source: trunk/src/gui/widgets/qspinbox.cpp@ 324

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#include <private/qabstractspinbox_p.h>
#include <qspinbox.h>

#ifndef QT_NO_SPINBOX

#include <qlineedit.h>
#include <qlocale.h>
#include <qvalidator.h>
#include <qdebug.h>

#include <math.h>

QT_BEGIN_NAMESPACE

//#define QSPINBOX_QSBDEBUG
#ifdef QSPINBOX_QSBDEBUG
#  define QSBDEBUG qDebug
#else
#  define QSBDEBUG if (false) qDebug
#endif

static bool isIntermediateValueHelper(qint64 num, qint64 minimum, qint64 maximum, qint64 *match = 0);

class QSpinBoxPrivate : public QAbstractSpinBoxPrivate
{
    Q_DECLARE_PUBLIC(QSpinBox)
public:
    QSpinBoxPrivate(QWidget *parent = 0);
    void emitSignals(EmitPolicy ep, const QVariant &);

    virtual QVariant valueFromText(const QString &n) const;
    virtual QString textFromValue(const QVariant &n) const;
    QVariant validateAndInterpret(QString &input, int &pos,
                                  QValidator::State &state) const;
    bool isIntermediateValue(const QString &str) const;
    QChar thousand;

    inline void init() {
        setLayoutItemMargins(QStyle::SE_SpinBoxLayoutItem);
    }
};

class QDoubleSpinBoxPrivate : public QAbstractSpinBoxPrivate
{
    Q_DECLARE_PUBLIC(QDoubleSpinBox)
public:
    QDoubleSpinBoxPrivate(QWidget *parent = 0);
    void emitSignals(EmitPolicy ep, const QVariant &);
    bool isIntermediateValue(const QString &str) const;

    virtual QVariant valueFromText(const QString &n) const;
    virtual QString textFromValue(const QVariant &n) const;
    QVariant validateAndInterpret(QString &input, int &pos,
                                  QValidator::State &state) const;
    double round(double input) const;
    // variables
    int decimals;
    QChar delimiter, thousand;
};


/*!
    \class QSpinBox
    \brief The QSpinBox class provides a spin box widget.

    \ingroup basicwidgets
    \mainclass

    QSpinBox is designed to handle integers and discrete sets of
    values (e.g., month names); use QDoubleSpinBox for floating point
    values.

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

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

    Clicking the up/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 behaviour 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().

    Most spin boxes are directional, but QSpinBox can also operate as
    a circular spin box, i.e. if the range is 0-99 and the current
    value is 99, 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 QSpinBox.

    \table 100%
    \row \o \inlineimage windowsxp-spinbox.png Screenshot of a Windows XP spin box
         \o A spin box shown in the \l{Windows XP Style Widget Gallery}{Windows XP widget style}.
    \row \o \inlineimage plastique-spinbox.png Screenshot of a Plastique spin box
         \o A spin box shown in the \l{Plastique Style Widget Gallery}{Plastique widget style}.
    \row \o \inlineimage macintosh-spinbox.png Screenshot of a Macintosh spin box
         \o A spin box shown in the \l{Macintosh Style Widget Gallery}{Macintosh widget style}.
    \endtable

    \section1 Subclassing QSpinBox

    If using prefix(), suffix(), and specialValueText() don't provide
    enough control, you subclass QSpinBox and reimplement
    valueFromText() and textFromValue(). For example, here's the code
    for a custom spin box that allows the user to enter icon sizes
    (e.g., "32 x 32"):

    \snippet examples/widgets/icons/iconsizespinbox.cpp 1
    \codeline
    \snippet examples/widgets/icons/iconsizespinbox.cpp 2

    See the \l{widgets/icons}{Icons} example for the full source
    code.

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

/*!
    \fn void QSpinBox::valueChanged(int i)

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

/*!
    \fn void QSpinBox::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 as minimum value and 99 as maximum value, a
    step value of 1. The value is initially set to 0. It is parented to \a
    parent.

