gecko/editor/libeditor/base/SplitElementTxn.cpp

228 lines
7.5 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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* decision by deleting the provisions above and replace them with the notice
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* ***** END LICENSE BLOCK ***** */
#include "SplitElementTxn.h"
#include "nsEditor.h"
#include "nsIDOMNode.h"
#include "nsISelection.h"
#include "nsIDOMCharacterData.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
// note that aEditor is not refcounted
SplitElementTxn::SplitElementTxn()
: EditTxn()
{
}
NS_IMETHODIMP SplitElementTxn::Init(nsEditor *aEditor,
nsIDOMNode *aNode,
PRInt32 aOffset)
{
NS_ASSERTION(aEditor && aNode, "bad args");
if (!aEditor || !aNode) { return NS_ERROR_NOT_INITIALIZED; }
mEditor = aEditor;
mExistingRightNode = do_QueryInterface(aNode);
mOffset = aOffset;
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("%p Do Split of node %p offset %d\n", this, mExistingRightNode.get(), mOffset); }
#endif
NS_ASSERTION(mExistingRightNode && mEditor, "bad state");
if (!mExistingRightNode || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
// create a new node
nsresult result = mExistingRightNode->CloneNode(PR_FALSE, getter_AddRefs(mNewLeftNode));
NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
if (NS_FAILED(result)) return result;
if (!mNewLeftNode) return NS_ERROR_NULL_POINTER;
mEditor->MarkNodeDirty(mExistingRightNode);
#ifdef NS_DEBUG
if (gNoisy) { printf(" created left node = %p\n", mNewLeftNode.get()); }
#endif
// get the parent node
result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
if (NS_FAILED(result)) return result;
if (!mParent) return NS_ERROR_NULL_POINTER;
// insert the new node
result = mEditor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
if (NS_SUCCEEDED(result) && mNewLeftNode)
{
nsCOMPtr<nsISelection>selection;
mEditor->GetSelection(getter_AddRefs(selection));
if (NS_FAILED(result)) return result;
if (!selection) return NS_ERROR_NULL_POINTER;
result = selection->Collapse(mNewLeftNode, mOffset);
}
else {
result = NS_ERROR_NOT_IMPLEMENTED;
}
return result;
}
NS_IMETHODIMP SplitElementTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) {
printf("%p Undo Split of existing node %p and new node %p offset %d\n",
this, mExistingRightNode.get(), mNewLeftNode.get(), mOffset);
}
#endif
NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
return NS_ERROR_NOT_INITIALIZED;
}
// this assumes Do inserted the new node in front of the prior existing node
nsresult result = mEditor->JoinNodesImpl(mExistingRightNode, mNewLeftNode, mParent, PR_FALSE);
#ifdef NS_DEBUG
if (gNoisy)
{
printf("** after join left child node %p into right node %p\n", mNewLeftNode.get(), mExistingRightNode.get());
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
if (NS_SUCCEEDED(result))
{
if (gNoisy) { printf(" left node = %p removed\n", mNewLeftNode.get()); }
}
#endif
return result;
}
/* redo cannot simply resplit the right node, because subsequent transactions
* on the redo stack may depend on the left node existing in its previous state.
*/
NS_IMETHODIMP SplitElementTxn::RedoTransaction(void)
{
NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
return NS_ERROR_NOT_INITIALIZED;
}
#ifdef NS_DEBUG
if (gNoisy) {
printf("%p Redo Split of existing node %p and new node %p offset %d\n",
this, mExistingRightNode.get(), mNewLeftNode.get(), mOffset);
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
#endif
nsresult result;
nsCOMPtr<nsIDOMNode>resultNode;
// first, massage the existing node so it is in its post-split state
nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mExistingRightNode);
if (rightNodeAsText)
{
result = rightNodeAsText->DeleteData(0, mOffset);
#ifdef NS_DEBUG
if (gNoisy)
{
printf("** after delete of text in right text node %p offset %d\n", rightNodeAsText.get(), mOffset);
mEditor->DebugDumpContent(); // DEBUG
}
#endif
}
else
{
nsCOMPtr<nsIDOMNode>child;
nsCOMPtr<nsIDOMNode>nextSibling;
result = mExistingRightNode->GetFirstChild(getter_AddRefs(child));
PRInt32 i;
for (i=0; i<mOffset; i++)
{
if (NS_FAILED(result)) {return result;}
if (!child) {return NS_ERROR_NULL_POINTER;}
child->GetNextSibling(getter_AddRefs(nextSibling));
result = mExistingRightNode->RemoveChild(child, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result))
{
result = mNewLeftNode->AppendChild(child, getter_AddRefs(resultNode));
#ifdef NS_DEBUG
if (gNoisy)
{
printf("** move child node %p from right node %p to left node %p\n", child.get(), mExistingRightNode.get(), mNewLeftNode.get());
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
#endif
}
child = do_QueryInterface(nextSibling);
}
}
// second, re-insert the left node into the tree
result = mParent->InsertBefore(mNewLeftNode, mExistingRightNode, getter_AddRefs(resultNode));
#ifdef NS_DEBUG
if (gNoisy)
{
printf("** reinsert left child node %p before right node %p\n", mNewLeftNode.get(), mExistingRightNode.get());
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
#endif
return result;
}
NS_IMETHODIMP SplitElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("SplitElementTxn");
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::GetNewNode(nsIDOMNode **aNewNode)
{
if (!aNewNode)
return NS_ERROR_NULL_POINTER;
if (!mNewLeftNode)
return NS_ERROR_NOT_INITIALIZED;
*aNewNode = mNewLeftNode;
NS_ADDREF(*aNewNode);
return NS_OK;
}