pjs/editor/base/nsEditor.cpp

1566 строки
44 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 "nsIDOMDocument.h"
#include "nsEditor.h"
#include "nsIDOMText.h"
#include "nsIDOMElement.h"
#include "nsIDOMAttr.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMRange.h"
#include "nsIDocument.h"
#include "nsIServiceManager.h"
#include "nsEditFactory.h"
#include "nsTextEditFactory.h"
#include "nsEditorCID.h"
#include "nsTransactionManagerCID.h"
#include "nsITransactionManager.h"
#include "nsIPresShell.h"
#include "nsIViewManager.h"
#include "nsIDOMSelection.h"
#include "nsIEnumerator.h"
#include "nsIAtom.h"
#include "nsVoidArray.h"
#include "nsICaret.h"
#include "nsIContent.h" // for temp method GetColIndexForCell, to be removed
#include "nsITableCellLayout.h" // for temp method GetColIndexForCell, to be removed
// transactions the editor knows how to build
#include "TransactionFactory.h"
#include "EditAggregateTxn.h"
#include "ChangeAttributeTxn.h"
#include "CreateElementTxn.h"
#include "DeleteElementTxn.h"
#include "InsertTextTxn.h"
#include "DeleteTextTxn.h"
#include "DeleteRangeTxn.h"
#include "SplitElementTxn.h"
#include "JoinElementTxn.h"
static NS_DEFINE_IID(kIContentIID, NS_ICONTENT_IID);
static NS_DEFINE_IID(kIDOMTextIID, NS_IDOMTEXT_IID);
static NS_DEFINE_IID(kIDOMElementIID, NS_IDOMELEMENT_IID);
static NS_DEFINE_IID(kIDOMNodeIID, NS_IDOMNODE_IID);
static NS_DEFINE_IID(kIDOMSelectionIID, NS_IDOMSELECTION_IID);
static NS_DEFINE_IID(kIDOMRangeIID, NS_IDOMRANGE_IID);
static NS_DEFINE_IID(kIDOMDocumentIID, NS_IDOMDOCUMENT_IID);
static NS_DEFINE_IID(kIDocumentIID, NS_IDOCUMENT_IID);
static NS_DEFINE_IID(kIFactoryIID, NS_IFACTORY_IID);
static NS_DEFINE_IID(kIEditFactoryIID, NS_IEDITORFACTORY_IID);
static NS_DEFINE_IID(kIEditorIID, NS_IEDITOR_IID);
static NS_DEFINE_IID(kIEditorSupportIID, NS_IEDITORSUPPORT_IID);
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
static NS_DEFINE_IID(kEditorCID, NS_EDITOR_CID);
static NS_DEFINE_CID(kTextEditorCID, NS_TEXTEDITOR_CID);
// transaction manager
static NS_DEFINE_IID(kITransactionManagerIID, NS_ITRANSACTIONMANAGER_IID);
static NS_DEFINE_CID(kCTransactionManagerFactoryCID, NS_TRANSACTION_MANAGER_FACTORY_CID);
// transactions
static NS_DEFINE_IID(kEditAggregateTxnIID, EDIT_AGGREGATE_TXN_IID);
static NS_DEFINE_IID(kInsertTextTxnIID, INSERT_TEXT_TXN_IID);
static NS_DEFINE_IID(kDeleteTextTxnIID, DELETE_TEXT_TXN_IID);
static NS_DEFINE_IID(kCreateElementTxnIID, CREATE_ELEMENT_TXN_IID);
static NS_DEFINE_IID(kDeleteElementTxnIID, DELETE_ELEMENT_TXN_IID);
static NS_DEFINE_IID(kDeleteRangeTxnIID, DELETE_RANGE_TXN_IID);
static NS_DEFINE_IID(kChangeAttributeTxnIID,CHANGE_ATTRIBUTE_TXN_IID);
static NS_DEFINE_IID(kSplitElementTxnIID, SPLIT_ELEMENT_TXN_IID);
static NS_DEFINE_IID(kJoinElementTxnIID, JOIN_ELEMENT_TXN_IID);
#ifdef XP_PC
#define TRANSACTION_MANAGER_DLL "txmgr.dll"
#else
#ifdef XP_MAC
#define TRANSACTION_MANAGER_DLL "TRANSACTION_MANAGER_DLL"
#else // XP_UNIX
#define TRANSACTION_MANAGER_DLL "libtxmgr.so"
#endif
#endif
/* ----- TEST METHODS DECLARATIONS ----- */
// Methods defined here are TEMPORARY
nsresult
GetColIndexForCell(nsIPresShell *aPresShell, nsIDOMNode *aCellNode, PRInt32 &aCellIndex);
/* ----- END TEST METHOD DECLARATIONS ----- */
PRInt32 nsEditor::gInstanceCount = 0;
//monitor for the editor
PRMonitor *getEditorMonitor() //if more than one person asks for the monitor at the same time for the FIRST time, we are screwed
{
static PRMonitor *ns_editlock = nsnull;
if (nsnull == ns_editlock)
{
ns_editlock = (PRMonitor *)1; //how long will the next line take? lets cut down on the chance of reentrancy
ns_editlock = PR_NewMonitor();
}
else if ((PRMonitor *)1 == ns_editlock)
return getEditorMonitor();
return ns_editlock;
}
/*
we must be good providers of factories ect. this is where to put ALL editor exports
*/
//BEGIN EXPORTS
extern "C" NS_EXPORT nsresult NSGetFactory(const nsCID & aClass,
nsISupports * aServiceMgr,
nsIFactory ** aFactory)
{
if (nsnull == aFactory) {
return NS_ERROR_NULL_POINTER;
}
*aFactory = nsnull;
if (aClass.Equals(kEditorCID)) {
return GetEditFactory(aFactory, aClass);
}
else if (aClass.Equals(kTextEditorCID)) {
return GetTextEditFactory(aFactory, aClass);
}
return NS_NOINTERFACE;
}
extern "C" NS_EXPORT PRBool
NSCanUnload(void)
{
return nsEditor::gInstanceCount; //I have no idea. I am copying code here
}
extern "C" NS_EXPORT nsresult
NSRegisterSelf(const char *path)
{
return nsRepository::RegisterFactory(kIEditFactoryIID, path,
PR_TRUE, PR_TRUE); //this will register the factory with the xpcom dll.
