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/* -*- 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 "SplitNodeTransaction.h"
#include "mozilla/EditorDOMPoint.h" // for RangeBoundary, EditorRawDOMPoint
#include "mozilla/HTMLEditor.h" // for HTMLEditor
#include "mozilla/dom/Selection.h"
#include "nsAString.h"
#include "nsDebug.h" // for NS_ASSERTION, etc.
#include "nsError.h" // for NS_ERROR_NOT_INITIALIZED, etc.
#include "nsIContent.h" // for nsIContent
namespace mozilla {
using namespace dom;
template already_AddRefed<SplitNodeTransaction> SplitNodeTransaction::Create(
HTMLEditor& aHTMLEditor, const EditorDOMPoint& aStartOfRightContent);
template already_AddRefed<SplitNodeTransaction> SplitNodeTransaction::Create(
HTMLEditor& aHTMLEditor, const EditorRawDOMPoint& aStartOfRightContent);
// static
template <typename PT, typename CT>
already_AddRefed<SplitNodeTransaction> SplitNodeTransaction::Create(
HTMLEditor& aHTMLEditor,
const EditorDOMPointBase<PT, CT>& aStartOfRightContent) {
RefPtr<SplitNodeTransaction> transaction =
new SplitNodeTransaction(aHTMLEditor, aStartOfRightContent);
return transaction.forget();
}
template <typename PT, typename CT>
SplitNodeTransaction::SplitNodeTransaction(
HTMLEditor& aHTMLEditor,
const EditorDOMPointBase<PT, CT>& aStartOfRightContent)
: mHTMLEditor(&aHTMLEditor), mStartOfRightContent(aStartOfRightContent) {
MOZ_DIAGNOSTIC_ASSERT(aStartOfRightContent.IsInContentNode());
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitNodeTransaction, EditTransactionBase,
mHTMLEditor, mStartOfRightContent,
mContainerParentNode, mNewLeftContent)
NS_IMPL_ADDREF_INHERITED(SplitNodeTransaction, EditTransactionBase)
NS_IMPL_RELEASE_INHERITED(SplitNodeTransaction, EditTransactionBase)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitNodeTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
NS_IMETHODIMP SplitNodeTransaction::DoTransaction() {
if (NS_WARN_IF(!mHTMLEditor) ||
NS_WARN_IF(!mStartOfRightContent.IsInContentNode())) {
return NS_ERROR_NOT_AVAILABLE;
}
MOZ_ASSERT(mStartOfRightContent.IsSetAndValid());
// Create a new node
ErrorResult error;
// Don't use .downcast directly because AsContent has an assertion we want
nsCOMPtr<nsINode> cloneOfRightContainer =
mStartOfRightContent.GetContainer()->CloneNode(false, error);
if (error.Failed()) {
NS_WARNING("nsINode::CloneNode() failed");
return error.StealNSResult();
}
if (NS_WARN_IF(!cloneOfRightContainer)) {
return NS_ERROR_UNEXPECTED;
}
mNewLeftContent = cloneOfRightContainer->AsContent();
mContainerParentNode = mStartOfRightContent.GetContainerParent();
if (!mContainerParentNode) {
NS_WARNING("Right container was an orphan node");
return NS_ERROR_NOT_AVAILABLE;
}
OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
OwningNonNull<nsIContent> newLeftContent = *mNewLeftContent;
OwningNonNull<nsINode> containerParentNode = *mContainerParentNode;
EditorDOMPoint startOfRightContent(mStartOfRightContent);
if (RefPtr<Element> startOfRightNode =
startOfRightContent.GetContainerAsElement()) {
nsresult rv = htmlEditor->MarkElementDirty(*startOfRightNode);
if (NS_WARN_IF(rv == NS_ERROR_EDITOR_DESTROYED)) {
return EditorBase::ToGenericNSResult(rv);
}
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
"EditorBase::MarkElementDirty() failed, but ignored");
}
// Insert the new node
htmlEditor->DoSplitNode(startOfRightContent, newLeftContent, error);
if (error.Failed()) {
NS_WARNING("HTMLEditor::DoSplitNode() failed");
return error.StealNSResult();
