1 files changed, 119 insertions, 0 deletions
diff --git a/editor/libeditor/MoveNodeTransaction.h b/editor/libeditor/MoveNodeTransaction.h
new file mode 100644
index 0000000000..8ab1cd5b8b
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+++ b/editor/libeditor/MoveNodeTransaction.h
@@ -0,0 +1,119 @@
+/* -*- 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 MoveNodeTransaction_h
+#define MoveNodeTransaction_h
+
+#include "EditTransactionBase.h"  // for EditTransactionBase, etc.
+
+#include "EditorForwards.h"
+
+#include "nsCOMPtr.h"  // for nsCOMPtr
+#include "nsCycleCollectionParticipant.h"
+#include "nsIContent.h"       // for nsIContent
+#include "nsISupportsImpl.h"  // for NS_DECL_ISUPPORTS_INHERITED
+
+namespace mozilla {
+
+/**
+ * A transaction that moves a content node to a specified point.
+ */
+class MoveNodeTransaction final : public EditTransactionBase {
+ protected:
+  template <typename PT, typename CT>
+  MoveNodeTransaction(HTMLEditor& aHTMLEditor, nsIContent& aContentToMove,
+                      const EditorDOMPointBase<PT, CT>& aPointToInsert);
+
+ public:
+  /**
+   * Create a transaction for moving aContentToMove before the child at
+   * aPointToInsert.
+   *
+   * @param aHTMLEditor         The editor which manages the transaction.
+   * @param aContentToMove      The node to be moved.
+   * @param aPointToInsert      The insertion point of aContentToMove.
+   * @return                    A MoveNodeTransaction which was initialized
+   *                            with the arguments.
+   */
+  template <typename PT, typename CT>
+  static already_AddRefed<MoveNodeTransaction> MaybeCreate(
+      HTMLEditor& aHTMLEditor, nsIContent& aContentToMove,
+      const EditorDOMPointBase<PT, CT>& aPointToInsert);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MoveNodeTransaction,
+                                           EditTransactionBase)
+
+  NS_DECL_EDITTRANSACTIONBASE
+  NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(MoveNodeTransaction)
+
+  MOZ_CAN_RUN_SCRIPT NS_IMETHOD RedoTransaction() override;
+
+  /**
+   * SuggestPointToPutCaret() suggests a point after doing or redoing the
+   * transaction.
+   */
+  template <typename EditorDOMPointType>
+  EditorDOMPointType SuggestPointToPutCaret() const {
+    if (MOZ_UNLIKELY(!mContainer || !mContentToMove)) {
+      return EditorDOMPointType();
+    }
+    return EditorDOMPointType::After(mContentToMove);
+  }
+
+  /**
+   * Suggest next insertion point if the caller wants to move another content
+   * node around the insertion point.
+   */
+  template <typename EditorDOMPointType>
+  EditorDOMPointType SuggestNextInsertionPoint() const {
+    if (MOZ_UNLIKELY(!mContainer)) {
+      return EditorDOMPointType();
+    }
+    if (!mReference) {
+      return EditorDOMPointType::AtEndOf(mContainer);
+    }
+    if (MOZ_UNLIKELY(mReference->GetParentNode() != mContainer)) {
+      if (MOZ_LIKELY(mContentToMove->GetParentNode() == mContainer)) {
+        return EditorDOMPointType(mContentToMove).NextPoint();
+      }
+      return EditorDOMPointType::AtEndOf(mContainer);
+    }
+    return EditorDOMPointType(mReference);
+  }
+
+  friend std::ostream& operator<<(std::ostream& aStream,
+                                  const MoveNodeTransaction& aTransaction);
+
+ protected:
+  virtual ~MoveNodeTransaction() = default;
+
+  MOZ_CAN_RUN_SCRIPT nsresult DoTransactionInternal();
+
+  // The content which will be or was moved from mOldContainer to mContainer.
+  nsCOMPtr<nsIContent> mContentToMove;
+
+  // mContainer is new container of mContentToInsert after (re-)doing the
+  // transaction.
+  nsCOMPtr<nsINode> mContainer;
+
+  // mReference is the child content where mContentToMove should be or was
+  // inserted into the mContainer.  This is typically the next sibling of
+  // mContentToMove after moving.
+  nsCOMPtr<nsIContent> mReference;
+
+  // mOldContainer is the original container of mContentToMove before moving.
+  nsCOMPtr<nsINode> mOldContainer;
+
+  // mOldNextSibling is the next sibling of mCOntentToMove before moving.
+  nsCOMPtr<nsIContent> mOldNextSibling;
+
+  // The editor for this transaction.
+  RefPtr<HTMLEditor> mHTMLEditor;
+};
+
+}  // namespace mozilla
+
+#endif  // #ifndef MoveNodeTransaction_h