doublespinbox.cpp

/***************************************************************************
 *   Copyright (C) 2003-2004 by David Saxton                               *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/

#include "cnitem.h"
#include "doublespinbox.h"

#include <kdebug.h>
#include <kglobal.h>
#include <klocale.h>

#include <qlineedit.h>
#include <qregexp.h>
#include <qtimer.h>

#include <algorithm>
#include <cmath>
using namespace std;


inline int roundDouble( double val )
{
        return (val > 0) ? int(val+0.5) : int(val-0.5);
}


DoubleSpinBox::DoubleSpinBox( double lower, double upper, double minAbs, double value, const QString &unit, QWidget * parent )
        : QSpinBox( parent )
{
        m_lastEmittedValue = value;
        m_unit = unit;
        m_minValue = lower;
        m_maxValue = upper;
        m_minAbsValue = minAbs;
        m_queuedSuffix = QString::null;
        
        editor()->setAlignment( Qt::AlignRight );
        
        connect( this, SIGNAL(valueChanged(int)), this, SLOT(checkIfChanged()) );
        QSpinBox::setMinValue( -(1<<30) );
        QSpinBox::setMaxValue( +(1<<30) );      
        setValue( value );
        
        setValidator( 0 );
}


DoubleSpinBox::~DoubleSpinBox()
{
}


double DoubleSpinBox::value()
{
        return getDisplayedNumber( 0 ) * getMult();
}


void DoubleSpinBox::setValue( double value )
{
        if ( value > maxValue() )
                value = maxValue();
        
        else if ( value < minValue() )
                value = minValue();
        
        if ( std::abs(value) < m_minAbsValue*0.9999 )
                value = 0.0;
        
        updateSuffix( value );
        
        QSpinBox::setValue( roundDouble( (value / Item::getMultiplier( value )) * 100 ) );
}


void DoubleSpinBox::setUnit( const QString & unit )
{
        updateSuffix( value() );
        m_unit = unit;
}


void DoubleSpinBox::updateSuffix( double value )
{
        m_queuedSuffix = " " + CNItem::getNumberMag( value ) + m_unit;
        
        // Set suffix to be empty if it is nothing but white space
        if ( m_queuedSuffix.stripWhiteSpace().isEmpty() )
                m_queuedSuffix = "";
        
        QTimer::singleShot( 0, this, SLOT(setQueuedSuffix()) );
}


void DoubleSpinBox::setQueuedSuffix()
{
        bool changed = false;
        if ( !m_queuedSuffix.isNull() && suffix() != m_queuedSuffix )
        {
                setSuffix( m_queuedSuffix );
                changed = true;
        }
        m_queuedSuffix = QString::null;
        
        if ( changed )
                emit valueChanged( value() );
}


double DoubleSpinBox::getMult()
{
        QString text = this->text().stripWhiteSpace();
        if ( !m_queuedSuffix.isNull() )
        {
                QString nsSuffix = suffix().stripWhiteSpace();
                
                if ( nsSuffix.isEmpty() )
                        text.append( m_queuedSuffix );
                else
                        text.replace( nsSuffix, m_queuedSuffix );
        }
        
        if ( text.length() == 0 )
                return 1.0;
        
        if ( text.endsWith( m_unit, false ) )
                text = text.remove( text.length() - m_unit.length(), m_unit.length() );
        
        text.stripWhiteSpace();
        
        QChar siExp = text[ text.length()-1 ];
        
        if ( siExp.isLetter() || siExp.isSymbol() ) 
                return CNItem::getMultiplier((QString)siExp);
        
        else
                return 1;
}


double DoubleSpinBox::getDisplayedNumber( bool * ok )
{
        KLocale * locale = KGlobal::locale();
        
        // Fetch the characters that we don't want to discard
        const QString exclude = locale->decimalSymbol()
                        + locale->thousandsSeparator()
                        + locale->positiveSign()
                        + locale->negativeSign();
        
        QString number = cleanText().remove( QRegExp("[^"+exclude+"\\d]") );
        
        return locale->readNumber( number, ok );
}


int DoubleSpinBox::mapTextToValue( bool * ok )
{
        (void)ok;
        
        double value = this->value();
        
        if ( value > maxValue() )
                value = maxValue();
        
        else if ( value < minValue() )
                value = minValue();
        
        if ( std::abs(value) < m_minAbsValue*0.9999 )
                value = 0.0;
        
        updateSuffix( value );
        
        value /= Item::getMultiplier( value );
        
        // Precision of 2 extra digits
        return int( value * 100 );
}


QString DoubleSpinBox::mapValueToText( int v )
{
        double val = double(v)/100.0;
        
        int leftDigits = (int)floor( log10( abs(val) ) ) + 1;
        if ( leftDigits < 0 )
                leftDigits = 0;
        else if ( leftDigits > 3 )
                leftDigits = 3;
        
        KLocale * locale = KGlobal::locale();
        return locale->formatNumber( val, 3-leftDigits );
}


void DoubleSpinBox::checkIfChanged()
{
        double newValue = value();
        
        if ( m_lastEmittedValue == newValue )
                return;
        
        m_lastEmittedValue = newValue;
        emit valueChanged( m_lastEmittedValue );
}


double DoubleSpinBox::roundToOneSF( double value )
{
        if ( value == 0.0 )
                return 0.0;
        
        value *= 1.000001;
        double tens = pow( 10.0, floor(log10( abs(value) )) );
        
        return int ( value / tens ) * tens;
}


void DoubleSpinBox::stepUp()
{
        double value = roundToOneSF( this->value() );
        
        if ( value == 0 )
                value = m_minAbsValue;
        
        else if ( value > 0 )
                value += std::pow( 10., std::floor( std::log10(value) ) );
        
        else
        {
                double sub = std::pow(10., std::floor( std::log10(std::abs(value))-1) );
                value += std::pow( 10., std::floor( std::log10(std::abs(value)-sub) ) );
        }
        
        value *= 1.00001;
        
        if ( std::abs(value) < m_minAbsValue )
                value = 0.;
        
        setValue( value );
}


void DoubleSpinBox::stepDown()
{
        double value = roundToOneSF( this->value() );
        
        if ( value == 0 )
                value = -m_minAbsValue;
        
        else if ( value > 0 )
        {
                double sub = std::pow(10., std::floor( std::log10(value)-1) );
                value -= std::pow( 10., std::floor( std::log10(value-sub) ) );
        }
        else
        {
                double add = std::pow(10., std::floor( std::log10(std::abs(value))-1) );
                value -= std::pow( 10., std::floor( std::log10(std::abs(value)+add) ) );
        }
        
        value *= 1.00001;
        
        if ( std::abs(value) < m_minAbsValue )
                value = 0.;
        
        setValue( value );
}

#include "doublespinbox.moc"

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