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37 :
38 : #ifndef JoinElementTxn_h__
39 : #define JoinElementTxn_h__
40 :
41 : #include "EditTxn.h"
42 : #include "nsIDOMNode.h"
43 : #include "nsCOMPtr.h"
44 : #include "nsIEditor.h"
45 :
46 : class nsEditor;
47 :
48 : /**
49 : * A transaction that joins two elements E1 (left node) and E2 (right node)
50 : * into a single node E.
51 : * The children of E are the children of E1 followed by the children of E2.
52 : * After DoTransaction() and RedoTransaction(), E1 is removed from the content
53 : * tree and E2 remains.
54 : */
55 : class JoinElementTxn : public EditTxn
56 0 : {
57 : public:
58 : /** initialize the transaction
59 : * @param aEditor the provider of core editing operations
60 : * @param aLeftNode the first of two nodes to join
61 : * @param aRightNode the second of two nodes to join
62 : */
63 : NS_IMETHOD Init(nsEditor *aEditor,
64 : nsIDOMNode *aLeftNode,
65 : nsIDOMNode *aRightNode);
66 :
67 : JoinElementTxn();
68 :
69 1464 : NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(JoinElementTxn, EditTxn)
70 : NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr);
71 :
72 : NS_DECL_EDITTXN
73 :
74 : protected:
75 :
76 : /** the elements to operate upon.
77 : * After the merge, mRightNode remains and mLeftNode is removed from the content tree.
78 : */
79 : nsCOMPtr<nsIDOMNode> mLeftNode;
80 : nsCOMPtr<nsIDOMNode> mRightNode;
81 :
82 : /** the offset into mNode where the children of mElement are split (for undo).<BR>
83 : * mOffset is the index of the first child in the right node.
84 : * -1 means the left node had no children.
85 : */
86 : PRUint32 mOffset;
87 :
88 : /** the parent node containing mLeftNode and mRightNode */
89 : nsCOMPtr<nsIDOMNode> mParent;
90 : nsEditor* mEditor;
91 : };
92 :
93 : #endif
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