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Qwt User's Guide
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00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- ***************************** 00002 * Qwt Widget Library 00003 * Copyright (C) 1997 Josef Wilgen 00004 * Copyright (C) 2003 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 00106 00113 class QWT_EXPORT QwtPlainTextEngine: public QwtTextEngine 00114 { 00115 public: 00116 QwtPlainTextEngine(); 00117 virtual ~QwtPlainTextEngine(); 00118 00119 virtual double heightForWidth( const QFont &font, int flags, 00120 const QString &text, double width ) const; 00121 00122 virtual QSizeF textSize( const QFont &font, int flags, 00123 const QString &text ) const; 00124 00125 virtual void draw( QPainter *painter, const QRectF &rect, 00126 int flags, const QString &text ) const; 00127 00128 virtual bool mightRender( const QString & ) const; 00129 00130 virtual void textMargins( const QFont &, const QString &, 00131 double &left, double &right, double &top, double &bottom ) const; 00132 00133 private: 00134 class PrivateData; 00135 PrivateData *d_data; 00136 }; 00137 00138 00139 #ifndef QT_NO_RICHTEXT 00140 00147 class QWT_EXPORT QwtRichTextEngine: public QwtTextEngine 00148 { 00149 public: 00150 QwtRichTextEngine(); 00151 00152 virtual double heightForWidth( const QFont &font, int flags, 00153 const QString &text, double width ) const; 00154 00155 virtual QSizeF textSize( const QFont &font, int flags, 00156 const QString &text ) const; 00157 00158 virtual void draw( QPainter *painter, const QRectF &rect, 00159 int flags, const QString &text ) const; 00160 00161 virtual bool mightRender( const QString & ) const; 00162 00163 virtual void textMargins( const QFont &, const QString &, 00164 double &left, double &right, double &top, double &bottom ) const; 00165 00166 private: 00167 QString taggedText( const QString &, int flags ) const; 00168 }; 00169 00170 #endif // !QT_NO_RICHTEXT 00171 00172 #endif