QwtTextEngine Class Reference
Abstract base class for rendering text strings. More...
#include <qwt_text_engine.h>
Public Member Functions | |
| virtual | ~QwtTextEngine () |
| virtual int | heightForWidth (const QFont &font, int flags, const QString &text, int width) const =0 |
| virtual QSize | textSize (const QFont &font, int flags, const QString &text) const =0 |
| virtual bool | mightRender (const QString &text) const =0 |
| virtual void | textMargins (const QFont &font, const QString &text, int &left, int &right, int &top, int &bottom) const =0 |
| virtual void | draw (QPainter *painter, const QRect &rect, int flags, const QString &text) const =0 |
Protected Member Functions | |
| QwtTextEngine () | |
Detailed Description
Abstract base class for rendering text strings.
A text engine is responsible for rendering texts for a specific text format. They are used by QwtText to render a text.
QwtPlainTextEngine and QwtRichTextEngine are part of the Qwt library.
QwtMathMLTextEngine can be found in Qwt MathML extension, that needs the MathML renderer of the Qt solutions package. Unfortunately it is only available with a commercial Qt license.
- See also:
- QwtText::setTextEngine()
Constructor & Destructor Documentation
| QwtTextEngine::~QwtTextEngine | ( | ) | [virtual] |
Destructor.
| QwtTextEngine::QwtTextEngine | ( | ) | [protected] |
Constructor.
Member Function Documentation
| virtual void QwtTextEngine::draw | ( | QPainter * | painter, | |
| const QRect & | rect, | |||
| int | flags, | |||
| const QString & | text | |||
| ) | const [pure virtual] |
Draw the text in a clipping rectangle
- Parameters:
-
painter Painter rect Clipping rectangle flags Bitwise OR of the flags like in for QPainter::drawText text Text to be rendered
Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.
| virtual int QwtTextEngine::heightForWidth | ( | const QFont & | font, | |
| int | flags, | |||
| const QString & | text, | |||
| int | width | |||
| ) | const [pure 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
Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.
| virtual bool QwtTextEngine::mightRender | ( | const QString & | text | ) | const [pure virtual] |
Test if a string can be rendered by this text engine
- Parameters:
-
text Text to be tested
- Returns:
- true, if it can be rendered
Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.
| virtual void QwtTextEngine::textMargins | ( | const QFont & | font, | |
| const QString & | text, | |||
| int & | left, | |||
| int & | right, | |||
| int & | top, | |||
| int & | bottom | |||
| ) | const [pure virtual] |
Return margins around the texts
The textSize might include margins around the text, like QFontMetrics::descent. In situations where texts need to be aligend in detail, knowing these margins might improve the layout calculations.
- Parameters:
-
font Font of the text text Text to be rendered left Return value for the left margin right Return value for the right margin top Return value for the top margin bottom Return value for the bottom margin
Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.
| virtual QSize QwtTextEngine::textSize | ( | const QFont & | font, | |
| int | flags, | |||
| const QString & | text | |||
| ) | const [pure virtual] |
Returns the size, that is needed to render text
- Parameters:
-
font Font of the text flags Bitwise OR of the flags like in for QPainter::drawText text Text to be rendered
- Returns:
- Caluclated size
Implemented in QwtPlainTextEngine, QwtRichTextEngine, and QwtMathMLTextEngine.
Generated on Wed Sep 2 18:37:28 2009 for Qwt User's Guide by
1.6.1