gecko/editor/libeditor/base/JoinElementTxn.cpp
Jonathan Watt 6380335603 Bug 767388 - Kill NS_DEBUG. r=bz.
--HG--
extra : rebase_source : d045208a26345712dbb4628c973c616cd9504f28
2012-06-25 20:59:42 +01:00

156 lines
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "JoinElementTxn.h"
#include "nsEditor.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMCharacterData.h"
#ifdef DEBUG
static bool gNoisy = false;
#endif
JoinElementTxn::JoinElementTxn()
: EditTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_CLASS(JoinElementTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(JoinElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mLeftNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mRightNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(JoinElementTxn, EditTxn)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mLeftNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mRightNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinElementTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
NS_IMETHODIMP JoinElementTxn::Init(nsEditor *aEditor,
nsIDOMNode *aLeftNode,
nsIDOMNode *aRightNode)
{
NS_PRECONDITION((aEditor && aLeftNode && aRightNode), "null arg");
if (!aEditor || !aLeftNode || !aRightNode) { return NS_ERROR_NULL_POINTER; }
mEditor = aEditor;
mLeftNode = do_QueryInterface(aLeftNode);
nsCOMPtr<nsIDOMNode>leftParent;
nsresult result = mLeftNode->GetParentNode(getter_AddRefs(leftParent));
NS_ENSURE_SUCCESS(result, result);
if (!mEditor->IsModifiableNode(leftParent)) {
return NS_ERROR_FAILURE;
}
mRightNode = do_QueryInterface(aRightNode);
mOffset=0;
return NS_OK;
}
// After DoTransaction() and RedoTransaction(), the left node is removed from the content tree and right node remains.
NS_IMETHODIMP JoinElementTxn::DoTransaction(void)
{
#ifdef DEBUG
if (gNoisy)
{
printf("%p Do Join of %p and %p\n",
static_cast<void*>(this),
static_cast<void*>(mLeftNode.get()),
static_cast<void*>(mRightNode.get()));
}
#endif
NS_PRECONDITION((mEditor && mLeftNode && mRightNode), "null arg");
if (!mEditor || !mLeftNode || !mRightNode) { return NS_ERROR_NOT_INITIALIZED; }
nsCOMPtr<nsINode> leftNode = do_QueryInterface(mLeftNode);
NS_ENSURE_STATE(leftNode);
nsCOMPtr<nsINode> rightNode = do_QueryInterface(mRightNode);
NS_ENSURE_STATE(rightNode);
// get the parent node
nsCOMPtr<nsINode> leftParent = leftNode->GetNodeParent();
NS_ENSURE_TRUE(leftParent, NS_ERROR_NULL_POINTER);
// verify that mLeftNode and mRightNode have the same parent
nsCOMPtr<nsINode> rightParent = rightNode->GetNodeParent();
NS_ENSURE_TRUE(rightParent, NS_ERROR_NULL_POINTER);
if (leftParent != rightParent) {
NS_ASSERTION(false, "2 nodes do not have same parent");
return NS_ERROR_INVALID_ARG;
}
// set this instance mParent.
// Other methods will see a non-null mParent and know all is well
mParent = leftParent->AsDOMNode();
mOffset = leftNode->Length();
nsresult rv = mEditor->JoinNodesImpl(mRightNode, mLeftNode, mParent, false);
#ifdef DEBUG
if (NS_SUCCEEDED(rv) && gNoisy) {
printf(" left node = %p removed\n", static_cast<void*>(mLeftNode.get()));
}
#endif
return rv;
}
//XXX: what if instead of split, we just deleted the unneeded children of mRight
// and re-inserted mLeft?
NS_IMETHODIMP JoinElementTxn::UndoTransaction(void)
{
#ifdef DEBUG
if (gNoisy)
{
printf("%p Undo Join, right node = %p\n",
static_cast<void*>(this),
static_cast<void*>(mRightNode.get()));
}
#endif
NS_ASSERTION(mRightNode && mLeftNode && mParent, "bad state");
if (!mRightNode || !mLeftNode || !mParent) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result;
nsCOMPtr<nsIDOMNode>resultNode;
// first, massage the existing node so it is in its post-split state
nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mRightNode);
if (rightNodeAsText)
{
result = rightNodeAsText->DeleteData(0, mOffset);
}
else
{
nsCOMPtr<nsIDOMNode>child;
result = mRightNode->GetFirstChild(getter_AddRefs(child));
nsCOMPtr<nsIDOMNode>nextSibling;
PRUint32 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 = mLeftNode->AppendChild(child, getter_AddRefs(resultNode));
child = do_QueryInterface(nextSibling);
}
}
// second, re-insert the left node into the tree
result = mParent->InsertBefore(mLeftNode, mRightNode, getter_AddRefs(resultNode));
return result;
}
NS_IMETHODIMP JoinElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("JoinElementTxn");
return NS_OK;
}