qspinbox.cpp

奇趣公司比较新的qt/emd版本

    input.remove(d->thousand);
}


// --- QDoubleSpinBox ---

/*!
    \class QDoubleSpinBox
    \brief The QDoubleSpinBox class provides a spin box widget that
    takes doubles.

    \ingroup basicwidgets
    \mainclass

    QDoubleSpinBox allows the user to choose a value by clicking the
    up and down buttons or by pressing Up or Down on the keyboard to
    increase or decrease the value currently displayed. The user can
    also type the value in manually. The spin box supports double
    values but can be extended to use different strings with
    validate(), textFromValue() and valueFromText().

    Every time the value changes QDoubleSpinBox emits the
    valueChanged() signal. The current value can be fetched with
    value() and set with setValue().

    Note: QDoubleSpinBox will round numbers so they can be displayed
    with the current precision. In a QDoubleSpinBox with decimals set
    to 2, calling setValue(2.555) will cause value() to return 2.56.

    Clicking the up and down buttons or using the keyboard accelerator's
    Up and Down arrows will increase or decrease the current value in
    steps of size singleStep(). If you want to change this behavior you
    can reimplement the virtual function stepBy(). The minimum and
    maximum value and the step size can be set using one of the
    constructors, and can be changed later with setMinimum(),
    setMaximum() and setSingleStep(). The spinbox has a default
    precision of 2 decimal places but this can be changed using
    setDecimals().

    Most spin boxes are directional, but QDoubleSpinBox can also
    operate as a circular spin box, i.e. if the range is 0.0-99.9 and
    the current value is 99.9, clicking "up" will give 0 if wrapping()
    is set to true. Use setWrapping() if you want circular behavior.

    The displayed value can be prepended and appended with arbitrary
    strings indicating, for example, currency or the unit of
    measurement. See setPrefix() and setSuffix(). The text in the spin
    box is retrieved with text() (which includes any prefix() and
    suffix()), or with cleanText() (which has no prefix(), no suffix()
    and no leading or trailing whitespace).

    It is often desirable to give the user a special (often default)
    choice in addition to the range of numeric values. See
    setSpecialValueText() for how to do this with QDoubleSpinBox.

    \sa QSpinBox, QDateTimeEdit, QSlider, {Spin Boxes Example}
*/

/*!
    \fn void QDoubleSpinBox::valueChanged(double d);

    This signal is emitted whenever the spin box's value is changed.
    The new value is passed in \a d.
*/

/*!
    \fn void QDoubleSpinBox::valueChanged(const QString &text);

    \overload

    The new value is passed literally in \a text with no prefix() or
    suffix().
*/

/*!
    Constructs a spin box with 0.0 as minimum value and 99.99 as maximum value,
    a step value of 1.0 and a precision of 2 decimal places. The value is
    initially set to 0.00. The spin box has the given \a parent.

    \sa setMinimum(), setMaximum(), setSingleStep()
*/
QDoubleSpinBox::QDoubleSpinBox(QWidget *parent)
    : QAbstractSpinBox(*new QDoubleSpinBoxPrivate, parent)
{
}

/*!
    \property QDoubleSpinBox::value
    \brief the value of the spin box

    setValue() will emit valueChanged() if the new value is different
    from the old one.

    Note: The value will be rounded so it can be displayed with the
    current setting of decimals.

    \sa decimals
*/
double QDoubleSpinBox::value() const
{
    Q_D(const QDoubleSpinBox);

    return d->value.toDouble();
}

void QDoubleSpinBox::setValue(double value)
{
    Q_D(QDoubleSpinBox);
    QVariant v(d->round(value));
    d->setValue(v, EmitIfChanged);
}
/*!
    \property QDoubleSpinBox::prefix
    \brief the spin box's prefix

    The prefix is prepended to the start of the displayed value.
    Typical use is to display a unit of measurement or a currency
    symbol. For example:

    \code
        spinbox->setPrefix("$");
    \endcode

    To turn off the prefix display, set this property to an empty
    string. The default is no prefix. The prefix is not displayed when
    value() == minimum() and specialValueText() is set.

    If no prefix is set, prefix() returns an empty string.

