qwt_text_engine.h

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/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   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_ENGINE_H
#define QWT_TEXT_ENGINE_H
 
#include "qwt_global.h"
#include <qsize.h>
 
class QFont;
class QRectF;
class QString;
class QPainter;
 
class QWT_EXPORT QwtTextEngine
{
  public:
    virtual ~QwtTextEngine();
 
    virtual double heightForWidth( const QFont& font, int flags,
        const QString& text, double width ) const = 0;
 
    virtual QSizeF textSize( const QFont& font, int flags,
        const QString& text ) const = 0;
 
    virtual bool mightRender( const QString& text ) const = 0;
 
    virtual void textMargins( const QFont& font, const QString& text,
        double& left, double& right, double& top, double& bottom ) const = 0;
 
    virtual void draw( QPainter* painter, const QRectF& rect,
        int flags, const QString& text ) const = 0;
 
  protected:
    QwtTextEngine();
 
  private:
    Q_DISABLE_COPY(QwtTextEngine)
};
 
 
class QWT_EXPORT QwtPlainTextEngine : public QwtTextEngine
{
  public:
    QwtPlainTextEngine();
    virtual ~QwtPlainTextEngine();
 
    virtual double heightForWidth( const QFont& font, int flags,
        const QString& text, double width ) const QWT_OVERRIDE;
 
    virtual QSizeF textSize( const QFont& font, int flags,
        const QString& text ) const QWT_OVERRIDE;
 
    virtual void draw( QPainter*, const QRectF& rect,
        int flags, const QString& text ) const QWT_OVERRIDE;
 
    virtual bool mightRender( const QString& ) const QWT_OVERRIDE;
 
    virtual void textMargins(
        const QFont&, const QString&,
        double& left, double& right,
        double& top, double& bottom ) const QWT_OVERRIDE;
 
  private:
    class PrivateData;
    PrivateData* m_data;
};
 
 
#ifndef QT_NO_RICHTEXT
 
class QWT_EXPORT QwtRichTextEngine : public QwtTextEngine
{
  public:
    QwtRichTextEngine();
 
    virtual double heightForWidth( const QFont& font, int flags,
        const QString& text, double width ) const QWT_OVERRIDE;
 
    virtual QSizeF textSize( const QFont& font, int flags,
        const QString& text ) const QWT_OVERRIDE;
 
    virtual void draw( QPainter*, const QRectF& rect,
        int flags, const QString& text ) const QWT_OVERRIDE;
 
    virtual bool mightRender( const QString& ) const QWT_OVERRIDE;
 
    virtual void textMargins(
        const QFont&, const QString&,
        double& left, double& right,
        double& top, double& bottom ) const QWT_OVERRIDE;
 
  private:
    QString taggedText( const QString&, int flags ) const;
};
 
#endif // !QT_NO_RICHTEXT
 
#endif