Function visibility 

pub fn visibility(
    child: impl IntoUiNode,
    visibility: impl IntoVar<Visibility>,
) -> UiNode

P Sets the widget visibility.

This property causes the widget to have the visibility, the widget actual visibility is computed, for example, widgets that don’t render anything are considered Hidden even if the visibility property is not set, this property only forces the widget to layout and render according to the specified visibility.

To probe the visibility state of a widget in when clauses use is_visible, is_hidden or is_collapsed, to probe a widget state use WidgetInfo::visibility.