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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