pjs/widget/xpwidgets/nsTransferable.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* ***** END LICENSE BLOCK ***** */
#ifndef nsTransferable_h__
#define nsTransferable_h__
#include "nsIFormatConverter.h"
#include "nsITransferable.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsTArray.h"
class nsString;
class nsDataObj;
//
// DataStruct
//
// Holds a flavor (a mime type) that describes the data and the associated data.
//
struct DataStruct
{
DataStruct ( const char* aFlavor )
: mDataLen(0), mFlavor(aFlavor), mCacheFileName(nsnull) { }
~DataStruct();
const nsCString& GetFlavor() const { return mFlavor; }
void SetData( nsISupports* inData, PRUint32 inDataLen );
void GetData( nsISupports** outData, PRUint32 *outDataLen );
nsIFile * GetFileSpec(const char * aFileName);
bool IsDataAvailable() const { return (mData && mDataLen > 0) || (!mData && mCacheFileName); }
protected:
enum {
// The size of data over which we write the data to disk rather than
// keep it around in memory.
kLargeDatasetSize = 1000000 // 1 million bytes
};
nsresult WriteCache(nsISupports* aData, PRUint32 aDataLen );
nsresult ReadCache(nsISupports** aData, PRUint32* aDataLen );
nsCOMPtr<nsISupports> mData; // OWNER - some varient of primitive wrapper
PRUint32 mDataLen;
const nsCString mFlavor;
char * mCacheFileName;
};
/**
* XP Transferable wrapper
*/
class nsTransferable : public nsITransferable
{
public:
nsTransferable();
virtual ~nsTransferable();
// nsISupports
NS_DECL_ISUPPORTS
NS_DECL_NSITRANSFERABLE
protected:
// get flavors w/out converter
nsresult GetTransferDataFlavors(nsISupportsArray** aDataFlavorList);
nsTArray<DataStruct> mDataArray;
nsCOMPtr<nsIFormatConverter> mFormatConv;
};
#endif // nsTransferable_h__