gecko-dev/accessible/html/HTMLTableAccessible.cpp
Amit Prakash Ambasta 1a34bf9361 Bug 1889054 - Fix issues with non-unified builds missing header inclusions. r=emilio
Signed-off-by: Amit Prakash Ambasta <amit.prakash.ambasta@gmail.com>

Differential Revision: https://phabricator.services.mozilla.com/D207004
2024-04-09 12:09:53 +00:00

714 lines
25 KiB
C++

/* -*- 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 "HTMLTableAccessible.h"
#include <stdint.h>
#include "nsAccessibilityService.h"
#include "AccAttributes.h"
#include "ARIAMap.h"
#include "CacheConstants.h"
#include "LocalAccessible-inl.h"
#include "DocAccessible-inl.h"
#include "nsTextEquivUtils.h"
#include "Relation.h"
#include "mozilla/a11y/Role.h"
#include "States.h"
#include "mozilla/a11y/TableAccessible.h"
#include "mozilla/a11y/TableCellAccessible.h"
#include "mozilla/Assertions.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/NameSpaceConstants.h"
#include "nsCaseTreatment.h"
#include "nsColor.h"
#include "nsCOMPtr.h"
#include "nsCoreUtils.h"
#include "nsDebug.h"
#include "nsIHTMLCollection.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsLiteralString.h"
#include "nsMargin.h"
#include "nsQueryFrame.h"
#include "nsSize.h"
#include "nsStringFwd.h"
#include "nsTableCellFrame.h"
#include "nsTableWrapperFrame.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// HTMLTableCellAccessible
////////////////////////////////////////////////////////////////////////////////
HTMLTableCellAccessible::HTMLTableCellAccessible(nsIContent* aContent,
DocAccessible* aDoc)
: HyperTextAccessible(aContent, aDoc) {
mType = eHTMLTableCellType;
mGenericTypes |= eTableCell;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableCellAccessible: LocalAccessible implementation
role HTMLTableCellAccessible::NativeRole() const {
// We implement this rather than using the markup maps because we only want
// this role to be returned if this is a valid cell. An invalid cell (e.g. if
// the table has role="none") won't use this class, so it will get a generic
// role, since the markup map doesn't specify a role.
if (mContent->IsMathMLElement(nsGkAtoms::mtd_)) {
return roles::MATHML_CELL;
}
return roles::CELL;
}
uint64_t HTMLTableCellAccessible::NativeState() const {
uint64_t state = HyperTextAccessible::NativeState();
nsIFrame* frame = mContent->GetPrimaryFrame();
NS_ASSERTION(frame, "No frame for valid cell accessible!");
if (frame && frame->IsSelected()) {
state |= states::SELECTED;
}
return state;
}
uint64_t HTMLTableCellAccessible::NativeInteractiveState() const {
return HyperTextAccessible::NativeInteractiveState() | states::SELECTABLE;
}
already_AddRefed<AccAttributes> HTMLTableCellAccessible::NativeAttributes() {
RefPtr<AccAttributes> attributes = HyperTextAccessible::NativeAttributes();
// We only need to expose table-cell-index to clients. If we're in the content
// process, we don't need this, so building a CachedTableAccessible is very
// wasteful. This will be exposed by RemoteAccessible in the parent process
// instead.
if (!IPCAccessibilityActive()) {
if (const TableCellAccessible* cell = AsTableCell()) {
TableAccessible* table = cell->Table();
const uint32_t row = cell->RowIdx();
const uint32_t col = cell->ColIdx();
const int32_t cellIdx = table->CellIndexAt(row, col);
if (cellIdx != -1) {
attributes->SetAttribute(nsGkAtoms::tableCellIndex, cellIdx);
}
}
}
// abbr attribute
// Pick up object attribute from abbr DOM element (a child of the cell) or
// from abbr DOM attribute.
