gecko-dev/editor/libeditor/JoinNodeTxn.cpp
Boris Zbarsky 1540774b0c Bug 1157898 part 1. Make code of the form "return rv.ErrorCode();" where rv is an ErrorResult use StealNSResult instead. r=peterv
This patch was generated with the following command:

  find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 's/return ([a-zA-Z0-9]+)\.ErrorCode\(\);/return \1.StealNSResult();/'
2015-04-27 09:18:51 -04:00

106 lines
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 "JoinNodeTxn.h"
#include "nsAString.h"
#include "nsDebug.h" // for NS_ASSERTION, etc
#include "nsEditor.h" // for nsEditor
#include "nsError.h" // for NS_ERROR_NULL_POINTER, etc
#include "nsIContent.h" // for nsIContent
#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
#include "nsIEditor.h" // for nsEditor::IsModifiableNode
#include "nsISupportsImpl.h" // for EditTxn::QueryInterface, etc
using namespace mozilla;
using namespace mozilla::dom;
JoinNodeTxn::JoinNodeTxn(nsEditor& aEditor, nsINode& aLeftNode,
nsINode& aRightNode)
: EditTxn()
, mEditor(aEditor)
, mLeftNode(&aLeftNode)
, mRightNode(&aRightNode)
, mOffset(0)
, mParent(nullptr)
{
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinNodeTxn, EditTxn,
mLeftNode,
mRightNode,
mParent)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinNodeTxn)
NS_INTERFACE_MAP_END_INHERITING(EditTxn)
nsresult
JoinNodeTxn::CheckValidity()
{
if (!mEditor.IsModifiableNode(mLeftNode->GetParentNode())) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
// After DoTransaction() and RedoTransaction(), the left node is removed from
// the content tree and right node remains.
NS_IMETHODIMP
JoinNodeTxn::DoTransaction()
{
// Get the parent node
nsCOMPtr<nsINode> leftParent = mLeftNode->GetParentNode();
NS_ENSURE_TRUE(leftParent, NS_ERROR_NULL_POINTER);
// Verify that mLeftNode and mRightNode have the same parent
if (leftParent != mRightNode->GetParentNode()) {
NS_ASSERTION(false, "Nodes do not have same parent");
return NS_ERROR_INVALID_ARG;
}
// Set this instance's mParent. Other methods will see a non-null mParent
// and know all is well
mParent = leftParent;
mOffset = mLeftNode->Length();
return mEditor.JoinNodesImpl(mRightNode, mLeftNode, mParent);
}
//XXX: What if instead of split, we just deleted the unneeded children of
// mRight and re-inserted mLeft?
NS_IMETHODIMP
JoinNodeTxn::UndoTransaction()
{
MOZ_ASSERT(mParent);
// First, massage the existing node so it is in its post-split state
ErrorResult rv;
if (mRightNode->GetAsText()) {
rv = mRightNode->GetAsText()->DeleteData(0, mOffset);
} else {
nsCOMPtr<nsIContent> child = mRightNode->GetFirstChild();
for (uint32_t i = 0; i < mOffset; i++) {
if (rv.Failed()) {
return rv.StealNSResult();
}
if (!child) {
return NS_ERROR_NULL_POINTER;
}
nsCOMPtr<nsIContent> nextSibling = child->GetNextSibling();
mLeftNode->AppendChild(*child, rv);
child = nextSibling;
}
}
// Second, re-insert the left node into the tree
mParent->InsertBefore(*mLeftNode, mRightNode, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
JoinNodeTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("JoinNodeTxn");
return NS_OK;
}