gecko-dev/widget/windows/IEnumFE.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
* Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Jim Mathies <jmathies@mozilla.com>
*
* 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
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef IEnumeFE_h__
#define IEnumeFE_h__
/*
* CEnumFormatEtc - implements IEnumFORMATETC
*/
#include <ole2.h>
#include "nsTArray.h"
// FORMATETC container
class FormatEtc
{
public:
FormatEtc() { memset(&mFormat, 0, sizeof(FORMATETC)); }
FormatEtc(const FormatEtc& copy) { CopyIn(&copy.mFormat); }
~FormatEtc() { if (mFormat.ptd) CoTaskMemFree(mFormat.ptd); }
void CopyIn(const FORMATETC *aSrc) {
if (!aSrc) {
memset(&mFormat, 0, sizeof(FORMATETC));
return;
}
mFormat = *aSrc;
if (aSrc->ptd) {
mFormat.ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
*(mFormat.ptd) = *(aSrc->ptd);
}
}
void CopyOut(LPFORMATETC aDest) {
if (!aDest)
return;
*aDest = mFormat;
if (mFormat.ptd) {
aDest->ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
*(aDest->ptd) = *(mFormat.ptd);
}
}
private:
FORMATETC mFormat;
};
/*
* CEnumFormatEtc is created within IDataObject::EnumFormatEtc. This object lives
* on its own, that is, QueryInterface only knows IUnknown and IEnumFormatEtc,
* nothing more. We still use an outer unknown for reference counting, because as
* long as this enumerator lives, the data object should live, thereby keeping the
* application up.
*/
class CEnumFormatEtc : public IEnumFORMATETC
{
public:
CEnumFormatEtc(nsTArray<FormatEtc>& aArray);
CEnumFormatEtc();
~CEnumFormatEtc();
// IUnknown impl.
STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppv);
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP_(ULONG) Release();
// IEnumFORMATETC impl.
STDMETHODIMP Next(ULONG aMaxToFetch, FORMATETC *aResult, ULONG *aNumFetched);
STDMETHODIMP Skip(ULONG aSkipNum);
STDMETHODIMP Reset();
STDMETHODIMP Clone(LPENUMFORMATETC *aResult); // Addrefs
// Utils
void AddFormatEtc(LPFORMATETC aFormat);
private:
nsTArray<FormatEtc> mFormatList; // Formats
ULONG mRefCnt; // Object reference count
ULONG mCurrentIdx; // Current element
void SetIndex(PRUint32 aIdx);
};
#endif //_IENUMFE_H_