QwtText(3)

NAME
QwtText - A class representing a text.

SYNOPSIS

#include <qwt_text.h>

  Public Types
enum TextFormat { AutoText = 0, PlainText, RichText, MathMLText, TeXText, OtherFormat = 100 }
Text format.
enum PaintAttribute { PaintUsingTextFont = 0x01, PaintUsingTextColor = 0x02, PaintBackground = 0x04 }
Paint Attributes.
enum LayoutAttribute { MinimumLayout = 0x01 }
Layout Attributes The layout attributes affects some aspects of the layout of the text.
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.
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.
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

  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.

  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.

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

Parameters
    text Text content
    textFormat Text format

Member Function Documentation

  QBrush QwtText::backgroundBrush () const

Returns
    Background brush

See also
    setBackgroundBrush(), borderPen()

  QPen QwtText::borderPen () const

Returns
    Background pen

See also
    setBorderPen(), backgroundBrush()

  double QwtText::borderRadius () const

Returns
    Radius for the corners of the border frame

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

  void QwtText::draw (QPainter * painter, const QRectF & rect) const
Draw a text into a rectangle

Parameters
    painter Painter
    rect Rectangle

  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

  bool QwtText::isEmpty () const [inline]

Returns
    text().isEmpty()

  bool QwtText::isNull () const [inline]

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(), setBorderPen()

  void QwtText::setBorderPen (const QPen & pen)
Set the background pen

Parameters
    pen Background pen

See also
    borderPen(), setBackgroundBrush()

  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()

  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.

  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 (LayoutAttribute attribute, bool on = true)
Change a layout attribute

Parameters
    attribute Layout attribute
    on On/Off

See also
    testLayoutAttribute()

  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()

  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.

  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()

  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.

  bool QwtText::testLayoutAttribute (LayoutAttribute attribute) const
Test a layout attribute

Parameters
    attribute Layout attribute

Returns
    true, if attribute is enabled

See also
    setLayoutAttribute()

  bool QwtText::testPaintAttribute (PaintAttribute attribute) const
Test a paint attribute

Parameters
    attribute Paint attribute

Returns
    true, if attribute is enabled

See also
    setPaintAttribute()

  QString QwtText::text () const

Returns
    Text as QString.

See also
    setText()

  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

  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.

  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

  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

  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

Author

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