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Grabbing a jack // that already carries a patch unplugs it immediately (classic patchbay // behavior — picking up the far end of a live cable disconnects it) and // hands you a loose plug to drop on a new jack or nowhere at all. Every // jack is a real button; Enter/Space "arms" it, a second Enter/Space on a // different jack completes the patch, and pressing the same jack again // cancels — so the whole mechanic is reachable without a pointer. // --------------------------------------------------------------------------- export interface PatchbayJack { id: string; label: string; row: "top" | "bottom"; col: number; // 0-based slot index within its row } export interface AsciiPatchbayProps { /** the patchable jacks */ jacks?: PatchbayJack[]; /** extra classes merged onto the rendered root element */ className?: string; } const DEFAULT_JACKS: PatchbayJack[] = [ { id: "a", label: "A", row: "top", col: 0 }, { id: "b", label: "B", row: "top", col: 1 }, { id: "c", label: "C", row: "top", col: 2 }, { id: "1", label: "1", row: "bottom", col: 0 }, { id: "2", label: "2", row: "bottom", col: 1 }, { id: "3", label: "3", row: "bottom", col: 2 }, ]; const COLS = 26; const ROWS = 12; const CELL_W = 13; const CELL_H = 17; const JACK_W = 3; const JACK_H = 2; const SLOT_GAP = 9; const TOP_ROW = 1; const BOTTOM_ROW = 9; function jackCol(col: number): number { return 1 + col * SLOT_GAP; } function jackRow(row: "top" | "bottom"): number { return row === "top" ? TOP_ROW : BOTTOM_ROW; } // The point just outside the jack's box in its natural cabling direction — // down for a top-row jack, up for a bottom-row one. function anchor(jack: PatchbayJack): [number, number] { const col = jackCol(jack.col) + Math.floor(JACK_W / 2); const row = jack.row === "top" ? jackRow(jack.row) + JACK_H : jackRow(jack.row) - 1; return [col, row]; } // Direction bits and glyph table — identical scheme to diagram-ascii-flow's // shared router, reimplemented here since each component folder is // self-contained (no shared lib file across registry entries). const N = 1; const E = 2; const S = 4; const W = 8; const GLYPH: Record = { 0: " ", 1: "│", 2: "─", 4: "│", 8: "─", 5: "│", 10: "─", 3: "└", 9: "┘", 6: "┌", 12: "┐", 7: "├", 13: "┤", 14: "┬", 11: "┴", 15: "┼", }; function dirBit(dx: number, dy: number): number { if (dx === 1) return E; if (dx === -1) return W; if (dy === 1) return S; if (dy === -1) return N; return 0; } const OPPOSITE: Record = { [N]: S, [S]: N, [E]: W, [W]: E }; // Two-point single-bend orthogonal path: straight if already aligned, else a // vertical-horizontal-vertical jog through the midpoint row — cables drop // out of the jack, jog across, then drop into the target jack. function orthogonalPath(a: [number, number], b: [number, number]): [number, number][] { if (a[0] === b[0] || a[1] === b[1]) return [a, b]; const midY = Math.round((a[1] + b[1]) / 2); return [a, [a[0], midY], [b[0], midY], b]; } function flattenPath(points: [number, number][]): [number, number][] { const cells: [number, number][] = [points[0]]; for (let s = 0; s < points.length - 1; s++) { let [x, y] = points[s]; const [ex, ey] = points[s + 1]; const dx = Math.sign(ex - x); const dy = Math.sign(ey - y); while (x !== ex || y !== ey) { x += dx; y += dy; cells.push([x, y]); } } return cells; } function tracePolyline(points: [number, number][], grid: Map) { for (let s = 0; s < points.length - 1; s++) { let [x, y] = points[s]; const [ex, ey] = points[s + 1]; const dx = Math.sign(ex - x); const dy = Math.sign(ey - y); if (dx !== 0 && dy !== 0) continue; while (x !== ex || y !== ey) { const nx = x + dx; const ny = y + dy; const out = dirBit(dx, dy); const into = OPPOSITE[out]; const k1 = `${x},${y}`; const k2 = `${nx},${ny}`; grid.set(k1, (grid.get(k1) ?? 0) | out); grid.set(k2, (grid.get(k2) ?? 0) | into); x = nx; y = ny; } } } // No JS token reads here on purpose — see diagram-ascii-flow's component.tsx // for the full story. Short version: this component used to hold // getComputedStyle(--foreground/--background/etc) in state and apply it via // inline `style`, and that's a real bug, not a style choice — SSR always // renders with no `document`, so the FIRST markup bakes in the light-theme // fallback hex, and React's hydration does not force a mismatched inline // style property to the client's value the way it does for text content. On // a genuinely dark-themed load, a value that never CHANGES across renders // (this component's own render logic recomputes the same "correct" dark hex // every time) never gets patched into the DOM, because React only writes an // attribute when it differs from the PREVIOUS render's value, not from // what's actually painted — confirmed live, reproducibly, on the sibling // component. Tailwind classes bound to the same custom properties sidestep // the whole bug class: the cascade resolves --background per theme at PAINT // time, no JS or hydration step involved. type Patch = [string, string]; export function AsciiPatchbay({ jacks = DEFAULT_JACKS, className = "" }: AsciiPatchbayProps) { const [patches, setPatches] = useState([ ["a", "2"], ["c", "1"], ]); const [armedId, setArmedId] = useState(null); const [livePointer, setLivePointer] = useState<[number, number] | null>(null); const [hoverId, setHoverId] = useState(null); const containerRef = useRef(null); const draggingRef = useRef(false); const gestureRef = useRef<{ id: string; moved: boolean; ownArm: boolean } | null>(null); const suppressClickRef = useRef(false); const markerRefs = useRef>({}); const reducedRef = useRef(false); useEffect(() => { const mq = window.matchMedia("(prefers-reduced-motion: reduce)"); const sync = () => { reducedRef.current = mq.matches; }; sync(); mq.addEventListener("change", sync); return () => mq.removeEventListener("change", sync); }, []); const byId = useMemo(() => new Map(jacks.map((j) => [j.id, j])), [jacks]); const partnerOf = (id: string) => { for (const [a, b] of patches) { if (a === id) return b; if (b === id) return a; } return null; }; const removePatchFor = (id: string) => { setPatches((cur) => cur.filter(([a, b]) => a !