nsString abbrText;
if (ChildCount() == 1) {
LocalAccessible* abbr = LocalFirstChild();
if (abbr->IsAbbreviation()) {
nsIContent* firstChildNode = abbr->GetContent()->GetFirstChild();
if (firstChildNode) {
nsTextEquivUtils::AppendTextEquivFromTextContent(firstChildNode,
&abbrText);
}
}
}
if (abbrText.IsEmpty()) {
mContent->AsElement()->GetAttr(nsGkAtoms::abbr, abbrText);
}
if (!abbrText.IsEmpty()) {
attributes->SetAttribute(nsGkAtoms::abbr, std::move(abbrText));
}
// axis attribute
nsString axisText;
mContent->AsElement()->GetAttr(nsGkAtoms::axis, axisText);
if (!axisText.IsEmpty()) {
attributes->SetAttribute(nsGkAtoms::axis, std::move(axisText));
}
return attributes.forget();
}
void HTMLTableCellAccessible::DOMAttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue,
uint64_t aOldState) {
HyperTextAccessible::DOMAttributeChanged(aNameSpaceID, aAttribute, aModType,
aOldValue, aOldState);
if (aAttribute == nsGkAtoms::headers || aAttribute == nsGkAtoms::abbr ||
aAttribute == nsGkAtoms::scope) {
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_OBJECT_ATTRIBUTE_CHANGED,
this);
if (HTMLTableAccessible* table = Table()) {
// Modifying these attributes can also modify our table's classification
// as either a layout or data table. Queue an update on the table itself
// to re-compute our "layout guess"
mDoc->QueueCacheUpdate(table, CacheDomain::Table);
}
mDoc->QueueCacheUpdate(this, CacheDomain::Table);
} else if (aAttribute == nsGkAtoms::rowspan ||
aAttribute == nsGkAtoms::colspan) {
if (HTMLTableAccessible* table = Table()) {
// Modifying these attributes can also modify our table's classification
// as either a layout or data table. Queue an update on the table itself
// to re-compute our "layout guess"
mDoc->QueueCacheUpdate(table, CacheDomain::Table);
}
mDoc->QueueCacheUpdate(this, CacheDomain::Table);
}
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableCellAccessible implementation
HTMLTableAccessible* HTMLTableCellAccessible::Table() const {
LocalAccessible* parent = const_cast<HTMLTableCellAccessible*>(this);
while ((parent = parent->LocalParent())) {
if (parent->IsHTMLTable()) {
return HTMLTableAccessible::GetFrom(parent);
}
}
return nullptr;
}
uint32_t HTMLTableCellAccessible::ColExtent() const {
nsTableCellFrame* cell = do_QueryFrame(GetFrame());
if (!cell) {
// This probably isn't a table according to the layout engine; e.g. it has
// display: block.
return 1;
}
nsTableFrame* table = cell->GetTableFrame();
MOZ_ASSERT(table);
return table->GetEffectiveColSpan(*cell);
}
uint32_t HTMLTableCellAccessible::RowExtent() const {
nsTableCellFrame* cell = do_QueryFrame(GetFrame());
if (!cell) {
// This probably isn't a table according to the layout engine; e.g. it has
// display: block.
return 1;
}
nsTableFrame* table = cell->GetTableFrame();
MOZ_ASSERT(table);
return table->GetEffectiveRowSpan(*cell);
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableHeaderCellAccessible
////////////////////////////////////////////////////////////////////////////////
HTMLTableHeaderCellAccessible::HTMLTableHeaderCellAccessible(
nsIContent* aContent, DocAccessible* aDoc)
: HTMLTableCellAccessible(aContent, aDoc) {}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableHeaderCellAccessible: LocalAccessible implementation
role HTMLTableHeaderCellAccessible::NativeRole() const {
dom::Element* el = Elm();
if (!el) {
return roles::NOTHING;
}
// Check value of @scope attribute.
static mozilla::dom::Element::AttrValuesArray scopeValues[] = {
nsGkAtoms::col, nsGkAtoms::colgroup, nsGkAtoms::row, nsGkAtoms::rowgroup,
nullptr};
int32_t valueIdx = el->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::scope,
scopeValues, eCaseMatters);
switch (valueIdx) {
case 0:
case 1:
return roles::COLUMNHEADER;
case 2:
case 3:
return roles::ROWHEADER;
}
dom::Element* nextEl = el->GetNextElementSibling();
dom::Element* prevEl = el->GetPreviousElementSibling();
// If this is the only cell in its row, it's a column header.
