QwtTextEngine(3)               Qwt User's Guide               QwtTextEngine(3)

NAME
       QwtTextEngine - Abstract base class for rendering text strings.


SYNOPSIS
       #include <qwt_text_engine.h>

       Inherited by QwtPlainTextEngine, and QwtRichTextEngine.

   Public Member Functions
       virtual ~QwtTextEngine ()
           Destructor.
       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 Member Functions
       QwtTextEngine ()
           Constructor.

Detailed Description
       Abstract base class for rendering text strings.

       A text engine is responsible for rendering texts for a specific text
       format. They are used by QwtText to render a text.

       See also
           QwtText::setTextEngine()

       Definition at line 30 of file qwt_text_engine.h.

Member Function Documentation
   virtual void QwtTextEngine::draw (QPainter * painter, const QRectF & rect,
       int flags, const QString & text) const [pure virtual]
       Draw the text in a clipping rectangle

       Parameters
           painter Painter
           rect Clipping rectangle
           flags Bitwise OR of the flags like in for QPainter::drawText()
           text Text to be rendered

       Implemented in QwtRichTextEngine, and QwtPlainTextEngine.

   virtual double QwtTextEngine::heightForWidth (const QFont & font, int
       flags, const QString & text, double width) const [pure virtual]
       Find the height for a given width

       Parameters
           font Font of the text
           flags Bitwise OR of the flags used like in QPainter::drawText
           text Text to be rendered
           width Width

       Returns
           Calculated height

       Implemented in QwtRichTextEngine, and QwtPlainTextEngine.

   virtual bool QwtTextEngine::mightRender (const QString & text) const [pure
       virtual]
       Test if a string can be rendered by this text engine

       Parameters
           text Text to be tested

       Returns
           true, if it can be rendered

       Implemented in QwtRichTextEngine, and QwtPlainTextEngine.

   virtual void QwtTextEngine::textMargins (const QFont & font, const QString
       & text, double & left, double & right, double & top, double & bottom)
       const [pure virtual]
       Return margins around the texts

       The textSize might include margins around the text, like
       QFontMetrics::descent(). In situations where texts need to be aligned
       in detail, knowing these margins might improve the layout calculations.

       Parameters
           font Font of the text
           text Text to be rendered
           left Return value for the left margin
           right Return value for the right margin
           top Return value for the top margin
           bottom Return value for the bottom margin

       Implemented in QwtRichTextEngine, and QwtPlainTextEngine.

   virtual QSizeF QwtTextEngine::textSize (const QFont & font, int flags,
       const QString & text) const [pure virtual]
       Returns the size, that is needed to render text

       Parameters
           font Font of the text
           flags Bitwise OR of the flags like in for QPainter::drawText
           text Text to be rendered

       Returns
           Calculated size

       Implemented in QwtRichTextEngine, and QwtPlainTextEngine.


Author
       Generated automatically by Doxygen for Qwt User's Guide from the source
       code.

Version 6.2.0                   Sun Jul 18 2021               QwtTextEngine(3)