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

QwtTextEngine -

#include <qwt_text_engine.h>
Inherited by QwtMathMLTextEngine, QwtPlainTextEngine, and QwtRichTextEngine.


virtual ~QwtTextEngine ()
 
virtual void draw (QPainter *painter, const QRect &rect, int flags, const QString &text) const =0
 
virtual int heightForWidth (const QFont &font, int flags, const QString &text, int width) 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 QSize textSize (const QFont &font, int flags, const QString &text) const =0
 


QwtTextEngine ()
 

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()

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, QwtPlainTextEngine, and QwtMathMLTextEngine.

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, QwtPlainTextEngine, and QwtMathMLTextEngine.

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, QwtPlainTextEngine, and QwtMathMLTextEngine.

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 QwtRichTextEngine, QwtPlainTextEngine, and QwtMathMLTextEngine.

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 QwtRichTextEngine, QwtPlainTextEngine, and QwtMathMLTextEngine.

Generated automatically by Doxygen for Qwt User's Guide from the source code.
Tue Nov 20 2012 Version 5.2.3

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