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97 lines
3.0 KiB
97 lines
3.0 KiB
// This file is part of Kig, a KDE program for Interactive Geometry...
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// Copyright (C) 2002 Dominique Devriese <devriese@kde.org>
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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// 02110-1301, USA.
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#ifndef FILTER_H
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#define FILTER_H
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#include <tqstring.h>
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#include <vector>
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class KigFilter;
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class ScreenInfo;
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class KigDocument;
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/**
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* This singleton class handles all the input filters.
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*/
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class KigFilters
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{
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public:
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static KigFilters* instance();
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KigFilter* find (const TQString& mime);
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// bool save ( const KigDocument& data, TQTextStream& stream );
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/**
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* saving is always done with the native filter. We don't support
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* output filters..
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*/
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bool save ( const KigDocument& data, const TQString& outfile );
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protected:
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KigFilters();
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static KigFilters* sThis;
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typedef std::vector<KigFilter*> vect;
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vect mFilters;
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};
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// KigFilter::load functions should use this macro to conveniently
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// return a very useful parse error in a filter's load function..
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#define KIG_FILTER_PARSE_ERROR \
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{ \
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TQString locs = i18n( "An error was encountered at " \
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"line %1 in file %2." ) \
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.arg( __LINE__ ).arg( __FILE__ ); \
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parseError( file, locs ); \
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return 0; \
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}
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/**
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* This is the base class for an input filter.
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*
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* All the needed work to add a new input filter to Kig is
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* subclassing this class and implement supportMime() and load().
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*/
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class KigFilter
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{
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protected:
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// shows errors to the user..
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void fileNotFound( const TQString& file ) const;
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void parseError( const TQString& file, const TQString& explanation = TQString() ) const;
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void notSupported( const TQString& file, const TQString& explanation ) const;
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void warning( const TQString& explanation ) const;
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public:
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KigFilter();
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virtual ~KigFilter();
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/**
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* can the filter handle the mimetype \p mime ?
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*/
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virtual bool supportMime ( const TQString& mime );
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/**
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* load file \p fromfile and build a KigDocument from it.. If this
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* function returns 0, that means that an error occurred while
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* loading ( implementations of this function are responsible for
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* showing an error message themselves, using the above error
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* functions ). If this functions returns non-0, the caller owns
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* the returned KigDocument ( that was allocated with "new" ).
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*/
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virtual KigDocument* load ( const TQString& fromfile ) = 0;
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};
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#endif
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