}
extern "C" NS_EXPORT nsresult
NSUnregisterSelf(const char *path)
{
return nsRepository::UnregisterFactory(kIEditFactoryIID, path);//this will unregister the factory with the xpcom dll.
}
//END EXPORTS
//class implementations are in order they are declared in nsEditor.h
nsEditor::nsEditor()
{
//initialize member variables here
NS_INIT_REFCNT();
PR_EnterMonitor(getEditorMonitor());
gInstanceCount++;
PR_ExitMonitor(getEditorMonitor());
}
nsEditor::~nsEditor()
{
NS_IF_RELEASE(mPresShell);
NS_IF_RELEASE(mViewManager);
}
//BEGIN nsIEditor interface implementations
NS_IMPL_ADDREF(nsEditor)
NS_IMPL_RELEASE(nsEditor)
nsresult
nsEditor::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
if (nsnull == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kISupportsIID)) {
nsIEditor *tmp = this;
nsISupports *tmp2 = tmp;
*aInstancePtr = (void*)tmp2;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIEditorIID)) {
*aInstancePtr = (void*)(nsIEditor*)this;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIEditorSupportIID)) {
*aInstancePtr = (void*)(nsIEditorSupport*)this;
NS_ADDREF_THIS();
return NS_OK;
}
return NS_NOINTERFACE;
}
nsresult
nsEditor::GetDocument(nsIDOMDocument **aDoc)
{
*aDoc = nsnull; // init out param
NS_PRECONDITION(mDoc, "bad state, null mDoc");
if (!mDoc)
return NS_ERROR_NULL_POINTER;
return mDoc->QueryInterface(kIDOMDocumentIID, (void **)aDoc);
}
nsresult
nsEditor::GetSelection(nsIDOMSelection **aSelection)
{
if (!aSelection)
return NS_ERROR_NULL_POINTER;
*aSelection = nsnull;
nsresult result = mPresShell->GetSelection(aSelection); // does an addref
return result;
}
nsresult
nsEditor::Init(nsIDOMDocument *aDoc, nsIPresShell* aPresShell)
{
NS_PRECONDITION(nsnull!=aDoc && nsnull!=aPresShell, "bad arg");
if ((nsnull==aDoc) || (nsnull==aPresShell))
return NS_ERROR_NULL_POINTER;
mDoc = do_QueryInterface(aDoc);
mPresShell = aPresShell;
NS_ADDREF(mPresShell);
mPresShell->GetViewManager(&mViewManager);
mUpdateCount=0;
InsertTextTxn::ClassInit();
/* Show the caret */
nsCOMPtr<nsICaret> caret;
if (NS_SUCCEEDED(mPresShell->GetCaret(getter_AddRefs(caret))))
{
caret->SetCaretVisible(PR_TRUE);
caret->SetCaretReadOnly(PR_FALSE);
}
NS_POSTCONDITION(mDoc && mPresShell, "bad state");
return NS_OK;
}
nsresult
nsEditor::EnableUndo(PRBool aEnable)
{
nsITransactionManager *txnMgr = 0;
nsresult result=NS_OK;
/** -- temp code until the txn mgr auto-registers -- **/
nsRepository::RegisterFactory(kCTransactionManagerFactoryCID,
TRANSACTION_MANAGER_DLL, PR_FALSE, PR_FALSE);
/** -- end temp code -- **/
if (PR_TRUE==aEnable)
{
if (!mTxnMgr)
{
result = nsRepository::CreateInstance(kCTransactionManagerFactoryCID,
nsnull,
kITransactionManagerIID, (void **)&txnMgr);
if (NS_FAILED(result) || !txnMgr) {
printf("ERROR: Failed to get TransactionManager instance.\n");
return NS_ERROR_NOT_AVAILABLE;
}
mTxnMgr = do_QueryInterface(txnMgr); // CreateInstance refCounted the instance for us, remember it in an nsCOMPtr
}
}
else
{ // disable the transaction manager if it is enabled
if (mTxnMgr)
{
mTxnMgr = do_QueryInterface(nsnull);
}
}
return result;
}
nsresult nsEditor::CanUndo(PRBool &aIsEnabled, PRBool &aCanUndo)
{
aIsEnabled = ((PRBool)((nsITransactionManager *)0!=mTxnMgr.get()));
if (aIsEnabled)
{
PRInt32 numTxns=0;
mTxnMgr->GetNumberOfUndoItems(&numTxns);
aCanUndo = ((PRBool)(0==numTxns));
}
else {
aCanUndo = PR_FALSE;
}
return NS_OK;
}
nsresult nsEditor::CanRedo(PRBool &aIsEnabled, PRBool &aCanRedo)
{
aIsEnabled = ((PRBool)((nsITransactionManager *)0!=mTxnMgr.get()));
if (aIsEnabled)
{
PRInt32 numTxns=0;
mTxnMgr->GetNumberOfRedoItems(&numTxns);
aCanRedo = ((PRBool)(0==numTxns));
}
else {
aCanRedo = PR_FALSE;
}
return NS_OK;
}
nsresult
nsEditor::SetProperties(nsVoidArray *aPropList)
{
return NS_OK;
}
nsresult
nsEditor::GetProperties(nsVoidArray *aPropList)
{
return NS_OK;
}
nsresult
nsEditor::SetAttribute(nsIDOMElement *aElement, const nsString& aAttribute, const nsString& aValue)
{
ChangeAttributeTxn *txn;
nsresult result = CreateTxnForSetAttribute(aElement, aAttribute, aValue, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
return result;
}
nsresult
nsEditor::CreateTxnForSetAttribute(nsIDOMElement *aElement,
const nsString& aAttribute,
const nsString& aValue,
ChangeAttributeTxn ** aTxn)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (nsnull != aElement)
{
result = TransactionFactory::GetNewTransaction(kChangeAttributeTxnIID, (EditTxn **)aTxn);
if (NS_SUCCEEDED(result)) {
result = (*aTxn)->Init(this, aElement, aAttribute, aValue, PR_FALSE);
}
}
return result;
}
nsresult
nsEditor::GetAttributeValue(nsIDOMElement *aElement,
const nsString& aAttribute,
nsString& aResultValue,
PRBool& aResultIsSet)
{
aResultIsSet=PR_FALSE;
nsresult result=NS_OK;
if (nsnull!=aElement)
{
nsCOMPtr<nsIDOMAttr> attNode;
result = aElement->GetAttributeNode(aAttribute, getter_AddRefs(attNode));
if ((NS_SUCCEEDED(result)) && attNode)
{
attNode->GetSpecified(&aResultIsSet);
attNode->GetValue(aResultValue);
}
}
return result;
}
nsresult
nsEditor::RemoveAttribute(nsIDOMElement *aElement, const nsString& aAttribute)
