/* -*- 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 JoinNodeTransaction_h #define JoinNodeTransaction_h #include "mozilla/EditTransactionBase.h" // for EditTransactionBase, etc. #include "nsCOMPtr.h" // for nsCOMPtr #include "nsCycleCollectionParticipant.h" #include "nsID.h" // for REFNSIID #include "nscore.h" // for NS_IMETHOD class nsINode; namespace mozilla { class EditorBase; /** * A transaction that joins two nodes E1 (left node) and E2 (right node) into a * single node E. The children of E are the children of E1 followed by the * children of E2. After DoTransaction() and RedoTransaction(), E1 is removed * from the content tree and E2 remains. */ class JoinNodeTransaction final : public EditTransactionBase { public: /** * @param aEditorBase The provider of core editing operations. * @param aLeftNode The first of two nodes to join. * @param aRightNode The second of two nodes to join. */ JoinNodeTransaction(EditorBase& aEditorBase, nsINode& aLeftNode, nsINode& aRightNode); /** * Call this after constructing to ensure the inputs are correct. */ nsresult CheckValidity(); NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(JoinNodeTransaction, EditTransactionBase) NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override; NS_DECL_EDITTRANSACTIONBASE protected: RefPtr<EditorBase> mEditorBase; // The nodes to operate upon. After the merge, mRightNode remains and // mLeftNode is removed from the content tree. nsCOMPtr<nsINode> mLeftNode; nsCOMPtr<nsINode> mRightNode; // The offset into mNode where the children of mElement are split (for // undo). mOffset is the index of the first child in the right node. -1 // means the left node had no children. uint32_t mOffset; // The parent node containing mLeftNode and mRightNode. nsCOMPtr<nsINode> mParent; }; } // namespace mozilla #endif // #ifndef JoinNodeTransaction_h