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/**************************************************************
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the 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(
sal_uInt16 nLength, /// length of this portion in the model string
sal_uInt16 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(
sal_uInt16 nLength, /// length of this portion in the model string
const String& rText, /// text which is painted on-screen
sal_uInt16 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(
sal_uInt16 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
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