RetroZilla/editor/libeditor/base/InsertElementTxn.cpp

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2015-10-21 05:03:22 +02:00
/* -*- 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 "InsertElementTxn.h"
#include "nsISelection.h"
#include "nsIContent.h"
#include "nsIDOMNodeList.h"
#include "nsReadableUtils.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
InsertElementTxn::InsertElementTxn()
: EditTxn()
{
}
NS_IMETHODIMP InsertElementTxn::Init(nsIDOMNode *aNode,
nsIDOMNode *aParent,
PRInt32 aOffset,
nsIEditor *aEditor)
{
NS_ASSERTION(aNode && aParent && aEditor, "bad arg");
if (!aNode || !aParent || !aEditor)
return NS_ERROR_NULL_POINTER;
mNode = do_QueryInterface(aNode);
mParent = do_QueryInterface(aParent);
mOffset = aOffset;
mEditor = aEditor;
if (!mNode || !mParent || !mEditor)
return NS_ERROR_INVALID_ARG;
return NS_OK;
}
InsertElementTxn::~InsertElementTxn()
{
}
NS_IMETHODIMP InsertElementTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
nsCOMPtr<nsIContent>nodeAsContent = do_QueryInterface(mNode);
nsCOMPtr<nsIContent>parentAsContent = do_QueryInterface(mParent);
nsString namestr;
mNode->GetNodeName(namestr);
char* nodename = ToNewCString(namestr);
printf("%p Do Insert Element of %p <%s> into parent %p at offset %d\n",
this, nodeAsContent.get(), nodename,
parentAsContent.get(), mOffset);
nsMemory::Free(nodename);
}
#endif
if (!mNode || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIDOMNodeList> childNodes;
nsresult result = mParent->GetChildNodes(getter_AddRefs(childNodes));
if (NS_FAILED(result)) return result;
nsCOMPtr<nsIDOMNode>refNode;
if (childNodes)
{
PRUint32 count;
childNodes->GetLength(&count);
if (mOffset>(PRInt32)count) mOffset = count;
// -1 is sentinel value meaning "append at end"
if (mOffset == -1) mOffset = count;
result = childNodes->Item(mOffset, getter_AddRefs(refNode));
if (NS_FAILED(result)) return result;
// note, it's ok for mRefNode to be null. that means append
}
mEditor->MarkNodeDirty(mNode);
nsCOMPtr<nsIDOMNode> resultNode;
result = mParent->InsertBefore(mNode, refNode, getter_AddRefs(resultNode));
if (NS_FAILED(result)) return result;
if (!resultNode) return NS_ERROR_NULL_POINTER;
// only set selection to insertion point if editor gives permission
PRBool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection)
{
nsCOMPtr<nsISelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_FAILED(result)) return result;
if (!selection) return NS_ERROR_NULL_POINTER;
// place the selection just after the inserted element
selection->Collapse(mParent, mOffset+1);
}
else
{
// do nothing - dom range gravity will adjust selection
}
return result;
}
NS_IMETHODIMP InsertElementTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("%p Undo Insert Element of %p into parent %p at offset %d\n",
this, mNode.get(), mParent.get(), mOffset); }
#endif
if (!mNode || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->RemoveChild(mNode, getter_AddRefs(resultNode));
}
NS_IMETHODIMP InsertElementTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
if (aDidMerge)
*aDidMerge = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("InsertElementTxn");
return NS_OK;
}