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-rw-r--r--widget/windows/IEnumFE.cpp139
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; }