Struct Menu 

pub struct Menu;

A horizontal menu bar component.

This component provides a horizontal menu bar for application commands and navigation. Items can be navigated with Left/Right arrows and activated with Enter.

Keyboard Navigation

The menu itself doesn’t handle keyboard events directly. Your application should map:

• Right arrow to MenuMessage::Right
• Left arrow to MenuMessage::Left
• Enter to MenuMessage::Select

Visual Layout

File  Edit  View  Help
^^^^
└── Selected item (highlighted)

Example

use envision::component::{Menu, MenuMessage, MenuOutput, MenuState, MenuItem, Component};

let mut state = MenuState::new(vec![
    MenuItem::new("New"),
    MenuItem::new("Open"),
    MenuItem::disabled("Save"),
]);

// Navigate
Menu::update(&mut state, MenuMessage::Right);

// Select
let output = Menu::update(&mut state, MenuMessage::Select);
assert_eq!(output, Some(MenuOutput::Selected(1)));

Trait Implementations

impl Component for Menu

type State = MenuState

The component’s internal state type.

type Message = MenuMessage

Messages this component can receive.

type Output = MenuOutput

Messages this component can emit to its parent.

fn init() -> Self::State

Initialize the component state.

fn update(state: &mut Self::State, msg: Self::Message) -> Option<Self::Output>

Update component state based on a message.

fn handle_event( _state: &Self::State, event: &Event, ctx: &ViewContext, ) -> Option<Self::Message>

Maps an input event to a component message.

fn view( state: &Self::State, frame: &mut Frame<'_>, area: Rect, theme: &Theme, ctx: &ViewContext, )

Render the component to the given area.

fn traced_view( state: &Self::State, frame: &mut Frame<'_>, area: Rect, theme: &Theme, ctx: &ViewContext, )

Renders the component with optional tracing instrumentation.

fn dispatch_event( state: &mut Self::State, event: &Event, ctx: &ViewContext, ) -> Option<Self::Output>

Dispatches an event by mapping it to a message and updating state.