gecko/editor/libeditor/base/CreateElementTxn.cpp

239 lines
7.7 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
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#include "CreateElementTxn.h"
#include "nsEditor.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNodeList.h"
#include "nsISelection.h"
#include "nsIDOMText.h"
#include "nsIDOMElement.h"
#include "nsReadableUtils.h"
//included for new nsEditor::CreateContent()
#include "nsIContent.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
CreateElementTxn::CreateElementTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_CLASS(CreateElementTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(CreateElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mNewNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mRefNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CreateElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mNewNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mRefNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CreateElementTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP CreateElementTxn::Init(nsEditor *aEditor,
const nsAString &aTag,
nsIDOMNode *aParent,
PRUint32 aOffsetInParent)
{
NS_ASSERTION(aEditor&&aParent, "null args");
if (!aEditor || !aParent) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mTag = aTag;
mParent = do_QueryInterface(aParent);
mOffsetInParent = aOffsetInParent;
#ifdef NS_DEBUG
{
nsCOMPtr<nsIDOMNodeList> testChildNodes;
nsresult testResult = mParent->GetChildNodes(getter_AddRefs(testChildNodes));
NS_ASSERTION(testChildNodes, "bad parent type, can't have children.");
NS_ASSERTION(NS_SUCCEEDED(testResult), "bad result.");
}
#endif
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
char* nodename = ToNewCString(mTag);
printf("Do Create Element parent = %p <%s>, offset = %d\n",
static_cast<void*>(mParent.get()), nodename, mOffsetInParent);
nsMemory::Free(nodename);
}
#endif
NS_ASSERTION(mEditor && mParent, "bad state");
if (!mEditor || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIContent> newContent;
//new call to use instead to get proper HTML element, bug# 39919
nsresult result = mEditor->CreateHTMLContent(mTag, getter_AddRefs(newContent));
if (NS_FAILED(result)) return result;
nsCOMPtr<nsIDOMElement>newElement = do_QueryInterface(newContent);
if (!newElement) return NS_ERROR_NULL_POINTER;
mNewNode = do_QueryInterface(newElement);
// Try to insert formatting whitespace for the new node:
mEditor->MarkNodeDirty(mNewNode);
NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewNode)), "could not create element.");
if (!mNewNode) return NS_ERROR_NULL_POINTER;
#ifdef NS_DEBUG
if (gNoisy)
{
printf(" newNode = %p\n", static_cast<void*>(mNewNode.get()));
}
#endif
// insert the new node
nsCOMPtr<nsIDOMNode> resultNode;
if (CreateElementTxn::eAppend==(PRInt32)mOffsetInParent)
{
result = mParent->AppendChild(mNewNode, getter_AddRefs(resultNode));
}
else
{
nsCOMPtr<nsIDOMNodeList> childNodes;
result = mParent->GetChildNodes(getter_AddRefs(childNodes));
if ((NS_SUCCEEDED(result)) && (childNodes))
{
PRUint32 count;
childNodes->GetLength(&count);
if (mOffsetInParent>count)
mOffsetInParent = count;
result = childNodes->Item(mOffsetInParent, getter_AddRefs(mRefNode));
if (NS_FAILED(result)) return result; // note, it's ok for mRefNode to be null. that means append
result = mParent->InsertBefore(mNewNode, mRefNode, getter_AddRefs(resultNode));
if (NS_FAILED(result)) return result;
// 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;
PRInt32 offset=0;
result = nsEditor::GetChildOffset(mNewNode, mParent, offset);
if (NS_FAILED(result)) return result;
result = selection->Collapse(mParent, offset+1);
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after insert.");
}
else
{
// do nothing - dom range gravity will adjust selection
}
}
}
return result;
}
NS_IMETHODIMP CreateElementTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
printf("Undo Create Element, mParent = %p, node = %p\n",
static_cast<void*>(mParent.get()),
static_cast<void*>(mNewNode.get()));
}
#endif
NS_ASSERTION(mEditor && mParent, "bad state");
if (!mEditor || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->RemoveChild(mNewNode, getter_AddRefs(resultNode));
}
NS_IMETHODIMP CreateElementTxn::RedoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Redo Create Element\n"); }
#endif
NS_ASSERTION(mEditor && mParent, "bad state");
if (!mEditor || !mParent) return NS_ERROR_NOT_INITIALIZED;
// first, reset mNewNode so it has no attributes or content
nsCOMPtr<nsIDOMCharacterData>nodeAsText = do_QueryInterface(mNewNode);
if (nodeAsText)
{
nodeAsText->SetData(EmptyString());
}
// now, reinsert mNewNode
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->InsertBefore(mNewNode, mRefNode, getter_AddRefs(resultNode));
}
NS_IMETHODIMP CreateElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("CreateElementTxn: ");
aString += mTag;
return NS_OK;
}
NS_IMETHODIMP CreateElementTxn::GetNewNode(nsIDOMNode **aNewNode)
{
if (!aNewNode)
return NS_ERROR_NULL_POINTER;
if (!mNewNode)
return NS_ERROR_NOT_INITIALIZED;
*aNewNode = mNewNode;
NS_ADDREF(*aNewNode);
return NS_OK;
}