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Module - Combo Box

Module-level reference for iced::widget::combo_box.

Version: latest | Last updated: 2026-02-19

Module - Combo Box

Authoritative source: ref/doc/iced/widget/combo_box/index.html.

# Rustdoc description

Combo boxes display a dropdown list of searchable and selectable options.

# When to use

Use this module when you need the widget family and related style/state APIs grouped under iced::widget::combo_box.

# Example References

  • ref/examples/combo_box/src/main.rs

# Inline Examples (from rustdoc)

rust
use iced::widget::combo_box;

struct State {
   fruits: combo_box::State<Fruit>,
   favorite: Option<Fruit>,
}

#[derive(Debug, Clone)]
enum Fruit {
    Apple,
    Orange,
    Strawberry,
    Tomato,
}

#[derive(Debug, Clone)]
enum Message {
    FruitSelected(Fruit),
}

fn view(state: &State) -> Element<'_, Message> {
    combo_box(
        &state.fruits,
        "Select your favorite fruit...",
        state.favorite.as_ref(),
        Message::FruitSelected
    )
    .into()
}

fn update(state: &mut State, message: Message) {
    match message {
        Message::FruitSelected(fruit) => {
            state.favorite = Some(fruit);
        }
    }
}

impl std::fmt::Display for Fruit {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.write_str(match self {
            Self::Apple => "Apple",
            Self::Orange => "Orange",
            Self::Strawberry => "Strawberry",
            Self::Tomato => "Tomato",
        })
    }
}

# Use this when...

  • You need module-level APIs beyond the basic constructor call.
  • You want family-specific style/state traits and helper types.
  • You are building reusable widget abstractions.

# Minimal example

rust
// Start with the constructor from this module family in `view`.
// Then move to module APIs for deeper customization.

# How it works

Module docs explain the namespace that groups constructors, types, and related traits. In everyday app code, this helps you discover advanced options after basic usage works.

# Common patterns

rust
// Message flow pattern:
// widget interaction -> Message -> update -> state change -> rerender

# Gotchas / tips

  • Check this page together with its family page for complete context.
  • Verify trait bounds and associated types in rustdoc when custom styling fails.
  • Keep module imports explicit while learning.