}
if (!htmlEditor->AllowsTransactionsToChangeSelection()) {
return NS_OK;
}
NS_WARNING_ASSERTION(
!htmlEditor->Destroyed(),
"The editor has gone but SplitNodeTransaction keeps trying to modify "
"Selection");
RefPtr<Selection> selection = htmlEditor->GetSelection();
if (NS_WARN_IF(!selection)) {
return NS_ERROR_FAILURE;
}
EditorRawDOMPoint atEndOfLeftNode(EditorRawDOMPoint::AtEndOf(newLeftContent));
selection->CollapseInLimiter(atEndOfLeftNode, error);
NS_WARNING_ASSERTION(!error.Failed(),
"Selection::CollapseInLimiter() failed");
return error.StealNSResult();
}
NS_IMETHODIMP SplitNodeTransaction::UndoTransaction() {
if (NS_WARN_IF(!mHTMLEditor) || NS_WARN_IF(!mNewLeftContent) ||
NS_WARN_IF(!mContainerParentNode) ||
NS_WARN_IF(!mStartOfRightContent.IsInContentNode())) {
return NS_ERROR_NOT_AVAILABLE;
}
// This assumes Do inserted the new node in front of the prior existing node
// XXX Perhaps, we should reset mStartOfRightNode with current first child
// of the right node.
OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
OwningNonNull<nsIContent> containerContent =
*mStartOfRightContent.ContainerAsContent();
OwningNonNull<nsIContent> newLeftContent = *mNewLeftContent;
nsresult rv = htmlEditor->DoJoinNodes(containerContent, newLeftContent);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "HTMLEditor::DoJoinNodes() failed");
return rv;
}
/* Redo cannot simply resplit the right node, because subsequent transactions
* on the redo stack may depend on the left node existing in its previous
* state.
*/
NS_IMETHODIMP SplitNodeTransaction::RedoTransaction() {
if (NS_WARN_IF(!mNewLeftContent) || NS_WARN_IF(!mContainerParentNode) ||
NS_WARN_IF(!mStartOfRightContent.IsInContentNode()) ||
NS_WARN_IF(!mHTMLEditor)) {
return NS_ERROR_NOT_AVAILABLE;
}
OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
OwningNonNull<nsINode> newLeftContent = *mNewLeftContent;
OwningNonNull<nsINode> containerParentNode = *mContainerParentNode;
EditorDOMPoint startOfRightContent(mStartOfRightContent);
// First, massage the existing node so it is in its post-split state
ErrorResult error;
if (startOfRightContent.IsInTextNode()) {
Text* rightTextNode = startOfRightContent.ContainerAsText();
htmlEditor->DoDeleteText(MOZ_KnownLive(*rightTextNode), 0,
startOfRightContent.Offset(), error);
if (error.Failed()) {
NS_WARNING("EditorBase::DoDeleteText() failed");
return error.StealNSResult();
}
} else {
AutoTArray<OwningNonNull<nsIContent>, 24> movingChildren;
if (nsIContent* child =
startOfRightContent.GetContainer()->GetFirstChild()) {
movingChildren.AppendElement(*child);
for (uint32_t i = 0; i < startOfRightContent.Offset(); i++) {
child = child->GetNextSibling();
if (!child) {
break;
}
movingChildren.AppendElement(*child);
}
}
ErrorResult error;
for (OwningNonNull<nsIContent>& child : movingChildren) {
newLeftContent->AppendChild(child, error);
if (error.Failed()) {
NS_WARNING("nsINode::AppendChild() failed");
return error.StealNSResult();
}
}
}
MOZ_ASSERT(!error.Failed());
// Second, re-insert the left node into the tree
containerParentNode->InsertBefore(newLeftContent,
startOfRightContent.GetContainer(), error);
// InsertBefore() may call MightThrowJSException() even if there is no
// error. We don't need the flag here.
error.WouldReportJSException();
NS_WARNING_ASSERTION(!error.Failed(), "nsINode::InsertBefore() failed");
return error.StealNSResult();
}
} // namespace mozilla
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