KoComplexText.h

/****************************************************************************
** $Id: KoComplexText.h 484817 2005-12-02 00:53:59Z dfaure $
**
** Internal header file.
**
** Created :
**
** Copyright (C) 2001 Trolltech AS.  All rights reserved.
**
** This file is part of the kernel module of the TQt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.TQPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid TQt Enterprise Edition or TQt Professional Edition
** licenses may use this file in accordance with the TQt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about TQt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for TQPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
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**********************************************************************/
 
#ifndef TQCOMPLEXTEXT_H
#define TQCOMPLEXTEXT_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the TQt API.  It exists for the convenience
// of TQt Remote Control. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
//
 
#ifndef TQT_H
#include <tqstring.h>
#include <tqpointarray.h>
#include <tqfont.h>
#include <tqpainter.h>
#include <tqptrlist.h>
#include <tqshared.h>
#endif // TQT_H
 
#ifndef TQT_NO_COMPLEXTEXT
 
// bidi helper classes. Internal to TQt
struct TQ_EXPORT KoBidiStatus {
    KoBidiStatus() {
    eor = TQChar::DirON;
    lastStrong = TQChar::DirON;
    last = TQChar:: DirON;
    }
    TQChar::Direction eor;
    TQChar::Direction lastStrong;
    TQChar::Direction last;
};
 
struct TQ_EXPORT KoBidiContext : public TQShared {
    // ### ref and deref parent?
    KoBidiContext( uchar level, TQChar::Direction embedding, KoBidiContext *parent = 0, bool override = false );
    ~KoBidiContext();
 
    unsigned char level;
    bool override : 1;
    TQChar::Direction dir : 5;
 
    KoBidiContext *parent;
};
 
struct TQ_EXPORT KoBidiControl {
    KoBidiControl() { context = 0; }
    KoBidiControl( KoBidiContext *c, KoBidiStatus s)
    { context = c; if( context ) context->ref(); status = s; }
    ~KoBidiControl() { if ( context && context->deref() ) delete context; }
    void setContext( KoBidiContext *c ) { if ( context == c ) return; if ( context && context->deref() ) delete context; context = c; context->ref(); }
    KoBidiContext *context;
    KoBidiStatus status;
};
 
struct TQ_EXPORT KoTextRun {
    KoTextRun(int _start, int _stop, KoBidiContext *context, TQChar::Direction dir);
 
    int start;
    int stop;
    // explicit + implicit levels here
    uchar level;
};
 
class TQ_EXPORT KoComplexText {
public:
    enum Shape {
    XIsolated,
    XFinal,
    XInitial,
    XMedial
    };
    static Shape glyphVariant( const TQString &str, int pos);
    static Shape glyphVariantLogical( const TQString &str, int pos);
 
    static TQString shapedString( const TQString &str, int from = 0, int len = -1, TQPainter::TextDirection dir = TQPainter::Auto, const TQFontMetrics *fm = 0);
    static TQChar shapedCharacter(const TQString &str, int pos, const TQFontMetrics *fm = 0);
 
    // positions non spacing marks relative to the base character at position pos.
    //static TQPointArray positionMarks( TQFontPrivate *f, const TQString &str, int pos, TQRect *boundingRect = 0 );
 
    static TQPtrList<KoTextRun> *bidiReorderLine( KoBidiControl *control, const TQString &str, int start, int len,
                        TQChar::Direction basicDir = TQChar::DirON );
    static TQString bidiReorderString( const TQString &str, TQChar::Direction basicDir = TQChar::DirON );
};
 
#endif //TQT_NO_COMPLEXTEXT
 
#endif