plotjuggler: qwt_text_engine.h Source File

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00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
00002  * Qwt Widget Library
00003  * Copyright (C) 1997   Josef Wilgen
00004  * Copyright (C) 2002   Uwe Rathmann
00005  *
00006  * This library is free software; you can redistribute it and/or
00007  * modify it under the terms of the Qwt License, Version 1.0
00008  *****************************************************************************/
00009 
00010 #ifndef QWT_TEXT_ENGINE_H
00011 #define QWT_TEXT_ENGINE_H 1
00012 
00013 #include "qwt_global.h"
00014 #include <qsize.h>
00015 
00016 class QFont;
00017 class QRectF;
00018 class QString;
00019 class QPainter;
00020 
00035 class QWT_EXPORT QwtTextEngine
00036 {
00037 public:
00038     virtual ~QwtTextEngine();
00039 
00050     virtual double heightForWidth( const QFont &font, int flags,
00051         const QString &text, double width ) const = 0;
00052 
00062     virtual QSizeF textSize( const QFont &font, int flags,
00063         const QString &text ) const = 0;
00064 
00071     virtual bool mightRender( const QString &text ) const = 0;
00072 
00088     virtual void textMargins( const QFont &font, const QString &text,
00089         double &left, double &right, double &top, double &bottom ) const = 0;
00090 
00099     virtual void draw( QPainter *painter, const QRectF &rect,
00100         int flags, const QString &text ) const = 0;
00101 
00102 protected:
00103     QwtTextEngine();
00104 
00105 private:
00106     Q_DISABLE_COPY(QwtTextEngine)
00107 };
00108 
00109 
00116 class QWT_EXPORT QwtPlainTextEngine: public QwtTextEngine
00117 {
00118 public:
00119     QwtPlainTextEngine();
00120     virtual ~QwtPlainTextEngine();
00121 
00122     virtual double heightForWidth( const QFont &font, int flags,
00123         const QString &text, double width ) const;
00124 
00125     virtual QSizeF textSize( const QFont &font, int flags,
00126         const QString &text ) const;
00127 
00128     virtual void draw( QPainter *painter, const QRectF &rect,
00129         int flags, const QString &text ) const;
00130 
00131     virtual bool mightRender( const QString & ) const;
00132 
00133     virtual void textMargins( const QFont &, const QString &,
00134         double &left, double &right, double &top, double &bottom ) const;
00135 
00136 private:
00137     class PrivateData;
00138     PrivateData *d_data;
00139 };
00140 
00141 
00142 #ifndef QT_NO_RICHTEXT
00143 
00150 class QWT_EXPORT QwtRichTextEngine: public QwtTextEngine
00151 {
00152 public:
00153     QwtRichTextEngine();
00154 
00155     virtual double heightForWidth( const QFont &font, int flags,
00156         const QString &text, double width ) const;
00157 
00158     virtual QSizeF textSize( const QFont &font, int flags,
00159         const QString &text ) const;
00160 
00161     virtual void draw( QPainter *painter, const QRectF &rect,
00162         int flags, const QString &text ) const;
00163 
00164     virtual bool mightRender( const QString & ) const;
00165 
00166     virtual void textMargins( const QFont &, const QString &,
00167         double &left, double &right, double &top, double &bottom ) const;
00168 
00169 private:
00170     QString taggedText( const QString &, int flags ) const;
00171 };
00172 
00173 #endif // !QT_NO_RICHTEXT
00174 
00175 #endif