    \sa suffix(), setSuffix(), specialValueText(), setSpecialValueText()
*/

QString QDoubleSpinBox::prefix() const
{
    Q_D(const QDoubleSpinBox);

    return d->prefix;
}

void QDoubleSpinBox::setPrefix(const QString &prefix)
{
    Q_D(QDoubleSpinBox);

    d->prefix = prefix;
    d->updateEdit();
}

/*!
    \property QDoubleSpinBox::suffix
    \brief the suffix of the spin box

    The suffix is appended to the end of the displayed value. Typical
    use is to display a unit of measurement or a currency symbol. For
    example:

    \code
        spinbox->setSuffix(" km");
    \endcode

    To turn off the suffix display, set this property to an empty
    string. The default is no suffix. The suffix is not displayed for
    the minimum() if specialValueText() is set.

    If no suffix is set, suffix() returns an empty string.

    \sa prefix(), setPrefix(), specialValueText(), setSpecialValueText()
*/

QString QDoubleSpinBox::suffix() const
{
    Q_D(const QDoubleSpinBox);

    return d->suffix;
}

void QDoubleSpinBox::setSuffix(const QString &suffix)
{
    Q_D(QDoubleSpinBox);

    d->suffix = suffix;
    d->updateEdit();
}

/*!
    \property QDoubleSpinBox::cleanText

    \brief the text of the spin box excluding any prefix, suffix,
    or leading or trailing whitespace.

    \sa text, QDoubleSpinBox::prefix, QDoubleSpinBox::suffix
*/

QString QDoubleSpinBox::cleanText() const
{
    Q_D(const QDoubleSpinBox);

    return d->stripped(d->edit->displayText());
}

/*!
    \property QDoubleSpinBox::singleStep
    \brief the step value

    When the user uses the arrows to change the spin box's value the
    value will be incremented/decremented by the amount of the
    singleStep. The default value is 1.0. Setting a singleStep value
    of less than 0 does nothing.
*/
double QDoubleSpinBox::singleStep() const
{
    Q_D(const QDoubleSpinBox);

    return d->singleStep.toDouble();
}

void QDoubleSpinBox::setSingleStep(double value)
{
    Q_D(QDoubleSpinBox);

    if (value >= 0) {
        d->singleStep = value;
        d->updateEdit();
    }
}

/*!
    \property QDoubleSpinBox::minimum

    \brief the minimum value of the spin box

    When setting this property the \l maximum is adjusted
    if necessary to ensure that the range remains valid.

    The default minimum value is 0.0.

    Note: The minimum value will be rounded to match the decimals
    property.

    \sa decimals, setRange() specialValueText
*/

double QDoubleSpinBox::minimum() const
{
    Q_D(const QDoubleSpinBox);

    return d->minimum.toDouble();
}

void QDoubleSpinBox::setMinimum(double minimum)
{
    Q_D(QDoubleSpinBox);
    const QVariant m(d->round(minimum));
    d->setRange(m, (d->variantCompare(d->maximum, m) > 0 ? d->maximum : m));
}

/*!
    \property QDoubleSpinBox::maximum

    \brief the maximum value of the spin box

    When setting this property the \l minimum is adjusted
    if necessary, to ensure that the range remains valid.

    The default maximum value is 99.99.

    Note: The maximum value will be rounded to match the decimals
    property.

    \sa decimals, setRange()
*/

double QDoubleSpinBox::maximum() const
{
    Q_D(const QDoubleSpinBox);

    return d->maximum.toDouble();
}

void QDoubleSpinBox::setMaximum(double maximum)
{
    Q_D(QDoubleSpinBox);
    const QVariant m(d->round(maximum));
    d->setRange((d->variantCompare(d->minimum, m) < 0 ? d->minimum : m), m);
}

/*!
    Convenience function to set the \a minimum and \a maximum values
    with a single function call.

    Note: The maximum and minimum values will be rounded to match the
    decimals property.

    \code
    setRange(minimum, maximum);
    \endcode
    is equivalent to:
    \code
    setMinimum(minimum);
    setMaximum(maximum);
    \endcode

    \sa minimum maximum
*/

void QDoubleSpinBox::setRange(double minimum, double maximum)
{
    Q_D(QDoubleSpinBox);
    d->setRange(QVariant(d->round(minimum)), QVariant(d->round(maximum)));
}

/*!
     \property QDoubleSpinBox::decimals

     \brief the precision of the spin box, in decimals

     Sets how many decimals the spinbox will use for displaying and
     interpreting doubles.

     \warning The results might not be reliable with very high values
     for \a decimals.

