QwtText (3)

#include <qwt_text.h>

Public Types

enum LayoutAttribute { MinimumLayout = 1 }

enum PaintAttribute { PaintUsingTextFont = 1, PaintUsingTextColor = 2, PaintBackground = 4 }

enum TextFormat { AutoText = 0, PlainText, RichText, MathMLText, TeXText, OtherFormat = 100 }

Public Member Functions

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

QwtText (const QwtText &)

~QwtText ()

QBrush backgroundBrush () const

QPen backgroundPen () const

QColor color () const

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

QFont font () const

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

bool isEmpty () const

bool isNull () const

int operator!= (const QwtText &) const

QwtText & operator= (const QwtText &)

int operator== (const QwtText &) const

int renderFlags () const

void setBackgroundBrush (const QBrush &)

void setBackgroundPen (const QPen &)

void setColor (const QColor &)

void setFont (const QFont &)

void setLayoutAttribute (LayoutAttribute, bool on=true)

void setPaintAttribute (PaintAttribute, bool on=true)

void setRenderFlags (int flags)

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

bool testLayoutAttribute (LayoutAttribute) const

bool testPaintAttribute (PaintAttribute) const

QString text () const

QSize textSize (const QFont &=QFont()) const

QColor usedColor (const QColor &) const

QFont usedFont (const QFont &) const

Static Public Member Functions

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

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

static const QwtTextEngine * textEngine (QwtText::TextFormat)

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 QwtTextEngine for this format.

• Background

  A text might have a background, defined by a QPen and QBrush to improve its visibility.

• 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

enum \fBQwtText::LayoutAttribute\fP

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

• 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.

enum \fBQwtText::PaintAttribute\fP

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

• PaintUsingTextFont

  The text has an individual font.

• PaintUsingTextColor

  The text has an individual color.

• PaintBackground

  The text has an individual background.

enum \fBQwtText::TextFormat\fP

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

• 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 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 Qt solutions package. Unfortunately it is only available for owners of a commercial Qt license.

• TeXText

  Use a TeX (http://en.wikipedia.org/wiki/TeX) render engine to display the text.

• OtherFormat

  The number of text formats can be extended using setTextEngine. Formats >= OtherFormat are not used by Qwt.

See also:

QwtTextEngine, setTextEngine()

QwtText::QwtText (const QString &text = \fCQString::null\fP, \fBQwtText::TextFormat\fPtextFormat = \fCAutoText\fP)

Constructor

Parameters:

text Text content

textFormat Text format

QBrush QwtText::backgroundBrush () const

Returns:

Background brush

See also:

setBackgroundBrush(), backgroundPen()

QPen QwtText::backgroundPen () const

Returns:

Background pen

See also:

setBackgroundPen(), backgroundBrush()

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

Draw a text into a rectangle

Parameters:

painter Painter

rect Rectangle

int QwtText::heightForWidth (intwidth, const QFont &defaultFont = \fCQFont()\fP) 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

bool QwtText::isEmpty () const\fC [inline]\fP

Returns:

text().isEmpty()

bool QwtText::isNull () const\fC [inline]\fP

Returns:

text().isNull()

int QwtText::renderFlags () const

Returns:

Render flags

See also:

setRenderFlags()

void QwtText::setBackgroundBrush (const QBrush &brush)

Set the background brush

Parameters:

brush Background brush

See also:

backgroundBrush(), setBackgroundPen()

void QwtText::setBackgroundPen (const QPen &pen)

Set the background pen

Parameters:

pen Background pen

See also:

backgroundPen(), setBackgroundBrush()

void QwtText::setColor (const QColor &color)

Set the pen color used for painting the text.

Parameters:

color Color

Note:

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

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.

void QwtText::setLayoutAttribute (\fBLayoutAttribute\fPattribute, boolon = \fCtrue\fP)

Change a layout attribute

Parameters:

attribute Layout attribute

on On/Off

See also:

testLayoutAttribute()

void QwtText::setPaintAttribute (\fBPaintAttribute\fPattribute, boolon = \fCtrue\fP)

Change a paint attribute

Parameters:

attribute Paint attribute

on On/Off

Note:

Used by setFont(), setColor(), setBackgroundPen() and setBackgroundBrush()

See also:

testPaintAttribute()

void QwtText::setRenderFlags (intrenderFlags)

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.

void QwtText::setText (const QString &text, \fBQwtText::TextFormat\fPtextFormat = \fCAutoText\fP)

Assign a new text content

Parameters:

text Text content

textFormat Text format

See also:

text()

void QwtText::setTextEngine (\fBQwtText::TextFormat\fPformat, \fBQwtTextEngine\fP *engine)\fC [static]\fP

Assign/Replace a text engine for a text format

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

Owner of a commercial Qt license can build the qwtmathml library, that is based on the MathML renderer, that is included in MML Widget component of the Qt solutions package.

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.

bool QwtText::testLayoutAttribute (\fBLayoutAttribute\fPattribute) const

Test a layout attribute

Parameters:

attribute Layout attribute

Returns:

true, if attribute is enabled

See also:

setLayoutAttribute()

bool QwtText::testPaintAttribute (\fBPaintAttribute\fPattribute) const

Test a paint attribute

Parameters:

attribute Paint attribute

Returns:

true, if attribute is enabled

See also:

setPaintAttribute()

QString QwtText::text () const

Return the text.

See also:

setText()

const \fBQwtTextEngine\fP * QwtText::textEngine (const QString &text, \fBQwtText::TextFormat\fPformat = \fCAutoText\fP)\fC [static]\fP

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 returnd.

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

Parameters:

text Text, needed in case of AutoText

format Text format

const \fBQwtTextEngine\fP * QwtText::textEngine (\fBQwtText::TextFormat\fPformat)\fC [static]\fP

Find the text engine for a text format. textEngine can be used to find out if a text format is supported. F.e, if one wants to use MathML labels, the MathML renderer from the commercial Qt solutions package might be required, that is not available in Qt Open Source Edition environments.

Parameters:

format Text format

Returns:

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

QSize QwtText::textSize (const QFont &defaultFont = \fCQFont()\fP) const

Find the height for a given width

Parameters:

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

Returns:

Calculated height

Returns the size, that is needed to render text

Parameters:

defaultFont Font of the text

Returns:

Caluclated size

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

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

Parameters:

defaultColor Default color

See also:

setColor(), color(), PaintAttributes

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

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

Parameters:

defaultFont Default font

See also:

setFont(), font(), PaintAttributes

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