{
ChangeAttributeTxn *txn;
nsresult result = CreateTxnForRemoveAttribute(aElement, aAttribute, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
return result;
}
nsresult
nsEditor::CreateTxnForRemoveAttribute(nsIDOMElement *aElement,
const nsString& aAttribute,
ChangeAttributeTxn ** aTxn)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (nsnull != aElement)
{
result = TransactionFactory::GetNewTransaction(kChangeAttributeTxnIID, (EditTxn **)aTxn);
if (NS_SUCCEEDED(result))
{
nsAutoString value;
result = (*aTxn)->Init(this, aElement, aAttribute, value, PR_TRUE);
}
}
return result;
}
nsresult
nsEditor::InsertBreak(PRBool aCtrlKey)
{
if (aCtrlKey)
{
// nsSelectionRange range;
//mSelectionP->GetRange(&range);
}
else
{
}
return NS_OK;
}
//END nsIEditorInterfaces
//BEGIN nsEditor Private methods
nsresult
nsEditor::GetFirstNodeOfType(nsIDOMNode *aStartNode, const nsString &aTag, nsIDOMNode **aResult)
{
nsresult result=NS_OK;
if (!mDoc)
return NS_ERROR_NULL_POINTER;
if (!aResult)
return NS_ERROR_NULL_POINTER;
/* If no node set, get root node */
nsCOMPtr<nsIDOMNode> node;
nsCOMPtr<nsIDOMElement> element;
if (nsnull==aStartNode)
{
mDoc->GetDocumentElement(getter_AddRefs(element));
result = element->QueryInterface(kIDOMNodeIID,getter_AddRefs(node));
if (NS_FAILED(result))
return result;
if (!node)
return NS_ERROR_NULL_POINTER;
}
else
node = do_QueryInterface(aStartNode);
*aResult = nsnull;
nsCOMPtr<nsIDOMNode> childNode;
result = node->GetFirstChild(getter_AddRefs(childNode));
while (childNode)
{
result = childNode->QueryInterface(kIDOMNodeIID,getter_AddRefs(element));
nsAutoString tag;
if (NS_SUCCEEDED(result) && (element))
{
element->GetTagName(tag);
if (PR_TRUE==aTag.Equals(tag))
{
return (childNode->QueryInterface(kIDOMNodeIID,(void **) aResult)); // does the addref
}
else
{
nsresult result = GetFirstNodeOfType(childNode, aTag, aResult);
if (nsnull!=*aResult)
return result;
}
}
nsCOMPtr<nsIDOMNode> temp = childNode;
temp->GetNextSibling(getter_AddRefs(childNode));
}
return NS_ERROR_FAILURE;
}
nsresult
nsEditor::GetFirstTextNode(nsIDOMNode *aNode, nsIDOMNode **aRetNode)
{
if (!aNode || !aRetNode)
{
NS_NOTREACHED("GetFirstTextNode Failed");
return NS_ERROR_NULL_POINTER;
}
PRUint16 mType;
PRBool mCNodes;
nsCOMPtr<nsIDOMNode> answer;
aNode->GetNodeType(&mType);
if (nsIDOMNode::ELEMENT_NODE == mType) {
if (NS_SUCCEEDED(aNode->HasChildNodes(&mCNodes)) && PR_TRUE == mCNodes)
{
nsCOMPtr<nsIDOMNode> node1;
nsCOMPtr<nsIDOMNode> node2;
if (!NS_SUCCEEDED(aNode->GetFirstChild(getter_AddRefs(node1))))
{
NS_NOTREACHED("GetFirstTextNode Failed");
}
while(!answer && node1)
{
GetFirstTextNode(node1, getter_AddRefs(answer));
node1->GetNextSibling(getter_AddRefs(node2));
node1 = node2;
}
}
}
else if (nsIDOMNode::TEXT_NODE == mType) {
answer = do_QueryInterface(aNode);
}
// OK, now return the answer, if any
*aRetNode = answer;
if (*aRetNode)
NS_IF_ADDREF(*aRetNode);
else
return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult
nsEditor::Do(nsITransaction *aTxn)
{
nsresult result = NS_OK;
if (nsnull!=aTxn)
{
if ((nsITransactionManager *)nsnull!=mTxnMgr.get())
{
result = mTxnMgr->Do(aTxn);
}
else
{
result = aTxn->Do();
}
}
return result;
}
nsresult
nsEditor::Undo(PRUint32 aCount)
{
nsresult result = NS_OK;
if ((nsITransactionManager *)nsnull!=mTxnMgr.get())
{
PRUint32 i=0;
for ( ; i<aCount; i++)
{
result = mTxnMgr->Undo();
if (NS_FAILED(result))
break;
}
}
return result;
}
nsresult
nsEditor::Redo(PRUint32 aCount)
{
nsresult result = NS_OK;
if ((nsITransactionManager *)nsnull!=mTxnMgr.get())
{
PRUint32 i=0;
for ( ; i<aCount; i++)
{
result = mTxnMgr->Redo();
if (NS_FAILED(result))
break;
}
}
return result;
}
nsresult
nsEditor::BeginTransaction()
{
NS_PRECONDITION(mUpdateCount>=0, "bad state");
if (nsnull!=mViewManager)
{
if (0==mUpdateCount)
mViewManager->DisableRefresh();
mUpdateCount++;
}
if ((nsITransactionManager *)nsnull!=mTxnMgr.get())
{
mTxnMgr->BeginBatch();
}
return NS_OK;
}
nsresult
nsEditor::EndTransaction()
{
NS_PRECONDITION(mUpdateCount>0, "bad state");
if (nsnull!=mViewManager)
{
mUpdateCount--;
if (0==mUpdateCount)
mViewManager->EnableRefresh();
}
if ((nsITransactionManager *)nsnull!=mTxnMgr.get())
{
mTxnMgr->EndBatch();
}
return NS_OK;
}
nsresult nsEditor::ScrollIntoView(PRBool aScrollToBegin)
{
return NS_OK; //mjudge we should depricate this method
/* nsresult result;
if (mPresShell)
{
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection)
{
// get the content of the start of the selection
nsCOMPtr<nsIDOMNode>startNode;
PRInt32 offset;
result = selection->GetAnchorNodeAndOffset(getter_AddRefs(startNode), &offset);
if (NS_SUCCEEDED(result) && startNode)
{ // get the content from the node
nsCOMPtr<nsIContent>startContent;
result = startNode->QueryInterface(kIContentIID, getter_AddRefs(startContent));
if (NS_SUCCEEDED(result) && startContent)
{ // get its frame
nsIFrame *frame=nsnull;
result = mPresShell->GetPrimaryFrameFor(startContent, &frame);
if (NS_SUCCEEDED(result) && frame)
{ // scroll that frame into view
