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use crate::theme::use_theme;
use kael::{prelude::FluentBuilder as _, *};
use std::rc::Rc;
#[derive(Copy, Clone, Default, PartialEq, Eq)]
pub enum GaugeSize {
Sm,
#[default]
Md,
Lg,
Custom(u32),
}
impl GaugeSize {
fn dimensions(self) -> (f32, f32) {
match self {
GaugeSize::Sm => (120.0, 80.0),
GaugeSize::Md => (200.0, 130.0),
GaugeSize::Lg => (300.0, 190.0),
GaugeSize::Custom(w) => (w as f32, w as f32 * 0.65),
}
}
fn stroke_width(self) -> f32 {
match self {
GaugeSize::Sm => 10.0,
GaugeSize::Md => 16.0,
GaugeSize::Lg => 22.0,
GaugeSize::Custom(w) => (w as f32 * 0.08).max(6.0),
}
}
}
struct PaintData {
value: f32,
color: Hsla,
track_color: Hsla,
stroke_width: f32,
}
#[derive(IntoElement)]
pub struct Gauge {
_id: SharedString,
value: f32,
label: Option<SharedString>,
format_fn: Option<Rc<dyn Fn(f32) -> String>>,
size: GaugeSize,
color: Option<Hsla>,
track_color: Option<Hsla>,
style: StyleRefinement,
}
impl Gauge {
pub fn new(id: impl Into<SharedString>) -> Self {
Self {
_id: id.into(),
value: 0.0,
label: None,
format_fn: None,
size: GaugeSize::default(),
color: None,
track_color: None,
style: StyleRefinement::default(),
}
}
pub fn value(mut self, value: f32) -> Self {
self.value = value.clamp(0.0, 1.0);
self
}
pub fn label(mut self, label: impl Into<SharedString>) -> Self {
self.label = Some(label.into());
self
}
pub fn format(mut self, f: impl Fn(f32) -> String + 'static) -> Self {
self.format_fn = Some(Rc::new(f));
self
}
pub fn size(mut self, size: GaugeSize) -> Self {
self.size = size;
self
}
pub fn color(mut self, color: Hsla) -> Self {
self.color = Some(color);
self
}
pub fn track_color(mut self, color: Hsla) -> Self {
self.track_color = Some(color);
self
}
}
impl Styled for Gauge {
fn style(&mut self) -> &mut StyleRefinement {
&mut self.style
}
}
impl RenderOnce for Gauge {
fn render(self, _window: &mut Window, _cx: &mut App) -> impl IntoElement {
let theme = use_theme();
let user_style = self.style;
let (width, height) = self.size.dimensions();
let stroke = self.size.stroke_width();
let gauge_color = self.color.unwrap_or_else(|| rgb(0x3b82f6).into());
let track = self.track_color.unwrap_or(theme.tokens.muted);
let formatted_value = if let Some(ref fmt) = self.format_fn {
fmt(self.value)
} else {
format!("{}%", (self.value * 100.0) as i32)
};
let text_color = theme.tokens.foreground;
let label_color = theme.tokens.muted_foreground;
let paint_data = PaintData {
value: self.value,
color: gauge_color,
track_color: track,
stroke_width: stroke,
};
div()
.flex()
.flex_col()
.items_center()
.gap(px(4.0))
.map(|this| {
let mut d = this;
d.style().refine(&user_style);
d
})
.child(
div()
.w(px(width))
.h(px(height))
.relative()
.child(
canvas_with_prepaint(
move |_bounds, _window, _cx| paint_data,
move |bounds, data, window, _cx| {
if bounds.size.width <= px(0.0) || bounds.size.height <= px(0.0) {
return;
}
let w = bounds.size.width;
let center_x = bounds.left() + w * 0.5;
let arc_radius = w * 0.5 - px(data.stroke_width * 0.5);
if arc_radius <= px(0.0) {
return;
}
let center_y = bounds.bottom() - px(data.stroke_width * 0.5);
let segments = 60_usize;
let start_angle: f32 = std::f32::consts::PI;
let end_angle: f32 = 0.0;
{
let mut builder = PathBuilder::stroke(px(data.stroke_width));
for i in 0..=segments {
let t = i as f32 / segments as f32;
let angle = start_angle + (end_angle - start_angle) * t;
let pt = point(
center_x + arc_radius * angle.cos(),
center_y + arc_radius * angle.sin(),
);
if i == 0 {
builder.move_to(pt);
} else {
builder.line_to(pt);
}
}
if let Ok(path) = builder.build() {
window.paint_path(path, data.track_color);
}
}
if data.value > 0.0 {
let value_end =
start_angle + (end_angle - start_angle) * data.value;
let value_segments =
((segments as f32 * data.value) as usize).max(2);
let mut builder = PathBuilder::stroke(px(data.stroke_width));
for i in 0..=value_segments {
let t = i as f32 / value_segments as f32;
let angle = start_angle + (value_end - start_angle) * t;
let pt = point(
center_x + arc_radius * angle.cos(),
center_y + arc_radius * angle.sin(),
);
if i == 0 {
builder.move_to(pt);
} else {
builder.line_to(pt);
}
}
if let Ok(path) = builder.build() {
window.paint_path(path, data.color);
}
}
},
)
.size_full(),
)
.child(
div()
.absolute()
.bottom(px(4.0))
.left_0()
.right_0()
.flex()
.justify_center()
.child(
div()
.text_lg()
.font_weight(FontWeight::BOLD)
.text_color(text_color)
.child(formatted_value),
),
),
)
.when_some(self.label, |this, lbl| {
this.child(div().text_sm().text_color(label_color).child(lbl))
})
}
}