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QDoubleSpinBox Class Reference
^{^{[QtGui module]}}

The QDoubleSpinBox class provides a spin box widget that takes doubles. More...

Inherits QAbstractSpinBox.

Methods

__init__ (self, QWidget parent = None)
QString cleanText (self)
int decimals (self)
QString str fixup (self, QString str)
fixup (self, QString str)
float maximum (self)
float minimum (self)
QString prefix (self)
setDecimals (self, int prec)
setMaximum (self, float max)
setMinimum (self, float min)
setPrefix (self, QString p)
setRange (self, float min, float max)
setSingleStep (self, float val)
setSuffix (self, QString s)
setValue (self, float val)
float singleStep (self)
QString suffix (self)
QString textFromValue (self, float v)
(QValidator.State, QString input, int pos) validate (self, QString input, int pos)
(QValidator.State, int pos) validate (self, QString input, int pos)
float value (self)
float valueFromText (self, QString text)

Qt Signals

void valueChanged (double)
void valueChanged (const QString&)

Detailed Description

The QDoubleSpinBox class provides a spin box widget that takes doubles.

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.

Method Documentation

QDoubleSpinBox.init (self, QWidget parent = None)

The parent argument, if not None, causes self to be owned by Qt instead of PyQt.

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 parent.

See also setMinimum(), setMaximum(), and setSingleStep().

 setRange(minimum, maximum);

is equivalent to:

 setMinimum(minimum);
 setMaximum(maximum);

See also minimum and maximum.

This virtual function is used by the spin box whenever it needs to display the given value. The default implementation returns a string containing value printed using QWidget.locale().toString(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().

See also valueFromText() and QLocale.groupSeparator().