use std::sync::Arc; use gpui::{ClickEvent, CursorStyle}; use crate::{prelude::*, Color, IconButton, IconButtonShape, IconName, IconSize}; #[derive(IntoElement)]pub struct Disclosure {    id: ElementId,    is_open: bool,    selected: bool,    on_toggle: Option<Arc<dyn Fn(&ClickEvent, &mut Window, &mut App) + 'static>>,    cursor_style: CursorStyle,} impl Disclosure {    pub fn new(id: impl Into<ElementId>, is_open: bool) -> Self {        Self {            id: id.into(),            is_open,            selected: false,            on_toggle: None,            cursor_style: CursorStyle::PointingHand,        }    }     pub fn on_toggle(        mut self,        handler: impl Into<Option<Arc<dyn Fn(&ClickEvent, &mut Window, &mut App) + 'static>>>,    ) -> Self {        self.on_toggle = handler.into();        self    }} impl Toggleable for Disclosure {    fn toggle_state(mut self, selected: bool) -> Self {        self.selected = selected;        self    }} impl Clickable for Disclosure {    fn on_click(mut self, handler: impl Fn(&ClickEvent, &mut Window, &mut App) + 'static) -> Self {        self.on_toggle = Some(Arc::new(handler));        self    }     fn cursor_style(mut self, cursor_style: gpui::CursorStyle) -> Self {        self.cursor_style = cursor_style;        self    }} impl RenderOnce for Disclosure {    fn render(self, _window: &mut Window, _cx: &mut App) -> impl IntoElement {        IconButton::new(            self.id,            match self.is_open {                true => IconName::ChevronDown,                false => IconName::ChevronRight,            },        )        .shape(IconButtonShape::Square)        .icon_color(Color::Muted)        .icon_size(IconSize::Small)        .toggle_state(self.selected)        .when_some(self.on_toggle, move |this, on_toggle| {            this.on_click(move |event, window, cx| on_toggle(event, window, cx))        })    }}