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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 01:47:29 +0000
commit0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch)
treea31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /accessible/generic/LocalAccessible.cpp
parentInitial commit. (diff)
downloadfirefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz
firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'accessible/generic/LocalAccessible.cpp')
-rw-r--r--accessible/generic/LocalAccessible.cpp4068
1 files changed, 4068 insertions, 0 deletions
diff --git a/accessible/generic/LocalAccessible.cpp b/accessible/generic/LocalAccessible.cpp
new file mode 100644
index 0000000000..a732f03a08
--- /dev/null
+++ b/accessible/generic/LocalAccessible.cpp
@@ -0,0 +1,4068 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "AccEvent.h"
+#include "LocalAccessible-inl.h"
+
+#include <stdint.h>
+#include "EmbeddedObjCollector.h"
+#include "AccAttributes.h"
+#include "AccGroupInfo.h"
+#include "AccIterator.h"
+#include "CacheConstants.h"
+#include "CachedTableAccessible.h"
+#include "DocAccessible-inl.h"
+#include "mozilla/a11y/AccAttributes.h"
+#include "mozilla/a11y/TableAccessible.h"
+#include "mozilla/a11y/TableCellAccessible.h"
+#include "nsAccUtils.h"
+#include "nsAccessibilityService.h"
+#include "ApplicationAccessible.h"
+#include "nsAccessiblePivot.h"
+#include "nsGenericHTMLElement.h"
+#include "NotificationController.h"
+#include "nsEventShell.h"
+#include "nsTextEquivUtils.h"
+#include "DocAccessibleChild.h"
+#include "EventTree.h"
+#include "OuterDocAccessible.h"
+#include "Pivot.h"
+#include "Relation.h"
+#include "Role.h"
+#include "RootAccessible.h"
+#include "States.h"
+#include "StyleInfo.h"
+#include "TextLeafRange.h"
+#include "TextRange.h"
+#include "TreeWalker.h"
+#include "HTMLElementAccessibles.h"
+#include "HTMLSelectAccessible.h"
+#include "HTMLTableAccessible.h"
+#include "ImageAccessible.h"
+
+#include "nsComputedDOMStyle.h"
+#include "nsGkAtoms.h"
+#include "nsIDOMXULButtonElement.h"
+#include "nsIDOMXULSelectCntrlEl.h"
+#include "nsIDOMXULSelectCntrlItemEl.h"
+#include "nsINodeList.h"
+#include "nsPIDOMWindow.h"
+
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/HTMLFormElement.h"
+#include "mozilla/dom/HTMLAnchorElement.h"
+#include "mozilla/gfx/Matrix.h"
+#include "nsIContent.h"
+#include "nsIFormControl.h"
+
+#include "nsDisplayList.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsIFrame.h"
+#include "nsTextFrame.h"
+#include "nsView.h"
+#include "nsIDocShellTreeItem.h"
+#include "nsIScrollableFrame.h"
+#include "nsStyleStructInlines.h"
+#include "nsFocusManager.h"
+
+#include "nsString.h"
+#include "nsUnicharUtils.h"
+#include "nsReadableUtils.h"
+#include "prdtoa.h"
+#include "nsAtom.h"
+#include "nsArrayUtils.h"
+#include "nsWhitespaceTokenizer.h"
+#include "nsAttrName.h"
+#include "nsContainerFrame.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/Components.h"
+#include "mozilla/ErrorResult.h"
+#include "mozilla/FloatingPoint.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/Unused.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/ProfilerMarkers.h"
+#include "mozilla/StaticPrefs_ui.h"
+#include "mozilla/dom/CanvasRenderingContext2D.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/HTMLCanvasElement.h"
+#include "mozilla/dom/HTMLBodyElement.h"
+#include "mozilla/dom/HTMLLabelElement.h"
+#include "mozilla/dom/KeyboardEventBinding.h"
+#include "mozilla/dom/TreeWalker.h"
+#include "mozilla/dom/UserActivation.h"
+#include "mozilla/dom/MutationEventBinding.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible: nsISupports and cycle collection
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(LocalAccessible)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(LocalAccessible)
+ tmp->Shutdown();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(LocalAccessible)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent, mDoc)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LocalAccessible)
+ NS_INTERFACE_MAP_ENTRY_CONCRETE(LocalAccessible)
+ NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, LocalAccessible)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(LocalAccessible)
+NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_DESTROY(LocalAccessible, LastRelease())
+
+LocalAccessible::LocalAccessible(nsIContent* aContent, DocAccessible* aDoc)
+ : Accessible(),
+ mContent(aContent),
+ mDoc(aDoc),
+ mParent(nullptr),
+ mIndexInParent(-1),
+ mBounds(),
+ mFirstLineStart(-1),
+ mStateFlags(0),
+ mContextFlags(0),
+ mReorderEventTarget(false),
+ mShowEventTarget(false),
+ mHideEventTarget(false),
+ mIndexOfEmbeddedChild(-1),
+ mGroupInfo(nullptr) {}
+
+LocalAccessible::~LocalAccessible() {
+ NS_ASSERTION(!mDoc, "LastRelease was never called!?!");
+}
+
+ENameValueFlag LocalAccessible::Name(nsString& aName) const {
+ aName.Truncate();
+
+ if (!HasOwnContent()) return eNameOK;
+
+ ARIAName(aName);
+ if (!aName.IsEmpty()) return eNameOK;
+
+ ENameValueFlag nameFlag = NativeName(aName);
+ if (!aName.IsEmpty()) return nameFlag;
+
+ // In the end get the name from tooltip.
+ if (mContent->IsHTMLElement()) {
+ if (mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::title,
+ aName)) {
+ aName.CompressWhitespace();
+ return eNameFromTooltip;
+ }
+ } else if (mContent->IsXULElement()) {
+ if (mContent->AsElement()->GetAttr(kNameSpaceID_None,
+ nsGkAtoms::tooltiptext, aName)) {
+ aName.CompressWhitespace();
+ return eNameFromTooltip;
+ }
+ } else if (mContent->IsSVGElement()) {
+ // If user agents need to choose among multiple 'desc' or 'title'
+ // elements for processing, the user agent shall choose the first one.
+ for (nsIContent* childElm = mContent->GetFirstChild(); childElm;
+ childElm = childElm->GetNextSibling()) {
+ if (childElm->IsSVGElement(nsGkAtoms::desc)) {
+ nsTextEquivUtils::AppendTextEquivFromContent(this, childElm, &aName);
+ return eNameFromTooltip;
+ }
+ }
+ }
+
+ aName.SetIsVoid(true);
+
+ return nameFlag;
+}
+
+void LocalAccessible::Description(nsString& aDescription) const {
+ // There are 4 conditions that make an accessible have no accDescription:
+ // 1. it's a text node; or
+ // 2. It has no ARIA describedby or description property
+ // 3. it doesn't have an accName; or
+ // 4. its title attribute already equals to its accName nsAutoString name;
+
+ if (!HasOwnContent() || mContent->IsText()) return;
+
+ ARIADescription(aDescription);
+
+ if (aDescription.IsEmpty()) {
+ NativeDescription(aDescription);
+
+ if (aDescription.IsEmpty()) {
+ // Keep the Name() method logic.
+ if (mContent->IsHTMLElement()) {
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::title,
+ aDescription);
+ } else if (mContent->IsXULElement()) {
+ mContent->AsElement()->GetAttr(kNameSpaceID_None,
+ nsGkAtoms::tooltiptext, aDescription);
+ } else if (mContent->IsSVGElement()) {
+ for (nsIContent* childElm = mContent->GetFirstChild(); childElm;
+ childElm = childElm->GetNextSibling()) {
+ if (childElm->IsSVGElement(nsGkAtoms::desc)) {
+ nsTextEquivUtils::AppendTextEquivFromContent(this, childElm,
+ &aDescription);
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ if (!aDescription.IsEmpty()) {
+ aDescription.CompressWhitespace();
+ nsAutoString name;
+ Name(name);
+ // Don't expose a description if it is the same as the name.
+ if (aDescription.Equals(name)) aDescription.Truncate();
+ }
+}
+
+KeyBinding LocalAccessible::AccessKey() const {
+ if (!HasOwnContent()) return KeyBinding();
+
+ uint32_t key = nsCoreUtils::GetAccessKeyFor(mContent);
+ if (!key && mContent->IsElement()) {
+ LocalAccessible* label = nullptr;
+
+ // Copy access key from label node.
+ if (mContent->IsHTMLElement()) {
+ // Unless it is labeled via an ancestor <label>, in which case that would
+ // be redundant.
+ HTMLLabelIterator iter(Document(), this,
+ HTMLLabelIterator::eSkipAncestorLabel);
+ label = iter.Next();
+ }
+ if (!label) {
+ XULLabelIterator iter(Document(), mContent);
+ label = iter.Next();
+ }
+
+ if (label) key = nsCoreUtils::GetAccessKeyFor(label->GetContent());
+ }
+
+ if (!key) return KeyBinding();
+
+ // Get modifier mask. Use ui.key.generalAccessKey (unless it is -1).
+ switch (StaticPrefs::ui_key_generalAccessKey()) {
+ case -1:
+ break;
+ case dom::KeyboardEvent_Binding::DOM_VK_SHIFT:
+ return KeyBinding(key, KeyBinding::kShift);
+ case dom::KeyboardEvent_Binding::DOM_VK_CONTROL:
+ return KeyBinding(key, KeyBinding::kControl);
+ case dom::KeyboardEvent_Binding::DOM_VK_ALT:
+ return KeyBinding(key, KeyBinding::kAlt);
+ case dom::KeyboardEvent_Binding::DOM_VK_META:
+ return KeyBinding(key, KeyBinding::kMeta);
+ default:
+ return KeyBinding();
+ }
+
+ // Determine the access modifier used in this context.
+ dom::Document* document = mContent->GetComposedDoc();
+ if (!document) return KeyBinding();
+
+ nsCOMPtr<nsIDocShellTreeItem> treeItem(document->GetDocShell());
+ if (!treeItem) return KeyBinding();
+
+ nsresult rv = NS_ERROR_FAILURE;
+ int32_t modifierMask = 0;
+ switch (treeItem->ItemType()) {
+ case nsIDocShellTreeItem::typeChrome:
+ modifierMask = StaticPrefs::ui_key_chromeAccess();
+ rv = NS_OK;
+ break;
+ case nsIDocShellTreeItem::typeContent:
+ modifierMask = StaticPrefs::ui_key_contentAccess();
+ rv = NS_OK;
+ break;
+ }
+
+ return NS_SUCCEEDED(rv) ? KeyBinding(key, modifierMask) : KeyBinding();
+}
+
+KeyBinding LocalAccessible::KeyboardShortcut() const { return KeyBinding(); }
+
+uint64_t LocalAccessible::VisibilityState() const {
+ if (IPCAccessibilityActive()) {
+ // Visibility states must be calculated by RemoteAccessible, so there's no
+ // point calculating them here.
+ return 0;
+ }
+ nsIFrame* frame = GetFrame();
+ if (!frame) {
+ // Element having display:contents is considered visible semantically,
+ // despite it doesn't have a visually visible box.
+ if (nsCoreUtils::IsDisplayContents(mContent)) {
+ return states::OFFSCREEN;
+ }
+ return states::INVISIBLE;
+ }
+
+ if (!frame->StyleVisibility()->IsVisible()) return states::INVISIBLE;
+
+ // It's invisible if the presshell is hidden by a visibility:hidden element in
+ // an ancestor document.
+ if (frame->PresShell()->IsUnderHiddenEmbedderElement()) {
+ return states::INVISIBLE;
+ }
+
+ // Offscreen state if the document's visibility state is not visible.
+ if (Document()->IsHidden()) return states::OFFSCREEN;
+
+ // Walk the parent frame chain to see if the frame is in background tab or
+ // scrolled out.
+ nsIFrame* curFrame = frame;
+ do {
+ nsView* view = curFrame->GetView();
+ if (view && view->GetVisibility() == ViewVisibility::Hide) {
+ return states::INVISIBLE;
+ }
+
+ if (nsLayoutUtils::IsPopup(curFrame)) {
+ return 0;
+ }
+
+ if (curFrame->StyleUIReset()->mMozSubtreeHiddenOnlyVisually) {
+ // Offscreen state for background tab content.
+ return states::OFFSCREEN;
+ }
+
+ nsIFrame* parentFrame = curFrame->GetParent();
+ // If contained by scrollable frame then check that at least 12 pixels
+ // around the object is visible, otherwise the object is offscreen.
+ nsIScrollableFrame* scrollableFrame = do_QueryFrame(parentFrame);
+ const nscoord kMinPixels = nsPresContext::CSSPixelsToAppUnits(12);
+ if (scrollableFrame) {
+ nsRect scrollPortRect = scrollableFrame->GetScrollPortRect();
+ nsRect frameRect = nsLayoutUtils::TransformFrameRectToAncestor(
+ frame, frame->GetRectRelativeToSelf(), parentFrame);
+ if (!scrollPortRect.Contains(frameRect)) {
+ scrollPortRect.Deflate(kMinPixels, kMinPixels);
+ if (!scrollPortRect.Intersects(frameRect)) return states::OFFSCREEN;
+ }
+ }
+
+ if (!parentFrame) {
+ parentFrame = nsLayoutUtils::GetCrossDocParentFrameInProcess(curFrame);
+ // Even if we couldn't find the parent frame, it might mean we are in an
+ // out-of-process iframe, try to see if |frame| is scrolled out in an
+ // scrollable frame in a cross-process ancestor document.
+ if (!parentFrame &&
+ nsLayoutUtils::FrameIsMostlyScrolledOutOfViewInCrossProcess(
+ frame, kMinPixels)) {
+ return states::OFFSCREEN;
+ }
+ }
+
+ curFrame = parentFrame;
+ } while (curFrame);
+
+ // Zero area rects can occur in the first frame of a multi-frame text flow,
+ // in which case the rendered text is not empty and the frame should not be
+ // marked invisible.
+ // XXX Can we just remove this check? Why do we need to mark empty
+ // text invisible?
+ if (frame->IsTextFrame() && !frame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) &&
+ frame->GetRect().IsEmpty()) {
+ nsIFrame::RenderedText text = frame->GetRenderedText(
+ 0, UINT32_MAX, nsIFrame::TextOffsetType::OffsetsInContentText,
+ nsIFrame::TrailingWhitespace::DontTrim);
+ if (text.mString.IsEmpty()) {
+ return states::INVISIBLE;
+ }
+ }
+
+ return 0;
+}
+
+uint64_t LocalAccessible::NativeState() const {
+ uint64_t state = 0;
+
+ if (!IsInDocument()) state |= states::STALE;
+
+ if (HasOwnContent() && mContent->IsElement()) {
+ dom::ElementState elementState = mContent->AsElement()->State();
+
+ if (elementState.HasState(dom::ElementState::INVALID)) {
+ state |= states::INVALID;
+ }
+
+ if (elementState.HasState(dom::ElementState::REQUIRED)) {
+ state |= states::REQUIRED;
+ }
+
+ state |= NativeInteractiveState();
+ }
+
+ // Gather states::INVISIBLE and states::OFFSCREEN flags for this object.
+ state |= VisibilityState();
+
+ nsIFrame* frame = GetFrame();
+ if (frame && frame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
+ state |= states::FLOATING;
+ }
+
+ // Check if a XUL element has the popup attribute (an attached popup menu).
+ if (HasOwnContent() && mContent->IsXULElement() &&
+ mContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::popup)) {
+ state |= states::HASPOPUP;
+ }
+
+ // Bypass the link states specialization for non links.
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (!roleMapEntry || roleMapEntry->roleRule == kUseNativeRole ||
+ roleMapEntry->role == roles::LINK) {
+ state |= NativeLinkState();
+ }
+
+ return state;
+}
+
+uint64_t LocalAccessible::NativeInteractiveState() const {
+ if (!mContent->IsElement()) return 0;
+
+ if (NativelyUnavailable()) return states::UNAVAILABLE;
+
+ nsIFrame* frame = GetFrame();
+ // If we're caching this remote document in the parent process, we
+ // need to cache focusability irrespective of visibility. Otherwise,
+ // if this document is invisible when it first loads, we'll cache that
+ // all descendants are unfocusable and this won't get updated when the
+ // document becomes visible. Even if we did get notified when the
+ // document becomes visible, it would be wasteful to walk the entire
+ // tree to figure out what is now focusable and push cache updates.
+ // Although ignoring visibility means IsFocusable will return true for
+ // visibility: hidden, etc., this isn't a problem because we don't include
+ // those hidden elements in the a11y tree anyway.
+ const bool ignoreVisibility = mDoc->IPCDoc();
+ if (frame && frame->IsFocusable(
+ /* aWithMouse */ false,
+ /* aCheckVisibility */ !ignoreVisibility)) {
+ return states::FOCUSABLE;
+ }
+
+ return 0;
+}
+
+uint64_t LocalAccessible::NativeLinkState() const { return 0; }
+
+bool LocalAccessible::NativelyUnavailable() const {
+ if (mContent->IsHTMLElement()) return mContent->AsElement()->IsDisabled();
+
+ return mContent->IsElement() && mContent->AsElement()->AttrValueIs(
+ kNameSpaceID_None, nsGkAtoms::disabled,
+ nsGkAtoms::_true, eCaseMatters);
+}
+
+Accessible* LocalAccessible::ChildAtPoint(int32_t aX, int32_t aY,
+ EWhichChildAtPoint aWhichChild) {
+ Accessible* child = LocalChildAtPoint(aX, aY, aWhichChild);
+ if (aWhichChild != EWhichChildAtPoint::DirectChild && child &&
+ child->IsOuterDoc()) {
+ child = child->ChildAtPoint(aX, aY, aWhichChild);
+ }
+
+ return child;
+}
+
+LocalAccessible* LocalAccessible::LocalChildAtPoint(
+ int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) {
+ // If we can't find the point in a child, we will return the fallback answer:
+ // we return |this| if the point is within it, otherwise nullptr.
+ LocalAccessible* fallbackAnswer = nullptr;
+ LayoutDeviceIntRect rect = Bounds();
+ if (rect.Contains(aX, aY)) fallbackAnswer = this;
+
+ if (nsAccUtils::MustPrune(this)) { // Do not dig any further
+ return fallbackAnswer;
+ }
+
+ // Search an accessible at the given point starting from accessible document
+ // because containing block (see CSS2) for out of flow element (for example,
+ // absolutely positioned element) may be different from its DOM parent and
+ // therefore accessible for containing block may be different from accessible
+ // for DOM parent but GetFrameForPoint() should be called for containing block
+ // to get an out of flow element.
+ DocAccessible* accDocument = Document();
+ NS_ENSURE_TRUE(accDocument, nullptr);
+
+ nsIFrame* rootFrame = accDocument->GetFrame();
+ NS_ENSURE_TRUE(rootFrame, nullptr);
+
+ nsIFrame* startFrame = rootFrame;
+
+ // Check whether the point is at popup content.
+ nsIWidget* rootWidget = rootFrame->GetView()->GetNearestWidget(nullptr);
+ NS_ENSURE_TRUE(rootWidget, nullptr);
+
+ LayoutDeviceIntRect rootRect = rootWidget->GetScreenBounds();
+
+ auto point = LayoutDeviceIntPoint(aX - rootRect.X(), aY - rootRect.Y());
+
+ nsIFrame* popupFrame = nsLayoutUtils::GetPopupFrameForPoint(
+ accDocument->PresContext()->GetRootPresContext(), rootWidget, point);
+ if (popupFrame) {
+ // If 'this' accessible is not inside the popup then ignore the popup when
+ // searching an accessible at point.
