michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include <stdio.h>                      // for printf
michael@0: 
michael@0: #include "SplitElementTxn.h"
michael@0: #include "nsAString.h"
michael@0: #include "nsDebug.h"                    // for NS_ASSERTION, etc
michael@0: #include "nsEditor.h"                   // for nsEditor
michael@0: #include "nsError.h"                    // for NS_ERROR_NOT_INITIALIZED, etc
michael@0: #include "nsIDOMCharacterData.h"        // for nsIDOMCharacterData
michael@0: #include "nsIDOMNode.h"                 // for nsIDOMNode
michael@0: #include "nsIEditor.h"                  // for nsEditor::DebugDumpContent, etc
michael@0: #include "nsISelection.h"               // for nsISelection
michael@0: #include "nsISupportsUtils.h"           // for NS_ADDREF
michael@0: 
michael@0: // note that aEditor is not refcounted
michael@0: SplitElementTxn::SplitElementTxn()
michael@0:   : EditTxn()
michael@0: {
michael@0: }
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_INHERITED(SplitElementTxn, EditTxn,
michael@0:                                    mParent,
michael@0:                                    mNewLeftNode)
michael@0: 
michael@0: NS_IMPL_ADDREF_INHERITED(SplitElementTxn, EditTxn)
michael@0: NS_IMPL_RELEASE_INHERITED(SplitElementTxn, EditTxn)
michael@0: NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SplitElementTxn)
michael@0: NS_INTERFACE_MAP_END_INHERITING(EditTxn)
michael@0: 
michael@0: NS_IMETHODIMP SplitElementTxn::Init(nsEditor   *aEditor,
michael@0:                                     nsIDOMNode *aNode,
michael@0:                                     int32_t     aOffset)
michael@0: {
michael@0:   NS_ASSERTION(aEditor && aNode, "bad args");
michael@0:   if (!aEditor || !aNode) { return NS_ERROR_NOT_INITIALIZED; }
michael@0: 
michael@0:   mEditor = aEditor;
michael@0:   mExistingRightNode = do_QueryInterface(aNode);
michael@0:   mOffset = aOffset;
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP SplitElementTxn::DoTransaction(void)
michael@0: {
michael@0:   NS_ASSERTION(mExistingRightNode && mEditor, "bad state");
michael@0:   if (!mExistingRightNode || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
michael@0: 
michael@0:   // create a new node
michael@0:   nsresult result = mExistingRightNode->CloneNode(false, 1, getter_AddRefs(mNewLeftNode));
michael@0:   NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
michael@0:   NS_ENSURE_SUCCESS(result, result);
michael@0:   NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NULL_POINTER);
michael@0:   mEditor->MarkNodeDirty(mExistingRightNode);
michael@0: 
michael@0:   // get the parent node
michael@0:   result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
michael@0:   NS_ENSURE_SUCCESS(result, result);
michael@0:   NS_ENSURE_TRUE(mParent, NS_ERROR_NULL_POINTER);
michael@0: 
michael@0:   // insert the new node
michael@0:   result = mEditor->SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
michael@0:   if (mNewLeftNode) {
michael@0:     bool bAdjustSelection;
michael@0:     mEditor->ShouldTxnSetSelection(&bAdjustSelection);
michael@0:     if (bAdjustSelection)
michael@0:     {
michael@0:       nsCOMPtr<nsISelection> selection;
michael@0:       result = mEditor->GetSelection(getter_AddRefs(selection));
michael@0:       NS_ENSURE_SUCCESS(result, result);
michael@0:       NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);
michael@0:       result = selection->Collapse(mNewLeftNode, mOffset);
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:       // do nothing - dom range gravity will adjust selection
michael@0:     }
michael@0:   }
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP SplitElementTxn::UndoTransaction(void)
michael@0: {
michael@0:   NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
michael@0:   if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
michael@0:     return NS_ERROR_NOT_INITIALIZED;
michael@0:   }
michael@0: 
michael@0:   // this assumes Do inserted the new node in front of the prior existing node
michael@0:   nsCOMPtr<nsINode> rightNode = do_QueryInterface(mExistingRightNode);
michael@0:   nsCOMPtr<nsINode> leftNode = do_QueryInterface(mNewLeftNode);
michael@0:   nsCOMPtr<nsINode> parent = do_QueryInterface(mParent);
michael@0:   NS_ENSURE_TRUE(rightNode && leftNode && parent, NS_ERROR_FAILURE);
michael@0:   return mEditor->JoinNodesImpl(rightNode, leftNode, parent);
michael@0: }
michael@0: 
michael@0: /* redo cannot simply resplit the right node, because subsequent transactions
michael@0:  * on the redo stack may depend on the left node existing in its previous state.
michael@0:  */
michael@0: NS_IMETHODIMP SplitElementTxn::RedoTransaction(void)
michael@0: {
michael@0:   NS_ASSERTION(mEditor && mExistingRightNode && mNewLeftNode && mParent, "bad state");
michael@0:   if (!mEditor || !mExistingRightNode || !mNewLeftNode || !mParent) {
michael@0:     return NS_ERROR_NOT_INITIALIZED;
michael@0:   }
michael@0: 
michael@0:   nsresult result;
michael@0:   nsCOMPtr<nsIDOMNode>resultNode;
michael@0:   // first, massage the existing node so it is in its post-split state
michael@0:   nsCOMPtr<nsIDOMCharacterData>rightNodeAsText = do_QueryInterface(mExistingRightNode);
michael@0:   if (rightNodeAsText)
michael@0:   {
michael@0:     nsresult result = rightNodeAsText->DeleteData(0, mOffset);
michael@0:     NS_ENSURE_SUCCESS(result, result);
michael@0:   }
michael@0:   else
michael@0:   {
michael@0:     nsCOMPtr<nsIDOMNode>child;
michael@0:     nsCOMPtr<nsIDOMNode>nextSibling;
michael@0:     result = mExistingRightNode->GetFirstChild(getter_AddRefs(child));
michael@0:     int32_t i;
michael@0:     for (i=0; i<mOffset; i++)
michael@0:     {
michael@0:       if (NS_FAILED(result)) {return result;}
michael@0:       if (!child) {return NS_ERROR_NULL_POINTER;}
michael@0:       child->GetNextSibling(getter_AddRefs(nextSibling));
michael@0:       result = mExistingRightNode->RemoveChild(child, getter_AddRefs(resultNode));
michael@0:       if (NS_SUCCEEDED(result)) 
michael@0:       {
michael@0:         result = mNewLeftNode->AppendChild(child, getter_AddRefs(resultNode));
michael@0:       }
michael@0:       child = do_QueryInterface(nextSibling);
michael@0:     }
michael@0:   }
michael@0:   // second, re-insert the left node into the tree 
michael@0:   result = mParent->InsertBefore(mNewLeftNode, mExistingRightNode, getter_AddRefs(resultNode));
michael@0:   return result;
michael@0: }
michael@0: 
michael@0: 
michael@0: NS_IMETHODIMP SplitElementTxn::GetTxnDescription(nsAString& aString)
michael@0: {
michael@0:   aString.AssignLiteral("SplitElementTxn");
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP SplitElementTxn::GetNewNode(nsIDOMNode **aNewNode)
michael@0: {
michael@0:   NS_ENSURE_TRUE(aNewNode, NS_ERROR_NULL_POINTER);
michael@0:   NS_ENSURE_TRUE(mNewLeftNode, NS_ERROR_NOT_INITIALIZED);
michael@0:   *aNewNode = mNewLeftNode;
michael@0:   NS_ADDREF(*aNewNode);
michael@0:   return NS_OK;
michael@0: }