use std::sync::Arc; use gpui::{AnyElement, AnyView, ClickEvent, MouseButton, MouseDownEvent}; use crate::{Disclosure, prelude::*}; #[derive(IntoElement, RegisterComponent)]pub struct TreeViewItem {    id: ElementId,    group_name: Option<SharedString>,    label: SharedString,    expanded: bool,    selected: bool,    disabled: bool,    focused: bool,    default_expanded: bool,    root_item: bool,    tooltip: Option<Box<dyn Fn(&mut Window, &mut App) -> AnyView + 'static>>,    on_click: Option<Box<dyn Fn(&ClickEvent, &mut Window, &mut App) + 'static>>,    on_hover: Option<Box<dyn Fn(&bool, &mut Window, &mut App) + 'static>>,    on_toggle: Option<Arc<dyn Fn(&ClickEvent, &mut Window, &mut App) + 'static>>,    on_secondary_mouse_down: Option<Box<dyn Fn(&MouseDownEvent, &mut Window, &mut App) + 'static>>,    tab_index: Option<isize>,    focus_handle: Option<gpui::FocusHandle>,} impl TreeViewItem {    pub fn new(id: impl Into<ElementId>, label: impl Into<SharedString>) -> Self {        Self {            id: id.into(),            group_name: None,            label: label.into(),            expanded: false,            selected: false,            disabled: false,            focused: false,            default_expanded: false,            root_item: false,            tooltip: None,            on_click: None,            on_hover: None,            on_toggle: None,            on_secondary_mouse_down: None,            tab_index: None,            focus_handle: None,        }    }     pub fn group_name(mut self, group_name: impl Into<SharedString>) -> Self {        self.group_name = Some(group_name.into());        self    }     pub fn on_click(        mut self,        handler: impl Fn(&ClickEvent, &mut Window, &mut App) + 'static,    ) -> Self {        self.on_click = Some(Box::new(handler));        self    }     pub fn on_hover(mut self, handler: impl Fn(&bool, &mut Window, &mut App) + 'static) -> Self {        self.on_hover = Some(Box::new(handler));        self    }     pub fn on_secondary_mouse_down(        mut self,        handler: impl Fn(&MouseDownEvent, &mut Window, &mut App) + 'static,    ) -> Self {        self.on_secondary_mouse_down = Some(Box::new(handler));        self    }     pub fn tooltip(mut self, tooltip: impl Fn(&mut Window, &mut App) -> AnyView + 'static) -> Self {        self.tooltip = Some(Box::new(tooltip));        self    }     pub fn tab_index(mut self, tab_index: isize) -> Self {        self.tab_index = Some(tab_index);        self    }     pub fn expanded(mut self, toggle: bool) -> Self {        self.expanded = toggle;        self    }     pub fn default_expanded(mut self, default_expanded: bool) -> Self {        self.default_expanded = default_expanded;        self    }     pub fn on_toggle(        mut self,        on_toggle: impl Fn(&ClickEvent, &mut Window, &mut App) + 'static,    ) -> Self {        self.on_toggle = Some(Arc::new(on_toggle));        self    }     pub fn root_item(mut self, root_item: bool) -> Self {        self.root_item = root_item;        self    }     pub fn focused(mut self, focused: bool) -> Self {        self.focused = focused;        self    }     pub fn track_focus(mut self, focus_handle: &gpui::FocusHandle) -> Self {        self.focus_handle = Some(focus_handle.clone());        self    }} impl Disableable for TreeViewItem {    fn disabled(mut self, disabled: bool) -> Self {        self.disabled = disabled;        self    }} impl Toggleable for TreeViewItem {    fn toggle_state(mut self, selected: bool) -> Self {        self.selected = selected;        self    }} impl RenderOnce for TreeViewItem {    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {        let selected_bg = cx.theme().colors().element_active.opacity(0.5);         let transparent_border = cx.theme().colors().border.opacity(0.);        let selected_border = cx.theme().colors().border.opacity(0.4);        let focused_border = cx.theme().colors().border_focused;         let item_size = rems_from_px(28.);        let indentation_line = h_flex().size(item_size).flex_none().justify_center().child(            div()                .w_px()                .h_full()                .bg(cx.theme().colors().border.opacity(0.5)),        );         h_flex()            .id(self.id)            .when_some(self.group_name, |this, group| this.group(group))            .w_full()            .child(                h_flex()                    .id("inner_tree_view_item")                    .cursor_pointer()                    .size_full()                    .h(item_size)                    .rounded_sm()                    .border_1()                    .border_color(transparent_border)                    .focus_visible(|s| s.border_color(focused_border))                    .when(self.selected, |this| {                        this.border_color(selected_border).bg(selected_bg)                    })                    .hover(|s| s.bg(cx.theme().colors().element_hover))                    .map(|this| {                        let label = self.label;                         if self.root_item {                            this.px_1()                                .gap_2p5()                                .child(                                    Disclosure::new("toggle", self.expanded)                                        .when_some(                                            