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use std::{cell::Cell, rc::Rc};
use gpui::{AnyElement, Bounds, Context, Pixels, Render, anchored, canvas, deferred, point};
use crate::prelude::*;
use crate::{Chip, ToggleState};
/// A multi-value select: a trigger showing selected values as dismissible
/// `Chip`s plus a `DropdownMenu`-style checklist popover; toggling an option
/// adds/removes its `Chip`. Stateful view — create with
/// `cx.new(|_| MultiSelect::new(options))`.
pub struct MultiSelect {
options: Vec<SharedString>,
selected: Vec<usize>,
open: bool,
placeholder: SharedString,
/// 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 MultiSelect {
pub fn new(options: impl IntoIterator<Item = impl Into<SharedString>>) -> Self {
Self {
options: options.into_iter().map(Into::into).collect(),
selected: Vec::new(),
open: false,
placeholder: "Select options…".into(),
trigger_bounds: Rc::new(Cell::new(None)),
}
}
pub fn placeholder(mut self, placeholder: impl Into<SharedString>) -> Self {
self.placeholder = placeholder.into();
self
}
pub fn selected_indices(mut self, indices: impl IntoIterator<Item = usize>) -> Self {
self.selected = indices.into_iter().collect();
self
}
/// The currently selected option labels.
pub fn values(&self) -> Vec<&SharedString> {
self.selected
.iter()
.filter_map(|&i| self.options.get(i))
.collect()
}
}
impl Render for MultiSelect {
fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
let open = self.open;
let has_selection = !self.selected.is_empty();
let mut chips_row = h_flex().flex_1().flex_wrap().gap_1();
if has_selection {
for &i in &self.selected {
if let Some(label) = self.options.get(i).cloned() {
chips_row = chips_row.child(Chip::new(label).pill(true).dismissible(
cx.listener(move |this, _, _, cx| {
this.selected.retain(|&x| x != i);
cx.notify();
}),
));
}
}
} else {
chips_row =
chips_row.child(Label::new(self.placeholder.clone()).color(Color::Placeholder));
}
let trigger = h_flex()
.id("multi-select-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(|| "MULTI-SELECT-TRIGGER".into())
.w_full()
.min_h(px(40.))
.items_center()
.justify_between()
.gap_2()
.px_3()
.py_2()
.rounded_md()
.bg(semantic::surface(cx))
.border_1()
.border_color(if open {
palette::primary(500)
} else {
semantic::border(cx)
})
.cursor_pointer()
.on_click(cx.listener(|this, _, _, cx| {
this.open = !this.open;
cx.notify();
}))
.child(chips_row)
.child(Icon::new(IconName::ChevronDown).size(IconSize::Small))
.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(280.);
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);
for (i, option) in self.options.iter().enumerate() {
let checked = self.selected.contains(&i);
let option = option.clone();
list = list.child(
h_flex()
.id(("multi-select-option", i))
.w_full()
.items_center()
.gap_2()
.px_3()
.py_2()
.rounded_md()
.cursor_pointer()
.hover(move |s| s.bg(hover))
.on_click(cx.listener(move |this, _, _, cx| {
if let Some(pos) = this.selected.iter().position(|&x| x == i) {
this.selected.remove(pos);
} else {
this.selected.push(i);
}
cx.notify();
}))
.child(
Checkbox::new(
("multi-select-check", i),
if checked {
ToggleState::Selected
} else {
ToggleState::Unselected
},
)
.visualization_only(true),
)
.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(|| "MULTI-SELECT-LIST".into())
.child(list),
),
)
.with_priority(1);
this.child(floating_list)
})
}
}
/// Standalone gallery preview for `MultiSelect` (not registered in the
/// `Component` catalog since it is a stateful `Entity`, matching `Select`'s
/// existing convention in this crate).
pub fn multi_select_preview(_window: &mut Window, cx: &mut App) -> AnyElement {
v_flex()
.gap_4()
.child(cx.new(|_| {
MultiSelect::new(["Design", "Engineering", "Marketing", "Sales", "Support"])
.selected_indices([0, 2])
}))
.into_any_element()
}