+ DocAccessible* popupDoc =
+ GetAccService()->GetDocAccessible(popupFrame->GetContent()->OwnerDoc());
+ LocalAccessible* popupAcc =
+ popupDoc->GetAccessibleOrContainer(popupFrame->GetContent());
+ LocalAccessible* popupChild = this;
+ while (popupChild && !popupChild->IsDoc() && popupChild != popupAcc) {
+ popupChild = popupChild->LocalParent();
+ }
+
+ if (popupChild == popupAcc) startFrame = popupFrame;
+ }
+
+ nsPresContext* presContext = startFrame->PresContext();
+ nsRect screenRect = startFrame->GetScreenRectInAppUnits();
+ nsPoint offset(presContext->DevPixelsToAppUnits(aX) - screenRect.X(),
+ presContext->DevPixelsToAppUnits(aY) - screenRect.Y());
+
+ nsIFrame* foundFrame = nsLayoutUtils::GetFrameForPoint(
+ RelativeTo{startFrame, ViewportType::Visual}, offset);
+
+ nsIContent* content = nullptr;
+ if (!foundFrame || !(content = foundFrame->GetContent())) {
+ return fallbackAnswer;
+ }
+
+ // Get accessible for the node with the point or the first accessible in
+ // the DOM parent chain.
+ DocAccessible* contentDocAcc =
+ GetAccService()->GetDocAccessible(content->OwnerDoc());
+
+ // contentDocAcc in some circumstances can be nullptr. See bug 729861
+ NS_ASSERTION(contentDocAcc, "could not get the document accessible");
+ if (!contentDocAcc) return fallbackAnswer;
+
+ LocalAccessible* accessible =
+ contentDocAcc->GetAccessibleOrContainer(content);
+ if (!accessible) return fallbackAnswer;
+
+ // Hurray! We have an accessible for the frame that layout gave us.
+ // Since DOM node of obtained accessible may be out of flow then we should
+ // ensure obtained accessible is a child of this accessible.
+ LocalAccessible* child = accessible;
+ while (child != this) {
+ LocalAccessible* parent = child->LocalParent();
+ if (!parent) {
+ // Reached the top of the hierarchy. These bounds were inside an
+ // accessible that is not a descendant of this one.
+ return fallbackAnswer;
+ }
+
+ // If we landed on a legitimate child of |this|, and we want the direct
+ // child, return it here.
+ if (parent == this && aWhichChild == EWhichChildAtPoint::DirectChild) {
+ return child;
+ }
+
+ child = parent;
+ }
+
+ // Manually walk through accessible children and see if the are within this
+ // point. Skip offscreen or invisible accessibles. This takes care of cases
+ // where layout won't walk into things for us, such as image map areas and
+ // sub documents (XXX: subdocuments should be handled by methods of
+ // OuterDocAccessibles).
+ uint32_t childCount = accessible->ChildCount();
+ if (childCount == 1 && accessible->IsOuterDoc() &&
+ accessible->FirstChild()->IsRemote()) {
+ // No local children.
+ return accessible;
+ }
+ for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
+ LocalAccessible* child = accessible->LocalChildAt(childIdx);
+
+ LayoutDeviceIntRect childRect = child->Bounds();
+ if (childRect.Contains(aX, aY) &&
+ (child->State() & states::INVISIBLE) == 0) {
+ if (aWhichChild == EWhichChildAtPoint::DeepestChild) {
+ return child->LocalChildAtPoint(aX, aY,
+ EWhichChildAtPoint::DeepestChild);
+ }
+
+ return child;
+ }
+ }
+
+ return accessible;
+}
+
+nsIFrame* LocalAccessible::FindNearestAccessibleAncestorFrame() {
+ nsIFrame* frame = GetFrame();
+ if (frame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
+ nsLayoutUtils::IsReallyFixedPos(frame)) {
+ return mDoc->PresShellPtr()->GetRootFrame();
+ }
+
+ if (IsDoc()) {
+ // We bound documents by their own frame, which is their PresShell's root
+ // frame. We cache the document offset elsewhere in BundleFieldsForCache
+ // using the nsGkAtoms::crossorigin attribute.
+ MOZ_ASSERT(frame, "DocAccessibles should always have a frame");
+ return frame;
+ }
+
+ // Iterate through accessible's ancestors to find one with a frame.
+ LocalAccessible* ancestor = mParent;
+ while (ancestor) {
+ if (nsIFrame* boundingFrame = ancestor->GetFrame()) {
+ return boundingFrame;
+ }
+ ancestor = ancestor->LocalParent();
+ }
+
+ MOZ_ASSERT_UNREACHABLE("No ancestor with frame?");
+ return nsLayoutUtils::GetContainingBlockForClientRect(frame);
+}
+
+nsRect LocalAccessible::ParentRelativeBounds() {
+ nsIFrame* frame = GetFrame();
+ if (frame && mContent) {
+ nsIFrame* boundingFrame = FindNearestAccessibleAncestorFrame();
+ nsRect result = nsLayoutUtils::GetAllInFlowRectsUnion(frame, boundingFrame);
+
+ if (result.IsEmpty()) {
+ // If we end up with a 0x0 rect from above (or one with negative
+ // height/width) we should try using the ink overflow rect instead. If we
+ // use this rect, our relative bounds will match the bounds of what
+ // appears visually. We do this because some web authors (icloud.com for
+ // example) employ things like 0x0 buttons with visual overflow. Without
+ // this, such frames aren't navigable by screen readers.
+ result = frame->InkOverflowRectRelativeToSelf();
+ result.MoveBy(frame->GetOffsetTo(boundingFrame));
+ }
+
+ if (boundingFrame->GetRect().IsEmpty()) {
+ // boundingFrame might be the first in an ib-split-sibling chain. If its
+ // rect is empty, GetAllInFlowRectsUnion might exclude its origin. For
+ // example, if boundingFrame is empty with an origin of (0, -840) but
+ // has a non-empty ib-split-sibling with (0, 0), the union rect will
+ // originate at (0, 0). This means the bounds returned for our parent
+ // Accessible might be offset from boundingFrame's rect. Since result is
+ // currently relative to boundingFrame's rect, we might need to adjust it
+ // to make it parent relative.
+ nsRect boundingUnion =
+ nsLayoutUtils::GetAllInFlowRectsUnion(boundingFrame, boundingFrame);
+ if (!boundingUnion.IsEmpty()) {
+ result.MoveBy(-boundingUnion.TopLeft());
+ } else {
+ // Since GetAllInFlowRectsUnion returned an empty rect on our parent
+ // Accessible, we would have used the ink overflow rect. However,
+ // GetAllInFlowRectsUnion calculates relative to the bounding frame's
+ // main rect, not its ink overflow rect. We need to adjust for the ink
+ // overflow offset to make our result parent relative.
+ nsRect boundingOverflow =
+ boundingFrame->InkOverflowRectRelativeToSelf();
+ result.MoveBy(-boundingOverflow.TopLeft());
+ }
+ }
+
+ if (frame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
+ nsLayoutUtils::IsReallyFixedPos(frame)) {
+ // If we're dealing with a fixed position frame, we've already made it
+ // relative to the document which should have gotten rid of its scroll
+ // offset.
+ return result;
+ }
+
+ if (nsIScrollableFrame* sf =
+ mParent == mDoc
+ ? mDoc->PresShellPtr()->GetRootScrollFrameAsScrollable()
+ : boundingFrame->GetScrollTargetFrame()) {
+ // If boundingFrame has a scroll position, result is currently relative
+ // to that. Instead, we want result to remain the same regardless of
+ // scrolling. We then subtract the scroll position later when
+ // calculating absolute bounds. We do this because we don't want to push
+ // cache updates for the bounds of all descendants every time we scroll.
+ nsPoint scrollPos = sf->GetScrollPosition().ApplyResolution(
+ mDoc->PresShellPtr()->GetResolution());
+ result.MoveBy(scrollPos.x, scrollPos.y);
+ }
+
+ return result;
+ }
+
+ return nsRect();
+}
+
+nsRect LocalAccessible::RelativeBounds(nsIFrame** aBoundingFrame) const {
+ nsIFrame* frame = GetFrame();
+ if (frame && mContent) {
+ *aBoundingFrame = nsLayoutUtils::GetContainingBlockForClientRect(frame);
+ nsRect unionRect = nsLayoutUtils::GetAllInFlowRectsUnion(
+ frame, *aBoundingFrame, nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS);
+
+ if (unionRect.IsEmpty()) {
+ // If we end up with a 0x0 rect from above (or one with negative
+ // height/width) we should try using the ink overflow rect instead. If we
+ // use this rect, our relative bounds will match the bounds of what
+ // appears visually. We do this because some web authors (icloud.com for
+ // example) employ things like 0x0 buttons with visual overflow. Without
+ // this, such frames aren't navigable by screen readers.
+ nsRect overflow = frame->InkOverflowRectRelativeToSelf();
+ nsLayoutUtils::TransformRect(frame, *aBoundingFrame, overflow);
+ return overflow;
+ }
+
+ return unionRect;
+ }
+
+ return nsRect();
+}
+
+nsRect LocalAccessible::BoundsInAppUnits() const {
+ nsIFrame* boundingFrame = nullptr;
+ nsRect unionRectTwips = RelativeBounds(&boundingFrame);
+ if (!boundingFrame) {
+ return nsRect();
+ }
+
+ PresShell* presShell = mDoc->PresContext()->PresShell();
+
+ // We need to inverse translate with the offset of the edge of the visual
+ // viewport from top edge of the layout viewport.
+ nsPoint viewportOffset = presShell->GetVisualViewportOffset() -
+ presShell->GetLayoutViewportOffset();
+ unionRectTwips.MoveBy(-viewportOffset);
+
+ // We need to take into account a non-1 resolution set on the presshell.
+ // This happens with async pinch zooming. Here we scale the bounds before
+ // adding the screen-relative offset.
+ unionRectTwips.ScaleRoundOut(presShell->GetResolution());
+ // We have the union of the rectangle, now we need to put it in absolute
+ // screen coords.
+ nsRect orgRectPixels = boundingFrame->GetScreenRectInAppUnits();
+ unionRectTwips.MoveBy(orgRectPixels.X(), orgRectPixels.Y());
+
+ return unionRectTwips;
+}
+
+LayoutDeviceIntRect LocalAccessible::Bounds() const {
+ return LayoutDeviceIntRect::FromAppUnitsToNearest(
+ BoundsInAppUnits(), mDoc->PresContext()->AppUnitsPerDevPixel());
+}
+
+void LocalAccessible::SetSelected(bool aSelect) {
+ if (!HasOwnContent()) return;
+
+ LocalAccessible* select = nsAccUtils::GetSelectableContainer(this, State());
+ if (select) {
+ if (select->State() & states::MULTISELECTABLE) {
+ if (mContent->IsElement() && ARIARoleMap()) {
+ if (aSelect) {
+ mContent->AsElement()->SetAttr(
+ kNameSpaceID_None, nsGkAtoms::aria_selected, u"true"_ns, true);
+ } else {
+ mContent->AsElement()->UnsetAttr(kNameSpaceID_None,
+ nsGkAtoms::aria_selected, true);
+ }
+ }
+ return;
+ }
+
+ if (aSelect) TakeFocus();
+ }
+}
+
+void LocalAccessible::TakeSelection() {
+ LocalAccessible* select = nsAccUtils::GetSelectableContainer(this, State());
+ if (select) {
+ if (select->State() & states::MULTISELECTABLE) select->UnselectAll();
+ SetSelected(true);
+ }
+}
+
+void LocalAccessible::TakeFocus() const {
+ nsIFrame* frame = GetFrame();
+ if (!frame) return;
+
+ nsIContent* focusContent = mContent;
+
+ // If the accessible focus is managed by container widget then focus the
+ // widget and set the accessible as its current item.
+ if (!frame->IsFocusable()) {
+ LocalAccessible* widget = ContainerWidget();
+ if (widget && widget->AreItemsOperable()) {
+ nsIContent* widgetElm = widget->GetContent();
+ nsIFrame* widgetFrame = widgetElm->GetPrimaryFrame();
+ if (widgetFrame && widgetFrame->IsFocusable()) {
+ focusContent = widgetElm;
+ widget->SetCurrentItem(this);
+ }
+ }
+ }
+
+ if (RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager()) {
+ dom::AutoHandlingUserInputStatePusher inputStatePusher(true);
+ // XXXbz: Can we actually have a non-element content here?
+ RefPtr<dom::Element> element = dom::Element::FromNodeOrNull(focusContent);
+ fm->SetFocus(element, 0);
+ }
+}
+
+void LocalAccessible::NameFromAssociatedXULLabel(DocAccessible* aDocument,
+ nsIContent* aElm,
+ nsString& aName) {
+ LocalAccessible* label = nullptr;
+ XULLabelIterator iter(aDocument, aElm);
+ while ((label = iter.Next())) {
+ // Check if label's value attribute is used
+ label->Elm()->GetAttr(kNameSpaceID_None, nsGkAtoms::value, aName);
+ if (aName.IsEmpty()) {
+ // If no value attribute, a non-empty label must contain
+ // children that define its text -- possibly using HTML
+ nsTextEquivUtils::AppendTextEquivFromContent(label, label->Elm(), &aName);
+ }
+ }
+ aName.CompressWhitespace();
+}
+
+void LocalAccessible::XULElmName(DocAccessible* aDocument, nsIContent* aElm,
+ nsString& aName) {
+ /**
+ * 3 main cases for XUL Controls to be labeled
+ * 1 - control contains label="foo"
+ * 2 - non-child label contains control="controlID"
+ * - label has either value="foo" or children
+ * 3 - name from subtree; e.g. a child label element
+ * Cases 1 and 2 are handled here.
+ * Case 3 is handled by GetNameFromSubtree called in NativeName.
+ * Once a label is found, the search is discontinued, so a control
+ * that has a label attribute as well as having a label external to
+ * the control that uses the control="controlID" syntax will use
+ * the label attribute for its Name.
+ */
+
+ // CASE #1 (via label attribute) -- great majority of the cases
+ // Only do this if this is not a select control element, which uses label
+ // attribute to indicate, which option is selected.
+ nsCOMPtr<nsIDOMXULSelectControlElement> select =
+ aElm->AsElement()->AsXULSelectControl();
+ if (!select) {
+ aElm->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::label, aName);
+ }
+
+ // CASE #2 -- label as <label control="id" ... ></label>
+ if (aName.IsEmpty()) {
+ NameFromAssociatedXULLabel(aDocument, aElm, aName);
+ }
+
+ aName.CompressWhitespace();
+}
+
+nsresult LocalAccessible::HandleAccEvent(AccEvent* aEvent) {
+ NS_ENSURE_ARG_POINTER(aEvent);
+
+ if (profiler_thread_is_being_profiled_for_markers()) {
+ nsAutoCString strEventType;
+ GetAccService()->GetStringEventType(aEvent->GetEventType(), strEventType);
+ nsAutoCString strMarker;
+ strMarker.AppendLiteral("A11y Event - ");
+ strMarker.Append(strEventType);
+ PROFILER_MARKER_UNTYPED(strMarker, A11Y);
+ }
+
+ if (IPCAccessibilityActive() && Document()) {
+ DocAccessibleChild* ipcDoc = mDoc->IPCDoc();
+ // If ipcDoc is null, we can't fire the event to the client. We shouldn't
+ // have fired the event in the first place, since this makes events
+ // inconsistent for local and remote documents. To avoid this, don't call
+ // nsEventShell::FireEvent on a DocAccessible for which
+ // HasLoadState(eTreeConstructed) is false.
+ MOZ_ASSERT(ipcDoc);
+ if (ipcDoc) {
+ uint64_t id = aEvent->GetAccessible()->ID();
+
+ switch (aEvent->GetEventType()) {
+ case nsIAccessibleEvent::EVENT_SHOW:
+ ipcDoc->ShowEvent(downcast_accEvent(aEvent));
+ break;
+
+ case nsIAccessibleEvent::EVENT_HIDE:
+ ipcDoc->SendHideEvent(id, aEvent->IsFromUserInput());
+ break;
+
+ case nsIAccessibleEvent::EVENT_INNER_REORDER:
+ case nsIAccessibleEvent::EVENT_REORDER:
+ if (IsTable()) {
+ SendCache(CacheDomain::Table, CacheUpdateType::Update);
+ }
+
+#if defined(XP_WIN)
+ if (HasOwnContent() && mContent->IsMathMLElement()) {
+ // For any change in a MathML subtree, update the innerHTML cache on
+ // the root math element.
+ for (LocalAccessible* acc = this; acc; acc = acc->LocalParent()) {
+ if (acc->HasOwnContent() &&
+ acc->mContent->IsMathMLElement(nsGkAtoms::math)) {
+ mDoc->QueueCacheUpdate(acc, CacheDomain::InnerHTML);
+ }
+ }
+ }
+#endif // defined(XP_WIN)
+
+ // reorder events on the application acc aren't necessary to tell the
+ // parent about new top level documents.
+ if (!aEvent->GetAccessible()->IsApplication()) {
+ ipcDoc->SendEvent(id, aEvent->GetEventType());
+ }
+ break;
+ case nsIAccessibleEvent::EVENT_STATE_CHANGE: {
+ AccStateChangeEvent* event = downcast_accEvent(aEvent);
+ ipcDoc->SendStateChangeEvent(id, event->GetState(),
+ event->IsStateEnabled());
+ break;
+ }
+ case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
+ AccCaretMoveEvent* event = downcast_accEvent(aEvent);
+ ipcDoc->SendCaretMoveEvent(
+ id, event->GetCaretOffset(), event->IsSelectionCollapsed(),
+ event->IsAtEndOfLine(), event->GetGranularity());
+ break;
+ }
+ case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
+ case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
+ AccTextChangeEvent* event = downcast_accEvent(aEvent);
+ const nsString& text = event->ModifiedText();
+ ipcDoc->SendTextChangeEvent(
+ id, text, event->GetStartOffset(), event->GetLength(),
+ event->IsTextInserted(), event->IsFromUserInput());
+ break;
+ }
+ case nsIAccessibleEvent::EVENT_SELECTION:
+ case nsIAccessibleEvent::EVENT_SELECTION_ADD:
+ case nsIAccessibleEvent::EVENT_SELECTION_REMOVE: {
+ AccSelChangeEvent* selEvent = downcast_accEvent(aEvent);
+ ipcDoc->SendSelectionEvent(id, selEvent->Widget()->ID(),
+ aEvent->GetEventType());
+ break;
+ }
+ case nsIAccessibleEvent::EVENT_VIRTUALCURSOR_CHANGED: {
+ AccVCChangeEvent* vcEvent = downcast_accEvent(aEvent);
+ LocalAccessible* position = vcEvent->NewAccessible();
+ LocalAccessible* oldPosition = vcEvent->OldAccessible();
+ ipcDoc->SendVirtualCursorChangeEvent(
+ id, oldPosition ? oldPosition->ID() : 0,
+ vcEvent->OldStartOffset(), vcEvent->OldEndOffset(),
+ position ? position->ID() : 0, vcEvent->NewStartOffset(),
+ vcEvent->NewEndOffset(), vcEvent->Reason(),
+ vcEvent->BoundaryType(), vcEvent->IsFromUserInput());
+ break;
+ }
+#if defined(XP_WIN)
+ case nsIAccessibleEvent::EVENT_FOCUS: {
+ ipcDoc->SendFocusEvent(id);
+ break;
+ }
+#endif
+ case nsIAccessibleEvent::EVENT_SCROLLING_END:
+ case nsIAccessibleEvent::EVENT_SCROLLING: {
+ AccScrollingEvent* scrollingEvent = downcast_accEvent(aEvent);
+ ipcDoc->SendScrollingEvent(
+ id, aEvent->GetEventType(), scrollingEvent->ScrollX(),
+ scrollingEvent->ScrollY(), scrollingEvent->MaxScrollX(),
+ scrollingEvent->MaxScrollY());
+ break;
+ }
+#if !defined(XP_WIN)
+ case nsIAccessibleEvent::EVENT_ANNOUNCEMENT: {
+ AccAnnouncementEvent* announcementEvent = downcast_accEvent(aEvent);
+ ipcDoc->SendAnnouncementEvent(id, announcementEvent->Announcement(),
+ announcementEvent->Priority());
+ break;
+ }
+#endif // !defined(XP_WIN)
+ case nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED: {
+ AccTextSelChangeEvent* textSelChangeEvent = downcast_accEvent(aEvent);
+ AutoTArray<TextRange, 1> ranges;
+ textSelChangeEvent->SelectionRanges(&ranges);
+ nsTArray<TextRangeData> textRangeData(ranges.Length());
+ for (size_t i = 0; i < ranges.Length(); i++) {
+ const TextRange& range = ranges.ElementAt(i);
+ LocalAccessible* start = range.StartContainer()->AsLocal();
+ LocalAccessible* end = range.EndContainer()->AsLocal();
+ textRangeData.AppendElement(TextRangeData(start->ID(), end->ID(),
+ range.StartOffset(),
+ range.EndOffset()));
+ }
+ ipcDoc->SendTextSelectionChangeEvent(id, textRangeData);
+ break;
+ }
+ case nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE:
+ case nsIAccessibleEvent::EVENT_NAME_CHANGE: {
+ SendCache(CacheDomain::NameAndDescription, CacheUpdateType::Update);
+ ipcDoc->SendEvent(id, aEvent->GetEventType());
+ break;
+ }
+ case nsIAccessibleEvent::EVENT_TEXT_VALUE_CHANGE:
+ case nsIAccessibleEvent::EVENT_VALUE_CHANGE: {
+ SendCache(CacheDomain::Value, CacheUpdateType::Update);
+ ipcDoc->SendEvent(id, aEvent->GetEventType());
+ break;
+ }
+ default:
+ ipcDoc->SendEvent(id, aEvent->GetEventType());
+ }
+ }
+ }
+
+ if (nsCoreUtils::AccEventObserversExist()) {
+ nsCoreUtils::DispatchAccEvent(MakeXPCEvent(aEvent));
+ }
+
+ return NS_OK;
+}
+
+already_AddRefed<AccAttributes> LocalAccessible::Attributes() {
+ RefPtr<AccAttributes> attributes = NativeAttributes();
+ if (!HasOwnContent() || !mContent->IsElement()) return attributes.forget();
+
+ // 'xml-roles' attribute coming from ARIA.
