guise-ui 1.5.0

A component library for gpui, Zed's GPU-accelerated UI framework: a themed palette, sizing tokens, 130+ composable components, a reactive state layer, and an in-app Safari-style inspector.
Documentation 
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//! `Loader` — an animated busy indicator (pulsing dots or bars).

use std::sync::OnceLock;
use std::time::{Duration, Instant};

use gpui::prelude::*;
use gpui::{
    canvas, point, pulsating_between, px, quad, size, transparent_black, App, BorderStyle, Bounds,
    IntoElement, Pixels, Window,
};

use crate::devtools::Probed;
use crate::frameclock::{request_frame, FrameKind};
use crate::style::ColorValue;
use crate::theme::{theme, ColorName, Size};

const FRAME_INTERVAL: Duration = Duration::from_millis(60);
const CYCLE_SECONDS: f32 = 0.9;

fn animation_start() -> Instant {
    static START: OnceLock<Instant> = OnceLock::new();
    *START.get_or_init(Instant::now)
}

fn request_next_frame(window: &mut Window, cx: &mut App) {
    request_frame(FrameKind::Continuous, FRAME_INTERVAL, window, cx);
}

/// The loader's visual style.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum LoaderVariant {
    /// Three pulsing dots (the default).
    Dots,
    /// Three pulsing vertical bars.
    Bars,
}

/// An animated loading indicator.
#[derive(IntoElement)]
pub struct Loader {
    variant: LoaderVariant,
    size: Size,
    color: ColorValue,
}

impl Loader {
    pub fn new() -> Self {
        Loader {
            variant: LoaderVariant::Dots,
            size: Size::Md,
            color: ColorValue::Named(ColorName::Blue),
        }
    }

    pub fn variant(mut self, variant: LoaderVariant) -> Self {
        self.variant = variant;
        self
    }

    pub fn size(mut self, size: Size) -> Self {
        self.size = size;
        self
    }

    pub fn color(mut self, color: impl Into<ColorValue>) -> Self {
        self.color = color.into();
        self
    }

    fn unit(&self) -> f32 {
        match self.size {
            Size::Xs => 6.0,
            Size::Sm => 8.0,
            Size::Md => 10.0,
            Size::Lg => 13.0,
            Size::Xl => 16.0,
        }
    }
}

impl Default for Loader {
    fn default() -> Self {
        Loader::new()
    }
}

impl RenderOnce for Loader {
    fn render(self, _window: &mut Window, cx: &mut App) -> impl IntoElement {
        let t = theme(cx);
        let color = crate::style::solid(t, self.color);
        let unit = self.unit();
        let bars = self.variant == LoaderVariant::Bars;
        let width = if bars { unit * 0.6 } else { unit };
        let height = if bars { unit * 2.4 } else { unit };
        let gap = unit * 0.6;
        let total_width = width * 3.0 + gap * 2.0;
        let radius = if bars { unit * 0.3 } else { unit };

        canvas(
            |_, _, _| (),
            move |bounds: Bounds<Pixels>, _, window, cx| {
                if !bounds.intersects(&window.content_mask().bounds) {
                    return;
                }
                let cycle = animation_start().elapsed().as_secs_f32() / CYCLE_SECONDS;
                let pulse = pulsating_between(0.25, 1.0);
                for index in 0..3 {
                    let delta = (cycle + index as f32 / 3.0) % 1.0;
                    let item = Bounds {
                        origin: point(
                            bounds.origin.x + px(index as f32 * (width + gap)),
                            bounds.origin.y,
                        ),
                        size: size(px(width), px(height)),
                    };
                    window.paint_quad(quad(
                        item,
                        px(radius),
                        color.opacity(pulse(delta)),
                        px(0.0),
                        transparent_black(),
                        BorderStyle::default(),
                    ));
                }
                request_next_frame(window, cx);
            },
        )
        .w(px(total_width))
        .h(px(height))
        .probe("Loader")
    }
}