if (!nextEl && !prevEl) {
return roles::COLUMNHEADER;
}
const bool nextIsHeader = nextEl && nsCoreUtils::IsHTMLTableHeader(nextEl);
const bool prevIsHeader = prevEl && nsCoreUtils::IsHTMLTableHeader(prevEl);
// If this has a header on both sides, it is a column header.
if (prevIsHeader && nextIsHeader) {
return roles::COLUMNHEADER;
}
// If this has a header on one side and only a single normal cell on the
// other, it's a column header.
if (nextIsHeader && prevEl && !prevEl->GetPreviousElementSibling()) {
return roles::COLUMNHEADER;
}
if (prevIsHeader && nextEl && !nextEl->GetNextElementSibling()) {
return roles::COLUMNHEADER;
}
// If this has a normal cell next to it, it 's a row header.
if ((nextEl && !nextIsHeader) || (prevEl && !prevIsHeader)) {
return roles::ROWHEADER;
}
// If this has a row span, it could be a row header.
if (RowExtent() > 1) {
// It isn't a row header if it has 1 or more consecutive headers next to it.
if (prevIsHeader &&
(!prevEl->GetPreviousElementSibling() ||
nsCoreUtils::IsHTMLTableHeader(prevEl->GetPreviousElementSibling()))) {
return roles::COLUMNHEADER;
}
if (nextIsHeader &&
(!nextEl->GetNextElementSibling() ||
nsCoreUtils::IsHTMLTableHeader(nextEl->GetNextElementSibling()))) {
return roles::COLUMNHEADER;
}
return roles::ROWHEADER;
}
// Otherwise, assume it's a column header.
return roles::COLUMNHEADER;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableRowAccessible
////////////////////////////////////////////////////////////////////////////////
// LocalAccessible protected
ENameValueFlag HTMLTableRowAccessible::NativeName(nsString& aName) const {
// For table row accessibles, we only want to calculate the name from the
// sub tree if an ARIA role is present.
if (HasStrongARIARole()) {
return AccessibleWrap::NativeName(aName);
}
return eNameOK;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible: LocalAccessible
bool HTMLTableAccessible::InsertChildAt(uint32_t aIndex,
LocalAccessible* aChild) {
// Move caption accessible so that it's the first child. Check for the first
// caption only, because nsAccessibilityService ensures we don't create
// accessibles for the other captions, since only the first is actually
// visible.
return HyperTextAccessible::InsertChildAt(
aChild->IsHTMLCaption() ? 0 : aIndex, aChild);
}
uint64_t HTMLTableAccessible::NativeState() const {
return LocalAccessible::NativeState() | states::READONLY;
}
ENameValueFlag HTMLTableAccessible::NativeName(nsString& aName) const {
ENameValueFlag nameFlag = LocalAccessible::NativeName(aName);
if (!aName.IsEmpty()) {
return nameFlag;
}
// Use table caption as a name.
LocalAccessible* caption = Caption();
if (caption) {
nsIContent* captionContent = caption->GetContent();
if (captionContent) {
nsTextEquivUtils::AppendTextEquivFromContent(this, captionContent,
&aName);
if (!aName.IsEmpty()) {
return eNameOK;
}
}
}
// If no caption then use summary as a name.
mContent->AsElement()->GetAttr(nsGkAtoms::summary, aName);
return eNameOK;
}
void HTMLTableAccessible::DOMAttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue,
uint64_t aOldState) {
HyperTextAccessible::DOMAttributeChanged(aNameSpaceID, aAttribute, aModType,
aOldValue, aOldState);
if (aAttribute == nsGkAtoms::summary) {
nsAutoString name;
ARIAName(name);
if (name.IsEmpty()) {
if (!Caption()) {
// XXX: Should really be checking if caption provides a name.
