A class representing a text. More...

#include <qwt_text.h>

Public Types
enum	TextFormat { AutoText = 0, PlainText, RichText, MathMLText, TeXText, OtherFormat = 100 }
	Text format. More...

enum	PaintAttribute { PaintUsingTextFont = 0x01, PaintUsingTextColor = 0x02, PaintBackground = 0x04 }
	Paint Attributes. More...

enum	LayoutAttribute { MinimumLayout = 0x01 }
	Layout Attributes The layout attributes affects some aspects of the layout of the text. More...

typedef QFlags< PaintAttribute >	PaintAttributes
	Paint attributes.

typedef QFlags< LayoutAttribute >	LayoutAttributes
	Layout attributes.

Public Member Functions
	QwtText (const QString &=QString(), TextFormat textFormat=AutoText)

	QwtText (const QwtText &)
	Copy constructor.

	~QwtText ()
	Destructor.

QwtText &	operator= (const QwtText &)
	Assignment operator.

bool	operator== (const QwtText &) const
	Relational operator.

bool	operator!= (const QwtText &) const
	Relational operator.

void	setText (const QString &, QwtText::TextFormat textFormat=AutoText)

QString	text () const

bool	isNull () const

bool	isEmpty () const

void	setFont (const QFont &)

QFont	font () const
	Return the font.

QFont	usedFont (const QFont &) const

void	setRenderFlags (int)
	Change the render flags. More...

int	renderFlags () const

void	setColor (const QColor &)

QColor	color () const
	Return the pen color, used for painting the text.

QColor	usedColor (const QColor &) const

void	setBorderRadius (double)

double	borderRadius () const

void	setBorderPen (const QPen &)

QPen	borderPen () const

void	setBackgroundBrush (const QBrush &)

QBrush	backgroundBrush () const

void	setPaintAttribute (PaintAttribute, bool on=true)

bool	testPaintAttribute (PaintAttribute) const

void	setLayoutAttribute (LayoutAttribute, bool on=true)

bool	testLayoutAttribute (LayoutAttribute) const

double	heightForWidth (double width, const QFont &=QFont()) const

QSizeF	textSize (const QFont &=QFont()) const

void	draw (QPainter *painter, const QRectF &rect) const

Static Public Member Functions
static const QwtTextEngine *	textEngine (const QString &text, QwtText::TextFormat=AutoText)

static const QwtTextEngine *	textEngine (QwtText::TextFormat)
	Find the text engine for a text format. More...

static void	setTextEngine (QwtText::TextFormat, QwtTextEngine *)

Detailed Description

A class representing a text.

A QwtText is a text including a set of attributes how to render it.

Format
A text might include control sequences (f.e tags) describing how to render it. Each format (f.e MathML, TeX, Qt Rich Text) has its own set of control sequences, that can be handles by a special QwtTextEngine for this format.
Background
A text might have a background, defined by a QPen and QBrush to improve its visibility. The corners of the background might be rounded.
Font
A text might have an individual font.
Color
A text might have an individual color.
Render Flags
Flags from Qt::AlignmentFlag and Qt::TextFlag used like in QPainter::drawText().

See also: QwtTextEngine, QwtTextLabel

Member Enumeration Documentation

◆ LayoutAttribute

enum QwtText::LayoutAttribute

Layout Attributes The layout attributes affects some aspects of the layout of the text.

Enumerator
MinimumLayout	Layout the text without its margins. This mode is useful if a text needs to be aligned accurately, like the tick labels of a scale. If QwtTextEngine::textMargins is not implemented for the format of the text, MinimumLayout has no effect.

◆ PaintAttribute

enum QwtText::PaintAttribute

Paint Attributes.

Font and color and background are optional attributes of a QwtText. The paint attributes hold the information, if they are set.

Enumerator
PaintUsingTextFont	The text has an individual font.
PaintUsingTextColor	The text has an individual color.
PaintBackground	The text has an individual background.

◆ TextFormat

enum QwtText::TextFormat

Text format.

The text format defines the QwtTextEngine, that is used to render the text.

