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fune/accessible/generic/LocalAccessible.cpp
Nathan LaPre dbe5ffd60b Bug 1778795: role="form" with empty accessible name returns native role, r=Jamie 
The ARIA spec requires that, for certain landmark roles with no author-specified
names, user agents must treat such elements as if no role had been provided.
This revision accomplishes that task by carving out an exception in
ARIATransformRole and ComputeARIARole for roles::FORM, similar to the existing
carveout for roles::REGION. This revision also implements a NameIsEmpty function
which is helpful for checking name emptiness (since we do this in a few places)
without leaving a "name" variable on the stack. Finally, this revision updates a
expected WPT failure (by removing it).

Differential Revision: https://phabricator.services.mozilla.com/D202778
2024-02-29 00:33:10 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "AccEvent.h"
#include "LocalAccessible-inl.h"
#include "EmbeddedObjCollector.h"
#include "AccGroupInfo.h"
#include "AccIterator.h"
#include "CachedTableAccessible.h"
#include "DocAccessible-inl.h"
#include "mozilla/a11y/AccAttributes.h"
#include "mozilla/a11y/DocAccessibleChild.h"
#include "mozilla/a11y/Platform.h"
#include "nsAccUtils.h"
#include "nsAccessibilityService.h"
#include "ApplicationAccessible.h"
#include "nsGenericHTMLElement.h"
#include "NotificationController.h"
#include "nsEventShell.h"
#include "nsTextEquivUtils.h"
#include "EventTree.h"
#include "OuterDocAccessible.h"
#include "Pivot.h"
#include "Relation.h"
#include "mozilla/a11y/Role.h"
#include "RootAccessible.h"
#include "States.h"
#include "TextLeafRange.h"
#include "TextRange.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 "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 "nsAtom.h"
#include "nsContainerFrame.h"
#include "mozilla/Assertions.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/PresShell.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/dom/Element.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)
: mContent(aContent),
mDoc(aDoc),
mParent(nullptr),
mIndexInParent(-1),
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(nsGkAtoms::title, aName)) {
aName.CompressWhitespace();
return eNameFromTooltip;
}
} else if (mContent->IsXULElement()) {
if (mContent->AsElement()->GetAttr(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(nsGkAtoms::title, aDescription);
} else if (mContent->IsXULElement()) {
mContent->AsElement()->GetAttr(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(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() ||
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(boundingFrame)) {
// Constructing a bounding box across a frame that has an IB split means
// the origin is likely be different from that of boundingFrame.
// Descendants will need their parent-relative bounds adjusted
// accordingly, since parent-relative bounds are constructed to the
// bounding box of the entire element and not each individual IB split
// frame. In the case that boundingFrame's 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()) {
// The origin of boundingUnion is relative to boundingFrame, meaning
// when we call MoveBy on result with this value we're offsetting
// `result` by the distance boundingFrame's origin was moved to
// construct its bounding box.
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(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(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(),
event->IsFromUserInput());
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_FOCUS:
ipcDoc->SendFocusEvent(id);
break;
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));
}
if (IPCAccessibilityActive()) {
return NS_OK;
}
if (IsDefunct()) {
// This could happen if there is an XPCOM observer, since script might run
// which mutates the tree.
return NS_OK;
}
LocalAccessible* target = aEvent->GetAccessible();
switch (aEvent->GetEventType()) {
case nsIAccessibleEvent::EVENT_SHOW:
PlatformShowHideEvent(target, target->LocalParent(), true,
aEvent->IsFromUserInput());
break;
case nsIAccessibleEvent::EVENT_HIDE:
PlatformShowHideEvent(target, target->LocalParent(), false,
aEvent->IsFromUserInput());
break;
case nsIAccessibleEvent::EVENT_STATE_CHANGE: {
AccStateChangeEvent* event = downcast_accEvent(aEvent);
PlatformStateChangeEvent(target, event->GetState(),
event->IsStateEnabled());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
AccCaretMoveEvent* event = downcast_accEvent(aEvent);
LayoutDeviceIntRect rect;
// The caret rect is only used on Windows, so just pass an empty rect on
// other platforms.
// XXX We pass an empty rect on Windows as well because
// AccessibleWrap::UpdateSystemCaretFor currently needs to call
// HyperTextAccessible::GetCaretRect again to get the widget and there's
// no point calling it twice.
