gecko-dev/editor/libeditor/base/SplitElementTxn.cpp
2011-10-17 10:59:28 -04:00

277 lines
8.9 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
* 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 "SplitElementTxn.h"
#include "nsEditor.h"
#include "nsIDOMNode.h"
#include "nsISelection.h"
#include "nsIDOMCharacterData.h"
#ifdef NS_DEBUG
static bool gNoisy = false;
#endif
// note that aEditor is not refcounted
SplitElementTxn::SplitElementTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_CLASS(SplitElementTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SplitElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mNewLeftNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SplitElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mNewLeftNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ADDREF_INHERITED(SplitElementTxn, EditTxn)
NS_IMPL_RELEASE_INHERITED(SplitElementTxn, EditTxn)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitElementTxn)
NS_INTERFACE_MAP_END_INHERITING(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",
static_cast<void*>(this),
static_cast<void*>(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(false, getter_AddRefs(mNewLeftNode));
NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NULL_POINTER);
mEditor->MarkNodeDirty(mExistingRightNode);
#ifdef NS_DEBUG
if (gNoisy)
{
printf(" created left node = %p\n",
static_cast<void*>(mNewLeftNode.get()));
}
#endif
// get the parent node
result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
// insert the new node
result = mEditor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
if (mNewLeftNode) {
bool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection)
{
nsCOMPtr<nsISelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
result = selection->Collapse(mNewLeftNode, mOffset);
}
else
{
// do nothing - dom range gravity will adjust selection
}
}
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",
static_cast<void*>(this),
static_cast<void*>(mExistingRightNode.get()),
static_cast<void*>(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, false);
#ifdef NS_DEBUG
if (gNoisy)
{
printf("** after join left child node %p into right node %p\n",
static_cast<void*>(mNewLeftNode.get()),
static_cast<void*>(mExistingRightNode.get()));
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
if (NS_SUCCEEDED(result))
{
if (gNoisy)
{
printf(" left node = %p removed\n",
static_cast<void*>(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",
static_cast<void*>(this),
static_cast<void*>(mExistingRightNode.get()),
static_cast<void*>(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",
static_cast<void*>(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",
static_cast<void*>(child.get()),
static_cast<void*>(mExistingRightNode.get()),
static_cast<void*>(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",
static_cast<void*>(mNewLeftNode.get()),
static_cast<void*>(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)
{
NS_ENSURE_TRUE(aNewNode, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NOT_INITIALIZED);
*aNewNode = mNewLeftNode;
NS_ADDREF(*aNewNode);
return NS_OK;
}