зеркало из https://github.com/mozilla/gecko-dev.git
122 строки
3.5 KiB
C++
122 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "DeleteTextTxn.h"
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#include "nsIDOMCharacterData.h"
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#include "nsIDOMSelection.h"
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DeleteTextTxn::DeleteTextTxn()
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: EditTxn()
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{
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}
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DeleteTextTxn::~DeleteTextTxn()
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{
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}
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NS_IMETHODIMP DeleteTextTxn::Init(nsIEditor *aEditor,
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nsIDOMCharacterData *aElement,
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PRUint32 aOffset,
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PRUint32 aNumCharsToDelete)
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{
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NS_ASSERTION(aEditor&&aElement, "bad arg");
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mEditor = do_QueryInterface(aEditor);
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mElement = do_QueryInterface(aElement);
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mOffset = aOffset;
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mNumCharsToDelete = aNumCharsToDelete;
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NS_ASSERTION(0!=aNumCharsToDelete, "bad arg, numCharsToDelete");
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mDeletedText = "";
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return NS_OK;
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}
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NS_IMETHODIMP DeleteTextTxn::Do(void)
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{
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nsresult result = NS_ERROR_NULL_POINTER;
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if (mEditor && mElement)
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{
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// get the text that we're about to delete
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result = mElement->SubstringData(mOffset, mNumCharsToDelete, mDeletedText);
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NS_ASSERTION(NS_SUCCEEDED(result), "could not get text to delete.");
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result = mElement->DeleteData(mOffset, mNumCharsToDelete);
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if (NS_SUCCEEDED(result))
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{
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nsCOMPtr<nsIDOMSelection> selection;
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nsresult selectionResult = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_SUCCEEDED(selectionResult) && selection) {
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selectionResult = selection->Collapse(mElement, mOffset);
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NS_ASSERTION((NS_SUCCEEDED(selectionResult)), "selection could not be collapsed after undo of insert.");
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}
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}
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}
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return result;
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}
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//XXX: we may want to store the selection state and restore it properly
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// was it an insertion point or an extended selection?
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NS_IMETHODIMP DeleteTextTxn::Undo(void)
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{
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nsresult result = NS_ERROR_NULL_POINTER;
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if (mEditor && mElement)
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{
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result = mElement->InsertData(mOffset, mDeletedText);
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if (NS_SUCCEEDED(result))
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{
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nsCOMPtr<nsIDOMSelection> selection;
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nsresult selectionResult = mEditor->GetSelection(getter_AddRefs(selection));
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if (NS_SUCCEEDED(selectionResult) && selection) {
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selectionResult = selection->Collapse(mElement, mOffset);
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NS_ASSERTION((NS_SUCCEEDED(selectionResult)), "selection could not be collapsed after undo of insert.");
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}
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}
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}
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return result;
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}
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NS_IMETHODIMP DeleteTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
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{
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if (nsnull!=aDidMerge)
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*aDidMerge=PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP DeleteTextTxn::Write(nsIOutputStream *aOutputStream)
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{
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return NS_OK;
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}
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NS_IMETHODIMP DeleteTextTxn::GetUndoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Insert Text: ";
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**aString += mDeletedText;
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}
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return NS_OK;
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}
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NS_IMETHODIMP DeleteTextTxn::GetRedoString(nsString **aString)
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{
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if (nsnull!=aString)
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{
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**aString="Remove Text: ";
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**aString += mDeletedText;
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}
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return NS_OK;
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}
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