1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/editor/libeditor/base/JoinElementTxn.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,122 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include <stdio.h> // for printf
1.10 +
1.11 +#include "JoinElementTxn.h"
1.12 +#include "nsAString.h"
1.13 +#include "nsDebug.h" // for NS_ASSERTION, etc
1.14 +#include "nsEditor.h" // for nsEditor
1.15 +#include "nsError.h" // for NS_ERROR_NULL_POINTER, etc
1.16 +#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
1.17 +#include "nsIEditor.h" // for nsEditor::IsModifiableNode
1.18 +#include "nsINode.h" // for nsINode
1.19 +#include "nsISupportsImpl.h" // for EditTxn::QueryInterface, etc
1.20 +
1.21 +JoinElementTxn::JoinElementTxn()
1.22 + : EditTxn()
1.23 +{
1.24 +}
1.25 +
1.26 +NS_IMPL_CYCLE_COLLECTION_INHERITED(JoinElementTxn, EditTxn,
1.27 + mLeftNode,
1.28 + mRightNode,
1.29 + mParent)
1.30 +
1.31 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JoinElementTxn)
1.32 +NS_INTERFACE_MAP_END_INHERITING(EditTxn)
1.33 +
1.34 +NS_IMETHODIMP JoinElementTxn::Init(nsEditor *aEditor,
1.35 + nsIDOMNode *aLeftNode,
1.36 + nsIDOMNode *aRightNode)
1.37 +{
1.38 + NS_PRECONDITION((aEditor && aLeftNode && aRightNode), "null arg");
1.39 + if (!aEditor || !aLeftNode || !aRightNode) { return NS_ERROR_NULL_POINTER; }
1.40 + mEditor = aEditor;
1.41 + mLeftNode = do_QueryInterface(aLeftNode);
1.42 + nsCOMPtr<nsIDOMNode>leftParent;
1.43 + nsresult result = mLeftNode->GetParentNode(getter_AddRefs(leftParent));
1.44 + NS_ENSURE_SUCCESS(result, result);
1.45 + if (!mEditor->IsModifiableNode(leftParent)) {
1.46 + return NS_ERROR_FAILURE;
1.47 + }
1.48 + mRightNode = do_QueryInterface(aRightNode);
1.49 + mOffset = 0;
1.50 + return NS_OK;
1.51 +}
1.52 +
1.53 +// After DoTransaction() and RedoTransaction(), the left node is removed from the content tree and right node remains.
1.54 +NS_IMETHODIMP JoinElementTxn::DoTransaction(void)
1.55 +{
1.56 + NS_PRECONDITION((mEditor && mLeftNode && mRightNode), "null arg");
1.57 + if (!mEditor || !mLeftNode || !mRightNode) { return NS_ERROR_NOT_INITIALIZED; }
1.58 +
1.59 + // get the parent node
1.60 + nsCOMPtr<nsIDOMNode> leftParent;
1.61 + mLeftNode->GetParentNode(getter_AddRefs(leftParent));
1.62 + NS_ENSURE_TRUE(leftParent, NS_ERROR_NULL_POINTER);
1.63 +
1.64 + // verify that mLeftNode and mRightNode have the same parent
1.65 + nsCOMPtr<nsIDOMNode> rightParent;
1.66 + mRightNode->GetParentNode(getter_AddRefs(rightParent));
1.67 + NS_ENSURE_TRUE(rightParent, NS_ERROR_NULL_POINTER);
1.68 +
1.69 + if (leftParent != rightParent) {
1.70 + NS_ASSERTION(false, "2 nodes do not have same parent");
1.71 + return NS_ERROR_INVALID_ARG;
1.72 + }
1.73 +
1.74 + // set this instance mParent.
1.75 + // Other methods will see a non-null mParent and know all is well
1.76 + mParent = leftParent;
1.77 + nsCOMPtr<nsINode> leftNode = do_QueryInterface(mLeftNode);
1.78 + nsCOMPtr<nsINode> rightNode = do_QueryInterface(mRightNode);
1.79 + nsCOMPtr<nsINode> parent = do_QueryInterface(mParent);
1.80 + NS_ENSURE_TRUE(leftNode && rightNode && parent, NS_ERROR_FAILURE);
1.81 + mOffset = leftNode->Length();
1.82 +
1.83 + return mEditor->JoinNodesImpl(rightNode, leftNode, parent);
1.84 +}
1.85 +
1.86 +//XXX: what if instead of split, we just deleted the unneeded children of mRight
1.87 +// and re-inserted mLeft?
1.88 +NS_IMETHODIMP JoinElementTxn::UndoTransaction(void)
1.89 +{
1.90 + NS_ASSERTION(mRightNode && mLeftNode && mParent, "bad state");
1.91 + if (!mRightNode || !mLeftNode || !mParent) { return NS_ERROR_NOT_INITIALIZED; }
1.92 + nsresult result;
1.93 + nsCOMPtr<nsIDOMNode>resultNode;
1.94 + // first, massage the existing node so it is in its post-split state
1.95 + nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mRightNode);
1.96 + if (rightNodeAsText)
1.97 + {
1.98 + result = rightNodeAsText->DeleteData(0, mOffset);
1.99 + }
1.100 + else
1.101 + {
1.102 + nsCOMPtr<nsIDOMNode>child;
1.103 + result = mRightNode->GetFirstChild(getter_AddRefs(child));
1.104 + nsCOMPtr<nsIDOMNode>nextSibling;
1.105 + uint32_t i;
1.106 + for (i=0; i<mOffset; i++)
1.107 + {
1.108 + if (NS_FAILED(result)) {return result;}
1.109 + if (!child) {return NS_ERROR_NULL_POINTER;}
1.110 + child->GetNextSibling(getter_AddRefs(nextSibling));
1.111 + result = mLeftNode->AppendChild(child, getter_AddRefs(resultNode));
1.112 + child = do_QueryInterface(nextSibling);
1.113 + }
1.114 + }
1.115 + // second, re-insert the left node into the tree
1.116 + result = mParent->InsertBefore(mLeftNode, mRightNode, getter_AddRefs(resultNode));
1.117 + return result;
1.118 +
1.119 +}
1.120 +
1.121 +NS_IMETHODIMP JoinElementTxn::GetTxnDescription(nsAString& aString)
1.122 +{
1.123 + aString.AssignLiteral("JoinElementTxn");
1.124 + return NS_OK;
1.125 +}
