nsresult
ARIAGridCellAccessible::GetAttributesInternal(nsIPersistentProperties* aAttributes)
{
if (IsDefunct())
return NS_ERROR_FAILURE;
nsresult rv = HyperTextAccessibleWrap::GetAttributesInternal(aAttributes);
NS_ENSURE_SUCCESS(rv, rv);
// Expose "table-cell-index" attribute.
Accessible* thisRow = Parent();
if (!thisRow || thisRow->Role() != roles::ROW)
return NS_OK;
int32_t colIdx = 0, colCount = 0;
uint32_t childCount = thisRow->ChildCount();
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = thisRow->GetChildAt(childIdx);
if (child == this)
colIdx = colCount;
roles::Role role = child->Role();
if (role == roles::GRID_CELL || role == roles::ROWHEADER ||
role == roles::COLUMNHEADER)
colCount++;
}
Accessible* table = thisRow->Parent();
if (!table)
return NS_OK;
roles::Role tableRole = table->Role();
if (tableRole != roles::TABLE && tableRole != roles::TREE_TABLE)
return NS_OK;
int32_t rowIdx = 0;
childCount = table->ChildCount();
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = table->GetChildAt(childIdx);
if (child == thisRow)
break;
if (child->Role() == roles::ROW)
rowIdx++;
}
int32_t idx = rowIdx * colCount + colIdx;
nsAutoString stringIdx;
stringIdx.AppendInt(idx);
nsAccUtils::SetAccAttr(aAttributes, nsGkAtoms::tableCellIndex,
stringIdx);
return NS_OK;
}
void
XULListCellAccessible::ColHeaderCells(nsTArray<Accessible*>* aCells)
{
TableAccessible* table = Table();
NS_ASSERTION(table, "cell not in a table!");
if (!table)
return;
// Get column header cell from XUL listhead.
Accessible* list = nullptr;
Accessible* tableAcc = table->AsAccessible();
uint32_t tableChildCount = tableAcc->ChildCount();
for (uint32_t childIdx = 0; childIdx < tableChildCount; childIdx++) {
Accessible* child = tableAcc->GetChildAt(childIdx);
if (child->Role() == roles::LIST) {
list = child;
break;
}
}
if (list) {
Accessible* headerCell = list->GetChildAt(ColIdx());
if (headerCell) {
aCells->AppendElement(headerCell);
return;
}
}
// No column header cell from XUL markup, try to get it from ARIA markup.
TableCellAccessible::ColHeaderCells(aCells);
}
void
XULListboxAccessible::SelectedCells(nsTArray<Accessible*>* aCells)
{
nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
do_QueryInterface(mContent);
NS_ASSERTION(control,
"Doesn't implement nsIDOMXULMultiSelectControlElement.");
nsCOMPtr<nsIDOMNodeList> selectedItems;
control->GetSelectedItems(getter_AddRefs(selectedItems));
if (!selectedItems)
return;
uint32_t selectedItemsCount = 0;
DebugOnly<nsresult> rv = selectedItems->GetLength(&selectedItemsCount);
NS_ASSERTION(NS_SUCCEEDED(rv), "GetLength() Shouldn't fail!");
for (uint32_t index = 0; index < selectedItemsCount; index++) {
nsCOMPtr<nsIDOMNode> itemNode;
selectedItems->Item(index, getter_AddRefs(itemNode));
nsCOMPtr<nsIContent> itemContent(do_QueryInterface(itemNode));
Accessible* item = mDoc->GetAccessible(itemContent);
if (item) {
uint32_t cellCount = item->ChildCount();
for (uint32_t cellIdx = 0; cellIdx < cellCount; cellIdx++) {
Accessible* cell = mChildren[cellIdx];
if (cell->Role() == roles::CELL)
aCells->AppendElement(cell);
}
}
}
}
Accessible*
AccGroupInfo::NextItemTo(Accessible* aItem)
{
AccGroupInfo* groupInfo = aItem->GetGroupInfo();
if (!groupInfo)
return nullptr;
// If the item in middle of the group then search next item in siblings.
