qwt_text.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2003   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_TEXT_H
#define QWT_TEXT_H

#include "qwt_global.h"
#include <qstring.h>
#include <qsize.h>
#include <qfont.h>

class QColor;
class QPen;
class QBrush;
class QRectF;
class QPainter;
class QwtTextEngine;

class QWT_EXPORT QwtText
{
public:

    enum TextFormat
    {
        AutoText = 0,

        PlainText,

        RichText,

        MathMLText,

        TeXText,

        OtherFormat = 100
    };

    enum PaintAttribute
    {
        PaintUsingTextFont = 0x01,

        PaintUsingTextColor = 0x02,

        PaintBackground = 0x04
    };

    typedef QFlags<PaintAttribute> PaintAttributes;

    enum LayoutAttribute
    {
        MinimumLayout = 0x01
    };

    typedef QFlags<LayoutAttribute> LayoutAttributes;

    QwtText( const QString & = QString::null,
             TextFormat textFormat = AutoText );
    QwtText( const QwtText & );
    ~QwtText();

    QwtText &operator=( const QwtText & );

    bool operator==( const QwtText & ) const;
    bool operator!=( const QwtText & ) const;

    void setText( const QString &,
        QwtText::TextFormat textFormat = AutoText );
    QString text() const;

    bool isNull() const;
    bool isEmpty() const;

    void setFont( const QFont & );
    QFont font() const;

    QFont usedFont( const QFont & ) const;

    void setRenderFlags( int flags );
    int renderFlags() const;

    void setColor( const QColor & );
    QColor color() const;

    QColor usedColor( const QColor & ) const;

    void setBackgroundPen( const QPen & );
    QPen backgroundPen() const;

    void setBackgroundBrush( const QBrush & );
    QBrush backgroundBrush() const;

    void setPaintAttribute( PaintAttribute, bool on = true );
    bool testPaintAttribute( PaintAttribute ) const;

    void setLayoutAttribute( LayoutAttribute, bool on = true );
    bool testLayoutAttribute( LayoutAttribute ) const;

    double heightForWidth( double width, const QFont & = QFont() ) const;
    QSizeF textSize( const QFont & = QFont() ) const;

    void draw( QPainter *painter, const QRectF &rect ) const;

    static const QwtTextEngine *textEngine( 
        const QString &text, QwtText::TextFormat = AutoText );

    static const QwtTextEngine *textEngine( QwtText::TextFormat );
    static void setTextEngine( QwtText::TextFormat, QwtTextEngine * );

private:
    class PrivateData;
    PrivateData *d_data;

    class LayoutCache;
    LayoutCache *d_layoutCache;
};

inline bool QwtText::isNull() const
{
    return text().isNull();
}

inline bool QwtText::isEmpty() const
{
    return text().isEmpty();
}

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtText::PaintAttributes )
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtText::LayoutAttributes )

#endif