PlatformCaretMoveEvent(
target, event->GetCaretOffset(), event->IsSelectionCollapsed(),
event->GetGranularity(), rect, event->IsFromUserInput());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
AccTextChangeEvent* event = downcast_accEvent(aEvent);
const nsString& text = event->ModifiedText();
PlatformTextChangeEvent(target, 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);
PlatformSelectionEvent(target, selEvent->Widget(),
aEvent->GetEventType());
break;
}
case nsIAccessibleEvent::EVENT_FOCUS: {
LayoutDeviceIntRect rect;
// The caret rect is only used on Windows, so just pass an empty rect on
// other platforms.
#ifdef XP_WIN
if (HyperTextAccessible* text = target->AsHyperText()) {
nsIWidget* widget = nullptr;
rect = text->GetCaretRect(&widget);
}
#endif
PlatformFocusEvent(target, rect);
break;
}
#if defined(ANDROID)
case nsIAccessibleEvent::EVENT_SCROLLING_END:
case nsIAccessibleEvent::EVENT_SCROLLING: {
AccScrollingEvent* scrollingEvent = downcast_accEvent(aEvent);
PlatformScrollingEvent(
target, aEvent->GetEventType(), scrollingEvent->ScrollX(),
scrollingEvent->ScrollY(), scrollingEvent->MaxScrollX(),
scrollingEvent->MaxScrollY());
break;
}
case nsIAccessibleEvent::EVENT_ANNOUNCEMENT: {
AccAnnouncementEvent* announcementEvent = downcast_accEvent(aEvent);
PlatformAnnouncementEvent(target, announcementEvent->Announcement(),
announcementEvent->Priority());
break;
}
#endif // defined(ANDROID)
#if defined(MOZ_WIDGET_COCOA)
case nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED: {
AccTextSelChangeEvent* textSelChangeEvent = downcast_accEvent(aEvent);
AutoTArray<TextRange, 1> ranges;
textSelChangeEvent->SelectionRanges(&ranges);
PlatformTextSelectionChangeEvent(target, ranges);
break;
}
#endif // defined(MOZ_WIDGET_COCOA)
default:
PlatformEvent(target, aEvent->GetEventType());
}
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(nsGkAtoms::_class, _class)) {
attributes->SetAttribute(nsGkAtoms::_class, std::move(_class));
}
// Expose tag.
attributes->SetAttribute(nsGkAtoms::tag, mContent->NodeInfo()->NameAtom());
if (auto htmlElement = nsGenericHTMLElement::FromNode(mContent)) {
// Expose draggable object attribute.
if (htmlElement->Draggable()) {
attributes->SetAttribute(nsGkAtoms::draggable, true);
}
nsString popover;
htmlElement->GetPopover(popover);
if (!popover.IsEmpty()) {
attributes->SetAttribute(nsGkAtoms::ispopup, std::move(popover));
}
}
// 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();
}
// Expose 'display' attribute.
if (RefPtr<nsAtom> display = DisplayStyle()) {
attributes->SetAttribute(nsGkAtoms::display, display);
}
const ComputedStyle& style = *f->Style();
auto Atomize = [&](nsCSSPropertyID aId) -> RefPtr<nsAtom> {
nsAutoCString value;
style.GetComputedPropertyValue(aId, value);
return NS_Atomize(value);
};
// Expose 'text-align' attribute.
attributes->SetAttribute(nsGkAtoms::textAlign,
Atomize(eCSSProperty_text_align));
// Expose 'text-indent' attribute.
attributes->SetAttribute(nsGkAtoms::textIndent,
Atomize(eCSSProperty_text_indent));
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 ||
aAttribute == nsGkAtoms::popovertarget;
}
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)) {
mDoc->QueueCacheUpdate(this, CacheDomain::Value);
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.
mDoc->QueueCacheUpdate(this, CacheDomain::Value);
}
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.
mDoc->QueueCacheUpdate(this, CacheDomain::Actions);
}
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::popovertarget) {
mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
return;
}
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) {
mDoc->QueueCacheUpdate(this, CacheDomain::GroupInfo);
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 form or region roles are used without
// a name. Says the spec, "the user agent MUST treat such elements as if no
// role had been provided."