if (groupInfo->PosInSet() >= groupInfo->SetSize())
return nullptr;
Accessible* parent = aItem->Parent();
uint32_t childCount = parent->ChildCount();
for (uint32_t idx = aItem->IndexInParent() + 1; idx < childCount; idx++) {
Accessible* nextItem = parent->GetChildAt(idx);
AccGroupInfo* nextGroupInfo = nextItem->GetGroupInfo();
if (nextGroupInfo &&
nextGroupInfo->ConceptualParent() == groupInfo->ConceptualParent()) {
return nextItem;
}
}
NS_NOTREACHED("Item in the middle of the group but there's no next item!");
return nullptr;
}
void
XULToolbarButtonAccessible::GetPositionAndSizeInternal(int32_t* aPosInSet,
int32_t* aSetSize)
{
int32_t setSize = 0;
int32_t posInSet = 0;
Accessible* parent = Parent();
if (!parent)
return;
uint32_t childCount = parent->ChildCount();
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = parent->GetChildAt(childIdx);
if (IsSeparator(child)) { // end of a group of buttons
if (posInSet)
break; // we've found our group, so we're done
setSize = 0; // not our group, so start a new group
} else {
setSize++; // another button in the group
if (child == this)
posInSet = setSize; // we've found our button
}
}
*aPosInSet = posInSet;
*aSetSize = setSize;
}
nsIContent*
nsXFormsSelectableAccessible::GetItemByIndex(PRUint32* aIndex,
Accessible* aAccessible)
{
Accessible* accessible = aAccessible ? aAccessible : this;
PRUint32 childCount = accessible->ChildCount();
for (PRUint32 childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = accessible->GetChildAt(childIdx);
nsIContent* childContent = child->GetContent();
nsINodeInfo *nodeInfo = childContent->NodeInfo();
if (nodeInfo->NamespaceEquals(NS_LITERAL_STRING(NS_NAMESPACE_XFORMS))) {
if (nodeInfo->Equals(nsGkAtoms::item)) {
if (!*aIndex)
return childContent;
--*aIndex;
} else if (nodeInfo->Equals(nsGkAtoms::choices)) {
nsIContent* itemContent = GetItemByIndex(aIndex, child);
if (itemContent)
return itemContent;
}
}
}
return nsnull;
}
void
TextRange::EmbeddedChildren(nsTArray<Accessible*>* aChildren) const
{
if (mStartContainer == mEndContainer) {
int32_t startIdx = mStartContainer->GetChildIndexAtOffset(mStartOffset);
int32_t endIdx = mStartContainer->GetChildIndexAtOffset(mEndOffset);
for (int32_t idx = startIdx; idx <= endIdx; idx++) {
Accessible* child = mStartContainer->GetChildAt(idx);
if (nsAccUtils::IsEmbeddedObject(child))
aChildren->AppendElement(child);
}
return;
}
Accessible* p1 = mStartContainer->GetChildAtOffset(mStartOffset);
Accessible* p2 = mEndContainer->GetChildAtOffset(mEndOffset);
uint32_t pos1 = 0, pos2 = 0;
AutoTArray<Accessible*, 30> parents1, parents2;
Accessible* container =
CommonParent(p1, p2, &parents1, &pos1, &parents2, &pos2);
// Traverse the tree up to the container and collect embedded objects.
for (uint32_t idx = 0; idx < pos1 - 1; idx++) {
Accessible* parent = parents1[idx + 1];
Accessible* child = parents1[idx];
uint32_t childCount = parent->ChildCount();
for (uint32_t childIdx = child->IndexInParent(); childIdx < childCount; childIdx++) {
Accessible* next = parent->GetChildAt(childIdx);
if (nsAccUtils::IsEmbeddedObject(next))
aChildren->AppendElement(next);
}
}
// Traverse through direct children in the container.
int32_t endIdx = parents2[pos2 - 1]->IndexInParent();
int32_t childIdx = parents1[pos1 - 1]->IndexInParent() + 1;
for (; childIdx < endIdx; childIdx++) {
Accessible* next = container->GetChildAt(childIdx);
if (nsAccUtils::IsEmbeddedObject(next))
aChildren->AppendElement(next);
}
// Traverse down from the container to end point.
