dtkDoubleSpinBox.cpp 4.81 KB
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// Version: $Id$
//
//

// Commentary:
//
//

// Change Log:
//
//

// Code:

#include "dtkDoubleSpinBox.h"

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class dtkDoubleSpinBoxPrivate : public QObject
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{
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    Q_OBJECT

public slots:
    void update();
    void touch();

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public:
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    double            value;

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    QDoubleValidator *validator;
    bool              scientific;
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    int               decimals;
    double            minimum;
    double            maximum;
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public:
    QString textFromValue ( double ) const;
    double  valueFromText ( const QString& ) const;
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    QValidator::State validate(QString&, int&) const;
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public:
    dtkDoubleSpinBox *q;
};

void dtkDoubleSpinBoxPrivate::update(void)
{
    this->value = valueFromText( q->text());
    this->touch();
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}

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void dtkDoubleSpinBoxPrivate::touch()
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{
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    q->emit valueChanged(this->value);
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}

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QString dtkDoubleSpinBoxPrivate::textFromValue ( double value ) const
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{
    QString strValue;
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    if (this->scientific)
        strValue = QString::number(value, 'e', this->decimals);
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    else
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        strValue = QString::number(value, 'f', this->decimals);
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    return strValue;
}

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#include <cstdlib>
double dtkDoubleSpinBoxPrivate::valueFromText ( const QString & text ) const
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{
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    // truncate the input text to the right decimal
    QString work_on = text;

    QStringList mant_exp;
    if ( this->scientific ) { // split mantisse + exp
        mant_exp = text.split(QRegExp("e"));
        work_on = mant_exp[0];
    }

    QStringList int_dec;
    int_dec = work_on.split(QRegExp("\\."));

    // truncate decimals
    if (int_dec.size() > 1) {
        if ( int_dec[1].length() > this->decimals) {
            int_dec[1] = int_dec[1].left(this->decimals);
        }
    }

    QString result = int_dec[0] + "." + int_dec[1];
    if ( this->scientific && mant_exp.size() > 1) {
        result += "e" + mant_exp[1];
    }
    else {
        result += "e+0" ;
    }
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    double dblValue = result.toDouble();
    //q->lineEdit()->blockSignals(true);  // protected !!
    //q->lineEdit()->setText(result);
    //q->lineEdit()->blockSignals(false);
    q->setValue(dblValue);
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    return dblValue;
}

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QValidator::State dtkDoubleSpinBoxPrivate::validate(QString &text, int &pos) const
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{
    // check user input
    bool input_check;
    text.toDouble(&input_check);

    return (input_check ? QValidator::Acceptable : QValidator::Invalid);
}
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///

dtkDoubleSpinBox::dtkDoubleSpinBox(QDoubleValidator::Notation notation, QWidget *parent) : QAbstractSpinBox(parent)
{
    d = new dtkDoubleSpinBoxPrivate;
    d->q = this;

    this->setLocale(QLocale::C);

    d->value = 0.0;

    d->validator = new QDoubleValidator();
    d->validator->setNotation(notation);

    d->scientific = ( notation == QDoubleValidator::ScientificNotation);

    //this->setMaximum(std::numeric_limits<double>::max());    // instead of default 99.99
    //this->setMaximum(std::numeric_limits<double>::lowest());
    //this->setDecimals(32);
    d->maximum = std::numeric_limits<double>::max();    // instead of default 99.99
    d->minimum = std::numeric_limits<double>::lowest();
    d->decimals = 32;

    this->setReadOnly(false);
    this->setButtonSymbols(QAbstractSpinBox::PlusMinus);
    this->setCorrectionMode(QAbstractSpinBox::CorrectToPreviousValue);
    this->setKeyboardTracking(true);
    this->lineEdit()->setValidator(d->validator);
    this->lineEdit()->setReadOnly(false);

    connect(this,
            SIGNAL(editingFinished()),
            d,
            SLOT(update()));

}

dtkDoubleSpinBox::~dtkDoubleSpinBox(void)
{
    delete d->validator;
    delete d;
}

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void dtkDoubleSpinBox::stepBy(int step)
{
    if (step == 0 ) {
        return;
    }
    if (step < 0) {
        int i = step;
        while ( i < 0 ) {
            stepDown();
            i++;
        }
    }
    else  {
        int i = step;
        while ( i > 0) {
            stepUp();
            i--;
        }
    }
}

void dtkDoubleSpinBox::stepDown(void)
{
    if (d->scientific)
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        d->value /= 10.0;
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    else
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        d->value -= 1.0;

    d->touch();
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}

void dtkDoubleSpinBox::stepUp(void)
{
    if (d->scientific)
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        d->value *= 10.0;
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    else
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        d->value += 1.0;

    d->touch();
}


void dtkDoubleSpinBox::setMinimum(double min)
{
    d->minimum = min;
}

void dtkDoubleSpinBox::setMaximum(double max)
{
    d->maximum = max;
}

void dtkDoubleSpinBox::setValue(double val)
{
    d->value = val;
    this->lineEdit()->blockSignals(true);
    this->lineEdit()->setText(d->textFromValue(val));
    this->lineEdit()->blockSignals(false);
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}
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void dtkDoubleSpinBox::setDecimals(int dec)
{
    d->decimals = dec;
    this->setValue(d->value);  // muste change the text in the widget accordingly
}

QAbstractSpinBox::StepEnabled dtkDoubleSpinBox::stepEnabled(void) const
{
    return ( QAbstractSpinBox::StepUpEnabled | QAbstractSpinBox::StepDownEnabled ) ;
}


#include "dtkDoubleSpinBox.moc"

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//
// dtkDoubleSpinBox.h ends here