gecko/editor/libeditor/base/DeleteElementTxn.cpp

219 lines
6.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Initial Developer are Copyright (C) 1998-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsReadableUtils.h"
#include "nsCRT.h"
#include "DeleteElementTxn.h"
#include "nsSelectionState.h"
#ifdef NS_DEBUG
#include "nsIDOMElement.h"
#endif
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
DeleteElementTxn::DeleteElementTxn()
: EditTxn()
,mElement()
,mParent()
,mRefNode()
,mRangeUpdater(nsnull)
{
}
NS_IMPL_CYCLE_COLLECTION_CLASS(DeleteElementTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(DeleteElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mRefNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(DeleteElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mElement)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mRefNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteElementTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP DeleteElementTxn::Init(nsIEditor *aEditor,
nsIDOMNode *aElement,
nsRangeUpdater *aRangeUpdater)
{
NS_ENSURE_TRUE(aEditor && aElement, NS_ERROR_NULL_POINTER);
mEditor = aEditor;
mElement = do_QueryInterface(aElement);
nsresult result = mElement->GetParentNode(getter_AddRefs(mParent));
if (NS_FAILED(result)) { return result; }
// do nothing if the parent is read-only
if (mParent && !mEditor->IsModifiableNode(mParent)) {
return NS_ERROR_FAILURE;
}
mRangeUpdater = aRangeUpdater;
return NS_OK;
}
NS_IMETHODIMP DeleteElementTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
printf("%p Do Delete Element element = %p\n",
static_cast<void*>(this),
static_cast<void*>(mElement.get()));
}
#endif
NS_ENSURE_TRUE(mElement, NS_ERROR_NOT_INITIALIZED);
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 = do_QueryInterface(mElement);
nsAutoString elementTag(NS_LITERAL_STRING("text node"));
if (element)
element->GetTagName(elementTag);
nsCOMPtr<nsIDOMElement> parentElement = do_QueryInterface(mParent);
nsAutoString parentElementTag(NS_LITERAL_STRING("text node"));
if (parentElement)
parentElement->GetTagName(parentElementTag);
char *c, *p;
c = ToNewCString(elementTag);
p = ToNewCString(parentElementTag);
if (c&&p)
{
if (gNoisy)
printf(" DeleteElementTxn: deleting child %s from parent %s\n", c, p);
NS_Free(c);
NS_Free(p);
}
// end debug output
#endif
// remember which child mElement was (by remembering which child was next)
mElement->GetNextSibling(getter_AddRefs(mRefNode)); // can return null mRefNode
// give range updater a chance. SelAdjDeleteNode() needs to be called *before*
// we do the action, unlike some of the other nsRangeStore update methods.
if (mRangeUpdater)
mRangeUpdater->SelAdjDeleteNode(mElement);
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->RemoveChild(mElement, getter_AddRefs(resultNode));
}
NS_IMETHODIMP DeleteElementTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
printf("%p Undo Delete Element element = %p, parent = %p\n",
static_cast<void*>(this),
static_cast<void*>(mElement.get()),
static_cast<void*>(mParent.get()));
}
#endif
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 = do_QueryInterface(mElement);
nsAutoString elementTag(NS_LITERAL_STRING("text node"));
if (element)
element->GetTagName(elementTag);
nsCOMPtr<nsIDOMElement> parentElement = do_QueryInterface(mParent);
nsAutoString parentElementTag(NS_LITERAL_STRING("text node"));
if (parentElement)
parentElement->GetTagName(parentElementTag);
char *c, *p;
c = ToNewCString(elementTag);
p = ToNewCString(parentElementTag);
if (c&&p)
{
if (gNoisy)
printf(" DeleteElementTxn: inserting child %s back into parent %s\n", c, p);
NS_Free(c);
NS_Free(p);
}
// end debug output
#endif
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->InsertBefore(mElement, mRefNode, getter_AddRefs(resultNode));
}
NS_IMETHODIMP DeleteElementTxn::RedoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
printf("%p Redo Delete Element element = %p, parent = %p\n",
static_cast<void*>(this),
static_cast<void*>(mElement.get()),
static_cast<void*>(mParent.get()));
}
#endif
if (!mParent) { return NS_OK; } // this is a legal state, the txn is a no-op
if (!mElement) { return NS_ERROR_NULL_POINTER; }
if (mRangeUpdater)
mRangeUpdater->SelAdjDeleteNode(mElement);
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->RemoveChild(mElement, getter_AddRefs(resultNode));
}
NS_IMETHODIMP DeleteElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("DeleteElementTxn");
return NS_OK;
}