result = mPresShell->ScrollFrameIntoView(frame,
0, NS_PRESSHELL_SCROLL_TOP |NS_PRESSHELL_SCROLL_ANYWHERE,
0, NS_PRESSHELL_SCROLL_LEFT|NS_PRESSHELL_SCROLL_ANYWHERE);
}
}
}
}
}
else {
result = NS_ERROR_NOT_INITIALIZED;
}
return result;
*/
}
nsresult nsEditor::CreateNode(const nsString& aTag,
nsIDOMNode * aParent,
PRInt32 aPosition)
{
CreateElementTxn *txn;
nsresult result = CreateTxnForCreateElement(aTag, aParent, aPosition, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
return result;
}
nsresult nsEditor::CreateTxnForCreateElement(const nsString& aTag,
nsIDOMNode *aParent,
PRInt32 aPosition,
CreateElementTxn ** aTxn)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (nsnull != aParent)
{
result = TransactionFactory::GetNewTransaction(kCreateElementTxnIID, (EditTxn **)aTxn);
if (NS_SUCCEEDED(result)) {
result = (*aTxn)->Init(this, aTag, aParent, aPosition);
}
}
return result;
}
nsresult nsEditor::InsertNode(nsIDOMNode * aNode,
nsIDOMNode * aParent,
PRInt32 aPosition)
{
// GetLayoutObjectFor test
nsAutoString cellTag("TD");
nsCOMPtr<nsIDOMNode> node;
if (NS_SUCCEEDED(GetFirstNodeOfType(nsnull, cellTag, getter_AddRefs(node))))
{
PRInt32 cellIndex;
GetColIndexForCell(mPresShell, node, cellIndex);
printf("%d\n", cellIndex);
}
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult nsEditor::DeleteNode(nsIDOMNode * aElement)
{
DeleteElementTxn *txn;
nsresult result = CreateTxnForDeleteElement(aElement, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
return result;
}
nsresult nsEditor::CreateTxnForDeleteElement(nsIDOMNode * aElement,
DeleteElementTxn ** aTxn)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (nsnull != aElement)
{
result = TransactionFactory::GetNewTransaction(kDeleteElementTxnIID, (EditTxn **)aTxn);
if (NS_SUCCEEDED(result)) {
result = (*aTxn)->Init(aElement);
}
}
return result;
}
nsresult
nsEditor::InsertText(const nsString& aStringToInsert)
{
nsresult result;
EditAggregateTxn *aggTxn;
result = TransactionFactory::GetNewTransaction(kEditAggregateTxnIID, (EditTxn **)&aggTxn);
if ((NS_FAILED(result)) || (nsnull==aggTxn)) {
return NS_ERROR_OUT_OF_MEMORY;
}
aggTxn->SetName(InsertTextTxn::gInsertTextTxnName);
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection)
{
PRBool collapsed;
result = selection->IsCollapsed(&collapsed);
if (NS_SUCCEEDED(result) && !collapsed) {
EditAggregateTxn *delSelTxn;
result = CreateTxnForDeleteSelection(nsIEditor::eLTR, &delSelTxn);
if (NS_SUCCEEDED(result) && delSelTxn) {
aggTxn->AppendChild(delSelTxn);
}
}
}
InsertTextTxn *txn;
result = CreateTxnForInsertText(aStringToInsert, &txn);
if ((NS_SUCCEEDED(result)) && txn) {
aggTxn->AppendChild(txn);
result = Do(aggTxn);
}
return result;
}
nsresult nsEditor::CreateTxnForInsertText(const nsString & aStringToInsert,
InsertTextTxn ** aTxn)
{
nsresult result;
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if ((NS_SUCCEEDED(result)) && selection)
{
result = NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIEnumerator> enumerator;
enumerator = do_QueryInterface(selection,&result);
if (enumerator)
{
enumerator->First();
nsISupports *currentItem;
result = enumerator->CurrentItem(&currentItem);
if ((NS_SUCCEEDED(result)) && (nsnull!=currentItem))
{
result = NS_ERROR_UNEXPECTED;
// XXX: we'll want to deleteRange if the selection isn't just an insertion point
// for now, just insert text after the start of the first node
nsCOMPtr<nsIDOMRange> range(currentItem);
if (range)
{
nsCOMPtr<nsIDOMNode> node;
result = range->GetStartParent(getter_AddRefs(node));
if ((NS_SUCCEEDED(result)) && (node))
{
result = NS_ERROR_UNEXPECTED;
nsCOMPtr<nsIDOMCharacterData> nodeAsText;
nodeAsText = do_QueryInterface(node,&result);
if (nodeAsText)
{
PRInt32 offset;
range->GetStartOffset(&offset);
result = TransactionFactory::GetNewTransaction(kInsertTextTxnIID, (EditTxn **)aTxn);
if (nsnull!=*aTxn) {
result = (*aTxn)->Init(nodeAsText, offset, aStringToInsert, mPresShell);
}
else
result = NS_ERROR_OUT_OF_MEMORY;
}
}
}
}
}
}
return result;
}
nsresult nsEditor::DeleteText(nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aLength)
{
DeleteTextTxn *txn;
nsresult result = CreateTxnForDeleteText(aElement, aOffset, aLength, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
return result;
}
nsresult nsEditor::CreateTxnForDeleteText(nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aLength,
DeleteTextTxn **aTxn)
{
nsresult result=NS_ERROR_NULL_POINTER;
if (nsnull != aElement)
{
result = TransactionFactory::GetNewTransaction(kDeleteTextTxnIID, (EditTxn **)aTxn);
if (NS_SUCCEEDED(result)) {
result = (*aTxn)->Init(this, aElement, aOffset, aLength);
}
}
return result;
}
// operates on selection
// deletes the selection (if not collapsed) and splits the current element
// or an ancestor of the current element
/* context-dependent behaviors
SELECTION ACTION
text node split text node (or a parent)
block element insert a <BR>
H1-H6 if at end, create a <P> following the header
*/
#if 0 // THIS CODE WILL BE REMOVED. WE ARE GOING TO IMPLEMENT
// A GENERIC HANDLER SYSTEM.