self.on_toggle.clone(),                                            |disclosure, on_toggle| {                                                disclosure.on_toggle_expanded(on_toggle)                                            },                                        )                                        .opened_icon(IconName::ChevronDown)                                        .closed_icon(IconName::ChevronRight),                                )                                .child(                                    Label::new(label)                                        .when(!self.selected, |this| this.color(Color::Muted)),                                )                        } else {                            this.child(indentation_line).child(                                h_flex()                                    .id("nested_inner_tree_view_item")                                    .w_full()                                    .flex_grow()                                    .px_1()                                    .child(                                        Label::new(label)                                            .when(!self.selected, |this| this.color(Color::Muted)),                                    ),                            )                        }                    })                    .when_some(self.focus_handle, |this, handle| this.track_focus(&handle))                    .when_some(self.tab_index, |this, index| this.tab_index(index))                    .when_some(self.on_hover, |this, on_hover| this.on_hover(on_hover))                    .when_some(                        self.on_click.filter(|_| !self.disabled),                        |this, on_click| this.on_click(on_click),                    )                    .when_some(self.on_secondary_mouse_down, |this, on_mouse_down| {                        this.on_mouse_down(MouseButton::Right, move |event, window, cx| {                            (on_mouse_down)(event, window, cx)                        })                    })                    .when_some(self.tooltip, |this, tooltip| this.tooltip(tooltip)),            )    }} impl Component for TreeViewItem {    fn scope() -> ComponentScope {        ComponentScope::Navigation    }     fn description() -> Option<&'static str> {        Some(            "A hierarchical list of items that may have a parent-child relationship where children can be toggled into view by expanding or collapsing their parent item.",        )    }     fn preview(_window: &mut Window, cx: &mut App) -> Option<AnyElement> {        let container = || {            v_flex()                .p_2()                .w_64()                .border_1()                .border_color(cx.theme().colors().border_variant)                .bg(cx.theme().colors().panel_background)        };         Some(            example_group(vec![                single_example(                    "Basic Tree View",                    container()                        .child(                            TreeViewItem::new("index-1", "Tree Item Root #1")                                .root_item(true)                                .toggle_state(true),                        )                        .child(TreeViewItem::new("index-2", "Tree Item #2"))                        .child(TreeViewItem::new("index-3", "Tree Item #3"))                        .child(TreeViewItem::new("index-4", "Tree Item Root #2").root_item(true))                        .child(TreeViewItem::new("index-5", "Tree Item #5"))                        .child(TreeViewItem::new("index-6", "Tree Item #6"))                        .into_any_element(),                ),                single_example(                    "Active Child",                    container()                        .child(TreeViewItem::new("index-1", "Tree Item Root #1").root_item(true))                        .child(TreeViewItem::new("index-2", "Tree Item #2").toggle_state(true))                        .child(TreeViewItem::new("index-3", "Tree Item #3"))                        .into_any_element(),                ),                single_example(                    "Focused Parent",                    container()                        .child(                            TreeViewItem::new("index-1", "Tree Item Root #1")                                .root_item(true)                                .focused(true)                                .toggle_state(true),                        )                        .child(TreeViewItem::new("index-2", "Tree Item #2"))                        .child(TreeViewItem::new("index-3", "Tree Item #3"))                        .into_any_element(),                ),                single_example(                    "Focused Child",                    container()                        .child(                            TreeViewItem::new("index-1", "Tree Item Root #1")                                .root_item(true)                                .toggle_state(true),                        )                        .child(TreeViewItem::new("index-2", "Tree Item #2").focused(true))                        .child(TreeViewItem::new("index-3", "Tree Item #3"))                        .into_any_element(),                ),            ])            .into_any_element(),        )    }}