for (int32_t idx = pos2 - 2; idx > 0; idx--) {
Accessible* parent = parents2[idx];
Accessible* child = parents2[idx - 1];
int32_t endIdx = child->IndexInParent();
for (int32_t childIdx = 0; childIdx < endIdx; childIdx++) {
Accessible* next = parent->GetChildAt(childIdx);
if (nsAccUtils::IsEmbeddedObject(next))
aChildren->AppendElement(next);
}
}
}
NS_IMETHODIMP
nsXULListboxAccessible::GetSelectedCells(nsIArray **aCells)
{
NS_ENSURE_ARG_POINTER(aCells);
*aCells = nsnull;
if (IsDefunct())
return NS_ERROR_FAILURE;
nsresult rv = NS_OK;
nsCOMPtr<nsIMutableArray> selCells =
do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMXULMultiSelectControlElement> control =
do_QueryInterface(mContent);
NS_ASSERTION(control,
"Doesn't implement nsIDOMXULMultiSelectControlElement.");
nsCOMPtr<nsIDOMNodeList> selectedItems;
control->GetSelectedItems(getter_AddRefs(selectedItems));
if (!selectedItems)
return NS_OK;
PRUint32 selectedItemsCount = 0;
rv = selectedItems->GetLength(&selectedItemsCount);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(mDoc, NS_ERROR_FAILURE);
PRUint32 index = 0;
for (; index < selectedItemsCount; index++) {
nsCOMPtr<nsIDOMNode> itemNode;
selectedItems->Item(index, getter_AddRefs(itemNode));
nsCOMPtr<nsIContent> itemContent(do_QueryInterface(itemNode));
Accessible* item = mDoc->GetAccessible(itemContent);
if (item) {
PRUint32 cellCount = item->ChildCount();
for (PRUint32 cellIdx = 0; cellIdx < cellCount; cellIdx++) {
Accessible* cell = mChildren[cellIdx];
if (cell->Role() == roles::CELL)
selCells->AppendElement(static_cast<nsIAccessible*>(cell), false);
}
}
}
NS_ADDREF(*aCells = selCells);
return NS_OK;
}
already_AddRefed<nsIPersistentProperties>
ARIAGridCellAccessible::NativeAttributes()
{
nsCOMPtr<nsIPersistentProperties> attributes =
HyperTextAccessibleWrap::NativeAttributes();
// Expose "table-cell-index" attribute.
Accessible* thisRow = Row();
if (!thisRow)
return attributes.forget();
int32_t colIdx = 0, colCount = 0;
uint32_t childCount = thisRow->ChildCount();
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = thisRow->GetChildAt(childIdx);
if (child == this)
colIdx = colCount;
roles::Role role = child->Role();
if (role == roles::CELL || role == roles::GRID_CELL ||
role == roles::ROWHEADER || role == roles::COLUMNHEADER)
colCount++;
}
int32_t rowIdx = RowIndexFor(thisRow);
nsAutoString stringIdx;
stringIdx.AppendInt(rowIdx * colCount + colIdx);
nsAccUtils::SetAccAttr(attributes, nsGkAtoms::tableCellIndex, stringIdx);
#ifdef DEBUG
nsAutoString unused;
attributes->SetStringProperty(NS_LITERAL_CSTRING("cppclass"),
NS_LITERAL_STRING("ARIAGridCellAccessible"),
unused);
#endif
return attributes.forget();
}
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 expose this info via object attributes to AT-SPI
// 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
// Change to |#define SHOW_LAYOUT_HEURISTIC DEBUG| before final release
#ifdef SHOW_LAYOUT_HEURISTIC
#define RETURN_LAYOUT_ANSWER(isLayout, heuristic) \
{ \
mLayoutHeuristic = isLayout ? \
NS_LITERAL_STRING("layout table: " heuristic) : \
NS_LITERAL_STRING("data table: " heuristic); \
return isLayout; \
}
#else
#define RETURN_LAYOUT_ANSWER(isLayout, heuristic) { return isLayout; }
#endif
DocAccessible* docAccessible = Document();
if (docAccessible) {
uint64_t docState = docAccessible->State();
if (docState & states::EDITABLE) { // Need to see all elements while document is being edited
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 (Role() != roles::TABLE)
RETURN_LAYOUT_ANSWER(false, "Has role attribute");
if (mContent->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::role)) {
// Role attribute is present, but overridden roles have already been dealt with.
// Only landmarks and other roles that don't override the role from native
// markup are left to deal with here.
