Function bindMapValue

core/keyedlist.go:271–296

bindMapValue is a version of [Bind] that works for values in a map.

(mapv reflect.Value, key reflect.Value, vw T)

// bindMapValue is a version of [Bind] that works for values in a map.
func bindMapValue[T Value](mapv reflect.Value, key reflect.Value, vw T) T {
	wb := vw.AsWidget()
	alreadyBound := wb.ValueUpdate != nil
	wb.ValueUpdate = func() {
		value := mapv.MapIndex(key).Interface()
		if vws, ok := any(vw).(ValueSetter); ok {
			ErrorSnackbar(vw, vws.SetWidgetValue(value))
		} else {
			ErrorSnackbar(vw, reflectx.SetRobust(vw.WidgetValue(), value))
		}
	}
	wb.ValueOnChange = func() {
		value := reflect.New(mapv.Type().Elem())
		ErrorSnackbar(vw, reflectx.SetRobust(value.Interface(), vw.WidgetValue()))
		mapv.SetMapIndex(key, value.Elem())
	}
	if alreadyBound {
		ResetWidgetValue(vw)
	}
	if ob, ok := any(vw).(OnBinder); ok {
		value := mapv.MapIndex(key).Interface()
		ob.OnBind(value, "")
	}
	wb.ValueUpdate() // we update it with the initial value immediately
	return vw
}