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comparison: editor/libeditor/base/JoinElementTxn.h
editor/libeditor/base/JoinElementTxn.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef JoinElementTxn_h__ | |
| 7 #define JoinElementTxn_h__ | |
| 8 | |
| 9 #include "EditTxn.h" // for EditTxn, NS_DECL_EDITTXN | |
| 10 #include "nsCOMPtr.h" // for nsCOMPtr | |
| 11 #include "nsCycleCollectionParticipant.h" | |
| 12 #include "nsID.h" // for REFNSIID | |
| 13 #include "nsIDOMNode.h" // for nsIDOMNode | |
| 14 #include "nscore.h" // for NS_IMETHOD | |
| 15 | |
| 16 class nsEditor; | |
| 17 | |
| 18 /** | |
| 19 * A transaction that joins two elements E1 (left node) and E2 (right node) | |
| 20 * into a single node E. | |
| 21 * The children of E are the children of E1 followed by the children of E2. | |
| 22 * After DoTransaction() and RedoTransaction(), E1 is removed from the content | |
| 23 * tree and E2 remains. | |
| 24 */ | |
| 25 class JoinElementTxn : public EditTxn | |
| 26 { | |
| 27 public: | |
| 28 /** initialize the transaction | |
| 29 * @param aEditor the provider of core editing operations | |
| 30 * @param aLeftNode the first of two nodes to join | |
| 31 * @param aRightNode the second of two nodes to join | |
| 32 */ | |
| 33 NS_IMETHOD Init(nsEditor *aEditor, | |
| 34 nsIDOMNode *aLeftNode, | |
| 35 nsIDOMNode *aRightNode); | |
| 36 | |
| 37 JoinElementTxn(); | |
| 38 | |
| 39 NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(JoinElementTxn, EditTxn) | |
| 40 NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr); | |
| 41 | |
| 42 NS_DECL_EDITTXN | |
| 43 | |
| 44 protected: | |
| 45 | |
| 46 /** the elements to operate upon. | |
| 47 * After the merge, mRightNode remains and mLeftNode is removed from the content tree. | |
| 48 */ | |
| 49 nsCOMPtr<nsIDOMNode> mLeftNode; | |
| 50 nsCOMPtr<nsIDOMNode> mRightNode; | |
| 51 | |
| 52 /** the offset into mNode where the children of mElement are split (for undo).<BR> | |
| 53 * mOffset is the index of the first child in the right node. | |
| 54 * -1 means the left node had no children. | |
| 55 */ | |
| 56 uint32_t mOffset; | |
| 57 | |
| 58 /** the parent node containing mLeftNode and mRightNode */ | |
| 59 nsCOMPtr<nsIDOMNode> mParent; | |
| 60 nsEditor* mEditor; | |
| 61 }; | |
| 62 | |
| 63 #endif |
