qcomplextext_p.h

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/****************************************************************************
** $Id: qcomplextext_p.h,v 1.1 2002/07/14 21:21:35 leseb Exp $
**
** Internal header file.
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#ifndef QCOMPLEXTEXT_H
#define QCOMPLEXTEXT_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of Qt Remote Control. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
//

#ifndef QT_H
#include "qt3namespace.h"
#include <qstring.h>
#include <qpointarray.h>
#include <qfont.h>
#include <qpainter.h>
#include <qlist.h>
#include <qshared.h>
#endif // QT_H

class QFontPrivate;

namespace Qt3 {

// bidi helper classes. Internal to Qt
struct Q_EXPORT QBidiStatus {
    QBidiStatus() {
        eor = QChar::DirON;
        lastStrong = QChar::DirON;
        last = QChar:: DirON;
    }
    QChar::Direction eor;
    QChar::Direction lastStrong;
    QChar::Direction last;
};

struct Q_EXPORT QBidiContext : public QShared {
    // ### ref and deref parent?
    QBidiContext( uchar level, QChar::Direction embedding, QBidiContext *parent = 0, bool override = FALSE );
    ~QBidiContext();

    unsigned char level;
    bool override : 1;
    QChar::Direction dir : 5;

    QBidiContext *parent;
};

struct Q_EXPORT QBidiControl {
    QBidiControl() { context = 0; }
    QBidiControl( QBidiContext *c, QBidiStatus s)
    { context = c; if( context ) context->ref(); status = s; }
    ~QBidiControl() { if ( context && context->deref() ) delete context; }
    void setContext( QBidiContext *c ) { if ( context == c ) return; if ( context && context->deref() ) delete context; context = c; context->ref(); }
    QBidiContext *context;
    QBidiStatus status;
};

struct Q_EXPORT QTextRun {
    QTextRun(int _start, int _stop, QBidiContext *context, QChar::Direction dir);

    int start;
    int stop;
    // explicit + implicit levels here
    uchar level;
};

class Q_EXPORT QComplexText {
public:
    enum Shape {
        XIsolated,
        XFinal,
        XInitial,
        XMedial
    };
    static Shape glyphVariant( const QString &str, int pos);
    static Shape glyphVariantLogical( const QString &str, int pos);

    static QChar shapedCharacter(const QString &str, int pos, const QFontMetrics *fm = 0);

    // positions non spacing marks relative to the base character at position pos.
    static QPointArray positionMarks( QFontPrivate *f, const QString &str, int pos, QRect *boundingRect = 0 );

    static QPtrList<QTextRun> *bidiReorderLine( QBidiControl *control, const QString &str, int start, int len, 
                                                QChar::Direction basicDir = QChar::DirON );
    static QString bidiReorderString( const QString &str, QChar::Direction basicDir = QChar::DirON );
};

} // namespace Qt3

#endif

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