use gpui::AnyElement;use smallvec::SmallVec; use crate::{prelude::*, v_flex, Label, ListHeader}; pub enum EmptyMessage {    Text(SharedString),    Element(AnyElement),} #[derive(IntoElement)]pub struct List {    /// Message to display when the list is empty    /// Defaults to "No items"    empty_message: EmptyMessage,    header: Option<ListHeader>,    toggle: Option<bool>,    children: SmallVec<[AnyElement; 2]>,} impl Default for List {    fn default() -> Self {        Self::new()    }} impl List {    pub fn new() -> Self {        Self {            empty_message: EmptyMessage::Text("No items".into()),            header: None,            toggle: None,            children: SmallVec::new(),        }    }     pub fn empty_message(mut self, message: impl Into<EmptyMessage>) -> Self {        self.empty_message = message.into();        self    }     pub fn header(mut self, header: impl Into<Option<ListHeader>>) -> Self {        self.header = header.into();        self    }     pub fn toggle(mut self, toggle: impl Into<Option<bool>>) -> Self {        self.toggle = toggle.into();        self    }} impl ParentElement for List {    fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {        self.children.extend(elements)    }} impl From<String> for EmptyMessage {    fn from(s: String) -> Self {        EmptyMessage::Text(SharedString::from(s))    }} impl From<&str> for EmptyMessage {    fn from(s: &str) -> Self {        EmptyMessage::Text(SharedString::from(s.to_owned()))    }} impl From<AnyElement> for EmptyMessage {    fn from(e: AnyElement) -> Self {        EmptyMessage::Element(e)    }} impl RenderOnce for List {    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {        v_flex()            .w_full()            .py(DynamicSpacing::Base04.rems(cx))            .children(self.header)            .map(|this| match (self.children.is_empty(), self.toggle) {                (false, _) => this.children(self.children),                (true, Some(false)) => this,                (true, _) => match self.empty_message {                    EmptyMessage::Text(text) => this.child(Label::new(text).color(Color::Muted)),                    EmptyMessage::Element(element) => this.child(element),                },            })    }}