See also: QwtTextEngine, setTextEngine()

Enumerator
AutoText	The text format is determined using QwtTextEngine::mightRender() for all available text engines in increasing order > PlainText. If none of the text engines can render the text is rendered like QwtText::PlainText.
PlainText	Draw the text as it is, using a QwtPlainTextEngine.
RichText	Use the Scribe framework (Qt Rich Text) to render the text.
MathMLText	Use a MathML (http://en.wikipedia.org/wiki/MathML) render engine to display the text. The Qwt MathML extension offers such an engine based on the MathML renderer of the former Qt solutions package. To enable MathML support the following code needs to be added to the application: QwtText::setTextEngine( QwtText::MathMLText, new QwtMathMLTextEngine() );
TeXText	Use a TeX (http://en.wikipedia.org/wiki/TeX) render engine to display the text ( not implemented yet ).
OtherFormat	The number of text formats can be extended using setTextEngine. Formats >= QwtText::OtherFormat are not used by Qwt.

Constructor & Destructor Documentation

◆ QwtText()

QwtText::QwtText	(	const QString &	text = `QString()`,
		QwtText::TextFormat	textFormat = `AutoText`
	)

Constructor

Parameters

text	Text content
textFormat	Text format

Member Function Documentation

◆ backgroundBrush()

QBrush QwtText::backgroundBrush ( ) const

Returns: Background brush

See also: setBackgroundBrush(), borderPen()

◆ borderPen()

QPen QwtText::borderPen ( ) const

Returns: Background pen

See also: setBorderPen(), backgroundBrush()

◆ borderRadius()

double QwtText::borderRadius ( ) const

Returns: Radius for the corners of the border frame

See also: setBorderRadius(), borderPen(), backgroundBrush()

◆ draw()

void QwtText::draw	(	QPainter *	painter,
		const QRectF &	rect
	)		const

Draw a text into a rectangle

Parameters

painter	Painter
rect	Rectangle

◆ heightForWidth()

double QwtText::heightForWidth	(	double	width,
		const QFont &	defaultFont = `QFont()`
	)		const

Find the height for a given width

Parameters

defaultFont	Font, used for the calculation if the text has no font
width	Width

Returns: Calculated height

◆ isEmpty()

bool QwtText::isEmpty ( ) const

inline

Returns: text().isEmpty()

◆ isNull()

bool QwtText::isNull ( ) const

inline

Returns: text().isNull()

◆ renderFlags()

int QwtText::renderFlags ( ) const

Returns: Render flags

See also: setRenderFlags()

◆ setBackgroundBrush()

void QwtText::setBackgroundBrush ( const QBrush & brush )

Set the background brush

Parameters

brush Background brush

See also: backgroundBrush(), setBorderPen()

◆ setBorderPen()

void QwtText::setBorderPen ( const QPen & pen )

Set the background pen

Parameters

pen	Background pen

See also: borderPen(), setBackgroundBrush()

◆ setBorderRadius()

void QwtText::setBorderRadius ( double radius )

Set the radius for the corners of the border frame

Parameters

radius Radius of a rounded corner

See also: borderRadius(), setBorderPen(), setBackgroundBrush()

◆ setColor()

void QwtText::setColor ( const QColor & color )

Set the pen color used for drawing the text.

Parameters

color Color

Note: Setting the color might have no effect, when the text contains control sequences for setting colors.

◆ setFont()

void QwtText::setFont ( const QFont & font )

Set the font.

Parameters

font Font

Note: Setting the font might have no effect, when the text contains control sequences for setting fonts.

◆ setLayoutAttribute()

void QwtText::setLayoutAttribute	(	LayoutAttribute	attribute,
		bool	on = `true`
	)

Change a layout attribute

Parameters

attribute	Layout attribute
on	On/Off

See also: testLayoutAttribute()

◆ setPaintAttribute()

void QwtText::setPaintAttribute	(	PaintAttribute	attribute,
		bool	on = `true`
	)

Change a paint attribute

Parameters

attribute	Paint attribute
on	On/Off

Note: Used by setFont(), setColor(), setBorderPen() and setBackgroundBrush()

See also: testPaintAttribute()

◆ setRenderFlags()

void QwtText::setRenderFlags ( int renderFlags )

Change the render flags.

