1 files changed, 43 insertions, 0 deletions
diff --git a/comm/mailnews/base/src/nsMsgReadStateTxn.cpp b/comm/mailnews/base/src/nsMsgReadStateTxn.cpp
new file mode 100644
index 0000000000..80cd0d0bd1
--- /dev/null
+++ b/comm/mailnews/base/src/nsMsgReadStateTxn.cpp
@@ -0,0 +1,43 @@
+/* -*- 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 "nsMsgReadStateTxn.h"
+
+#include "nsIMsgHdr.h"
+#include "nsComponentManagerUtils.h"
+
+nsMsgReadStateTxn::nsMsgReadStateTxn() {}
+
+nsMsgReadStateTxn::~nsMsgReadStateTxn() {}
+
+nsresult nsMsgReadStateTxn::Init(nsIMsgFolder* aParentFolder, uint32_t aNumKeys,
+                                 nsMsgKey* aMsgKeyArray) {
+  NS_ENSURE_ARG_POINTER(aParentFolder);
+
+  mParentFolder = aParentFolder;
+  mMarkedMessages.AppendElements(aMsgKeyArray, aNumKeys);
+
+  return nsMsgTxn::Init();
+}
+
+NS_IMETHODIMP
+nsMsgReadStateTxn::UndoTransaction() { return MarkMessages(false); }
+
+NS_IMETHODIMP
+nsMsgReadStateTxn::RedoTransaction() { return MarkMessages(true); }
+
+NS_IMETHODIMP
+nsMsgReadStateTxn::MarkMessages(bool aAsRead) {
+  nsTArray<RefPtr<nsIMsgDBHdr>> messages(mMarkedMessages.Length());
+  for (auto msgKey : mMarkedMessages) {
+    nsCOMPtr<nsIMsgDBHdr> curMsgHdr;
+    nsresult rv =
+        mParentFolder->GetMessageHeader(msgKey, getter_AddRefs(curMsgHdr));
+    if (NS_SUCCEEDED(rv) && curMsgHdr) {
+      messages.AppendElement(curMsgHdr);
+    }
+  }
+  return mParentFolder->MarkMessagesRead(messages, aAsRead);
+}