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
}
}
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_OBJECT_ATTRIBUTE_CHANGED,
this);
mDoc->QueueCacheUpdate(this, CacheDomain::Table);
}
}
already_AddRefed<AccAttributes> HTMLTableAccessible::NativeAttributes() {
RefPtr<AccAttributes> attributes = AccessibleWrap::NativeAttributes();
if (mContent->IsMathMLElement(nsGkAtoms::mtable_)) {
GetAccService()->MarkupAttributes(this, attributes);
}
if (IsProbablyLayoutTable()) {
attributes->SetAttribute(nsGkAtoms::layout_guess, true);
}
return attributes.forget();
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible: LocalAccessible
Relation HTMLTableAccessible::RelationByType(RelationType aType) const {
Relation rel = AccessibleWrap::RelationByType(aType);
if (aType == RelationType::LABELLED_BY) {
rel.AppendTarget(Caption());
}
return rel;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible: Table
LocalAccessible* HTMLTableAccessible::Caption() const {
LocalAccessible* child = mChildren.SafeElementAt(0, nullptr);
// Since this is an HTML table the caption needs to be a caption
// element with no ARIA role (except for a reduntant role='caption').
// If we did a full Role() calculation here we risk getting into an infinite
// loop where the parent role would depend on its name which would need to be
// calculated by retrieving the caption (bug 1420773.)
return child && child->NativeRole() == roles::CAPTION &&
(!child->HasStrongARIARole() ||
child->IsARIARole(nsGkAtoms::caption))
? child
: nullptr;
}
uint32_t HTMLTableAccessible::ColCount() const {
nsTableWrapperFrame* tableFrame = GetTableWrapperFrame();
return tableFrame ? tableFrame->GetColCount() : 0;
}
uint32_t HTMLTableAccessible::RowCount() {
nsTableWrapperFrame* tableFrame = GetTableWrapperFrame();
return tableFrame ? tableFrame->GetRowCount() : 0;
}
bool HTMLTableAccessible::IsProbablyLayoutTable() {
// Implement a heuristic to determine if table is most likely used for layout.
// XXX do we want to look for rowspan or colspan, especialy that span all but
// a couple cells at the beginning or end of a row/col, and especially when
// they occur at the edge of a table?
// XXX For now debugging descriptions are always on via SHOW_LAYOUT_HEURISTIC
// This will allow release trunk builds to be used by testers to refine
// the algorithm. Integrate it into Logging.
// Change to |#define SHOW_LAYOUT_HEURISTIC DEBUG| before final release
#ifdef SHOW_LAYOUT_HEURISTIC
# define RETURN_LAYOUT_ANSWER(isLayout, heuristic) \
{ \
mLayoutHeuristic = isLayout \
? nsLiteralString(u"layout table: " heuristic) \
: nsLiteralString(u"data table: " heuristic); \
return isLayout; \
}
#else
# define RETURN_LAYOUT_ANSWER(isLayout, heuristic) \
{ return isLayout; }
#endif
MOZ_ASSERT(!IsDefunct(), "Table accessible should not be defunct");
// Need to see all elements while document is being edited.
if (Document()->State() & states::EDITABLE) {
RETURN_LAYOUT_ANSWER(false, "In editable document");
}
// Check to see if an ARIA role overrides the role from native markup,
// but for which we still expose table semantics (treegrid, for example).
if (HasARIARole()) {
RETURN_LAYOUT_ANSWER(false, "Has role attribute");
}
dom::Element* el = Elm();
if (el->IsMathMLElement(nsGkAtoms::mtable_)) {
RETURN_LAYOUT_ANSWER(false, "MathML matrix");
}
MOZ_ASSERT(el->IsHTMLElement(nsGkAtoms::table),
"Table should not be built by CSS display:table style");
// Check if datatable attribute has "0" value.
if (el->AttrValueIs(kNameSpaceID_None, nsGkAtoms::datatable, u"0"_ns,
eCaseMatters)) {
RETURN_LAYOUT_ANSWER(true, "Has datatable = 0 attribute, it's for layout");
}
// Check for legitimate data table attributes.
if (el->Element::HasNonEmptyAttr(nsGkAtoms::summary)) {
RETURN_LAYOUT_ANSWER(false, "Has summary -- legitimate table structures");
}
// Check for legitimate data table elements.
