mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
111 lines
3.8 KiB
C++
111 lines
3.8 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 <stdio.h> // for printf
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#include "JoinElementTxn.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_NULL_POINTER, etc
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#include "nsIContent.h" // for nsIContent
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#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
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#include "nsIEditor.h" // for nsEditor::IsModifiableNode
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#include "nsISupportsImpl.h" // for EditTxn::QueryInterface, etc
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using namespace mozilla;
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JoinElementTxn::JoinElementTxn()
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: EditTxn()
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{
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}
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NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinElementTxn, EditTxn,
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mLeftNode,
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mRightNode,
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mParent)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinElementTxn)
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NS_INTERFACE_MAP_END_INHERITING(EditTxn)
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NS_IMETHODIMP JoinElementTxn::Init(nsEditor *aEditor,
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nsINode *aLeftNode,
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nsINode *aRightNode)
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{
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NS_PRECONDITION((aEditor && aLeftNode && aRightNode), "null arg");
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if (!aEditor || !aLeftNode || !aRightNode) { return NS_ERROR_NULL_POINTER; }
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mEditor = aEditor;
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mLeftNode = aLeftNode;
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nsCOMPtr<nsINode> leftParent = mLeftNode->GetParentNode();
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if (!mEditor->IsModifiableNode(leftParent)) {
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return NS_ERROR_FAILURE;
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}
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mRightNode = aRightNode;
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mOffset = 0;
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return NS_OK;
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}
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// After DoTransaction() and RedoTransaction(), the left node is removed from the content tree and right node remains.
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NS_IMETHODIMP JoinElementTxn::DoTransaction(void)
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{
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NS_PRECONDITION((mEditor && mLeftNode && mRightNode), "null arg");
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if (!mEditor || !mLeftNode || !mRightNode) { return NS_ERROR_NOT_INITIALIZED; }
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// get the parent node
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nsCOMPtr<nsINode> leftParent = mLeftNode->GetParentNode();
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NS_ENSURE_TRUE(leftParent, NS_ERROR_NULL_POINTER);
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// verify that mLeftNode and mRightNode have the same parent
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nsCOMPtr<nsINode> rightParent = mRightNode->GetParentNode();
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NS_ENSURE_TRUE(rightParent, NS_ERROR_NULL_POINTER);
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if (leftParent != rightParent) {
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NS_ASSERTION(false, "2 nodes do not have same parent");
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return NS_ERROR_INVALID_ARG;
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}
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// set this instance mParent.
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// Other methods will see a non-null mParent and know all is well
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mParent = leftParent;
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mOffset = mLeftNode->Length();
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return mEditor->JoinNodesImpl(mRightNode, mLeftNode, mParent);
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}
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//XXX: what if instead of split, we just deleted the unneeded children of mRight
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// and re-inserted mLeft?
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NS_IMETHODIMP JoinElementTxn::UndoTransaction(void)
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{
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NS_ASSERTION(mRightNode && mLeftNode && mParent, "bad state");
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if (!mRightNode || !mLeftNode || !mParent) { return NS_ERROR_NOT_INITIALIZED; }
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// first, massage the existing node so it is in its post-split state
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nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mRightNode);
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ErrorResult rv;
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if (rightNodeAsText)
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{
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rv = rightNodeAsText->DeleteData(0, mOffset);
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NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
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}
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else
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{
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for (nsCOMPtr<nsINode> child = mRightNode->GetFirstChild();
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child;
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child = child->GetNextSibling())
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{
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mLeftNode->AppendChild(*child, rv);
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NS_ENSURE_SUCCESS(rv.ErrorCode(), rv.ErrorCode());
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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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mParent->InsertBefore(*mLeftNode, mRightNode, rv);
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return rv.ErrorCode();
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}
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NS_IMETHODIMP JoinElementTxn::GetTxnDescription(nsAString& aString)
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{
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aString.AssignLiteral("JoinElementTxn");
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return NS_OK;
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}
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