NumberInput#

A text input that is limited to numeric input.

../../../_images/numberinput-cocoa.png

Usage#

import toga

widget = toga.NumberInput(min_value=1, max_value=10, step=0.001)
widget.value = 2.718

NumberInput’s properties can accept integers, floats, and strings containing numbers, but they always return decimal.Decimal objects to ensure precision is retained.

Reference#

class toga.NumberInput(id=None, style=None, step=1, min=None, max=None, value=None, readonly=False, on_change=None, min_value=None, max_value=None)#

Bases: Widget

Create a new number input widget.

Parameters:

  • id – The ID for the widget.

  • style – A style object. If no style is provided, a default style will be applied to the widget.

  • step (Decimal) – The amount that any increment/decrement operations will apply to the widget’s current value.

  • min (Decimal | None) – If provided, value will be guaranteed to be greater than or equal to this minimum.

  • max (Decimal | None) – If provided, value will be guaranteed to be less than or equal to this maximum.

  • value (Decimal | None) – The initial value for the widget.

  • readonly (bool) – Can the value of the widget be modified by the user?

  • on_change (callable | None) – A handler that will be invoked when the the value of the widget changes.

  • min_value (Decimal | None) – DEPRECATED; alias of min.

  • max_value (Decimal | None) – DEPRECATED; alias of max.

property max: Decimal | None#

The maximum bound for the widget’s value.

Returns None if there is no maximum bound.

When setting this property, the current value and min will be clipped against the new maximum value.

property max_value: Decimal | None#

DEPRECATED; alias of max.

property min: Decimal | None#

The minimum bound for the widget’s value.

Returns None if there is no minimum bound.

When setting this property, the current value and max will be clipped against the new minimum value.

property min_value: Decimal | None#

DEPRECATED; alias of min.

property on_change: callable#

The handler to invoke when the value of the widget changes.

property readonly: bool#

Can the value of the widget be modified by the user?

This only controls manual changes by the user (i.e., typing at the keyboard). Programmatic changes are permitted while the widget has readonly enabled.

property step: Decimal#

The amount that any increment/decrement operations will apply to the widget’s current value. (Not all backends provide increment and decrement buttons.)

property value: Decimal | None#

Current value of the widget, rounded to the same number of decimal places as step, or None if no value has been set.

If this property is set to a value outside of the min/max range, it will be clipped.

While the widget is being edited by the user, it is possible for the UI to contain a value which is outside of the min/max range, or has too many decimal places. In this case, this property will return a value that has been clipped and rounded, and the visible text will be updated to match as soon as the widget loses focus.