gecko-dev/editor/base/InsertElementTxn.cpp

149 lines
4.0 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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "InsertElementTxn.h"
#include "nsIDOMSelection.h"
#include "nsIContent.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const 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::Do(void)
{
if (gNoisy)
{
nsCOMPtr<nsIContent>nodeAsContent = do_QueryInterface(mNode);
nsCOMPtr<nsIContent>parentAsContent = do_QueryInterface(mParent);
printf("%p Do Insert Element of %p into parent %p at offset %d\n",
this, nodeAsContent.get(), parentAsContent.get(), mOffset);
}
if (!mNode || !mParent)
return NS_ERROR_NULL_POINTER;
nsresult result;
nsCOMPtr<nsIDOMNode>refNode;
//if (0!=mOffset)
{ // get a ref node
PRInt32 i=0;
result = mParent->GetFirstChild(getter_AddRefs(refNode));
if (NS_SUCCEEDED(result) && refNode)
{
for (; i<mOffset; i++)
{
nsCOMPtr<nsIDOMNode>nextSib;
result = refNode->GetNextSibling(getter_AddRefs(nextSib));
if (NS_FAILED(result)) {
break; // couldn't get a next sibling, so make aNode the first child
}
refNode = do_QueryInterface(nextSib);
if (!refNode) {
break; // couldn't get a next sibling, so make aNode the first child
}
}
}
}
nsCOMPtr<nsIDOMNode> resultNode;
result = mParent->InsertBefore(mNode, refNode, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result) && resultNode)
{
nsCOMPtr<nsIDOMSelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if ((NS_SUCCEEDED(result)) && selection)
{ // place the selection just after the inserted element
selection->Collapse(mParent, mOffset+1);
//selection->Extend(mParent, mOffset+1);
}
}
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_NULL_POINTER;
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="Remove Element: ";
}
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Insert Element: ";
}
return NS_OK;
}