LocalAccessible* caption = LocalFirstChild();
if (caption && caption->IsHTMLCaption() && caption->HasChildren()) {
RETURN_LAYOUT_ANSWER(false,
"Not empty caption -- legitimate table structures");
}
for (nsIContent* childElm = el->GetFirstChild(); childElm;
childElm = childElm->GetNextSibling()) {
if (!childElm->IsHTMLElement()) continue;
if (childElm->IsAnyOfHTMLElements(nsGkAtoms::col, nsGkAtoms::colgroup,
nsGkAtoms::tfoot, nsGkAtoms::thead)) {
RETURN_LAYOUT_ANSWER(
false,
"Has col, colgroup, tfoot or thead -- legitimate table structures");
}
if (childElm->IsHTMLElement(nsGkAtoms::tbody)) {
for (nsIContent* rowElm = childElm->GetFirstChild(); rowElm;
rowElm = rowElm->GetNextSibling()) {
if (rowElm->IsHTMLElement(nsGkAtoms::tr)) {
if (LocalAccessible* row = Document()->GetAccessible(rowElm)) {
if (const nsRoleMapEntry* roleMapEntry = row->ARIARoleMap()) {
if (roleMapEntry->role != roles::ROW) {
RETURN_LAYOUT_ANSWER(true, "Repurposed tr with different role");
}
}
}
for (nsIContent* cellElm = rowElm->GetFirstChild(); cellElm;
cellElm = cellElm->GetNextSibling()) {
if (cellElm->IsHTMLElement()) {
if (cellElm->NodeInfo()->Equals(nsGkAtoms::th)) {
RETURN_LAYOUT_ANSWER(false,
"Has th -- legitimate table structures");
}
if (cellElm->AsElement()->HasAttr(nsGkAtoms::headers) ||
cellElm->AsElement()->HasAttr(nsGkAtoms::scope) ||
cellElm->AsElement()->HasAttr(nsGkAtoms::abbr)) {
RETURN_LAYOUT_ANSWER(false,
"Has headers, scope, or abbr attribute -- "
"legitimate table structures");
}
if (LocalAccessible* cell = Document()->GetAccessible(cellElm)) {
if (const nsRoleMapEntry* roleMapEntry = cell->ARIARoleMap()) {
if (roleMapEntry->role != roles::CELL &&
roleMapEntry->role != roles::COLUMNHEADER &&
roleMapEntry->role != roles::ROWHEADER &&
roleMapEntry->role != roles::GRID_CELL) {
RETURN_LAYOUT_ANSWER(true,
"Repurposed cell with different role");
}
}
if (cell->ChildCount() == 1 &&
cell->LocalFirstChild()->IsAbbreviation()) {
RETURN_LAYOUT_ANSWER(
false, "has abbr -- legitimate table structures");
}
}
}
}
}
}
}
}
// If only 1 column or only 1 row, it's for layout.
auto colCount = ColCount();
if (colCount <= 1) {
RETURN_LAYOUT_ANSWER(true, "Has only 1 column");
}
auto rowCount = RowCount();
if (rowCount <= 1) {
RETURN_LAYOUT_ANSWER(true, "Has only 1 row");
}
// Check for many columns.
if (colCount >= 5) {
RETURN_LAYOUT_ANSWER(false, ">=5 columns");
}
// Now we know there are 2-4 columns and 2 or more rows. Check to see if
// there are visible borders on the cells.
// XXX currently, we just check the first cell -- do we really need to do
// more?
nsTableWrapperFrame* tableFrame = do_QueryFrame(el->GetPrimaryFrame());
if (!tableFrame) {
RETURN_LAYOUT_ANSWER(false, "table with no frame!");
}
nsIFrame* cellFrame = tableFrame->GetCellFrameAt(0, 0);
if (!cellFrame) {
RETURN_LAYOUT_ANSWER(false, "table's first cell has no frame!");
}
nsMargin border = cellFrame->StyleBorder()->GetComputedBorder();
if (border.top || border.bottom || border.left || border.right) {
RETURN_LAYOUT_ANSWER(false, "Has nonzero border-width on table cell");
}
// Check for nested tables.
nsCOMPtr<nsIHTMLCollection> nestedTables =
el->GetElementsByTagName(u"table"_ns);
if (nestedTables->Length() > 0) {
RETURN_LAYOUT_ANSWER(true, "Has a nested table within it");
}
// Rules for non-bordered tables with 2-4 columns and 2+ rows from here on
// forward.