The default setting is Qt::AlignCenter

Parameters

renderFlags Bitwise OR of the flags used like in QPainter::drawText()

See also: renderFlags(), QwtTextEngine::draw()

Note: Some renderFlags might have no effect, depending on the text format.

◆ setText()

void QwtText::setText	(	const QString &	text,
		QwtText::TextFormat	textFormat = `AutoText`
	)

Assign a new text content

Parameters

text	Text content
textFormat	Text format

See also: text()

◆ setTextEngine()

void QwtText::setTextEngine	(	QwtText::TextFormat	format,
		QwtTextEngine *	engine
	)

static

Assign/Replace a text engine for a text format

With setTextEngine it is possible to extend Qwt with other types of text formats.

For QwtText::PlainText it is not allowed to assign a engine == NULL.

Parameters

format	Text format
engine	Text engine

See also: QwtMathMLTextEngine

Warning: Using QwtText::AutoText does nothing.

◆ testLayoutAttribute()

bool QwtText::testLayoutAttribute ( LayoutAttribute attribute ) const

Test a layout attribute

Parameters

attribute Layout attribute

Returns: true, if attribute is enabled

See also: setLayoutAttribute()

◆ testPaintAttribute()

bool QwtText::testPaintAttribute ( PaintAttribute attribute ) const

Test a paint attribute

Parameters

attribute Paint attribute

Returns: true, if attribute is enabled

See also: setPaintAttribute()

◆ text()

QString QwtText::text ( ) const

Returns: Text as QString.

See also: setText()

◆ textEngine() [1/2]

const QwtTextEngine * QwtText::textEngine	(	const QString &	text,
		QwtText::TextFormat	format = `AutoText`
	)

static

Find the text engine for a text format

In case of QwtText::AutoText the first text engine (beside QwtPlainTextEngine) is returned, where QwtTextEngine::mightRender returns true. If there is none QwtPlainTextEngine is returned.

If no text engine is registered for the format QwtPlainTextEngine is returnd.

Parameters

text	Text, needed in case of AutoText
format	Text format

Returns: Corresponding text engine

◆ textEngine() [2/2]

const QwtTextEngine * QwtText::textEngine ( QwtText::TextFormat format )

static

Find the text engine for a text format.

textEngine can be used to find out if a text format is supported.

Parameters

format Text format

Returns: The text engine, or NULL if no engine is available.

◆ textSize()

QSizeF QwtText::textSize ( const QFont & defaultFont = QFont() ) const

Returns the size, that is needed to render text

Parameters

defaultFont Font of the text

Returns: Calculated size

◆ usedColor()

QColor QwtText::usedColor ( const QColor & defaultColor ) const

Return the color of the text, if it has one. Otherwise return defaultColor.

Parameters

defaultColor Default color

Returns: Color used for drawing the text

See also: setColor(), color(), PaintAttributes

◆ usedFont()

QFont QwtText::usedFont ( const QFont & defaultFont ) const

Return the font of the text, if it has one. Otherwise return defaultFont.

Parameters

defaultFont Default font

Returns: Font used for drawing the text

See also: setFont(), font(), PaintAttributes

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ LayoutAttribute

◆ PaintAttribute

◆ TextFormat

Constructor & Destructor Documentation

◆ QwtText()

Member Function Documentation

◆ backgroundBrush()

◆ borderPen()

◆ borderRadius()

◆ draw()

◆ heightForWidth()

◆ isEmpty()

◆ isNull()

◆ renderFlags()

◆ setBackgroundBrush()

◆ setBorderPen()

◆ setBorderRadius()

◆ setColor()

◆ setFont()

◆ setLayoutAttribute()

◆ setPaintAttribute()

◆ setRenderFlags()

◆ setText()

◆ setTextEngine()

◆ testLayoutAttribute()

◆ testPaintAttribute()

◆ text()

◆ textEngine() [1/2]

◆ textEngine() [2/2]

◆ textSize()

◆ usedColor()

◆ usedFont()