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//! Meter component — measurement indicator with zones (low/optimal/high).
use maud::{html, Markup};
/// Meter rendering properties
#[derive(Debug, Clone)]
pub struct Props {
/// Current value of the meter
pub value: f64,
/// Minimum value (default 0.0)
pub min: f64,
/// Maximum value (default 100.0)
pub max: f64,
/// Threshold below which the zone is "suboptimum" (warning)
pub low: Option<f64>,
/// Threshold above which the zone is "suboptimum" (warning)
pub high: Option<f64>,
/// The ideal value; if present, determines which side is "good"
pub optimum: Option<f64>,
/// Label for the meter (accessibility)
pub label: String,
}
impl Default for Props {
fn default() -> Self {
Self {
value: 0.0,
min: 0.0,
max: 100.0,
low: None,
high: None,
optimum: None,
label: String::new(),
}
}
}
/// Determine the zone class based on value, thresholds, and optimum.
fn zone_class(
value: f64,
min: f64,
max: f64,
low: Option<f64>,
high: Option<f64>,
optimum: Option<f64>,
) -> &'static str {
// If no optimum, always optimum
if optimum.is_none() {
return "optimum";
}
let opt = optimum.unwrap();
let mid = (min + max) / 2.0;
// Determine which side is ideal based on optimum position
if opt >= mid {
// Ideal side is "high" (e.g., battery level — higher is better)
// low = minimum acceptable, high = good threshold
if let Some(l) = low {
if value < l {
return "danger";
}
}
if let Some(h) = high {
if value >= h {
return "optimum";
}
}
"suboptimum"
} else {
// Ideal side is "low" (e.g., disk usage — lower is better)
// Zones are: optimum (before midpoint), suboptimum (midpoint to high), danger (above high)
if let Some(h) = high {
if value > h {
return "danger";
}
}
let zone_threshold = if let (Some(l), Some(h)) = (low, high) {
(l + h) / 2.0
} else {
low.unwrap_or(high.unwrap_or(mid))
};
if value <= zone_threshold {
"optimum"
} else {
"suboptimum"
}
}
}
/// Render a single meter with the given properties
pub fn render(props: Props) -> Markup {
let pct = ((props.value - props.min) / (props.max - props.min) * 100.0).clamp(0.0, 100.0);
let zone = zone_class(
props.value,
props.min,
props.max,
props.low,
props.high,
props.optimum,
);
let width_style = format!("width: {:.1}%", pct);
html! {
div class="mui-meter" role="meter" aria-valuenow=(props.value) aria-valuemin=(props.min) aria-valuemax=(props.max) aria-label=(props.label) {
div.mui-meter__track {
div class={
"mui-meter__bar "
"mui-meter__bar--" (zone)
} style=(width_style) {}
}
}
}
}
/// Showcase battery level and disk usage meters
pub fn showcase() -> Markup {
html! {
div.mui-showcase__grid {
// Battery level (higher is better)
div {
p.mui-showcase__caption { "Battery level (higher is better)" }
div.mui-showcase__row {
// Low (danger)
div {
(render(Props {
value: 15.0,
min: 0.0,
max: 100.0,
low: Some(20.0),
high: Some(80.0),
optimum: Some(100.0),
label: "Battery 15%".into(),
}))
p.mui-showcase__label { "15%" }
}
// Medium (warning)
div {
(render(Props {
value: 60.0,
min: 0.0,
max: 100.0,
low: Some(20.0),
high: Some(80.0),
optimum: Some(100.0),
label: "Battery 60%".into(),
}))
p.mui-showcase__label { "60%" }
}
// High (success)
div {
(render(Props {
value: 90.0,
min: 0.0,
max: 100.0,
low: Some(20.0),
high: Some(80.0),
optimum: Some(100.0),
label: "Battery 90%".into(),
}))
p.mui-showcase__label { "90%" }
}
}
}
// Disk usage (lower is better)
div {
p.mui-showcase__caption { "Disk usage (lower is better)" }
div.mui-showcase__row {
// Low (success)
div {
(render(Props {
value: 25.0,
min: 0.0,
max: 100.0,
low: Some(20.0),
high: Some(80.0),
optimum: Some(0.0),
label: "Disk 25%".into(),
}))
p.mui-showcase__label { "25%" }
}
// Medium (warning)
div {
(render(Props {
value: 70.0,
min: 0.0,
max: 100.0,
low: Some(20.0),
high: Some(80.0),
optimum: Some(0.0),
label: "Disk 70%".into(),
}))
p.mui-showcase__label { "70%" }
}
// High (danger)
div {
(render(Props {
value: 95.0,
min: 0.0,
max: 100.0,
low: Some(20.0),
high: Some(80.0),
optimum: Some(0.0),
label: "Disk 95%".into(),
}))
p.mui-showcase__label { "95%" }
}
}
}
}
}
}