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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 "JoinNodesTransaction.h"
#include "EditorDOMPoint.h" // for EditorDOMPoint, etc.
#include "HTMLEditor.h" // for HTMLEditor
#include "HTMLEditUtils.h"
#include "mozilla/Logging.h"
#include "mozilla/ToString.h"
#include "mozilla/dom/Text.h"
#include "nsAString.h"
#include "nsDebug.h" // for NS_ASSERTION, etc.
#include "nsError.h" // for NS_ERROR_NULL_POINTER, etc.
#include "nsIContent.h" // for nsIContent
#include "nsISupportsImpl.h" // for QueryInterface, etc.
namespace mozilla {
using namespace dom;
// static
already_AddRefed<JoinNodesTransaction> JoinNodesTransaction::MaybeCreate(
HTMLEditor& aHTMLEditor, nsIContent& aLeftContent,
nsIContent& aRightContent) {
RefPtr<JoinNodesTransaction> transaction =
new JoinNodesTransaction(aHTMLEditor, aLeftContent, aRightContent);
if (NS_WARN_IF(!transaction->CanDoIt())) {
return nullptr;
}
return transaction.forget();
}
JoinNodesTransaction::JoinNodesTransaction(HTMLEditor& aHTMLEditor,
nsIContent& aLeftContent,
nsIContent& aRightContent)
: mHTMLEditor(&aHTMLEditor),
mRemovedContent(&aLeftContent),
mKeepingContent(&aRightContent) {
// printf("JoinNodesTransaction size: %zu\n", sizeof(JoinNodesTransaction));
static_assert(sizeof(JoinNodesTransaction) <= 64,
"Transaction classes may be created a lot and may be alive "
"long so that keep the foot print smaller as far as possible");
}
std::ostream& operator<<(std::ostream& aStream,
const JoinNodesTransaction& aTransaction) {
aStream << "{ mParentNode=" << aTransaction.mParentNode.get();
if (aTransaction.mParentNode) {
aStream << " (" << *aTransaction.mParentNode << ")";
}
aStream << ", mRemovedContent=" << aTransaction.mRemovedContent.get();
if (aTransaction.mRemovedContent) {
aStream << " (" << *aTransaction.mRemovedContent << ")";
}
aStream << ", mKeepingContent=" << aTransaction.mKeepingContent.get();
if (aTransaction.mKeepingContent) {
aStream << " (" << *aTransaction.mKeepingContent << ")";
}
aStream << ", mJoinedOffset=" << aTransaction.mJoinedOffset
<< ", mHTMLEditor=" << aTransaction.mHTMLEditor.get() << " }";
return aStream;
}
NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinNodesTransaction, EditTransactionBase,
mHTMLEditor, mParentNode, mRemovedContent,
mKeepingContent)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinNodesTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
bool JoinNodesTransaction::CanDoIt() const {
if (NS_WARN_IF(!mKeepingContent) || NS_WARN_IF(!mRemovedContent) ||
NS_WARN_IF(!mHTMLEditor) ||
NS_WARN_IF(mRemovedContent->IsBeingRemoved()) ||
!mKeepingContent->IsInComposedDoc()) {
return false;
}
return HTMLEditUtils::IsRemovableFromParentNode(*mRemovedContent);
}
// After DoTransaction() and RedoTransaction(), the left node is removed from
// the content tree and right node remains.
NS_IMETHODIMP JoinNodesTransaction::DoTransaction() {
MOZ_LOG(GetLogModule(), LogLevel::Info,
("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
ToString(*this).c_str()));
return DoTransactionInternal(RedoingTransaction::No);
}
nsresult JoinNodesTransaction::DoTransactionInternal(
RedoingTransaction aRedoingTransaction) {
if (MOZ_UNLIKELY(NS_WARN_IF(!mHTMLEditor) || NS_WARN_IF(!mKeepingContent) ||
NS_WARN_IF(!mRemovedContent) ||
NS_WARN_IF(mRemovedContent->IsBeingRemoved()))) {
return NS_ERROR_NOT_AVAILABLE;
}
nsINode* removingContentParentNode = mRemovedContent->GetParentNode();
if (MOZ_UNLIKELY(NS_WARN_IF(!removingContentParentNode))) {
return NS_ERROR_NOT_AVAILABLE;
}
// Verify that the joining content nodes have the same parent
if (MOZ_UNLIKELY(removingContentParentNode !=
mKeepingContent->GetParentNode())) {
NS_ASSERTION(false, "Nodes do not have same parent");
return NS_ERROR_NOT_AVAILABLE;
}
// Set this instance's mParentNode. Other methods will see a non-null
// mParentNode and know all is well
mParentNode = removingContentParentNode;
// For now, setting mJoinedOffset to removed content length so that
// CreateJoinedPoint returns a point in mKeepingContent whose offset is
// the result if all content in mRemovedContent are moved to start of
// mKeepingContent. The offset will be adjusted below.
mJoinedOffset = mRemovedContent->Length();
const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
const OwningNonNull<nsIContent> removingContent = *mRemovedContent;
const OwningNonNull<nsIContent> keepingContent = *mKeepingContent;
nsresult rv;
// Let's try to get actual joined point with the tacker.
EditorDOMPoint joinNodesPoint(mKeepingContent, 0u);
{
AutoTrackDOMPoint trackJoinNodePoint(htmlEditor->RangeUpdaterRef(),
&joinNodesPoint);
rv = htmlEditor->DoJoinNodes(keepingContent, removingContent);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "HTMLEditor::DoJoinNodes() failed");
}
// Adjust join node offset to the actual offset where the original first
// content of the right node is.
mJoinedOffset = joinNodesPoint.Offset();
if (aRedoingTransaction == RedoingTransaction::No) {
htmlEditor->DidJoinNodesTransaction(*this, rv);
}
return rv;
}
// XXX: What if instead of split, we just deleted the unneeded children of
// mRight and re-inserted mLeft?
NS_IMETHODIMP JoinNodesTransaction::UndoTransaction() {
MOZ_LOG(GetLogModule(), LogLevel::Info,
("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
ToString(*this).c_str()));
if (NS_WARN_IF(!mParentNode) || NS_WARN_IF(!mKeepingContent) ||
NS_WARN_IF(!mRemovedContent) || NS_WARN_IF(!mHTMLEditor)) {
return NS_ERROR_NOT_AVAILABLE;
}
const OwningNonNull<HTMLEditor> htmlEditor = *mHTMLEditor;
const OwningNonNull<nsIContent> removedContent = *mRemovedContent;
const SplitNodeResult splitNodeResult = htmlEditor->DoSplitNode(
EditorDOMPoint(mKeepingContent,
std::min(mJoinedOffset, mKeepingContent->Length())),
removedContent);
NS_WARNING_ASSERTION(splitNodeResult.isOk(),
"HTMLEditor::DoSplitNode() failed");
// When adding caret suggestion to SplitNodeResult, here didn't change
// selection so that just ignore it.
splitNodeResult.IgnoreCaretPointSuggestion();
return splitNodeResult.unwrapErr();
}
NS_IMETHODIMP JoinNodesTransaction::RedoTransaction() {
MOZ_LOG(GetLogModule(), LogLevel::Info,
("%p JoinNodesTransaction::%s this=%s", this, __FUNCTION__,
ToString(*this).c_str()));
return DoTransactionInternal(RedoingTransaction::Yes);
}
} // namespace mozilla