---
title: Widget Styles
description: std-widgets Style.
---


import { Tabs, TabItem } from '@astrojs/starlight/components';
import SlintProperty from '@slint/common-files/src/components/SlintProperty.astro';
import Link from '@slint/common-files/src/components/Link.astro';

You can modify the look of these widgets by choosing a style.

The styles available include:

| Style Name | Light Variant | Dark Variant | Description |
|------------|--------------|--------------|------------|
| `fluent`   | `fluent-light`| `fluent-dark`| These variants belong to the **Fluent** style, which is based on the [Fluent Design System](https://fluent2.microsoft.design/). |
| `material` | `material-light`| `material-dark`| These variants are part of the **Material** style, which follows the [Material Design](https://m3.material.io). |
| `cupertino`| `cupertino-light`| `cupertino-dark`| The **Cupertino** variants emulate the style used by macOS. |
| `cosmic`| `cosmic-light`| `cosmic-dark`| The **Cosmic** variants emulate the style used by [Cosmic Desktop](https://github.com/pop-os/cosmic). |
| `qt`   | | | The **Qt** style uses [Qt](https://en.wikipedia.org/wiki/Qt_(software)) to render widgets. This style requires Qt to be installed on your system. |
| `native` | | | This is an alias to one of the other styles depending on the platform. It is `cupertino` on macOS, `fluent` on Windows, `material` on Android, `qt` on linux if Qt is available, or `fluent` otherwise. |


By default, the styles automatically adapt to the system's dark or light color setting. Select a `-light` or `-dark` variant to override the system setting and always show either dark or light colors.

The widget style is determined at your project's compile time. The method to select a style depends on how you use Slint.

If no style is selected, `fluent` is the default on all platforms.

<Tabs syncKey="dev-language">
<TabItem label="Rust" icon="seti:rust">

You can select the style before starting your compilation by setting the `SLINT_STYLE` environment variable to the name of your chosen style.

When using the `slint_build` API, call the [`slint_build::compile_with_config()`](https://docs.rs/slint-build/newest/slint_build/fn.compile_with_config.html) function.

When using the `slint_interpreter` API, call the [`slint_interpreter::ComponentCompiler::set_style()`](https://docs.rs/slint-interpreter/newest/slint_interpreter/struct.ComponentCompiler.html#method.set_style) function.
</TabItem>
<TabItem label="C++" icon="seti:cpp">

Define a `SLINT_STYLE` CMake cache variable to contain the style name as a string. This can be done, for instance, on the command line:

```sh
cmake -DSLINT_STYLE="material" /path/to/source
```
</TabItem>
<TabItem label="NodeJS" icon="node">

You can select the style by setting the `style` property in [`LoadFileOptions`](slint-node:interfaces/LoadFileOptions) passed to [`loadFile`](slint-node:functions/loadFile):

```js
import * as slint from "slint-ui";
let ui = slint.loadFile("main.slint", { style: "fluent" });
let main = new ui.Main();
main.greeting = "Hello friends";
```
</TabItem>
<TabItem label="Python" icon="seti:python">

You can specify the style by setting the `SLINT_STYLE` environment variable in the beginning of your Python script:

```python
import slint
import os


os.environ["SLINT_STYLE"] = "material"
# or
# os.environ.setdefault("SLINT_STYLE", "material")


class MainWindow(slint.loader.ui.app.AppWindow): ...


main_window = MainWindow()
main_window.show()
main_window.run()
```
</TabItem>
</Tabs>

## Using Style Properties In Your Own Components

The global <Link type="Palette" label="Palette"/> and <Link type="StyleMetrics" label="StyleMetrics"/> properties can be accessed and will be set to the appropriate values of the current style.

```slint playground
import { Palette, StyleMetrics } from "std-widgets.slint";

export component Example inherits Window {
    Rectangle {
        border-radius: StyleMetrics.layout-padding;
        border-width: 2px;
        border-color: Palette.border;
        background: Palette.background;
    }
}
```

In situations where the specific property is not available you can detect the style via `Platform.style-name`.

```slint playground
import { Palette } from "std-widgets.slint";

export component Example inherits Window {
    Rectangle {
        border-radius: Platform.style-name == "fluent" ? 4px : 2px;
        border-width: Platform.style-name == "fluent" ? 2px : 1px;
        border-color: Palette.border;
        background: Palette.background;
    }
}
```

## Previewing Designs With `slint-viewer`

Select the style either by setting the `SLINT_STYLE` environment variable, or by passing the style name with the `--style` argument:

slint-viewer --style material /path/to/design.slint

## Previewing Designs With The Slint Visual Studio Code Extension

To select the style, first open the Visual Studio Code settings editor:

<Tabs syncKey="dev-platform">
<TabItem label="Windows" icon="seti:windows">
File > Preferences > Settings
</TabItem>
<TabItem label="macOS" icon="apple">
Code > Preferences > Settings
</TabItem>
<TabItem label="Linux" icon="linux">
File > Preferences > Settings
</TabItem>
</Tabs>

Then enter the style name in Extensions > Slint > Preview:Style

## Previewing Designs With The Generic LSP Process

Choose the style by setting the `SLINT_STYLE` environment variable before launching the process.
Alternatively, if your IDE integration allows for command line parameters, you can specify the style using `--style`.
