Picker

Gova has two picker variants: a simple string picker and a generic typed picker.

func Picker(options []string, selected int) *viewNode
func (n *viewNode) OnPickerChange(fn func(string)) *viewNode

choice := gova.State(s, 0)
 
gova.Picker([]string{"Low", "Medium", "High"}, choice.Get()).
    OnPickerChange(func(s string) {
        switch s {
        case "Low":
            choice.Set(0)
        case "Medium":
            choice.Set(1)
        case "High":
            choice.Set(2)
        }
    })

The selected argument is the initial index. OnPickerChange fires with the newly selected string when the user changes selection.

PickerOf

func PickerOf[T comparable](
    state *StateValue[T],
    options []T,
    label func(T) string,
) *viewNode

PickerOf is a typed wrapper that binds to a state of any comparable type. It renders the options with label(o) and writes the selected option back to state.

type Priority int
const (
    Low Priority = iota
    Medium
    High
)
 
func (p Priority) String() string {
    return [...]string{"Low", "Medium", "High"}[p]
}
 
priority := gova.State(s, Medium)
 
gova.PickerOf(priority, []Priority{Low, Medium, High}, func(p Priority) string {
    return p.String()
})

If the current state value is not in options, the first option is selected and written back.

Picker

Picker

PickerOf

On this page