     Note: The maximum, minimum and value might change as a result of
     changing this property.
*/

int QDoubleSpinBox::decimals() const
{
    Q_D(const QDoubleSpinBox);

    return d->decimals;
}

void QDoubleSpinBox::setDecimals(int decimals)
{
    Q_D(QDoubleSpinBox);
    d->decimals = qMax(0, decimals);

    setRange(minimum(), maximum()); // make sure values are rounded
    setValue(value());
}

/*!
    This virtual function is used by the spin box whenever it needs to
    display the given \a value. The default implementation returns a string
    containing \a value printed using QLocale().toString(\a value,
    QLatin1Char('f'), decimals()) and will remove the thousand
    separator. Reimplementations may return anything.

    Note: QDoubleSpinBox does not call this function for
    specialValueText() and that neither prefix() nor suffix() should
    be included in the return value.

    If you reimplement this, you may also need to reimplement
    valueFromText().

    \sa valueFromText()
*/


QString QDoubleSpinBox::textFromValue(double value) const
{
    Q_D(const QDoubleSpinBox);
    QString str = QLocale().toString(value, 'f', d->decimals);
    if (qAbs(value) >= 1000.0) {
        str.remove(d->thousand);
    }
    return str;
}

/*!
    This virtual function is used by the spin box whenever it needs to
    interpret \a text entered by the user as a value.

    Subclasses that need to display spin box values in a non-numeric
    way need to reimplement this function.

    Note: QDoubleSpinBox handles specialValueText() separately; this
    function is only concerned with the other values.

    \sa textFromValue(), validate()
*/
double QDoubleSpinBox::valueFromText(const QString &text) const
{
    Q_D(const QDoubleSpinBox);

    QString copy = text;
    int pos = d->edit->cursorPosition();
    QValidator::State state = QValidator::Acceptable;
    return d->validateAndInterpret(copy, pos, state).toDouble();
}

/*!
  \reimp
*/
QValidator::State QDoubleSpinBox::validate(QString &text, int &pos) const
{
    Q_D(const QDoubleSpinBox);

    QValidator::State state;
    d->validateAndInterpret(text, pos, state);
    return state;
}


/*!
  \reimp
*/
void QDoubleSpinBox::fixup(QString &input) const
{
    Q_D(const QDoubleSpinBox);

    input.remove(d->thousand);
}

// --- QSpinBoxPrivate ---

/*!
    \internal
    Constructs a QSpinBoxPrivate object
*/

QSpinBoxPrivate::QSpinBoxPrivate()
{
    minimum = QVariant((int)0);
    maximum = QVariant((int)99);
    value = minimum;
    singleStep = QVariant((int)1);
    type = QVariant::Int;
    const QString str = QLocale().toString(4567);
    if (str.size() == 5) {
        thousand = QChar(str.at(1));
    }

}

/*!
    \internal
    \reimp
*/

void QSpinBoxPrivate::emitSignals(EmitPolicy ep, const QVariant &old)
{
    Q_Q(QSpinBox);
    if (ep != NeverEmit) {
        pendingEmit = false;
        if (ep == AlwaysEmit || value != old) {
            emit q->valueChanged(edit->displayText());
            emit q->valueChanged(value.toInt());
        }
    }
}

/*!
    \internal
    \reimp
*/

QString QSpinBoxPrivate::textFromValue(const QVariant &value) const
{
    Q_Q(const QSpinBox);
    return q->textFromValue(value.toInt());
}
/*!
    \internal
    \reimp
*/

QVariant QSpinBoxPrivate::valueFromText(const QString &text) const
{
    Q_Q(const QSpinBox);

    return QVariant(q->valueFromText(text));
}


/*!
  \internal

  Return true if str can become a number which is between minimum and
  maximum or false if this is not possible.
*/

bool QSpinBoxPrivate::isIntermediateValue(const QString &str) const
{
    const int num = QLocale().toInt(str, 0, 10);
    const int min = minimum.toInt();
    const int max = maximum.toInt();

    int numDigits = 0;
    int digits[10];
    int tmp = num;
    if (tmp == 0) {
        numDigits = 1;
        digits[0] = 0;
    } else {
        tmp = num;
        for (int i=0; tmp != 0; ++i) {
            digits[numDigits++] = qAbs(tmp % 10);
            tmp /= 10;
        }
    }

    int failures = 0;
    for (int number=min; /*number<=max*/; ++number) {
        tmp = number;
        for (int i=0; tmp != 0;) {
            if (digits[i] == qAbs(tmp % 10)) {
                if (++i == numDigits)
                    return true;
            }
            tmp /= 10;
        }
        if (failures++ == 500000) //upper bound
            return true;