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-rw-r--r--editor/txmgr/TransactionStack.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/editor/txmgr/TransactionStack.h b/editor/txmgr/TransactionStack.h
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+++ b/editor/txmgr/TransactionStack.h
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+/* -*- 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 mozilla_TransactionStack_h
+#define mozilla_TransactionStack_h
+
+#include "mozilla/AlreadyAddRefed.h"
+#include "nsDeque.h"
+
+class nsCycleCollectionTraversalCallback;
+
+namespace mozilla {
+
+class TransactionItem;
+
+class TransactionStack : private nsRefPtrDeque<TransactionItem> {
+ public:
+ enum Type { FOR_UNDO, FOR_REDO };
+
+ explicit TransactionStack(Type aType);
+ ~TransactionStack();
+
+ void Push(TransactionItem* aTransactionItem);
+ void Push(already_AddRefed<TransactionItem> aTransactionItem);
+ already_AddRefed<TransactionItem> Pop();
+ already_AddRefed<TransactionItem> PopBottom();
+ already_AddRefed<TransactionItem> Peek() const;
+ already_AddRefed<TransactionItem> GetItemAt(size_t aIndex) const;
+ void Clear();
+ size_t GetSize() const { return nsRefPtrDeque<TransactionItem>::GetSize(); }
+ bool IsEmpty() const { return GetSize() == 0; }
+
+ void DoUnlink() { Clear(); }
+ void DoTraverse(nsCycleCollectionTraversalCallback& cb);
+
+ private:
+ const Type mType;
+};
+
+} // namespace mozilla
+
+#endif // mozilla_TransactionStack_h