1 files changed, 77 insertions, 0 deletions
diff --git a/editor/libeditor/SplitNodeTransaction.h b/editor/libeditor/SplitNodeTransaction.h
new file mode 100644
index 0000000000..8a591570b4
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+++ b/editor/libeditor/SplitNodeTransaction.h
@@ -0,0 +1,77 @@
+/* -*- 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 SplitNodeTransaction_h
+#define SplitNodeTransaction_h
+
+#include "mozilla/EditorDOMPoint.h"  // for RangeBoundary, EditorRawDOMPoint
+#include "mozilla/EditTransactionBase.h"  // for EditTxn, etc.
+#include "nsCOMPtr.h"                     // for nsCOMPtr
+#include "nsCycleCollectionParticipant.h"
+#include "nsIContent.h"
+#include "nsISupportsImpl.h"  // for NS_DECL_ISUPPORTS_INHERITED
+#include "nscore.h"           // for NS_IMETHOD
+
+namespace mozilla {
+
+class HTMLEditor;
+
+/**
+ * A transaction that splits a node into two identical nodes, with the children
+ * divided between the new nodes.
+ */
+class SplitNodeTransaction final : public EditTransactionBase {
+ private:
+  template <typename PT, typename CT>
+  SplitNodeTransaction(HTMLEditor& aHTMLEditor,
+                       const EditorDOMPointBase<PT, CT>& aStartOfRightContent);
+
+ public:
+  /**
+   * Creates a transaction to create a new node (left node) identical to an
+   * existing node (right node), and split the contents between the same point
+   * in both nodes.
+   *
+   * @param aHTMLEditor             The provider of core editing operations.
+   * @param aStartOfRightContent    The point to split.  Its container will be
+   *                                the right node, i.e., become the new node's
+   *                                next sibling.  And the point will be start
+   *                                of the right node.
+   */
+  template <typename PT, typename CT>
+  static already_AddRefed<SplitNodeTransaction> Create(
+      HTMLEditor& aHTMLEditor,
+      const EditorDOMPointBase<PT, CT>& aStartOfRightContent);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SplitNodeTransaction,
+                                           EditTransactionBase)
+
+  NS_DECL_EDITTRANSACTIONBASE
+  NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(SplitNodeTransaction)
+
+  MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() override;
+
+  nsIContent* GetNewLeftContent() const { return mNewLeftContent; }
+
+ protected:
+  virtual ~SplitNodeTransaction() = default;
+
+  RefPtr<HTMLEditor> mHTMLEditor;
+
+  // The container is existing right node (will be split).
+  // The point referring this is start of the right node after it's split.
+  EditorDOMPoint mStartOfRightContent;
+
+  // The node we create when splitting mExistingRightContent.
+  nsCOMPtr<nsIContent> mNewLeftContent;
+
+  // The parent shared by mExistingRightContent and mNewLeftContent.
+  nsCOMPtr<nsINode> mContainerParentNode;
+};
+
+}  // namespace mozilla
+
+#endif  // #ifndef SplitNodeTransaction_h