gecko-dev/editor/base/DeleteElementTxn.cpp

176 lines
4.8 KiB
C++

/* -*- 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):
*/
#include "DeleteElementTxn.h"
#ifdef NS_DEBUG
#include "nsIDOMElement.h"
#endif
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
DeleteElementTxn::DeleteElementTxn()
: EditTxn()
{
SetTransactionDescriptionID( kTransactionID );
/* log description initialized in parent constructor */
}
NS_IMETHODIMP DeleteElementTxn::Init(nsIDOMNode *aElement)
{
if (nsnull!=aElement) {
mElement = do_QueryInterface(aElement);
}
else
return NS_ERROR_NULL_POINTER;
return NS_OK;
}
DeleteElementTxn::~DeleteElementTxn()
{
}
NS_IMETHODIMP DeleteElementTxn::Do(void)
{
if (gNoisy) { printf("%p Do Delete Element element = %p\n", this, mElement.get()); }
if (!mElement) return NS_ERROR_NOT_INITIALIZED;
nsresult result = mElement->GetParentNode(getter_AddRefs(mParent));
if (NS_FAILED(result)) { return result; }
if (!mParent) { return NS_OK; } // this is a no-op, there's no parent to delete mElement from
#ifdef NS_DEBUG
// begin debug output
nsCOMPtr<nsIDOMElement> element;
element = do_QueryInterface(mElement);
nsAutoString elementTag="text node";
if (element)
element->GetTagName(elementTag);
nsCOMPtr<nsIDOMElement> parentElement;
parentElement = do_QueryInterface(mParent);
nsAutoString parentElementTag="text node";
if (parentElement)
parentElement->GetTagName(parentElementTag);
char *c, *p;
c = elementTag.ToNewCString();
p = parentElementTag.ToNewCString();
if (c&&p)
{
if (gNoisy)
printf(" DeleteElementTxn: deleting child %s from parent %s\n", c, p);
nsCRT::free(c);
nsCRT::free(p);
}
// end debug output
#endif
// remember which child mElement was (by remembering which child was next)
result = mElement->GetNextSibling(getter_AddRefs(mRefNode)); // can return null mRefNode
nsCOMPtr<nsIDOMNode> resultNode;
result = mParent->RemoveChild(mElement, getter_AddRefs(resultNode));
return result;
}
NS_IMETHODIMP DeleteElementTxn::Undo(void)
{
if (gNoisy) { printf("%p Undo Delete Element element = %p, parent = %p\n", this, mElement.get(), mParent.get()); }
if (!mParent) { return NS_OK; } // this is a legal state, the txn is a no-op
if (!mElement) { return NS_ERROR_NULL_POINTER; }
#ifdef NS_DEBUG
// begin debug output
nsCOMPtr<nsIDOMElement> element;
element = do_QueryInterface(mElement);
nsAutoString elementTag="text node";
if (element)
element->GetTagName(elementTag);
nsCOMPtr<nsIDOMElement> parentElement;
parentElement = do_QueryInterface(mParent);
nsAutoString parentElementTag="text node";
if (parentElement)
parentElement->GetTagName(parentElementTag);
char *c, *p;
c = elementTag.ToNewCString();
p = parentElementTag.ToNewCString();
if (c&&p)
{
if (gNoisy)
printf(" DeleteElementTxn: inserting child %s back into parent %s\n", c, p);
nsCRT::free(c);
nsCRT::free(p);
}
// end debug output
#endif
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->InsertBefore(mElement, mRefNode, getter_AddRefs(resultNode));
return result;
}
NS_IMETHODIMP DeleteElementTxn::Redo(void)
{
if (gNoisy) { printf("%p Redo Delete Element element = %p, parent = %p\n", this, mElement.get(), mParent.get()); }
if (!mParent) { return NS_OK; } // this is a legal state, the txn is a no-op
if (!mElement) { return NS_ERROR_NULL_POINTER; }
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->RemoveChild(mElement, getter_AddRefs(resultNode));
return result;
}
NS_IMETHODIMP DeleteElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP DeleteElementTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP DeleteElementTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Insert Element: ";
}
return NS_OK;
}
NS_IMETHODIMP DeleteElementTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Remove Element: ";
}
return NS_OK;
}