gecko-dev/editor/base/DeleteRangeTxn.cpp

367 lines
10 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 "DeleteRangeTxn.h"
#include "nsIDOMRange.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMSelection.h"
#include "DeleteTextTxn.h"
#include "DeleteElementTxn.h"
#include "TransactionFactory.h"
#include "nsIContentIterator.h"
#include "nsIContent.h"
#include "nsLayoutCID.h"
#ifdef NS_DEBUG
#include "nsIDOMElement.h"
#endif
static NS_DEFINE_IID(kDeleteTextTxnIID, DELETE_TEXT_TXN_IID);
static NS_DEFINE_IID(kDeleteElementTxnIID, DELETE_ELEMENT_TXN_IID);
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
// note that aEditor is not refcounted
DeleteRangeTxn::DeleteRangeTxn()
: EditAggregateTxn()
{
}
NS_IMETHODIMP DeleteRangeTxn::Init(nsIEditor *aEditor, nsIDOMRange *aRange)
{
if (aEditor && aRange)
{
mEditor = aEditor;
mRange = do_QueryInterface(aRange);
nsresult result = aRange->GetStartParent(getter_AddRefs(mStartParent));
NS_ASSERTION((NS_SUCCEEDED(result)), "GetStartParent failed.");
result = aRange->GetEndParent(getter_AddRefs(mEndParent));
NS_ASSERTION((NS_SUCCEEDED(result)), "GetEndParent failed.");
result = aRange->GetStartOffset(&mStartOffset);
NS_ASSERTION((NS_SUCCEEDED(result)), "GetStartOffset failed.");
result = aRange->GetEndOffset(&mEndOffset);
NS_ASSERTION((NS_SUCCEEDED(result)), "GetEndOffset failed.");
result = aRange->GetCommonParent(getter_AddRefs(mCommonParent));
NS_ASSERTION((NS_SUCCEEDED(result)), "GetCommonParent failed.");
#ifdef NS_DEBUG
{
PRUint32 count;
nsCOMPtr<nsIDOMCharacterData> textNode;
textNode = do_QueryInterface(mStartParent);
if (textNode)
textNode->GetLength(&count);
else
{
nsCOMPtr<nsIDOMNodeList> children;
result = mStartParent->GetChildNodes(getter_AddRefs(children));
NS_ASSERTION(((NS_SUCCEEDED(result)) && children), "bad start child list");
children->GetLength(&count);
}
NS_ASSERTION(mStartOffset<=(PRInt32)count, "bad start offset");
textNode = do_QueryInterface(mEndParent);
if (textNode)
textNode->GetLength(&count);
else
{
nsCOMPtr<nsIDOMNodeList> children;
result = mEndParent->GetChildNodes(getter_AddRefs(children));
NS_ASSERTION(((NS_SUCCEEDED(result)) && children), "bad end child list");
children->GetLength(&count);
}
NS_ASSERTION(mEndOffset<=(PRInt32)count, "bad end offset");
if (gNoisy)
{
printf ("DeleteRange: %d of %p to %d of %p\n",
mStartOffset, (void *)mStartParent, mEndOffset, (void *)mEndParent);
}
}
#endif
return result;
}
else
return NS_ERROR_NULL_POINTER;
}
DeleteRangeTxn::~DeleteRangeTxn()
{
}
NS_IMETHODIMP DeleteRangeTxn::Do(void)
{
if (gNoisy) { printf("Do Delete Range\n"); }
if (!mStartParent || !mEndParent || !mCommonParent)
return NS_ERROR_NULL_POINTER;
nsresult result;
// build the child transactions
if (mStartParent==mEndParent)
{ // the selection begins and ends in the same node
result = CreateTxnsToDeleteBetween(mStartParent, mStartOffset, mEndOffset);
}
else
{ // the selection ends in a different node from where it started
// delete the relevant content in the start node
result = CreateTxnsToDeleteContent(mStartParent, mStartOffset, nsIEditor::eDeleteRight);
if (NS_SUCCEEDED(result))
{
// delete the intervening nodes
result = CreateTxnsToDeleteNodesBetween();
if (NS_SUCCEEDED(result))
{
// delete the relevant content in the end node
result = CreateTxnsToDeleteContent(mEndParent, mEndOffset, nsIEditor::eDeleteLeft);
}
}
}
// if we've successfully built this aggregate transaction, then do it.
