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gecko-dev/dom/base/nsContentAreaDragDrop.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsReadableUtils.h"
// Local Includes
#include "nsContentAreaDragDrop.h"
// Helper Classes
#include "nsString.h"
// Interfaces needed to be included
#include "nsCopySupport.h"
#include "nsIDOMUIEvent.h"
#include "nsISelection.h"
#include "nsISelectionController.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMEvent.h"
#include "nsIDOMDragEvent.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMRange.h"
#include "nsIFormControl.h"
#include "nsITransferable.h"
#include "nsComponentManagerUtils.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsServiceManagerUtils.h"
#include "nsNetUtil.h"
#include "nsIFile.h"
#include "nsFrameLoader.h"
#include "nsIWebNavigation.h"
#include "nsIDocShell.h"
#include "nsIContent.h"
#include "nsIImageLoadingContent.h"
#include "nsITextControlElement.h"
#include "nsUnicharUtils.h"
#include "nsIURL.h"
#include "nsIURIMutator.h"
#include "nsIDocument.h"
#include "nsIScriptSecurityManager.h"
#include "nsIPrincipal.h"
#include "nsIDocShellTreeItem.h"
#include "nsIWebBrowserPersist.h"
#include "nsEscape.h"
#include "nsContentUtils.h"
#include "nsIMIMEService.h"
#include "imgIContainer.h"
#include "imgIRequest.h"
#include "mozilla/dom/DataTransfer.h"
#include "nsIMIMEInfo.h"
#include "nsRange.h"
#include "TabParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLAreaElement.h"
#include "mozilla/dom/HTMLAnchorElement.h"
#include "nsVariant.h"
using namespace mozilla::dom;
using mozilla::IgnoreErrors;
class MOZ_STACK_CLASS DragDataProducer
{
public:
DragDataProducer(nsPIDOMWindowOuter* aWindow,
nsIContent* aTarget,
nsIContent* aSelectionTargetNode,
bool aIsAltKeyPressed);
nsresult Produce(DataTransfer* aDataTransfer,
bool* aCanDrag,
nsISelection** aSelection,
nsIContent** aDragNode,
nsACString& aPrincipalURISpec);
private:
void AddString(DataTransfer* aDataTransfer,
const nsAString& aFlavor,
const nsAString& aData,
nsIPrincipal* aPrincipal);
nsresult AddStringsToDataTransfer(nsIContent* aDragNode,
DataTransfer* aDataTransfer);
static nsresult GetDraggableSelectionData(nsISelection* inSelection,
nsIContent* inRealTargetNode,
nsIContent **outImageOrLinkNode,
bool* outDragSelectedText);
static already_AddRefed<nsIContent> FindParentLinkNode(nsIContent* inNode);
static MOZ_MUST_USE nsresult
GetAnchorURL(nsIContent* inNode, nsAString& outURL);
static void GetNodeString(nsIContent* inNode, nsAString & outNodeString);
static void CreateLinkText(const nsAString& inURL, const nsAString & inText,
nsAString& outLinkText);
nsCOMPtr<nsPIDOMWindowOuter> mWindow;
nsCOMPtr<nsIContent> mTarget;
nsCOMPtr<nsIContent> mSelectionTargetNode;
bool mIsAltKeyPressed;
nsString mUrlString;
nsString mImageSourceString;
nsString mImageDestFileName;
nsString mTitleString;
// will be filled automatically if you fill urlstring
nsString mHtmlString;
nsString mContextString;
nsString mInfoString;
bool mIsAnchor;
nsCOMPtr<imgIContainer> mImage;
};
nsresult
nsContentAreaDragDrop::GetDragData(nsPIDOMWindowOuter* aWindow,
nsIContent* aTarget,
nsIContent* aSelectionTargetNode,
bool aIsAltKeyPressed,
DataTransfer* aDataTransfer,
bool* aCanDrag,
nsISelection** aSelection,
nsIContent** aDragNode,
nsACString& aPrincipalURISpec)
{
NS_ENSURE_TRUE(aSelectionTargetNode, NS_ERROR_INVALID_ARG);
*aCanDrag = true;
DragDataProducer
provider(aWindow, aTarget, aSelectionTargetNode, aIsAltKeyPressed);
return provider.Produce(aDataTransfer, aCanDrag, aSelection, aDragNode,
aPrincipalURISpec);
}
NS_IMPL_ISUPPORTS(nsContentAreaDragDropDataProvider, nsIFlavorDataProvider)
// SaveURIToFile
// used on platforms where it's possible to drag items (e.g. images)
// into the file system
nsresult
nsContentAreaDragDropDataProvider::SaveURIToFile(nsAString& inSourceURIString,
nsIFile* inDestFile,
bool isPrivate)
{
nsCOMPtr<nsIURI> sourceURI;
nsresult rv = NS_NewURI(getter_AddRefs(sourceURI), inSourceURIString);
if (NS_FAILED(rv)) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIURL> sourceURL = do_QueryInterface(sourceURI);
if (!sourceURL) {
return NS_ERROR_NO_INTERFACE;
}
rv = inDestFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
NS_ENSURE_SUCCESS(rv, rv);
// we rely on the fact that the WPB is refcounted by the channel etc,
// so we don't keep a ref to it. It will die when finished.