// Check for styled background color across rows (alternating background
// color is a common feature for data tables).
auto childCount = ChildCount();
nscolor rowColor = 0;
nscolor prevRowColor;
for (auto childIdx = 0U; childIdx < childCount; childIdx++) {
LocalAccessible* child = LocalChildAt(childIdx);
if (child->IsHTMLTableRow()) {
prevRowColor = rowColor;
nsIFrame* rowFrame = child->GetFrame();
MOZ_ASSERT(rowFrame, "Table hierarchy got screwed up");
if (!rowFrame) {
RETURN_LAYOUT_ANSWER(false, "Unexpected table hierarchy");
}
rowColor = rowFrame->StyleBackground()->BackgroundColor(rowFrame);
if (childIdx > 0 && prevRowColor != rowColor) {
RETURN_LAYOUT_ANSWER(false,
"2 styles of row background color, non-bordered");
}
}
}
// Check for many rows.
const uint32_t kMaxLayoutRows = 20;
if (rowCount > kMaxLayoutRows) { // A ton of rows, this is probably for data
RETURN_LAYOUT_ANSWER(false, ">= kMaxLayoutRows (20) and non-bordered");
}
// Check for very wide table.
nsIFrame* documentFrame = Document()->GetFrame();
nsSize documentSize = documentFrame->GetSize();
if (documentSize.width > 0) {
nsSize tableSize = GetFrame()->GetSize();
int32_t percentageOfDocWidth = (100 * tableSize.width) / documentSize.width;
if (percentageOfDocWidth > 95) {
// 3-4 columns, no borders, not a lot of rows, and 95% of the doc's width
// Probably for layout
RETURN_LAYOUT_ANSWER(
true, "<= 4 columns, table width is 95% of document width");
}
}
// Two column rules.
if (rowCount * colCount <= 10) {
RETURN_LAYOUT_ANSWER(true, "2-4 columns, 10 cells or less, non-bordered");
}
static const nsLiteralString tags[] = {u"embed"_ns, u"object"_ns,
u"iframe"_ns};
for (const auto& tag : tags) {
nsCOMPtr<nsIHTMLCollection> descendants = el->GetElementsByTagName(tag);
if (descendants->Length() > 0) {
RETURN_LAYOUT_ANSWER(true,
"Has no borders, and has iframe, object or embed, "
"typical of advertisements");
}
}
RETURN_LAYOUT_ANSWER(false,
"No layout factor strong enough, so will guess data");
}
////////////////////////////////////////////////////////////////////////////////
// HTMLTableAccessible: protected implementation
void HTMLTableAccessible::Description(nsString& aDescription) const {
// Helpful for debugging layout vs. data tables
aDescription.Truncate();
LocalAccessible::Description(aDescription);
if (!aDescription.IsEmpty()) {
return;
}
// Use summary as description if it weren't used as a name.
// XXX: get rid code duplication with NameInternal().
LocalAccessible* caption = Caption();
if (caption) {
nsIContent* captionContent = caption->GetContent();
if (captionContent) {
nsAutoString captionText;
nsTextEquivUtils::AppendTextEquivFromContent(this, captionContent,
&captionText);
if (!captionText.IsEmpty()) { // summary isn't used as a name.
mContent->AsElement()->GetAttr(nsGkAtoms::summary, aDescription);
}
}
}
#ifdef SHOW_LAYOUT_HEURISTIC
if (aDescription.IsEmpty()) {
bool isProbablyForLayout = IsProbablyLayoutTable();
aDescription = mLayoutHeuristic;
}
printf("\nTABLE: %s\n", NS_ConvertUTF16toUTF8(mLayoutHeuristic).get());
#endif
}
nsTableWrapperFrame* HTMLTableAccessible::GetTableWrapperFrame() const {
nsTableWrapperFrame* tableFrame = do_QueryFrame(mContent->GetPrimaryFrame());
if (tableFrame && tableFrame->PrincipalChildList().FirstChild()) {
return tableFrame;
}
return nullptr;
}
////////////////////////////////////////////////////////////////////////////////
// HTMLCaptionAccessible
////////////////////////////////////////////////////////////////////////////////
Relation HTMLCaptionAccessible::RelationByType(RelationType aType) const {
Relation rel = HyperTextAccessible::RelationByType(aType);
if (aType == RelationType::LABEL_FOR) {
rel.AppendTarget(LocalParent());
}
return rel;
}
role HTMLCaptionAccessible::NativeRole() const { return roles::CAPTION; }