if (NS_SUCCEEDED(result)) {
result = EditAggregateTxn::Do();
}
if (NS_SUCCEEDED(result)) {
// set the resulting selection
nsCOMPtr<nsIDOMSelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result)) {
result = selection->Collapse(mStartParent, mStartOffset);
}
}
return result;
}
NS_IMETHODIMP DeleteRangeTxn::Undo(void)
{
if (gNoisy) { printf("Undo Delete Range\n"); }
if (!mStartParent || !mEndParent || !mCommonParent)
return NS_ERROR_NULL_POINTER;
nsresult result = EditAggregateTxn::Undo();
if (NS_SUCCEEDED(result)) {
// set the resulting selection
nsCOMPtr<nsIDOMSelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result)) {
selection->Collapse(mStartParent, mStartOffset);
selection->Extend(mEndParent, mEndOffset);
}
}
return result;
}
NS_IMETHODIMP DeleteRangeTxn::Redo(void)
{
if (gNoisy) { printf("Redo Delete Range\n"); }
if (!mStartParent || !mEndParent || !mCommonParent)
return NS_ERROR_NULL_POINTER;
nsresult result = EditAggregateTxn::Redo();
if (NS_SUCCEEDED(result)) {
// set the resulting selection
nsCOMPtr<nsIDOMSelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(result)) {
result = selection->Collapse(mStartParent, mStartOffset);
}
}
return result;
}
NS_IMETHODIMP DeleteRangeTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP DeleteRangeTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP DeleteRangeTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Insert Range: ";
}
return NS_OK;
}
NS_IMETHODIMP DeleteRangeTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Remove Range: ";
}
return NS_OK;
}
NS_IMETHODIMP DeleteRangeTxn::CreateTxnsToDeleteBetween(nsIDOMNode *aStartParent,
PRUint32 aStartOffset,
PRUint32 aEndOffset)
{
nsresult result;
// see what kind of node we have
nsCOMPtr<nsIDOMCharacterData> textNode;
textNode = do_QueryInterface(aStartParent);
if (textNode)
{ // if the node is a text node, then delete text content
DeleteTextTxn *txn;
result = TransactionFactory::GetNewTransaction(kDeleteTextTxnIID, (EditTxn **)&txn);
if (nsnull!=txn)
{
PRInt32 numToDel;
if (aStartOffset==aEndOffset)
numToDel = 1;
else
numToDel = aEndOffset-aStartOffset;
txn->Init(mEditor, textNode, aStartOffset, numToDel);
AppendChild(txn);
}
}
else
{
PRUint32 childCount;
nsCOMPtr<nsIDOMNodeList> children;
result = aStartParent->GetChildNodes(getter_AddRefs(children));
if ((NS_SUCCEEDED(result)) && children)
{
children->GetLength(&childCount);
NS_ASSERTION(aEndOffset<=childCount, "bad aEndOffset");
PRUint32 i;
for (i=aStartOffset; i<=aEndOffset; i++)
{
nsCOMPtr<nsIDOMNode> child;
result = children->Item(i, getter_AddRefs(child));
if ((NS_SUCCEEDED(result)) && child)
{
DeleteElementTxn *txn;
result = TransactionFactory::GetNewTransaction(kDeleteElementTxnIID, (EditTxn **)&txn);
if (nsnull!=txn)
{
txn->Init(child);
AppendChild(txn);
}
else
return NS_ERROR_NULL_POINTER;
}
}
}
}
return result;
}
NS_IMETHODIMP DeleteRangeTxn::CreateTxnsToDeleteContent(nsIDOMNode *aParent,
PRUint32 aOffset,
nsIEditor::ECollapsedSelectionAction aAction)
{
nsresult result;
// see what kind of node we have
nsCOMPtr<nsIDOMCharacterData> textNode;
textNode = do_QueryInterface(aParent);
if (textNode)
{ // if the node is a text node, then delete text content
PRUint32 start, numToDelete;
if (nsIEditor::eDeleteRight == aAction)
{
start=aOffset;
textNode->GetLength(&numToDelete);
numToDelete -= aOffset;
}
else
{
start=0;
numToDelete=aOffset;
}
if (numToDelete)
{
DeleteTextTxn *txn;
result = TransactionFactory::GetNewTransaction(kDeleteTextTxnIID, (EditTxn **)&txn);
if (nsnull!=txn)
{
txn->Init(mEditor, textNode, start, numToDelete);
AppendChild(txn);
}
else
return NS_ERROR_NULL_POINTER;
}
}
return result;
}
static NS_DEFINE_IID(kSubtreeIteratorCID, NS_SUBTREEITERATOR_CID);
static NS_DEFINE_IID(kRangeCID, NS_RANGE_CID);
NS_IMETHODIMP DeleteRangeTxn::CreateTxnsToDeleteNodesBetween()
{
nsresult result;
nsCOMPtr<nsIContentIterator> iter;
result = nsComponentManager::CreateInstance(kSubtreeIteratorCID,
nsnull,
nsIContentIterator::GetIID(),
getter_AddRefs(iter));
if (!NS_SUCCEEDED(result))
return result;
result = iter->Init(mRange);
if (!NS_SUCCEEDED(result))
return result;
while (NS_COMFALSE == iter->IsDone())
{
nsCOMPtr<nsIDOMNode> node;
nsCOMPtr<nsIContent> content;
result = iter->CurrentNode(getter_AddRefs(content));
node = do_QueryInterface(content);
if ((NS_SUCCEEDED(result)) && node)
{
DeleteElementTxn *txn;
result = TransactionFactory::GetNewTransaction(kDeleteElementTxnIID, (EditTxn **)&txn);
if (nsnull!=txn)
{
txn->Init(node);
AppendChild(txn);
}
else
return NS_ERROR_NULL_POINTER;
}
iter->Next();
}
return result;
}