QwtPlainTextEngine Class Reference

A text engine for plain texts. More...

#include <qwt_text_engine.h>

Inheritance diagram for QwtPlainTextEngine:

Collaboration diagram for QwtPlainTextEngine:

List of all members.

Classes
class	PrivateData
Public Member Functions
	QwtPlainTextEngine ()
	Constructor.
virtual	~QwtPlainTextEngine ()
	Destructor.
virtual int	heightForWidth (const QFont &font, int flags, const QString &text, int width) const
virtual QSize	textSize (const QFont &font, int flags, const QString &text) const
virtual void	draw (QPainter *painter, const QRect &rect, int flags, const QString &text) const
	Draw the text in a clipping rectangle.
virtual bool	mightRender (const QString &) const
virtual void	textMargins (const QFont &, const QString &, int &left, int &right, int &top, int &bottom) const

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Detailed Description

A text engine for plain texts.

QwtPlainTextEngine renders texts using the basic Qt classes QPainter and QFontMetrics.

Definition at line 116 of file qwt_text_engine.h.

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Constructor & Destructor Documentation

QwtPlainTextEngine::QwtPlainTextEngine

(

)

Constructor.

Definition at line 180 of file qwt_text_engine.cpp.

{
    d_data = new PrivateData;
}

QwtPlainTextEngine::~QwtPlainTextEngine

(

)

[virtual]

Destructor.

Definition at line 186 of file qwt_text_engine.cpp.

{
    delete d_data;
}

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Member Function Documentation

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

Draw the text in a clipping rectangle.

A wrapper for QPainter::drawText.

Parameters:

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

Implements QwtTextEngine.

Definition at line 259 of file qwt_text_engine.cpp.

References QwtPainter::drawText().

{
    QwtPainter::drawText(painter, rect, flags, text);
}

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

Find the height for a given width

Parameters:

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

Returns:

Calculated height

Implements QwtTextEngine.

Definition at line 201 of file qwt_text_engine.cpp.

{
    const QFontMetrics fm(font);
    const QRect rect = fm.boundingRect(
        0, 0, width, QWIDGETSIZE_MAX, flags, text);

    return rect.height();
}

bool QwtPlainTextEngine::mightRender

(

const QString &

)

const [virtual]

Test if a string can be rendered by this text engine.

Returns:

Always true. All texts can be rendered by QwtPlainTextEngine

Implements QwtTextEngine.

Definition at line 269 of file qwt_text_engine.cpp.

{
    return true;
}

void QwtPlainTextEngine::textMargins	(	const QFont &	font,
		const QString &	,
		int &	left,
		int &	right,
		int &	top,
		int &	bottom
	)		const [virtual]

Return margins around the texts

Parameters:

font	Font of the text
left	Return 0
right	Return 0
top	Return value for the top margin
bottom	Return value for the bottom margin

Implements QwtTextEngine.

Definition at line 239 of file qwt_text_engine.cpp.

References QwtPlainTextEngine::PrivateData::effectiveAscent().

{
    left = right = top = 0;

    const QFontMetrics fm(font);
    top = fm.ascent() - d_data->effectiveAscent(font);
    bottom = fm.descent() + 1;
}

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

Returns the size, that is needed to render text

Parameters:

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

Returns:

Caluclated size

Implements QwtTextEngine.

Definition at line 220 of file qwt_text_engine.cpp.

{
    const QFontMetrics fm(font);
    const QRect rect = fm.boundingRect(
        0, 0, QWIDGETSIZE_MAX, QWIDGETSIZE_MAX, flags, text);

    return rect.size();
}

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The documentation for this class was generated from the following files:

• qwt_text_engine.h
• qwt_text_engine.cpp