RETURN_LAYOUT_ANSWER(false, "Has role attribute, weak role, and role is table");
}
NS_ASSERTION(mContent->IsHTMLElement(nsGkAtoms::table),
"table should not be built by CSS display:table style");
// Check if datatable attribute has "0" value.
if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::datatable,
NS_LITERAL_STRING("0"), eCaseMatters)) {
RETURN_LAYOUT_ANSWER(true, "Has datatable = 0 attribute, it's for layout");
}
// Check for legitimate data table attributes.
nsAutoString summary;
if (mContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::summary, summary) &&
!summary.IsEmpty())
RETURN_LAYOUT_ANSWER(false, "Has summary -- legitimate table structures");
// Check for legitimate data table elements.
Accessible* caption = FirstChild();
if (caption && caption->Role() == roles::CAPTION && caption->HasChildren())
RETURN_LAYOUT_ANSWER(false, "Not empty caption -- legitimate table structures");
for (nsIContent* childElm = mContent->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)) {
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(kNameSpaceID_None, nsGkAtoms::headers) ||
cellElm->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::scope) ||
cellElm->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::abbr)) {
RETURN_LAYOUT_ANSWER(false,
"Has headers, scope, or abbr attribute -- legitimate table structures");
}
Accessible* cell = mDoc->GetAccessible(cellElm);
if (cell && cell->ChildCount() == 1 &&
cell->FirstChild()->IsAbbreviation()) {
RETURN_LAYOUT_ANSWER(false,
"has abbr -- legitimate table structures");
}
}
}
}
}
}
}
if (HasDescendant(NS_LITERAL_STRING("table"))) {
RETURN_LAYOUT_ANSWER(true, "Has a nested table within it");
}
// If only 1 column or only 1 row, it's for layout
uint32_t colCount = ColCount();
if (colCount <=1) {
RETURN_LAYOUT_ANSWER(true, "Has only 1 column");
}
uint32_t 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(mContent->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->GetXULBorder(border);
if (border.top && border.bottom && border.left && border.right) {
RETURN_LAYOUT_ANSWER(false, "Has nonzero border-width on table cell");
}
/**
* 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).
uint32_t childCount = ChildCount();
nscolor rowColor = 0;
nscolor prevRowColor;
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
Accessible* child = GetChildAt(childIdx);
if (child->Role() == roles::ROW) {
prevRowColor = rowColor;
nsIFrame* rowFrame = child->GetFrame();
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");
}
if (HasDescendant(NS_LITERAL_STRING("embed")) ||
HasDescendant(NS_LITERAL_STRING("object")) ||
HasDescendant(NS_LITERAL_STRING("iframe"))) {
RETURN_LAYOUT_ANSWER(true, "Has no borders, and has iframe, object, or iframe, typical of advertisements");
}
RETURN_LAYOUT_ANSWER(false, "no layout factor strong enough, so will guess data");
}
void
AccGroupInfo::Update()
{
Accessible* parent = mItem->Parent();
if (!parent)
return;
int32_t indexInParent = mItem->IndexInParent();
uint32_t siblingCount = parent->ChildCount();
if (indexInParent == -1 ||
indexInParent >= static_cast<int32_t>(siblingCount)) {
NS_ERROR("Wrong index in parent! Tree invalidation problem.");
return;
}
int32_t level = nsAccUtils::GetARIAOrDefaultLevel(mItem);
// Compute position in set.
mPosInSet = 1;
for (int32_t idx = indexInParent - 1; idx >= 0 ; idx--) {
Accessible* sibling = parent->GetChildAt(idx);
roles::Role siblingRole = sibling->Role();
// If the sibling is separator then the group is ended.
if (siblingRole == roles::SEPARATOR)
break;
// If sibling is not visible and hasn't the same base role.
if (BaseRole(siblingRole) != mRole || sibling->State() & states::INVISIBLE)
continue;
// Check if it's hierarchical flatten structure, i.e. if the sibling
// level is lesser than this one then group is ended, if the sibling level
// is greater than this one then the group is split by some child elements
// (group will be continued).
int32_t siblingLevel = nsAccUtils::GetARIAOrDefaultLevel(sibling);
if (siblingLevel < level) {
mParent = sibling;
break;
}
// Skip subset.
if (siblingLevel > level)
continue;
// If the previous item in the group has calculated group information then
// build group information for this item based on found one.