// https://w3c.github.io/aria/#document-handling_author-errors_roles
//
// 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 || aRole == roles::FORM) {
return NameIsEmpty() ? 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::GetMinimumRole(role aRole) const {
if (aRole != roles::TEXT && aRole != roles::TEXT_CONTAINER &&
aRole != roles::SECTION) {
// This isn't a generic role, so aRole is specific enough.
return aRole;
}
dom::Element* el = Elm();
if (el && el->IsHTMLElement() && el->HasAttr(nsGkAtoms::popover)) {
return roles::GROUPING;
}
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;
}
LocalAccessible* LocalAccessible::GetPopoverTargetDetailsRelation() const {
dom::Element* targetEl = mContent->GetEffectivePopoverTargetElement();
if (!targetEl) {
return nullptr;
}
LocalAccessible* targetAcc = mDoc->GetAccessible(targetEl);
if (!targetAcc) {
return nullptr;
}
// Even if the popovertarget is valid, there are a few cases where we must not
// expose it via the details relation.
if (const nsAttrValue* actionVal =
Elm()->GetParsedAttr(nsGkAtoms::popovertargetaction)) {
if (static_cast<PopoverTargetAction>(actionVal->GetEnumValue()) ==
PopoverTargetAction::Hide) {
return nullptr;
}
}
if (targetAcc->NextSibling() == this || targetAcc->PrevSibling() == this) {
return nullptr;
}
return targetAcc;
}
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: {
if (mContent->IsElement() &&
mContent->AsElement()->HasAttr(nsGkAtoms::aria_details)) {
return Relation(
new IDRefsIterator(mDoc, mContent, nsGkAtoms::aria_details));
}
if (LocalAccessible* target = GetPopoverTargetDetailsRelation()) {
return Relation(target);
}
return Relation();
}
case RelationType::DETAILS_FOR: {
Relation rel(
new RelatedAccIterator(mDoc, mContent, nsGkAtoms::aria_details));
RelatedAccIterator invokers(mDoc, mContent, nsGkAtoms::popovertarget);
while (Accessible* invoker = invokers.Next()) {
// We should only expose DETAILS_FOR if DETAILS was exposed on the
// invoker. However, DETAILS exposure on popover invokers is
// conditional.
LocalAccessible* popoverTarget =
invoker->AsLocal()->GetPopoverTargetDetailsRelation();
if (popoverTarget) {
MOZ_ASSERT(popoverTarget == this);
rel.AppendTarget(invoker);
}
}
return rel;
}
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(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(CacheKey::NameValueFlag, nameFlag);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::NameValueFlag, 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(CacheKey::HTMLPlaceholder, std::move(placeholder));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::HTMLPlaceholder, DeleteEntry());
}
}
if (!name.IsEmpty()) {
fields->SetAttribute(CacheKey::Name, std::move(name));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::Name, DeleteEntry());
}
nsString description;
Description(description);
if (!description.IsEmpty()) {
fields->SetAttribute(CacheKey::Description, std::move(description));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::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(CacheKey::NumericValue, CurValue());
fields->SetAttribute(CacheKey::MaxValue, MaxValue());
fields->SetAttribute(CacheKey::MinValue, MinValue());
fields->SetAttribute(CacheKey::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(CacheKey::TextValue, std::move(value));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::TextValue, DeleteEntry());
}
}
if (IsImage()) {
// Cache the src of images. This is used by some clients to help remediate
// inaccessible images.
MOZ_ASSERT(mContent, "Image must have mContent");
nsString src;
mContent->AsElement()->GetAttr(nsGkAtoms::src, src);
if (!src.IsEmpty()) {
fields->SetAttribute(CacheKey::SrcURL, std::move(src));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::SrcURL, 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 don't add the ::OnlyVisible option here, because
// it means we always consider frames with pointer-events: none.
// See usage of HitTestIsForVisibility in nsDisplayList::HitTest.