nsCOMPtr<nsIWebBrowserPersist> persist =
do_CreateInstance("@mozilla.org/embedding/browser/nsWebBrowserPersist;1",
&rv);
NS_ENSURE_SUCCESS(rv, rv);
persist->SetPersistFlags(nsIWebBrowserPersist::PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION);
// referrer policy can be anything since the referrer is nullptr
return persist->SavePrivacyAwareURI(sourceURI, nullptr, nullptr,
mozilla::net::RP_Unset,
nullptr, nullptr,
inDestFile, isPrivate);
}
// This is our nsIFlavorDataProvider callback. There are several
// assumptions here that make this work:
//
// 1. Someone put a kFilePromiseURLMime flavor into the transferable
// with the source URI of the file to save (as a string). We did
// that in AddStringsToDataTransfer.
//
// 2. Someone put a kFilePromiseDirectoryMime flavor into the
// transferable with an nsIFile for the directory we are to
// save in. That has to be done by platform-specific code (in
// widget), which gets the destination directory from
// OS-specific drag information.
//
NS_IMETHODIMP
nsContentAreaDragDropDataProvider::GetFlavorData(nsITransferable *aTransferable,
const char *aFlavor,
nsISupports **aData,
uint32_t *aDataLen)
{
NS_ENSURE_ARG_POINTER(aData && aDataLen);
*aData = nullptr;
*aDataLen = 0;
nsresult rv = NS_ERROR_NOT_IMPLEMENTED;
if (strcmp(aFlavor, kFilePromiseMime) == 0) {
// get the URI from the kFilePromiseURLMime flavor
NS_ENSURE_ARG(aTransferable);
nsCOMPtr<nsISupports> tmp;
uint32_t dataSize = 0;
aTransferable->GetTransferData(kFilePromiseURLMime,
getter_AddRefs(tmp), &dataSize);
nsCOMPtr<nsISupportsString> supportsString =
do_QueryInterface(tmp);
if (!supportsString)
return NS_ERROR_FAILURE;
nsAutoString sourceURLString;
supportsString->GetData(sourceURLString);
if (sourceURLString.IsEmpty())
return NS_ERROR_FAILURE;
aTransferable->GetTransferData(kFilePromiseDestFilename,
getter_AddRefs(tmp), &dataSize);
supportsString = do_QueryInterface(tmp);
if (!supportsString)
return NS_ERROR_FAILURE;
nsAutoString targetFilename;
supportsString->GetData(targetFilename);
if (targetFilename.IsEmpty())
return NS_ERROR_FAILURE;
// get the target directory from the kFilePromiseDirectoryMime
// flavor
nsCOMPtr<nsISupports> dirPrimitive;
dataSize = 0;
aTransferable->GetTransferData(kFilePromiseDirectoryMime,
getter_AddRefs(dirPrimitive), &dataSize);
nsCOMPtr<nsIFile> destDirectory = do_QueryInterface(dirPrimitive);
if (!destDirectory)
return NS_ERROR_FAILURE;
nsCOMPtr<nsIFile> file;
rv = destDirectory->Clone(getter_AddRefs(file));
NS_ENSURE_SUCCESS(rv, rv);
file->Append(targetFilename);
bool isPrivate;
aTransferable->GetIsPrivateData(&isPrivate);
rv = SaveURIToFile(sourceURLString, file, isPrivate);
// send back an nsIFile
if (NS_SUCCEEDED(rv)) {
CallQueryInterface(file, aData);
*aDataLen = sizeof(nsIFile*);
}
}
return rv;
}
DragDataProducer::DragDataProducer(nsPIDOMWindowOuter* aWindow,
nsIContent* aTarget,
nsIContent* aSelectionTargetNode,
bool aIsAltKeyPressed)
: mWindow(aWindow),
mTarget(aTarget),
mSelectionTargetNode(aSelectionTargetNode),
mIsAltKeyPressed(aIsAltKeyPressed),
mIsAnchor(false)
{
}
//
// FindParentLinkNode
//
// Finds the parent with the given link tag starting at |inNode|. If
// it gets up to the root without finding it, we stop looking and
// return null.