if (sibling->mBits.groupInfo) {
mPosInSet += sibling->mBits.groupInfo->mPosInSet;
mParent = sibling->mBits.groupInfo->mParent;
mSetSize = sibling->mBits.groupInfo->mSetSize;
return;
}
mPosInSet++;
}
// Compute set size.
mSetSize = mPosInSet;
for (uint32_t idx = indexInParent + 1; idx < siblingCount; idx++) {
Accessible* sibling = parent->GetChildAt(idx);
roles::Role siblingRole = sibling->Role();
// If the sibling is separator then the group is ended.
if (siblingRole == roles::SEPARATOR)
break;
// If sibling is visible and has the same base role
if (BaseRole(siblingRole) != mRole || sibling->State() & states::INVISIBLE)
continue;
// and check if it's hierarchical flatten structure.
int32_t siblingLevel = nsAccUtils::GetARIAOrDefaultLevel(sibling);
if (siblingLevel < level)
break;
// Skip subset.
if (siblingLevel > level)
continue;
// If the next item in the group has calculated group information then
// build group information for this item based on found one.
if (sibling->mBits.groupInfo) {
mParent = sibling->mBits.groupInfo->mParent;
mSetSize = sibling->mBits.groupInfo->mSetSize;
return;
}
mSetSize++;
}
if (mParent)
return;
roles::Role parentRole = parent->Role();
if (ShouldReportRelations(mRole, parentRole))
mParent = parent;
// ARIA tree and list can be arranged by using ARIA groups to organize levels.
if (parentRole != roles::GROUPING)
return;
// Way #1 for ARIA tree (not ARIA treegrid): previous sibling of a group is a
// parent. In other words the parent of the tree item will be a group and
// the previous tree item of the group is a conceptual parent of the tree
// item.
if (mRole == roles::OUTLINEITEM) {
Accessible* parentPrevSibling = parent->PrevSibling();
if (parentPrevSibling && parentPrevSibling->Role() == mRole) {
mParent = parentPrevSibling;
return;
}
}
// Way #2 for ARIA list and tree: group is a child of an item. In other words
// the parent of the item will be a group and containing item of the group is
// a conceptual parent of the item.
if (mRole == roles::LISTITEM || mRole == roles::OUTLINEITEM) {
Accessible* grandParent = parent->Parent();
if (grandParent && grandParent->Role() == mRole)
mParent = grandParent;
}
}
void
RootAccessible::HandlePopupHidingEvent(nsINode* aPopupNode)
{
// Get popup accessible. There are cases when popup element isn't accessible
// but an underlying widget is and behaves like popup, an example is
// autocomplete popups.
DocAccessible* document = nsAccUtils::GetDocAccessibleFor(aPopupNode);
if (!document)
return;
Accessible* popup = document->GetAccessible(aPopupNode);
if (!popup) {
Accessible* popupContainer = document->GetContainerAccessible(aPopupNode);
if (!popupContainer)
return;
uint32_t childCount = popupContainer->ChildCount();
for (uint32_t idx = 0; idx < childCount; idx++) {
Accessible* child = popupContainer->GetChildAt(idx);
if (child->IsAutoCompletePopup()) {
popup = child;
break;
}
}
// No popup no events. Focus is managed by DOM. This is a case for
// menupopups of menus on Linux since there are no accessible for popups.
if (!popup)
return;
}
// In case of autocompletes and comboboxes fire state change event for
// expanded state. Note, HTML form autocomplete isn't a subject of state
// change event because they aren't autocompletes strictly speaking.
// When popup closes (except nested popups and menus) then fire focus event to
// where it was. The focus event is expected even if popup didn't take a focus.
static const uint32_t kNotifyOfFocus = 1;
static const uint32_t kNotifyOfState = 2;
uint32_t notifyOf = 0;
// HTML select is target of popuphidding event. Otherwise get container
// widget. No container widget means this is either tooltip or menupopup.
// No events in the former case.
Accessible* widget = nullptr;
if (popup->IsCombobox()) {
widget = popup;
} else {
widget = popup->ContainerWidget();
if (!widget) {
if (!popup->IsMenuPopup())
return;
widget = popup;
}
}
if (popup->IsAutoCompletePopup()) {
// No focus event for autocomplete because it's managed by
// DOMMenuItemInactive events.
if (widget->IsAutoComplete())
notifyOf = kNotifyOfState;
} else if (widget->IsCombobox()) {
// Fire focus for active combobox, otherwise the focus is managed by DOM
// focus notifications. Always fire state change event.
if (widget->IsActiveWidget())
notifyOf = kNotifyOfFocus;
notifyOf |= kNotifyOfState;
} else if (widget->IsMenuButton()) {
// Can be a part of autocomplete.
