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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /widget/windows/IEnumFE.cpp | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'widget/windows/IEnumFE.cpp')
-rw-r--r-- | widget/windows/IEnumFE.cpp | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/widget/windows/IEnumFE.cpp b/widget/windows/IEnumFE.cpp new file mode 100644 index 0000000000..8fe7138609 --- /dev/null +++ b/widget/windows/IEnumFE.cpp @@ -0,0 +1,139 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "IEnumFE.h" +#include "nsAlgorithm.h" +#include <algorithm> + +CEnumFormatEtc::CEnumFormatEtc() : mRefCnt(0), mCurrentIdx(0) {} + +// Constructor used by Clone() +CEnumFormatEtc::CEnumFormatEtc(nsTArray<FormatEtc>& aArray) + : mRefCnt(0), mCurrentIdx(0) { + // a deep copy, calls FormatEtc's copy constructor on each + mFormatList.AppendElements(aArray); +} + +CEnumFormatEtc::~CEnumFormatEtc() {} + +/* IUnknown impl. */ + +STDMETHODIMP +CEnumFormatEtc::QueryInterface(REFIID riid, LPVOID* ppv) { + *ppv = nullptr; + + if (IsEqualIID(riid, IID_IUnknown) || IsEqualIID(riid, IID_IEnumFORMATETC)) + *ppv = (LPVOID)this; + + if (*ppv == nullptr) return E_NOINTERFACE; + + // AddRef any interface we'll return. + ((LPUNKNOWN)*ppv)->AddRef(); + return S_OK; +} + +STDMETHODIMP_(ULONG) +CEnumFormatEtc::AddRef() { + ++mRefCnt; + NS_LOG_ADDREF(this, mRefCnt, "CEnumFormatEtc", sizeof(*this)); + return mRefCnt; +} + +STDMETHODIMP_(ULONG) +CEnumFormatEtc::Release() { + uint32_t refReturn; + + refReturn = --mRefCnt; + NS_LOG_RELEASE(this, mRefCnt, "CEnumFormatEtc"); + + if (mRefCnt == 0) delete this; + + return refReturn; +} + +/* IEnumFORMATETC impl. */ + +STDMETHODIMP +CEnumFormatEtc::Next(ULONG aMaxToFetch, FORMATETC* aResult, + ULONG* aNumFetched) { + // If the method retrieves the number of items requested, the return + // value is S_OK. Otherwise, it is S_FALSE. + + if (aNumFetched) *aNumFetched = 0; + + // aNumFetched can be null if aMaxToFetch is 1 + if (!aNumFetched && aMaxToFetch > 1) return S_FALSE; + + if (!aResult) return S_FALSE; + + // We're done walking the list + if (mCurrentIdx >= mFormatList.Length()) return S_FALSE; + + uint32_t left = mFormatList.Length() - mCurrentIdx; + + if (!aMaxToFetch) return S_FALSE; + + uint32_t count = std::min(static_cast<uint32_t>(aMaxToFetch), left); + + uint32_t idx = 0; + while (count > 0) { + // Copy out to aResult + mFormatList[mCurrentIdx++].CopyOut(&aResult[idx++]); + count--; + } + + if (aNumFetched) *aNumFetched = idx; + + return S_OK; +} + +STDMETHODIMP +CEnumFormatEtc::Skip(ULONG aSkipNum) { + // If the method skips the number of items requested, the return value is + // S_OK. Otherwise, it is S_FALSE. + + if ((mCurrentIdx + aSkipNum) >= mFormatList.Length()) return S_FALSE; + + mCurrentIdx += aSkipNum; + + return S_OK; +} + +STDMETHODIMP +CEnumFormatEtc::Reset(void) { + mCurrentIdx = 0; + return S_OK; +} + +STDMETHODIMP +CEnumFormatEtc::Clone(LPENUMFORMATETC* aResult) { + // Must return a new IEnumFORMATETC interface with the same iterative state. + + if (!aResult) return E_INVALIDARG; + + CEnumFormatEtc* pEnumObj = new CEnumFormatEtc(mFormatList); + + if (!pEnumObj) return E_OUTOFMEMORY; + + pEnumObj->AddRef(); + pEnumObj->SetIndex(mCurrentIdx); + + *aResult = pEnumObj; + + return S_OK; +} + +/* utils */ + +void CEnumFormatEtc::AddFormatEtc(LPFORMATETC aFormat) { + if (!aFormat) return; + FormatEtc* etc = mFormatList.AppendElement(); + // Make a copy of aFormat + if (etc) etc->CopyIn(aFormat); +} + +/* private */ + +void CEnumFormatEtc::SetIndex(uint32_t aIdx) { mCurrentIdx = aIdx; } |