gecko/editor/libeditor/text/nsTextEditRulesBidi.cpp

116 lines
4.0 KiB
C++

/* -*- 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
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*
* 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
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* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
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* 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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#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,
PRBool *aCancel)
{
NS_ENSURE_ARG_POINTER(aCancel);
*aCancel = PR_FALSE;
nsCOMPtr<nsIPresShell> shell;
nsresult res = mEditor->GetPresShell(getter_AddRefs(shell));
if (NS_FAILED(res))
return res;
if (!shell)
return NS_ERROR_NULL_POINTER;
nsPresContext *context = shell->GetPresContext();
if (!context)
return NS_ERROR_NULL_POINTER;
if (!context->BidiEnabled())
return NS_OK;
nsCOMPtr<nsIContent> content = do_QueryInterface(aSelNode);
if (!content)
return NS_ERROR_NULL_POINTER;
PRUint8 levelBefore;
PRUint8 levelAfter;
nsCOMPtr<nsISelectionPrivate> privateSelection(do_QueryInterface(aSelection));
if (!privateSelection)
return NS_ERROR_NULL_POINTER;
nsCOMPtr<nsFrameSelection> frameSelection;
privateSelection->GetFrameSelection(getter_AddRefs(frameSelection));
if (!frameSelection)
return NS_ERROR_NULL_POINTER;
nsPrevNextBidiLevels levels = frameSelection->
GetPrevNextBidiLevels(content, aSelOffset, PR_TRUE);
levelBefore = levels.mLevelBefore;
levelAfter = levels.mLevelAfter;
PRUint8 currentCaretLevel = frameSelection->GetCaretBidiLevel();
PRUint8 levelOfDeletion;
levelOfDeletion = (nsIEditor::eNext==aAction) ? levelAfter : levelBefore;
if (currentCaretLevel == levelOfDeletion)
; // perform the deletion
else
{
if (mDeleteBidiImmediately || levelBefore == levelAfter)
; // perform the deletion
else
*aCancel = PR_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;
}