1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/editor/libeditor/base/SplitElementTxn.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,157 @@
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 "SplitElementTxn.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_NOT_INITIALIZED, etc
1.16 +#include "nsIDOMCharacterData.h" // for nsIDOMCharacterData
1.17 +#include "nsIDOMNode.h" // for nsIDOMNode
1.18 +#include "nsIEditor.h" // for nsEditor::DebugDumpContent, etc
1.19 +#include "nsISelection.h" // for nsISelection
1.20 +#include "nsISupportsUtils.h" // for NS_ADDREF
1.21 +
1.22 +// note that aEditor is not refcounted
1.23 +SplitElementTxn::SplitElementTxn()
1.24 + : EditTxn()
1.25 +{
1.26 +}
1.27 +
1.28 +NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitElementTxn, EditTxn,
1.29 + mParent,
1.30 + mNewLeftNode)
1.31 +
1.32 +NS_IMPL_ADDREF_INHERITED(SplitElementTxn, EditTxn)
1.33 +NS_IMPL_RELEASE_INHERITED(SplitElementTxn, EditTxn)
1.34 +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitElementTxn)
1.35 +NS_INTERFACE_MAP_END_INHERITING(EditTxn)
1.36 +
1.37 +NS_IMETHODIMP SplitElementTxn::Init(nsEditor *aEditor,
1.38 + nsIDOMNode *aNode,
1.39 + int32_t aOffset)
1.40 +{
1.41 + NS_ASSERTION(aEditor && aNode, "bad args");
1.42 + if (!aEditor || !aNode) { return NS_ERROR_NOT_INITIALIZED; }
1.43 +
1.44 + mEditor = aEditor;
1.45 + mExistingRightNode = do_QueryInterface(aNode);
1.46 + mOffset = aOffset;
1.47 + return NS_OK;
1.48 +}
1.49 +
1.50 +NS_IMETHODIMP SplitElementTxn::DoTransaction(void)
1.51 +{
1.52 + NS_ASSERTION(mExistingRightNode && mEditor, "bad state");
1.53 + if (!mExistingRightNode || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
1.54 +
1.55 + // create a new node
1.56 + nsresult result = mExistingRightNode->CloneNode(false, 1, getter_AddRefs(mNewLeftNode));
1.57 + NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
1.58 + NS_ENSURE_SUCCESS(result, result);
1.59 + NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NULL_POINTER);
1.60 + mEditor->MarkNodeDirty(mExistingRightNode);
1.61 +
1.62 + // get the parent node
1.63 + result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
1.64 + NS_ENSURE_SUCCESS(result, result);
1.65 + NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
1.66 +
1.67 + // insert the new node
1.68 + result = mEditor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
1.69 + if (mNewLeftNode) {
1.70 + bool bAdjustSelection;
1.71 + mEditor->ShouldTxnSetSelection(&bAdjustSelection);
1.72 + if (bAdjustSelection)
1.73 + {
1.74 + nsCOMPtr<nsISelection> selection;
1.75 + result = mEditor->GetSelection(getter_AddRefs(selection));
1.76 + NS_ENSURE_SUCCESS(result, result);
1.77 + NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
1.78 + result = selection->Collapse(mNewLeftNode, mOffset);
1.79 + }
1.80 + else
1.81 + {
1.82 + // do nothing - dom range gravity will adjust selection
1.83 + }
1.84 + }
1.85 + return result;
1.86 +}
1.87 +
1.88 +NS_IMETHODIMP SplitElementTxn::UndoTransaction(void)
1.89 +{
1.90 + NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
1.91 + if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
1.92 + return NS_ERROR_NOT_INITIALIZED;
1.93 + }
1.94 +
1.95 + // this assumes Do inserted the new node in front of the prior existing node
1.96 + nsCOMPtr<nsINode> rightNode = do_QueryInterface(mExistingRightNode);
1.97 + nsCOMPtr<nsINode> leftNode = do_QueryInterface(mNewLeftNode);
1.98 + nsCOMPtr<nsINode> parent = do_QueryInterface(mParent);
1.99 + NS_ENSURE_TRUE(rightNode && leftNode && parent, NS_ERROR_FAILURE);
1.100 + return mEditor->JoinNodesImpl(rightNode, leftNode, parent);
1.101 +}
1.102 +
1.103 +/* redo cannot simply resplit the right node, because subsequent transactions
1.104 + * on the redo stack may depend on the left node existing in its previous state.
1.105 + */
1.106 +NS_IMETHODIMP SplitElementTxn::RedoTransaction(void)
1.107 +{
1.108 + NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
1.109 + if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
1.110 + return NS_ERROR_NOT_INITIALIZED;
1.111 + }
1.112 +
1.113 + nsresult result;
1.114 + nsCOMPtr<nsIDOMNode>resultNode;
1.115 + // first, massage the existing node so it is in its post-split state
1.116 + nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mExistingRightNode);
1.117 + if (rightNodeAsText)
1.118 + {
1.119 + nsresult result = rightNodeAsText->DeleteData(0, mOffset);
1.120 + NS_ENSURE_SUCCESS(result, result);
1.121 + }
1.122 + else
1.123 + {
1.124 + nsCOMPtr<nsIDOMNode>child;
1.125 + nsCOMPtr<nsIDOMNode>nextSibling;
1.126 + result = mExistingRightNode->GetFirstChild(getter_AddRefs(child));
1.127 + int32_t i;
1.128 + for (i=0; i<mOffset; i++)
1.129 + {
1.130 + if (NS_FAILED(result)) {return result;}
1.131 + if (!child) {return NS_ERROR_NULL_POINTER;}
1.132 + child->GetNextSibling(getter_AddRefs(nextSibling));
1.133 + result = mExistingRightNode->RemoveChild(child, getter_AddRefs(resultNode));
1.134 + if (NS_SUCCEEDED(result))
1.135 + {
1.136 + result = mNewLeftNode->AppendChild(child, getter_AddRefs(resultNode));
1.137 + }
1.138 + child = do_QueryInterface(nextSibling);
1.139 + }
1.140 + }
1.141 + // second, re-insert the left node into the tree
1.142 + result = mParent->InsertBefore(mNewLeftNode, mExistingRightNode, getter_AddRefs(resultNode));
1.143 + return result;
1.144 +}
1.145 +
1.146 +
1.147 +NS_IMETHODIMP SplitElementTxn::GetTxnDescription(nsAString& aString)
1.148 +{
1.149 + aString.AssignLiteral("SplitElementTxn");
1.150 + return NS_OK;
1.151 +}
1.152 +
1.153 +NS_IMETHODIMP SplitElementTxn::GetNewNode(nsIDOMNode **aNewNode)
1.154 +{
1.155 + NS_ENSURE_TRUE(aNewNode, NS_ERROR_NULL_POINTER);
1.156 + NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NOT_INITIALIZED);
1.157 + *aNewNode = mNewLeftNode;
1.158 + NS_ADDREF(*aNewNode);
1.159 + return NS_OK;
1.160 +}
