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/* -*- 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 "SplitNodeTransaction.h"
#include "mozilla/EditorBase.h" // for EditorBase
#include "mozilla/dom/Selection.h"
#include "nsAString.h"
#include "nsDebug.h" // for NS_ASSERTION, etc.
#include "nsError.h" // for NS_ERROR_NOT_INITIALIZED, etc.
#include "nsIContent.h" // for nsIContent
namespace mozilla {
using namespace dom;
SplitNodeTransaction::SplitNodeTransaction(EditorBase& aEditorBase,
nsIContent& aNode,
int32_t aOffset)
: mEditorBase(aEditorBase)
, mExistingRightNode(&aNode)
, mOffset(aOffset)
{
}
SplitNodeTransaction::~SplitNodeTransaction()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitNodeTransaction, EditTransactionBase,
mParent,
mNewLeftNode)
NS_IMPL_ADDREF_INHERITED(SplitNodeTransaction, EditTransactionBase)
NS_IMPL_RELEASE_INHERITED(SplitNodeTransaction, EditTransactionBase)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitNodeTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
NS_IMETHODIMP
SplitNodeTransaction::DoTransaction()
{
// Create a new node
ErrorResult rv;
// Don't use .downcast directly because AsContent has an assertion we want
nsCOMPtr<nsINode> clone = mExistingRightNode->CloneNode(false, rv);
NS_ASSERTION(!rv.Failed() && clone, "Could not create clone");
NS_ENSURE_TRUE(!rv.Failed() && clone, rv.StealNSResult());
mNewLeftNode = dont_AddRef(clone.forget().take()->AsContent());
mEditorBase.MarkNodeDirty(mExistingRightNode->AsDOMNode());
// Get the parent node
mParent = mExistingRightNode->GetParentNode();
NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
// Insert the new node
rv = mEditorBase.SplitNodeImpl(*mExistingRightNode, mOffset, *mNewLeftNode);
if (mEditorBase.GetShouldTxnSetSelection()) {
RefPtr<Selection> selection = mEditorBase.GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
rv = selection->Collapse(mNewLeftNode, mOffset);
}
return rv.StealNSResult();
}
NS_IMETHODIMP
SplitNodeTransaction::UndoTransaction()
{
MOZ_ASSERT(mNewLeftNode && mParent);
// This assumes Do inserted the new node in front of the prior existing node
return mEditorBase.JoinNodesImpl(mExistingRightNode, mNewLeftNode, mParent);
}
/* 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
SplitNodeTransaction::RedoTransaction()
{
MOZ_ASSERT(mNewLeftNode && mParent);
ErrorResult rv;
// First, massage the existing node so it is in its post-split state
if (mExistingRightNode->GetAsText()) {
rv = mExistingRightNode->GetAsText()->DeleteData(0, mOffset);
NS_ENSURE_TRUE(!rv.Failed(), rv.StealNSResult());
} else {
nsCOMPtr<nsIContent> child = mExistingRightNode->GetFirstChild();
nsCOMPtr<nsIContent> nextSibling;
for (int32_t i=0; i < mOffset; i++) {
if (rv.Failed()) {
return rv.StealNSResult();
}
if (!child) {
return NS_ERROR_NULL_POINTER;
}
nextSibling = child->GetNextSibling();
mExistingRightNode->RemoveChild(*child, rv);
if (!rv.Failed()) {
mNewLeftNode->AppendChild(*child, rv);
}
child = nextSibling;
}
}
// Second, re-insert the left node into the tree
nsCOMPtr<nsIContent> refNode = mExistingRightNode;
mParent->InsertBefore(*mNewLeftNode, refNode, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
SplitNodeTransaction::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("SplitNodeTransaction");
return NS_OK;
}
nsIContent*
SplitNodeTransaction::GetNewNode()
{
return mNewLeftNode;
}
} // namespace mozilla
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