use gpui::{ClickEvent, Corner, CursorStyle, Entity, MouseButton}; use crate::{prelude::*, ContextMenu, PopoverMenu}; #[derive(IntoElement)]pub struct DropdownMenu {    id: ElementId,    label: SharedString,    menu: Entity<ContextMenu>,    full_width: bool,    disabled: bool,} impl DropdownMenu {    pub fn new(        id: impl Into<ElementId>,        label: impl Into<SharedString>,        menu: Entity<ContextMenu>,    ) -> Self {        Self {            id: id.into(),            label: label.into(),            menu,            full_width: false,            disabled: false,        }    }     pub fn full_width(mut self, full_width: bool) -> Self {        self.full_width = full_width;        self    }} impl Disableable for DropdownMenu {    fn disabled(mut self, disabled: bool) -> Self {        self.disabled = disabled;        self    }} impl RenderOnce for DropdownMenu {    fn render(self, _window: &mut Window, _cx: &mut App) -> impl IntoElement {        PopoverMenu::new(self.id)            .full_width(self.full_width)            .menu(move |_window, _cx| Some(self.menu.clone()))            .trigger(DropdownMenuTrigger::new(self.label).full_width(self.full_width))            .attach(Corner::BottomLeft)    }} #[derive(IntoElement)]struct DropdownMenuTrigger {    label: SharedString,    full_width: bool,    selected: bool,    disabled: bool,    cursor_style: CursorStyle,    on_click: Option<Box<dyn Fn(&ClickEvent, &mut Window, &mut App) + 'static>>,} impl DropdownMenuTrigger {    pub fn new(label: impl Into<SharedString>) -> Self {        Self {            label: label.into(),            full_width: false,            selected: false,            disabled: false,            cursor_style: CursorStyle::default(),            on_click: None,        }    }     pub fn full_width(mut self, full_width: bool) -> Self {        self.full_width = full_width;        self    }} impl Disableable for DropdownMenuTrigger {    fn disabled(mut self, disabled: bool) -> Self {        self.disabled = disabled;        self    }} impl Toggleable for DropdownMenuTrigger {    fn toggle_state(mut self, selected: bool) -> Self {        self.selected = selected;        self    }} impl Clickable for DropdownMenuTrigger {    fn on_click(mut self, handler: impl Fn(&ClickEvent, &mut Window, &mut App) + 'static) -> Self {        self.on_click = Some(Box::new(handler));        self    }     fn cursor_style(mut self, cursor_style: CursorStyle) -> Self {        self.cursor_style = cursor_style;        self    }} impl RenderOnce for DropdownMenuTrigger {    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {        let disabled = self.disabled;         h_flex()            .id("dropdown-menu-trigger")            .justify_between()            .rounded_sm()            .bg(cx.theme().colors().editor_background)            .pl_2()            .pr_1p5()            .py_0p5()            .gap_2()            .min_w_20()            .map(|el| {                if self.full_width {                    el.w_full()                } else {                    el.flex_none().w_auto()                }            })            .map(|el| {                if disabled {                    el.cursor_not_allowed()                } else {                    el.cursor_pointer()                }            })            .child(Label::new(self.label).color(if disabled {                Color::Disabled            } else {                Color::Default            }))            .child(                Icon::new(IconName::ChevronUpDown)                    .size(IconSize::XSmall)                    .color(if disabled {                        Color::Disabled                    } else {                        Color::Muted                    }),            )            .when_some(self.on_click.filter(|_| !disabled), |el, on_click| {                el.on_mouse_down(MouseButton::Left, |_, window, _| window.prevent_default())                    .on_click(move |event, window, cx| {                        cx.stop_propagation();                        (on_click)(event, window, cx)                    })            })    }}