1 files changed, 74 insertions, 0 deletions
diff --git a/editor/libeditor/DeleteNodeTransaction.h b/editor/libeditor/DeleteNodeTransaction.h
new file mode 100644
index 0000000000..c0e7a00508
--- /dev/null
+++ b/editor/libeditor/DeleteNodeTransaction.h
@@ -0,0 +1,74 @@
+/* -*- 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 DeleteNodeTransaction_h
+#define DeleteNodeTransaction_h
+
+#include "mozilla/EditTransactionBase.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIContent.h"
+#include "nsINode.h"
+#include "nsISupportsImpl.h"
+#include "nscore.h"
+
+namespace mozilla {
+
+class EditorBase;
+
+/**
+ * A transaction that deletes a single element
+ */
+class DeleteNodeTransaction final : public EditTransactionBase {
+ protected:
+  DeleteNodeTransaction(EditorBase& aEditorBase, nsIContent& aContentToDelete);
+
+ public:
+  /**
+   * Creates a delete node transaction instance.  This returns nullptr if
+   * it cannot remove the node from its parent.
+   *
+   * @param aEditorBase         The editor.
+   * @param aContentToDelete    The node to be removed from the DOM tree.
+   */
+  static already_AddRefed<DeleteNodeTransaction> MaybeCreate(
+      EditorBase& aEditorBase, nsIContent& aContentToDelete);
+
+  /**
+   * CanDoIt() returns true if there are enough members and can modify the
+   * parent.  Otherwise, false.
+   */
+  bool CanDoIt() const;
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DeleteNodeTransaction,
+                                           EditTransactionBase)
+
+  NS_DECL_EDITTRANSACTIONBASE
+  NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(DeleteNodeTransaction)
+
+  MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() override;
+
+  nsIContent* GetContent() const { return mContentToDelete; }
+
+ protected:
+  virtual ~DeleteNodeTransaction() = default;
+
+  // The editor for this transaction.
+  RefPtr<EditorBase> mEditorBase;
+
+  // The element to delete.
+  nsCOMPtr<nsIContent> mContentToDelete;
+
+  // Parent of node to delete.
+  nsCOMPtr<nsINode> mParentNode;
+
+  // Next sibling to remember for undo/redo purposes.
+  nsCOMPtr<nsIContent> mRefContent;
+};
+
+}  // namespace mozilla
+
+#endif  // #ifndef DeleteNodeTransaction_h