gecko-dev/editor/base/SplitElementTxn.h

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C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef SplitElementTxn_h__
#define SplitElementTxn_h__
#include "EditTxn.h"
#include "nsIDOMNode.h"
#include "nsCOMPtr.h"
#include "nsIEditor.h"
#define SPLIT_ELEMENT_TXN_CID \
{/* 690c6290-ac48-11d2-86d8-000064657374 */ \
0x690c6290, 0xac48, 0x11d2, \
{0x86, 0xd8, 0x0, 0x0, 0x64, 0x65, 0x73, 0x74} }
class nsEditor;
/**
* A transaction that splits an element E into two identical nodes, E1 and E2
* with the children of E divided between E1 and E2.
*/
class SplitElementTxn : public EditTxn
{
public:
static const nsIID& GetCID() { static nsIID iid = SPLIT_ELEMENT_TXN_CID; return iid; }
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/** initialize the transaction.
* @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.
*/
NS_IMETHOD Init (nsEditor *aEditor,
nsIDOMNode *aNode,
PRInt32 aOffset);
protected:
SplitElementTxn();
public:
virtual ~SplitElementTxn();
NS_IMETHOD Do(void);
NS_IMETHOD Undo(void);
As a reminder, we decided to do this based strictly content. Some support for style-based text properties is written, but not used anywhere any more. * Cleaned up split and join undo/redo. * Added TypeInState, a data struct that remembers things about text properties for collapsed selections, so you can type * Ctrl-B with an insertion point and the next character will be bold. * Added all the logic to handle inline vs. block elements when setting text properties. * Added some support for italic and underline as well. Adding these things is pretty easy now. Ctrl-B, Ctrl-I, Ctrl-U for testing bold, italic, underline. * Added all the logic to make sure we only add style tags where they're needed, so you should never get the same style tag nested within itself, except as needed for block elements. * Added methods for testing a node to see if a particular style is set. This isn't 100% done yet, but with very little work we could have toolbar buttons that respond to selection changed notification that show the state of bold, italic, underline, etc. in real time. Supports tri-state: whole selection is bold, some of selection is bold, none of selection is bold, ... * Fully undoable and redoable. * Added some debug printfs to transactions and editors. all controlled by a gNoisy static in each module. helps me track down undo/redo problems. if the output bugs people enough, I'll shut it off and re-enable it in my local tree. Noticably missing: make un-bold, make un-italic, etc. This is coming soon.
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NS_IMETHOD Redo(void);
NS_IMETHOD Merge(PRBool *aDidMerge, nsITransaction *aTransaction);
NS_IMETHOD Write(nsIOutputStream *aOutputStream);
NS_IMETHOD GetUndoString(nsString *aString);
NS_IMETHOD GetRedoString(nsString *aString);
NS_IMETHOD GetNewNode(nsIDOMNode **aNewNode);
enum { kTransactionID = 11190 };
protected:
/** the element to operate upon */
nsCOMPtr<nsIDOMNode> mExistingRightNode;
/** the offset into mElement where the children of mElement are split.<BR>
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* mOffset is the index of the first child in the right node.
* -1 means the new node gets no children.
*/
PRInt32 mOffset;
/** the element we create when splitting mElement */
nsCOMPtr<nsIDOMNode> mNewLeftNode;
/** the parent shared by mExistingRightNode and mNewLeftNode */
nsCOMPtr<nsIDOMNode> mParent;
nsEditor* mEditor;
friend class TransactionFactory;
};
#endif