зеркало из https://github.com/mozilla/gecko-dev.git
120 строки
2.9 KiB
C++
120 строки
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "DeleteNodeTxn.h"
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#include "nsDebug.h"
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#include "nsEditor.h"
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#include "nsError.h"
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#include "nsSelectionState.h" // nsRangeUpdater
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#include "nsAString.h"
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using namespace mozilla;
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DeleteNodeTxn::DeleteNodeTxn()
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: EditTxn(), mNode(), mParent(), mRefNode(), mRangeUpdater(nullptr)
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{
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}
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DeleteNodeTxn::~DeleteNodeTxn()
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{
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}
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NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTxn, EditTxn,
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mNode,
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mParent,
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mRefNode)
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NS_IMPL_ADDREF_INHERITED(DeleteNodeTxn, EditTxn)
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NS_IMPL_RELEASE_INHERITED(DeleteNodeTxn, EditTxn)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTxn)
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NS_INTERFACE_MAP_END_INHERITING(EditTxn)
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nsresult
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DeleteNodeTxn::Init(nsEditor* aEditor, nsINode* aNode,
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nsRangeUpdater* aRangeUpdater)
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{
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NS_ENSURE_TRUE(aEditor && aNode, NS_ERROR_NULL_POINTER);
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mEditor = aEditor;
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mNode = aNode;
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mParent = aNode->GetParentNode();
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// do nothing if the node has a parent and it's read-only
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NS_ENSURE_TRUE(!mParent || mEditor->IsModifiableNode(mParent),
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NS_ERROR_FAILURE);
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mRangeUpdater = aRangeUpdater;
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return NS_OK;
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}
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NS_IMETHODIMP
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DeleteNodeTxn::DoTransaction()
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{
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NS_ENSURE_TRUE(mNode, NS_ERROR_NOT_INITIALIZED);
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if (!mParent) {
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// this is a no-op, there's no parent to delete mNode from
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return NS_OK;
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}
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// remember which child mNode was (by remembering which child was next);
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// mRefNode can be null
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mRefNode = mNode->GetNextSibling();
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// give range updater a chance. SelAdjDeleteNode() needs to be called
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// *before* we do the action, unlike some of the other nsRangeStore update
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// methods.
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if (mRangeUpdater) {
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mRangeUpdater->SelAdjDeleteNode(mNode->AsDOMNode());
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}
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ErrorResult error;
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mParent->RemoveChild(*mNode, error);
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return error.StealNSResult();
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}
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NS_IMETHODIMP
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DeleteNodeTxn::UndoTransaction()
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{
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if (!mParent) {
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// this is a legal state, the txn is a no-op
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return NS_OK;
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}
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if (!mNode) {
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return NS_ERROR_NULL_POINTER;
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}
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ErrorResult error;
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mParent->InsertBefore(*mNode, mRefNode, error);
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return error.StealNSResult();
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}
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NS_IMETHODIMP
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DeleteNodeTxn::RedoTransaction()
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{
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if (!mParent) {
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// this is a legal state, the txn is a no-op
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return NS_OK;
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}
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if (!mNode) {
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return NS_ERROR_NULL_POINTER;
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}
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if (mRangeUpdater) {
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mRangeUpdater->SelAdjDeleteNode(mNode->AsDOMNode());
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}
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ErrorResult error;
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mParent->RemoveChild(*mNode, error);
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return error.StealNSResult();
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}
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NS_IMETHODIMP
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DeleteNodeTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("DeleteNodeTxn");
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return NS_OK;
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}
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