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31:T112f,"use client"; import { useEffect, useState, type RefObject } from "react"; import { motion, useMotionValue, useReducedMotion, useSpring } from "motion/react"; import { cn } from "@/lib/utils"; export type ScrollProgressProps = { /** Scroll surface to measure. When omitted, the document is measured. */ container?: RefObject; position?: "top" | "bottom"; thickness?: number; color?: string; stiffness?: number; damping?: number; direction?: "ltr" | "rtl"; className?: string; }; type Placement = { left: number; top: number; width: number; rtl: boolean }; export function ScrollProgress({ container, position = "top", thickness = 3, color = "var(--foreground)", stiffness = 150, damping = 28, direction, className, }: ScrollProgressProps) { const reduceMotion = useReducedMotion(); const direct = useMotionValue(0); const spring = useSpring(0, { stiffness, damping, mass: 0.22 }); const progress = reduceMotion ? direct : spring; const [placement, setPlacement] = useState({ left: 0, top: 0, width: 0, rtl: false }); const barThickness = Math.max(1, thickness); useEffect(() => { const surface = container?.current ?? (document.scrollingElement as HTMLElement | null) ?? document.documentElement; const isPage = !container?.current; let frame = 0; const measure = () => { frame = 0; const maxScroll = Math.max(0, surface.scrollHeight - (isPage ? window.innerHeight : surface.clientHeight)); const ratio = maxScroll > 0 ? Math.min(1, Math.max(0, surface.scrollTop / maxScroll)) : 0; progress.set(ratio); const rect = isPage ? { left: 0, right: window.innerWidth, top: 0, bottom: window.innerHeight } : surface.getBoundingClientRect(); const left = Math.max(0, rect.left); const right = Math.min(window.innerWidth, rect.right); const edge = position === "top" ? Math.max(0, rect.top) : Math.min(window.innerHeight, rect.bottom) - barThickness; const rtl = direction ? direction === "rtl" : getComputedStyle(surface).direction === "rtl"; setPlacement((current) => { if (current.left === left && current.top === edge && current.width === right - left && current.rtl === rtl) return current; return { left, top: edge, width: Math.max(0, right - left), rtl }; }); }; const schedule = () => { if (frame) return; frame = requestAnimationFrame(measure); }; const resizeObserver = new ResizeObserver(schedule); const observeContent = () => { resizeObserver.disconnect(); resizeObserver.observe(surface); if (isPage) { resizeObserver.observe(document.documentElement); if (document.body) resizeObserver.observe(document.body); } else { Array.from(surface.children).forEach((child) => resizeObserver.observe(child)); } }; const mutationObserver = new MutationObserver(() => { observeContent(); schedule(); }); mutationObserver.observe(isPage ? document.documentElement : surface, { childList: true, subtree: true }); observeContent(); surface.addEventListener("scroll", schedule, { passive: true }); document.addEventListener("scroll", schedule, { capture: true, passive: true }); window.addEventListener("scroll", schedule, { passive: true }); window.addEventListener("resize", schedule, { passive: true }); measure(); return () => { surface.removeEventListener("scroll", schedule); document.removeEventListener("scroll", schedule, true); window.removeEventListener("scroll", schedule); window.removeEventListener("resize", schedule); resizeObserver.disconnect(); mutationObserver.disconnect(); if (frame) cancelAnimationFrame(frame); }; }, [barThickness, container, direction, position, progress]); return ( ); } 32:Ta83,"use client"; import { useRef } from "react"; import { Card } from "@/components/ui/card"; import { ScrollProgress } from "./scroll-progress"; import { DemoPage, DemoSection } from "../../_shared/variant-frame"; const chapters = [ ["The first layer", "A considered product page gives readers a clear sense of the garment before asking them to choose a size or color."], ["Materials and fit", "Soft cotton, an easy everyday shape, and print that stays comfortable through repeated wear."], ["Care and delivery", "Wash inside out with like colors. Orders are packed carefully and sent with tracking."], ["A note from the studio", "Designed in small runs with the details that make a favorite piece worth keeping."], ]; function ReadingPanel({ position = "top", color }: { position?: "top" | "bottom"; color?: string }) { const scrollRef = useRef(null); return (

Reading time · 2 min

{chapters.map(([title, copy]) => (

{title}

{copy}

))}

); } export function ScrollProgressDemo({ brand }: { brand?: string }) { return (

A longer story, measured from the page.

The page-level bar stays attached to the viewport edge.

