NAME
QwtTextEngine - Abstract base class for rendering text strings.
SYNOPSIS
#include <qwt_text_engine.h>
Inherited by QwtMathMLTextEngine, QwtPlainTextEngine, and
QwtRichTextEngine.
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 ()
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()
Constructor & Destructor Documentation
QwtTextEngine::~QwtTextEngine () [virtual]
Destructor.
QwtTextEngine::QwtTextEngine () [protected]
Constructor.
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.
Author
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