gecko/editor/libeditor/text/nsTextEditRulesBidi.cpp

110 lines
4.0 KiB
C++
Raw Normal View History

/* -*- 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
* 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 "nsTextEditRules.h"
#include "nsCOMPtr.h"
#include "nsIDOMNode.h"
#include "nsIContent.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsIFrame.h"
#include "nsISelectionPrivate.h"
#include "nsFrameSelection.h"
// Test for distance between caret and text that will be deleted
nsresult
nsTextEditRules::CheckBidiLevelForDeletion(nsISelection *aSelection,
nsIDOMNode *aSelNode,
PRInt32 aSelOffset,
nsIEditor::EDirection aAction,
bool *aCancel)
{
NS_ENSURE_ARG_POINTER(aCancel);
*aCancel = false;
nsCOMPtr<nsIPresShell> shell = mEditor->GetPresShell();
NS_ENSURE_TRUE(shell, NS_ERROR_NOT_INITIALIZED);
nsPresContext *context = shell->GetPresContext();
NS_ENSURE_TRUE(context, NS_ERROR_NULL_POINTER);
if (!context->BidiEnabled())
return NS_OK;
nsCOMPtr<nsIContent> content = do_QueryInterface(aSelNode);
NS_ENSURE_TRUE(content, NS_ERROR_NULL_POINTER);
PRUint8 levelBefore;
PRUint8 levelAfter;
nsCOMPtr<nsISelectionPrivate> privateSelection(do_QueryInterface(aSelection));
NS_ENSURE_TRUE(privateSelection, NS_ERROR_NULL_POINTER);
nsRefPtr<nsFrameSelection> frameSelection;
privateSelection->GetFrameSelection(getter_AddRefs(frameSelection));
NS_ENSURE_TRUE(frameSelection, NS_ERROR_NULL_POINTER);
nsPrevNextBidiLevels levels = frameSelection->
GetPrevNextBidiLevels(content, aSelOffset, true);
levelBefore = levels.mLevelBefore;
levelAfter = levels.mLevelAfter;
PRUint8 currentCaretLevel = frameSelection->GetCaretBidiLevel();
PRUint8 levelOfDeletion;
levelOfDeletion =
(nsIEditor::eNext==aAction || nsIEditor::eNextWord==aAction) ?
levelAfter : levelBefore;
if (currentCaretLevel == levelOfDeletion)
; // perform the deletion
else
{
if (mDeleteBidiImmediately || levelBefore == levelAfter)
; // perform the deletion
else
*aCancel = true;
// Set the bidi level of the caret to that of the
// character that will be (or would have been) deleted
frameSelection->SetCaretBidiLevel(levelOfDeletion);
}
return NS_OK;
}