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-rw-r--r--widget/windows/IEnumFE.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/widget/windows/IEnumFE.h b/widget/windows/IEnumFE.h
new file mode 100644
index 0000000000..b8cb6ad9d0
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+++ b/widget/windows/IEnumFE.h
@@ -0,0 +1,88 @@
+/* -*- 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/. */
+
+#ifndef IEnumeFE_h__
+#define IEnumeFE_h__
+
+/*
+ * CEnumFormatEtc - implements IEnumFORMATETC
+ */
+
+#include <ole2.h>
+
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+
+// FORMATETC container
+class FormatEtc {
+ public:
+ FormatEtc() { memset(&mFormat, 0, sizeof(FORMATETC)); }
+ FormatEtc(const FormatEtc& copy) { CopyIn(&copy.mFormat); }
+ ~FormatEtc() {
+ if (mFormat.ptd) CoTaskMemFree(mFormat.ptd);
+ }
+
+ void CopyIn(const FORMATETC* aSrc) {
+ if (!aSrc) {
+ memset(&mFormat, 0, sizeof(FORMATETC));
+ return;
+ }
+ mFormat = *aSrc;
+ if (aSrc->ptd) {
+ mFormat.ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
+ *(mFormat.ptd) = *(aSrc->ptd);
+ }
+ }
+
+ void CopyOut(LPFORMATETC aDest) {
+ if (!aDest) return;
+ *aDest = mFormat;
+ if (mFormat.ptd) {
+ aDest->ptd = (DVTARGETDEVICE*)CoTaskMemAlloc(sizeof(DVTARGETDEVICE));
+ *(aDest->ptd) = *(mFormat.ptd);
+ }
+ }
+
+ private:
+ FORMATETC mFormat;
+};
+
+/*
+ * CEnumFormatEtc is created within IDataObject::EnumFormatEtc. This object
+ * lives on its own, that is, QueryInterface only knows IUnknown and
+ * IEnumFormatEtc, nothing more. We still use an outer unknown for reference
+ * counting, because as long as this enumerator lives, the data object should
+ * live, thereby keeping the application up.
+ */
+
+class CEnumFormatEtc final : public IEnumFORMATETC {
+ public:
+ explicit CEnumFormatEtc(nsTArray<FormatEtc>& aArray);
+ CEnumFormatEtc();
+ ~CEnumFormatEtc();
+
+ // IUnknown impl.
+ STDMETHODIMP QueryInterface(REFIID riid, LPVOID* ppv);
+ STDMETHODIMP_(ULONG) AddRef();
+ STDMETHODIMP_(ULONG) Release();
+
+ // IEnumFORMATETC impl.
+ STDMETHODIMP Next(ULONG aMaxToFetch, FORMATETC* aResult, ULONG* aNumFetched);
+ STDMETHODIMP Skip(ULONG aSkipNum);
+ STDMETHODIMP Reset();
+ STDMETHODIMP Clone(LPENUMFORMATETC* aResult); // Addrefs
+
+ // Utils
+ void AddFormatEtc(LPFORMATETC aFormat);
+
+ private:
+ nsTArray<FormatEtc> mFormatList; // Formats
+ ULONG mRefCnt; // Object reference count
+ ULONG mCurrentIdx; // Current element
+
+ void SetIndex(uint32_t aIdx);
+};
+
+#endif //_IENUMFE_H_