QSpinBox

The QSpinBox class provides a spin box widget. More

Inheritance diagram of PySide2.QtWidgets.QSpinBox

Synopsis

Functions

Virtual functions

Slots

Signals

Detailed Description

../../_images/windows-spinbox.png

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 two valueChanged() signals, one providing an int and the other a QString . The QString overload provides the value with both prefix() and suffix() . 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 .

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”):

def valueFromText(self, text):
    regExp = QRegExp(tr("(\\d+)(\\s*[xx]\\s*\\d+)?"))

    if regExp.exactMatch(text):
        return regExp.cap(1).toInt()
    else:
        return 0

def textFromValue(self, value):
    return self.tr("%1 x %1").arg(value)

See the Icons example for the full source code.

See also

QDoubleSpinBox QDateTimeEdit QSlider Spin Boxes Example

class QSpinBox([parent=None])
param parent

QWidget

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 parent .

PySide2.QtWidgets.QSpinBox.cleanText()
Return type

unicode

PySide2.QtWidgets.QSpinBox.displayIntegerBase()
Return type

int

PySide2.QtWidgets.QSpinBox.maximum()
Return type

int

See also

setMaximum()

PySide2.QtWidgets.QSpinBox.minimum()
Return type

int

See also

setMinimum()

PySide2.QtWidgets.QSpinBox.prefix()
Return type

unicode

See also

setPrefix()

PySide2.QtWidgets.QSpinBox.setDisplayIntegerBase(base)
Parameters

baseint

PySide2.QtWidgets.QSpinBox.setMaximum(max)
Parameters

maxint

See also

maximum()

PySide2.QtWidgets.QSpinBox.setMinimum(min)
Parameters

minint

See also

minimum()

PySide2.QtWidgets.QSpinBox.setPrefix(prefix)
Parameters

prefix – unicode

See also

prefix()

PySide2.QtWidgets.QSpinBox.setRange(min, max)
Parameters
  • minint

  • maxint

Convenience function to set the minimum , and maximum values with a single function call.

setRange(minimum, maximum)

is equivalent to:

setMinimum(minimum)
setMaximum(maximum)

See also

minimum maximum

PySide2.QtWidgets.QSpinBox.setSingleStep(val)
Parameters

valint

See also

singleStep()

PySide2.QtWidgets.QSpinBox.setStepType(stepType)
Parameters

stepTypeStepType

Sets the step type for the spin box to stepType , which is single step or adaptive decimal step.

Adaptive decimal step means that the step size will continuously be adjusted to one power of ten below the current value . So when the value is 1100, the step is set to 100, so stepping up once increases it to 1200. For 1200 stepping up takes it to 1300. For negative values, stepping down from -1100 goes to -1200.

Step direction is taken into account to handle edges cases, so that stepping down from 100 takes the value to 99 instead of 90. Thus a step up followed by a step down – or vice versa – always lands on the starting value; 99 -> 100 -> 99.

Setting this will cause the spin box to disregard the value of singleStep , although it is preserved so that singleStep comes into effect if adaptive decimal step is later turned off.

See also

stepType()

PySide2.QtWidgets.QSpinBox.setSuffix(suffix)
Parameters

suffix – unicode

See also

suffix()

PySide2.QtWidgets.QSpinBox.setValue(val)
Parameters

valint

See also

value()

PySide2.QtWidgets.QSpinBox.singleStep()
Return type

int

See also

setSingleStep()

PySide2.QtWidgets.QSpinBox.stepType()
Return type

StepType

See also

setStepType()

PySide2.QtWidgets.QSpinBox.suffix()
Return type

unicode

See also

setSuffix()

PySide2.QtWidgets.QSpinBox.textFromValue(val)
Parameters

valint

Return type

unicode

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 in the standard way using locale() .toString(), but with the thousand separator removed unless setGroupSeparatorShown() is set. 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()

See also

valueFromText() validate() groupSeparator()

PySide2.QtWidgets.QSpinBox.value()
Return type

int

See also

setValue()

PySide2.QtWidgets.QSpinBox.valueChanged(arg__1)
Parameters

arg__1 – unicode

def callback_unicode(value_as_unicode):
    print 'unicode value changed:', repr(value_as_unicode)

app = QApplication(sys.argv)
spinbox = QSpinBox()
spinbox.valueChanged[unicode].connect(callback_unicode)
spinbox.show()
sys.exit(app.exec_())
PySide2.QtWidgets.QSpinBox.valueChanged(arg__1)
Parameters

arg__1int

def callback_int(value_as_int):
    print 'int value changed:', repr(value_as_int)

app = QApplication(sys.argv)
spinbox = QSpinBox()
spinbox.valueChanged[unicode].connect(callback_unicode)
spinbox.show()
sys.exit(app.exec_())
PySide2.QtWidgets.QSpinBox.valueFromText(text)
Parameters

text – unicode

Return type

int

This virtual function is used by the spin box whenever it needs to interpret 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: QSpinBox handles specialValueText() separately; this function is only concerned with the other values.

See also

textFromValue() validate()