pjs/editor/libeditor/base/InsertTextTxn.cpp

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/* -*- 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
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* 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
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* ***** END LICENSE BLOCK ***** */
#include "InsertTextTxn.h"
#include "nsIDOMCharacterData.h"
#include "nsISelection.h"
#include "EditAggregateTxn.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
InsertTextTxn::InsertTextTxn()
: EditTxn()
{
}
NS_IMETHODIMP InsertTextTxn::Init(nsIDOMCharacterData *aElement,
PRUint32 aOffset,
const nsAString &aStringToInsert,
nsIEditor *aEditor)
{
#if 0
nsAutoString text;
aElement->GetData(text);
printf("InsertTextTxn: Offset to insert at = %d. Text of the node to insert into:\n", aOffset);
wprintf(text.get());
printf("\n");
#endif
NS_ASSERTION(aElement && aEditor, "bad args");
if (!aElement || !aEditor) return NS_ERROR_NULL_POINTER;
mElement = do_QueryInterface(aElement);
mOffset = aOffset;
mStringToInsert = aStringToInsert;
mEditor = aEditor;
return NS_OK;
}
NS_IMETHODIMP InsertTextTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Do Insert Text element = %p\n", mElement.get()); }
#endif
NS_ASSERTION(mElement && mEditor, "bad state");
if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
nsresult result = mElement->InsertData(mOffset, mStringToInsert);
if (NS_FAILED(result)) return result;
// only set selection to insertion 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(mElement, mOffset+mStringToInsert.Length());
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after insert.");
}
else
{
// do nothing - dom range gravity will adjust selection
}
return result;
}
NS_IMETHODIMP InsertTextTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("Undo Insert Text element = %p\n", mElement.get()); }
#endif
NS_ASSERTION(mElement && mEditor, "bad state");
if (!mElement || !mEditor) { return NS_ERROR_NOT_INITIALIZED; }
PRUint32 length = mStringToInsert.Length();
return mElement->DeleteData(mOffset, length);
}
NS_IMETHODIMP InsertTextTxn::Merge(nsITransaction *aTransaction, PRBool *aDidMerge)
{
// set out param default value
if (aDidMerge)
*aDidMerge = PR_FALSE;
nsresult result = NS_OK;
if (aDidMerge && aTransaction)
{
// if aTransaction is a InsertTextTxn, and if the selection hasn't changed,
// then absorb it
InsertTextTxn *otherInsTxn = nsnull;
aTransaction->QueryInterface(InsertTextTxn::GetCID(), (void **)&otherInsTxn);
if (otherInsTxn)
{
if (IsSequentialInsert(otherInsTxn))
{
nsAutoString otherData;
otherInsTxn->GetData(otherData);
mStringToInsert += otherData;
*aDidMerge = PR_TRUE;
#ifdef NS_DEBUG
if (gNoisy) { printf("InsertTextTxn assimilated %p\n", aTransaction); }
#endif
}
NS_RELEASE(otherInsTxn);
}
}
return result;
}
NS_IMETHODIMP InsertTextTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("InsertTextTxn: ");
aString += mStringToInsert;
return NS_OK;
}
/* ============= nsISupports implementation ====================== */
NS_IMETHODIMP
InsertTextTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
if (!aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(InsertTextTxn::GetCID())) {
*aInstancePtr = (void*)(InsertTextTxn*)this;
NS_ADDREF_THIS();
return NS_OK;
}
return (EditTxn::QueryInterface(aIID, aInstancePtr));
}
/* ============ protected methods ================== */
NS_IMETHODIMP InsertTextTxn::GetData(nsString& aResult)
{
aResult = mStringToInsert;
return NS_OK;
}
PRBool InsertTextTxn::IsSequentialInsert(InsertTextTxn *aOtherTxn)
{
NS_ASSERTION(aOtherTxn, "null param");
if (aOtherTxn && aOtherTxn->mElement == mElement)
{
// here, we need to compare offsets.
PRInt32 length = mStringToInsert.Length();
if (aOtherTxn->mOffset == (mOffset + length))
return PR_TRUE;
}
return PR_FALSE;
}