nsresult nsEditor::CreateTxnToHandleEnterKey(EditAggregateTxn **aTxn)
{
// allocate the out-param transaction
nsresult result = TransactionFactory::GetNewTransaction(kEditAggregateTxnIID, (EditTxn **)aTxn);
if (NS_FAILED(result))
{
return result;
}
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if ((NS_SUCCEEDED(result)) && selection)
{
nsCOMPtr<nsIEnumerator> enumerator;
enumerator = selection;
if (enumerator)
{
// XXX: need to handle mutliple ranges here, probably by
// disallowing the operation
for (enumerator->First(); NS_OK!=enumerator->IsDone(); enumerator->Next())
{
nsISupports *currentItem=nsnull;
result = enumerator->CurrentItem(&currentItem);
if ((NS_SUCCEEDED(result)) && (currentItem))
{
nsCOMPtr<nsIDOMRange> range(currentItem);
PRBool isCollapsed;
range->GetIsCollapsed(&isCollapsed);
if(PR_FALSE==isCollapsed)
{
EditAggregateTxn *delSelTxn;
result = CreateTxnForDeleteSelection(nsIEditor::eLTR, &delSelTxn);
if ((NS_SUCCEEDED(result)) && (delSelTtxn)) {
(*aTxn)->AppendChild(delSelTtxn);
}
}
// at this point, we have a collapsed selection
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMNode> node;
result = range->GetStartParent(getter_AddRefs(node));
if (NS_SUCCEEDED(result))
{
nsVoidArray parentFrameList;
result = GetParentFrameList(node, &parentFrameList);
if (NS_SUCCEEDED(result))
{
EditAggregateTxn *enterKeyTxn;
result = CreateTxnForEnterKeyAtInsertionPoint(range, &enterKeyTxn));
if ((NS_SUCCEEDED(result)) && (enterKeyTxn)) {
(*aTxn)->AppendChild(enterKeyTxn);
}
}
}
}
}
}
}
}
// if anything along the way failed, delete the out-param transaction
if (NS_FAILED(result)) {
NS_IF_RELEASE(*aTxn);
}
return result;
}
#endif
#define DELETE_SELECTION_DOESNT_GO_THROUGH_RANGE
nsresult
nsEditor::DeleteSelection(nsIEditor::Direction aDir)
{
nsresult result;
#ifdef DELETE_SELECTION_DOESNT_GO_THROUGH_RANGE
EditAggregateTxn *txn;
result = CreateTxnForDeleteSelection(aDir, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
#else
// XXX Warning, this should be moved to a transaction since
// calling it this way means undo won't work.
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection)
result = selection->DeleteFromDocument();
#endif
return result;
}
nsresult nsEditor::CreateTxnForDeleteSelection(nsIEditor::Direction aDir,
EditAggregateTxn ** aTxn)
{
if (!aTxn)
return NS_ERROR_NULL_POINTER;
*aTxn = nsnull;
nsresult result;
// allocate the out-param transaction
result = TransactionFactory::GetNewTransaction(kEditAggregateTxnIID, (EditTxn **)aTxn);
if (NS_FAILED(result)) {
return result;
}
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(getter_AddRefs(selection));
if ((NS_SUCCEEDED(result)) && selection)
{
nsCOMPtr<nsIEnumerator> enumerator;
enumerator = do_QueryInterface(selection,&result);
if (enumerator)
{
for (enumerator->First(); NS_OK!=enumerator->IsDone(); enumerator->Next())
{
nsISupports *currentItem=nsnull;
result = enumerator->CurrentItem(&currentItem);
if ((NS_SUCCEEDED(result)) && (currentItem))
{
nsCOMPtr<nsIDOMRange> range(currentItem);
PRBool isCollapsed;
range->GetIsCollapsed(&isCollapsed);
if (PR_FALSE==isCollapsed)
{
DeleteRangeTxn *txn;
result = TransactionFactory::GetNewTransaction(kDeleteRangeTxnIID, (EditTxn **)&txn);
if ((NS_SUCCEEDED(result)) && (nsnull!=txn))
{
txn->Init(this, range);
(*aTxn)->AppendChild(txn);
}
else
result = NS_ERROR_OUT_OF_MEMORY;
}
else
{ // we have an insertion point. delete the thing in front of it or behind it, depending on aDir
result = CreateTxnForDeleteInsertionPoint(range, aDir, *aTxn);
}
}
}
}
}
// if we didn't build the transaction correctly, destroy the out-param transaction so we don't leak it.
