QwtTextEngine Class Reference

Inheritance diagram for QwtTextEngine:

[legend]List of all members.

---

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.

QwtPlainTextEngine and QwtRichTextEngine are part of the Qwt library.

QwtMathMLTextEngine can be found in Qwt MathML extension, that needs the MathML renderer of the Qt solutions package. Unfortunately it is only available with a commercial Qt license.

See also:

QwtText::setTextEngine

Definition at line 38 of file qwt_text_engine.h.

Public Member Functions
virtual	~QwtTextEngine ()
virtual int	heightForWidth (const QFont &font, int flags, const QString &text, int width) const =0
virtual QSize	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, int &left, int &right, int &top, int &bottom) const =0
virtual void	draw (QPainter *painter, const QRect &rect, int flags, const QString &text) const =0
Protected Member Functions
	QwtTextEngine ()

---

Constructor & Destructor Documentation

QwtTextEngine::~QwtTextEngine (   )  [virtual]

Destructor. Definition at line 129 of file qwt_text_engine.cpp.

QwtTextEngine::QwtTextEngine (   )  [protected]

Constructor. Definition at line 124 of file qwt_text_engine.cpp.

---

Member Function Documentation

virtual void QwtTextEngine::draw (  QPainter *  painter, const QRect &  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 QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

virtual int QwtTextEngine::heightForWidth (  const QFont &  font, int  flags, const QString &  text, int  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 QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

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 QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

virtual void QwtTextEngine::textMargins (  const QFont &  font, const QString &  text, int &  left, int &  right, int &  top, int &  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 aligend 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 QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

virtual QSize 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: Caluclated size Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.

---