gecko-dev/editor/base/SplitElementTxn.cpp

227 lines
6.8 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "SplitElementTxn.h"
#include "nsEditor.h"
#include "nsIDOMNode.h"
#include "nsIDOMSelection.h"
#include "nsIDOMCharacterData.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
// note that aEditor is not refcounted
SplitElementTxn::SplitElementTxn()
: EditTxn()
{
}
NS_IMETHODIMP SplitElementTxn::Init(nsIEditor *aEditor,
nsIDOMNode *aNode,
PRInt32 aOffset)
{
mEditor = aEditor;
mExistingRightNode = do_QueryInterface(aNode);
mOffset = aOffset;
return NS_OK;
}
SplitElementTxn::~SplitElementTxn()
{
}
NS_IMETHODIMP SplitElementTxn::Do(void)
{
if (gNoisy) { printf("%p Do Split of node %p offset %d\n", this, mExistingRightNode.get(), mOffset); }
NS_ASSERTION(mExistingRightNode, "bad state");
if (!mExistingRightNode) {
return NS_ERROR_NOT_INITIALIZED;
}
// create a new node
nsresult result = mExistingRightNode->CloneNode(PR_FALSE, getter_AddRefs(mNewLeftNode));
NS_ASSERTION(((NS_SUCCEEDED(result)) && (mNewLeftNode)), "could not create element.");
if ((NS_SUCCEEDED(result)) && (mNewLeftNode))
{
if (gNoisy) { printf(" created left node = %p\n", mNewLeftNode.get()); }
// get the parent node
result = mExistingRightNode->GetParentNode(getter_AddRefs(mParent));
// insert the new node
if ((NS_SUCCEEDED(result)) && (mParent))
{
result = nsEditor::SplitNodeImpl(mExistingRightNode, mOffset, mNewLeftNode, mParent);
if (NS_SUCCEEDED(result) && mNewLeftNode)
{
nsCOMPtr<nsIDOMSelection>selection;
mEditor->GetSelection(getter_AddRefs(selection));
if (selection)
{
selection->Collapse(mNewLeftNode, mOffset);
}
}
else {
result = NS_ERROR_NOT_IMPLEMENTED;
}
}
}
return result;
}
NS_IMETHODIMP SplitElementTxn::Undo(void)
{
if (gNoisy) {
printf("%p Undo Split of existing node %p and new node %p offset %d\n",
this, mExistingRightNode.get(), mNewLeftNode.get(), mOffset);
}
NS_ASSERTION(mExistingRightNode && mNewLeftNode && mParent, "bad state");
if (!mExistingRightNode || !mNewLeftNode || !mParent) {
return NS_ERROR_NOT_INITIALIZED;
}
// this assumes Do inserted the new node in front of the prior existing node
nsresult result;
result = nsEditor::JoinNodesImpl(mExistingRightNode, mNewLeftNode, mParent, PR_FALSE);
if (gNoisy)
{
printf("** after join left child node %p into right node %p\n", mNewLeftNode.get(), mExistingRightNode.get());
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
if (NS_SUCCEEDED(result))
{
if (gNoisy) { printf(" left node = %p removed\n", mNewLeftNode.get()); }
nsCOMPtr<nsIDOMSelection>selection;
mEditor->GetSelection(getter_AddRefs(selection));
if (selection)
{
selection->Collapse(mExistingRightNode, mOffset);
}
}
else {
result = NS_ERROR_NOT_IMPLEMENTED;
}
return result;
}
/* redo cannot simply resplit the right node, because subsequent transactions
* on the redo stack may depend on the left node existing in its previous state.
*/
NS_IMETHODIMP SplitElementTxn::Redo(void)
{
NS_ASSERTION(mExistingRightNode && mNewLeftNode && mParent, "bad state");
if (!mExistingRightNode || !mNewLeftNode || !mParent) {
return NS_ERROR_NOT_INITIALIZED;
}
if (gNoisy) {
printf("%p Redo Split of existing node %p and new node %p offset %d\n",
this, mExistingRightNode.get(), mNewLeftNode.get(), mOffset);
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
nsresult result;
nsCOMPtr<nsIDOMNode>resultNode;
// first, massage the existing node so it is in its post-split state
nsCOMPtr<nsIDOMCharacterData>rightNodeAsText;
rightNodeAsText = do_QueryInterface(mExistingRightNode);
if (rightNodeAsText)
{
result = rightNodeAsText->DeleteData(0, mOffset);
if (gNoisy)
{
printf("** after delete of text in right text node %p offset %d\n", rightNodeAsText.get(), mOffset);
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
}
else
{
nsCOMPtr<nsIDOMNode>child;
nsCOMPtr<nsIDOMNode>nextSibling;
result = mExistingRightNode->GetFirstChild(getter_AddRefs(child));
PRInt32 i;
for (i=0; i<mOffset; i++)
{
if (NS_FAILED(result)) {return result;}
if (!child) {return NS_ERROR_NULL_POINTER;}
child->GetNextSibling(getter_AddRefs(nextSibling));
result = mExistingRightNode->RemoveChild(child, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result))
{
result = mNewLeftNode->AppendChild(child, getter_AddRefs(resultNode));
if (gNoisy)
{
printf("** move child node %p from right node %p to left node %p\n", child.get(), mExistingRightNode.get(), mNewLeftNode.get());
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
}
child = do_QueryInterface(nextSibling);
}
}
// second, re-insert the left node into the tree
result = mParent->InsertBefore(mNewLeftNode, mExistingRightNode, getter_AddRefs(resultNode));
if (gNoisy)
{
printf("** reinsert left child node %p before right node %p\n", mNewLeftNode.get(), mExistingRightNode.get());
if (gNoisy) {mEditor->DebugDumpContent(); } // DEBUG
}
return result;
}
NS_IMETHODIMP SplitElementTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Join Element";
}
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Split Element";
}
return NS_OK;
}
NS_IMETHODIMP SplitElementTxn::GetNewNode(nsIDOMNode **aNewNode)
{
if (!aNewNode)
return NS_ERROR_NULL_POINTER;
if (!mNewLeftNode)
return NS_ERROR_NOT_INITIALIZED;
*aNewNode = mNewLeftNode;
NS_ADDREF(*aNewNode);
return NS_OK;
}