void
DataTransfer::ClearData(const Optional<nsAString>& aFormat, ErrorResult& aRv)
{
if (mReadOnly) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (mItems.Length() == 0) {
return;
}
if (aFormat.WasPassed()) {
MozClearDataAtHelper(aFormat.Value(), 0, aRv);
} else {
MozClearDataAtHelper(EmptyString(), 0, aRv);
}
}
void
DataTransfer::ClearData(const Optional<nsAString>& aFormat,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv)
{
if (IsReadOnly()) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (MozItemCount() == 0) {
return;
}
if (aFormat.WasPassed()) {
MozClearDataAtHelper(aFormat.Value(), 0, aSubjectPrincipal, aRv);
} else {
MozClearDataAtHelper(EmptyString(), 0, aSubjectPrincipal, aRv);
}
}
void
DataTransfer::MozClearDataAt(const nsAString& aFormat, uint32_t aIndex,
const Maybe<nsIPrincipal*>& aSubjectPrincipal,
ErrorResult& aRv)
{
MOZ_ASSERT(aSubjectPrincipal.isSome());
if (mReadOnly) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (aIndex >= MozItemCount()) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
// Only the first item is valid for clipboard events
if (aIndex > 0 &&
(mEventMessage == eCut || mEventMessage == eCopy ||
mEventMessage == ePaste)) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
MozClearDataAtHelper(aFormat, aIndex, aSubjectPrincipal, aRv);
// If we just cleared the 0-th index, and there are still more than 1 indexes
// remaining, MozClearDataAt should cause the 1st index to become the 0th
// index. This should _only_ happen when the MozClearDataAt function is
// explicitly called by script, as this behavior is inconsistent with spec.
// (however, so is the MozClearDataAt API)
if (aIndex == 0 && mItems->MozItemCount() > 1 &&
mItems->MozItemsAt(0)->Length() == 0) {
mItems->PopIndexZero();
}
}
void
DataTransfer::MozClearDataAt(const nsAString& aFormat, uint32_t aIndex,
ErrorResult& aRv)
{
if (mReadOnly) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (aIndex >= mItems.Length()) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
// Only the first item is valid for clipboard events
if (aIndex > 0 &&
(mEventType == NS_CUT || mEventType == NS_COPY || mEventType == NS_PASTE)) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
MozClearDataAtHelper(aFormat, aIndex, aRv);
}