+ nsString xmlRoles;
+ if (nsAccUtils::GetARIAAttr(mContent->AsElement(), nsGkAtoms::role,
+ xmlRoles) &&
+ !xmlRoles.IsEmpty()) {
+ attributes->SetAttribute(nsGkAtoms::xmlroles, std::move(xmlRoles));
+ } else if (nsAtom* landmark = LandmarkRole()) {
+ // 'xml-roles' attribute for landmark.
+ attributes->SetAttribute(nsGkAtoms::xmlroles, landmark);
+ }
+
+ // Expose object attributes from ARIA attributes.
+ aria::AttrIterator attribIter(mContent);
+ while (attribIter.Next()) {
+ if (attribIter.AttrName() == nsGkAtoms::aria_placeholder &&
+ attributes->HasAttribute(nsGkAtoms::placeholder)) {
+ // If there is an HTML placeholder attribute exposed by
+ // HTMLTextFieldAccessible::NativeAttributes, don't expose
+ // aria-placeholder.
+ continue;
+ }
+ attribIter.ExposeAttr(attributes);
+ }
+
+ // If there is no aria-live attribute then expose default value of 'live'
+ // object attribute used for ARIA role of this accessible.
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (roleMapEntry) {
+ if (roleMapEntry->Is(nsGkAtoms::searchbox)) {
+ attributes->SetAttribute(nsGkAtoms::textInputType, nsGkAtoms::search);
+ }
+
+ if (!attributes->HasAttribute(nsGkAtoms::aria_live)) {
+ nsString live;
+ if (nsAccUtils::GetLiveAttrValue(roleMapEntry->liveAttRule, live)) {
+ attributes->SetAttribute(nsGkAtoms::aria_live, std::move(live));
+ }
+ }
+ }
+
+ return attributes.forget();
+}
+
+already_AddRefed<AccAttributes> LocalAccessible::NativeAttributes() {
+ RefPtr<AccAttributes> attributes = new AccAttributes();
+
+ // We support values, so expose the string value as well, via the valuetext
+ // object attribute. We test for the value interface because we don't want
+ // to expose traditional Value() information such as URL's on links and
+ // documents, or text in an input.
+ if (HasNumericValue()) {
+ nsString valuetext;
+ Value(valuetext);
+ attributes->SetAttribute(nsGkAtoms::aria_valuetext, std::move(valuetext));
+ }
+
+ // Expose checkable object attribute if the accessible has checkable state
+ if (State() & states::CHECKABLE) {
+ attributes->SetAttribute(nsGkAtoms::checkable, true);
+ }
+
+ // Expose 'explicit-name' attribute.
+ nsAutoString name;
+ if (Name(name) != eNameFromSubtree && !name.IsVoid()) {
+ attributes->SetAttribute(nsGkAtoms::explicit_name, true);
+ }
+
+ // Group attributes (level/setsize/posinset)
+ GroupPos groupPos = GroupPosition();
+ nsAccUtils::SetAccGroupAttrs(attributes, groupPos.level, groupPos.setSize,
+ groupPos.posInSet);
+
+ bool hierarchical = false;
+ uint32_t itemCount = AccGroupInfo::TotalItemCount(this, &hierarchical);
+ if (itemCount) {
+ attributes->SetAttribute(nsGkAtoms::child_item_count,
+ static_cast<int32_t>(itemCount));
+ }
+
+ if (hierarchical) {
+ attributes->SetAttribute(nsGkAtoms::tree, true);
+ }
+
+ // If the accessible doesn't have own content (such as list item bullet or
+ // xul tree item) then don't calculate content based attributes.
+ if (!HasOwnContent()) return attributes.forget();
+
+ nsEventShell::GetEventAttributes(GetNode(), attributes);
+
+ // Get container-foo computed live region properties based on the closest
+ // container with the live region attribute. Inner nodes override outer nodes
+ // within the same document. The inner nodes can be used to override live
+ // region behavior on more general outer nodes.
+ nsAccUtils::SetLiveContainerAttributes(attributes, this);
+
+ if (!mContent->IsElement()) return attributes.forget();
+
+ nsString id;
+ if (nsCoreUtils::GetID(mContent, id)) {
+ attributes->SetAttribute(nsGkAtoms::id, std::move(id));
+ }
+
+ // Expose class because it may have useful microformat information.
+ nsString _class;
+ if (mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::_class,
+ _class)) {
+ attributes->SetAttribute(nsGkAtoms::_class, std::move(_class));
+ }
+
+ // Expose tag.
+ attributes->SetAttribute(nsGkAtoms::tag, mContent->NodeInfo()->NameAtom());
+
+ // Expose draggable object attribute.
+ if (auto htmlElement = nsGenericHTMLElement::FromNode(mContent)) {
+ if (htmlElement->Draggable()) {
+ attributes->SetAttribute(nsGkAtoms::draggable, true);
+ }
+ }
+
+ // Don't calculate CSS-based object attributes when:
+ // 1. There is no frame (e.g. the accessible is unattached from the tree).
+ // 2. This is an image map area. CSS is irrelevant here. Furthermore, we won't
+ // be able to get the computed style if the map is unslotted in a shadow host.
+ nsIFrame* f = mContent->GetPrimaryFrame();
+ if (!f || mContent->IsHTMLElement(nsGkAtoms::area)) {
+ return attributes.forget();
+ }
+
+ const ComputedStyle& style = *f->Style();
+ auto Atomize = [&](nsCSSPropertyID aId) -> RefPtr<nsAtom> {
+ nsAutoCString value;
+ style.GetComputedPropertyValue(aId, value);
+ return NS_Atomize(value);
+ };
+
+ // Expose 'display' attribute.
+ attributes->SetAttribute(nsGkAtoms::display, Atomize(eCSSProperty_display));
+
+ // Expose 'text-align' attribute.
+ attributes->SetAttribute(nsGkAtoms::textAlign,
+ Atomize(eCSSProperty_text_align));
+
+ // Expose 'text-indent' attribute.
+ // XXX how does whatever reads this whether this was a percentage or a length?
+ const LengthPercentage& textIndent = f->StyleText()->mTextIndent;
+ if (textIndent.ConvertsToLength()) {
+ attributes->SetAttribute(nsGkAtoms::textIndent,
+ textIndent.ToLengthInCSSPixels());
+ } else if (textIndent.ConvertsToPercentage()) {
+ attributes->SetAttribute(nsGkAtoms::textIndent, textIndent.ToPercentage());
+ }
+
+ auto GetMargin = [&](mozilla::Side aSide) -> CSSCoord {
+ // This is here only to guarantee that we do the same as getComputedStyle
+ // does, so that we don't hit precision errors in tests.
+ auto& margin = f->StyleMargin()->mMargin.Get(aSide);
+ if (margin.ConvertsToLength()) {
+ return margin.AsLengthPercentage().ToLengthInCSSPixels();
+ }
+
+ nscoord coordVal = f->GetUsedMargin().Side(aSide);
+ return CSSPixel::FromAppUnits(coordVal);
+ };
+
+ // Expose 'margin-left' attribute.
+ attributes->SetAttribute(nsGkAtoms::marginLeft, GetMargin(eSideLeft));
+
+ // Expose 'margin-right' attribute.
+ attributes->SetAttribute(nsGkAtoms::marginRight, GetMargin(eSideRight));
+
+ // Expose 'margin-top' attribute.
+ attributes->SetAttribute(nsGkAtoms::marginTop, GetMargin(eSideTop));
+
+ // Expose 'margin-bottom' attribute.
+ attributes->SetAttribute(nsGkAtoms::marginBottom, GetMargin(eSideBottom));
+
+ // Expose data-at-shortcutkeys attribute for web applications and virtual
+ // cursors. Currently mostly used by JAWS.
+ nsString atShortcutKeys;
+ if (mContent->AsElement()->GetAttr(
+ kNameSpaceID_None, nsGkAtoms::dataAtShortcutkeys, atShortcutKeys)) {
+ attributes->SetAttribute(nsGkAtoms::dataAtShortcutkeys,
+ std::move(atShortcutKeys));
+ }
+
+ return attributes.forget();
+}
+
+bool LocalAccessible::AttributeChangesState(nsAtom* aAttribute) {
+ return aAttribute == nsGkAtoms::aria_disabled ||
+ aAttribute == nsGkAtoms::disabled ||
+ aAttribute == nsGkAtoms::tabindex ||
+ aAttribute == nsGkAtoms::aria_required ||
+ aAttribute == nsGkAtoms::aria_invalid ||
+ aAttribute == nsGkAtoms::aria_expanded ||
+ aAttribute == nsGkAtoms::aria_checked ||
+ (aAttribute == nsGkAtoms::aria_pressed && IsButton()) ||
+ aAttribute == nsGkAtoms::aria_readonly ||
+ aAttribute == nsGkAtoms::aria_current ||
+ aAttribute == nsGkAtoms::aria_haspopup ||
+ aAttribute == nsGkAtoms::aria_busy ||
+ aAttribute == nsGkAtoms::aria_multiline ||
+ aAttribute == nsGkAtoms::aria_multiselectable ||
+ aAttribute == nsGkAtoms::contenteditable;
+}
+
+void LocalAccessible::DOMAttributeChanged(int32_t aNameSpaceID,
+ nsAtom* aAttribute, int32_t aModType,
+ const nsAttrValue* aOldValue,
+ uint64_t aOldState) {
+ // Fire accessible event after short timer, because we need to wait for
+ // DOM attribute & resulting layout to actually change. Otherwise,
+ // assistive technology will retrieve the wrong state/value/selection info.
+
+ // XXX todo
+ // We still need to handle special HTML cases here
+ // For example, if an <img>'s usemap attribute is modified
+ // Otherwise it may just be a state change, for example an object changing
+ // its visibility
+ //
+ // XXX todo: report aria state changes for "undefined" literal value changes
+ // filed as bug 472142
+ //
+ // XXX todo: invalidate accessible when aria state changes affect exposed
+ // role filed as bug 472143
+
+ if (AttributeChangesState(aAttribute)) {
+ uint64_t currState = State();
+ uint64_t diffState = currState ^ aOldState;
+ if (diffState) {
+ for (uint64_t state = 1; state <= states::LAST_ENTRY; state <<= 1) {
+ if (diffState & state) {
+ RefPtr<AccEvent> stateChangeEvent =
+ new AccStateChangeEvent(this, state, (currState & state));
+ mDoc->FireDelayedEvent(stateChangeEvent);
+ }
+ }
+ }
+ }
+
+ if (aAttribute == nsGkAtoms::_class) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::DOMNodeIDAndClass);
+ return;
+ }
+
+ // When a details object has its open attribute changed
+ // we should fire a state-change event on the accessible of
+ // its main summary
+ if (aAttribute == nsGkAtoms::open) {
+ // FromDetails checks if the given accessible belongs to
+ // a details frame and also locates the accessible of its
+ // main summary.
+ if (HTMLSummaryAccessible* summaryAccessible =
+ HTMLSummaryAccessible::FromDetails(this)) {
+ RefPtr<AccEvent> expandedChangeEvent =
+ new AccStateChangeEvent(summaryAccessible, states::EXPANDED);
+ mDoc->FireDelayedEvent(expandedChangeEvent);
+ return;
+ }
+ }
+
+ // Check for namespaced ARIA attribute
+ if (aNameSpaceID == kNameSpaceID_None) {
+ // Check for hyphenated aria-foo property?
+ if (StringBeginsWith(nsDependentAtomString(aAttribute), u"aria-"_ns)) {
+ uint8_t attrFlags = aria::AttrCharacteristicsFor(aAttribute);
+ if (!(attrFlags & ATTR_BYPASSOBJ)) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::ARIA);
+ // For aria attributes like drag and drop changes we fire a generic
+ // attribute change event; at least until native API comes up with a
+ // more meaningful event.
+ RefPtr<AccEvent> event =
+ new AccObjectAttrChangedEvent(this, aAttribute);
+ mDoc->FireDelayedEvent(event);
+ }
+ }
+ }
+
+ dom::Element* elm = Elm();
+
+ if (HasNumericValue() &&
+ (aAttribute == nsGkAtoms::aria_valuemax ||
+ aAttribute == nsGkAtoms::aria_valuemin || aAttribute == nsGkAtoms::min ||
+ aAttribute == nsGkAtoms::max || aAttribute == nsGkAtoms::step)) {
+ SendCache(CacheDomain::Value, CacheUpdateType::Update);
+ return;
+ }
+
+ // Fire text value change event whenever aria-valuetext is changed.
+ if (aAttribute == nsGkAtoms::aria_valuetext) {
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_TEXT_VALUE_CHANGE, this);
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::aria_valuenow) {
+ if (!nsAccUtils::HasARIAAttr(elm, nsGkAtoms::aria_valuetext) ||
+ nsAccUtils::ARIAAttrValueIs(elm, nsGkAtoms::aria_valuetext,
+ nsGkAtoms::_empty, eCaseMatters)) {
+ // Fire numeric value change event when aria-valuenow is changed and
+ // aria-valuetext is empty
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_VALUE_CHANGE, this);
+ } else {
+ // We need to update the cache here since we won't get an event if
+ // aria-valuenow is shadowed by aria-valuetext.
+ SendCache(CacheDomain::Value, CacheUpdateType::Update);
+ }
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::aria_owns) {
+ mDoc->Controller()->ScheduleRelocation(this);
+ }
+
+ // Fire name change and description change events.
+ if (aAttribute == nsGkAtoms::aria_label) {
+ // A valid aria-labelledby would take precedence so an aria-label change
+ // won't change the name.
+ IDRefsIterator iter(mDoc, elm, nsGkAtoms::aria_labelledby);
+ if (!iter.NextElem()) {
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
+ }
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::aria_description) {
+ // A valid aria-describedby would take precedence so an aria-description
+ // change won't change the description.
+ IDRefsIterator iter(mDoc, elm, nsGkAtoms::aria_describedby);
+ if (!iter.NextElem()) {
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE,
+ this);
+ }
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::aria_describedby) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE, this);
+ if (aModType == dom::MutationEvent_Binding::MODIFICATION ||
+ aModType == dom::MutationEvent_Binding::ADDITION) {
+ // The subtrees of the new aria-describedby targets might be used to
+ // compute the description for this. Therefore, we need to set
+ // the eHasDescriptionDependent flag on all Accessibles in these subtrees.
+ IDRefsIterator iter(mDoc, elm, nsGkAtoms::aria_describedby);
+ while (LocalAccessible* target = iter.Next()) {
+ target->ModifySubtreeContextFlags(eHasDescriptionDependent, true);
+ }
+ }
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::aria_labelledby) {
+ // We only queue cache updates for explicit relations. Implicit, reverse
+ // relations are handled in ApplyCache and stored in a map on the remote
+ // document itself.
+ mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
+ if (aModType == dom::MutationEvent_Binding::MODIFICATION ||
+ aModType == dom::MutationEvent_Binding::ADDITION) {
+ // The subtrees of the new aria-labelledby targets might be used to
+ // compute the name for this. Therefore, we need to set
+ // the eHasNameDependent flag on all Accessibles in these subtrees.
+ IDRefsIterator iter(mDoc, elm, nsGkAtoms::aria_labelledby);
+ while (LocalAccessible* target = iter.Next()) {
+ target->ModifySubtreeContextFlags(eHasNameDependent, true);
+ }
+ }
+ return;
+ }
+
+ if ((aAttribute == nsGkAtoms::aria_expanded ||
+ aAttribute == nsGkAtoms::href) &&
+ (aModType == dom::MutationEvent_Binding::ADDITION ||
+ aModType == dom::MutationEvent_Binding::REMOVAL)) {
+ // The presence of aria-expanded adds an expand/collapse action.
+ SendCache(CacheDomain::Actions, CacheUpdateType::Update);
+ }
+
+ if (aAttribute == nsGkAtoms::href || aAttribute == nsGkAtoms::src) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::Value);
+ }
+
+ if (aAttribute == nsGkAtoms::aria_controls ||
+ aAttribute == nsGkAtoms::aria_flowto ||
+ aAttribute == nsGkAtoms::aria_details ||
+ aAttribute == nsGkAtoms::aria_errormessage) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
+ }
+
+ if (aAttribute == nsGkAtoms::alt &&
+ !nsAccUtils::HasARIAAttr(elm, nsGkAtoms::aria_label) &&
+ !elm->HasAttr(nsGkAtoms::aria_labelledby)) {
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::title) {
+ nsAutoString name;
+ ARIAName(name);
+ if (name.IsEmpty()) {
+ NativeName(name);
+ if (name.IsEmpty()) {
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
+ return;
+ }
+ }
+
+ if (!elm->HasAttr(nsGkAtoms::aria_describedby)) {
+ mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE,
+ this);
+ }
+
+ return;
+ }
+
+ // ARIA or XUL selection
+ if ((mContent->IsXULElement() && aAttribute == nsGkAtoms::selected) ||
+ aAttribute == nsGkAtoms::aria_selected) {
+ LocalAccessible* widget = nsAccUtils::GetSelectableContainer(this, State());
+ if (widget) {
+ AccSelChangeEvent::SelChangeType selChangeType;
+ if (aNameSpaceID != kNameSpaceID_None) {
+ selChangeType = elm->AttrValueIs(aNameSpaceID, aAttribute,
+ nsGkAtoms::_true, eCaseMatters)
+ ? AccSelChangeEvent::eSelectionAdd
+ : AccSelChangeEvent::eSelectionRemove;
+ } else {
+ selChangeType = nsAccUtils::ARIAAttrValueIs(
+ elm, aAttribute, nsGkAtoms::_true, eCaseMatters)
+ ? AccSelChangeEvent::eSelectionAdd
+ : AccSelChangeEvent::eSelectionRemove;
+ }
+
+ RefPtr<AccEvent> event =
+ new AccSelChangeEvent(widget, this, selChangeType);
+ mDoc->FireDelayedEvent(event);
+ if (aAttribute == nsGkAtoms::aria_selected) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::State);
+ }
+ }
+
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::aria_level ||
+ aAttribute == nsGkAtoms::aria_setsize ||
+ aAttribute == nsGkAtoms::aria_posinset) {
+ SendCache(CacheDomain::GroupInfo, CacheUpdateType::Update);
+ return;
+ }
+
+ if (aAttribute == nsGkAtoms::accesskey) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::Actions);
+ }
+
+ if (aAttribute == nsGkAtoms::name &&
+ (mContent && mContent->IsHTMLElement(nsGkAtoms::a))) {
+ // If an anchor's name changed, it's possible a LINKS_TO relation
+ // also changed. Push a cache update for Relations.
+ mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
+ }
+
+ if (aAttribute == nsGkAtoms::slot &&
+ !mContent->GetFlattenedTreeParentNode() && this != mDoc) {
+ // This is inside a shadow host but is no longer slotted.
+ mDoc->ContentRemoved(this);
+ }
+}
+
+void LocalAccessible::ARIAGroupPosition(int32_t* aLevel, int32_t* aSetSize,
+ int32_t* aPosInSet) const {
+ if (!mContent) {
+ return;
+ }
+
+ if (aLevel) {
+ nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_level, aLevel);
+ }
+ if (aSetSize) {
+ nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_setsize, aSetSize);
+ }
+ if (aPosInSet) {
+ nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_posinset, aPosInSet);
+ }
+}
+
+uint64_t LocalAccessible::State() {
+ if (IsDefunct()) return states::DEFUNCT;
+
+ uint64_t state = NativeState();
+ // Apply ARIA states to be sure accessible states will be overridden.
+ ApplyARIAState(&state);
+
+ const uint32_t kExpandCollapseStates = states::COLLAPSED | states::EXPANDED;
+ if ((state & kExpandCollapseStates) == kExpandCollapseStates) {
+ // Cannot be both expanded and collapsed -- this happens in ARIA expanded
+ // combobox because of limitation of ARIAMap.
+ // XXX: Perhaps we will be able to make this less hacky if we support
+ // extended states in ARIAMap, e.g. derive COLLAPSED from
+ // EXPANDABLE && !EXPANDED.
+ state &= ~states::COLLAPSED;
+ }
+
+ if (!(state & states::UNAVAILABLE)) {
+ state |= states::ENABLED | states::SENSITIVE;
+
+ // If the object is a current item of container widget then mark it as
+ // ACTIVE. This allows screen reader virtual buffer modes to know which
+ // descendant is the current one that would get focus if the user navigates
+ // to the container widget.
+ LocalAccessible* widget = ContainerWidget();
+ if (widget && widget->CurrentItem() == this) state |= states::ACTIVE;
+ }
+
+ if ((state & states::COLLAPSED) || (state & states::EXPANDED)) {
+ state |= states::EXPANDABLE;
+ }
+
+ ApplyImplicitState(state);
+ return state;
+}
+
+void LocalAccessible::ApplyARIAState(uint64_t* aState) const {
+ if (!mContent->IsElement()) return;
+
+ dom::Element* element = mContent->AsElement();
+
+ // Test for universal states first
+ *aState |= aria::UniversalStatesFor(element);
+
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (roleMapEntry) {
+ // We only force the readonly bit off if we have a real mapping for the aria
+ // role. This preserves the ability for screen readers to use readonly
+ // (primarily on the document) as the hint for creating a virtual buffer.
+ if (roleMapEntry->role != roles::NOTHING) *aState &= ~states::READONLY;
+
+ if (mContent->HasID()) {
+ // If has a role & ID and aria-activedescendant on the container, assume
+ // focusable.
+ const LocalAccessible* ancestor = this;
+ while ((ancestor = ancestor->LocalParent()) && !ancestor->IsDoc()) {
+ dom::Element* el = ancestor->Elm();
+ if (el && el->HasAttr(nsGkAtoms::aria_activedescendant)) {
+ *aState |= states::FOCUSABLE;
+ break;
+ }
+ }
+ }
+ }
+
+ if (*aState & states::FOCUSABLE) {
+ // Propogate aria-disabled from ancestors down to any focusable descendant.
+ const LocalAccessible* ancestor = this;
+ while ((ancestor = ancestor->LocalParent()) && !ancestor->IsDoc()) {
+ dom::Element* el = ancestor->Elm();
+ if (el && nsAccUtils::ARIAAttrValueIs(el, nsGkAtoms::aria_disabled,
+ nsGkAtoms::_true, eCaseMatters)) {
+ *aState |= states::UNAVAILABLE;
+ break;
+ }
+ }
+ } else {
+ // Sometimes, we use aria-activedescendant targeting something which isn't
+ // actually a descendant. This is technically a spec violation, but it's a
+ // useful hack which makes certain things much easier. For example, we use
+ // this for "fake focus" for multi select browser tabs and Quantumbar
+ // autocomplete suggestions.
+ // In these cases, the aria-activedescendant code above won't make the
+ // active item focusable. It doesn't make sense for something to have
+ // focus when it isn't focusable, so fix that here.
+ if (FocusMgr()->IsActiveItem(this)) {
+ *aState |= states::FOCUSABLE;
+ }
+ }
+
+ // special case: A native button element whose role got transformed by ARIA to
+ // a toggle button Also applies to togglable button menus, like in the Dev
+ // Tools Web Console.
+ if (IsButton() || IsMenuButton()) {
+ aria::MapToState(aria::eARIAPressed, element, aState);
+ }
+
+ if (!roleMapEntry) return;
+
+ *aState |= roleMapEntry->state;
+
+ if (aria::MapToState(roleMapEntry->attributeMap1, element, aState) &&
+ aria::MapToState(roleMapEntry->attributeMap2, element, aState) &&
+ aria::MapToState(roleMapEntry->attributeMap3, element, aState)) {
+ aria::MapToState(roleMapEntry->attributeMap4, element, aState);
+ }
+
+ // ARIA gridcell inherits readonly state from the grid until it's overridden.
+ if ((roleMapEntry->Is(nsGkAtoms::gridcell) ||
+ roleMapEntry->Is(nsGkAtoms::columnheader) ||
+ roleMapEntry->Is(nsGkAtoms::rowheader)) &&
+ // Don't recurse infinitely for an authoring error like
+ // <table role="gridcell">. Without this check, we'd call TableFor(this)
+ // below, which would return this.
+ !IsTable() &&
+ !nsAccUtils::HasDefinedARIAToken(mContent, nsGkAtoms::aria_readonly)) {
+ if (const LocalAccessible* grid = nsAccUtils::TableFor(this)) {
+ uint64_t gridState = 0;
+ grid->ApplyARIAState(&gridState);
+ *aState |= gridState & states::READONLY;
+ }
+ }
+}
+
+void LocalAccessible::Value(nsString& aValue) const {
+ if (HasNumericValue()) {
+ // aria-valuenow is a number, and aria-valuetext is the optional text
+ // equivalent. For the string value, we will try the optional text
+ // equivalent first.
+ if (!mContent->IsElement()) {
+ return;
+ }
+
+ if (!nsAccUtils::GetARIAAttr(mContent->AsElement(),
+ nsGkAtoms::aria_valuetext, aValue)) {
+ if (!NativeHasNumericValue()) {
+ double checkValue = CurValue();
+ if (!std::isnan(checkValue)) {
+ aValue.AppendFloat(checkValue);
+ }
+ }
+ }
+ return;
+ }
+
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (!roleMapEntry) {
+ return;
+ }
+
+ // Value of textbox is a textified subtree.
+ if (roleMapEntry->Is(nsGkAtoms::textbox)) {
+ nsTextEquivUtils::GetTextEquivFromSubtree(this, aValue);
+ return;
+ }
+
+ // Value of combobox is a text of current or selected item.
+ if (roleMapEntry->Is(nsGkAtoms::combobox)) {
+ LocalAccessible* option = CurrentItem();
+ if (!option) {
+ uint32_t childCount = ChildCount();
+ for (uint32_t idx = 0; idx < childCount; idx++) {
+ LocalAccessible* child = mChildren.ElementAt(idx);
+ if (child->IsListControl()) {
+ Accessible* acc = child->GetSelectedItem(0);
+ option = acc ? acc->AsLocal() : nullptr;
+ break;
+ }
+ }
+ }
+
+ // If there's a selected item, get the value from it. Otherwise, determine
+ // the value from descendant elements.
+ nsTextEquivUtils::GetTextEquivFromSubtree(option ? option : this, aValue);
+ }
+}
+
+double LocalAccessible::MaxValue() const {
+ double checkValue = AttrNumericValue(nsGkAtoms::aria_valuemax);
+ if (std::isnan(checkValue) && !NativeHasNumericValue()) {
+ // aria-valuemax isn't present and this element doesn't natively provide a
+ // maximum value. Use the ARIA default.
+ const nsRoleMapEntry* roleMap = ARIARoleMap();
+ if (roleMap && roleMap->role == roles::SPINBUTTON) {
+ return UnspecifiedNaN<double>();
+ }
+ return 100;
+ }
+ return checkValue;
+}
+
+double LocalAccessible::MinValue() const {
+ double checkValue = AttrNumericValue(nsGkAtoms::aria_valuemin);
+ if (std::isnan(checkValue) && !NativeHasNumericValue()) {
+ // aria-valuemin isn't present and this element doesn't natively provide a
+ // minimum value. Use the ARIA default.
+ const nsRoleMapEntry* roleMap = ARIARoleMap();
+ if (roleMap && roleMap->role == roles::SPINBUTTON) {
+ return UnspecifiedNaN<double>();
+ }
+ return 0;
+ }
+ return checkValue;
+}
+
+double LocalAccessible::Step() const {
+ return UnspecifiedNaN<double>(); // no mimimum increment (step) in ARIA.
+}
+
+double LocalAccessible::CurValue() const {
+ double checkValue = AttrNumericValue(nsGkAtoms::aria_valuenow);
+ if (std::isnan(checkValue) && !NativeHasNumericValue()) {
+ // aria-valuenow isn't present and this element doesn't natively provide a
+ // current value. Use the ARIA default.
+ const nsRoleMapEntry* roleMap = ARIARoleMap();
+ if (roleMap && roleMap->role == roles::SPINBUTTON) {
+ return UnspecifiedNaN<double>();
+ }
+ double minValue = MinValue();
+ return minValue + ((MaxValue() - minValue) / 2);
+ }
+
+ return checkValue;
+}
+
+bool LocalAccessible::SetCurValue(double aValue) {
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (!roleMapEntry || roleMapEntry->valueRule == eNoValue) return false;
+
+ const uint32_t kValueCannotChange = states::READONLY | states::UNAVAILABLE;
+ if (State() & kValueCannotChange) return false;
+
+ double checkValue = MinValue();
+ if (!std::isnan(checkValue) && aValue < checkValue) return false;
+
+ checkValue = MaxValue();
+ if (!std::isnan(checkValue) && aValue > checkValue) return false;
+
+ nsAutoString strValue;
+ strValue.AppendFloat(aValue);
+
+ if (!mContent->IsElement()) return true;
+
+ return NS_SUCCEEDED(mContent->AsElement()->SetAttr(
+ kNameSpaceID_None, nsGkAtoms::aria_valuenow, strValue, true));
+}
+
+role LocalAccessible::ARIATransformRole(role aRole) const {
+ // Beginning with ARIA 1.1, user agents are expected to use the native host
+ // language role of the element when the region role is used without a name.
+ // https://rawgit.com/w3c/aria/master/core-aam/core-aam.html#role-map-region
+ //
+ // XXX: While the name computation algorithm can be non-trivial in the general
+ // case, it should not be especially bad here: If the author hasn't used the
+ // region role, this calculation won't occur. And the region role's name
+ // calculation rule excludes name from content. That said, this use case is
+ // another example of why we should consider caching the accessible name. See:
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=1378235.
+ if (aRole == roles::REGION) {
+ nsAutoString name;
+ Name(name);
+ return name.IsEmpty() ? NativeRole() : aRole;
+ }
+
+ // XXX: these unfortunate exceptions don't fit into the ARIA table. This is
+ // where the accessible role depends on both the role and ARIA state.
+ if (aRole == roles::PUSHBUTTON) {
+ if (nsAccUtils::HasDefinedARIAToken(mContent, nsGkAtoms::aria_pressed)) {
+ // For simplicity, any existing pressed attribute except "" or "undefined"
+ // indicates a toggle.
+ return roles::TOGGLE_BUTTON;
+ }
+
+ if (mContent->IsElement() &&
+ nsAccUtils::ARIAAttrValueIs(mContent->AsElement(),
+ nsGkAtoms::aria_haspopup, nsGkAtoms::_true,
+ eCaseMatters)) {
+ // For button with aria-haspopup="true".
+ return roles::BUTTONMENU;
+ }
+
+ } else if (aRole == roles::LISTBOX) {
+ // A listbox inside of a combobox needs a special role because of ATK
+ // mapping to menu.
+ if (mParent && mParent->IsCombobox()) {
+ return roles::COMBOBOX_LIST;
+ }
+
+ } else if (aRole == roles::OPTION) {
+ if (mParent && mParent->Role() == roles::COMBOBOX_LIST) {
+ return roles::COMBOBOX_OPTION;
+ }
+
+ } else if (aRole == roles::MENUITEM) {
+ // Menuitem has a submenu.
+ if (mContent->IsElement() &&
+ nsAccUtils::ARIAAttrValueIs(mContent->AsElement(),
+ nsGkAtoms::aria_haspopup, nsGkAtoms::_true,
+ eCaseMatters)) {
+ return roles::PARENT_MENUITEM;
+ }
+
+ } else if (aRole == roles::CELL) {
+ // A cell inside an ancestor table element that has a grid role needs a
+ // gridcell role
+ // (https://www.w3.org/TR/html-aam-1.0/#html-element-role-mappings).
+ const LocalAccessible* table = nsAccUtils::TableFor(this);
+ if (table && table->IsARIARole(nsGkAtoms::grid)) {
+ return roles::GRID_CELL;
+ }
+ }
+
+ return aRole;
+}
+
+role LocalAccessible::NativeRole() const { return roles::NOTHING; }
+
+uint8_t LocalAccessible::ActionCount() const {
+ return HasPrimaryAction() || ActionAncestor() ? 1 : 0;
+}
+
+void LocalAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+ aName.Truncate();
+
+ if (aIndex != 0) return;
+
+ uint32_t actionRule = GetActionRule();
+
+ switch (actionRule) {
+ case eActivateAction:
+ aName.AssignLiteral("activate");
+ return;
+
+ case eClickAction:
+ aName.AssignLiteral("click");
+ return;
+
+ case ePressAction:
+ aName.AssignLiteral("press");
+ return;
+
+ case eCheckUncheckAction: {
+ uint64_t state = State();
+ if (state & states::CHECKED) {
+ aName.AssignLiteral("uncheck");
+ } else if (state & states::MIXED) {
+ aName.AssignLiteral("cycle");
+ } else {
+ aName.AssignLiteral("check");
+ }
+ return;
+ }
+
+ case eJumpAction:
+ aName.AssignLiteral("jump");
+ return;
+
+ case eOpenCloseAction:
+ if (State() & states::COLLAPSED) {
+ aName.AssignLiteral("open");
+ } else {
+ aName.AssignLiteral("close");
+ }
+ return;
+
+ case eSelectAction:
+ aName.AssignLiteral("select");
+ return;
+
+ case eSwitchAction:
+ aName.AssignLiteral("switch");
+ return;
+
+ case eSortAction:
+ aName.AssignLiteral("sort");
+ return;
+
+ case eExpandAction:
+ if (State() & states::COLLAPSED) {
+ aName.AssignLiteral("expand");
+ } else {
+ aName.AssignLiteral("collapse");
+ }
+ return;
+ }
+
+ if (ActionAncestor()) {
+ aName.AssignLiteral("click ancestor");
+ return;
+ }
+}
+
+bool LocalAccessible::DoAction(uint8_t aIndex) const {
+ if (aIndex != 0) return false;
+
+ if (HasPrimaryAction() || ActionAncestor()) {
+ DoCommand();
+ return true;
+ }
+
+ return false;
+}
+
+bool LocalAccessible::HasPrimaryAction() const {
+ return GetActionRule() != eNoAction;
+}
+
+nsIContent* LocalAccessible::GetAtomicRegion() const {
+ nsIContent* loopContent = mContent;
+ nsAutoString atomic;
+ while (loopContent &&
+ (!loopContent->IsElement() ||
+ !nsAccUtils::GetARIAAttr(loopContent->AsElement(),
+ nsGkAtoms::aria_atomic, atomic))) {
+ loopContent = loopContent->GetParent();
+ }
+
+ return atomic.EqualsLiteral("true") ? loopContent : nullptr;
+}
+
+Relation LocalAccessible::RelationByType(RelationType aType) const {
+ if (!HasOwnContent()) return Relation();
+
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+
+ // Relationships are defined on the same content node that the role would be
+ // defined on.
+ switch (aType) {
+ case RelationType::LABELLED_BY: {
+ Relation rel(
+ new IDRefsIterator(mDoc, mContent, nsGkAtoms::aria_labelledby));
+ if (mContent->IsHTMLElement()) {
+ rel.AppendIter(new HTMLLabelIterator(Document(), this));
+ }
+ rel.AppendIter(new XULLabelIterator(Document(), mContent));
+
+ return rel;
+ }
+
+ case RelationType::LABEL_FOR: {
+ Relation rel(new RelatedAccIterator(Document(), mContent,
+ nsGkAtoms::aria_labelledby));
+ if (mContent->IsXULElement(nsGkAtoms::label)) {
+ rel.AppendIter(new IDRefsIterator(mDoc, mContent, nsGkAtoms::control));
+ }
+
+ return rel;
+ }
+
+ case RelationType::DESCRIBED_BY: {
+ Relation rel(
+ new IDRefsIterator(mDoc, mContent, nsGkAtoms::aria_describedby));
+ if (mContent->IsXULElement()) {
+ rel.AppendIter(new XULDescriptionIterator(Document(), mContent));
+ }
+
+ return rel;
+ }
+
+ case RelationType::DESCRIPTION_FOR: {
+ Relation rel(new RelatedAccIterator(Document(), mContent,
+ nsGkAtoms::aria_describedby));
+
+ // This affectively adds an optional control attribute to xul:description,
+ // which only affects accessibility, by allowing the description to be
+ // tied to a control.
+ if (mContent->IsXULElement(nsGkAtoms::description)) {
+ rel.AppendIter(new IDRefsIterator(mDoc, mContent, nsGkAtoms::control));
+ }
+
+ return rel;
+ }
+
+ case RelationType::NODE_CHILD_OF: {
+ Relation rel;
+ // This is an ARIA tree or treegrid that doesn't use owns, so we need to
+ // get the parent the hard way.
+ if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM ||
+ roleMapEntry->role == roles::LISTITEM ||
+ roleMapEntry->role == roles::ROW)) {
+ Accessible* parent = const_cast<LocalAccessible*>(this)
+ ->GetOrCreateGroupInfo()
+ ->ConceptualParent();
+ if (parent) {
+ MOZ_ASSERT(parent->IsLocal());
+ rel.AppendTarget(parent->AsLocal());
+ }
+ }
+
+ // If this is an OOP iframe document, we can't support NODE_CHILD_OF
+ // here, since the iframe resides in a different process. This is fine
+ // because the client will then request the parent instead, which will be
+ // correctly handled by platform code.