if (NS_FAILED(result))
{
NS_IF_RELEASE(*aTxn);
}
return result;
}
//XXX: currently, this doesn't handle edge conditions because GetNext/GetPrior are not implemented
nsresult
nsEditor::CreateTxnForDeleteInsertionPoint(nsIDOMRange *aRange,
nsIEditor::Direction aDir,
EditAggregateTxn *aTxn)
{
nsCOMPtr<nsIDOMNode> node;
PRBool isFirst;
PRBool isLast;
PRInt32 offset;
PRInt32 length=1;
// get the node and offset of the insertion point
nsresult result = aRange->GetStartParent(getter_AddRefs(node));
if (NS_FAILED(result))
return result;
result = aRange->GetStartOffset(&offset);
if (NS_FAILED(result))
return result;
// determine if the insertion point is at the beginning, middle, or end of the node
nsCOMPtr<nsIDOMCharacterData> nodeAsText;
nodeAsText = do_QueryInterface(node, &result);
if (nodeAsText)
{
PRUint32 count;
nodeAsText->GetLength(&count);
isFirst = PRBool(0==offset);
isLast = PRBool(count==offset);
}
else
{
nsCOMPtr<nsIDOMNode> sibling;
result = node->GetPreviousSibling(getter_AddRefs(sibling));
if ((NS_SUCCEEDED(result)) && sibling)
isFirst = PR_FALSE;
else
isFirst = PR_TRUE;
result = node->GetNextSibling(getter_AddRefs(sibling));
if ((NS_SUCCEEDED(result)) && sibling)
isLast = PR_FALSE;
else
isLast = PR_TRUE;
}
// build a transaction for deleting the appropriate data
if ((nsIEditor::eRTL==aDir) && (PR_TRUE==isFirst))
{ // we're backspacing from the beginning of the node. Delete the first thing to our left
nsCOMPtr<nsIDOMNode> priorNode;
result = GetPriorNode(node, getter_AddRefs(priorNode));
if ((NS_SUCCEEDED(result)) && priorNode)
{ // there is a priorNode, so delete it's last child (if text content, delete the last char.)
// if it has no children, delete it
nsCOMPtr<nsIDOMCharacterData> priorNodeAsText;
priorNodeAsText = do_QueryInterface(priorNode, &result);
if (priorNodeAsText)
{
PRUint32 length=0;
priorNodeAsText->GetLength(&length);
if (0<length)
{
DeleteTextTxn *txn;
result = CreateTxnForDeleteText(priorNodeAsText, length-1, 1, &txn);
if (NS_SUCCEEDED(result)) {
aTxn->AppendChild(txn);
}
}
else
{ // XXX: can you have an empty text node? If so, what do you do?
printf("ERROR: found a text node with 0 characters\n");
result = NS_ERROR_UNEXPECTED;
}
}
else
{ // priorNode is not text, so tell it's parent to delete it
DeleteElementTxn *txn;
result = CreateTxnForDeleteElement(priorNode, &txn);
if (NS_SUCCEEDED(result)) {
aTxn->AppendChild(txn);
}
}
}
}
else if ((nsIEditor::eLTR==aDir) && (PR_TRUE==isLast))
{ // we're deleting from the end of the node. Delete the first thing to our right
nsCOMPtr<nsIDOMNode> nextNode;
result = GetNextNode(node, getter_AddRefs(nextNode));
if ((NS_SUCCEEDED(result)) && nextNode)
{ // there is a priorNode, so delete it's last child (if text content, delete the last char.)
// if it has no children, delete it
nsCOMPtr<nsIDOMCharacterData> nextNodeAsText;
nextNodeAsText = do_QueryInterface(nextNode,&result);
if (nextNodeAsText)
{
PRUint32 length=0;
nextNodeAsText->GetLength(&length);
if (0<length)
{
DeleteTextTxn *txn;
result = CreateTxnForDeleteText(nextNodeAsText, 0, 1, &txn);
if (NS_SUCCEEDED(result)) {
aTxn->AppendChild(txn);
}
}
else
{ // XXX: can you have an empty text node? If so, what do you do?
printf("ERROR: found a text node with 0 characters\n");
result = NS_ERROR_UNEXPECTED;
}
}
else
{ // nextNode is not text, so tell it's parent to delete it
DeleteElementTxn *txn;
result = CreateTxnForDeleteElement(nextNode, &txn);
if (NS_SUCCEEDED(result)) {
aTxn->AppendChild(txn);
}
}
}
}
else
{
if (nodeAsText)
{ // we have text, so delete a char at the proper offset
if (nsIEditor::eRTL==aDir) {
offset --;
}
DeleteTextTxn *txn;
result = CreateTxnForDeleteText(nodeAsText, offset, length, &txn);
if (NS_SUCCEEDED(result)) {
aTxn->AppendChild(txn);
}
}
else
{ // we're deleting a node
}
}
return result;
}
nsresult
nsEditor::GetPriorNode(nsIDOMNode *aCurrentNode, nsIDOMNode **aResultNode)
{
nsresult result;
*aResultNode = nsnull;
// if aCurrentNode has a left sibling, return that sibling's rightmost child (or itself if it has no children)
result = aCurrentNode->GetPreviousSibling(aResultNode);
if ((NS_SUCCEEDED(result)) && *aResultNode)
return GetRightmostChild(*aResultNode, aResultNode);
// otherwise, walk up the parent change until there is a child that comes before
// the ancestor of aCurrentNode. Then return that node's rightmost child
nsCOMPtr<nsIDOMNode> parent(do_QueryInterface(aCurrentNode));
do {
nsCOMPtr<nsIDOMNode> node(parent);
result = node->GetParentNode(getter_AddRefs(parent));
if ((NS_SUCCEEDED(result)) && parent)
{
result = parent->GetPreviousSibling(getter_AddRefs(node));
if ((NS_SUCCEEDED(result)) && node)
{
return GetRightmostChild(node, aResultNode);
