Spinner

A spinner is a text field designed for numeric input (core.Spinner). It automatically supports the parsing and validation of input, in addition to convenient incrementing and decrementing. It provides more precise and less visual input than a slider.

Properties

You can make a spinner without any custom options:

core.NewSpinner(b)

You can set the value of a spinner:

core.NewSpinner(b).SetValue(12.7)

You can set the minimum and maximum values of a spinner:

core.NewSpinner(b).SetMin(-0.5).SetMax(2.7)

You can set the amount that the plus and minus buttons and up and down arrow keys change the value by:

core.NewSpinner(b).SetStep(6)

You can ensure that the value is always a multiple of the step:

core.NewSpinner(b).SetStep(4).SetEnforceStep(true)

You can make a spinner outlined instead of filled:

core.NewSpinner(b).SetType(core.TextFieldOutlined)

You can change the way that the value is formatted:

core.NewSpinner(b).SetFormat("%X").SetStep(1).SetValue(44)

Events

You can detect when a user changes the value of a spinner:

sp := core.NewSpinner(b)
sp.OnChange(func(e events.Event) {
    core.MessageSnackbar(b, fmt.Sprintf("Value changed to %g", sp.Value))
})