Tutorial 4 - Theming and Components

As your app grows, extracting reusable widget builders and centralizing theme choices keeps view code readable.

# Use this when...

• Your view function is getting too large.
• You need consistent button/field styling.
• You want runtime-level theme decisions.

# Minimal example

use iced::widget::{button, text};

fn padded_button<'a>(label: &'a str) -> iced::widget::Button<'a, Message> {
    button(text(label)).padding([12, 24])
}

# How it works

Component extraction in Iced is usually just Rust functions returning widgets or Element<Message>. Theme selection often lives at app boot (application(...).theme(...)) and style details live near widget construction.

# Common patterns

pub fn main() -> iced::Result {
    iced::application(App::new, App::update, App::view)
        .theme(App::theme)
        .run()
}

# Gotchas / tips

• Keep extracted UI helpers message-typed so event flow remains obvious.
• Prefer small reusable builders over deeply nested giant view trees.
• Set theme in one place to avoid style drift.

# Continue

• Guide: Distribution
• Core Concepts