gecko-dev/editor/libeditor/text/nsTextEditRulesBidi.cpp

166 строки
5.4 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
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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
* 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 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 "nsIPresContext.h"
#include "nsIFrame.h"
// Test for distance between caret and text that will be deleted
nsresult
nsTextEditRules::CheckBidiLevelForDeletion(nsIDOMNode *aSelNode,
PRInt32 aSelOffset,
nsIEditor::EDirection aAction,
PRBool *aCancel)
{
NS_ENSURE_ARG_POINTER(aCancel);
*aCancel = PR_FALSE;
nsresult res = NS_OK;
nsCOMPtr<nsIPresShell> shell;
res = mEditor->GetPresShell(getter_AddRefs(shell));
if (NS_FAILED(res))
return res;
if (!shell)
return NS_ERROR_NULL_POINTER;
nsCOMPtr<nsIPresContext> context;
res = shell->GetPresContext(getter_AddRefs(context));
if (NS_FAILED(res))
return res;
if (!context)
return NS_ERROR_NULL_POINTER;
PRBool bidiEnabled;
context->GetBidiEnabled(&bidiEnabled);
if (!bidiEnabled)
return NS_OK;
nsCOMPtr<nsIContent> content = do_QueryInterface(aSelNode);
if (!content)
return NS_ERROR_NULL_POINTER;
nsIFrame *primaryFrame;
nsIFrame *frameBefore;
nsIFrame *frameAfter;
PRInt32 frameOffset;
res = shell->GetPrimaryFrameFor(content, &primaryFrame);
if (NS_FAILED(res))
return res;
if (!primaryFrame)
return NS_ERROR_NULL_POINTER;
res = primaryFrame->GetChildFrameContainingOffset(aSelOffset, PR_FALSE, &frameOffset, &frameBefore);
if (NS_FAILED(res))
return res;
if (!frameBefore)
return NS_ERROR_NULL_POINTER;
PRInt32 start, end;
PRUint8 currentCursorLevel;
PRUint8 levelAfter;
PRUint8 levelBefore;
PRUint8 levelOfDeletion;
nsCOMPtr<nsIAtom> embeddingLevel = getter_AddRefs(NS_NewAtom("EmbeddingLevel"));
nsCOMPtr<nsIAtom> baseLevel = getter_AddRefs(NS_NewAtom("BaseLevel"));
// Get the bidi level of the frame before the caret
res = frameBefore->GetBidiProperty(context, embeddingLevel, (void**)&levelBefore,sizeof(PRUint8));
if (NS_FAILED(res))
return res;
// If the caret is at the end of the frame, get the bidi level of the
// frame after the caret
frameBefore->GetOffsets(start, end);
if (aSelOffset == end
|| aSelOffset == -1)
{
res = primaryFrame->GetChildFrameContainingOffset(aSelOffset, PR_TRUE, &frameOffset, &frameAfter);
if (NS_FAILED(res))
return res;
if (!frameAfter)
return NS_ERROR_NULL_POINTER;
if (frameBefore==frameAfter)
{
// there was no frameAfter, i.e. the caret is at the end of the
// document -- use the base paragraph level
res = frameBefore->GetBidiProperty(context, baseLevel, (void**)&levelAfter,sizeof(PRUint8));
if (NS_FAILED(res))
return res;
}
else
{
res = frameAfter->GetBidiProperty(context, embeddingLevel, (void**)&levelAfter,sizeof(PRUint8));
if (NS_FAILED(res))
return res;
}
}
else
{
levelAfter = levelBefore;
}
res = shell->GetCaretBidiLevel(&currentCursorLevel);
if (NS_FAILED(res))
return res;
levelOfDeletion = (nsIEditor::eNext==aAction) ? levelAfter : levelBefore;
if (currentCursorLevel == levelOfDeletion)
; // perform the deletion
else
{
if ((levelBefore==levelAfter)
&& (levelBefore & 1) == (currentCursorLevel & 1))
; // 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
res = shell->SetCaretBidiLevel(levelOfDeletion);
if (NS_FAILED(res))
return res;
}
return NS_OK;
}