+ if (XRE_IsContentProcess() && IsRoot()) {
+ dom::Document* doc =
+ const_cast<LocalAccessible*>(this)->AsDoc()->DocumentNode();
+ dom::BrowsingContext* bc = doc->GetBrowsingContext();
+ MOZ_ASSERT(bc);
+ if (!bc->Top()->IsInProcess()) {
+ return rel;
+ }
+ }
+
+ // If accessible is in its own Window, or is the root of a document,
+ // then we should provide NODE_CHILD_OF relation so that MSAA clients
+ // can easily get to true parent instead of getting to oleacc's
+ // ROLE_WINDOW accessible which will prevent us from going up further
+ // (because it is system generated and has no idea about the hierarchy
+ // above it).
+ nsIFrame* frame = GetFrame();
+ if (frame) {
+ nsView* view = frame->GetView();
+ if (view) {
+ nsIScrollableFrame* scrollFrame = do_QueryFrame(frame);
+ if (scrollFrame || view->GetWidget() || !frame->GetParent()) {
+ rel.AppendTarget(LocalParent());
+ }
+ }
+ }
+
+ return rel;
+ }
+
+ case RelationType::NODE_PARENT_OF: {
+ // ARIA tree or treegrid can do the hierarchy by @aria-level, ARIA trees
+ // also can be organized by groups.
+ if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM ||
+ roleMapEntry->role == roles::LISTITEM ||
+ roleMapEntry->role == roles::ROW ||
+ roleMapEntry->role == roles::OUTLINE ||
+ roleMapEntry->role == roles::LIST ||
+ roleMapEntry->role == roles::TREE_TABLE)) {
+ return Relation(new ItemIterator(this));
+ }
+
+ return Relation();
+ }
+
+ case RelationType::CONTROLLED_BY:
+ return Relation(new RelatedAccIterator(Document(), mContent,
+ nsGkAtoms::aria_controls));
+
+ case RelationType::CONTROLLER_FOR: {
+ Relation rel(
+ new IDRefsIterator(mDoc, mContent, nsGkAtoms::aria_controls));
+ rel.AppendIter(new HTMLOutputIterator(Document(), mContent));
+ return rel;
+ }
+
+ case RelationType::FLOWS_TO:
+ return Relation(
+ new IDRefsIterator(mDoc, mContent, nsGkAtoms::aria_flowto));
+
+ case RelationType::FLOWS_FROM:
+ return Relation(
+ new RelatedAccIterator(Document(), mContent, nsGkAtoms::aria_flowto));
+
+ case RelationType::MEMBER_OF: {
+ if (Role() == roles::RADIOBUTTON) {
+ /* If we see a radio button role here, we're dealing with an aria
+ * radio button (because input=radio buttons are
+ * HTMLRadioButtonAccessibles) */
+ Relation rel = Relation();
+ LocalAccessible* currParent = LocalParent();
+ while (currParent && currParent->Role() != roles::RADIO_GROUP) {
+ currParent = currParent->LocalParent();
+ }
+
+ if (currParent && currParent->Role() == roles::RADIO_GROUP) {
+ /* If we found a radiogroup parent, search for all
+ * roles::RADIOBUTTON children and add them to our relation.
+ * This search will include the radio button this method
+ * was called from, which is expected. */
+ Pivot p = Pivot(currParent);
+ PivotRoleRule rule(roles::RADIOBUTTON);
+ Accessible* match = p.Next(currParent, rule);
+ while (match) {
+ MOZ_ASSERT(match->IsLocal(),
+ "We shouldn't find any remote accs while building our "
+ "relation!");
+ rel.AppendTarget(match->AsLocal());
+ match = p.Next(match, rule);
+ }
+ }
+
+ /* By webkit's standard, aria radio buttons do not get grouped
+ * if they lack a group parent, so we return an empty
+ * relation here if the above check fails. */
+
+ return rel;
+ }
+
+ return Relation(mDoc, GetAtomicRegion());
+ }
+
+ case RelationType::LINKS_TO: {
+ Relation rel = Relation();
+ if (Role() == roles::LINK) {
+ dom::HTMLAnchorElement* anchor =
+ dom::HTMLAnchorElement::FromNode(mContent);
+ if (!anchor) {
+ return rel;
+ }
+ // If this node is an anchor element, query its hash to find the
+ // target.
+ nsAutoString hash;
+ anchor->GetHash(hash);
+ if (hash.IsEmpty()) {
+ return rel;
+ }
+
+ // GetHash returns an ID or name with a leading '#', trim it so we can
+ // search the doc by ID or name alone.
+ hash.Trim("#");
+ if (dom::Element* elm = mContent->OwnerDoc()->GetElementById(hash)) {
+ rel.AppendTarget(mDoc->GetAccessibleOrContainer(elm));
+ } else if (nsCOMPtr<nsINodeList> list =
+ mContent->OwnerDoc()->GetElementsByName(hash)) {
+ // Loop through the named nodes looking for the first anchor
+ uint32_t length = list->Length();
+ for (uint32_t i = 0; i < length; i++) {
+ nsIContent* node = list->Item(i);
+ if (node->IsHTMLElement(nsGkAtoms::a)) {
+ rel.AppendTarget(mDoc->GetAccessibleOrContainer(node));
+ break;
+ }
+ }
+ }
+ }
+
+ return rel;
+ }
+
+ case RelationType::SUBWINDOW_OF:
+ case RelationType::EMBEDS:
+ case RelationType::EMBEDDED_BY:
+ case RelationType::POPUP_FOR:
+ case RelationType::PARENT_WINDOW_OF:
+ return Relation();
+
+ case RelationType::DEFAULT_BUTTON: {
+ if (mContent->IsHTMLElement()) {
+ // HTML form controls implements nsIFormControl interface.
+ nsCOMPtr<nsIFormControl> control(do_QueryInterface(mContent));
+ if (control) {
+ if (dom::HTMLFormElement* form = control->GetForm()) {
+ return Relation(mDoc, form->GetDefaultSubmitElement());
+ }
+ }
+ } else {
+ // In XUL, use first <button default="true" .../> in the document
+ dom::Document* doc = mContent->OwnerDoc();
+ nsIContent* buttonEl = nullptr;
+ if (doc->AllowXULXBL()) {
+ nsCOMPtr<nsIHTMLCollection> possibleDefaultButtons =
+ doc->GetElementsByAttribute(u"default"_ns, u"true"_ns);
+ if (possibleDefaultButtons) {
+ uint32_t length = possibleDefaultButtons->Length();
+ // Check for button in list of default="true" elements
+ for (uint32_t count = 0; count < length && !buttonEl; count++) {
+ nsIContent* item = possibleDefaultButtons->Item(count);
+ RefPtr<nsIDOMXULButtonElement> button =
+ item->IsElement() ? item->AsElement()->AsXULButton()
+ : nullptr;
+ if (button) {
+ buttonEl = item;
+ }
+ }
+ }
+ return Relation(mDoc, buttonEl);
+ }
+ }
+ return Relation();
+ }
+
+ case RelationType::CONTAINING_DOCUMENT:
+ return Relation(mDoc);
+
+ case RelationType::CONTAINING_TAB_PANE: {
+ nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(GetNode());
+ if (docShell) {
+ // Walk up the parent chain without crossing the boundary at which item
+ // types change, preventing us from walking up out of tab content.
+ nsCOMPtr<nsIDocShellTreeItem> root;
+ docShell->GetInProcessSameTypeRootTreeItem(getter_AddRefs(root));
+ if (root) {
+ // If the item type is typeContent, we assume we are in browser tab
+ // content. Note, this includes content such as about:addons,
+ // for consistency.
+ if (root->ItemType() == nsIDocShellTreeItem::typeContent) {
+ return Relation(nsAccUtils::GetDocAccessibleFor(root));
+ }
+ }
+ }
+ return Relation();
+ }
+
+ case RelationType::CONTAINING_APPLICATION:
+ return Relation(ApplicationAcc());
+
+ case RelationType::DETAILS:
+ return Relation(
+ new IDRefsIterator(mDoc, mContent, nsGkAtoms::aria_details));
+
+ case RelationType::DETAILS_FOR:
+ return Relation(
+ new RelatedAccIterator(mDoc, mContent, nsGkAtoms::aria_details));
+
+ case RelationType::ERRORMSG:
+ return Relation(
+ new IDRefsIterator(mDoc, mContent, nsGkAtoms::aria_errormessage));
+
+ case RelationType::ERRORMSG_FOR:
+ return Relation(
+ new RelatedAccIterator(mDoc, mContent, nsGkAtoms::aria_errormessage));
+
+ default:
+ return Relation();
+ }
+}
+
+void LocalAccessible::GetNativeInterface(void** aNativeAccessible) {}
+
+void LocalAccessible::DoCommand(nsIContent* aContent,
+ uint32_t aActionIndex) const {
+ class Runnable final : public mozilla::Runnable {
+ public:
+ Runnable(const LocalAccessible* aAcc, nsIContent* aContent, uint32_t aIdx)
+ : mozilla::Runnable("Runnable"),
+ mAcc(aAcc),
+ mContent(aContent),
+ mIdx(aIdx) {}
+
+ // XXX Cannot mark as MOZ_CAN_RUN_SCRIPT because the base class change
+ // requires too big changes across a lot of modules.
+ MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override {
+ if (mAcc) {
+ MOZ_KnownLive(mAcc)->DispatchClickEvent(MOZ_KnownLive(mContent), mIdx);
+ }
+ return NS_OK;
+ }
+
+ void Revoke() {
+ mAcc = nullptr;
+ mContent = nullptr;
+ }
+
+ private:
+ RefPtr<const LocalAccessible> mAcc;
+ nsCOMPtr<nsIContent> mContent;
+ uint32_t mIdx;
+ };
+
+ nsIContent* content = aContent ? aContent : mContent.get();
+ nsCOMPtr<nsIRunnable> runnable = new Runnable(this, content, aActionIndex);
+ NS_DispatchToMainThread(runnable);
+}
+
+void LocalAccessible::DispatchClickEvent(nsIContent* aContent,
+ uint32_t aActionIndex) const {
+ if (IsDefunct()) return;
+
+ RefPtr<PresShell> presShell = mDoc->PresShellPtr();
+
+ // Scroll into view.
+ presShell->ScrollContentIntoView(aContent, ScrollAxis(), ScrollAxis(),
+ ScrollFlags::ScrollOverflowHidden);
+
+ AutoWeakFrame frame = aContent->GetPrimaryFrame();
+ if (!frame) return;
+
+ // Compute x and y coordinates.
+ nsPoint point;
+ nsCOMPtr<nsIWidget> widget = frame->GetNearestWidget(point);
+ if (!widget) return;
+
+ nsSize size = frame->GetSize();
+
+ RefPtr<nsPresContext> presContext = presShell->GetPresContext();
+ int32_t x = presContext->AppUnitsToDevPixels(point.x + size.width / 2);
+ int32_t y = presContext->AppUnitsToDevPixels(point.y + size.height / 2);
+
+ // Simulate a touch interaction by dispatching touch events with mouse events.
+ nsCoreUtils::DispatchTouchEvent(eTouchStart, x, y, aContent, frame, presShell,
+ widget);
+ nsCoreUtils::DispatchMouseEvent(eMouseDown, x, y, aContent, frame, presShell,
+ widget);
+ nsCoreUtils::DispatchTouchEvent(eTouchEnd, x, y, aContent, frame, presShell,
+ widget);
+ nsCoreUtils::DispatchMouseEvent(eMouseUp, x, y, aContent, frame, presShell,
+ widget);
+}
+
+void LocalAccessible::ScrollToPoint(uint32_t aCoordinateType, int32_t aX,
+ int32_t aY) {
+ nsIFrame* frame = GetFrame();
+ if (!frame) return;
+
+ LayoutDeviceIntPoint coords =
+ nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordinateType, this);
+
+ nsIFrame* parentFrame = frame;
+ while ((parentFrame = parentFrame->GetParent())) {
+ nsCoreUtils::ScrollFrameToPoint(parentFrame, frame, coords);
+ }
+}
+
+void LocalAccessible::AppendTextTo(nsAString& aText, uint32_t aStartOffset,
+ uint32_t aLength) {
+ // Return text representation of non-text accessible within hypertext
+ // accessible. Text accessible overrides this method to return enclosed text.
+ if (aStartOffset != 0 || aLength == 0) return;
+
+ MOZ_ASSERT(mParent,
+ "Called on accessible unbound from tree. Result can be wrong.");
+ nsIFrame* frame = GetFrame();
+ // We handle something becoming display: none async, which means we won't have
+ // a frame when we're queuing text removed events. Thus, it's important that
+ // we produce text here even if there's no frame. Otherwise, we won't fire a
+ // text removed event at all, which might leave client caches (e.g. NVDA
+ // virtual buffers) with dead nodes.
+ if (IsHTMLBr() || (frame && frame->IsBrFrame())) {
+ aText += kForcedNewLineChar;
+ } else if (mParent && nsAccUtils::MustPrune(mParent)) {
+ // Expose the embedded object accessible as imaginary embedded object
+ // character if its parent hypertext accessible doesn't expose children to
+ // AT.
+ aText += kImaginaryEmbeddedObjectChar;
+ } else {
+ aText += kEmbeddedObjectChar;
+ }
+}
+
+void LocalAccessible::Shutdown() {
+ // Mark the accessible as defunct, invalidate the child count and pointers to
+ // other accessibles, also make sure none of its children point to this
+ // parent
+ mStateFlags |= eIsDefunct;
+
+ int32_t childCount = mChildren.Length();
+ for (int32_t childIdx = 0; childIdx < childCount; childIdx++) {
+ mChildren.ElementAt(childIdx)->UnbindFromParent();
+ }
+ mChildren.Clear();
+
+ mEmbeddedObjCollector = nullptr;
+
+ if (mParent) mParent->RemoveChild(this);
+
+ mContent = nullptr;
+ mDoc = nullptr;
+ if (SelectionMgr() && SelectionMgr()->AccessibleWithCaret(nullptr) == this) {
+ SelectionMgr()->ResetCaretOffset();
+ }
+}
+
+// LocalAccessible protected
+void LocalAccessible::ARIAName(nsString& aName) const {
+ // aria-labelledby now takes precedence over aria-label
+ nsresult rv = nsTextEquivUtils::GetTextEquivFromIDRefs(
+ this, nsGkAtoms::aria_labelledby, aName);
+ if (NS_SUCCEEDED(rv)) {
+ aName.CompressWhitespace();
+ }
+
+ if (aName.IsEmpty() && mContent->IsElement() &&
+ nsAccUtils::GetARIAAttr(mContent->AsElement(), nsGkAtoms::aria_label,
+ aName)) {
+ aName.CompressWhitespace();
+ }
+}
+
+// LocalAccessible protected
+void LocalAccessible::ARIADescription(nsString& aDescription) const {
+ // aria-describedby takes precedence over aria-description
+ nsresult rv = nsTextEquivUtils::GetTextEquivFromIDRefs(
+ this, nsGkAtoms::aria_describedby, aDescription);
+ if (NS_SUCCEEDED(rv)) {
+ aDescription.CompressWhitespace();
+ }
+
+ if (aDescription.IsEmpty() && mContent->IsElement() &&
+ nsAccUtils::GetARIAAttr(mContent->AsElement(),
+ nsGkAtoms::aria_description, aDescription)) {
+ aDescription.CompressWhitespace();
+ }
+}
+
+// LocalAccessible protected
+ENameValueFlag LocalAccessible::NativeName(nsString& aName) const {
+ if (mContent->IsHTMLElement()) {
+ LocalAccessible* label = nullptr;
+ HTMLLabelIterator iter(Document(), this);
+ while ((label = iter.Next())) {
+ nsTextEquivUtils::AppendTextEquivFromContent(this, label->GetContent(),
+ &aName);
+ aName.CompressWhitespace();
+ }
+
+ if (!aName.IsEmpty()) return eNameOK;
+
+ NameFromAssociatedXULLabel(mDoc, mContent, aName);
+ if (!aName.IsEmpty()) {
+ return eNameOK;
+ }
+
+ nsTextEquivUtils::GetNameFromSubtree(this, aName);
+ return aName.IsEmpty() ? eNameOK : eNameFromSubtree;
+ }
+
+ if (mContent->IsXULElement()) {
+ XULElmName(mDoc, mContent, aName);
+ if (!aName.IsEmpty()) return eNameOK;
+
+ nsTextEquivUtils::GetNameFromSubtree(this, aName);
+ return aName.IsEmpty() ? eNameOK : eNameFromSubtree;
+ }
+
+ if (mContent->IsSVGElement()) {
+ // If user agents need to choose among multiple 'desc' or 'title'
+ // elements for processing, the user agent shall choose the first one.
+ for (nsIContent* childElm = mContent->GetFirstChild(); childElm;
+ childElm = childElm->GetNextSibling()) {
+ if (childElm->IsSVGElement(nsGkAtoms::title)) {
+ nsTextEquivUtils::AppendTextEquivFromContent(this, childElm, &aName);
+ return eNameOK;
+ }
+ }
+ }
+
+ return eNameOK;
+}
+
+// LocalAccessible protected
+void LocalAccessible::NativeDescription(nsString& aDescription) const {
+ bool isXUL = mContent->IsXULElement();
+ if (isXUL) {
+ // Try XUL <description control="[id]">description text</description>
+ XULDescriptionIterator iter(Document(), mContent);
+ LocalAccessible* descr = nullptr;
+ while ((descr = iter.Next())) {
+ nsTextEquivUtils::AppendTextEquivFromContent(this, descr->GetContent(),
+ &aDescription);
+ }
+ }
+}
+
+// LocalAccessible protected
+void LocalAccessible::BindToParent(LocalAccessible* aParent,
+ uint32_t aIndexInParent) {
+ MOZ_ASSERT(aParent, "This method isn't used to set null parent");
+ MOZ_ASSERT(!mParent, "The child was expected to be moved");
+
+#ifdef A11Y_LOG
+ if (mParent) {
+ logging::TreeInfo("BindToParent: stealing accessible", 0, "old parent",
+ mParent, "new parent", aParent, "child", this, nullptr);
+ }
+#endif
+
+ mParent = aParent;
+ mIndexInParent = aIndexInParent;
+
+ if (mParent->HasNameDependent() || mParent->IsXULListItem() ||
+ RelationByType(RelationType::LABEL_FOR).Next() ||
+ nsTextEquivUtils::HasNameRule(mParent, eNameFromSubtreeRule)) {
+ mContextFlags |= eHasNameDependent;
+ } else {
+ mContextFlags &= ~eHasNameDependent;
+ }
+ if (mParent->HasDescriptionDependent() ||
+ RelationByType(RelationType::DESCRIPTION_FOR).Next()) {
+ mContextFlags |= eHasDescriptionDependent;
+ } else {
+ mContextFlags &= ~eHasDescriptionDependent;
+ }
+
+ // Add name/description dependent flags for dependent content once
+ // a name/description provider is added to doc.
+ Relation rel = RelationByType(RelationType::LABELLED_BY);
+ LocalAccessible* relTarget = nullptr;
+ while ((relTarget = rel.LocalNext())) {
+ if (!relTarget->HasNameDependent()) {
+ relTarget->ModifySubtreeContextFlags(eHasNameDependent, true);
+ }
+ }
+
+ rel = RelationByType(RelationType::DESCRIBED_BY);
+ while ((relTarget = rel.LocalNext())) {
+ if (!relTarget->HasDescriptionDependent()) {
+ relTarget->ModifySubtreeContextFlags(eHasDescriptionDependent, true);
+ }
+ }
+
+ mContextFlags |=
+ static_cast<uint32_t>((mParent->IsAlert() || mParent->IsInsideAlert())) &
+ eInsideAlert;
+
+ if (IsTableCell()) {
+ CachedTableAccessible::Invalidate(this);
+ }
+}
+
+// LocalAccessible protected
+void LocalAccessible::UnbindFromParent() {
+ // We do this here to handle document shutdown and an Accessible being moved.