//
already_AddRefed<nsIContent>
DragDataProducer::FindParentLinkNode(nsIContent* inNode)
{
nsIContent* content = inNode;
if (!content) {
// That must have been the document node; nothing else to do here;
return nullptr;
}
for (; content; content = content->GetParent()) {
if (nsContentUtils::IsDraggableLink(content)) {
nsCOMPtr<nsIContent> ret = content;
return ret.forget();
}
}
return nullptr;
}
//
// GetAnchorURL
//
nsresult
DragDataProducer::GetAnchorURL(nsIContent* inNode, nsAString& outURL)
{
nsCOMPtr<nsIURI> linkURI;
if (!inNode || !inNode->IsLink(getter_AddRefs(linkURI))) {
// Not a link
outURL.Truncate();
return NS_OK;
}
nsAutoCString spec;
nsresult rv = linkURI->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
CopyUTF8toUTF16(spec, outURL);
return NS_OK;
}
//
// CreateLinkText
//
// Creates the html for an anchor in the form
// <a href="inURL">inText</a>
//
void
DragDataProducer::CreateLinkText(const nsAString& inURL,
const nsAString & inText,
nsAString& outLinkText)
{
// use a temp var in case |inText| is the same string as
// |outLinkText| to avoid overwriting it while building up the
// string in pieces.
nsAutoString linkText(NS_LITERAL_STRING("<a href=\"") +
inURL +
NS_LITERAL_STRING("\">") +
inText +
NS_LITERAL_STRING("</a>") );
outLinkText = linkText;
}
//
// GetNodeString
//
// Gets the text associated with a node
//
void
DragDataProducer::GetNodeString(nsIContent* inNode,
nsAString & outNodeString)
{
nsCOMPtr<nsINode> node = inNode;
outNodeString.Truncate();
// use a range to get the text-equivalent of the node
nsCOMPtr<nsIDocument> doc = node->OwnerDoc();
RefPtr<nsRange> range = doc->CreateRange(IgnoreErrors());
if (range) {
range->SelectNode(*node, IgnoreErrors());
range->ToString(outNodeString);
}
}
nsresult
DragDataProducer::Produce(DataTransfer* aDataTransfer,
bool* aCanDrag,
nsISelection** aSelection,
nsIContent** aDragNode,
nsACString& aPrincipalURISpec)
{
NS_PRECONDITION(aCanDrag && aSelection && aDataTransfer && aDragNode,
"null pointer passed to Produce");
NS_ASSERTION(mWindow, "window not set");
NS_ASSERTION(mSelectionTargetNode, "selection target node should have been set");
*aDragNode = nullptr;
nsresult rv;
nsIContent* dragNode = nullptr;
*aSelection = nullptr;
// Find the selection to see what we could be dragging and if what we're
// dragging is in what is selected. If this is an editable textbox, use
// the textbox's selection, otherwise use the window's selection.
nsCOMPtr<nsISelection> selection;
nsIContent* editingElement = mSelectionTargetNode->IsEditable() ?
mSelectionTargetNode->GetEditingHost() : nullptr;
nsCOMPtr<nsITextControlElement> textControl =
nsITextControlElement::GetTextControlElementFromEditingHost(editingElement);
if (textControl) {
nsISelectionController* selcon = textControl->GetSelectionController();
if (selcon) {
selcon->GetSelection(nsISelectionController::SELECTION_NORMAL, getter_AddRefs(selection));
}
if (!selection)
return NS_OK;
}
else {
selection = mWindow->GetSelection();
if (!selection)
return NS_OK;
// Check if the node is inside a form control. Don't set aCanDrag to false
//however, as we still want to allow the drag.
