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* Copyright (C) 2001 Peter Kelly (
* Copyright (C) 2001 Tobias Anton (
* Copyright (C) 2006 Samuel Weinig (
* Copyright (C) 2003, 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
#ifndef DataTransfer_h
#define DataTransfer_h
#include "bindings/core/v8/ScriptWrappable.h"
#include "core/CoreExport.h"
#include "core/clipboard/DataTransferAccessPolicy.h"
#include "core/loader/resource/ImageResourceContent.h"
#include "core/page/DragActions.h"
#include "platform/geometry/IntPoint.h"
#include "platform/heap/Handle.h"
#include "wtf/Forward.h"
#include <memory>
namespace blink {
class DataObject;
class DataTransferItemList;
class DragImage;
class Element;
class FileList;
class FrameSelection;
class LocalFrame;
class Node;
// Used for drag and drop and copy/paste.
// Drag and Drop:
// Clipboard API (copy/paste):
class CORE_EXPORT DataTransfer final
: public GarbageCollectedFinalized<DataTransfer>,
public ScriptWrappable {
// Whether this transfer is serving a drag-drop, copy-paste, spellcheck,
// auto-correct or similar request.
enum DataTransferType {
static DataTransfer* create(DataTransferType,
bool isForCopyAndPaste() const { return m_transferType == CopyAndPaste; }
bool isForDragAndDrop() const { return m_transferType == DragAndDrop; }
String dropEffect() const {
return dropEffectIsUninitialized() ? "none" : m_dropEffect;
void setDropEffect(const String&);
bool dropEffectIsUninitialized() const {
return m_dropEffect == "uninitialized";
String effectAllowed() const { return m_effectAllowed; }
void setEffectAllowed(const String&);
void clearData(const String& type = String());
String getData(const String& type) const;
void setData(const String& type, const String& data);
// extensions beyond IE's API
Vector<String> types() const;
FileList* files() const;
IntPoint dragLocation() const { return m_dragLoc; }
void setDragImage(Element*, int x, int y);
void clearDragImage();
void setDragImageResource(ImageResourceContent*, const IntPoint&);
void setDragImageElement(Node*, const IntPoint&);
std::unique_ptr<DragImage> createDragImage(IntPoint& dragLocation,
LocalFrame*) const;
void declareAndWriteDragImage(Element*,
const KURL& linkURL,
const KURL& imageURL,
const String& title);
void writeURL(Node*, const KURL&, const String&);
void writeSelection(const FrameSelection&);
void setAccessPolicy(DataTransferAccessPolicy);
bool canReadTypes() const;
bool canReadData() const;
bool canWriteData() const;
// Note that the spec doesn't actually allow drag image modification outside
// the dragstart event. This capability is maintained for backwards
// compatiblity for ports that have supported this in the past. On many ports,
// attempting to set a drag image outside the dragstart operation is a no-op
// anyway.
bool canSetDragImage() const;
DragOperation sourceOperation() const;
DragOperation destinationOperation() const;
void setSourceOperation(DragOperation);
void setDestinationOperation(DragOperation);
bool hasDropZoneType(const String&);
DataTransferItemList* items();
DataObject* dataObject() const;
DataTransfer(DataTransferType, DataTransferAccessPolicy, DataObject*);
void setDragImage(ImageResourceContent*, Node*, const IntPoint&);
bool hasFileOfType(const String&) const;
bool hasStringOfType(const String&) const;
// Instead of using this member directly, prefer to use the can*() methods
// above.
DataTransferAccessPolicy m_policy;
String m_dropEffect;
String m_effectAllowed;
DataTransferType m_transferType;
Member<DataObject> m_dataObject;
IntPoint m_dragLoc;
Member<ImageResourceContent> m_dragImage;
Member<Node> m_dragImageElement;
DragOperation convertDropZoneOperationToDragOperation(
const String& dragOperation);
String convertDragOperationToDropZoneOperation(DragOperation);
} // namespace blink
#endif // DataTransfer_h