Slint Kit Documentation

Layout

Container for Slint

KitContainer · Slint Kit 0.3.0

Centered column that limits reading width within available space.

Centered column that limits reading width within available space.
Native app built from the example below.

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 Save project: Rust handles the command and updates the action count.

ui/app.slint

export { KitFormValidation, HtmlInputKind, NumberInputFormat, KitInputConstraints, KitValidationResult, KitValidityState } from "@kit/kit.slint";
// SPDX-License-Identifier: GPL-3.0-or-later
import { KitButton, KitContainer, KitTextField, KitTheme, KitThemes } from "@kit/kit.slint";

export enum DemoAction { save-project }

export component App inherits Window {
    title: "KitContainer example";
    preferred-width: 480px;
    preferred-height: 290px;
    max-width: 100000px;
    max-height: 100000px;
    background: root.theme.canvas;
    in-out property <KitTheme> theme: KitThemes.light;
    in-out property <string> draft-0: "Field notes";
    in property <string> status: "Choose an action.";
    callback action-requested(DemoAction);
    VerticalLayout {
        padding: 24px; spacing: 16px; alignment: start;
        Text { text: "Container"; color: root.theme.text-primary; font-size: 20px * root.theme.text-scale; font-weight: 600; }
        KitContainer { min-height: self.preferred-height; Text { text: "Team workspace"; color: root.theme.text-primary; font-size: 14px * root.theme.text-scale; wrap: word-wrap; }KitTextField { theme: root.theme; label: "Project name"; text <=> root.draft-0; }KitButton { theme: root.theme; text: "Save project"; activated => { root.action-requested(DemoAction.save-project); } } }
        Text { text: root.status; color: root.theme.text-secondary; wrap: word-wrap; }
    }
}

src/main.rs

// SPDX-License-Identifier: GPL-3.0-or-later
use slint::ComponentHandle;
use std::cell::Cell;
slint::include_modules!();

fn main() -> Result<(), slint::PlatformError> {
    let app = App::new()?;
    slint_kit::init_form_validation!(self, app);
    let count = Cell::new(0_u32);
    let weak = app.as_weak();
    app.on_action_requested(move |action| {
        if let Some(app) = weak.upgrade() {
            let next = count.get().checked_add(1).expect("action count capacity");
            count.set(next);
            let label = match action {
                DemoAction::SaveProject => "Save project",
            };
            app.set_status(format!("{label} handled by Rust ({next})").into());
        }
    });
    app.run()
}
Cargo.toml and build.rs

Cargo.toml

[package]
name = "slint-kit-container-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

Choose a ContentWidth limit, then gutter and gap using LayoutSpace. Give the parent a finite width. Set min-height: self.preferred-height when the content should keep its full height.

The content limit does not become the container’s minimum width. available-width exposes the column’s actual width, while its height remains natural.

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
Centered column that limits reading width within available space.
Native screenshot of the same example, rendered with Skia.
// SPDX-License-Identifier: GPL-3.0-or-later
import { KitButton, KitContainer, KitTextField, KitTheme, KitThemes } from "@kit/kit.slint";

export component Example inherits Window {
    title: "KitContainer example";
    preferred-width: 480px;
    preferred-height: 290px;
    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: "Container"; color: root.theme.text-primary; font-size: 20px * root.theme.text-scale; font-weight: 600; }
        KitContainer { Text { text: "Team workspace"; color: root.theme.text-primary; font-size: 14px * root.theme.text-scale; wrap: word-wrap; }KitTextField { theme: root.theme; label: "Project name"; text: "Field notes"; }KitButton { theme: root.theme; text: "Save project"; activated => { root.status = "Action requested"; } } }
        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
content-width ContentWidth in
gutter LayoutSpace in
gap LayoutSpace in
available-width length out

Types and variants

Type Declaration
enum ContentWidth reading, standard, wide, fluid
enum LayoutSpace none, tight, compact, regular, roomy, section

See also