); } 33:T552,import type { BlockMeta } from "../../../lib/block-meta"; export const scrollProgressMeta: BlockMeta = { slug: "scroll-progress", title: "Scroll progress", description: "A thin reading indicator that follows page or container scroll position with an optional spring.", group: "effects", kobraDeps: ["card"], files: [ "blocks/effects/scroll-progress/scroll-progress.tsx", "blocks/effects/scroll-progress/demo.tsx", ], props: [ { name: "container", type: "RefObject", description: "Optional scrollable surface to measure." }, { name: "position", type: "'top' | 'bottom'", default: "'top'", description: "Viewport edge where the bar appears." }, { name: "thickness", type: "number", default: "3", description: "Bar height in pixels." }, { name: "color", type: "string", default: "'var(--foreground)'", description: "Fill color, including a theme token." }, { name: "stiffness / damping", type: "number", default: "150 / 28", description: "Spring tuning for scroll changes." }, { name: "direction", type: "'ltr' | 'rtl'", description: "Optional direction override for the fill origin." }, ], tags: ["scroll", "reading", "progress", "motion"], status: "ready", origin: { name: "Original (behavior reference: rareui.com)", url: "https://rareui.com", license: "Original implementation" }, }; 24:["$","article",null,{"className":"grid gap-6","children":[["$","header",null,{"className":"grid gap-3","children":[["$","nav",null,{"aria-label":"breadcrumb","data-slot":"breadcrumb","className":"","children":["$","ol",null,{"data-slot":"breadcrumb-list","className":"flex flex-wrap items-center gap-1.5 text-sm wrap-break-word text-muted-foreground","children":[["$","li",null,{"data-slot":"breadcrumb-item","className":"inline-flex items-center gap-1","children":["$","$L2d",null,{"href":"/","data-slot":"breadcrumb-link","className":"transition-colors hover:text-foreground","children":"Kobra Commerce"}]}],["$","li",null,{"data-slot":"breadcrumb-separator","role":"presentation","aria-hidden":"true","className":"[&>svg]:size-3.5","children":["$","svg",null,{"ref":"$undefined","xmlns":"http://www.w3.org/2000/svg","width":24,"height":24,"viewBox":"0 0 24 24","fill":"none","stroke":"currentColor","strokeWidth":2,"strokeLinecap":"round","strokeLinejoin":"round","className":"tabler-icon tabler-icon-chevron-right rtl:-scale-x-100","children":["$undefined",["$","path","svg-0",{"d":"M9 6l6 6l-6 6"}],"$undefined"]}]}],["$","li",null,{"data-slot":"breadcrumb-item","className":"inline-flex items-center gap-1","children":["$","$L2d",null,{"href":"/#effects","data-slot":"breadcrumb-link","className":"transition-colors hover:text-foreground","children":"Effects"}]}],["$","li",null,{"data-slot":"breadcrumb-separator","role":"presentation","aria-hidden":"true","className":"[&>svg]:size-3.5","children":["$","svg",null,{"ref":"$undefined","xmlns":"http://www.w3.org/2000/svg","width":24,"height":24,"viewBox":"0 0 24 24","fill":"none","stroke":"currentColor","strokeWidth":2,"strokeLinecap":"round","strokeLinejoin":"round","className":"tabler-icon tabler-icon-chevron-right rtl:-scale-x-100","children":["$undefined",["$","path","svg-0",{"d":"M9 6l6 6l-6 6"}],"$undefined"]}]}],["$","li",null,{"data-slot":"breadcrumb-item","className":"inline-flex items-center gap-1","children":["$","span",null,{"data-slot":"breadcrumb-page","role":"link","aria-disabled":"true","aria-current":"page","className":"font-normal text-foreground","children":"Scroll progress"}]}]]}]}],["$","div",null,{"className":"flex flex-wrap items-center gap-3","children":[["$","h1",null,{"className":"text-2xl font-bold","children":"Scroll progress"}],["$","span",null,{"data-slot":"badge","data-variant":"green","className":"group/badge t-label relative isolate inline-flex w-fit shrink-0 items-center justify-center gap-1 rounded-full border border-transparent py-0.5 font-medium [--surface-calm:0.5] whitespace-nowrap transition-ring before:pointer-events-none before:absolute before:inset-0 before:-z-10 before:rounded-[inherit] before:border before:border-transparent before:transition-[scale,background-color,border-color] before:duration-150 before:ease-out focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 motion-reduce:before:transition-none has-data-[icon=inline-end]:pe-1.5 has-data-[icon=inline-start]:ps-1.5 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 [a,button]:active:before:scale-[0.97] motion-reduce:[a,button]:active:before:scale-100 [&>svg]:pointer-events-none [&>svg]:size-3! t-surface t-surface-success text-[var(--badge-green-fg)] h-5 px-1.5 text-xs","children":"Ready"}]]}],["$","p",null,{"className":"max-w-[65ch] text-sm text-muted-foreground","children":"A thin reading indicator that follows page or container scroll position with an optional spring."}]]}],["$","$L2e",null,{"preview":["$","$L2f",null,{"slug":"scroll-progress","group":"effects","minHeight":480,"fixedHeight":"$undefined"}],"code":["$","$L30",null,{"files":[{"path":"blocks/effects/scroll-progress/scroll-progress.tsx","code":"$31"},{"path":"blocks/effects/scroll-progress/demo.tsx","code":"$32"},{"path":"blocks/effects/scroll-progress/meta.ts","code":"$33"}]}],"props":"$L34"}],"$L35"]}]