    \sa setMinimum(), setMaximum(), setSingleStep()
*/

QSpinBox::QSpinBox(QWidget *parent)
    : QAbstractSpinBox(*new QSpinBoxPrivate(parent), parent)
{
    Q_D(QSpinBox);
    d->init();
}

#ifdef QT3_SUPPORT
/*!
    Use one of the constructors that doesn't take the \a name
    argument and then use setObjectName() instead.
*/
QSpinBox::QSpinBox(QWidget *parent, const char *name)
    : QAbstractSpinBox(*new QSpinBoxPrivate(parent), parent)
{
    Q_D(QSpinBox);
    setObjectName(QString::fromAscii(name));
    d->init();
}

/*!
    Use one of the constructors that doesn't take the \a name
    argument and then use setObjectName() instead.
*/
QSpinBox::QSpinBox(int minimum, int maximum, int step, QWidget *parent, const char *name)
    : QAbstractSpinBox(*new QSpinBoxPrivate(parent), parent)
{
    Q_D(QSpinBox);
    d->minimum = QVariant(qMin<int>(minimum, maximum));
    d->maximum = QVariant(qMax<int>(minimum, maximum));
    d->singleStep = QVariant(step);
    setObjectName(QString::fromAscii(name));
    d->init();
}

#endif

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

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

int QSpinBox::value() const
{
    Q_D(const QSpinBox);
    return d->value.toInt();
}

void QSpinBox::setValue(int value)
{
    Q_D(QSpinBox);
    d->setValue(QVariant(value), EmitIfChanged);
}

/*!
    \property QSpinBox::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:

    \snippet doc/src/snippets/code/src_gui_widgets_qspinbox.cpp 0

    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 QSpinBox::prefix() const
{
    Q_D(const QSpinBox);
    return d->prefix;
}

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

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

/*!
    \property QSpinBox::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:

    \snippet doc/src/snippets/code/src_gui_widgets_qspinbox.cpp 1

    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 QSpinBox::suffix() const
{
    Q_D(const QSpinBox);

    return d->suffix;
}

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

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

/*!
    \property QSpinBox::cleanText

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

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

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

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


/*!
    \property QSpinBox::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. Setting a singleStep value of
    less than 0 does nothing.
*/

int QSpinBox::singleStep() const
{
    Q_D(const QSpinBox);

    return d->singleStep.toInt();
}

void QSpinBox::setSingleStep(int value)
{
    Q_D(QSpinBox);
    if (value >= 0) {
        d->singleStep = QVariant(value);
        d->updateEdit();
    }
}

/*!
    \property QSpinBox::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.

    \sa setRange()  specialValueText
*/

int QSpinBox::minimum() const
{
    Q_D(const QSpinBox);

    return d->minimum.toInt();
}

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

/*!
    \property QSpinBox::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.

    \sa setRange() specialValueText

*/

int QSpinBox::maximum() const
{
    Q_D(const QSpinBox);

    return d->maximum.toInt();
}

void QSpinBox::setMaximum(int maximum)
{
    Q_D(QSpinBox);
    const QVariant m(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.

    \snippet doc/src/snippets/code/src_gui_widgets_qspinbox.cpp 2
    is equivalent to:
    \snippet doc/src/snippets/code/src_gui_widgets_qspinbox.cpp 3

    \sa minimum maximum
*/

void QSpinBox::setRange(int minimum, int maximum)
{
    Q_D(QSpinBox);
    d->setRange(QVariant(minimum), QVariant(maximum));
}

/*!
    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 in the standard way using
    QWidget::locale().toString(). Reimplementations may return anything. (See
    the example in the detailed description.)

    Note: QSpinBox 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() and validate()

    \sa valueFromText(), validate()
*/

QString QSpinBox::textFromValue(int value) const