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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 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 nsIContent;
class nsINode;
namespace mozilla {
class HTMLEditor;
/**
* 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 {
protected:
JoinNodeTransaction(HTMLEditor& aHTMLEditor, nsIContent& aLeftContent,
nsIContent& aRightContent);
public:
/**
* Creates a join node transaction. This returns nullptr if cannot join the
* nodes.
*
* @param aHTMLEditor The provider of core editing operations.
* @param aLeftContent The first of two nodes to join.
* @param aRightContent The second of two nodes to join.
*/
static already_AddRefed<JoinNodeTransaction> MaybeCreate(
HTMLEditor& aHTMLEditor, nsIContent& aLeftContent,
nsIContent& aRightContent);
/**
* CanDoIt() returns true if there are enough members and can join or
* restore the nodes. Otherwise, false.
*/
bool CanDoIt() const;
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(JoinNodeTransaction,
EditTransactionBase)
NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override;
NS_DECL_EDITTRANSACTIONBASE
NS_DECL_EDITTRANSACTIONBASE_GETASMETHODS_OVERRIDE(JoinNodeTransaction)
protected:
RefPtr<HTMLEditor> mHTMLEditor;
// The nodes to operate upon. After the merge, mRightContent remains and
// mLeftContent is removed from the content tree.
nsCOMPtr<nsIContent> mLeftContent;
nsCOMPtr<nsIContent> mRightContent;
// 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 mLeftContent and mRightContent.
nsCOMPtr<nsINode> mParentNode;
};
} // namespace mozilla
#endif // #ifndef JoinNodeTransaction_h
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