129 lines
3.9 KiB
C++
129 lines
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SplitNodeTxn.h"
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#include "mozilla/dom/Selection.h"
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#include "nsAString.h"
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#include "nsDebug.h" // for NS_ASSERTION, etc
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#include "nsEditor.h" // for nsEditor
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#include "nsError.h" // for NS_ERROR_NOT_INITIALIZED, etc
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#include "nsIContent.h" // for nsIContent
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using namespace mozilla;
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using namespace mozilla::dom;
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// note that aEditor is not refcounted
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SplitNodeTxn::SplitNodeTxn(nsEditor& aEditor, nsIContent& aNode,
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int32_t aOffset)
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: EditTxn()
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, mEditor(aEditor)
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, mExistingRightNode(&aNode)
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, mOffset(aOffset)
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, mNewLeftNode(nullptr)
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, mParent(nullptr)
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{
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}
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SplitNodeTxn::~SplitNodeTxn()
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{
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}
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NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitNodeTxn, EditTxn,
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mParent,
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mNewLeftNode)
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NS_IMPL_ADDREF_INHERITED(SplitNodeTxn, EditTxn)
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NS_IMPL_RELEASE_INHERITED(SplitNodeTxn, EditTxn)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitNodeTxn)
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NS_INTERFACE_MAP_END_INHERITING(EditTxn)
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NS_IMETHODIMP
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SplitNodeTxn::DoTransaction()
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{
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// Create a new node
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ErrorResult rv;
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// Don't use .downcast directly because AsContent has an assertion we want
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nsCOMPtr<nsINode> clone = mExistingRightNode->CloneNode(false, rv);
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NS_ASSERTION(!rv.Failed() && clone, "Could not create clone");
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NS_ENSURE_TRUE(!rv.Failed() && clone, rv.StealNSResult());
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mNewLeftNode = dont_AddRef(clone.forget().take()->AsContent());
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mEditor.MarkNodeDirty(mExistingRightNode->AsDOMNode());
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// Get the parent node
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mParent = mExistingRightNode->GetParentNode();
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NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
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// Insert the new node
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rv = mEditor.SplitNodeImpl(*mExistingRightNode, mOffset, *mNewLeftNode);
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if (mEditor.GetShouldTxnSetSelection()) {
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RefPtr<Selection> selection = mEditor.GetSelection();
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NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
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rv = selection->Collapse(mNewLeftNode, mOffset);
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}
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return rv.StealNSResult();
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}
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NS_IMETHODIMP
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SplitNodeTxn::UndoTransaction()
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{
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MOZ_ASSERT(mNewLeftNode && mParent);
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// This assumes Do inserted the new node in front of the prior existing node
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return mEditor.JoinNodesImpl(mExistingRightNode, mNewLeftNode, mParent);
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}
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/* Redo cannot simply resplit the right node, because subsequent transactions
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* on the redo stack may depend on the left node existing in its previous
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* state.
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*/
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NS_IMETHODIMP
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SplitNodeTxn::RedoTransaction()
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{
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MOZ_ASSERT(mNewLeftNode && mParent);
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ErrorResult rv;
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// First, massage the existing node so it is in its post-split state
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if (mExistingRightNode->GetAsText()) {
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rv = mExistingRightNode->GetAsText()->DeleteData(0, mOffset);
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NS_ENSURE_TRUE(!rv.Failed(), rv.StealNSResult());
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} else {
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nsCOMPtr<nsIContent> child = mExistingRightNode->GetFirstChild();
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nsCOMPtr<nsIContent> nextSibling;
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for (int32_t i=0; i < mOffset; i++) {
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if (rv.Failed()) {
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return rv.StealNSResult();
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}
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if (!child) {
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return NS_ERROR_NULL_POINTER;
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}
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nextSibling = child->GetNextSibling();
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mExistingRightNode->RemoveChild(*child, rv);
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if (!rv.Failed()) {
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mNewLeftNode->AppendChild(*child, rv);
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}
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child = nextSibling;
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}
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}
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// Second, re-insert the left node into the tree
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nsCOMPtr<nsIContent> refNode = mExistingRightNode;
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mParent->InsertBefore(*mNewLeftNode, refNode, rv);
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return rv.StealNSResult();
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}
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NS_IMETHODIMP
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SplitNodeTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("SplitNodeTxn");
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return NS_OK;
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}
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nsIContent*
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SplitNodeTxn::GetNewNode()
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{
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return mNewLeftNode;
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}
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