}
}
} while ((NS_SUCCEEDED(result)) && parent);
return result;
}
nsresult
nsEditor::GetNextNode(nsIDOMNode *aCurrentNode, nsIDOMNode **aResultNode)
{
nsresult result;
*aResultNode = nsnull;
// if aCurrentNode has a left sibling, return that sibling's rightmost child (or itself if it has no children)
result = aCurrentNode->GetNextSibling(aResultNode);
if ((NS_SUCCEEDED(result)) && *aResultNode)
return GetLeftmostChild(*aResultNode, aResultNode);
// otherwise, walk up the parent change until there is a child that comes before
// the ancestor of aCurrentNode. Then return that node's rightmost child
nsCOMPtr<nsIDOMNode> parent(do_QueryInterface(aCurrentNode));
do {
nsCOMPtr<nsIDOMNode> node(parent);
result = node->GetParentNode(getter_AddRefs(parent));
if ((NS_SUCCEEDED(result)) && parent)
{
result = parent->GetNextSibling(getter_AddRefs(node));
if ((NS_SUCCEEDED(result)) && node)
{
return GetLeftmostChild(node, aResultNode);
}
}
} while ((NS_SUCCEEDED(result)) && parent);
return result;
}
nsresult
nsEditor::GetRightmostChild(nsIDOMNode *aCurrentNode, nsIDOMNode **aResultNode)
{
nsresult result = NS_OK;
nsCOMPtr<nsIDOMNode> resultNode(do_QueryInterface(aCurrentNode));
PRBool hasChildren;
resultNode->HasChildNodes(&hasChildren);
while ((NS_SUCCEEDED(result)) && (PR_TRUE==hasChildren))
{
nsCOMPtr<nsIDOMNode> temp(resultNode);
temp->GetLastChild(getter_AddRefs(resultNode));
resultNode->HasChildNodes(&hasChildren);
}
if (NS_SUCCEEDED(result)) {
*aResultNode = resultNode;
NS_ADDREF(*aResultNode);
}
return result;
}
nsresult
nsEditor::GetLeftmostChild(nsIDOMNode *aCurrentNode, nsIDOMNode **aResultNode)
{
nsresult result = NS_OK;
nsCOMPtr<nsIDOMNode> resultNode(do_QueryInterface(aCurrentNode));
PRBool hasChildren;
resultNode->HasChildNodes(&hasChildren);
while ((NS_SUCCEEDED(result)) && (PR_TRUE==hasChildren))
{
nsCOMPtr<nsIDOMNode> temp(resultNode);
temp->GetFirstChild(getter_AddRefs(resultNode));
resultNode->HasChildNodes(&hasChildren);
}
if (NS_SUCCEEDED(result)) {
*aResultNode = resultNode;
NS_ADDREF(*aResultNode);
}
return result;
}
nsresult
nsEditor::SplitNode(nsIDOMNode * aNode,
PRInt32 aOffset)
{
SplitElementTxn *txn;
nsresult result = CreateTxnForSplitNode(aNode, aOffset, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
return result;
}
nsresult nsEditor::CreateTxnForSplitNode(nsIDOMNode *aNode,
PRUint32 aOffset,
SplitElementTxn **aTxn)
{
nsresult result=NS_ERROR_NULL_POINTER;
if (nsnull != aNode)
{
result = TransactionFactory::GetNewTransaction(kSplitElementTxnIID, (EditTxn **)aTxn);
if (NS_SUCCEEDED(result)) {
result = (*aTxn)->Init(this, aNode, aOffset);
}
}
return result;
}
nsresult
nsEditor::JoinNodes(nsIDOMNode * aNodeToKeep,
nsIDOMNode * aNodeToJoin,
nsIDOMNode * aParent,
PRBool aNodeToKeepIsFirst)
{
JoinElementTxn *txn;
nsresult result = CreateTxnForJoinNode(aNodeToKeep, aNodeToJoin, &txn);
if (NS_SUCCEEDED(result)) {
result = Do(txn);
}
return result;
}
nsresult nsEditor::CreateTxnForJoinNode(nsIDOMNode *aLeftNode,
nsIDOMNode *aRightNode,
JoinElementTxn **aTxn)
{
nsresult result=NS_ERROR_NULL_POINTER;
if ((nsnull != aLeftNode) && (nsnull != aRightNode))
{
result = TransactionFactory::GetNewTransaction(kJoinElementTxnIID, (EditTxn **)aTxn);
if (NS_SUCCEEDED(result)) {
result = (*aTxn)->Init(this, aLeftNode, aRightNode);
}
}
return result;
}
nsresult
nsEditor::SplitNodeImpl(nsIDOMNode * aExistingRightNode,
PRInt32 aOffset,
nsIDOMNode* aNewLeftNode,
nsIDOMNode* aParent)
{
nsresult result;
NS_ASSERTION(((nsnull!=aExistingRightNode) &&
(nsnull!=aNewLeftNode) &&
(nsnull!=aParent)),
"null arg");
if ((nsnull!=aExistingRightNode) &&
(nsnull!=aNewLeftNode) &&
(nsnull!=aParent))
{
nsCOMPtr<nsIDOMNode> resultNode;
result = aParent->InsertBefore(aNewLeftNode, aExistingRightNode, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result))
{
// split the children between the 2 nodes
// at this point, aExistingRightNode has all the children
// move all the children whose index is < aOffset to aNewLeftNode
if (0<=aOffset) // don't bother unless we're going to move at least one child
{
// if it's a text node, just shuffle around some text
nsCOMPtr<nsIDOMCharacterData> rightNodeAsText(aExistingRightNode);
nsCOMPtr<nsIDOMCharacterData> leftNodeAsText(aNewLeftNode);
if (leftNodeAsText && rightNodeAsText)
{
// fix right node
nsString leftText;
rightNodeAsText->SubstringData(0, aOffset, leftText);
rightNodeAsText->DeleteData(0, aOffset);
// fix left node
leftNodeAsText->SetData(leftText);
}
else
{ // otherwise it's an interior node, so shuffle around the children
nsCOMPtr<nsIDOMNodeList> childNodes;
result = aExistingRightNode->GetChildNodes(getter_AddRefs(childNodes));
