/* -*- 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/. */
#ifndef mozilla_dom_DataTransfer_h
#define mozilla_dom_DataTransfer_h
#include "nsString.h"
#include "nsTArray.h"
#include "nsIVariant.h"
#include "nsIPrincipal.h"
#include "nsIDOMDataTransfer.h"
#include "nsIDOMElement.h"
#include "nsIDragService.h"
#include "nsCycleCollectionParticipant.h"
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/File.h"
class nsINode;
class nsITransferable;
class nsILoadContext;
namespace mozilla {
class EventStateManager;
namespace dom {
class DataTransferItem;
class DataTransferItemList;
class DOMStringList;
class Element;
class FileList;
class Promise;
template <typename T>
class Optional;
#define NS_DATATRANSFER_IID \
{ \
0x6c5f90d1, 0xa886, 0x42c8, { \
0x85, 0x06, 0x10, 0xbe, 0x5c, 0x0d, 0xc6, 0x77 \
} \
}
class DataTransfer final : public nsIDOMDataTransfer, public nsWrapperCache {
public:
NS_DECLARE_STATIC_IID_ACCESSOR(NS_DATATRANSFER_IID)
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_NSIDOMDATATRANSFER
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DataTransfer)
friend class mozilla::EventStateManager;
static DataTransfer* Cast(nsIDOMDataTransfer* aArg) {
return static_cast<DataTransfer*>(aArg);
}
/// An enum which represents which "Drag Data Store Mode" the DataTransfer is
/// in according to the spec.
enum class Mode : uint8_t {
ReadWrite,
ReadOnly,
Protected,
};
protected:
// hide the default constructor
DataTransfer();
// this constructor is used only by the Clone method to copy the fields as
// needed to a new data transfer.
// NOTE: Do not call this method directly.
DataTransfer(nsISupports* aParent, EventMessage aEventMessage,
const uint32_t aEffectAllowed, bool aCursorState,
bool aIsExternal, bool aUserCancelled,
bool aIsCrossDomainSubFrameDrop, int32_t aClipboardType,
DataTransferItemList* aItems, Element* aDragImage,
uint32_t aDragImageX, uint32_t aDragImageY);
~DataTransfer();
static const char sEffects[8][9];
public:
// Constructor for DataTransfer.
//
// aIsExternal must only be true when used to create a dataTransfer for a
// paste or a drag that was started without using a data transfer. The
// latter will occur when an external drag occurs, that is, a drag where the
// source is another application, or a drag is started by calling the drag
// service directly. For clipboard operations, aClipboardType indicates
// which clipboard to use, from nsIClipboard, or -1 for non-clipboard
// operations, or if access to the system clipboard should not be allowed.
DataTransfer(nsISupports* aParent, EventMessage aEventMessage,
bool aIsExternal, int32_t aClipboardType);
virtual JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
nsISupports* GetParentObject() const { return mParent; }
void SetParentObject(nsISupports* aNewParent) {
MOZ_ASSERT(aNewParent);
// Setting the parent after we've been wrapped is pointless, so
// make sure we aren't wrapped yet.
MOZ_ASSERT(!GetWrapperPreserveColor());
mParent = aNewParent;
}
static already_AddRefed<DataTransfer> Constructor(const GlobalObject& aGlobal,
const nsAString& aEventType,
bool aIsExternal,
ErrorResult& aRv);
void GetDropEffect(nsString& aDropEffect) {
aDropEffect.AssignASCII(sEffects[mDropEffect]);
}
void GetEffectAllowed(nsString& aEffectAllowed) {
if (mEffectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED) {
aEffectAllowed.AssignLiteral("uninitialized");
} else {
aEffectAllowed.AssignASCII(sEffects[mEffectAllowed]);
}
}
void SetDragImage(Element& aElement, int32_t aX, int32_t aY);
void UpdateDragImage(Element& aElement, int32_t aX, int32_t aY);
void GetTypes(nsTArray<nsString>& aTypes, CallerType aCallerType) const;
void GetData(const nsAString& aFormat, nsAString& aData,
nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv);
void SetData(const nsAString& aFormat, const nsAString& aData,
nsIPrincipal& aSubjectPrincipal, ErrorResult& aRv);
void ClearData(const mozilla::dom::Optional<nsAString>& aFormat,
nsIPrincipal& aSubjectPrincipal, mozilla::ErrorResult& aRv);
already_AddRefed<FileList> GetFiles(nsIPrincipal& aSubjectPrincipal,
mozilla::ErrorResult& aRv);
already_AddRefed<Promise> GetFilesAndDirectories(
nsIPrincipal& aSubjectPrincipal, mozilla::ErrorResult& aRv);
already_AddRefed<Promise> GetFiles(bool aRecursiveFlag,
nsIPrincipal& aSubjectPrincipal,
ErrorResult& aRv);
void AddElement(Element& aElement, mozilla::ErrorResult& aRv);
uint32_t MozItemCount() const;
void GetMozCursor(nsString& aCursor) {
if (mCursorState) {
aCursor.AssignLiteral("default");
} else {
aCursor.AssignLiteral("auto");
}
}
already_AddRefed<DOMStringList> MozTypesAt(uint32_t aIndex,
CallerType aCallerType,
mozilla::ErrorResult& aRv) const;
void MozClearDataAt(const nsAString& aFormat, uint32_t aIndex,
nsIPrincipal& aSubjectPrincipal,
mozilla::ErrorResult& aRv);
void MozSetDataAt(JSContext* aCx, const nsAString& aFormat,
JS::Handle<JS::Value> aData, uint32_t aIndex,
nsIPrincipal& aSubjectPrincipal, mozilla::ErrorResult& aRv);
void MozGetDataAt(JSContext* aCx, const nsAString& aFormat, uint32_t aIndex,
JS::MutableHandle<JS::Value> aRetval,
nsIPrincipal& aSubjectPrincipal, mozilla::ErrorResult& aRv);
bool MozUserCancelled() const { return mUserCancelled; }
already_AddRefed<nsINode> GetMozSourceNode();
void GetMozTriggeringPrincipalURISpec(nsAString& aPrincipalURISpec);
mozilla::dom::Element* GetDragTarget() const { return mDragTarget; }
nsresult GetDataAtNoSecurityCheck(const nsAString& aFormat, uint32_t aIndex,
nsIVariant** aData);
DataTransferItemList* Items() const { return mItems; }
// Returns the current "Drag Data Store Mode" of the DataTransfer. This
// determines what modifications may be performed on the DataTransfer, and
// what data may be read from it.
Mode GetMode() const { return mMode; }
void SetMode(Mode aMode);
// Helper method. Is true if the DataTransfer's mode is ReadOnly or Protected,
// which means that the DataTransfer cannot be modified.
bool IsReadOnly() const { return mMode != Mode::ReadWrite; }
// Helper method. Is true if the DataTransfer's mode is Protected, which means
// that DataTransfer type information may be read, but data may not be.
bool IsProtected() const { return mMode == Mode::Protected; }
int32_t ClipboardType() const { return mClipboardType; }
EventMessage GetEventMessage() const { return mEventMessage; }
bool IsCrossDomainSubFrameDrop() const { return mIsCrossDomainSubFrameDrop; }
// converts the data into an array of nsITransferable objects to be used for
// drag and drop or clipboard operations.
already_AddRefed<nsIArray> GetTransferables(nsIDOMNode* aDragTarget);
already_AddRefed<nsIArray> GetTransferables(nsILoadContext* aLoadContext);
// converts the data for a single item at aIndex into an nsITransferable
// object.
already_AddRefed<nsITransferable> GetTransferable(
uint32_t aIndex, nsILoadContext* aLoadContext);
// converts the data in the variant to an nsISupportString if possible or
// an nsISupports or null otherwise.
bool ConvertFromVariant(nsIVariant* aVariant, nsISupports** aSupports,
uint32_t* aLength) const;
// Disconnects the DataTransfer from the Drag Data Store. If the
// dom.dataTransfer.disconnect pref is enabled, this will clear the
// DataTransfer and set it to the `Protected` state, otherwise this method is
// a no-op.
void Disconnect();
// clears all of the data
void ClearAll();
// Similar to SetData except also specifies the principal to store.
