Struct Sparkline 

pub struct Sparkline;

A compact inline data trend display component.

Sparkline renders a series of data points as small bars using ratatui’s Sparkline widget. This is a display-only component that does not receive keyboard focus.

Visual Format

The sparkline renders data as a compact bar chart:

▁▃▅▇█▅▃▁▂▄▆█▇▅▃

With an optional title:

┌CPU Usage──────┐
│▁▃▅▇█▅▃▁▂▄▆█▇▅│
└───────────────┘

Messages

• Push(f64) - Append a data point
• PushBounded(f64, usize) - Append with max capacity
• SetData(Vec<f64>) - Replace all data
• Clear - Clear all data
• SetMaxDisplayPoints(Option<usize>) - Set display limit

Example

use envision::component::{Sparkline, SparklineMessage, SparklineState, Component};

let mut state = SparklineState::with_data(vec![1.0, 3.0, 7.0, 2.0, 5.0, 8.0, 4.0]);

// Append new data
Sparkline::update(&mut state, SparklineMessage::Push(6.0));
assert_eq!(state.len(), 8);

// Replace data
Sparkline::update(&mut state, SparklineMessage::SetData(vec![10.0, 20.0, 30.0]));
assert_eq!(state.len(), 3);

Trait Implementations

impl Component for Sparkline

type State = SparklineState

The component’s internal state type.

type Message = SparklineMessage

Messages this component can receive.

type Output = ()

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 view(state: &Self::State, ctx: &mut RenderContext<'_, '_>)

Render the component to the given area.

fn traced_view(state: &Self::State, ctx: &mut RenderContext<'_, '_>)

Renders the component with optional tracing instrumentation.

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

Maps an input event to a component message.

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

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