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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 "DeleteNodeTransaction.h"
#include "mozilla/EditorBase.h"
#include "mozilla/SelectionState.h" // RangeUpdater
#include "nsDebug.h"
#include "nsError.h"
#include "nsAString.h"
namespace mozilla {
DeleteNodeTransaction::DeleteNodeTransaction()
: mEditorBase(nullptr)
, mRangeUpdater(nullptr)
{
}
DeleteNodeTransaction::~DeleteNodeTransaction()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTransaction, EditTransactionBase,
mNode,
mParent,
mRefNode)
NS_IMPL_ADDREF_INHERITED(DeleteNodeTransaction, EditTransactionBase)
NS_IMPL_RELEASE_INHERITED(DeleteNodeTransaction, EditTransactionBase)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
nsresult
DeleteNodeTransaction::Init(EditorBase* aEditorBase,
nsINode* aNode,
RangeUpdater* aRangeUpdater)
{
NS_ENSURE_TRUE(aEditorBase && aNode, NS_ERROR_NULL_POINTER);
mEditorBase = aEditorBase;
mNode = aNode;
mParent = aNode->GetParentNode();
// do nothing if the node has a parent and it's read-only
NS_ENSURE_TRUE(!mParent || mEditorBase->IsModifiableNode(mParent),
NS_ERROR_FAILURE);
mRangeUpdater = aRangeUpdater;
return NS_OK;
}
NS_IMETHODIMP
DeleteNodeTransaction::DoTransaction()
{
NS_ENSURE_TRUE(mNode, NS_ERROR_NOT_INITIALIZED);
if (!mParent) {
// this is a no-op, there's no parent to delete mNode from
return NS_OK;
}
// remember which child mNode was (by remembering which child was next);
// mRefNode can be null
mRefNode = mNode->GetNextSibling();
// give range updater a chance. SelAdjDeleteNode() needs to be called
// *before* we do the action, unlike some of the other RangeItem update
// methods.
if (mRangeUpdater) {
mRangeUpdater->SelAdjDeleteNode(mNode->AsDOMNode());
}
ErrorResult error;
mParent->RemoveChild(*mNode, error);
return error.StealNSResult();
}
NS_IMETHODIMP
DeleteNodeTransaction::UndoTransaction()
{
if (!mParent) {
// this is a legal state, the txn is a no-op
return NS_OK;
}
if (!mNode) {
return NS_ERROR_NULL_POINTER;
}
ErrorResult error;
nsCOMPtr<nsIContent> refNode = mRefNode;
mParent->InsertBefore(*mNode, refNode, error);
return error.StealNSResult();
}
NS_IMETHODIMP
DeleteNodeTransaction::RedoTransaction()
{
if (!mParent) {
// this is a legal state, the txn is a no-op
return NS_OK;
}
if (!mNode) {
return NS_ERROR_NULL_POINTER;
}
if (mRangeUpdater) {
mRangeUpdater->SelAdjDeleteNode(mNode->AsDOMNode());
}
ErrorResult error;
mParent->RemoveChild(*mNode, error);
return error.StealNSResult();
}
NS_IMETHODIMP
DeleteNodeTransaction::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("DeleteNodeTransaction");
return NS_OK;
}
} // namespace mozilla
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