nsCOMPtr<nsIContent> findFormNode = mSelectionTargetNode;
nsIContent* findFormParent = findFormNode->GetParent();
while (findFormParent) {
nsCOMPtr<nsIFormControl> form(do_QueryInterface(findFormParent));
if (form && !form->AllowDraggableChildren()) {
return NS_OK;
}
findFormParent = findFormParent->GetParent();
}
}
// if set, serialize the content under this node
nsCOMPtr<nsIContent> nodeToSerialize;
nsCOMPtr<nsIDocShellTreeItem> dsti = mWindow->GetDocShell();
const bool isChromeShell =
dsti && dsti->ItemType() == nsIDocShellTreeItem::typeChrome;
// In chrome shells, only allow dragging inside editable areas.
if (isChromeShell && !editingElement) {
nsCOMPtr<nsIFrameLoaderOwner> flo = do_QueryInterface(mTarget);
if (flo) {
RefPtr<nsFrameLoader> fl = flo->GetFrameLoader();
if (fl) {
TabParent* tp = static_cast<TabParent*>(fl->GetRemoteBrowser());
if (tp) {
// We have a TabParent, so it may have data for dnd in case the child
// process started a dnd session.
tp->AddInitialDnDDataTo(aDataTransfer, aPrincipalURISpec);
}
}
}
return NS_OK;
}
if (isChromeShell && textControl) {
// Only use the selection if the target node is in the selection.
bool selectionContainsTarget = false;
nsCOMPtr<nsIDOMNode> targetNode = do_QueryInterface(mSelectionTargetNode);
selection->ContainsNode(targetNode, false, &selectionContainsTarget);
if (!selectionContainsTarget)
return NS_OK;
selection.swap(*aSelection);
}
else {
// In content shells, a number of checks are made below to determine
// whether an image or a link is being dragged. If so, add additional
// data to the data transfer. This is also done for chrome shells, but
// only when in a non-textbox editor.
bool haveSelectedContent = false;
// possible parent link node
nsCOMPtr<nsIContent> parentLink;
nsCOMPtr<nsIContent> draggedNode;
{
// only drag form elements by using the alt key,
// otherwise buttons and select widgets are hard to use
// Note that while <object> elements implement nsIFormControl, we should
// really allow dragging them if they happen to be images.
nsCOMPtr<nsIFormControl> form(do_QueryInterface(mTarget));
if (form && !mIsAltKeyPressed && form->ControlType() != NS_FORM_OBJECT) {
*aCanDrag = false;
return NS_OK;
}
draggedNode = mTarget;
}
nsCOMPtr<nsIImageLoadingContent> image;
nsCOMPtr<nsIContent> selectedImageOrLinkNode;
GetDraggableSelectionData(selection, mSelectionTargetNode,
getter_AddRefs(selectedImageOrLinkNode),
&haveSelectedContent);
// either plain text or anchor text is selected
if (haveSelectedContent) {
selection.swap(*aSelection);
} else if (selectedImageOrLinkNode) {
// an image is selected
image = do_QueryInterface(selectedImageOrLinkNode);
} else {
// nothing is selected -
//
// look for draggable elements under the mouse
//
// if the alt key is down, don't start a drag if we're in an
// anchor because we want to do selection.
parentLink = FindParentLinkNode(draggedNode);
if (parentLink && mIsAltKeyPressed) {
*aCanDrag = false;
return NS_OK;
}
image = do_QueryInterface(draggedNode);
}
{
// set for linked images, and links
nsCOMPtr<nsIContent> linkNode;
RefPtr<HTMLAreaElement> areaElem = HTMLAreaElement::FromContentOrNull(draggedNode);
if (areaElem) {
// use the alt text (or, if missing, the href) as the title
areaElem->GetAttribute(NS_LITERAL_STRING("alt"), mTitleString);
if (mTitleString.IsEmpty()) {
// this can be a relative link
areaElem->GetAttribute(NS_LITERAL_STRING("href"), mTitleString);
}
// we'll generate HTML like <a href="absurl">alt text</a>
mIsAnchor = true;
// gives an absolute link
nsresult rv = GetAnchorURL(draggedNode, mUrlString);
NS_ENSURE_SUCCESS(rv, rv);
mHtmlString.AssignLiteral("<a href=\"");
mHtmlString.Append(mUrlString);
mHtmlString.AppendLiteral("\">");
mHtmlString.Append(mTitleString);
mHtmlString.AppendLiteral("</a>");
dragNode = draggedNode;
} else if (image) {
mIsAnchor = true;
// grab the href as the url, use alt text as the title of the
// area if it's there. the drag data is the image tag and src
// attribute.
