Qwt User's Guide: qwt_text_engine.h Source File

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 // vim: expandtab
00011 
00012 #ifndef QWT_TEXT_ENGINE_H
00013 #define QWT_TEXT_ENGINE_H 1
00014 
00015 #include <qsize.h>
00016 #include "qwt_global.h"
00017 
00018 class QFont;
00019 class QRect;
00020 class QString;
00021 class QPainter;
00022 
00038 class QWT_EXPORT QwtTextEngine
00039 {
00040 public:
00041     virtual ~QwtTextEngine();
00042 
00053     virtual int heightForWidth(const QFont &font, int flags, 
00054         const QString &text, int width) const = 0;
00055 
00065     virtual QSize textSize(const QFont &font, int flags,
00066         const QString &text) const = 0;
00067 
00074     virtual bool mightRender(const QString &text) const = 0;
00075 
00091     virtual void textMargins(const QFont &font, const QString &text,
00092         int &left, int &right, int &top, int &bottom) const = 0;
00093 
00102     virtual void draw(QPainter *painter, const QRect &rect,
00103         int flags, const QString &text) const = 0;
00104 
00105 protected:
00106     QwtTextEngine();
00107 };
00108 
00109 
00116 class QWT_EXPORT QwtPlainTextEngine: public QwtTextEngine
00117 {
00118 public:
00119     QwtPlainTextEngine();
00120     virtual ~QwtPlainTextEngine();
00121 
00122     virtual int heightForWidth(const QFont &font, int flags, 
00123         const QString &text, int width) const;
00124 
00125     virtual QSize textSize(const QFont &font, int flags,
00126         const QString &text) const;
00127 
00128     virtual void draw(QPainter *painter, const QRect &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         int &left, int &right, int &top, int &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 int heightForWidth(const QFont &font, int flags, 
00156         const QString &text, int width) const;
00157 
00158     virtual QSize textSize(const QFont &font, int flags,
00159         const QString &text) const;
00160 
00161     virtual void draw(QPainter *painter, const QRect &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         int &left, int &right, int &top, int &bottom) const;
00168 private:
00169     QString taggedText(const QString &, int flags) const;
00170 };
00171 
00172 #endif // !QT_NO_RICHTEXT
00173 
00174 #endif