gecko-dev/editor/libeditor/DeleteNodeTransaction.cpp

111 строки
3.2 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 "DeleteNodeTransaction.h"
#include "mozilla/EditorBase.h"
#include "mozilla/SelectionState.h" // RangeUpdater
#include "nsDebug.h"
#include "nsError.h"
#include "nsAString.h"
namespace mozilla {
// static
already_AddRefed<DeleteNodeTransaction>
DeleteNodeTransaction::MaybeCreate(EditorBase& aEditorBase,
nsINode& aNodeToDelete)
{
RefPtr<DeleteNodeTransaction> transaction =
new DeleteNodeTransaction(aEditorBase, aNodeToDelete);
if (NS_WARN_IF(!transaction->CanDoIt())) {
return nullptr;
}
return transaction.forget();
}
DeleteNodeTransaction::DeleteNodeTransaction(EditorBase& aEditorBase,
nsINode& aNodeToDelete)
: mEditorBase(&aEditorBase)
, mNodeToDelete(&aNodeToDelete)
, mParentNode(aNodeToDelete.GetParentNode())
{
}
DeleteNodeTransaction::~DeleteNodeTransaction()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTransaction, EditTransactionBase,
mEditorBase,
mNodeToDelete,
mParentNode,
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)
bool
DeleteNodeTransaction::CanDoIt() const
{
if (NS_WARN_IF(!mNodeToDelete) || NS_WARN_IF(!mEditorBase) ||
!mParentNode || !mEditorBase->IsModifiableNode(mParentNode)) {
return false;
}
return true;
}
NS_IMETHODIMP
DeleteNodeTransaction::DoTransaction()
{
if (NS_WARN_IF(!CanDoIt())) {
return NS_OK;
}
// Remember which child mNodeToDelete was (by remembering which child was
// next). Note that mRefNode can be nullptr.
mRefNode = mNodeToDelete->GetNextSibling();
// give range updater a chance. SelAdjDeleteNode() needs to be called
// *before* we do the action, unlike some of the other RangeItem update
// methods.
mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(mNodeToDelete);
ErrorResult error;
mParentNode->RemoveChild(*mNodeToDelete, error);
return error.StealNSResult();
}
NS_IMETHODIMP
DeleteNodeTransaction::UndoTransaction()
{
if (NS_WARN_IF(!CanDoIt())) {
// This is a legal state, the transaction is a no-op.
return NS_OK;
}
ErrorResult error;
nsCOMPtr<nsIContent> refNode = mRefNode;
mParentNode->InsertBefore(*mNodeToDelete, refNode, error);
return error.StealNSResult();
}
NS_IMETHODIMP
DeleteNodeTransaction::RedoTransaction()
{
if (NS_WARN_IF(!CanDoIt())) {
// This is a legal state, the transaction is a no-op.
return NS_OK;
}
mEditorBase->RangeUpdaterRef().SelAdjDeleteNode(mNodeToDelete);
ErrorResult error;
mParentNode->RemoveChild(*mNodeToDelete, error);
return error.StealNSResult();
}
} // namespace mozilla