Breadcrumbs for Slint

KitBreadcrumbs · Slint Kit 0.3.0

Breadcrumb trail linking parent levels to the current location.

Try the component

Download the complete project, extract it and run cargo run --locked in its folder. Rust 1.92+; Slint Kit 0.3.0 from crates.io. You can also copy the four files below.

Click Activity in the path to choose the matching Rust destination.

ui/app.slint

export { KitFormValidation, HtmlInputKind, NumberInputFormat, KitInputConstraints, KitValidationResult, KitValidityState } from "@kit/kit.slint";
// SPDX-License-Identifier: GPL-3.0-or-later
import { KitBreadcrumbs, OptionRow, SelectState, NavigationStep, CloseReason, SelectionAvailability, KitTheme, KitThemes } from "@kit/kit.slint";
export component App inherits Window {
    title: "KitBreadcrumbs example";
    preferred-width: 520px;
    preferred-height: 180px;
    max-width: 100000px;
    max-height: 100000px;
    background: root.theme.canvas;
    in-out property <KitTheme> theme: KitThemes.light;
    in property <[OptionRow]> rows;
    in property <SelectState> select-state;
    in property <string> selected-label: "Overview";
    in-out property <string> query;
    callback select-open();
    callback select-navigate(NavigationStep);
    callback select-activate(int, int);
    callback select-dismiss(CloseReason);
    callback select-query(string);
    callback select-typeahead(string);
    VerticalLayout {
        padding: 24px;
        spacing: 16px;
        alignment: start;
        control := KitBreadcrumbs { theme: root.theme; rows: root.rows; activate(token, generation) => { root.select-activate(token, generation); } }
        result := Text { text: "Selected: " + root.selected-label; color: root.theme.text-primary; }
    }

}

src/main.rs

// SPDX-License-Identifier: GPL-3.0-or-later
use slint::ComponentHandle;
use slint_kit::{Ownership, SelectOption, SelectionIntent};
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
enum Destination { Overview, Activity, Settings }
impl Destination {
    fn label(self) -> &'static str {
        match self { Self::Overview => "Overview", Self::Activity => "Activity", Self::Settings => "Settings" }
    }
}

mod ui { slint::include_modules!(); }
fn main() -> Result<(), slint::PlatformError> {
    let app = ui::App::new()?;
    slint_kit::init_form_validation!(ui, app);
    let selection = slint_kit::bind_select!(ui, app, vec![
        SelectOption::new(Destination::Overview, "Overview"),
        SelectOption::new(Destination::Activity, "Activity"),
        SelectOption::new(Destination::Settings, "Settings"),
    ], Some(Destination::Overview), Ownership::Local);
    selection.open();
    let weak = app.as_weak();
    selection.on_intent(move |intent| {
        if let Some(app) = weak.upgrade() {
            app.set_selected_label(match intent {
                SelectionIntent::Commit(key) => key.label(),
                SelectionIntent::Clear => "No selection",
            }.into());
        }
    });
    let persistent = selection.clone();
    app.on_select_activate(move |token, generation| {
        persistent.activate(token, generation);
        persistent.open();
    });
    app.run()
}

Cargo.toml and build.rs

Cargo.toml

[package]
name = "slint-kit-breadcrumbs-example"
version = "0.1.0"
edition = "2024"
rust-version = "1.92"
license = "GPL-3.0-or-later"
publish = false

[dependencies]
slint-kit = "=0.3.0"
slint = { version = "=1.18.1", default-features = false, features = ["std", "compat-1-18", "backend-winit", "renderer-skia", "accessibility"] }

[build-dependencies]
slint-kit-build = "=0.3.0"

[workspace]

build.rs

fn main() { slint_kit_build::compile("ui/app.slint").expect("compile component example"); }

Files: Cargo.toml · build.rs · ui/app.slint · src/main.rs

Supply OptionRow values from the root level to the current level. Handle activate(token, generation) to open a parent destination.

The final item is current-location text without an action; preceding items remain named buttons. The bar can scroll horizontally for long paths.

View source ↗

Visual composition

The file below produces the screenshot. For controller-driven components, it shows the displayed state without supplying the Rust wiring. Create a project.

Show the screenshot source

// SPDX-License-Identifier: GPL-3.0-or-later
import { KitBreadcrumbs, KitTheme, KitThemes } from "@kit/kit.slint";

export component Example inherits Window {
    title: "KitBreadcrumbs example";
    preferred-width: 480px;
    preferred-height: 160px;
    max-width: 100000px;
    max-height: 100000px;
    background: root.theme.canvas;
    in-out property <KitTheme> theme: KitThemes.light;
    in-out property <string> status;
    VerticalLayout {
        padding: 24px; spacing: 16px; alignment: start;
        Text { text: "Breadcrumbs"; color: root.theme.text-primary; font-size: 20px * root.theme.text-scale; font-weight: 600; }
        KitBreadcrumbs { theme: root.theme; rows: [{ token: 11, generation: 1, label: "Workspace", disabled: false }, { token: 23, generation: 1, label: "Projects", disabled: false }, { token: 38, generation: 1, label: "Field notes", disabled: false }]; }
        if root.status != "": Text { text: root.status; color: root.theme.text-secondary; font-size: 12px * root.theme.text-scale; wrap: word-wrap; }
    }
}

Download this example

Public API

Inherits Rectangle.

Properties

Name	Type	Direction
`theme`	`KitTheme`	`in`
`control-size`	`ControlSize`	`in`
`rows`	`[OptionRow]`	`in`

Types and variants

Type	Declaration
`enum ControlSize`	`compact, medium, comfortable`
`struct OptionRow`	`token: int, generation: int, label: string, description: string, disabled: bool`

Callbacks

activate(int, int)