gecko-dev/editor/base/InsertElementTxn.cpp

162 строки
4.6 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 "InsertElementTxn.h"
#include "nsIDOMSelection.h"
#include "nsIContent.h"
#include "nsIDOMNodeList.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
InsertElementTxn::InsertElementTxn()
: EditTxn()
{
SetTransactionDescriptionID( kTransactionID );
/* log description initialized in parent constructor */
}
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::Do(void)
{
if (gNoisy)
{
nsCOMPtr<nsIContent>nodeAsContent = do_QueryInterface(mNode);
nsCOMPtr<nsIContent>parentAsContent = do_QueryInterface(mParent);
nsString namestr;
mNode->GetNodeName(namestr);
char* nodename = namestr.ToNewCString();
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);
}
if (!mNode || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIDOMNodeList> childNodes;
nsCOMPtr<nsIDOMNode>refNode;
nsresult result = mParent->GetChildNodes(getter_AddRefs(childNodes));
if (NS_FAILED(result)) return result;
if (childNodes)
{
PRUint32 count;
childNodes->GetLength(&count);
if (mOffset>count) 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<nsIDOMSelection> 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::Undo(void)
{
if (gNoisy) { printf("%p Undo Insert Element of %p into parent %p at offset %d\n",
this, mNode.get(), mParent.get(), mOffset); }
if (!mNode || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIDOMNode> resultNode;
nsresult result = mParent->RemoveChild(mNode, getter_AddRefs(resultNode));
return result;
}
NS_IMETHODIMP InsertElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
aString->AssignWithConversion("Remove Element: ");
}
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
aString->AssignWithConversion("Insert Element: ");
}
return NS_OK;
}