Function bindMapKey

core/keyedlist.go:230–268

bindMapKey is a version of [Bind] that works for keys in a map.

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

// bindMapKey is a version of [Bind] that works for keys in a map.
func bindMapKey[T Value](mapv reflect.Value, key reflect.Value, vw T) T {
	wb := vw.AsWidget()
	alreadyBound := wb.ValueUpdate != nil
	wb.ValueUpdate = func() {
		if vws, ok := any(vw).(ValueSetter); ok {
			ErrorSnackbar(vw, vws.SetWidgetValue(key.Interface()))
		} else {
			ErrorSnackbar(vw, reflectx.SetRobust(vw.WidgetValue(), key.Interface()))
		}
	}
	wb.ValueOnChange = func() {
		newKey := reflect.New(key.Type())
		ErrorSnackbar(vw, reflectx.SetRobust(newKey.Interface(), vw.WidgetValue()))
		newKey = newKey.Elem()
		if !mapv.MapIndex(newKey).IsValid() { // not already taken
			mapv.SetMapIndex(newKey, mapv.MapIndex(key))
			mapv.SetMapIndex(key, reflect.Value{})
			return
		}
		d := NewBody().AddTitle("Key already exists").AddText(fmt.Sprintf("The key %q already exists", reflectx.ToString(newKey.Interface())))
		d.AddBottomBar(func(parent Widget) {
			d.AddCancel(parent)
			d.AddOK(parent).SetText("Overwrite").OnClick(func(e events.Event) {
				mapv.SetMapIndex(newKey, mapv.MapIndex(key))
				mapv.SetMapIndex(key, reflect.Value{})
				wb.SendChange()
			})
		})
		d.RunDialog(vw)
	}
	if alreadyBound {
		ResetWidgetValue(vw)
	}
	if ob, ok := any(vw).(OnBinder); ok {
		ob.OnBind(key.Interface(), "")
	}
	wb.ValueUpdate() // we update it with the initial value immediately
	return vw
}

// 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 {