pjs/editor/libeditor/base/DeleteTextTxn.cpp

122 строки
3.5 KiB
C++
Исходник Обычный вид История

/* -*- 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 "DeleteTextTxn.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMSelection.h"
DeleteTextTxn::DeleteTextTxn()
: EditTxn()
{
}
DeleteTextTxn::~DeleteTextTxn()
{
}
NS_IMETHODIMP DeleteTextTxn::Init(nsIEditor *aEditor,
nsIDOMCharacterData *aElement,
PRUint32 aOffset,
PRUint32 aNumCharsToDelete)
{
NS_ASSERTION(aEditor&&aElement, "bad arg");
mEditor = do_QueryInterface(aEditor);
mElement = do_QueryInterface(aElement);
mOffset = aOffset;
mNumCharsToDelete = aNumCharsToDelete;
NS_ASSERTION(0!=aNumCharsToDelete, "bad arg, numCharsToDelete");
mDeletedText = "";
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::Do(void)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (mEditor && mElement)
{
// get the text that we're about to delete
result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
result = mElement->DeleteData(mOffset, mNumCharsToDelete);
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMSelection> selection;
nsresult selectionResult = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(selectionResult) && selection) {
selectionResult = selection->Collapse(mElement, mOffset);
NS_ASSERTION((NS_SUCCEEDED(selectionResult)), "selection could not be collapsed after undo of insert.");
}
}
}
return result;
}
//XXX: we may want to store the selection state and restore it properly
// was it an insertion point or an extended selection?
NS_IMETHODIMP DeleteTextTxn::Undo(void)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (mEditor && mElement)
{
result = mElement->InsertData(mOffset, mDeletedText);
if (NS_SUCCEEDED(result))
{
nsCOMPtr<nsIDOMSelection> selection;
nsresult selectionResult = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_SUCCEEDED(selectionResult) && selection) {
selectionResult = selection->Collapse(mElement, mOffset);
NS_ASSERTION((NS_SUCCEEDED(selectionResult)), "selection could not be collapsed after undo of insert.");
}
}
}
return result;
}
NS_IMETHODIMP DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::GetUndoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Insert Text: ";
**aString += mDeletedText;
}
return NS_OK;
}
NS_IMETHODIMP DeleteTextTxn::GetRedoString(nsString **aString)
{
if (nsnull!=aString)
{
**aString="Remove Text: ";
**aString += mDeletedText;
}
return NS_OK;
}