+ // We do this for subtree removal in DocAccessible::UncacheChildrenInSubtree.
+ if (IsTable() || IsTableCell()) {
+ CachedTableAccessible::Invalidate(this);
+ }
+
+ mParent = nullptr;
+ mIndexInParent = -1;
+ mIndexOfEmbeddedChild = -1;
+
+ delete mGroupInfo;
+ mGroupInfo = nullptr;
+ mContextFlags &= ~eHasNameDependent & ~eInsideAlert;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible public methods
+
+RootAccessible* LocalAccessible::RootAccessible() const {
+ nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(GetNode());
+ NS_ASSERTION(docShell, "No docshell for mContent");
+ if (!docShell) {
+ return nullptr;
+ }
+
+ nsCOMPtr<nsIDocShellTreeItem> root;
+ docShell->GetInProcessRootTreeItem(getter_AddRefs(root));
+ NS_ASSERTION(root, "No root content tree item");
+ if (!root) {
+ return nullptr;
+ }
+
+ DocAccessible* docAcc = nsAccUtils::GetDocAccessibleFor(root);
+ return docAcc ? docAcc->AsRoot() : nullptr;
+}
+
+nsIFrame* LocalAccessible::GetFrame() const {
+ return mContent ? mContent->GetPrimaryFrame() : nullptr;
+}
+
+nsINode* LocalAccessible::GetNode() const { return mContent; }
+
+dom::Element* LocalAccessible::Elm() const {
+ return dom::Element::FromNodeOrNull(mContent);
+}
+
+void LocalAccessible::Language(nsAString& aLanguage) {
+ aLanguage.Truncate();
+
+ if (!mDoc) return;
+
+ nsCoreUtils::GetLanguageFor(mContent, nullptr, aLanguage);
+ if (aLanguage.IsEmpty()) { // Nothing found, so use document's language
+ mDoc->DocumentNode()->GetHeaderData(nsGkAtoms::headerContentLanguage,
+ aLanguage);
+ }
+}
+
+bool LocalAccessible::InsertChildAt(uint32_t aIndex, LocalAccessible* aChild) {
+ if (!aChild) return false;
+
+ if (aIndex == mChildren.Length()) {
+ // XXX(Bug 1631371) Check if this should use a fallible operation as it
+ // pretended earlier.
+ mChildren.AppendElement(aChild);
+ } else {
+ // XXX(Bug 1631371) Check if this should use a fallible operation as it
+ // pretended earlier.
+ mChildren.InsertElementAt(aIndex, aChild);
+
+ MOZ_ASSERT(mStateFlags & eKidsMutating, "Illicit children change");
+
+ for (uint32_t idx = aIndex + 1; idx < mChildren.Length(); idx++) {
+ mChildren[idx]->mIndexInParent = idx;
+ }
+ }
+
+ if (aChild->IsText()) {
+ mStateFlags |= eHasTextKids;
+ }
+
+ aChild->BindToParent(this, aIndex);
+ return true;
+}
+
+bool LocalAccessible::RemoveChild(LocalAccessible* aChild) {
+ MOZ_DIAGNOSTIC_ASSERT(aChild, "No child was given");
+ MOZ_DIAGNOSTIC_ASSERT(aChild->mParent, "No parent");
+ MOZ_DIAGNOSTIC_ASSERT(aChild->mParent == this, "Wrong parent");
+ MOZ_DIAGNOSTIC_ASSERT(aChild->mIndexInParent != -1,
+ "Unbound child was given");
+ MOZ_DIAGNOSTIC_ASSERT((mStateFlags & eKidsMutating) || aChild->IsDefunct() ||
+ aChild->IsDoc() || IsApplication(),
+ "Illicit children change");
+
+ int32_t index = static_cast<uint32_t>(aChild->mIndexInParent);
+ if (mChildren.SafeElementAt(index) != aChild) {
+ MOZ_ASSERT_UNREACHABLE("A wrong child index");
+ index = mChildren.IndexOf(aChild);
+ if (index == -1) {
+ MOZ_ASSERT_UNREACHABLE("No child was found");
+ return false;
+ }
+ }
+
+ aChild->UnbindFromParent();
+ mChildren.RemoveElementAt(index);
+
+ for (uint32_t idx = index; idx < mChildren.Length(); idx++) {
+ mChildren[idx]->mIndexInParent = idx;
+ }
+
+ return true;
+}
+
+void LocalAccessible::RelocateChild(uint32_t aNewIndex,
+ LocalAccessible* aChild) {
+ MOZ_DIAGNOSTIC_ASSERT(aChild, "No child was given");
+ MOZ_DIAGNOSTIC_ASSERT(aChild->mParent == this,
+ "A child from different subtree was given");
+ MOZ_DIAGNOSTIC_ASSERT(aChild->mIndexInParent != -1,
+ "Unbound child was given");
+ MOZ_DIAGNOSTIC_ASSERT(
+ aChild->mParent->LocalChildAt(aChild->mIndexInParent) == aChild,
+ "Wrong index in parent");
+ MOZ_DIAGNOSTIC_ASSERT(
+ static_cast<uint32_t>(aChild->mIndexInParent) != aNewIndex,
+ "No move, same index");
+ MOZ_DIAGNOSTIC_ASSERT(aNewIndex <= mChildren.Length(),
+ "Wrong new index was given");
+
+ RefPtr<AccHideEvent> hideEvent = new AccHideEvent(aChild, false);
+ if (mDoc->Controller()->QueueMutationEvent(hideEvent)) {
+ aChild->SetHideEventTarget(true);
+ }
+
+ mEmbeddedObjCollector = nullptr;
+ mChildren.RemoveElementAt(aChild->mIndexInParent);
+
+ uint32_t startIdx = aNewIndex, endIdx = aChild->mIndexInParent;
+
+ // If the child is moved after its current position.
+ if (static_cast<uint32_t>(aChild->mIndexInParent) < aNewIndex) {
+ startIdx = aChild->mIndexInParent;
+ if (aNewIndex == mChildren.Length() + 1) {
+ // The child is moved to the end.
+ mChildren.AppendElement(aChild);
+ endIdx = mChildren.Length() - 1;
+ } else {
+ mChildren.InsertElementAt(aNewIndex - 1, aChild);
+ endIdx = aNewIndex;
+ }
+ } else {
+ // The child is moved prior its current position.
+ mChildren.InsertElementAt(aNewIndex, aChild);
+ }
+
+ for (uint32_t idx = startIdx; idx <= endIdx; idx++) {
+ mChildren[idx]->mIndexInParent = idx;
+ mChildren[idx]->mIndexOfEmbeddedChild = -1;
+ }
+
+ for (uint32_t idx = 0; idx < mChildren.Length(); idx++) {
+ mChildren[idx]->mStateFlags |= eGroupInfoDirty;
+ }
+
+ RefPtr<AccShowEvent> showEvent = new AccShowEvent(aChild);
+ DebugOnly<bool> added = mDoc->Controller()->QueueMutationEvent(showEvent);
+ MOZ_ASSERT(added);
+ aChild->SetShowEventTarget(true);
+}
+
+LocalAccessible* LocalAccessible::LocalChildAt(uint32_t aIndex) const {
+ LocalAccessible* child = mChildren.SafeElementAt(aIndex, nullptr);
+ if (!child) return nullptr;
+
+#ifdef DEBUG
+ LocalAccessible* realParent = child->mParent;
+ NS_ASSERTION(!realParent || realParent == this,
+ "Two accessibles have the same first child accessible!");
+#endif
+
+ return child;
+}
+
+uint32_t LocalAccessible::ChildCount() const { return mChildren.Length(); }
+
+int32_t LocalAccessible::IndexInParent() const { return mIndexInParent; }
+
+uint32_t LocalAccessible::EmbeddedChildCount() {
+ if (mStateFlags & eHasTextKids) {
+ if (!mEmbeddedObjCollector) {
+ mEmbeddedObjCollector.reset(new EmbeddedObjCollector(this));
+ }
+ return mEmbeddedObjCollector->Count();
+ }
+
+ return ChildCount();
+}
+
+Accessible* LocalAccessible::EmbeddedChildAt(uint32_t aIndex) {
+ if (mStateFlags & eHasTextKids) {
+ if (!mEmbeddedObjCollector) {
+ mEmbeddedObjCollector.reset(new EmbeddedObjCollector(this));
+ }
+ return mEmbeddedObjCollector.get()
+ ? mEmbeddedObjCollector->GetAccessibleAt(aIndex)
+ : nullptr;
+ }
+
+ return ChildAt(aIndex);
+}
+
+int32_t LocalAccessible::IndexOfEmbeddedChild(Accessible* aChild) {
+ MOZ_ASSERT(aChild->IsLocal());
+ if (mStateFlags & eHasTextKids) {
+ if (!mEmbeddedObjCollector) {
+ mEmbeddedObjCollector.reset(new EmbeddedObjCollector(this));
+ }
+ return mEmbeddedObjCollector.get()
+ ? mEmbeddedObjCollector->GetIndexAt(aChild->AsLocal())
+ : -1;
+ }
+
+ return GetIndexOf(aChild->AsLocal());
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// HyperLinkAccessible methods
+
+bool LocalAccessible::IsLink() const {
+ // Every embedded accessible within hypertext accessible implements
+ // hyperlink interface.
+ return mParent && mParent->IsHyperText() && !IsText();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// SelectAccessible
+
+void LocalAccessible::SelectedItems(nsTArray<Accessible*>* aItems) {
+ AccIterator iter(this, filters::GetSelected);
+ LocalAccessible* selected = nullptr;
+ while ((selected = iter.Next())) aItems->AppendElement(selected);
+}
+
+uint32_t LocalAccessible::SelectedItemCount() {
+ uint32_t count = 0;
+ AccIterator iter(this, filters::GetSelected);
+ LocalAccessible* selected = nullptr;
+ while ((selected = iter.Next())) ++count;
+
+ return count;
+}
+
+Accessible* LocalAccessible::GetSelectedItem(uint32_t aIndex) {
+ AccIterator iter(this, filters::GetSelected);
+ LocalAccessible* selected = nullptr;
+
+ uint32_t index = 0;
+ while ((selected = iter.Next()) && index < aIndex) index++;
+
+ return selected;
+}
+
+bool LocalAccessible::IsItemSelected(uint32_t aIndex) {
+ uint32_t index = 0;
+ AccIterator iter(this, filters::GetSelectable);
+ LocalAccessible* selected = nullptr;
+ while ((selected = iter.Next()) && index < aIndex) index++;
+
+ return selected && selected->State() & states::SELECTED;
+}
+
+bool LocalAccessible::AddItemToSelection(uint32_t aIndex) {
+ uint32_t index = 0;
+ AccIterator iter(this, filters::GetSelectable);
+ LocalAccessible* selected = nullptr;
+ while ((selected = iter.Next()) && index < aIndex) index++;
+
+ if (selected) selected->SetSelected(true);
+
+ return static_cast<bool>(selected);
+}
+
+bool LocalAccessible::RemoveItemFromSelection(uint32_t aIndex) {
+ uint32_t index = 0;
+ AccIterator iter(this, filters::GetSelectable);
+ LocalAccessible* selected = nullptr;
+ while ((selected = iter.Next()) && index < aIndex) index++;
+
+ if (selected) selected->SetSelected(false);
+
+ return static_cast<bool>(selected);
+}
+
+bool LocalAccessible::SelectAll() {
+ bool success = false;
+ LocalAccessible* selectable = nullptr;
+
+ AccIterator iter(this, filters::GetSelectable);
+ while ((selectable = iter.Next())) {
+ success = true;
+ selectable->SetSelected(true);
+ }
+ return success;
+}
+
+bool LocalAccessible::UnselectAll() {
+ bool success = false;
+ LocalAccessible* selected = nullptr;
+
+ AccIterator iter(this, filters::GetSelected);
+ while ((selected = iter.Next())) {
+ success = true;
+ selected->SetSelected(false);
+ }
+ return success;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Widgets
+
+bool LocalAccessible::IsWidget() const { return false; }
+
+bool LocalAccessible::IsActiveWidget() const {
+ if (FocusMgr()->HasDOMFocus(mContent)) return true;
+
+ // If text entry of combobox widget has a focus then the combobox widget is
+ // active.
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (roleMapEntry && roleMapEntry->Is(nsGkAtoms::combobox)) {
+ uint32_t childCount = ChildCount();
+ for (uint32_t idx = 0; idx < childCount; idx++) {
+ LocalAccessible* child = mChildren.ElementAt(idx);
+ if (child->Role() == roles::ENTRY) {
+ return FocusMgr()->HasDOMFocus(child->GetContent());
+ }
+ }
+ }
+
+ return false;
+}
+
+bool LocalAccessible::AreItemsOperable() const {
+ return HasOwnContent() && mContent->IsElement() &&
+ mContent->AsElement()->HasAttr(nsGkAtoms::aria_activedescendant);
+}
+
+LocalAccessible* LocalAccessible::CurrentItem() const {
+ // Check for aria-activedescendant, which changes which element has focus.
+ // For activedescendant, the ARIA spec does not require that the user agent
+ // checks whether pointed node is actually a DOM descendant of the element
+ // with the aria-activedescendant attribute.
+ nsAutoString id;
+ if (HasOwnContent() && mContent->IsElement() &&
+ mContent->AsElement()->GetAttr(nsGkAtoms::aria_activedescendant, id)) {
+ dom::Element* activeDescendantElm = IDRefsIterator::GetElem(mContent, id);
+ if (activeDescendantElm) {
+ if (mContent->IsInclusiveDescendantOf(activeDescendantElm)) {
+ // Don't want a cyclical descendant relationship. That would be bad.
+ return nullptr;
+ }
+
+ DocAccessible* document = Document();
+ if (document) return document->GetAccessible(activeDescendantElm);
+ }
+ }
+ return nullptr;
+}
+
+void LocalAccessible::SetCurrentItem(const LocalAccessible* aItem) {
+ nsAtom* id = aItem->GetContent()->GetID();
+ if (id) {
+ nsAutoString idStr;
+ id->ToString(idStr);
+ mContent->AsElement()->SetAttr(
+ kNameSpaceID_None, nsGkAtoms::aria_activedescendant, idStr, true);
+ }
+}
+
+LocalAccessible* LocalAccessible::ContainerWidget() const {
+ if (HasARIARole() && mContent->HasID()) {
+ for (LocalAccessible* parent = LocalParent(); parent;
+ parent = parent->LocalParent()) {
+ nsIContent* parentContent = parent->GetContent();
+ if (parentContent && parentContent->IsElement() &&
+ parentContent->AsElement()->HasAttr(
+ nsGkAtoms::aria_activedescendant)) {
+ return parent;
+ }
+
+ // Don't cross DOM document boundaries.
+ if (parent->IsDoc()) break;
+ }
+ }
+ return nullptr;
+}
+
+bool LocalAccessible::IsActiveDescendant(LocalAccessible** aWidget) const {
+ if (!HasOwnContent() || !mContent->HasID()) {
+ return false;
+ }
+
+ dom::DocumentOrShadowRoot* docOrShadowRoot =
+ mContent->GetUncomposedDocOrConnectedShadowRoot();
+ if (!docOrShadowRoot) {
+ return false;
+ }
+
+ nsAutoCString selector;
+ selector.AppendPrintf(
+ "[aria-activedescendant=\"%s\"]",
+ NS_ConvertUTF16toUTF8(mContent->GetID()->GetUTF16String()).get());
+ IgnoredErrorResult er;
+
+ dom::Element* widgetElm =
+ docOrShadowRoot->AsNode().QuerySelector(selector, er);
+
+ if (!widgetElm || er.Failed()) {
+ return false;
+ }
+
+ if (widgetElm->IsInclusiveDescendantOf(mContent)) {
+ // Don't want a cyclical descendant relationship. That would be bad.
+ return false;
+ }
+
+ LocalAccessible* widget = mDoc->GetAccessible(widgetElm);
+
+ if (aWidget) {
+ *aWidget = widget;
+ }
+
+ return !!widget;
+}
+
+void LocalAccessible::Announce(const nsAString& aAnnouncement,
+ uint16_t aPriority) {
+ RefPtr<AccAnnouncementEvent> event =
+ new AccAnnouncementEvent(this, aAnnouncement, aPriority);
+ nsEventShell::FireEvent(event);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible protected methods
+
+void LocalAccessible::LastRelease() {
+ // First cleanup if needed...
+ if (mDoc) {
+ Shutdown();
+ NS_ASSERTION(!mDoc,
+ "A Shutdown() impl forgot to call its parent's Shutdown?");
+ }
+ // ... then die.
+ delete this;
+}
+
+LocalAccessible* LocalAccessible::GetSiblingAtOffset(int32_t aOffset,
+ nsresult* aError) const {
+ if (!mParent || mIndexInParent == -1) {
+ if (aError) *aError = NS_ERROR_UNEXPECTED;
+
+ return nullptr;
+ }
+
+ if (aError &&
+ mIndexInParent + aOffset >= static_cast<int32_t>(mParent->ChildCount())) {
+ *aError = NS_OK; // fail peacefully
+ return nullptr;
+ }
+
+ LocalAccessible* child = mParent->LocalChildAt(mIndexInParent + aOffset);
+ if (aError && !child) *aError = NS_ERROR_UNEXPECTED;
+
+ return child;
+}
+
+void LocalAccessible::ModifySubtreeContextFlags(uint32_t aContextFlags,
+ bool aAdd) {
+ Pivot pivot(this);
+ LocalAccInSameDocRule rule;
+ for (Accessible* anchor = this; anchor; anchor = pivot.Next(anchor, rule)) {
+ MOZ_ASSERT(anchor->IsLocal());
+ LocalAccessible* acc = anchor->AsLocal();
+ if (aAdd) {
+ acc->mContextFlags |= aContextFlags;
+ } else {
+ acc->mContextFlags &= ~aContextFlags;
+ }
+ }
+}
+
+double LocalAccessible::AttrNumericValue(nsAtom* aAttr) const {
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (!roleMapEntry || roleMapEntry->valueRule == eNoValue) {
+ return UnspecifiedNaN<double>();
+ }
+
+ nsAutoString attrValue;
+ if (!mContent->IsElement() ||
+ !nsAccUtils::GetARIAAttr(mContent->AsElement(), aAttr, attrValue)) {
+ return UnspecifiedNaN<double>();
+ }
+
+ nsresult error = NS_OK;
+ double value = attrValue.ToDouble(&error);
+ return NS_FAILED(error) ? UnspecifiedNaN<double>() : value;
+}
+
+uint32_t LocalAccessible::GetActionRule() const {
+ if (!HasOwnContent() || (InteractiveState() & states::UNAVAILABLE)) {
+ return eNoAction;
+ }
+
+ // Return "click" action on elements that have an attached popup menu.
+ if (mContent->IsXULElement()) {
+ if (mContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::popup)) {
+ return eClickAction;
+ }
+ }
+
+ // Has registered 'click' event handler.
+ bool isOnclick = nsCoreUtils::HasClickListener(mContent);
+
+ if (isOnclick) return eClickAction;
+
+ // Get an action based on ARIA role.
+ const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
+ if (roleMapEntry && roleMapEntry->actionRule != eNoAction) {
+ return roleMapEntry->actionRule;
+ }
+
+ // Get an action based on ARIA attribute.
