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90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef IEnumeFE_h__
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#define IEnumeFE_h__
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/*
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* CEnumFormatEtc - implements IEnumFORMATETC
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*/
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#include <ole2.h>
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#include "nsTArray.h"
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// FORMATETC container
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class FormatEtc
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{
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public:
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FormatEtc() { memset(&mFormat, 0, sizeof(FORMATETC)); }
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FormatEtc(const FormatEtc& copy) { CopyIn(©.mFormat); }
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~FormatEtc() { if (mFormat.ptd) CoTaskMemFree(mFormat.ptd); }
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void CopyIn(const FORMATETC *aSrc) {
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if (!aSrc) {
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memset(&mFormat, 0, sizeof(FORMATETC));
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return;
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}
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mFormat = *aSrc;
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if (aSrc->ptd) {
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mFormat.ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
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*(mFormat.ptd) = *(aSrc->ptd);
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}
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}
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void CopyOut(LPFORMATETC aDest) {
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if (!aDest)
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return;
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*aDest = mFormat;
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if (mFormat.ptd) {
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aDest->ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
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*(aDest->ptd) = *(mFormat.ptd);
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}
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}
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private:
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FORMATETC mFormat;
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};
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/*
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* CEnumFormatEtc is created within IDataObject::EnumFormatEtc. This object lives
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* on its own, that is, QueryInterface only knows IUnknown and IEnumFormatEtc,
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* nothing more. We still use an outer unknown for reference counting, because as
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* long as this enumerator lives, the data object should live, thereby keeping the
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* application up.
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*/
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class CEnumFormatEtc : public IEnumFORMATETC
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{
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public:
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CEnumFormatEtc(nsTArray<FormatEtc>& aArray);
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CEnumFormatEtc();
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~CEnumFormatEtc();
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// IUnknown impl.
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STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppv);
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STDMETHODIMP_(ULONG) AddRef();
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STDMETHODIMP_(ULONG) Release();
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// IEnumFORMATETC impl.
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STDMETHODIMP Next(ULONG aMaxToFetch, FORMATETC *aResult, ULONG *aNumFetched);
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STDMETHODIMP Skip(ULONG aSkipNum);
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STDMETHODIMP Reset();
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STDMETHODIMP Clone(LPENUMFORMATETC *aResult); // Addrefs
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// Utils
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void AddFormatEtc(LPFORMATETC aFormat);
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private:
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nsTArray<FormatEtc> mFormatList; // Formats
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ULONG mRefCnt; // Object reference count
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ULONG mCurrentIdx; // Current element
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void SetIndex(PRUint32 aIdx);
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};
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#endif //_IENUMFE_H_
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