native-theme-iced

iced toolkit connector for native-theme.

Maps native_theme::NativeTheme data to iced's theming system, producing a fully configured iced::Theme with correct colors for all built-in widget styles via iced's Catalog system.

Usage

Add both crates to your Cargo.toml:

[dependencies]
native-theme = "0.4"
native-theme-iced = "0.4"

Then create an iced theme from any native-theme preset or OS theme:

use native_theme::NativeTheme;
use native_theme_iced::to_theme;

// Load a preset
let nt = NativeTheme::preset("dracula").unwrap();

// Pick light or dark variant (with cross-fallback)
let is_dark = true;
if let Some(variant) = nt.pick_variant(is_dark) {
    let theme = to_theme(variant, "My App");
    // Use `theme` as your iced application theme
}

Or read the OS theme at runtime:

use native_theme::{from_system, NativeTheme};
use native_theme_iced::to_theme;

let nt = from_system().unwrap_or_else(|_| NativeTheme::preset("default").unwrap());
let is_dark = true;
if let Some(variant) = nt.pick_variant(is_dark) {
    let theme = to_theme(variant, "System Theme");
}

Widget Metrics

The crate exposes helper functions for widget sizing that iced applies per-widget rather than through the Catalog:

• button_padding(variant) -- horizontal and vertical padding
• input_padding(variant) -- text input padding
• border_radius(variant) -- standard corner radius
• border_radius_lg(variant) -- large corner radius (e.g., dialogs)
• scrollbar_width(variant) -- scrollbar track width
• font_family(variant) -- primary UI font family name
• font_size(variant) -- primary UI font size in pixels (converted from points)
• mono_font_family(variant) -- monospace font family name
• mono_font_size(variant) -- monospace font size in pixels

Modules

Custom Icons

For app-specific icons defined via native-theme-build, the connector provides:

• custom_icon_to_image_handle(provider, icon_set) -- load a custom icon as an iced image handle
• custom_icon_to_svg_handle(provider, icon_set) -- load as an SVG handle
• custom_icon_to_svg_handle_colored(provider, icon_set, color) -- load with color tinting

These work with any type implementing IconProvider.

Animated Icons

The connector provides helpers for displaying animated icons from loading_indicator():

• animated_frames_to_svg_handles() -- converts AnimatedIcon::Frames to a Vec<svg::Handle> for frame-based playback
• spin_rotation_radians() -- computes the current rotation angle for AnimatedIcon::Transform playback

use native_theme::{loading_indicator, prefers_reduced_motion, AnimatedIcon};
use native_theme_iced::icons::{animated_frames_to_svg_handles, spin_rotation_radians};

if let Some(anim) = loading_indicator("material") {
    if prefers_reduced_motion() {
        // Static fallback for accessibility
        let static_icon = anim.first_frame();
    } else {
        match &anim {
            AnimatedIcon::Frames { frame_duration_ms, .. } => {
                // Cache this -- do not call on every frame tick
                let handles = animated_frames_to_svg_handles(&anim);
                // Use iced::time::every(Duration::from_millis(*frame_duration_ms as u64))
                // to drive frame_index = (frame_index + 1) % handles.len()
                // In view: Svg::new(handles[frame_index].clone())
            }
            AnimatedIcon::Transform { icon, animation } => {
                let angle = spin_rotation_radians(elapsed, 1000);
                // Svg::new(handle).rotation(Rotation::Floating(angle))
            }
        }
    }
}

Cache the Vec<svg::Handle> from animated_frames_to_svg_handles() -- do not call it on every frame tick. Use Rotation::Floating (not Rotation::Solid) for spin animations to avoid layout jitter during rotation.

Example

Run the showcase widget gallery to explore all 17 presets interactively:

cargo run -p native-theme-iced --example showcase

The showcase displays all iced widgets (buttons, inputs, sliders, checkboxes, togglers, etc.) themed with native-theme presets, with live theme switching and a color map inspector.

Generate screenshots automatically:

cargo run -p native-theme-iced --example showcase --release -- \
  --icon-set material --variant dark --tab icons \
  --screenshot docs/assets/iced-linux-material-dark.png

License

Licensed under either of

• Apache License, Version 2.0
• MIT License
• 0BSD License

at your option.