+ if (nsAccUtils::HasDefinedARIAToken(mContent, nsGkAtoms::aria_expanded)) {
+ return eExpandAction;
+ }
+
+ return eNoAction;
+}
+
+AccGroupInfo* LocalAccessible::GetGroupInfo() const {
+ if (mGroupInfo && !(mStateFlags & eGroupInfoDirty)) {
+ return mGroupInfo;
+ }
+
+ return nullptr;
+}
+
+AccGroupInfo* LocalAccessible::GetOrCreateGroupInfo() {
+ if (mGroupInfo) {
+ if (mStateFlags & eGroupInfoDirty) {
+ mGroupInfo->Update();
+ mStateFlags &= ~eGroupInfoDirty;
+ }
+
+ return mGroupInfo;
+ }
+
+ mGroupInfo = AccGroupInfo::CreateGroupInfo(this);
+ mStateFlags &= ~eGroupInfoDirty;
+ return mGroupInfo;
+}
+
+void LocalAccessible::SendCache(uint64_t aCacheDomain,
+ CacheUpdateType aUpdateType) {
+ if (!IPCAccessibilityActive() || !Document()) {
+ return;
+ }
+
+ DocAccessibleChild* ipcDoc = mDoc->IPCDoc();
+ if (!ipcDoc) {
+ // This means DocAccessible::DoInitialUpdate hasn't been called yet, which
+ // means the a11y tree hasn't been built yet. Therefore, this should only
+ // be possible if this is a DocAccessible.
+ MOZ_ASSERT(IsDoc(), "Called on a non-DocAccessible but IPCDoc is null");
+ return;
+ }
+
+ RefPtr<AccAttributes> fields =
+ BundleFieldsForCache(aCacheDomain, aUpdateType);
+ if (!fields->Count()) {
+ return;
+ }
+ nsTArray<CacheData> data;
+ data.AppendElement(CacheData(ID(), fields));
+ ipcDoc->SendCache(aUpdateType, data);
+
+ if (profiler_thread_is_being_profiled_for_markers()) {
+ nsAutoCString updateTypeStr;
+ if (aUpdateType == CacheUpdateType::Initial) {
+ updateTypeStr = "Initial";
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ updateTypeStr = "Update";
+ } else {
+ updateTypeStr = "Other";
+ }
+ PROFILER_MARKER_TEXT("LocalAccessible::SendCache", A11Y, {}, updateTypeStr);
+ }
+}
+
+already_AddRefed<AccAttributes> LocalAccessible::BundleFieldsForCache(
+ uint64_t aCacheDomain, CacheUpdateType aUpdateType) {
+ RefPtr<AccAttributes> fields = new AccAttributes();
+
+ // Caching name for text leaf Accessibles is redundant, since their name is
+ // always their text. Text gets handled below.
+ if (aCacheDomain & CacheDomain::NameAndDescription && !IsText()) {
+ nsString name;
+ int32_t nameFlag = Name(name);
+ if (nameFlag != eNameOK) {
+ fields->SetAttribute(nsGkAtoms::explicit_name, nameFlag);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::explicit_name, DeleteEntry());
+ }
+
+ if (IsTextField()) {
+ MOZ_ASSERT(mContent);
+ nsString placeholder;
+ // Only cache the placeholder separately if it isn't used as the name.
+ if (Elm()->GetAttr(nsGkAtoms::placeholder, placeholder) &&
+ name != placeholder) {
+ fields->SetAttribute(nsGkAtoms::placeholder, std::move(placeholder));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::placeholder, DeleteEntry());
+ }
+ }
+
+ if (!name.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::name, std::move(name));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::name, DeleteEntry());
+ }
+
+ nsString description;
+ Description(description);
+ if (!description.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::description, std::move(description));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::description, DeleteEntry());
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::Value) {
+ // We cache the text value in 3 cases:
+ // 1. Accessible is an HTML input type that holds a number.
+ // 2. Accessible has a numeric value and an aria-valuetext.
+ // 3. Accessible is an HTML input type that holds text.
+ // 4. Accessible is a link, in which case value is the target URL.
+ // ... for all other cases we divine the value remotely.
+ bool cacheValueText = false;
+ if (HasNumericValue()) {
+ fields->SetAttribute(nsGkAtoms::value, CurValue());
+ fields->SetAttribute(nsGkAtoms::max, MaxValue());
+ fields->SetAttribute(nsGkAtoms::min, MinValue());
+ fields->SetAttribute(nsGkAtoms::step, Step());
+ cacheValueText = NativeHasNumericValue() ||
+ (mContent->IsElement() &&
+ nsAccUtils::HasARIAAttr(mContent->AsElement(),
+ nsGkAtoms::aria_valuetext));
+ } else {
+ cacheValueText = IsTextField() || IsHTMLLink();
+ }
+
+ if (cacheValueText) {
+ nsString value;
+ Value(value);
+ if (!value.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::aria_valuetext, std::move(value));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::aria_valuetext, DeleteEntry());
+ }
+ }
+
+ if (IsImage()) {
+ // Cache the src of images. This is used by some clients to help remediate
+ // inaccessible images. If the image has a name, it's accessible, so this
+ // isn't necessary.
+ MOZ_ASSERT(mContent, "Image must have mContent");
+ nsAutoString name;
+ Name(name);
+ if (name.IsEmpty()) {
+ nsString src;
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::src, src);
+ if (!src.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::src, std::move(src));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::src, DeleteEntry());
+ }
+ }
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::Viewport && IsDoc()) {
+ // Construct the viewport cache for this document. This cache domain will
+ // only be requested after we finish painting.
+ DocAccessible* doc = AsDoc();
+ PresShell* presShell = doc->PresShellPtr();
+
+ if (nsIFrame* rootFrame = presShell->GetRootFrame()) {
+ nsTArray<nsIFrame*> frames;
+ nsIScrollableFrame* sf = presShell->GetRootScrollFrameAsScrollable();
+ nsRect scrollPort = sf ? sf->GetScrollPortRect() : rootFrame->GetRect();
+
+ nsLayoutUtils::GetFramesForArea(
+ RelativeTo{rootFrame}, scrollPort, frames,
+ {{// We only care about visible content for hittesting.
+ nsLayoutUtils::FrameForPointOption::OnlyVisible,
+ // This flag ensures the display lists are built, even if
+ // the page hasn't finished loading.
+ nsLayoutUtils::FrameForPointOption::IgnorePaintSuppression,
+ // Each doc should have its own viewport cache, so we can
+ // ignore cross-doc content as an optimization.
+ nsLayoutUtils::FrameForPointOption::IgnoreCrossDoc}});
+
+ nsTHashSet<LocalAccessible*> inViewAccs;
+ nsTArray<uint64_t> viewportCache(frames.Length());
+ // Layout considers table rows fully occluded by their containing cells.
+ // This means they don't have their own display list items, and they won't
+ // show up in the list returned from GetFramesForArea. To prevent table
+ // rows from appearing offscreen, we manually add any rows for which we
+ // have on-screen cells.
+ LocalAccessible* prevParentRow = nullptr;
+ for (nsIFrame* frame : frames) {
+ nsIContent* content = frame->GetContent();
+ if (!content) {
+ continue;
+ }
+
+ LocalAccessible* acc = doc->GetAccessible(content);
+ // The document should always be present at the end of the list, so
+ // including it is unnecessary and wasteful. We skip the document here
+ // and handle it as a fallback when hit testing.
+ if (!acc || acc == mDoc) {
+ continue;
+ }
+
+ if (acc->IsTextLeaf() && nsAccUtils::MustPrune(acc->LocalParent())) {
+ acc = acc->LocalParent();
+ }
+ if (acc->IsTableCell()) {
+ LocalAccessible* parent = acc->LocalParent();
+ if (parent && parent->IsTableRow() && parent != prevParentRow) {
+ // If we've entered a new row since the last cell we saw, add the
+ // previous parent row to our viewport cache here to maintain
+ // hittesting order. Keep track of the current parent row.
+ if (prevParentRow && inViewAccs.EnsureInserted(prevParentRow)) {
+ viewportCache.AppendElement(prevParentRow->ID());
+ }
+ prevParentRow = parent;
+ }
+ } else if (acc->IsTable()) {
+ // If we've encountered a table, we know we've already
+ // handled all of this table's content (because we're traversing
+ // in hittesting order). Add our table's final row to the viewport
+ // cache before adding the table itself. Reset our marker for the next
+ // table.
+ if (prevParentRow && inViewAccs.EnsureInserted(prevParentRow)) {
+ viewportCache.AppendElement(prevParentRow->ID());
+ }
+ prevParentRow = nullptr;
+ } else if (acc->IsImageMap()) {
+ // Layout doesn't walk image maps, so we do that
+ // manually here. We do this before adding the map itself
+ // so the children come earlier in the hittesting order.
+ for (uint32_t i = 0; i < acc->ChildCount(); i++) {
+ LocalAccessible* child = acc->LocalChildAt(i);
+ MOZ_ASSERT(child);
+ if (inViewAccs.EnsureInserted(child)) {
+ MOZ_ASSERT(!child->IsDoc());
+ viewportCache.AppendElement(child->ID());
+ }
+ }
+ } else if (acc->IsHTMLCombobox()) {
+ // Layout doesn't consider combobox lists (or their
+ // currently selected items) to be onscreen, but we do.
+ // Add those things manually here.
+ HTMLComboboxAccessible* combobox =
+ static_cast<HTMLComboboxAccessible*>(acc);
+ HTMLComboboxListAccessible* list = combobox->List();
+ LocalAccessible* currItem = combobox->SelectedOption();
+ // Preserve hittesting order by adding the item, then
+ // the list, and finally the combobox itself.
+ if (currItem && inViewAccs.EnsureInserted(currItem)) {
+ viewportCache.AppendElement(currItem->ID());
+ }
+ if (list && inViewAccs.EnsureInserted(list)) {
+ viewportCache.AppendElement(list->ID());
+ }
+ }
+
+ if (inViewAccs.EnsureInserted(acc)) {
+ MOZ_ASSERT(!acc->IsDoc());
+ viewportCache.AppendElement(acc->ID());
+ }
+ }
+
+ if (viewportCache.Length()) {
+ fields->SetAttribute(nsGkAtoms::viewport, std::move(viewportCache));
+ }
+ }
+ }
+
+ bool boundsChanged = false;
+ nsIFrame* frame = GetFrame();
+ if (aCacheDomain & CacheDomain::Bounds) {
+ nsRect newBoundsRect = ParentRelativeBounds();
+
+ // 1. Layout might notify us of a possible bounds change when the bounds
+ // haven't really changed. Therefore, we cache the last bounds we sent
+ // and don't send an update if they haven't changed.
+ // 2. For an initial cache push, we ignore 1) and always send the bounds.
+ // This handles the case where this LocalAccessible was moved (but not
+ // re-created). In that case, we will have cached bounds, but we currently
+ // do an initial cache push.
+ MOZ_ASSERT(aUpdateType == CacheUpdateType::Initial || mBounds.isSome(),
+ "Incremental cache push but mBounds is not set!");
+
+ if (OuterDocAccessible* doc = AsOuterDoc()) {
+ if (nsIFrame* docFrame = doc->GetFrame()) {
+ const nsMargin& newOffset = docFrame->GetUsedBorderAndPadding();
+ Maybe<nsMargin> currOffset = doc->GetCrossDocOffset();
+ if (!currOffset || *currOffset != newOffset) {
+ // OOP iframe docs can't compute their position within their
+ // cross-proc parent, so we have to manually cache that offset
+ // on the parent (outer doc) itself. For simplicity and consistency,
+ // we do this here for both OOP and in-process iframes. For in-process
+ // iframes, this also avoids the need to push a cache update for the
+ // embedded document when the iframe changes its padding, gets
+ // re-created, etc. Similar to bounds, we maintain a local cache and a
+ // remote cache to avoid sending redundant updates.
+ doc->SetCrossDocOffset(newOffset);
+ nsTArray<int32_t> offsetArray(2);
+ offsetArray.AppendElement(newOffset.Side(eSideLeft)); // X offset
+ offsetArray.AppendElement(newOffset.Side(eSideTop)); // Y offset
+ fields->SetAttribute(nsGkAtoms::crossorigin, std::move(offsetArray));
+ }
+ }
+ }
+
+ boundsChanged = aUpdateType == CacheUpdateType::Initial ||
+ !newBoundsRect.IsEqualEdges(mBounds.value());
+ if (boundsChanged) {
+ mBounds = Some(newBoundsRect);
+
+ nsTArray<int32_t> boundsArray(4);
+
+ boundsArray.AppendElement(newBoundsRect.x);
+ boundsArray.AppendElement(newBoundsRect.y);
+ boundsArray.AppendElement(newBoundsRect.width);
+ boundsArray.AppendElement(newBoundsRect.height);
+
+ fields->SetAttribute(nsGkAtoms::relativeBounds, std::move(boundsArray));
+ }
+
+ if (frame && frame->ScrollableOverflowRect().IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::clip_rule, true);
+ } else if (aUpdateType != CacheUpdateType::Initial) {
+ fields->SetAttribute(nsGkAtoms::clip_rule, DeleteEntry());
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::Text) {
+ if (!HasChildren()) {
+ // We only cache text and line offsets on leaf Accessibles.
+ // Only text Accessibles can have actual text.
+ if (IsText()) {
+ nsString text;
+ AppendTextTo(text);
+ fields->SetAttribute(nsGkAtoms::text, std::move(text));
+ TextLeafPoint point(this, 0);
+ RefPtr<AccAttributes> attrs = point.GetTextAttributesLocalAcc(
+ /* aIncludeDefaults */ false);
+ fields->SetAttribute(nsGkAtoms::style, std::move(attrs));
+ }
+ }
+ if (HyperTextAccessible* ht = AsHyperText()) {
+ RefPtr<AccAttributes> attrs = ht->DefaultTextAttributes();
+ fields->SetAttribute(nsGkAtoms::style, std::move(attrs));
+ }
+ }
+
+ // If text changes, we must also update spelling errors.
+ if (aCacheDomain & (CacheDomain::Spelling | CacheDomain::Text) &&
+ IsTextLeaf()) {
+ auto spellingErrors = TextLeafPoint::GetSpellingErrorOffsets(this);
+ if (!spellingErrors.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::spelling, std::move(spellingErrors));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::spelling, DeleteEntry());
+ }
+ }
+
+ if (aCacheDomain & (CacheDomain::Text | CacheDomain::Bounds) &&
+ !HasChildren()) {
+ // We cache line start offsets for both text and non-text leaf Accessibles
+ // because non-text leaf Accessibles can still start a line.
+ TextLeafPoint lineStart =
+ TextLeafPoint(this, 0).FindNextLineStartSameLocalAcc(
+ /* aIncludeOrigin */ true);
+ int32_t lineStartOffset = lineStart ? lineStart.mOffset : -1;
+ // We push line starts and text bounds in two cases:
+ // 1. Text or bounds changed, which means it's very likely that line starts
+ // and text bounds changed too.
+ // 2. CacheDomain::Bounds was requested (indicating that the frame was
+ // reflowed) but the bounds didn't actually change. This can happen when
+ // the spanned text is non-rectangular. For example, an Accessible might
+ // cover two characters on one line and a single character on another line.
+ // An insertion in a previous text node might cause it to shift such that it
+ // now covers a single character on the first line and two characters on the
+ // second line. Its bounding rect will be the same both before and after the
+ // insertion. In this case, we use the first line start to determine whether
+ // there was a change. This should be safe because the text didn't change in
+ // this Accessible, so if the first line start doesn't shift, none of them
+ // should shift.
+ if (aCacheDomain & CacheDomain::Text || boundsChanged ||
+ mFirstLineStart != lineStartOffset) {
+ mFirstLineStart = lineStartOffset;
+ nsTArray<int32_t> lineStarts;
+ for (; lineStart;
+ lineStart = lineStart.FindNextLineStartSameLocalAcc(false)) {
+ lineStarts.AppendElement(lineStart.mOffset);
+ }
+ if (!lineStarts.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::line, std::move(lineStarts));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::line, DeleteEntry());
+ }
+
+ if (frame && frame->IsTextFrame()) {
+ if (nsTextFrame* currTextFrame = do_QueryFrame(frame)) {
+ nsTArray<int32_t> charData(nsAccUtils::TextLength(this) *
+ kNumbersInRect);
+ // Continuation offsets are calculated relative to the primary frame.
+ // However, the acc's bounds are calculated using
+ // GetAllInFlowRectsUnion. For wrapped text which starts part way
+ // through a line, this might mean the top left of the acc is
+ // different to the top left of the primary frame. This also happens
+ // when the primary frame is empty (e.g. a blank line at the start of
+ // pre-formatted text), since the union rect will exclude the origin
+ // in that case. Calculate the offset from the acc's rect to the
+ // primary frame's rect.
+ nsRect accOffset =
+ nsLayoutUtils::GetAllInFlowRectsUnion(frame, frame);
+ while (currTextFrame) {
+ nsPoint contOffset = currTextFrame->GetOffsetTo(frame);
+ contOffset -= accOffset.TopLeft();
+ int32_t length = currTextFrame->GetContentLength();
+ nsTArray<nsRect> charBounds(length);
+ currTextFrame->GetCharacterRectsInRange(
+ currTextFrame->GetContentOffset(), length, charBounds);
+ for (nsRect& charRect : charBounds) {
+ // We expect each char rect to be relative to the text leaf
+ // acc this text lives in. Unfortunately, GetCharacterRectsInRange
+ // returns rects relative to their continuation. Add the
+ // continuation's relative position here to make our final
+ // rect relative to the text leaf acc.
+ charRect.MoveBy(contOffset);
+ charData.AppendElement(charRect.x);
+ charData.AppendElement(charRect.y);
+ charData.AppendElement(charRect.width);
+ charData.AppendElement(charRect.height);
+ }
+ currTextFrame = currTextFrame->GetNextContinuation();
+ }
+ if (charData.Length()) {
+ fields->SetAttribute(nsGkAtoms::characterData, std::move(charData));
+ }
+ }
+ }
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::TransformMatrix) {
+ bool transformed = false;
+ if (frame && frame->IsTransformed()) {
+ // This matrix is only valid when applied to CSSPixel points/rects
+ // in the coordinate space of `frame`.
+ gfx::Matrix4x4 mtx = nsDisplayTransform::GetResultingTransformMatrix(
+ frame, nsPoint(0, 0), AppUnitsPerCSSPixel(),
+ nsDisplayTransform::INCLUDE_PERSPECTIVE |
+ nsDisplayTransform::OFFSET_BY_ORIGIN);
+ // We might get back the identity matrix. This can happen if there is no
+ // actual transform. For example, if an element has
+ // will-change: transform, nsIFrame::IsTransformed will return true, but
+ // this doesn't necessarily mean there is a transform right now.
+ // Applying the identity matrix is effectively a no-op, so there's no
+ // point caching it.
+ transformed = !mtx.IsIdentity();
+ if (transformed) {
+ UniquePtr<gfx::Matrix4x4> ptr = MakeUnique<gfx::Matrix4x4>(mtx);
+ fields->SetAttribute(nsGkAtoms::transform, std::move(ptr));
+ }
+ }
+ if (!transformed && aUpdateType == CacheUpdateType::Update) {
+ // Otherwise, if we're bundling a transform update but this
+ // frame isn't transformed (or doesn't exist), we need
+ // to send a DeleteEntry() to remove any
+ // transform that was previously cached for this frame.
+ fields->SetAttribute(nsGkAtoms::transform, DeleteEntry());
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::ScrollPosition) {
+ nsPoint scrollPosition;
+ std::tie(scrollPosition, std::ignore) = mDoc->ComputeScrollData(this);
+ if (scrollPosition.x || scrollPosition.y) {
+ nsTArray<int32_t> positionArr(2);
+ positionArr.AppendElement(scrollPosition.x);
+ positionArr.AppendElement(scrollPosition.y);
+ fields->SetAttribute(nsGkAtoms::scrollPosition, std::move(positionArr));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::scrollPosition, DeleteEntry());
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::DOMNodeIDAndClass && mContent) {
+ nsAtom* id = mContent->GetID();
+ if (id) {
+ fields->SetAttribute(nsGkAtoms::id, id);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::id, DeleteEntry());
+ }
+ if (auto* el = dom::Element::FromNodeOrNull(mContent)) {
+ nsAutoString className;
+ el->GetClassName(className);
+ if (!className.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::_class, std::move(className));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::_class, DeleteEntry());
+ }
+ }
+ }
+
+ // State is only included in the initial push. Thereafter, cached state is
+ // updated via events.
