RetroZilla/editor/libeditor/base/DeleteRangeTxn.cpp

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2015-10-21 05:03:22 +02:00
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Pierre Phaneuf <pp@ludusdesign.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "DeleteRangeTxn.h"
#include "nsIDOMRange.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMNodeList.h"
#include "nsISelection.h"
#include "DeleteTextTxn.h"
#include "DeleteElementTxn.h"
#include "TransactionFactory.h"
#include "nsIContentIterator.h"
#include "nsIContent.h"
#include "nsComponentManagerUtils.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
// note that aEditor is not refcounted
DeleteRangeTxn::DeleteRangeTxn()
: EditAggregateTxn()
,mRange()
,mStartParent()
,mStartOffset(0)
,mEndParent()
,mCommonParent()
,mEndOffset(0)
,mEditor(nsnull)
,mRangeUpdater(nsnull)
{
}
NS_IMETHODIMP DeleteRangeTxn::Init(nsIEditor *aEditor,
nsIDOMRange *aRange,
nsRangeUpdater *aRangeUpdater)
{
NS_ASSERTION(aEditor && aRange, "bad state");
if (!aEditor || !aRange) { return NS_ERROR_NOT_INITIALIZED; }
mEditor = aEditor;
mRange = do_QueryInterface(aRange);
mRangeUpdater = aRangeUpdater;
nsresult result = aRange->GetStartContainer(getter_AddRefs(mStartParent));
NS_ASSERTION((NS_SUCCEEDED(result)), "GetStartParent failed.");
result = aRange->GetEndContainer(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->GetCommonAncestorContainer(getter_AddRefs(mCommonParent));
NS_ASSERTION((NS_SUCCEEDED(result)), "GetCommonParent failed.");
#ifdef NS_DEBUG
{
PRUint32 count;
nsCOMPtr<nsIDOMCharacterData> 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");
#ifdef NS_DEBUG
if (gNoisy)
{
printf ("DeleteRange: %d of %p to %d of %p\n",
mStartOffset, (void *)mStartParent, mEndOffset, (void *)mEndParent);
}
#endif
}
#endif
return result;
}
DeleteRangeTxn::~DeleteRangeTxn()
{
}
NS_IMETHODIMP DeleteRangeTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Do Delete Range\n"); }
#endif
if (!mStartParent || !mEndParent || !mCommonParent || !mEditor)
return NS_ERROR_NOT_INITIALIZED;
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::eNext);
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::ePrevious);
}
}
}
// if we've successfully built this aggregate transaction, then do it.
if (NS_SUCCEEDED(result)) {
result = EditAggregateTxn::DoTransaction();
}
if (NS_FAILED(result)) return result;
// only set selection to deletion point if editor gives permission
PRBool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection)
{
nsCOMPtr<nsISelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_FAILED(result)) return result;
if (!selection) return NS_ERROR_NULL_POINTER;
result = selection->Collapse(mStartParent, mStartOffset);
}
else
{
// do nothing - dom range gravity will adjust selection
}
return result;
}
NS_IMETHODIMP DeleteRangeTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Undo Delete Range\n"); }
#endif
if (!mStartParent || !mEndParent || !mCommonParent || !mEditor)
return NS_ERROR_NOT_INITIALIZED;
return EditAggregateTxn::UndoTransaction();
}
NS_IMETHODIMP DeleteRangeTxn::RedoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Redo Delete Range\n"); }
#endif
if (!mStartParent || !mEndParent || !mCommonParent || !mEditor)
return NS_ERROR_NOT_INITIALIZED;
return EditAggregateTxn::RedoTransaction();
}
NS_IMETHODIMP DeleteRangeTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
if (aDidMerge)
*aDidMerge = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP DeleteRangeTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("DeleteRangeTxn");
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 = do_QueryInterface(aStartParent);
if (textNode)
{ // if the node is a text node, then delete text content
DeleteTextTxn *txn;
result = TransactionFactory::GetNewTransaction(DeleteTextTxn::GetCID(), (EditTxn **)&txn);
if (NS_FAILED(result)) return result;
if (!txn) return NS_ERROR_NULL_POINTER;
PRInt32 numToDel;
if (aStartOffset==aEndOffset)
numToDel = 1;
else
numToDel = aEndOffset-aStartOffset;
txn->Init(mEditor, textNode, aStartOffset, numToDel, mRangeUpdater);
AppendChild(txn);
NS_RELEASE(txn);
}
else
{
nsCOMPtr<nsIDOMNodeList> children;
result = aStartParent->GetChildNodes(getter_AddRefs(children));
if (NS_FAILED(result)) return result;
if (!children) return NS_ERROR_NULL_POINTER;
#ifdef DEBUG
PRUint32 childCount;
children->GetLength(&childCount);
NS_ASSERTION(aEndOffset<=childCount, "bad aEndOffset");
#endif
PRUint32 i;
for (i=aStartOffset; i<aEndOffset; i++)
{
nsCOMPtr<nsIDOMNode> child;
result = children->Item(i, getter_AddRefs(child));
if (NS_FAILED(result)) return result;
if (!child) return NS_ERROR_NULL_POINTER;
DeleteElementTxn *txn;
result = TransactionFactory::GetNewTransaction(DeleteElementTxn::GetCID(), (EditTxn **)&txn);
if (NS_FAILED(result)) return result;
if (!txn) return NS_ERROR_NULL_POINTER;
txn->Init(child, mRangeUpdater);
AppendChild(txn);
NS_RELEASE(txn);
}
}
return result;
}
NS_IMETHODIMP DeleteRangeTxn::CreateTxnsToDeleteContent(nsIDOMNode *aParent,
PRUint32 aOffset,
nsIEditor::EDirection aAction)
{
nsresult result = NS_OK;
// see what kind of node we have
nsCOMPtr<nsIDOMCharacterData> textNode = do_QueryInterface(aParent);
if (textNode)
{ // if the node is a text node, then delete text content
PRUint32 start, numToDelete;
if (nsIEditor::eNext == aAction)
{
start=aOffset;
textNode->GetLength(&numToDelete);
numToDelete -= aOffset;
}
else
{
start=0;
numToDelete=aOffset;
}
if (numToDelete)
{
DeleteTextTxn *txn;
result = TransactionFactory::GetNewTransaction(DeleteTextTxn::GetCID(), (EditTxn **)&txn);
if (NS_FAILED(result)) return result;
if (!txn) return NS_ERROR_NULL_POINTER;
txn->Init(mEditor, textNode, start, numToDelete, mRangeUpdater);
AppendChild(txn);
NS_RELEASE(txn);
}
}
return result;
}
NS_IMETHODIMP DeleteRangeTxn::CreateTxnsToDeleteNodesBetween()
{
nsCOMPtr<nsIContentIterator> iter = do_CreateInstance("@mozilla.org/content/subtree-content-iterator;1");
if (!iter) return NS_ERROR_NULL_POINTER;
nsresult result = iter->Init(mRange);
if (NS_FAILED(result)) return result;
while (!iter->IsDone())
{
nsCOMPtr<nsIDOMNode> node = do_QueryInterface(iter->GetCurrentNode());
if (!node)
return NS_ERROR_NULL_POINTER;
DeleteElementTxn *txn;
result = TransactionFactory::GetNewTransaction(DeleteElementTxn::GetCID(), (EditTxn **)&txn);
if (NS_FAILED(result)) return result;
if (!txn) return NS_ERROR_NULL_POINTER;
txn->Init(node, mRangeUpdater);
AppendChild(txn);
NS_RELEASE(txn);
iter->Next();
}
return result;
}