gecko-dev/editor/libeditor/CreateElementTransaction.cpp

180 строки
5.8 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 "CreateElementTransaction.h"
#include <algorithm>
#include <stdio.h>
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/Casting.h"
#include "mozilla/EditorBase.h"
#include "mozilla/EditorDOMPoint.h"
#include "nsAlgorithm.h"
#include "nsAString.h"
#include "nsDebug.h"
#include "nsError.h"
#include "nsIContent.h"
#include "nsIEditor.h"
#include "nsINode.h"
#include "nsISupportsUtils.h"
#include "nsMemory.h"
#include "nsReadableUtils.h"
#include "nsStringFwd.h"
#include "nsString.h"
namespace mozilla {
using namespace dom;
template already_AddRefed<CreateElementTransaction>
CreateElementTransaction::Create(EditorBase& aEditorBase, nsAtom& aTag,
const EditorDOMPoint& aPointToInsert);
template already_AddRefed<CreateElementTransaction>
CreateElementTransaction::Create(EditorBase& aEditorBase, nsAtom& aTag,
const EditorRawDOMPoint& aPointToInsert);
template <typename PT, typename CT>
already_AddRefed<CreateElementTransaction> CreateElementTransaction::Create(
EditorBase& aEditorBase, nsAtom& aTag,
const EditorDOMPointBase<PT, CT>& aPointToInsert) {
RefPtr<CreateElementTransaction> transaction =
new CreateElementTransaction(aEditorBase, aTag, aPointToInsert);
return transaction.forget();
}
template <typename PT, typename CT>
CreateElementTransaction::CreateElementTransaction(
EditorBase& aEditorBase, nsAtom& aTag,
const EditorDOMPointBase<PT, CT>& aPointToInsert)
: EditTransactionBase(),
mEditorBase(&aEditorBase),
mTag(&aTag),
mPointToInsert(aPointToInsert) {}
CreateElementTransaction::~CreateElementTransaction() {}
NS_IMPL_CYCLE_COLLECTION_INHERITED(CreateElementTransaction,
EditTransactionBase, mEditorBase,
mPointToInsert, mNewNode)
NS_IMPL_ADDREF_INHERITED(CreateElementTransaction, EditTransactionBase)
NS_IMPL_RELEASE_INHERITED(CreateElementTransaction, EditTransactionBase)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CreateElementTransaction)
NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
NS_IMETHODIMP
CreateElementTransaction::DoTransaction() {
if (NS_WARN_IF(!mEditorBase) || NS_WARN_IF(!mTag) ||
NS_WARN_IF(!mPointToInsert.IsSet())) {
return NS_ERROR_NOT_INITIALIZED;
}
mNewNode = mEditorBase->CreateHTMLContent(mTag);
NS_ENSURE_STATE(mNewNode);
// Try to insert formatting whitespace for the new node:
mEditorBase->MarkNodeDirty(mNewNode);
// Insert the new node
ErrorResult error;
InsertNewNode(error);
if (NS_WARN_IF(error.Failed())) {
return error.StealNSResult();
}
// Only set selection to insertion point if editor gives permission
if (!mEditorBase->AllowsTransactionsToChangeSelection()) {
// Do nothing - DOM range gravity will adjust selection
return NS_OK;
}
RefPtr<Selection> selection = mEditorBase->GetSelection();
NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
EditorRawDOMPoint afterNewNode(mNewNode);
if (NS_WARN_IF(!afterNewNode.AdvanceOffset())) {
// If mutation observer or mutation event listener moved or removed the
// new node, we hit this case. Should we use script blocker while we're
// in this method?
return NS_ERROR_FAILURE;
}
selection->Collapse(afterNewNode, error);
if (error.Failed()) {
NS_WARNING("selection could not be collapsed after insert");
error.SuppressException();
}
return NS_OK;
}
void CreateElementTransaction::InsertNewNode(ErrorResult& aError) {
if (mPointToInsert.IsSetAndValid()) {
if (mPointToInsert.IsEndOfContainer()) {
mPointToInsert.GetContainer()->AppendChild(*mNewNode, aError);
NS_WARNING_ASSERTION(!aError.Failed(), "Failed to append the new node");
return;
}
mPointToInsert.GetContainer()->InsertBefore(
*mNewNode, mPointToInsert.GetChild(), aError);
NS_WARNING_ASSERTION(!aError.Failed(), "Failed to insert the new node");
return;
}
if (NS_WARN_IF(mPointToInsert.GetChild() &&
mPointToInsert.GetContainer() !=
mPointToInsert.GetChild()->GetParentNode())) {
aError.Throw(NS_ERROR_FAILURE);
return;
}
// If mPointToInsert has only offset and it's not valid, we need to treat
// it as pointing end of the container.
mPointToInsert.GetContainer()->AppendChild(*mNewNode, aError);
NS_WARNING_ASSERTION(!aError.Failed(), "Failed to append the new node");
}
NS_IMETHODIMP
CreateElementTransaction::UndoTransaction() {
if (NS_WARN_IF(!mEditorBase) || NS_WARN_IF(!mPointToInsert.IsSet())) {
return NS_ERROR_NOT_INITIALIZED;
}
ErrorResult error;
mPointToInsert.GetContainer()->RemoveChild(*mNewNode, error);
if (NS_WARN_IF(error.Failed())) {
return error.StealNSResult();
}
return NS_OK;
}
NS_IMETHODIMP
CreateElementTransaction::RedoTransaction() {
if (NS_WARN_IF(!mEditorBase) || NS_WARN_IF(!mPointToInsert.IsSet())) {
return NS_ERROR_NOT_INITIALIZED;
}
// First, reset mNewNode so it has no attributes or content
// XXX We never actually did this, we only cleared mNewNode's contents if it
// was a CharacterData node (which it's not, it's an Element)
// XXX Don't we need to set selection like DoTransaction()?
// Now, reinsert mNewNode
ErrorResult error;
InsertNewNode(error);
if (NS_WARN_IF(error.Failed())) {
return error.StealNSResult();
}
return NS_OK;
}
already_AddRefed<Element> CreateElementTransaction::GetNewNode() {
return nsCOMPtr<Element>(mNewNode).forget();
}
} // namespace mozilla