+ if (aCacheDomain & CacheDomain::State) {
+ if (aUpdateType == CacheUpdateType::Initial) {
+ // Most states are updated using state change events, so we only send
+ // these for the initial cache push.
+ uint64_t state = State();
+ // Exclude states which must be calculated by RemoteAccessible.
+ state &= ~kRemoteCalculatedStates;
+ fields->SetAttribute(nsGkAtoms::state, state);
+ }
+ // If aria-selected isn't specified, there may be no SELECTED state.
+ // However, aria-selected can be implicit in some cases when an item is
+ // focused. We don't want to do this if aria-selected is explicitly
+ // set to "false", so we need to differentiate between false and unset.
+ if (auto ariaSelected = ARIASelected()) {
+ fields->SetAttribute(nsGkAtoms::aria_selected, *ariaSelected);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::aria_selected, DeleteEntry()); // Unset.
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::GroupInfo && mContent) {
+ for (nsAtom* attr : {nsGkAtoms::aria_level, nsGkAtoms::aria_setsize,
+ nsGkAtoms::aria_posinset}) {
+ int32_t value = 0;
+ if (nsCoreUtils::GetUIntAttr(mContent, attr, &value)) {
+ fields->SetAttribute(attr, value);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(attr, DeleteEntry());
+ }
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::Actions) {
+ if (HasPrimaryAction()) {
+ // Here we cache the primary action.
+ nsAutoString actionName;
+ ActionNameAt(0, actionName);
+ RefPtr<nsAtom> actionAtom = NS_Atomize(actionName);
+ fields->SetAttribute(nsGkAtoms::action, actionAtom);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::action, DeleteEntry());
+ }
+
+ if (ImageAccessible* imgAcc = AsImage()) {
+ // Here we cache the showlongdesc action.
+ if (imgAcc->HasLongDesc()) {
+ fields->SetAttribute(nsGkAtoms::longdesc, true);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::longdesc, DeleteEntry());
+ }
+ }
+
+ KeyBinding accessKey = AccessKey();
+ if (!accessKey.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::accesskey, accessKey.Serialize());
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::accesskey, DeleteEntry());
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::Style) {
+ if (RefPtr<nsAtom> display = DisplayStyle()) {
+ fields->SetAttribute(nsGkAtoms::display, display);
+ }
+
+ float opacity = Opacity();
+ if (opacity != 1.0f) {
+ fields->SetAttribute(nsGkAtoms::opacity, opacity);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::opacity, DeleteEntry());
+ }
+
+ if (frame &&
+ frame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
+ nsLayoutUtils::IsReallyFixedPos(frame)) {
+ fields->SetAttribute(nsGkAtoms::position, nsGkAtoms::fixed);
+ } else if (aUpdateType != CacheUpdateType::Initial) {
+ fields->SetAttribute(nsGkAtoms::position, DeleteEntry());
+ }
+
+ if (frame) {
+ nsAutoCString overflow;
+ frame->Style()->GetComputedPropertyValue(eCSSProperty_overflow, overflow);
+ RefPtr<nsAtom> overflowAtom = NS_Atomize(overflow);
+ if (overflowAtom == nsGkAtoms::hidden) {
+ fields->SetAttribute(nsGkAtoms::overflow, nsGkAtoms::hidden);
+ } else if (aUpdateType != CacheUpdateType::Initial) {
+ fields->SetAttribute(nsGkAtoms::overflow, DeleteEntry());
+ }
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::Table) {
+ if (auto* table = HTMLTableAccessible::GetFrom(this)) {
+ if (table->IsProbablyLayoutTable()) {
+ fields->SetAttribute(nsGkAtoms::layout_guess, true);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::layout_guess, DeleteEntry());
+ }
+ } else if (auto* cell = HTMLTableCellAccessible::GetFrom(this)) {
+ // For HTML table cells, we must use the HTMLTableCellAccessible
+ // GetRow/ColExtent methods rather than using the DOM attributes directly.
+ // This is because of things like rowspan="0" which depend on knowing
+ // about thead, tbody, etc., which is info we don't have in the a11y tree.
+ int32_t value = static_cast<int32_t>(cell->RowExtent());
+ MOZ_ASSERT(value > 0);
+ if (value > 1) {
+ fields->SetAttribute(nsGkAtoms::rowspan, value);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::rowspan, DeleteEntry());
+ }
+ value = static_cast<int32_t>(cell->ColExtent());
+ MOZ_ASSERT(value > 0);
+ if (value > 1) {
+ fields->SetAttribute(nsGkAtoms::colspan, value);
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::colspan, DeleteEntry());
+ }
+ if (mContent->AsElement()->HasAttr(kNameSpaceID_None,
+ nsGkAtoms::headers)) {
+ nsTArray<uint64_t> headers;
+ IDRefsIterator iter(mDoc, mContent, nsGkAtoms::headers);
+ while (LocalAccessible* cell = iter.Next()) {
+ if (cell->IsTableCell()) {
+ headers.AppendElement(cell->ID());
+ }
+ }
+ fields->SetAttribute(nsGkAtoms::headers, std::move(headers));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::headers, DeleteEntry());
+ }
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::ARIA && mContent && mContent->IsElement()) {
+ // We use a nested AccAttributes to make cache updates simpler. Rather than
+ // managing individual removals, we just replace or remove the entire set of
+ // ARIA attributes.
+ RefPtr<AccAttributes> ariaAttrs;
+ aria::AttrIterator attrIt(mContent);
+ while (attrIt.Next()) {
+ if (!ariaAttrs) {
+ ariaAttrs = new AccAttributes();
+ }
+ attrIt.ExposeAttr(ariaAttrs);
+ }
+ if (ariaAttrs) {
+ fields->SetAttribute(nsGkAtoms::aria, std::move(ariaAttrs));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(nsGkAtoms::aria, DeleteEntry());
+ }
+ }
+
+ if (aCacheDomain & CacheDomain::Relations && mContent) {
+ if (IsHTMLRadioButton() ||
+ (mContent->IsElement() &&
+ mContent->AsElement()->IsHTMLElement(nsGkAtoms::a))) {
+ // HTML radio buttons with the same name should be grouped
+ // and returned together when their MEMBER_OF relation is
+ // requested. Computing LINKS_TO also requires we cache `name` on
+ // anchor elements.
+ nsString name;
+ mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::name, name);
+ if (!name.IsEmpty()) {
+ fields->SetAttribute(nsGkAtoms::attributeName, std::move(name));
+ } else if (aUpdateType != CacheUpdateType::Initial) {
+ // It's possible we used to have a name and it's since been
+ // removed. Send a delete entry.
+ fields->SetAttribute(nsGkAtoms::attributeName, DeleteEntry());
+ }
+ }
+
+ for (auto const& data : kRelationTypeAtoms) {
+ nsTArray<uint64_t> ids;
+ nsStaticAtom* const relAtom = data.mAtom;
+
+ Relation rel;
+ if (data.mType == RelationType::LABEL_FOR) {
+ // Labels are a special case -- we need to validate that the target of
+ // their `for` attribute is in fact labelable. DOM checks this when we
+ // call GetControl(). If a label contains an element we will return it
+ // here.
+ if (dom::HTMLLabelElement* labelEl =
+ dom::HTMLLabelElement::FromNode(mContent)) {
+ rel.AppendTarget(mDoc, labelEl->GetControl());
+ }
+ } else {
+ // We use an IDRefsIterator here instead of calling RelationByType
+ // directly because we only want to cache explicit relations. Implicit
+ // relations will be computed and stored separately in the parent
+ // process.
+ rel.AppendIter(new IDRefsIterator(mDoc, mContent, relAtom));
+ }
+
+ while (LocalAccessible* acc = rel.LocalNext()) {
+ ids.AppendElement(acc->ID());
+ }
+ if (ids.Length()) {
+ fields->SetAttribute(relAtom, std::move(ids));
+ } else if (aUpdateType == CacheUpdateType::Update) {
+ fields->SetAttribute(relAtom, DeleteEntry());
+ }
+ }
+ }
+
+#if defined(XP_WIN)
+ if (aCacheDomain & CacheDomain::InnerHTML && HasOwnContent() &&
+ mContent->IsMathMLElement(nsGkAtoms::math)) {
+ nsString innerHTML;
+ mContent->AsElement()->GetInnerHTML(innerHTML, IgnoreErrors());
+ fields->SetAttribute(nsGkAtoms::html, std::move(innerHTML));
+ }
+#endif // defined(XP_WIN)
+
+ if (aUpdateType == CacheUpdateType::Initial) {
+ // Add fields which never change and thus only need to be included in the
+ // initial cache push.
+ if (mContent && mContent->IsElement()) {
+ fields->SetAttribute(nsGkAtoms::tag, mContent->NodeInfo()->NameAtom());
+
+ dom::Element* el = mContent->AsElement();
+ if (IsTextField() || IsDateTimeField()) {
+ // Cache text input types. Accessible is recreated if this changes,
+ // so it is considered immutable.
+ if (const nsAttrValue* attr = el->GetParsedAttr(nsGkAtoms::type)) {
+ RefPtr<nsAtom> inputType = attr->GetAsAtom();
+ if (inputType) {
+ fields->SetAttribute(nsGkAtoms::textInputType, inputType);
+ }
+ }
+ }
+
+ // Changing the role attribute currently re-creates the Accessible, so
+ // it's immutable in the cache.
+ if (const nsRoleMapEntry* roleMap = ARIARoleMap()) {
+ // Most of the time, the role attribute is a single, known role. We
+ // already send the map index, so we don't need to double up.
+ if (!nsAccUtils::ARIAAttrValueIs(el, nsGkAtoms::role, roleMap->roleAtom,
+ eIgnoreCase)) {
+ // Multiple roles or unknown roles are rare, so just send them as a
+ // string.
+ nsAutoString role;
+ nsAccUtils::GetARIAAttr(el, nsGkAtoms::role, role);
+ fields->SetAttribute(nsGkAtoms::role, std::move(role));
+ }
+ }
+ }
+
+ if (frame) {
+ // Note our frame's current computed style so we can track style changes
+ // later on.
+ mOldComputedStyle = frame->Style();
+ if (frame->IsTransformed()) {
+ mStateFlags |= eOldFrameHasValidTransformStyle;
+ } else {
+ mStateFlags &= ~eOldFrameHasValidTransformStyle;
+ }
+ }
+
+ if (IsDoc()) {
+ if (PresShell* presShell = AsDoc()->PresShellPtr()) {
+ // Send the initial resolution of the document. When this changes, we
+ // will ne notified via nsAS::NotifyOfResolutionChange
+ float resolution = presShell->GetResolution();
+ fields->SetAttribute(nsGkAtoms::resolution, resolution);
+ int32_t appUnitsPerDevPixel =
+ presShell->GetPresContext()->AppUnitsPerDevPixel();
+ fields->SetAttribute(nsGkAtoms::_moz_device_pixel_ratio,
+ appUnitsPerDevPixel);
+ }
+
+ nsString mimeType;
+ AsDoc()->MimeType(mimeType);
+ fields->SetAttribute(nsGkAtoms::headerContentType, std::move(mimeType));
+ }
+ }
+
+ if ((aCacheDomain & (CacheDomain::Text | CacheDomain::ScrollPosition) ||
+ boundsChanged) &&
+ mDoc) {
+ mDoc->SetViewportCacheDirty(true);
+ }
+
+ return fields.forget();
+}
+
+void LocalAccessible::MaybeQueueCacheUpdateForStyleChanges() {
+ // mOldComputedStyle might be null if the initial cache hasn't been sent yet.
+ // In that case, there is nothing to do here.
+ if (!IPCAccessibilityActive() || !mOldComputedStyle) {
+ return;
+ }
+
+ if (nsIFrame* frame = GetFrame()) {
+ const ComputedStyle* newStyle = frame->Style();
+
+ nsAutoCString oldOverflow, newOverflow;
+ mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_overflow,
+ oldOverflow);
+ newStyle->GetComputedPropertyValue(eCSSProperty_overflow, newOverflow);
+
+ if (oldOverflow != newOverflow) {
+ RefPtr<nsAtom> oldAtom = NS_Atomize(oldOverflow);
+ RefPtr<nsAtom> newAtom = NS_Atomize(newOverflow);
+ if (oldAtom == nsGkAtoms::hidden || newAtom == nsGkAtoms::hidden) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::Style);
+ }
+ }
+
+ nsAutoCString oldDisplay, newDisplay;
+ mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_display,
+ oldDisplay);
+ newStyle->GetComputedPropertyValue(eCSSProperty_display, newDisplay);
+
+ nsAutoCString oldOpacity, newOpacity;
+ mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_opacity,
+ oldOpacity);
+ newStyle->GetComputedPropertyValue(eCSSProperty_opacity, newOpacity);
+
+ if (oldDisplay != newDisplay || oldOpacity != newOpacity) {
+ // CacheDomain::Style covers both display and opacity, so if
+ // either property has changed, send an update for the entire domain.
+ mDoc->QueueCacheUpdate(this, CacheDomain::Style);
+ }
+
+ nsAutoCString oldPosition, newPosition;
+ mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_position,
+ oldPosition);
+ newStyle->GetComputedPropertyValue(eCSSProperty_position, newPosition);
+
+ if (oldPosition != newPosition) {
+ RefPtr<nsAtom> oldAtom = NS_Atomize(oldPosition);
+ RefPtr<nsAtom> newAtom = NS_Atomize(newPosition);
+ if (oldAtom == nsGkAtoms::fixed || newAtom == nsGkAtoms::fixed) {
+ mDoc->QueueCacheUpdate(this, CacheDomain::Style);
+ }
+ }
+
+ bool newHasValidTransformStyle =
+ newStyle->StyleDisplay()->HasTransform(frame);
+ bool oldHasValidTransformStyle =
+ (mStateFlags & eOldFrameHasValidTransformStyle) != 0;
+
+ // We should send a transform update if we're adding or
+ // removing transform styling altogether.
+ bool sendTransformUpdate =
+ newHasValidTransformStyle || oldHasValidTransformStyle;
+
+ if (newHasValidTransformStyle && oldHasValidTransformStyle) {
+ // If we continue to have transform styling, verify
+ // our transform has actually changed.
+ nsChangeHint transformHint =
+ newStyle->StyleDisplay()->CalcTransformPropertyDifference(
+ *mOldComputedStyle->StyleDisplay());
+ // If this hint exists, it implies we found a property difference
+ sendTransformUpdate = !!transformHint;
+ }
+
+ if (sendTransformUpdate) {
+ // If our transform matrix has changed, it's possible our
+ // viewport cache has also changed.
+ mDoc->SetViewportCacheDirty(true);
+ // Queuing a cache update for the TransformMatrix domain doesn't
+ // necessarily mean we'll send the matrix itself, we may
+ // send a DeleteEntry() instead. See BundleFieldsForCache for
+ // more information.
+ mDoc->QueueCacheUpdate(this, CacheDomain::TransformMatrix);
+ }
+
+ mOldComputedStyle = newStyle;
+ if (newHasValidTransformStyle) {
+ mStateFlags |= eOldFrameHasValidTransformStyle;
+ } else {
+ mStateFlags &= ~eOldFrameHasValidTransformStyle;
+ }
+ }
+}
+
+nsAtom* LocalAccessible::TagName() const {
+ return mContent && mContent->IsElement() ? mContent->NodeInfo()->NameAtom()
+ : nullptr;
+}
+
+already_AddRefed<nsAtom> LocalAccessible::InputType() const {
+ if (!IsTextField() && !IsDateTimeField()) {
+ return nullptr;
+ }
+
+ dom::Element* el = mContent->AsElement();
+ if (const nsAttrValue* attr = el->GetParsedAttr(nsGkAtoms::type)) {
+ RefPtr<nsAtom> inputType = attr->GetAsAtom();
+ return inputType.forget();
+ }
+
+ return nullptr;
+}
+
+already_AddRefed<nsAtom> LocalAccessible::DisplayStyle() const {
+ dom::Element* elm = Elm();
+ if (!elm) {
+ return nullptr;
+ }
+ if (elm->IsHTMLElement(nsGkAtoms::area)) {
+ // This is an image map area. CSS is irrelevant here.
+ return nullptr;
+ }
+ RefPtr<const ComputedStyle> style =
+ nsComputedDOMStyle::GetComputedStyleNoFlush(elm);
+ if (!style) {
+ // The element is not styled, maybe not in the flat tree?
+ return nullptr;
+ }
+ nsAutoCString value;
+ style->GetComputedPropertyValue(eCSSProperty_display, value);
+ return NS_Atomize(value);
+}
+
+float LocalAccessible::Opacity() const {
+ if (nsIFrame* frame = GetFrame()) {
+ return frame->StyleEffects()->mOpacity;
+ }
+
+ return 1.0f;
+}
+
+void LocalAccessible::DOMNodeID(nsString& aID) const {
+ aID.Truncate();
+ if (mContent) {
+ if (nsAtom* id = mContent->GetID()) {
+ id->ToString(aID);
+ }
+ }
+}
+
+void LocalAccessible::LiveRegionAttributes(nsAString* aLive,
+ nsAString* aRelevant,
+ Maybe<bool>* aAtomic,
+ nsAString* aBusy) const {
+ dom::Element* el = Elm();
+ if (!el) {
+ return;
+ }
+ if (aLive) {
+ nsAccUtils::GetARIAAttr(el, nsGkAtoms::aria_live, *aLive);
+ }
+ if (aRelevant) {
+ nsAccUtils::GetARIAAttr(el, nsGkAtoms::aria_relevant, *aRelevant);
+ }
+ if (aAtomic) {
+ // XXX We ignore aria-atomic="false", but this probably doesn't conform to
+ // the spec.
+ if (nsAccUtils::ARIAAttrValueIs(el, nsGkAtoms::aria_atomic,
+ nsGkAtoms::_true, eCaseMatters)) {
+ *aAtomic = Some(true);
+ }
+ }
+ if (aBusy) {
+ nsAccUtils::GetARIAAttr(el, nsGkAtoms::aria_busy, *aBusy);
+ }
+}
+
+Maybe<bool> LocalAccessible::ARIASelected() const {
+ if (dom::Element* el = Elm()) {
+ nsStaticAtom* atom =
+ nsAccUtils::NormalizeARIAToken(el, nsGkAtoms::aria_selected);
+ if (atom == nsGkAtoms::_true) {
+ return Some(true);
+ }
+ if (atom == nsGkAtoms::_false) {
+ return Some(false);
+ }
+ }
+ return Nothing();
+}
+
+void LocalAccessible::StaticAsserts() const {
+ static_assert(
+ eLastStateFlag <= (1 << kStateFlagsBits) - 1,
+ "LocalAccessible::mStateFlags was oversized by eLastStateFlag!");
+ static_assert(
+ eLastContextFlag <= (1 << kContextFlagsBits) - 1,
+ "LocalAccessible::mContextFlags was oversized by eLastContextFlag!");
+}
+
+TableAccessible* LocalAccessible::AsTable() {
+ if (IsTable() && !mContent->IsXULElement()) {
+ return CachedTableAccessible::GetFrom(this);
+ }
+ return nullptr;
+}
+
+TableCellAccessible* LocalAccessible::AsTableCell() {
+ if (IsTableCell() && !mContent->IsXULElement()) {
+ return CachedTableCellAccessible::GetFrom(this);
+ }
+ return nullptr;
+}
+
+Maybe<int32_t> LocalAccessible::GetIntARIAAttr(nsAtom* aAttrName) const {
+ if (mContent) {
+ int32_t val;
+ if (nsCoreUtils::GetUIntAttr(mContent, aAttrName, &val)) {
+ return Some(val);
+ }
+ // XXX Handle attributes that allow -1; e.g. aria-row/colcount.
+ }
+ return Nothing();
+}