// 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(CacheKey::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(CacheKey::CrossDocOffset,
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(CacheKey::ParentRelativeBounds,
std::move(boundsArray));
}
if (frame && frame->ScrollableOverflowRect().IsEmpty()) {
fields->SetAttribute(CacheKey::IsClipped, true);
} else if (aUpdateType != CacheUpdateType::Initial) {
fields->SetAttribute(CacheKey::IsClipped, 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(CacheKey::Text, std::move(text));
TextLeafPoint point(this, 0);
RefPtr<AccAttributes> attrs = point.GetTextAttributesLocalAcc(
/* aIncludeDefaults */ false);
fields->SetAttribute(CacheKey::TextAttributes, std::move(attrs));
}
}
if (HyperTextAccessible* ht = AsHyperText()) {
RefPtr<AccAttributes> attrs = ht->DefaultTextAttributes();
fields->SetAttribute(CacheKey::TextAttributes, 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(CacheKey::SpellingErrors, std::move(spellingErrors));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::SpellingErrors, 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(CacheKey::TextLineStarts, std::move(lineStarts));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::TextLineStarts, 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) {
if (charRect.width == 0 &&
!currTextFrame->StyleText()->WhiteSpaceIsSignificant()) {
// GetCharacterRectsInRange gives us one rect per content
// offset. However, TextLeafAccessibles use rendered offsets;
// e.g. they might exclude some content white space. If we get
// a 0 width rect and it's white space, skip this rect, since
// this character isn't in the rendered text. We do have
// a way to convert between content and rendered offsets, but
// doing this for every character is expensive.
const char16_t contentChar = mContent->GetText()->CharAt(
charData.Length() / kNumbersInRect);
if (contentChar == u' ' || contentChar == u'\t' ||
contentChar == u'\n') {
continue;
}
}
// 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(CacheKey::TextBounds, 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(CacheKey::TransformMatrix, 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(CacheKey::TransformMatrix, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::ScrollPosition && frame) {
const auto [scrollPosition, scrollRange] = mDoc->ComputeScrollData(this);
if (scrollRange.width || scrollRange.height) {
// If the scroll range is 0 by 0, this acc is not scrollable. We
// can't simply check scrollPosition != 0, since it's valid for scrollable
// frames to have a (0, 0) position. We also can't check IsEmpty or
// ZeroArea because frames with only one scrollable dimension will return
// a height/width of zero for the non-scrollable dimension, yielding zero
// area even if the width/height for the scrollable dimension is nonzero.
// We also cache (0, 0) for accs with overflow:auto or overflow:scroll,
// even if the content is not currently large enough to be scrollable
// right now -- these accs have a non-zero scroll range.
nsTArray<int32_t> positionArr(2);
positionArr.AppendElement(scrollPosition.x);
positionArr.AppendElement(scrollPosition.y);
fields->SetAttribute(CacheKey::ScrollPosition, std::move(positionArr));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::ScrollPosition, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::DOMNodeIDAndClass && mContent) {
nsAtom* id = mContent->GetID();
if (id) {
fields->SetAttribute(CacheKey::DOMNodeID, id);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::DOMNodeID, DeleteEntry());
}
if (auto* el = dom::Element::FromNodeOrNull(mContent)) {
nsAutoString className;
el->GetClassName(className);
if (!className.IsEmpty()) {
fields->SetAttribute(CacheKey::DOMNodeClass, std::move(className));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::DOMNodeClass, 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(CacheKey::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(CacheKey::ARIASelected, *ariaSelected);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::ARIASelected, 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(CacheKey::PrimaryAction, actionAtom);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::PrimaryAction, DeleteEntry());
}
if (ImageAccessible* imgAcc = AsImage()) {
// Here we cache the showlongdesc action.