Accessible* compositeWidget = widget->ContainerWidget();
if (compositeWidget && compositeWidget->IsAutoComplete()) {
widget = compositeWidget;
notifyOf = kNotifyOfState;
}
// Autocomplete (like searchbar) can be inactive when popup hiddens
notifyOf |= kNotifyOfFocus;
} else if (widget == popup) {
// Top level context menus and alerts.
// Ignore submenus and menubar. When submenu is closed then sumbenu
// container menuitem takes a focus via DOMMenuItemActive notification.
// For menubars processing we listen DOMMenubarActive/Inactive
// notifications.
notifyOf = kNotifyOfFocus;
}
// Restore focus to where it was.
if (notifyOf & kNotifyOfFocus) {
FocusMgr()->ActiveItemChanged(nullptr);
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eFocus))
logging::ActiveItemChangeCausedBy("popuphiding", popup);
#endif
}
// Fire expanded state change event.
if (notifyOf & kNotifyOfState) {
nsRefPtr<AccEvent> event =
new AccStateChangeEvent(widget, states::EXPANDED, false);
document->FireDelayedEvent(event);
}
}
bool
TableAccessible::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 ? \
NS_LITERAL_STRING("layout table: " heuristic) : \
NS_LITERAL_STRING("data table: " heuristic); \
return isLayout; \
}
#else
#define RETURN_LAYOUT_ANSWER(isLayout, heuristic) { return isLayout; }
#endif
Accessible* thisacc = AsAccessible();
// Need to see all elements while document is being edited.
if (thisacc->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 (thisacc->HasARIARole()) {
RETURN_LAYOUT_ANSWER(false, "Has role attribute");
}
dom::Element* el = thisacc->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,
NS_LITERAL_STRING("0"), eCaseMatters)) {
RETURN_LAYOUT_ANSWER(true, "Has datatable = 0 attribute, it's for layout");
}
// Check for legitimate data table attributes.
nsAutoString summary;
if (el->GetAttr(kNameSpaceID_None, nsGkAtoms::summary, summary) &&
!summary.IsEmpty()) {
RETURN_LAYOUT_ANSWER(false, "Has summary -- legitimate table structures");
}
// Check for legitimate data table elements.
Accessible* caption = thisacc->FirstChild();
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)) {
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(kNameSpaceID_None, nsGkAtoms::headers) ||
cellElm->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::scope) ||
cellElm->AsElement()->HasAttr(kNameSpaceID_None, nsGkAtoms::abbr)) {
RETURN_LAYOUT_ANSWER(false,
"Has headers, scope, or abbr attribute -- legitimate table structures");
}
Accessible* cell = thisacc->Document()->GetAccessible(cellElm);
if (cell && cell->ChildCount() == 1 &&
cell->FirstChild()->IsAbbreviation()) {
RETURN_LAYOUT_ANSWER(false,
"has abbr -- legitimate table structures");
}
}
}
}
}
}
}
// Check for nested tables.
nsCOMPtr<nsIHTMLCollection> nestedTables =
el->GetElementsByTagName(NS_LITERAL_STRING("table"));
if (nestedTables->Length() > 0) {
RETURN_LAYOUT_ANSWER(true, "Has a nested table within it");
}
// 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->GetXULBorder(border);
if (border.top && border.bottom && border.left && border.right) {
RETURN_LAYOUT_ANSWER(false, "Has nonzero border-width on table cell");
}
// 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 = thisacc->ChildCount();
nscolor rowColor = 0;
nscolor prevRowColor;
for (auto childIdx = 0U; childIdx < childCount; childIdx++) {
Accessible* child = thisacc->GetChildAt(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 = thisacc->Document()->GetFrame();
nsSize documentSize = documentFrame->GetSize();
if (documentSize.width > 0) {
nsSize tableSize = thisacc->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[] = {
NS_LITERAL_STRING("embed"),
NS_LITERAL_STRING("object"),
NS_LITERAL_STRING("iframe")
};
for (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"
);
}