gecko/editor/libeditor/base/SetDocTitleTxn.cpp

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/* -*- 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):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* 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 "SetDocTitleTxn.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMDocument.h"
#include "nsIDOMHTMLDocument.h"
#include "nsIDOMText.h"
#include "nsIDOMElement.h"
// note that aEditor is not refcounted
SetDocTitleTxn::SetDocTitleTxn()
: EditTxn()
, mIsTransient(false)
{
}
NS_IMETHODIMP SetDocTitleTxn::Init(nsIHTMLEditor *aEditor,
const nsAString *aValue)
{
NS_ASSERTION(aEditor && aValue, "null args");
if (!aEditor || !aValue) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mValue = *aValue;
return NS_OK;
}
NS_IMETHODIMP SetDocTitleTxn::DoTransaction(void)
{
return SetDomTitle(mValue);
}
NS_IMETHODIMP SetDocTitleTxn::UndoTransaction(void)
{
// No extra work required; the DOM changes alone are enough
return NS_OK;
}
NS_IMETHODIMP SetDocTitleTxn::RedoTransaction(void)
{
// No extra work required; the DOM changes alone are enough
return NS_OK;
}
nsresult SetDocTitleTxn::SetDomTitle(const nsAString& aTitle)
{
nsCOMPtr<nsIEditor> editor = do_QueryInterface(mEditor);
NS_ENSURE_TRUE(editor, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMDocument> domDoc;
nsresult res = editor->GetDocument(getter_AddRefs(domDoc));
NS_ENSURE_TRUE(domDoc, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMNodeList> titleList;
res = domDoc->GetElementsByTagName(NS_LITERAL_STRING("title"), getter_AddRefs(titleList));
NS_ENSURE_SUCCESS(res, res);
// First assume we will NOT really do anything
// (transaction will not be pushed on stack)
mIsTransient = true;
nsCOMPtr<nsIDOMNode>titleNode;
if(titleList)
{
res = titleList->Item(0, getter_AddRefs(titleNode));
NS_ENSURE_SUCCESS(res, res);
if (titleNode)
{
// Delete existing child textnode of title node
// (Note: all contents under a TITLE node are always in a single text node)
nsCOMPtr<nsIDOMNode> child;
res = titleNode->GetFirstChild(getter_AddRefs(child));
if(NS_FAILED(res)) return res;
if(child)
{
// Save current text as the undo value
nsCOMPtr<nsIDOMCharacterData> textNode = do_QueryInterface(child);
if(textNode)
{
textNode->GetData(mUndoValue);
// If title text is identical to what already exists,
// quit now (mIsTransient is now TRUE)
if (mUndoValue == aTitle)
return NS_OK;
}
res = editor->DeleteNode(child);
if(NS_FAILED(res)) return res;
}
}
}
// We didn't return above, thus we really will be changing the title
mIsTransient = false;
// Get the <HEAD> node, create a <TITLE> and insert it under the HEAD
nsCOMPtr<nsIDOMNodeList> headList;
res = domDoc->GetElementsByTagName(NS_LITERAL_STRING("head"),getter_AddRefs(headList));
NS_ENSURE_SUCCESS(res, res);
NS_ENSURE_TRUE(headList, NS_ERROR_FAILURE);
nsCOMPtr<nsIDOMNode>headNode;
headList->Item(0, getter_AddRefs(headNode));
NS_ENSURE_TRUE(headNode, NS_ERROR_FAILURE);
bool newTitleNode = false;
PRUint32 newTitleIndex = 0;
if (!titleNode)
{
// Didn't find one above: Create a new one
nsCOMPtr<nsIDOMElement>titleElement;
res = domDoc->CreateElement(NS_LITERAL_STRING("title"), getter_AddRefs(titleElement));
NS_ENSURE_SUCCESS(res, res);
NS_ENSURE_TRUE(titleElement, NS_ERROR_FAILURE);
titleNode = do_QueryInterface(titleElement);
newTitleNode = true;
// Get index so we append new title node
// after all existing HEAD children
nsCOMPtr<nsIDOMNodeList> children;
res = headNode->GetChildNodes(getter_AddRefs(children));
NS_ENSURE_SUCCESS(res, res);
if (children)
children->GetLength(&newTitleIndex);
}
// Append a text node under the TITLE
// only if the title text isn't empty
if (titleNode && !aTitle.IsEmpty())
{
nsCOMPtr<nsIDOMText> textNode;
res = domDoc->CreateTextNode(aTitle, getter_AddRefs(textNode));
NS_ENSURE_SUCCESS(res, res);
nsCOMPtr<nsIDOMNode> newNode = do_QueryInterface(textNode);
NS_ENSURE_TRUE(newNode, NS_ERROR_FAILURE);
if (newTitleNode)
{
// Not undoable: We will insert newTitleNode below
nsCOMPtr<nsIDOMNode> resultNode;
res = titleNode->AppendChild(newNode, getter_AddRefs(resultNode));
}
else
{
// This is an undoable transaction
res = editor->InsertNode(newNode, titleNode, 0);
}
NS_ENSURE_SUCCESS(res, res);
}
if (newTitleNode)
{
// Undoable transaction to insert title+text together
res = editor->InsertNode(titleNode, headNode, newTitleIndex);
}
return res;
}
NS_IMETHODIMP SetDocTitleTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("SetDocTitleTxn: ");
aString += mValue;
return NS_OK;
}
NS_IMETHODIMP SetDocTitleTxn::GetIsTransient(bool *aIsTransient)
{
NS_ENSURE_TRUE(aIsTransient, NS_ERROR_NULL_POINTER);
*aIsTransient = mIsTransient;
return NS_OK;
}