if ((NS_SUCCEEDED(result)) && (childNodes))
{
PRInt32 i=0;
for ( ; ((NS_SUCCEEDED(result)) && (i<aOffset)); i++)
{
nsCOMPtr<nsIDOMNode> childNode;
result = childNodes->Item(i, getter_AddRefs(childNode));
if ((NS_SUCCEEDED(result)) && (childNode))
{
result = aExistingRightNode->RemoveChild(childNode, getter_AddRefs(resultNode));
if (NS_SUCCEEDED(result))
{
result = aNewLeftNode->AppendChild(childNode, getter_AddRefs(resultNode));
}
}
}
}
}
}
}
}
else
result = NS_ERROR_INVALID_ARG;
return result;
}
nsresult
nsEditor::JoinNodesImpl(nsIDOMNode * aNodeToKeep,
nsIDOMNode * aNodeToJoin,
nsIDOMNode * aParent,
PRBool aNodeToKeepIsFirst)
{
nsresult result;
NS_ASSERTION(((nsnull!=aNodeToKeep) &&
(nsnull!=aNodeToJoin) &&
(nsnull!=aParent)),
"null arg");
if ((nsnull!=aNodeToKeep) &&
(nsnull!=aNodeToJoin) &&
(nsnull!=aParent))
{
// if it's a text node, just shuffle around some text
nsCOMPtr<nsIDOMCharacterData> keepNodeAsText(aNodeToKeep);
nsCOMPtr<nsIDOMCharacterData> joinNodeAsText(aNodeToJoin);
if (keepNodeAsText && joinNodeAsText)
{
nsString rightText;
nsString leftText;
if (aNodeToKeepIsFirst)
{
keepNodeAsText->GetData(leftText);
joinNodeAsText->GetData(rightText);
}
else
{
keepNodeAsText->GetData(rightText);
joinNodeAsText->GetData(leftText);
}
leftText += rightText;
keepNodeAsText->SetData(leftText);
}
else
{ // otherwise it's an interior node, so shuffle around the children
nsCOMPtr<nsIDOMNodeList> childNodes;
result = aNodeToJoin->GetChildNodes(getter_AddRefs(childNodes));
if ((NS_SUCCEEDED(result)) && (childNodes))
{
PRUint32 i;
PRUint32 childCount=0;
childNodes->GetLength(&childCount);
nsCOMPtr<nsIDOMNode> firstNode; //only used if aNodeToKeepIsFirst is false
if (PR_FALSE==aNodeToKeepIsFirst)
{ // remember the first child in aNodeToKeep, we'll insert all the children of aNodeToJoin in front of it
result = aNodeToKeep->GetFirstChild(getter_AddRefs(firstNode));
// GetFirstChild returns nsnull firstNode if aNodeToKeep has no children, that's ok.
}
nsCOMPtr<nsIDOMNode> resultNode;
for (i=0; ((NS_SUCCEEDED(result)) && (i<childCount)); i++)
{
nsCOMPtr<nsIDOMNode> childNode;
result = childNodes->Item(i, getter_AddRefs(childNode));
if ((NS_SUCCEEDED(result)) && (childNode))
{
if (PR_TRUE==aNodeToKeepIsFirst)
{ // append children of aNodeToJoin
result = aNodeToKeep->AppendChild(childNode, getter_AddRefs(resultNode));
}
else
{ // prepend children of aNodeToJoin
result = aNodeToKeep->InsertBefore(childNode, firstNode, getter_AddRefs(resultNode));
}
}
}
}
else if (!childNodes) {
result = NS_ERROR_NULL_POINTER;
}
}
if (NS_SUCCEEDED(result))
{ // delete the extra node
nsCOMPtr<nsIDOMNode> resultNode;
result = aParent->RemoveChild(aNodeToJoin, getter_AddRefs(resultNode));
}
}
else
result = NS_ERROR_INVALID_ARG;
return result;
}
nsresult nsIEditorSupport::GetChildOffset(nsIDOMNode *aChild, nsIDOMNode *aParent, PRInt32 &aOffset)
{
NS_ASSERTION((aChild && aParent), "bad args");
nsresult result = NS_ERROR_NULL_POINTER;
if (aChild && aParent)
{
nsCOMPtr<nsIDOMNodeList> childNodes;
result = aParent->GetChildNodes(getter_AddRefs(childNodes));
if ((NS_SUCCEEDED(result)) && (childNodes))
{
PRInt32 i=0;
for ( ; NS_SUCCEEDED(result); i++)
{
nsCOMPtr<nsIDOMNode> childNode;
result = childNodes->Item(i, getter_AddRefs(childNode));
if ((NS_SUCCEEDED(result)) && (childNode))
{
if (childNode.get()==aChild)
{
aOffset = i;
break;
}
}
else if (!childNode)
result = NS_ERROR_NULL_POINTER;
}
}
else if (!childNodes)
result = NS_ERROR_NULL_POINTER;
}
return result;
}
//END nsEditor Private methods
/* ----- TEST METHODS ----- */
// Methods defined here are TEMPORARY
nsresult
GetColIndexForCell(nsIPresShell *aPresShell, nsIDOMNode *aCellNode, PRInt32 &aCellIndex)
{
aCellIndex=0; // initialize out param
nsresult result = NS_ERROR_FAILURE; // we return an error unless we get the index
if ((nsnull!=aCellNode) && (nsnull!=aPresShell))
{ // get the content interface
nsCOMPtr<nsIContent> nodeAsContent(aCellNode);
if (nodeAsContent)
{ // get the frame from the content interface
nsISupports *layoutObject=nsnull; // frames are not ref counted, so don't use an nsCOMPtr
result = aPresShell->GetLayoutObjectFor(nodeAsContent, &layoutObject);
if ((NS_SUCCEEDED(result)) && (nsnull!=layoutObject))
{ // get the table cell interface from the frame
nsITableCellLayout *cellLayoutObject=nsnull; // again, frames are not ref-counted
result = layoutObject->QueryInterface(nsITableCellLayout::IID(), (void**)(&cellLayoutObject));
if ((NS_SUCCEEDED(result)) && (nsnull!=cellLayoutObject))
{ // get the index
result = cellLayoutObject->GetColIndex(aCellIndex);
}
}
}
}
else {
result = NS_ERROR_NULL_POINTER;
}
return result;
}
/* ----- END TEST METHODS ----- */