if (imgAcc->HasLongDesc()) {
fields->SetAttribute(CacheKey::HasLongdesc, true);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::HasLongdesc, DeleteEntry());
}
}
KeyBinding accessKey = AccessKey();
if (!accessKey.IsEmpty()) {
fields->SetAttribute(CacheKey::AccessKey, accessKey.Serialize());
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::AccessKey, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::Style) {
if (RefPtr<nsAtom> display = DisplayStyle()) {
fields->SetAttribute(CacheKey::CSSDisplay, display);
}
float opacity = Opacity();
if (opacity != 1.0f) {
fields->SetAttribute(CacheKey::Opacity, opacity);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::Opacity, DeleteEntry());
}
if (frame &&
frame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
nsLayoutUtils::IsReallyFixedPos(frame)) {
fields->SetAttribute(CacheKey::CssPosition, nsGkAtoms::fixed);
} else if (aUpdateType != CacheUpdateType::Initial) {
fields->SetAttribute(CacheKey::CssPosition, DeleteEntry());
}
if (frame) {
nsAutoCString overflow;
frame->Style()->GetComputedPropertyValue(eCSSProperty_overflow, overflow);
RefPtr<nsAtom> overflowAtom = NS_Atomize(overflow);
if (overflowAtom == nsGkAtoms::hidden) {
fields->SetAttribute(CacheKey::CSSOverflow, nsGkAtoms::hidden);
} else if (aUpdateType != CacheUpdateType::Initial) {
fields->SetAttribute(CacheKey::CSSOverflow, DeleteEntry());
}
}
}
if (aCacheDomain & CacheDomain::Table) {
if (auto* table = HTMLTableAccessible::GetFrom(this)) {
if (table->IsProbablyLayoutTable()) {
fields->SetAttribute(CacheKey::TableLayoutGuess, true);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::TableLayoutGuess, 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(CacheKey::RowSpan, value);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::RowSpan, DeleteEntry());
}
value = static_cast<int32_t>(cell->ColExtent());
MOZ_ASSERT(value > 0);
if (value > 1) {
fields->SetAttribute(CacheKey::ColSpan, value);
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::ColSpan, DeleteEntry());
}
if (mContent->AsElement()->HasAttr(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(CacheKey::CellHeaders, std::move(headers));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::CellHeaders, 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(CacheKey::ARIAAttributes, std::move(ariaAttrs));
} else if (aUpdateType == CacheUpdateType::Update) {
fields->SetAttribute(CacheKey::ARIAAttributes, 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(nsGkAtoms::name, name);
if (!name.IsEmpty()) {
fields->SetAttribute(CacheKey::DOMName, 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(CacheKey::DOMName, 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 if (data.mType == RelationType::DETAILS) {
// We need to use RelationByType for details because it might include
// popovertarget. Nothing exposes an implicit reverse details
// relation, so using RelationByType here is fine.
rel = RelationByType(RelationType::DETAILS);
} else {
// We use an IDRefsIterator here instead of calling RelationByType
// directly because we only want to cache explicit relations. Implicit
// relations (e.g. LABEL_FOR exposed on the target of aria-labelledby)
// 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(CacheKey::InnerHTML, 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(CacheKey::TagName, 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(CacheKey::InputType, 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(CacheKey::ARIARole, std::move(role));
}
}
if (auto* htmlEl = nsGenericHTMLElement::FromNode(mContent)) {
// Changing popover recreates the Accessible, so it's immutable in the
// cache.
nsAutoString popover;
htmlEl->GetPopover(popover);
if (!popover.IsEmpty()) {
fields->SetAttribute(CacheKey::PopupType,
RefPtr{NS_Atomize(popover)});
}
}
}
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(CacheKey::Resolution, resolution);
int32_t appUnitsPerDevPixel =
presShell->GetPresContext()->AppUnitsPerDevPixel();
fields->SetAttribute(CacheKey::AppUnitsPerDevPixel,
appUnitsPerDevPixel);
}
nsString mimeType;
AsDoc()->MimeType(mimeType);
fields->SetAttribute(CacheKey::MimeType, 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) {
if (oldOverflow.Equals("hidden"_ns) || newOverflow.Equals("hidden"_ns)) {
mDoc->QueueCacheUpdate(this, CacheDomain::Style);
}
if (oldOverflow.Equals("auto"_ns) || newOverflow.Equals("auto"_ns) ||
oldOverflow.Equals("scroll"_ns) || newOverflow.Equals("scroll"_ns)) {
// We cache a (0,0) scroll position for frames that have overflow
// styling which means they _could_ become scrollable, even if the
// content within them doesn't currently scroll.
mDoc->QueueCacheUpdate(this, CacheDomain::ScrollPosition);
}
}
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;
}
static const dom::Element::AttrValuesArray presentationRoles[] = {
nsGkAtoms::none, nsGkAtoms::presentation, nullptr};
if (nsAccUtils::FindARIAAttrValueIn(elm, nsGkAtoms::role, presentationRoles,
eIgnoreCase) != AttrArray::ATTR_MISSING &&
IsGeneric()) {
// This Accessible has been marked presentational, but we forced a generic
// Accessible for some reason; e.g. CSS transform. Don't expose display in
// this case, as the author might be explicitly trying to avoid said
// exposure.
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();
}
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