From baad25e39733dfc3dd310198fdcced00ffbef68b Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Tue, 23 Nov 2021 00:13:32 -0500
Subject: Issue %3005 - Move widget/ to system/interface

---
 system/interface/windows/IEnumFE.cpp | 173 +++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 system/interface/windows/IEnumFE.cpp

(limited to 'system/interface/windows/IEnumFE.cpp')

diff --git a/system/interface/windows/IEnumFE.cpp b/system/interface/windows/IEnumFE.cpp
new file mode 100644
index 000000000..4fa76258b
--- /dev/null
+++ b/system/interface/windows/IEnumFE.cpp
@@ -0,0 +1,173 @@
+/* -*- 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;
+}
-- 
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