Switch

A controlled on/off control with separately styleable track and thumb.

Like every gpui-base primitive, Switch supplies behavior and semantic structure without imposing a product visual language. Apply GPUI styles and compose the exported parts to match your design system.

Example

The single native Cargo entrypoint selects this primitive from the shared showcase implementation. The same showcase is compiled once for the WASM preview above.

cargo run -p gpui-base --example components -- switch

Import

use gpui_base::{Switch, SwitchThumb, SwitchTrack};

Anatomy and API

The example composes Switch, SwitchThumb, SwitchTrack. GPUI's standard styling and event traits provide presentation; these base types provide the interaction structure.

The authoritative module is components/switch.rs. Native and browser previews compile this same file.

State and events

Pass the controlled boolean to checked; on_change emits the requested next value.

Keep controlled state on the parent render type or in a GPUI entity. Update it in callbacks and call cx.notify(); do not recreate persistent entities during every render.

Complete Rust example

The complete implementation used by the runnable showcase is embedded directly from Rust source:

use super::*;

impl BaseShowcase {
    pub(in super::super) fn switch(&self, cx: &mut Context<Self>) -> impl IntoElement {
        let checked = self.switch_checked;
        let entity = cx.entity().downgrade();
        div()
            .w_64()
            .text_xs()
            .flex()
            .items_center()
            .justify_between()
            .child(
                div().child("Automatic updates").child(
                    div()
                        .mt_1()
                        .text_xs()
                        .text_color(super::example_rgb(0x737373))
                        .child("Install stable releases automatically."),
                ),
            )
            .child(
                Switch::new("example-switch")
                    .checked(checked)
                    .on_change(move |next, _, _, cx| {
                        _ = entity.update(cx, |this, cx| {
                            this.switch_checked = next;
                            cx.notify();
                        });
                    })
                    .child(
                        SwitchTrack::new("example-switch-track")
                            .checked(checked)
                            .w(px(36.))
                            .h(px(20.))
                            .p(px(2.))
                            .bg(if checked {
                                super::example_rgb(0x171717)
                            } else {
                                super::example_rgb(0xd4d4d4)
                            })
                            .child(
                                SwitchThumb::new(checked)
                                    .size_4()
                                    .bg(super::example_rgb(0xffffff))
                                    .ml(if checked { px(16.) } else { px(0.) }),
                            ),
                    ),
            )
    }
}

The command above supplies application initialization, window creation, and shared BaseShowcase state.

Accessibility

Label the setting, expose checked state, and keep the accessible name stable.

Notes

Use stable element IDs where accepted. Verify focus, hover, active, selected, disabled, reduced-motion, and high-contrast appearances in the consuming design system.