gecko-dev/dom/events/DataTransfer.h

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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/. */
#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 "nsAutoPtr.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/Promise.h"
class nsINode;
class nsITransferable;
class nsISupportsArray;
class nsILoadContext;
namespace mozilla {
class EventStateManager;
namespace dom {
class DOMStringList;
class Element;
class FileList;
template<typename T> class Optional;
/**
* TransferItem is used to hold data for a particular format. Each piece of
* data has a principal set from the caller which added it. This allows a
* caller that wishes to retrieve the data to only be able to access the data
* it is allowed to, yet still allow a chrome caller to retrieve any of the
* data.
*/
struct TransferItem {
nsString mFormat;
nsCOMPtr<nsIPrincipal> mPrincipal;
nsCOMPtr<nsIVariant> mData;
};
#define NS_DATATRANSFER_IID \
{ 0x43ee0327, 0xde5d, 0x463d, \
{ 0x9b, 0xd0, 0xf1, 0x79, 0x09, 0x69, 0xf2, 0xfb } }
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;
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.
DataTransfer(nsISupports* aParent,
uint32_t aEventType,
const uint32_t aEffectAllowed,
bool aCursorState,
bool aIsExternal,
bool aUserCancelled,
bool aIsCrossDomainSubFrameDrop,
int32_t aClipboardType,
nsTArray<nsTArray<TransferItem> >& aItems,
Element* aDragImage,
uint32_t aDragImageX,
uint32_t aDragImageY);
~DataTransfer();
static const char sEffects[8][9];
public:
// Constructor for DataTransfer.
//
// aEventType is an event constant (such as NS_DRAGDROP_START)
//
// 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, uint32_t aEventType, bool aIsExternal,
int32_t aClipboardType);
virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
nsISupports* GetParentObject()
{
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,
ErrorResult& aRv);
already_AddRefed<DOMStringList> Types();
void GetData(const nsAString& aFormat, nsAString& aData, ErrorResult& aRv);
void SetData(const nsAString& aFormat, const nsAString& aData,
ErrorResult& aRv);
void ClearData(const mozilla::dom::Optional<nsAString>& aFormat,
mozilla::ErrorResult& aRv);
FileList* GetFiles(mozilla::ErrorResult& aRv);
already_AddRefed<Promise> GetFilesAndDirectories(ErrorResult& aRv);
void AddElement(Element& aElement, mozilla::ErrorResult& aRv);
uint32_t MozItemCount()
{
return mItems.Length();
}
void GetMozCursor(nsString& aCursor)
{
if (mCursorState) {
aCursor.AssignLiteral("default");
} else {
aCursor.AssignLiteral("auto");
}
}
already_AddRefed<DOMStringList> MozTypesAt(uint32_t aIndex,
mozilla::ErrorResult& aRv);
void MozClearDataAt(const nsAString& aFormat, uint32_t aIndex,
mozilla::ErrorResult& aRv);
void MozSetDataAt(JSContext* aCx, const nsAString& aFormat,
JS::Handle<JS::Value> aData, uint32_t aIndex,
mozilla::ErrorResult& aRv);
void MozGetDataAt(JSContext* aCx, const nsAString& aFormat,
uint32_t aIndex, JS::MutableHandle<JS::Value> aRetval,
mozilla::ErrorResult& aRv);
bool MozUserCancelled()
{
return mUserCancelled;
}
already_AddRefed<nsINode> GetMozSourceNode();
mozilla::dom::Element* GetDragTarget()
{
return mDragTarget;
}
// a readonly dataTransfer cannot have new data added or existing data removed.
// Only the dropEffect and effectAllowed may be modified.
void SetReadOnly() { mReadOnly = true; }
// converts the data into an array of nsITransferable objects to be used for
// drag and drop or clipboard operations.
already_AddRefed<nsISupportsArray> GetTransferables(nsIDOMNode* aDragTarget);
already_AddRefed<nsISupportsArray> 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);
// 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);
// returns a weak reference to the drag image
Element* GetDragImage(int32_t* aX, int32_t* aY)
{
*aX = mDragImageX;
*aY = mDragImageY;
return mDragImage;
}
nsresult Clone(nsISupports* aParent, uint32_t aEventType, bool aUserCancelled,
bool aIsCrossDomainSubFrameDrop, DataTransfer** aResult);
protected:
// 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);
// caches text and uri-list data formats that exist in the drag service or
// clipboard for retrieval later.
void CacheExternalData(const char* aFormat, uint32_t aIndex, nsIPrincipal* aPrincipal);
// 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();
// fills in the data field of aItem with the data from the drag service or
// clipboard for a given index.
void FillInExternalData(TransferItem& aItem, uint32_t aIndex);
friend class ContentParent;
void FillAllExternalData();
void MozClearDataAtHelper(const nsAString& aFormat, uint32_t aIndex,
mozilla::ErrorResult& aRv);
nsCOMPtr<nsISupports> mParent;
// the event type this data transfer is for. This will correspond to an
// event->message value.
uint32_t mEventType;
// the drop effect and effect allowed
uint32_t mDropEffect;
uint32_t mEffectAllowed;
// Indicates the behavior of the cursor during drag operations
bool mCursorState;
// readonly data transfers may not be modified except the drop effect and
// effect allowed.
bool mReadOnly;
// 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;
// array of items, each containing an array of format->data pairs
nsTArray<nsTArray<TransferItem> > mItems;
// array of files, containing only the files present in the dataTransfer
nsRefPtr<FileList> mFiles;
// 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 */