already_AddRefed<SVGTransform>
DOMSVGTransformList::Initialize(SVGTransform& newItem, ErrorResult& error)
{
if (IsAnimValList()) {
error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return nullptr;
}
// If newItem is already in a list we should insert a clone of newItem, and
// for consistency, this should happen even if *this* is the list that
// newItem is currently in. Note that in the case of newItem being in this
// list, the Clear() call before the InsertItemBefore() call would remove it
// from this list, and so the InsertItemBefore() call would not insert a
// clone of newItem, it would actually insert newItem. To prevent that from
// happening we have to do the clone here, if necessary.
nsRefPtr<SVGTransform> domItem = &newItem;
if (domItem->HasOwner()) {
domItem = newItem.Clone();
}
Clear(error);
MOZ_ASSERT(!error.Failed(), "How could this fail?");
return InsertItemBefore(*domItem, 0, error);
}
already_AddRefed<SVGTransform>
DOMSVGTransformList::ReplaceItem(SVGTransform& newItem,
uint32_t index, ErrorResult& error)
{
if (IsAnimValList()) {
error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return nullptr;
}
if (index >= LengthNoFlush()) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
nsRefPtr<SVGTransform> domItem = &newItem;
if (newItem.HasOwner()) {
domItem = newItem.Clone(); // must do this before changing anything!
}
AutoChangeTransformListNotifier notifier(this);
if (mItems[index]) {
// Notify any existing DOM item of removal *before* modifying the lists so
// that the DOM item can copy the *old* value at its index:
mItems[index]->RemovingFromList();
}
InternalList()[index] = domItem->ToSVGTransform();
mItems[index] = domItem;
// This MUST come after the ToSVGPoint() call, otherwise that call
// would end up reading bad data from InternalList()!
domItem->InsertingIntoList(this, index, IsAnimValList());
return domItem.forget();
}
already_AddRefed<SVGTransform>
DOMSVGTransformList::InsertItemBefore(SVGTransform& newItem,
uint32_t index, ErrorResult& error)
{
if (IsAnimValList()) {
error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return nullptr;
}
index = std::min(index, LengthNoFlush());
if (index >= SVGTransform::MaxListIndex()) {
error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
nsRefPtr<SVGTransform> domItem = &newItem;
if (newItem.HasOwner()) {
domItem = newItem.Clone(); // must do this before changing anything!
}
// Ensure we have enough memory so we can avoid complex error handling below:
if (!mItems.SetCapacity(mItems.Length() + 1) ||
!InternalList().SetCapacity(InternalList().Length() + 1)) {
error.Throw(NS_ERROR_OUT_OF_MEMORY);
return nullptr;
}
nsAttrValue emptyOrOldValue = Element()->WillChangeTransformList();
// Now that we know we're inserting, keep animVal list in sync as necessary.
MaybeInsertNullInAnimValListAt(index);
InternalList().InsertItem(index, domItem->ToSVGTransform());
mItems.InsertElementAt(index, domItem.get());
// This MUST come after the insertion into InternalList(), or else under the
// insertion into InternalList() the values read from domItem would be bad
// data from InternalList() itself!:
domItem->InsertingIntoList(this, index, IsAnimValList());
UpdateListIndicesFromIndex(mItems, index + 1);
Element()->DidChangeTransformList(emptyOrOldValue);
if (mAList->IsAnimating()) {
Element()->AnimationNeedsResample();
}
return domItem.forget();
}