michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "DeleteNodeTxn.h"
michael@0: #include "nsDebug.h"
michael@0: #include "nsEditor.h"
michael@0: #include "nsError.h"
michael@0: #include "nsSelectionState.h" // nsRangeUpdater
michael@0: #include "nsAString.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: 
michael@0: DeleteNodeTxn::DeleteNodeTxn()
michael@0:   : EditTxn(), mNode(), mParent(), mRefNode(), mRangeUpdater(nullptr)
michael@0: {
michael@0: }
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_INHERITED(DeleteNodeTxn, EditTxn,
michael@0:                                    mNode,
michael@0:                                    mParent,
michael@0:                                    mRefNode)
michael@0: 
michael@0: NS_IMPL_ADDREF_INHERITED(DeleteNodeTxn, EditTxn)
michael@0: NS_IMPL_RELEASE_INHERITED(DeleteNodeTxn, EditTxn)
michael@0: NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DeleteNodeTxn)
michael@0: NS_INTERFACE_MAP_END_INHERITING(EditTxn)
michael@0: 
michael@0: nsresult
michael@0: DeleteNodeTxn::Init(nsEditor* aEditor, nsINode* aNode,
michael@0:                     nsRangeUpdater* aRangeUpdater)
michael@0: {
michael@0:   NS_ENSURE_TRUE(aEditor && aNode, NS_ERROR_NULL_POINTER);
michael@0:   mEditor = aEditor;
michael@0:   mNode = aNode;
michael@0:   mParent = aNode->GetParentNode();
michael@0: 
michael@0:   // do nothing if the node has a parent and it's read-only
michael@0:   NS_ENSURE_TRUE(!mParent || mEditor->IsModifiableNode(mParent),
michael@0:                  NS_ERROR_FAILURE);
michael@0: 
michael@0:   mRangeUpdater = aRangeUpdater;
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: DeleteNodeTxn::DoTransaction()
michael@0: {
michael@0:   NS_ENSURE_TRUE(mNode, NS_ERROR_NOT_INITIALIZED);
michael@0: 
michael@0:   if (!mParent) {
michael@0:     // this is a no-op, there's no parent to delete mNode from
michael@0:     return NS_OK;
michael@0:   }
michael@0: 
michael@0:   // remember which child mNode was (by remembering which child was next);
michael@0:   // mRefNode can be null
michael@0:   mRefNode = mNode->GetNextSibling();
michael@0: 
michael@0:   // give range updater a chance.  SelAdjDeleteNode() needs to be called
michael@0:   // *before* we do the action, unlike some of the other nsRangeStore update
michael@0:   // methods.
michael@0:   if (mRangeUpdater) {
michael@0:     mRangeUpdater->SelAdjDeleteNode(mNode->AsDOMNode());
michael@0:   }
michael@0: 
michael@0:   ErrorResult error;
michael@0:   mParent->RemoveChild(*mNode, error);
michael@0:   return error.ErrorCode();
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: DeleteNodeTxn::UndoTransaction()
michael@0: {
michael@0:   if (!mParent) {
michael@0:     // this is a legal state, the txn is a no-op
michael@0:     return NS_OK;
michael@0:   }
michael@0:   if (!mNode) {
michael@0:     return NS_ERROR_NULL_POINTER;
michael@0:   }
michael@0: 
michael@0:   ErrorResult error;
michael@0:   mParent->InsertBefore(*mNode, mRefNode, error);
michael@0:   return error.ErrorCode();
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: DeleteNodeTxn::RedoTransaction()
michael@0: {
michael@0:   if (!mParent) {
michael@0:     // this is a legal state, the txn is a no-op
michael@0:     return NS_OK;
michael@0:   }
michael@0:   if (!mNode) {
michael@0:     return NS_ERROR_NULL_POINTER;
michael@0:   }
michael@0: 
michael@0:   if (mRangeUpdater) {
michael@0:     mRangeUpdater->SelAdjDeleteNode(mNode->AsDOMNode());
michael@0:   }
michael@0: 
michael@0:   ErrorResult error;
michael@0:   mParent->RemoveChild(*mNode, error);
michael@0:   return error.ErrorCode();
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP
michael@0: DeleteNodeTxn::GetTxnDescription(nsAString& aString)
michael@0: {
michael@0:   aString.AssignLiteral("DeleteNodeTxn");
michael@0:   return NS_OK;
michael@0: }