彻底改版2.0
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feiyangqingyun
346
third/3rd_qwt/qwt_text_engine.cpp
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346
third/3rd_qwt/qwt_text_engine.cpp
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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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#include "qwt_text_engine.h"
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#include "qwt_math.h"
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#include "qwt_painter.h"
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#include <qpainter.h>
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#include <qpixmap.h>
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#include <qimage.h>
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#include <qmap.h>
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#include <qwidget.h>
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#include <qtextobject.h>
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#include <qtextdocument.h>
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#include <qabstracttextdocumentlayout.h>
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static QString taggedRichText( const QString &text, int flags )
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{
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QString richText = text;
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// By default QSimpleRichText is Qt::AlignLeft
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if ( flags & Qt::AlignJustify )
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{
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richText.prepend( QString::fromLatin1( "<div align=\"justify\">" ) );
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richText.append( QString::fromLatin1( "</div>" ) );
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}
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else if ( flags & Qt::AlignRight )
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{
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richText.prepend( QString::fromLatin1( "<div align=\"right\">" ) );
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richText.append( QString::fromLatin1( "</div>" ) );
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}
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else if ( flags & Qt::AlignHCenter )
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{
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richText.prepend( QString::fromLatin1( "<div align=\"center\">" ) );
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richText.append( QString::fromLatin1( "</div>" ) );
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}
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return richText;
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}
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class QwtRichTextDocument: public QTextDocument
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{
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public:
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QwtRichTextDocument( const QString &text, int flags, const QFont &font )
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{
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setUndoRedoEnabled( false );
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setDefaultFont( font );
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setHtml( text );
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// make sure we have a document layout
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( void )documentLayout();
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QTextOption option = defaultTextOption();
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if ( flags & Qt::TextWordWrap )
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option.setWrapMode( QTextOption::WordWrap );
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else
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option.setWrapMode( QTextOption::NoWrap );
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option.setAlignment( static_cast<Qt::Alignment>( flags ) );
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setDefaultTextOption( option );
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QTextFrame *root = rootFrame();
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QTextFrameFormat fm = root->frameFormat();
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fm.setBorder( 0 );
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fm.setMargin( 0 );
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fm.setPadding( 0 );
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fm.setBottomMargin( 0 );
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fm.setLeftMargin( 0 );
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root->setFrameFormat( fm );
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adjustSize();
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}
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};
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class QwtPlainTextEngine::PrivateData
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{
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public:
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int effectiveAscent( const QFont &font ) const
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{
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const QString fontKey = font.key();
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QMap<QString, int>::const_iterator it =
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d_ascentCache.constFind( fontKey );
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if ( it != d_ascentCache.constEnd() )
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return *it;
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const int ascent = findAscent( font );
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d_ascentCache.insert( fontKey, ascent );
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return ascent;
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}
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private:
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int findAscent( const QFont &font ) const
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{
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static const QString dummy( "E" );
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static const QColor white( Qt::white );
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const QFontMetrics fm( font );
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QPixmap pm( fm.width( dummy ), fm.height() );
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pm.fill( white );
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QPainter p( &pm );
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p.setFont( font );
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p.drawText( 0, 0, pm.width(), pm.height(), 0, dummy );
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p.end();
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const QImage img = pm.toImage();
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int row = 0;
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for ( row = 0; row < img.height(); row++ )
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{
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const QRgb *line = reinterpret_cast<const QRgb *>(
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img.scanLine( row ) );
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const int w = pm.width();
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for ( int col = 0; col < w; col++ )
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{
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if ( line[col] != white.rgb() )
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return fm.ascent() - row + 1;
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}
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}
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return fm.ascent();
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}
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mutable QMap<QString, int> d_ascentCache;
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};
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//! Constructor
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QwtTextEngine::QwtTextEngine()
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{
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}
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//! Destructor
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QwtTextEngine::~QwtTextEngine()
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{
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}
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//! Constructor
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QwtPlainTextEngine::QwtPlainTextEngine()
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{
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d_data = new PrivateData;
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}
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//! Destructor
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QwtPlainTextEngine::~QwtPlainTextEngine()
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{
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delete d_data;
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}
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/*!
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Find the height for a given width
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\param font Font of the text
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\param flags Bitwise OR of the flags used like in QPainter::drawText
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\param text Text to be rendered
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\param width Width
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\return Calculated height
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*/
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double QwtPlainTextEngine::heightForWidth( const QFont& font, int flags,
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const QString& text, double width ) const
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{
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const QFontMetricsF fm( font );
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const QRectF rect = fm.boundingRect(
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QRectF( 0, 0, width, QWIDGETSIZE_MAX ), flags, text );
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return rect.height();
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}
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/*!