nsCOMPtr<nsIURI> imageURI;
image->GetCurrentURI(getter_AddRefs(imageURI));
if (imageURI) {
nsAutoCString spec;
rv = imageURI->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
CopyUTF8toUTF16(spec, mUrlString);
}
nsCOMPtr<Element> imageElement(do_QueryInterface(image));
// XXXbz Shouldn't we use the "title" attr for title? Using
// "alt" seems very wrong....
// XXXbz Also, what if this is an nsIImageLoadingContent
// that's not an <html:img>?
if (imageElement) {
imageElement->GetAttribute(NS_LITERAL_STRING("alt"), mTitleString);
}
if (mTitleString.IsEmpty()) {
mTitleString = mUrlString;
}
nsCOMPtr<imgIRequest> imgRequest;
// grab the image data, and its request.
nsCOMPtr<imgIContainer> img =
nsContentUtils::GetImageFromContent(image,
getter_AddRefs(imgRequest));
nsCOMPtr<nsIMIMEService> mimeService =
do_GetService("@mozilla.org/mime;1");
// Fix the file extension in the URL if necessary
if (imgRequest && mimeService) {
nsCOMPtr<nsIURI> imgUri;
imgRequest->GetURI(getter_AddRefs(imgUri));
nsCOMPtr<nsIURL> imgUrl(do_QueryInterface(imgUri));
if (imgUrl) {
nsAutoCString extension;
imgUrl->GetFileExtension(extension);
nsCString mimeType;
imgRequest->GetMimeType(getter_Copies(mimeType));
nsCOMPtr<nsIMIMEInfo> mimeInfo;
mimeService->GetFromTypeAndExtension(mimeType, EmptyCString(),
getter_AddRefs(mimeInfo));
if (mimeInfo) {
nsAutoCString spec;
rv = imgUrl->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
// pass out the image source string
CopyUTF8toUTF16(spec, mImageSourceString);
bool validExtension;
if (extension.IsEmpty() ||
NS_FAILED(mimeInfo->ExtensionExists(extension,
&validExtension)) ||
!validExtension) {
// Fix the file extension in the URL
nsAutoCString primaryExtension;
mimeInfo->GetPrimaryExtension(primaryExtension);
rv = NS_MutateURI(imgUrl)
.Apply(NS_MutatorMethod(&nsIURLMutator::SetFileExtension,
primaryExtension, nullptr))
.Finalize(imgUrl);
NS_ENSURE_SUCCESS(rv, rv);
}
nsAutoCString fileName;
imgUrl->GetFileName(fileName);
NS_UnescapeURL(fileName);
// make the filename safe for the filesystem
fileName.ReplaceChar(FILE_PATH_SEPARATOR FILE_ILLEGAL_CHARACTERS,
'-');
CopyUTF8toUTF16(fileName, mImageDestFileName);
// and the image object
mImage = img;
}
}
}
if (parentLink) {
// If we are dragging around an image in an anchor, then we
// are dragging the entire anchor
linkNode = parentLink;
nodeToSerialize = linkNode;
} else {
nodeToSerialize = do_QueryInterface(draggedNode);
}
dragNode = nodeToSerialize;
} else if (draggedNode && draggedNode->IsHTMLElement(nsGkAtoms::a)) {
// set linkNode. The code below will handle this
linkNode = do_QueryInterface(draggedNode); // XXX test this
GetNodeString(draggedNode, mTitleString);
} else if (parentLink) {
// parentLink will always be null if there's selected content
linkNode = parentLink;
nodeToSerialize = linkNode;
} else if (!haveSelectedContent) {
// nothing draggable
return NS_OK;
}
if (linkNode) {
mIsAnchor = true;
rv = GetAnchorURL(linkNode, mUrlString);
NS_ENSURE_SUCCESS(rv, rv);
dragNode = linkNode;
}
}
}
if (nodeToSerialize || *aSelection) {
mHtmlString.Truncate();
mContextString.Truncate();
mInfoString.Truncate();
mTitleString.Truncate();
nsCOMPtr<nsIDocument> doc = mWindow->GetDoc();
NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
// if we have selected text, use it in preference to the node
nsCOMPtr<nsITransferable> transferable;
if (*aSelection) {
rv = nsCopySupport::GetTransferableForSelection(*aSelection, doc,
getter_AddRefs(transferable));
}
else {
rv = nsCopySupport::GetTransferableForNode(nodeToSerialize, doc,