// aData may be null when called from CacheExternalDragFormats or
// CacheExternalClipboardFormats.
nsresult SetDataWithPrincipal(const nsAString& aFormat, nsIVariant* aData,
uint32_t aIndex, nsIPrincipal* aPrincipal,
bool aHidden = false);
// Variation of SetDataWithPrincipal with handles extracting
// kCustomTypesMime data into separate types.
void SetDataWithPrincipalFromOtherProcess(const nsAString& aFormat,
nsIVariant* aData, uint32_t aIndex,
nsIPrincipal* aPrincipal,
bool aHidden);
// returns a weak reference to the drag image
Element* GetDragImage(int32_t* aX, int32_t* aY) const {
*aX = mDragImageX;
*aY = mDragImageY;
return mDragImage;
}
// This method makes a copy of the DataTransfer object, with a few properties
// changed, and the mode updated to reflect the correct mode for the given
// event. This method is used during the drag operation to generate the
// DataTransfer objects for each event after `dragstart`. Event objects will
// lazily clone the DataTransfer stored in the DragSession (which is a clone
// of the DataTransfer used in the `dragstart` event) when requested.
nsresult Clone(nsISupports* aParent, EventMessage aEventMessage,
bool aUserCancelled, bool aIsCrossDomainSubFrameDrop,
DataTransfer** aResult);
// converts some formats used for compatibility in aInFormat into aOutFormat.
// Text and text/unicode become text/plain, and URL becomes text/uri-list
void GetRealFormat(const nsAString& aInFormat, nsAString& aOutFormat) const;
static bool PrincipalMaySetData(const nsAString& aFormat, nsIVariant* aData,
nsIPrincipal* aPrincipal);
// Notify the DataTransfer that the list returned from GetTypes may have
// changed. This can happen due to items we care about for purposes of
// GetTypes being added or removed or changing item kinds.
void TypesListMayHaveChanged();
// Testing method used to emulate internal DataTransfer management.
// NOTE: Please don't use this. See the comments in the webidl for more.
already_AddRefed<DataTransfer> MozCloneForEvent(const nsAString& aEvent,
ErrorResult& aRv);
protected:
// caches text and uri-list data formats that exist in the drag service or
// clipboard for retrieval later.
nsresult CacheExternalData(const char* aFormat, uint32_t aIndex,
nsIPrincipal* aPrincipal, bool aHidden);
// caches the formats that exist in the drag service that were added by an
// external drag
void CacheExternalDragFormats();
// caches the formats that exist in the clipboard
void CacheExternalClipboardFormats(bool aPlainTextOnly);
FileList* GetFilesInternal(ErrorResult& aRv, nsIPrincipal* aSubjectPrincipal);
nsresult GetDataAtInternal(const nsAString& aFormat, uint32_t aIndex,
nsIPrincipal* aSubjectPrincipal,
nsIVariant** aData);
nsresult SetDataAtInternal(const nsAString& aFormat, nsIVariant* aData,
uint32_t aIndex, nsIPrincipal* aSubjectPrincipal);
friend class ContentParent;
void FillAllExternalData();
void FillInExternalCustomTypes(uint32_t aIndex, nsIPrincipal* aPrincipal);
void FillInExternalCustomTypes(nsIVariant* aData, uint32_t aIndex,
nsIPrincipal* aPrincipal);
void MozClearDataAtHelper(const nsAString& aFormat, uint32_t aIndex,
nsIPrincipal& aSubjectPrincipal,
mozilla::ErrorResult& aRv);
nsCOMPtr<nsISupports> mParent;
// the drop effect and effect allowed
uint32_t mDropEffect;
uint32_t mEffectAllowed;
// the event message this data transfer is for. This will correspond to an
// event->mMessage value.
EventMessage mEventMessage;
// Indicates the behavior of the cursor during drag operations
bool mCursorState;
// The current "Drag Data Store Mode" which the DataTransfer is in.
Mode mMode;
// true for drags started without a data transfer, for example, those from
// another application.
bool mIsExternal;
// true if the user cancelled the drag. Used only for the dragend event.
bool mUserCancelled;
// true if this is a cross-domain drop from a subframe where access to the
// data should be prevented
bool mIsCrossDomainSubFrameDrop;
// Indicates which clipboard type to use for clipboard operations. Ignored for
// drag and drop.
int32_t mClipboardType;
// The items contained with the DataTransfer
RefPtr<DataTransferItemList> mItems;
// the target of the drag. The drag and dragend events will fire at this.
nsCOMPtr<mozilla::dom::Element> mDragTarget;
// the custom drag image and coordinates within the image. If mDragImage is
// null, the default image is created from the drag target.
nsCOMPtr<mozilla::dom::Element> mDragImage;
uint32_t mDragImageX;
uint32_t mDragImageY;
};
NS_DEFINE_STATIC_IID_ACCESSOR(DataTransfer, NS_DATATRANSFER_IID)
} // namespace dom
} // namespace mozilla
#endif /* mozilla_dom_DataTransfer_h */