bool
StructuredCloneHelper::WriteCallback(JSContext* aCx,
JSStructuredCloneWriter* aWriter,
JS::Handle<JSObject*> aObj)
{
if (!mSupportsCloning) {
return false;
}
// See if this is a File/Blob object.
{
Blob* blob = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(Blob, aObj, blob))) {
BlobImpl* blobImpl = blob->Impl();
if (JS_WriteUint32Pair(aWriter, SCTAG_DOM_BLOB,
mBlobImplArray.Length())) {
mBlobImplArray.AppendElement(blobImpl);
return true;
}
return false;
}
}
{
FileList* fileList = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(FileList, aObj, fileList))) {
// A FileList is serialized writing the X number of elements and the offset
// from mBlobImplArray. The Read will take X elements from mBlobImplArray
// starting from the offset.
if (!JS_WriteUint32Pair(aWriter, SCTAG_DOM_FILELIST,
fileList->Length()) ||
!JS_WriteUint32Pair(aWriter, 0,
mBlobImplArray.Length())) {
return false;
}
for (uint32_t i = 0; i < fileList->Length(); ++i) {
mBlobImplArray.AppendElement(fileList->Item(i)->Impl());
}
return true;
}
}
// See if this is an ImageBitmap object.
{
ImageBitmap* imageBitmap = nullptr;
if (NS_SUCCEEDED(UNWRAP_OBJECT(ImageBitmap, aObj, imageBitmap))) {
return ImageBitmap::WriteStructuredClone(aWriter,
GetImages(),
imageBitmap);
}
}
return NS_DOMWriteStructuredClone(aCx, aWriter, aObj, nullptr);
}
nsresult
nsFileControlFrame::DnDListener::GetBlobImplForWebkitDirectory(nsIDOMFileList* aFileList,
BlobImpl** aBlobImpl)
{
*aBlobImpl = nullptr;
HTMLInputElement* inputElement =
HTMLInputElement::FromContent(mFrame->GetContent());
bool webkitDirPicker =
Preferences::GetBool("dom.webkitBlink.dirPicker.enabled", false) &&
inputElement->HasAttr(kNameSpaceID_None, nsGkAtoms::webkitdirectory);
if (!webkitDirPicker) {
return NS_OK;
}
if (!aFileList) {
return NS_ERROR_FAILURE;
}
FileList* files = static_cast<FileList*>(aFileList);
// webkitdirectory doesn't care about the length of the file list but
// only about the first item on it.
uint32_t len = files->Length();
if (len) {
File* file = files->Item(0);
if (file) {
BlobImpl* impl = file->Impl();
if (impl && impl->IsDirectory()) {
RefPtr<BlobImpl> retVal = impl;
retVal.swap(*aBlobImpl);
return NS_OK;
}
}
}
return NS_ERROR_FAILURE;
}
/**
* This is called when we receive a drop or a dragover.
*/
NS_IMETHODIMP
nsFileControlFrame::DnDListener::HandleEvent(nsIDOMEvent* aEvent)
{
NS_ASSERTION(mFrame, "We should have been unregistered");
bool defaultPrevented = false;
aEvent->GetDefaultPrevented(&defaultPrevented);
if (defaultPrevented) {
return NS_OK;
}
nsCOMPtr<nsIDOMDragEvent> dragEvent = do_QueryInterface(aEvent);
if (!dragEvent) {
return NS_OK;
}
nsCOMPtr<nsIDOMDataTransfer> dataTransfer;
dragEvent->GetDataTransfer(getter_AddRefs(dataTransfer));
if (!IsValidDropData(dataTransfer)) {
return NS_OK;
}
nsCOMPtr<nsIContent> content = mFrame->GetContent();
bool supportsMultiple = content && content->HasAttr(kNameSpaceID_None, nsGkAtoms::multiple);
if (!CanDropTheseFiles(dataTransfer, supportsMultiple)) {
dataTransfer->SetDropEffect(NS_LITERAL_STRING("none"));
aEvent->StopPropagation();
return NS_OK;
}
nsAutoString eventType;
aEvent->GetType(eventType);
if (eventType.EqualsLiteral("dragover")) {
// Prevent default if we can accept this drag data
aEvent->PreventDefault();
return NS_OK;
}
if (eventType.EqualsLiteral("drop")) {
aEvent->StopPropagation();
aEvent->PreventDefault();
NS_ASSERTION(content, "The frame has no content???");
HTMLInputElement* inputElement = HTMLInputElement::FromContent(content);
NS_ASSERTION(inputElement, "No input element for this file upload control frame!");
nsCOMPtr<nsIDOMFileList> fileList;
dataTransfer->GetFiles(getter_AddRefs(fileList));
RefPtr<BlobImpl> webkitDir;
nsresult rv =
GetBlobImplForWebkitDirectory(fileList, getter_AddRefs(webkitDir));
NS_ENSURE_SUCCESS(rv, NS_OK);
nsTArray<OwningFileOrDirectory> array;
if (webkitDir) {
AppendBlobImplAsDirectory(array, webkitDir, content);
inputElement->MozSetDndFilesAndDirectories(array);
} else {
bool blinkFileSystemEnabled =
Preferences::GetBool("dom.webkitBlink.filesystem.enabled", false);
if (blinkFileSystemEnabled) {
FileList* files = static_cast<FileList*>(fileList.get());
if (files) {
for (uint32_t i = 0; i < files->Length(); ++i) {
File* file = files->Item(i);
if (file) {
if (file->Impl() && file->Impl()->IsDirectory()) {
AppendBlobImplAsDirectory(array, file->Impl(), content);
} else {
OwningFileOrDirectory* element = array.AppendElement();
element->SetAsFile() = file;
}
}
}
}
}
// This is rather ugly. Pass the directories as Files using SetFiles,
// but then if blink filesystem API is enabled, it wants
// FileOrDirectory array.
inputElement->SetFiles(fileList, true);
if (blinkFileSystemEnabled) {
inputElement->UpdateEntries(array);
}
nsContentUtils::DispatchTrustedEvent(content->OwnerDoc(), content,
NS_LITERAL_STRING("input"), true,
false);
nsContentUtils::DispatchTrustedEvent(content->OwnerDoc(), content,
NS_LITERAL_STRING("change"), true,
false);
}
}
return NS_OK;
}