1 files changed, 72 insertions, 0 deletions
diff --git a/editor/libeditor/ChangeAttributeTransaction.h b/editor/libeditor/ChangeAttributeTransaction.h
new file mode 100644
index 000000000..bb0c26c38
--- /dev/null
+++ b/editor/libeditor/ChangeAttributeTransaction.h
@@ -0,0 +1,72 @@
+/* -*- 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 ChangeAttributeTransaction_h
+#define ChangeAttributeTransaction_h
+
+#include "mozilla/Attributes.h"           // override
+#include "mozilla/EditTransactionBase.h"  // base class
+#include "nsCOMPtr.h"                     // nsCOMPtr members
+#include "nsCycleCollectionParticipant.h" // NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED
+#include "nsISupportsImpl.h"              // NS_DECL_ISUPPORTS_INHERITED
+#include "nsString.h"                     // nsString members
+
+class nsIAtom;
+
+namespace mozilla {
+
+namespace dom {
+class Element;
+} // namespace dom
+
+/**
+ * A transaction that changes an attribute of a content node.  This transaction
+ * covers add, remove, and change attribute.
+ */
+class ChangeAttributeTransaction final : public EditTransactionBase
+{
+public:
+  /**
+   * @param aElement   the element whose attribute will be changed
+   * @param aAttribute the name of the attribute to change
+   * @param aValue     the new value for aAttribute, or null to remove
+   */
+  ChangeAttributeTransaction(dom::Element& aElement,
+                             nsIAtom& aAttribute,
+                             const nsAString* aValue);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(ChangeAttributeTransaction,
+                                           EditTransactionBase)
+
+  NS_DECL_EDITTRANSACTIONBASE
+
+  NS_IMETHOD RedoTransaction() override;
+
+private:
+  virtual ~ChangeAttributeTransaction();
+
+  // The element to operate upon
+  nsCOMPtr<dom::Element> mElement;
+
+  // The attribute to change
+  nsCOMPtr<nsIAtom> mAttribute;
+
+  // The value to set the attribute to (ignored if mRemoveAttribute==true)
+  nsString mValue;
+
+  // True if the operation is to remove mAttribute from mElement
+  bool mRemoveAttribute;
+
+  // True if the mAttribute was set on mElement at the time of execution
+  bool mAttributeWasSet;
+
+  // The value to set the attribute to for undo
+  nsString mUndoValue;
+};
+
+} // namespace mozilla
+
+#endif // #ifndef ChangeAttributeTransaction_h