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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef _SW_PORTIONHANDLER_HXX
#define _SW_PORTIONHANDLER_HXX
#include <tools/solar.h>
class String;
/** The SwPortionHandler interface implements a visitor for the layout
* engine's text portions. This can be used to gather information of
* the on-screen representation of a single paragraph.
*
* For each text portion, one of the methods text(...) or special(...)
* is called, depending on whether it is a 'normal' run of text, or
* any other portion. Additionally, the linebreak() method is called
* once at the end of every on-screen line.
*
* All parameters relate to the 'model string', which is the text string
* held by the corresponding SwTxtNode.
*
* The SwPortionHandler can be used with the
* SwTextFrame::VisitPortions(...) method.
*/
class SwPortionHandler
{
public:
SwPortionHandler() {} /// (emtpy) constructor
virtual ~SwPortionHandler() {} /// (empty) destructor
/** text portion. A run of nLength characters from the model
* string, that contains no special characters like embedded
* fields, etc. Thus, the on-screen text of this portion
* corresponds exactly to the corresponding characters in the
* model string.
*/
virtual void Text(
USHORT nLength, /// length of this portion in the model string
USHORT nType /// type of this portion
) = 0;
/** special portion. This method is called for every non-text
* portion. The parameters describe the length of the
* corresponding characters in the model string (often 0 or 1),
* the text which is displayed, and the type of the portion.
*/
virtual void Special(
USHORT nLength, /// length of this portion in the model string
const String& rText, /// text which is painted on-screen
USHORT nType /// type of this portion
) = 0;
/** line break. This method is called whenever a line break in the
* layout occurs.
*/
virtual void LineBreak() = 0;
/** skip characters. The SwTxtFrame may only display partially
* display a certain paragraph (e.g. when the paragaph is split
* across multiple pages). In this case, the Skip() method must be
* called to inform the portion handler to ignore a certain run of
* characters in the 'model string'. Skip(), if used at all, must
* be called before any of the other methods is called. Calling
* Skip() between portions is not allowed.
*/
virtual void Skip(
USHORT nLength /// number of 'model string' characters to be skipped
) = 0;
/** end of paragraph. This method is to be called when all the
* paragraph's portions have been processed.
*/
virtual void Finish() = 0;
};
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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