qt_demoe/third/3rd_qwt/qwt_text_label.cpp

325 lines
6.7 KiB
C++

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#include "qwt_text_label.h"
#include "qwt_text.h"
#include "qwt_painter.h"
#include <qpainter.h>
#include <qevent.h>
#include <qmath.h>
class QwtTextLabel::PrivateData
{
public:
PrivateData():
indent( 4 ),
margin( 0 )
{
}
int indent;
int margin;
QwtText text;
};
/*!
Constructs an empty label.
\param parent Parent widget
*/
QwtTextLabel::QwtTextLabel( QWidget *parent ):
QFrame( parent )
{
init();
}
/*!
Constructs a label that displays the text, text
\param parent Parent widget
\param text Text
*/
QwtTextLabel::QwtTextLabel( const QwtText &text, QWidget *parent ):
QFrame( parent )
{
init();
d_data->text = text;
}
//! Destructor
QwtTextLabel::~QwtTextLabel()
{
delete d_data;
}
void QwtTextLabel::init()
{
d_data = new PrivateData();
setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Preferred );
}
/*!
Interface for the designer plugin - does the same as setText()
\sa plainText()
*/
void QwtTextLabel::setPlainText( const QString &text )
{
setText( QwtText( text ) );
}
/*!
Interface for the designer plugin
\return Text as plain text
\sa setPlainText(), text()
*/
QString QwtTextLabel::plainText() const
{
return d_data->text.text();
}
/*!
Change the label's text, keeping all other QwtText attributes
\param text New text
\param textFormat Format of text
\sa QwtText
*/
void QwtTextLabel::setText( const QString &text,
QwtText::TextFormat textFormat )
{
d_data->text.setText( text, textFormat );
update();
updateGeometry();
}
/*!
Change the label's text
\param text New text
*/
void QwtTextLabel::setText( const QwtText &text )
{
d_data->text = text;
update();
updateGeometry();
}
//! Return the text
const QwtText &QwtTextLabel::text() const
{
return d_data->text;
}
//! Clear the text and all QwtText attributes
void QwtTextLabel::clear()
{
d_data->text = QwtText();
update();
updateGeometry();
}
//! Return label's text indent in pixels
int QwtTextLabel::indent() const
{
return d_data->indent;
}
/*!
Set label's text indent in pixels
\param indent Indentation in pixels
*/
void QwtTextLabel::setIndent( int indent )
{
if ( indent < 0 )
indent = 0;
d_data->indent = indent;
update();
updateGeometry();
}
//! Return label's text margin in pixels
int QwtTextLabel::margin() const
{
return d_data->margin;
}
/*!
Set label's margin in pixels
\param margin Margin in pixels
*/
void QwtTextLabel::setMargin( int margin )
{
d_data->margin = margin;
update();
updateGeometry();
}
//! Return a size hint
QSize QwtTextLabel::sizeHint() const
{
return minimumSizeHint();
}
//! Return a minimum size hint
QSize QwtTextLabel::minimumSizeHint() const
{
QSizeF sz = d_data->text.textSize( font() );
int mw = 2 * ( frameWidth() + d_data->margin );
int mh = mw;
int indent = d_data->indent;
if ( indent <= 0 )
indent = defaultIndent();
if ( indent > 0 )
{
const int align = d_data->text.renderFlags();
if ( align & Qt::AlignLeft || align & Qt::AlignRight )
mw += d_data->indent;
else if ( align & Qt::AlignTop || align & Qt::AlignBottom )
mh += d_data->indent;
}
sz += QSizeF( mw, mh );
return QSize( qCeil( sz.width() ), qCeil( sz.height() ) );
}
/*!
\param width Width
\return Preferred height for this widget, given the width.
*/
int QwtTextLabel::heightForWidth( int width ) const
{
const int renderFlags = d_data->text.renderFlags();
int indent = d_data->indent;
if ( indent <= 0 )
indent = defaultIndent();
width -= 2 * frameWidth();
if ( renderFlags & Qt::AlignLeft || renderFlags & Qt::AlignRight )
width -= indent;
int height = qCeil( d_data->text.heightForWidth( width, font() ) );
if ( ( renderFlags & Qt::AlignTop ) || ( renderFlags & Qt::AlignBottom ) )
height += indent;
height += 2 * frameWidth();
return height;
}
/*!
Qt paint event
\param event Paint event
*/
void QwtTextLabel::paintEvent( QPaintEvent *event )
{
QPainter painter( this );
if ( !contentsRect().contains( event->rect() ) )
{
painter.save();
painter.setClipRegion( event->region() & frameRect() );
drawFrame( &painter );
painter.restore();
}
painter.setClipRegion( event->region() & contentsRect() );
drawContents( &painter );
}
//! Redraw the text and focus indicator
void QwtTextLabel::drawContents( QPainter *painter )
{
const QRect r = textRect();
if ( r.isEmpty() )
return;
painter->setFont( font() );
painter->setPen( palette().color( QPalette::Active, QPalette::Text ) );
drawText( painter, QRectF( r ) );
if ( hasFocus() )
{
const int m = 2;
QRect focusRect = contentsRect().adjusted( m, m, -m + 1, -m + 1);
QwtPainter::drawFocusRect( painter, this, focusRect );
}
}
//! Redraw the text
void QwtTextLabel::drawText( QPainter *painter, const QRectF &textRect )
{
d_data->text.draw( painter, textRect );
}
/*!
Calculate geometry for the text in widget coordinates
\return Geometry for the text
*/
QRect QwtTextLabel::textRect() const
{
QRect r = contentsRect();
if ( !r.isEmpty() && d_data->margin > 0 )
{
r.setRect( r.x() + d_data->margin, r.y() + d_data->margin,
r.width() - 2 * d_data->margin, r.height() - 2 * d_data->margin );
}
if ( !r.isEmpty() )
{
int indent = d_data->indent;
if ( indent <= 0 )
indent = defaultIndent();
if ( indent > 0 )
{
const int renderFlags = d_data->text.renderFlags();
if ( renderFlags & Qt::AlignLeft )
r.setX( r.x() + indent );
else if ( renderFlags & Qt::AlignRight )
r.setWidth( r.width() - indent );
else if ( renderFlags & Qt::AlignTop )
r.setY( r.y() + indent );
else if ( renderFlags & Qt::AlignBottom )
r.setHeight( r.height() - indent );
}
}
return r;
}
int QwtTextLabel::defaultIndent() const
{
if ( frameWidth() <= 0 )
return 0;
QFont fnt;
if ( d_data->text.testPaintAttribute( QwtText::PaintUsingTextFont ) )
fnt = d_data->text.font();
else
fnt = font();
return QFontMetrics( fnt ).width( 'x' ) / 2;
}