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;
}
Accessible*
AccGroupInfo::FirstItemOf(Accessible* aContainer)
{
// ARIA tree can be arranged by ARIA groups case #1 (previous sibling of a
// group is a parent) or by aria-level.
a11y::role containerRole = aContainer->Role();
Accessible* item = aContainer->NextSibling();
if (item) {
if (containerRole == roles::OUTLINEITEM && item->Role() == roles::GROUPING)
item = item->FirstChild();
if (item) {
AccGroupInfo* itemGroupInfo = item->GetGroupInfo();
if (itemGroupInfo && itemGroupInfo->ConceptualParent() == aContainer)
return item;
}
}
// ARIA list and tree can be arranged by ARIA groups case #2 (group is
// a child of an item).
item = aContainer->LastChild();
if (!item)
return nullptr;
if (item->Role() == roles::GROUPING &&
(containerRole == roles::LISTITEM || containerRole == roles::OUTLINEITEM)) {
item = item->FirstChild();
if (item) {
AccGroupInfo* itemGroupInfo = item->GetGroupInfo();
if (itemGroupInfo && itemGroupInfo->ConceptualParent() == aContainer)
return item;
}
}
// Otherwise, it can be a direct child if the container is a list or tree.
item = aContainer->FirstChild();
if (ShouldReportRelations(item->Role(), containerRole))
return item;
return nullptr;
}