();
|
|
if (!frame) {
|
|
// Although the accessible had a frame at scroll time, it may now be gone
|
|
// because of display: contents.
|
|
return;
|
|
}
|
|
|
|
auto [scrollPoint, scrollRange] = ComputeScrollData(acc);
|
|
|
|
int32_t appUnitsPerDevPixel =
|
|
mPresShell->GetPresContext()->AppUnitsPerDevPixel();
|
|
|
|
LayoutDeviceIntPoint scrollPointDP = LayoutDevicePoint::FromAppUnitsToNearest(
|
|
scrollPoint, appUnitsPerDevPixel);
|
|
LayoutDeviceIntRect scrollRangeDP =
|
|
LayoutDeviceRect::FromAppUnitsToNearest(scrollRange, appUnitsPerDevPixel);
|
|
|
|
RefPtr<AccEvent> event =
|
|
new AccScrollingEvent(aEventType, acc, scrollPointDP.x, scrollPointDP.y,
|
|
scrollRangeDP.width, scrollRangeDP.height);
|
|
nsEventShell::FireEvent(event);
|
|
}
|
|
|
|
void DocAccessible::ARIAActiveDescendantIDMaybeMoved(
|
|
LocalAccessible* aAccessible) {
|
|
LocalAccessible* widget = nullptr;
|
|
if (aAccessible->IsActiveDescendant(&widget) && widget) {
|
|
// The active descendant might have just been inserted and may not be in the
|
|
// tree yet. Therefore, schedule this async to ensure the tree is up to
|
|
// date.
|
|
mNotificationController
|
|
->ScheduleNotification<DocAccessible, LocalAccessible>(
|
|
this, &DocAccessible::ARIAActiveDescendantChanged, widget);
|
|
}
|
|
}
|
|
|
|
void DocAccessible::SetRoleMapEntryForDoc(dom::Element* aElement) {
|
|
const nsRoleMapEntry* entry = aria::GetRoleMap(aElement);
|
|
if (!entry || entry->role == roles::APPLICATION ||
|
|
entry->role == roles::DIALOG ||
|
|
// Role alert isn't valid on the body element according to the ARIA spec,
|
|
// but it's useful for our UI; e.g. the WebRTC sharing indicator.
|
|
(entry->role == roles::ALERT && !mDocumentNode->IsContentDocument())) {
|
|
SetRoleMapEntry(entry);
|
|
return;
|
|
}
|
|
// No other ARIA roles are valid on body elements.
|
|
SetRoleMapEntry(nullptr);
|
|
}
|
|
|
|
LocalAccessible* DocAccessible::GetAccessible(nsINode* aNode) const {
|
|
return aNode == mDocumentNode ? const_cast<DocAccessible*>(this)
|
|
: mNodeToAccessibleMap.Get(aNode);
|
|
}
|
|
|
|
bool DocAccessible::HasPrimaryAction() const {
|
|
if (HyperTextAccessible::HasPrimaryAction()) {
|
|
return true;
|
|
}
|
|
// mContent is normally the body, but there might be a click listener on the
|
|
// root.
|
|
dom::Element* root = mDocumentNode->GetRootElement();
|
|
if (mContent != root) {
|
|
return nsCoreUtils::HasClickListener(root);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void DocAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
|
|
aName.Truncate();
|
|
if (aIndex != 0) {
|
|
return;
|
|
}
|
|
if (HasPrimaryAction()) {
|
|
aName.AssignLiteral("click");
|
|
}
|
|
}
|
|
|
|
void DocAccessible::MaybeHandleChangeToHiddenNameOrDescription(
|
|
nsIContent* aChild) {
|
|
if (!HasLoadState(eTreeConstructed)) {
|
|
return;
|
|
}
|
|
for (nsIContent* content = aChild; content; content = content->GetParent()) {
|
|
if (HasAccessible(content)) {
|
|
// This node isn't hidden. Events for name/description dependents will be
|
|
// fired elsewhere.
|
|
break;
|
|
}
|
|
nsAtom* id = content->GetID();
|
|
if (!id) {
|
|
continue;
|
|
}
|
|
auto* providers =
|
|
GetRelProviders(content->AsElement(), nsDependentAtomString(id));
|
|
if (!providers) {
|
|
continue;
|
|
}
|
|
for (auto& provider : *providers) {
|
|
if (provider->mRelAttr != nsGkAtoms::aria_labelledby &&
|
|
provider->mRelAttr != nsGkAtoms::aria_describedby) {
|
|
continue;
|
|
}
|
|
LocalAccessible* dependentAcc = GetAccessible(provider->mContent);
|
|
if (!dependentAcc) {
|
|
continue;
|
|
}
|
|
FireDelayedEvent(provider->mRelAttr == nsGkAtoms::aria_labelledby
|
|
? nsIAccessibleEvent::EVENT_NAME_CHANGE
|
|
: nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE,
|
|
dependentAcc);
|
|
}
|
|
}
|
|
}
|