getter_AddRefs(transferable));
}
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsISupports> supports;
nsCOMPtr<nsISupportsString> data;
uint32_t dataSize;
rv = transferable->GetTransferData(kHTMLMime, getter_AddRefs(supports),
&dataSize);
data = do_QueryInterface(supports);
if (NS_SUCCEEDED(rv)) {
data->GetData(mHtmlString);
}
rv = transferable->GetTransferData(kHTMLContext, getter_AddRefs(supports),
&dataSize);
data = do_QueryInterface(supports);
if (NS_SUCCEEDED(rv)) {
data->GetData(mContextString);
}
rv = transferable->GetTransferData(kHTMLInfo, getter_AddRefs(supports),
&dataSize);
data = do_QueryInterface(supports);
if (NS_SUCCEEDED(rv)) {
data->GetData(mInfoString);
}
rv = transferable->GetTransferData(kUnicodeMime, getter_AddRefs(supports),
&dataSize);
data = do_QueryInterface(supports);
NS_ENSURE_SUCCESS(rv, rv); // require plain text at a minimum
data->GetData(mTitleString);
}
// default text value is the URL
if (mTitleString.IsEmpty()) {
mTitleString = mUrlString;
}
// if we haven't constructed a html version, make one now
if (mHtmlString.IsEmpty() && !mUrlString.IsEmpty())
CreateLinkText(mUrlString, mTitleString, mHtmlString);
// if there is no drag node, which will be the case for a selection, just
// use the selection target node.
rv = AddStringsToDataTransfer(
dragNode ? dragNode : mSelectionTargetNode.get(), aDataTransfer);
NS_ENSURE_SUCCESS(rv, rv);
NS_IF_ADDREF(*aDragNode = dragNode);
return NS_OK;
}
void
DragDataProducer::AddString(DataTransfer* aDataTransfer,
const nsAString& aFlavor,
const nsAString& aData,
nsIPrincipal* aPrincipal)
{
RefPtr<nsVariantCC> variant = new nsVariantCC();
variant->SetAsAString(aData);
aDataTransfer->SetDataWithPrincipal(aFlavor, variant, 0, aPrincipal);
}
nsresult
DragDataProducer::AddStringsToDataTransfer(nsIContent* aDragNode,
DataTransfer* aDataTransfer)
{
NS_ASSERTION(aDragNode, "adding strings for null node");
// set all of the data to have the principal of the node where the data came from
nsIPrincipal* principal = aDragNode->NodePrincipal();
// add a special flavor if we're an anchor to indicate that we have
// a URL in the drag data
if (!mUrlString.IsEmpty() && mIsAnchor) {
nsAutoString dragData(mUrlString);
dragData.Append('\n');
// Remove leading and trailing newlines in the title and replace them with
// space in remaining positions - they confuse PlacesUtils::unwrapNodes
// that expects url\ntitle formatted data for x-moz-url.
nsAutoString title(mTitleString);
title.Trim("\r\n");
title.ReplaceChar("\r\n", ' ');
dragData += title;
AddString(aDataTransfer, NS_LITERAL_STRING(kURLMime), dragData, principal);
AddString(aDataTransfer, NS_LITERAL_STRING(kURLDataMime), mUrlString, principal);
AddString(aDataTransfer, NS_LITERAL_STRING(kURLDescriptionMime), mTitleString, principal);
AddString(aDataTransfer, NS_LITERAL_STRING("text/uri-list"), mUrlString, principal);
}
// add a special flavor for the html context data
if (!mContextString.IsEmpty())
AddString(aDataTransfer, NS_LITERAL_STRING(kHTMLContext), mContextString, principal);
// add a special flavor if we have html info data
if (!mInfoString.IsEmpty())
AddString(aDataTransfer, NS_LITERAL_STRING(kHTMLInfo), mInfoString, principal);
// add the full html
if (!mHtmlString.IsEmpty())
AddString(aDataTransfer, NS_LITERAL_STRING(kHTMLMime), mHtmlString, principal);
// add the plain text. we use the url for text/plain data if an anchor is
// being dragged, rather than the title text of the link or the alt text for
// an anchor image.
