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189 lines
6.6 KiB
C++
189 lines
6.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "JoinElementTxn.h"
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#include "nsEditor.h"
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#include "nsIDOMNodeList.h"
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#include "nsIDOMCharacterData.h"
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#ifdef NS_DEBUG
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static PRBool gNoisy = PR_FALSE;
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#endif
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JoinElementTxn::JoinElementTxn()
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: EditTxn()
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{
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}
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NS_IMPL_CYCLE_COLLECTION_CLASS(JoinElementTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(JoinElementTxn, EditTxn)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLeftNode)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mRightNode)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(JoinElementTxn, EditTxn)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLeftNode)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mRightNode)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParent)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinElementTxn)
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NS_INTERFACE_MAP_END_INHERITING(EditTxn)
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NS_IMETHODIMP JoinElementTxn::Init(nsEditor *aEditor,
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nsIDOMNode *aLeftNode,
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nsIDOMNode *aRightNode)
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{
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NS_PRECONDITION((aEditor && aLeftNode && aRightNode), "null arg");
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if (!aEditor || !aLeftNode || !aRightNode) { return NS_ERROR_NULL_POINTER; }
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mEditor = aEditor;
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mLeftNode = do_QueryInterface(aLeftNode);
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nsCOMPtr<nsIDOMNode>leftParent;
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nsresult result = mLeftNode->GetParentNode(getter_AddRefs(leftParent));
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if (NS_FAILED(result)) return result;
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if (!mEditor->IsModifiableNode(leftParent)) {
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return NS_ERROR_FAILURE;
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}
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mRightNode = do_QueryInterface(aRightNode);
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mOffset=0;
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return NS_OK;
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}
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// After DoTransaction() and RedoTransaction(), the left node is removed from the content tree and right node remains.
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NS_IMETHODIMP JoinElementTxn::DoTransaction(void)
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{
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#ifdef NS_DEBUG
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if (gNoisy) { printf("%p Do Join of %p and %p\n", this, mLeftNode.get(), mRightNode.get()); }
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#endif
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NS_PRECONDITION((mEditor && mLeftNode && mRightNode), "null arg");
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if (!mEditor || !mLeftNode || !mRightNode) { return NS_ERROR_NOT_INITIALIZED; }
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// get the parent node
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nsCOMPtr<nsIDOMNode>leftParent;
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nsresult result = mLeftNode->GetParentNode(getter_AddRefs(leftParent));
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if (NS_FAILED(result)) return result;
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if (!leftParent) return NS_ERROR_NULL_POINTER;
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// verify that mLeftNode and mRightNode have the same parent
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nsCOMPtr<nsIDOMNode>rightParent;
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result = mRightNode->GetParentNode(getter_AddRefs(rightParent));
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if (NS_FAILED(result)) return result;
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if (!rightParent) return NS_ERROR_NULL_POINTER;
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if (leftParent==rightParent)
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{
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mParent= do_QueryInterface(leftParent); // set this instance mParent.
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// Other methods will see a non-null mParent and know all is well
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nsCOMPtr<nsIDOMCharacterData> leftNodeAsText = do_QueryInterface(mLeftNode);
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if (leftNodeAsText)
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{
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leftNodeAsText->GetLength(&mOffset);
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}
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else
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{
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nsCOMPtr<nsIDOMNodeList> childNodes;
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result = mLeftNode->GetChildNodes(getter_AddRefs(childNodes));
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if (NS_FAILED(result)) return result;
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if (childNodes)
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{
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childNodes->GetLength(&mOffset);
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}
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}
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result = mEditor->JoinNodesImpl(mRightNode, mLeftNode, mParent, PR_FALSE);
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#ifdef NS_DEBUG
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if (NS_SUCCEEDED(result))
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{
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if (gNoisy) { printf(" left node = %p removed\n", mLeftNode.get()); }
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}
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#endif
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}
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else
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{
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NS_ASSERTION(PR_FALSE, "2 nodes do not have same parent");
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return NS_ERROR_INVALID_ARG;
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}
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return result;
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}
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//XXX: what if instead of split, we just deleted the unneeded children of mRight
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// and re-inserted mLeft?
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NS_IMETHODIMP JoinElementTxn::UndoTransaction(void)
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{
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#ifdef NS_DEBUG
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if (gNoisy) { printf("%p Undo Join, right node = %p\n", this, mRightNode.get()); }
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#endif
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NS_ASSERTION(mRightNode && mLeftNode && mParent, "bad state");
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if (!mRightNode || !mLeftNode || !mParent) { return NS_ERROR_NOT_INITIALIZED; }
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nsresult result;
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nsCOMPtr<nsIDOMNode>resultNode;
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// first, massage the existing node so it is in its post-split state
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nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mRightNode);
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if (rightNodeAsText)
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{
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result = rightNodeAsText->DeleteData(0, mOffset);
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}
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else
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{
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nsCOMPtr<nsIDOMNode>child;
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result = mRightNode->GetFirstChild(getter_AddRefs(child));
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nsCOMPtr<nsIDOMNode>nextSibling;
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PRUint32 i;
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for (i=0; i<mOffset; i++)
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{
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if (NS_FAILED(result)) {return result;}
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if (!child) {return NS_ERROR_NULL_POINTER;}
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child->GetNextSibling(getter_AddRefs(nextSibling));
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result = mLeftNode->AppendChild(child, getter_AddRefs(resultNode));
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child = do_QueryInterface(nextSibling);
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}
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}
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// second, re-insert the left node into the tree
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result = mParent->InsertBefore(mLeftNode, mRightNode, getter_AddRefs(resultNode));
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return result;
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}
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NS_IMETHODIMP JoinElementTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("JoinElementTxn");
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return NS_OK;
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}
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