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174 lines
3.3 KiB
C++
174 lines
3.3 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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#include "IEnumFE.h"
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#include "nsAlgorithm.h"
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#include <algorithm>
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CEnumFormatEtc::CEnumFormatEtc() :
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mRefCnt(0),
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mCurrentIdx(0)
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{
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}
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// Constructor used by Clone()
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CEnumFormatEtc::CEnumFormatEtc(nsTArray<FormatEtc>& aArray) :
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mRefCnt(0),
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mCurrentIdx(0)
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{
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// a deep copy, calls FormatEtc's copy constructor on each
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mFormatList.AppendElements(aArray);
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}
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CEnumFormatEtc::~CEnumFormatEtc()
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{
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}
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/* IUnknown impl. */
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STDMETHODIMP
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CEnumFormatEtc::QueryInterface(REFIID riid, LPVOID *ppv)
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{
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*ppv = nullptr;
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if (IsEqualIID(riid, IID_IUnknown) ||
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IsEqualIID(riid, IID_IEnumFORMATETC))
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*ppv = (LPVOID)this;
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if (*ppv == nullptr)
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return E_NOINTERFACE;
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// AddRef any interface we'll return.
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((LPUNKNOWN)*ppv)->AddRef();
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return S_OK;
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}
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STDMETHODIMP_(ULONG)
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CEnumFormatEtc::AddRef()
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{
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++mRefCnt;
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NS_LOG_ADDREF(this, mRefCnt, "CEnumFormatEtc",sizeof(*this));
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return mRefCnt;
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}
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STDMETHODIMP_(ULONG)
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CEnumFormatEtc::Release()
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{
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uint32_t refReturn;
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refReturn = --mRefCnt;
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NS_LOG_RELEASE(this, mRefCnt, "CEnumFormatEtc");
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if (mRefCnt == 0)
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delete this;
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return refReturn;
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}
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/* IEnumFORMATETC impl. */
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STDMETHODIMP
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CEnumFormatEtc::Next(ULONG aMaxToFetch, FORMATETC *aResult, ULONG *aNumFetched)
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{
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// If the method retrieves the number of items requested, the return
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// value is S_OK. Otherwise, it is S_FALSE.
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if (aNumFetched)
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*aNumFetched = 0;
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// aNumFetched can be null if aMaxToFetch is 1
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if (!aNumFetched && aMaxToFetch > 1)
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return S_FALSE;
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if (!aResult)
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return S_FALSE;
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// We're done walking the list
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if (mCurrentIdx >= mFormatList.Length())
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return S_FALSE;
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uint32_t left = mFormatList.Length() - mCurrentIdx;
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if (!aMaxToFetch)
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return S_FALSE;
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uint32_t count = std::min(static_cast<uint32_t>(aMaxToFetch), left);
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uint32_t idx = 0;
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while (count > 0) {
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// Copy out to aResult
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mFormatList[mCurrentIdx++].CopyOut(&aResult[idx++]);
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count--;
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}
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if (aNumFetched)
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*aNumFetched = idx;
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return S_OK;
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}
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STDMETHODIMP
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CEnumFormatEtc::Skip(ULONG aSkipNum)
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{
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// If the method skips the number of items requested, the return value is S_OK.
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// Otherwise, it is S_FALSE.
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if ((mCurrentIdx + aSkipNum) >= mFormatList.Length())
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return S_FALSE;
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mCurrentIdx += aSkipNum;
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return S_OK;
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}
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STDMETHODIMP
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CEnumFormatEtc::Reset(void)
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{
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mCurrentIdx = 0;
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return S_OK;
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}
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STDMETHODIMP
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CEnumFormatEtc::Clone(LPENUMFORMATETC *aResult)
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{
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// Must return a new IEnumFORMATETC interface with the same iterative state.
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if (!aResult)
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return E_INVALIDARG;
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CEnumFormatEtc * pEnumObj = new CEnumFormatEtc(mFormatList);
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if (!pEnumObj)
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return E_OUTOFMEMORY;
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pEnumObj->AddRef();
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pEnumObj->SetIndex(mCurrentIdx);
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*aResult = pEnumObj;
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return S_OK;
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}
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/* utils */
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void
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CEnumFormatEtc::AddFormatEtc(LPFORMATETC aFormat)
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{
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if (!aFormat)
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return;
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FormatEtc * etc = mFormatList.AppendElement();
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// Make a copy of aFormat
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if (etc)
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etc->CopyIn(aFormat);
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}
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/* private */
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void
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CEnumFormatEtc::SetIndex(uint32_t aIdx)
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{
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mCurrentIdx = aIdx;
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}
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