zng::widget::node

Function with_index_len_node

source 
pub fn with_index_len_node(
    child: impl UiNode,
    panel_list_id: impl Into<StateId<PanelListRange>>,
    update: impl FnMut(Option<(usize, usize)>) + Send + 'static,
) -> impl UiNode
Expand description

Helper for a property that gets the index of the widget in the parent panel and the number of children.

Panels must use PanelList::track_info_range to collect the panel_list_id, then implement getter properties using the methods in this module. See the stack! getter properties for examples.