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use std::{cell::Cell, rc::Rc};
use gpui::{
AnyElement, Bounds, Context, Entity, Pixels, Render, anchored, canvas, deferred, point,
};
use crate::TextInput;
use crate::prelude::*;
/// A typeahead-filtered select: a `TextInput` (typed filter) plus a
/// `DropdownMenu`-style popover list of options filtered by
/// **case-insensitive substring match** (no fuzzy-match / async / remote
/// data — out of scope per plan). Selecting an option sets the input's
/// display text via `TextInput::set_text`.
///
/// Stateful view — create with `cx.new(|cx| Combobox::new(cx, options))`.
pub struct Combobox {
options: Vec<SharedString>,
selected: Option<usize>,
open: bool,
input: Entity<TextInput>,
/// Real screen bounds of the trigger row, captured via an invisible
/// `canvas()` measurement child every render and read back on the
/// *next* render to position the floating option list. See
/// `Select::trigger_bounds` for the full rationale.
trigger_bounds: Rc<Cell<Option<Bounds<Pixels>>>>,
}
impl Combobox {
pub fn new(
cx: &mut Context<Self>,
options: impl IntoIterator<Item = impl Into<SharedString>>,
) -> Self {
let input = cx.new(|cx| TextInput::new(cx).placeholder("Search…"));
cx.observe(&input, |_, _, cx| cx.notify()).detach();
Self {
options: options.into_iter().map(Into::into).collect(),
selected: None,
open: false,
input,
trigger_bounds: Rc::new(Cell::new(None)),
}
}
/// The currently selected option, if any.
pub fn value(&self) -> Option<&SharedString> {
self.selected.and_then(|i| self.options.get(i))
}
/// Options matching the current filter text (case-insensitive substring).
fn filtered(&self, cx: &App) -> Vec<(usize, SharedString)> {
let query = self.input.read(cx).text().to_lowercase();
self.options
.iter()
.enumerate()
.filter(|(_, option)| query.is_empty() || option.to_lowercase().contains(&query))
.map(|(i, option)| (i, option.clone()))
.collect()
}
}
impl Render for Combobox {
fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
let open = self.open;
let filtered = self.filtered(cx);
let trigger = h_flex()
.id("combobox-trigger")
// Test-only (no-op in release builds, per `debug_selector`'s own
// doc comment): lets integration tests locate the trigger's real
// rendered pixel bounds via `VisualTestContext::debug_bounds`.
.debug_selector(|| "COMBOBOX-TRIGGER".into())
.w_full()
.items_center()
.justify_between()
.px_3()
.py_2()
.rounded_md()
.bg(semantic::surface(cx))
.border_1()
.border_color(if open {
palette::primary(500)
} else {
semantic::border(cx)
})
.child(div().flex_1().min_w_0().child(self.input.clone()))
.child(
div()
.id("combobox-toggle")
// Test-only (no-op in release builds): the actual click
// target for opening/closing the list — narrower than
// the whole trigger row (which is mostly the embedded
// `TextInput`).
.debug_selector(|| "COMBOBOX-TOGGLE".into())
.cursor_pointer()
.child(Icon::new(IconName::ChevronDown).size(IconSize::Small))
.on_click(cx.listener(|this, _, _, cx| {
this.open = !this.open;
cx.notify();
})),
)
.child({
let trigger_bounds = self.trigger_bounds.clone();
canvas(
move |bounds, _window, _cx| trigger_bounds.set(Some(bounds)),
|_bounds, _state, _window, _cx| {},
)
.absolute()
.top_0()
.left_0()
.size_full()
});
let trigger_width = px(240.);
v_flex()
.w(trigger_width)
.gap_1()
.child(trigger)
.when(open, |this| {
let hover = semantic::hover_bg(cx);
let mut list = v_flex()
.w(trigger_width)
.p_1()
.rounded_md()
.bg(semantic::elevated_surface(cx))
.border_1()
.border_color(semantic::border(cx))
.shadow_level(Shadow::Lg);
if filtered.is_empty() {
list = list.child(
div()
.px_3()
.py_2()
.child(Label::new("No matches").color(Color::Muted)),
);
}
for (i, option) in filtered {
let label = option.clone();
list = list.child(
h_flex()
.id(("combobox-option", i))
.w_full()
.px_3()
.py_2()
.rounded_md()
.cursor_pointer()
.hover(move |s| s.bg(hover))
.on_click(cx.listener(move |this, _, _, cx| {
this.selected = Some(i);
this.open = false;
let label = label.clone();
this.input
.update(cx, |input, cx| input.set_text(label.to_string(), cx));
cx.notify();
}))
.child(Label::new(option)),
);
}
// Float the list in a `deferred` overlay pass, anchored just
// below the trigger's real (previous-frame) bounds, instead
// of an inline flow child — so it never pushes sibling
// content down. Same idiom as `PopoverMenu`/`ContextMenu`
// (`crates/ui/src/components/popover_menu.rs`,
// `crates/ui/src/components/context_menu.rs`).
let mut anchor = anchored().snap_to_window_with_margin(px(8.));
if let Some(bounds) = self.trigger_bounds.get() {
anchor = anchor.position(point(
bounds.origin.x,
bounds.origin.y + bounds.size.height + px(4.),
));
}
let floating_list = deferred(
anchor.child(
div()
.occlude()
.debug_selector(|| "COMBOBOX-LIST".into())
.child(list),
),
)
.with_priority(1);
this.child(floating_list)
})
}
}
/// Standalone gallery preview for `Combobox` (not registered in the
/// `Component` catalog since it is a stateful `Entity`, matching `Select`'s
/// existing convention in this crate).
pub fn combobox_preview(_window: &mut Window, cx: &mut App) -> AnyElement {
v_flex()
.gap_4()
.child(cx.new(|cx| Combobox::new(cx, ["Apple", "Banana", "Cherry", "Date", "Elderberry"])))
.into_any_element()
}