AddString(aDataTransfer, NS_LITERAL_STRING(kTextMime),
mIsAnchor ? mUrlString : mTitleString, principal);
// add image data, if present. For now, all we're going to do with
// this is turn it into a native data flavor, so indicate that with
// a new flavor so as not to confuse anyone who is really registered
// for image/gif or image/jpg.
if (mImage) {
RefPtr<nsVariantCC> variant = new nsVariantCC();
variant->SetAsISupports(mImage);
aDataTransfer->SetDataWithPrincipal(NS_LITERAL_STRING(kNativeImageMime),
variant, 0, principal);
// assume the image comes from a file, and add a file promise. We
// register ourselves as a nsIFlavorDataProvider, and will use the
// GetFlavorData callback to save the image to disk.
nsCOMPtr<nsIFlavorDataProvider> dataProvider =
new nsContentAreaDragDropDataProvider();
if (dataProvider) {
RefPtr<nsVariantCC> variant = new nsVariantCC();
variant->SetAsISupports(dataProvider);
aDataTransfer->SetDataWithPrincipal(NS_LITERAL_STRING(kFilePromiseMime),
variant, 0, principal);
}
AddString(aDataTransfer, NS_LITERAL_STRING(kFilePromiseURLMime),
mImageSourceString, principal);
AddString(aDataTransfer, NS_LITERAL_STRING(kFilePromiseDestFilename),
mImageDestFileName, principal);
// if not an anchor, add the image url
if (!mIsAnchor) {
AddString(aDataTransfer, NS_LITERAL_STRING(kURLDataMime), mUrlString, principal);
AddString(aDataTransfer, NS_LITERAL_STRING("text/uri-list"), mUrlString, principal);
}
}
return NS_OK;
}
// note that this can return NS_OK, but a null out param (by design)
// static
nsresult
DragDataProducer::GetDraggableSelectionData(nsISelection* inSelection,
nsIContent* inRealTargetNode,
nsIContent **outImageOrLinkNode,
bool* outDragSelectedText)
{
NS_ENSURE_ARG(inSelection);
NS_ENSURE_ARG(inRealTargetNode);
NS_ENSURE_ARG_POINTER(outImageOrLinkNode);
*outImageOrLinkNode = nullptr;
*outDragSelectedText = false;
bool selectionContainsTarget = false;
bool isCollapsed = false;
inSelection->GetIsCollapsed(&isCollapsed);
if (!isCollapsed) {
nsCOMPtr<nsIDOMNode> realTargetNode = do_QueryInterface(inRealTargetNode);
inSelection->ContainsNode(realTargetNode, false,
&selectionContainsTarget);
if (selectionContainsTarget) {
// track down the anchor node, if any, for the url
nsCOMPtr<nsIDOMNode> selectionStart;
inSelection->GetAnchorNode(getter_AddRefs(selectionStart));
nsCOMPtr<nsIDOMNode> selectionEnd;
inSelection->GetFocusNode(getter_AddRefs(selectionEnd));
// look for a selection around a single node, like an image.
// in this case, drag the image, rather than a serialization of the HTML
// XXX generalize this to other draggable element types?
if (selectionStart == selectionEnd) {
nsCOMPtr<nsIContent> selStartContent = do_QueryInterface(selectionStart);
if (selStartContent && selStartContent->HasChildNodes()) {
// see if just one node is selected
int32_t anchorOffset, focusOffset;
inSelection->GetAnchorOffset(&anchorOffset);
inSelection->GetFocusOffset(&focusOffset);
if (abs(anchorOffset - focusOffset) == 1) {
int32_t childOffset =
(anchorOffset < focusOffset) ? anchorOffset : focusOffset;
nsIContent *childContent =
selStartContent->GetChildAt_Deprecated(childOffset);
// if we find an image, we'll fall into the node-dragging code,
// rather the the selection-dragging code
if (nsContentUtils::IsDraggableImage(childContent)) {
NS_ADDREF(*outImageOrLinkNode = childContent);
return NS_OK;
}
}
}
}
// indicate that a link or text is selected
*outDragSelectedText = true;
}
}
return NS_OK;
}
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