зеркало из https://github.com/mozilla/gecko-dev.git
145 строки
3.6 KiB
C++
145 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "DeleteElementTxn.h"
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#ifdef NS_DEBUG
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#include "nsIDOMElement.h"
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#endif
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#ifdef NS_DEBUG
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static PRBool gNoisy = PR_FALSE;
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#else
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static const PRBool gNoisy = PR_FALSE;
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#endif
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DeleteElementTxn::DeleteElementTxn()
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: EditTxn()
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{
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}
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nsresult DeleteElementTxn::Init(nsIDOMNode *aElement,
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nsIDOMNode *aParent)
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{
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if ((nsnull!=aElement) && (nsnull!=aParent))
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{
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mElement = aElement;
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mParent = aParent;
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return NS_OK;
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}
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else
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return NS_ERROR_NULL_POINTER;
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}
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DeleteElementTxn::~DeleteElementTxn()
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{
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}
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nsresult DeleteElementTxn::Do(void)
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{
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if (!mParent || !mElement)
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return NS_ERROR_NULL_POINTER;
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#ifdef NS_DEBUG
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// begin debug output
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nsCOMPtr<nsIDOMElement> element(mElement);
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nsAutoString elementTag="text node";
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if (element)
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element->GetTagName(elementTag);
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nsCOMPtr<nsIDOMElement> parentElement(mParent);
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nsAutoString parentElementTag="text node";
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if (parentElement)
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parentElement->GetTagName(parentElementTag);
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char *c, *p;
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c = elementTag.ToNewCString();
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p = parentElementTag.ToNewCString();
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if (c&&p)
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{
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if (gNoisy)
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printf("DeleteElementTxn: deleting child %s from parent %s\n", c, p);
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delete [] c;
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delete [] p;
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}
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// end debug output
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// begin sanity check 1: parent-child relationship
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nsresult testResult;
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nsCOMPtr<nsIDOMNode> parentNode;
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testResult = mElement->GetParentNode(getter_AddRefs(parentNode));
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NS_ASSERTION((NS_SUCCEEDED(testResult)), "bad mElement, couldn't get parent");
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NS_ASSERTION((parentNode==mParent), "bad mParent, mParent!=mElement->GetParent() ");
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// end sanity check 1.
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#endif
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// remember which child mElement was (by remembering which child was next)
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nsresult result = mElement->GetNextSibling(getter_AddRefs(mRefNode)); // can return null mRefNode
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nsCOMPtr<nsIDOMNode> resultNode;
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result = mParent->RemoveChild(mElement, getter_AddRefs(resultNode));
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return result;
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}
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nsresult DeleteElementTxn::Undo(void)
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{
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if (!mParent || !mElement)
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return NS_ERROR_NULL_POINTER;
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nsCOMPtr<nsIDOMNode> resultNode;
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nsresult result = mParent->InsertBefore(mElement, mRefNode, getter_AddRefs(resultNode));
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return result;
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}
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nsresult DeleteElementTxn::Redo(void)
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{
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if (!mParent || !mElement)
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return NS_ERROR_NULL_POINTER;
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nsCOMPtr<nsIDOMNode> resultNode;
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nsresult result = mParent->RemoveChild(mElement, getter_AddRefs(resultNode));
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return result;
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}
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nsresult DeleteElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
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{
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if (nsnull!=aDidMerge)
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*aDidMerge=PR_FALSE;
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return NS_OK;
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}
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nsresult DeleteElementTxn::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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nsresult DeleteElementTxn::GetUndoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Insert Element: ";
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}
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return NS_OK;
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}
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nsresult DeleteElementTxn::GetRedoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Remove Element: ";
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}
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return NS_OK;
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}
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