gecko-dev/editor/libeditor/SplitNodeTxn.h

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/* -*- 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 SplitNodeTxn_h__
#define SplitNodeTxn_h__
#include "EditTxn.h" // for EditTxn, NS_DECL_EDITTXN
#include "nsCOMPtr.h" // for nsCOMPtr
#include "nsCycleCollectionParticipant.h"
#include "nsISupportsImpl.h" // for NS_DECL_ISUPPORTS_INHERITED
#include "nscore.h" // for NS_IMETHOD
class nsEditor;
class nsIContent;
class nsINode;
namespace mozilla {
namespace dom {
/**
* A transaction that splits a node into two identical nodes, with the children
* divided between the new nodes.
*/
class SplitNodeTxn : public EditTxn
{
public:
/** @param aEditor The provider of core editing operations
* @param aNode The node to split
* @param aOffset The location within aNode to do the split.
* aOffset may refer to children of aNode, or content of aNode.
* The left node will have child|content 0..aOffset-1.
*/
SplitNodeTxn(nsEditor& aEditor, nsIContent& aNode, int32_t aOffset);
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SplitNodeTxn, EditTxn)
NS_DECL_EDITTXN
NS_IMETHOD RedoTransaction() MOZ_OVERRIDE;
nsIContent* GetNewNode();
protected:
virtual ~SplitNodeTxn();
nsEditor& mEditor;
/** The node to operate upon */
nsCOMPtr<nsIContent> mExistingRightNode;
/** The offset into mExistingRightNode where its children are split. mOffset
* is the index of the first child in the right node. -1 means the new node
* gets no children.
*/
int32_t mOffset;
/** The node we create when splitting mExistingRightNode */
nsCOMPtr<nsIContent> mNewLeftNode;
/** The parent shared by mExistingRightNode and mNewLeftNode */
nsCOMPtr<nsINode> mParent;
};
}
}
#endif