彻底改版2.0
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feiyangqingyun
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third/3rd_qwt/qwt_text.h
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226
third/3rd_qwt/qwt_text.h
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_TEXT_H
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#define QWT_TEXT_H
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#include "qwt_global.h"
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#include <qstring.h>
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#include <qsize.h>
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#include <qfont.h>
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#include <qmetatype.h>
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class QColor;
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class QPen;
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class QBrush;
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class QRectF;
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class QPainter;
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class QwtTextEngine;
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/*!
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\brief A class representing a text
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A QwtText is a text including a set of attributes how to render it.
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- Format\n
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A text might include control sequences (f.e tags) describing
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how to render it. Each format (f.e MathML, TeX, Qt Rich Text)
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has its own set of control sequences, that can be handles by
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a special QwtTextEngine for this format.
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- Background\n
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A text might have a background, defined by a QPen and QBrush
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to improve its visibility. The corners of the background might
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be rounded.
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- Font\n
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A text might have an individual font.
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- Color\n
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A text might have an individual color.
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- Render Flags\n
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Flags from Qt::AlignmentFlag and Qt::TextFlag used like in
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QPainter::drawText().
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\sa QwtTextEngine, QwtTextLabel
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*/
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class QWT_EXPORT QwtText
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{
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public:
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/*!
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\brief Text format
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The text format defines the QwtTextEngine, that is used to render
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the text.
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\sa QwtTextEngine, setTextEngine()
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*/
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enum TextFormat
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{
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/*!
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The text format is determined using QwtTextEngine::mightRender() for
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all available text engines in increasing order > PlainText.
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If none of the text engines can render the text is rendered
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like QwtText::PlainText.
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*/
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AutoText = 0,
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//! Draw the text as it is, using a QwtPlainTextEngine.
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PlainText,
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//! Use the Scribe framework (Qt Rich Text) to render the text.
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RichText,
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/*!
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Use a MathML (http://en.wikipedia.org/wiki/MathML) render engine
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to display the text. The Qwt MathML extension offers such an engine
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based on the MathML renderer of the former Qt solutions package.
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To enable MathML support the following code needs to be added to the
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application:
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\code
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QwtText::setTextEngine( QwtText::MathMLText, new QwtMathMLTextEngine() );
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\endcode
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*/
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MathMLText,
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/*!
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Use a TeX (http://en.wikipedia.org/wiki/TeX) render engine
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to display the text ( not implemented yet ).
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*/
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TeXText,
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/*!
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The number of text formats can be extended using setTextEngine.
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Formats >= QwtText::OtherFormat are not used by Qwt.
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*/
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OtherFormat = 100
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};
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/*!
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\brief Paint Attributes
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Font and color and background are optional attributes of a QwtText.
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The paint attributes hold the information, if they are set.
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*/
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enum PaintAttribute
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{
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//! The text has an individual font.
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PaintUsingTextFont = 0x01,
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//! The text has an individual color.
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PaintUsingTextColor = 0x02,
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//! The text has an individual background.
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PaintBackground = 0x04
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};
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//! Paint attributes
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typedef QFlags<PaintAttribute> PaintAttributes;
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/*!
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\brief Layout Attributes
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The layout attributes affects some aspects of the layout of the text.
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*/
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enum LayoutAttribute
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{
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/*!
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Layout the text without its margins. This mode is useful if a
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text needs to be aligned accurately, like the tick labels of a scale.
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If QwtTextEngine::textMargins is not implemented for the format
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of the text, MinimumLayout has no effect.
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*/
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MinimumLayout = 0x01
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};
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//! Layout attributes
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typedef QFlags<LayoutAttribute> LayoutAttributes;
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QwtText( const QString & = QString(),
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TextFormat textFormat = AutoText );
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QwtText( const QwtText & );
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~QwtText();
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QwtText &operator=( const QwtText & );
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bool operator==( const QwtText & ) const;
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bool operator!=( const QwtText & ) const;
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void setText( const QString &,
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QwtText::TextFormat textFormat = AutoText );
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QString text() const;
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bool isNull() const;
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bool isEmpty() const;
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void setFont( const QFont & );
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QFont font() const;
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QFont usedFont( const QFont & ) const;
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void setRenderFlags( int );
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int renderFlags() const;
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void setColor( const QColor & );
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QColor color() const;
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QColor usedColor( const QColor & ) const;
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void setBorderRadius( double );
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double borderRadius() const;
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void setBorderPen( const QPen & );
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QPen borderPen() const;
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void setBackgroundBrush( const QBrush & );
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QBrush backgroundBrush() const;
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void setPaintAttribute( PaintAttribute, bool on = true );
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bool testPaintAttribute( PaintAttribute ) const;
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void setLayoutAttribute( LayoutAttribute, bool on = true );
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bool testLayoutAttribute( LayoutAttribute ) const;
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double heightForWidth( double width, const QFont & = QFont() ) const;
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QSizeF textSize( const QFont & = QFont() ) const;
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void draw( QPainter *painter, const QRectF &rect ) const;
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static const QwtTextEngine *textEngine(
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const QString &text, QwtText::TextFormat = AutoText );
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static const QwtTextEngine *textEngine( QwtText::TextFormat );
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static void setTextEngine( QwtText::TextFormat, QwtTextEngine * );
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private:
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class PrivateData;
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PrivateData *d_data;
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class LayoutCache;
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LayoutCache *d_layoutCache;
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};
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//! \return text().isNull()
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inline bool QwtText::isNull() const
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{
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return text().isNull();
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}
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//! \return text().isEmpty()
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inline bool QwtText::isEmpty() const
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{
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return text().isEmpty();
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}
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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtText::PaintAttributes )
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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtText::LayoutAttributes )
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Q_DECLARE_METATYPE( QwtText )
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#endif
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