gecko-dev/editor/libeditor/DeleteNodeTxn.cpp

120 строки
2.9 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 "DeleteNodeTxn.h"
#include "nsDebug.h"
#include "nsEditor.h"
#include "nsError.h"
#include "nsSelectionState.h" // nsRangeUpdater
#include "nsAString.h"
using namespace mozilla;
DeleteNodeTxn::DeleteNodeTxn()
: EditTxn(), mNode(), mParent(), mRefNode(), mRangeUpdater(nullptr)
{
}
DeleteNodeTxn::~DeleteNodeTxn()
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTxn, EditTxn,
mNode,
mParent,
mRefNode)
NS_IMPL_ADDREF_INHERITED(DeleteNodeTxn, EditTxn)
NS_IMPL_RELEASE_INHERITED(DeleteNodeTxn, EditTxn)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
nsresult
DeleteNodeTxn::Init(nsEditor* aEditor, nsINode* aNode,
nsRangeUpdater* aRangeUpdater)
{
NS_ENSURE_TRUE(aEditor && aNode, NS_ERROR_NULL_POINTER);
mEditor = aEditor;
mNode = aNode;
mParent = aNode->GetParentNode();
// do nothing if the node has a parent and it's read-only
NS_ENSURE_TRUE(!mParent || mEditor->IsModifiableNode(mParent),
NS_ERROR_FAILURE);
mRangeUpdater = aRangeUpdater;
return NS_OK;
}
NS_IMETHODIMP
DeleteNodeTxn::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 nsRangeStore update
// methods.
if (mRangeUpdater) {
mRangeUpdater->SelAdjDeleteNode(mNode->AsDOMNode());
}
ErrorResult error;
mParent->RemoveChild(*mNode, error);
return error.StealNSResult();
}
NS_IMETHODIMP
DeleteNodeTxn::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;
mParent->InsertBefore(*mNode, mRefNode, error);
return error.StealNSResult();
}
NS_IMETHODIMP
DeleteNodeTxn::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
DeleteNodeTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("DeleteNodeTxn");
return NS_OK;
}