Referencia de la Clase QwtTextEngine

Abstract base class for rendering text strings. Más...

#include <qwt_text_engine.h>

Diagrama de herencias de QwtTextEngine

Lista de todos los miembros.

Métodos públicos
virtual	~QwtTextEngine ()
	Destructor.
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
Métodos protegidos
	QwtTextEngine ()
	Constructor.

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Descripción detallada

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.

Ver también:

QwtText::setTextEngine

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Documentación del constructor y destructor

QwtTextEngine::~QwtTextEngine

(

)

[virtual]

Destructor.

QwtTextEngine::QwtTextEngine

(

)

[protected]

Constructor.

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Documentación de las funciones miembro

virtual void QwtTextEngine::draw	(	QPainter *	painter,
		const QRect &	rect,
		int	flags,
		const QString &	text
	)		const [pure virtual]

Draw the text in a clipping rectangle

Parámetros:

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

Implementado en QwtPlainTextEngine y QwtRichTextEngine.

virtual int QwtTextEngine::heightForWidth	(	const QFont &	font,
		int	flags,
		const QString &	text,
		int	width
	)		const [pure virtual]

Find the height for a given width

Parámetros:

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

Devuelve:

Calculated height

Implementado en QwtPlainTextEngine y QwtRichTextEngine.

virtual bool QwtTextEngine::mightRender

(

const QString &

text

)

const [pure virtual]

Test if a string can be rendered by this text engine

Parámetros:

text	Text to be tested

Devuelve:

true, if it can be rendered

Implementado en QwtPlainTextEngine y QwtRichTextEngine.

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.

Parámetros:

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

Implementado en QwtPlainTextEngine y QwtRichTextEngine.

virtual QSize QwtTextEngine::textSize	(	const QFont &	font,
		int	flags,
		const QString &	text
	)		const [pure virtual]

Returns the size, that is needed to render text

Parámetros:

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

Devuelve:

Caluclated size

Implementado en QwtPlainTextEngine y QwtRichTextEngine.

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La documentación para esta clase fue generada a partir de los siguientes ficheros:

• src/qwt/src/qwt_text_engine.h
• src/qwt/src/qwt_text_engine.cpp