void
OnSetDirAttr(Element* aElement, const nsAttrValue* aNewValue,
bool hadValidDir, bool aNotify)
{
if (aElement->IsHTML() && aElement->NodeInfo()->Equals(nsGkAtoms::input)) {
return;
}
if (aElement->AncestorHasDirAuto()) {
if (!hadValidDir) {
// The element is a descendant of an element with dir = auto, is
// having its dir attribute set, and previously didn't have a valid dir
// attribute.
// Check whether any of its text node descendants determine the
// direction of any of its ancestors, and redetermine their direction
WalkDescendantsResetAutoDirection(aElement);
} else if (!aElement->HasValidDir()) {
// The element is a descendant of an element with dir = auto and is
// having its dir attribute removed or set to an invalid value.
// Reset the direction of any of its ancestors whose direction is
// determined by a text node descendant
WalkAncestorsResetAutoDirection(aElement, aNotify);
}
}
if (aElement->HasDirAuto()) {
WalkDescendantsSetDirAuto(aElement, aNotify);
} else {
SetDirectionalityOnDescendants(aElement,
RecomputeDirectionality(aElement, aNotify),
aNotify);
}
}
void ResetDir(mozilla::dom::Element* aElement)
{
if (aElement->HasDirAutoSet()) {
nsINode* setByNode =
static_cast<nsINode*>(aElement->GetProperty(nsGkAtoms::dirAutoSetBy));
nsTextNodeDirectionalityMap::RemoveElementFromMap(setByNode, aElement);
}
if (!aElement->HasDirAuto()) {
RecomputeDirectionality(aElement, false);
}
}
void
SetDirOnBind(mozilla::dom::Element* aElement, nsIContent* aParent)
{
// Set the AncestorHasDirAuto flag, unless this element shouldn't affect
// ancestors that have dir=auto
if (!DoesNotParticipateInAutoDirection(aElement) &&
!aElement->IsHTML(nsGkAtoms::bdi) &&
aParent && aParent->NodeOrAncestorHasDirAuto()) {
aElement->SetAncestorHasDirAuto();
nsIContent* child = aElement->GetFirstChild();
if (child) {
// If we are binding an element to the tree that already has descendants,
// and the parent has NodeHasDirAuto or NodeAncestorHasDirAuto, we need
// to set NodeAncestorHasDirAuto on all the element's descendants, except
// for nodes that don't affect the direction of their ancestors.
do {
if (child->IsElement() &&
DoesNotAffectDirectionOfAncestors(child->AsElement())) {
child = child->GetNextNonChildNode(aElement);
continue;
}
child->SetAncestorHasDirAuto();
child = child->GetNextNode(aElement);
} while (child);
// We may also need to reset the direction of an ancestor with dir=auto
WalkAncestorsResetAutoDirection(aElement, true);
}
}
if (!aElement->HasDirAuto()) {
// if the element doesn't have dir=auto, set its own directionality from
// the dir attribute or by inheriting from its ancestors.
RecomputeDirectionality(aElement, false);
}
}