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Returns the size, that is needed to render text
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\param font Font of the text
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\param flags Bitwise OR of the flags used like in QPainter::drawText
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\param text Text to be rendered
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\return Calculated size
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*/
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QSizeF QwtPlainTextEngine::textSize( const QFont &font,
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int flags, const QString& text ) const
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{
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const QFontMetricsF fm( font );
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const QRectF rect = fm.boundingRect(
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QRectF( 0, 0, QWIDGETSIZE_MAX, QWIDGETSIZE_MAX ), flags, text );
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return rect.size();
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}
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/*!
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Return margins around the texts
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\param font Font of the text
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\param left Return 0
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\param right Return 0
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\param top Return value for the top margin
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\param bottom Return value for the bottom margin
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*/
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void QwtPlainTextEngine::textMargins( const QFont &font, const QString &,
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double &left, double &right, double &top, double &bottom ) const
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{
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left = right = top = 0;
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const QFontMetricsF fm( font );
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top = fm.ascent() - d_data->effectiveAscent( font );
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bottom = fm.descent();
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}
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/*!
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\brief Draw the text in a clipping rectangle
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A wrapper for QPainter::drawText.
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\param painter Painter
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\param rect Clipping rectangle
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\param flags Bitwise OR of the flags used like in QPainter::drawText
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\param text Text to be rendered
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*/
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void QwtPlainTextEngine::draw( QPainter *painter, const QRectF &rect,
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int flags, const QString& text ) const
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{
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QwtPainter::drawText( painter, rect, flags, text );
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}
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/*!
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Test if a string can be rendered by this text engine.
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\return Always true. All texts can be rendered by QwtPlainTextEngine
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*/
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bool QwtPlainTextEngine::mightRender( const QString & ) const
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{
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return true;
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}
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#ifndef QT_NO_RICHTEXT
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//! Constructor
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QwtRichTextEngine::QwtRichTextEngine()
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{
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}
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/*!
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Find the height for a given width
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\param font Font of the text
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\param flags Bitwise OR of the flags used like in QPainter::drawText()
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\param text Text to be rendered
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\param width Width
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\return Calculated height
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*/
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double QwtRichTextEngine::heightForWidth( const QFont& font, int flags,
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const QString& text, double width ) const
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{
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QwtRichTextDocument doc( text, flags, font );
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doc.setPageSize( QSizeF( width, QWIDGETSIZE_MAX ) );
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return doc.documentLayout()->documentSize().height();
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}
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/*!
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Returns the size, that is needed to render text
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\param font Font of the text
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\param flags Bitwise OR of the flags used like in QPainter::drawText()
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\param text Text to be rendered
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\return Calculated size
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*/
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QSizeF QwtRichTextEngine::textSize( const QFont &font,
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int flags, const QString& text ) const
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{
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QwtRichTextDocument doc( text, flags, font );
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QTextOption option = doc.defaultTextOption();
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if ( option.wrapMode() != QTextOption::NoWrap )
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{
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option.setWrapMode( QTextOption::NoWrap );
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doc.setDefaultTextOption( option );
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doc.adjustSize();
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}
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return doc.size();
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}
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/*!
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Draw the text in a clipping rectangle
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\param painter Painter
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\param rect Clipping rectangle
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\param flags Bitwise OR of the flags like in for QPainter::drawText()
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\param text Text to be rendered
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*/
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void QwtRichTextEngine::draw( QPainter *painter, const QRectF &rect,
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int flags, const QString& text ) const
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{
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QwtRichTextDocument doc( text, flags, painter->font() );
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QwtPainter::drawSimpleRichText( painter, rect, flags, doc );
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}
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/*!
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Wrap text into <div align=...> </div> tags according flags
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\param text Text
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\param flags Bitwise OR of the flags like in for QPainter::drawText()
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\return Tagged text
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*/
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QString QwtRichTextEngine::taggedText( const QString &text, int flags ) const
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{
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return taggedRichText( text, flags );
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}
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/*!
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Test if a string can be rendered by this text engine
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\param text Text to be tested
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\return Qt::mightBeRichText(text);
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*/
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bool QwtRichTextEngine::mightRender( const QString &text ) const
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{
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return Qt::mightBeRichText( text );
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}
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/*!
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Return margins around the texts
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\param left Return 0
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\param right Return 0
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\param top Return 0
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\param bottom Return 0
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*/
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void QwtRichTextEngine::textMargins( const QFont &, const QString &,
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double &left, double &right, double &top, double &bottom ) const
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{
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left = right = top = bottom = 0;
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}
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#endif // !QT_NO_RICHTEXT
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