== id && b !== id)); }; const completePatch = (targetId: string, from: string) => { setPatches((cur) => cur.filter(([a, b]) => a !== from && b !== from && a !== targetId && b !== targetId).concat([[from, targetId]])); setArmedId(null); }; const cellFromClientPoint = (clientX: number, clientY: number): [number, number] | null => { const rect = containerRef.current?.getBoundingClientRect(); if (!rect) return null; const x = Math.max(0, Math.min(COLS - 1, Math.round((clientX - rect.left) / CELL_W))); const y = Math.max(0, Math.min(ROWS - 1, Math.round((clientY - rect.top) / CELL_H))); return [x, y]; }; // A gesture's outcome depends on whether the pointer actually moved, not // just on where it started/ended — a plain tap (down+up with no movement, // exactly what a synthetic/keyboard-equivalent click produces) must never // destructively unplug an existing patch; only a real drag-away does. const onJackPointerDown = (jack: PatchbayJack) => (e: React.PointerEvent) => { if (e.button !== 0) return; (e.target as HTMLElement).setPointerCapture(e.pointerId); const ownArm = !armedId; gestureRef.current = { id: jack.id, moved: false, ownArm }; draggingRef.current = true; if (ownArm) { setArmedId(jack.id); setLivePointer(anchor(jack)); } }; const onPointerMove = (e: React.PointerEvent) => { if (!draggingRef.current) return; const g = gestureRef.current; if (g && g.ownArm && !g.moved) { g.moved = true; // first real movement of a fresh pickup: NOW unplug, giving the // dragged cable's far end live visual feedback for the rest of the // gesture rather than silently vanishing at pointerdown. if (partnerOf(g.id)) removePatchFor(g.id); } else if (g) { g.moved = true; } if (armedId) { const cell = cellFromClientPoint(e.clientX, e.clientY); if (cell) setLivePointer(cell); } }; const onPointerUp = (e: React.PointerEvent) => { if (!draggingRef.current) return; draggingRef.current = false; setLivePointer(null); const g = gestureRef.current; gestureRef.current = null; suppressClickRef.current = true; if (!armedId) return; const target = document.elementFromPoint(e.clientX, e.clientY) as HTMLElement | null; const targetId = target?.closest("[data-patchbay-jack]")?.dataset.patchbayJack ?? null; if (targetId && targetId !== armedId) { completePatch(targetId, armedId); } else if (!g?.moved) { // a tap that never moved: stay armed, awaiting a second jack — this is // the two-step click/keyboard flow's first half, not a cancel. return; } else { // a real drag that ended on empty space (or dropped back on itself): // cancel — the plug (already detached, if it had a patch) stays loose. setArmedId(null); } }; const onJackClick = (jack: PatchbayJack) => () => { // reached only via genuine keyboard activation (Enter/Space) — a // pointer-driven click's trailing synthetic click is always suppressed // above, since that whole gesture was already handled in onPointerUp. if (suppressClickRef.current) { suppressClickRef.current = false; return; } if (!armedId) { setArmedId(jack.id); } else if (armedId === jack.id) { setArmedId(null); } else { completePatch(jack.id, armedId); } }; const grid = useMemo(() => { const g = new Map(); for (const [a, b] of patches) { const ja = byId.get(a); const jb = byId.get(b); if (!ja || !jb) continue; tracePolyline(orthogonalPath(anchor(ja), anchor(jb)), g); } if (armedId && livePointer) { const ja = byId.get(armedId); if (ja) tracePolyline(orthogonalPath(anchor(ja), livePointer), g); } return g; }, [patches, byId, armedId, livePointer]); const rows = useMemo(() => { const out: string[] = []; for (let y = 0; y < ROWS; y++) { let line = ""; for (let x = 0; x < COLS; x++) line += GLYPH[grid.get(`${x},${y}`) ?? 0] ?? " "; out.push(line); } return out; }, [grid]); // Pulse: one small rAF loop, only while at least one patch exists and // motion isn't reduced, moving a marker span along each patch's flattened // cell path directly via refs (no per-frame React state). useEffect(() => { if (reducedRef.current || patches.length === 0) return; const paths = patches.map(([a, b]) => { const ja = byId.get(a); const jb = byId.get(b); return ja && jb ? flattenPath(orthogonalPath(anchor(ja), anchor(jb))) : []; }); let raf = 0; const period = 1400; const start = performance.now(); const tick = (now: number) => { const frac = ((now - start) % period) / period; paths.forEach((cells, i) => { const marker = markerRefs.current[i]; if (!marker || cells.length === 0) return; const idx = Math.min(cells.length - 1, Math.floor(frac * cells.length)); const [cx, cy] = cells[idx]; marker.style.left = `${cx * CELL_W}px`; marker.style.top = `${cy * CELL_H}px`; }); raf = requestAnimationFrame(tick); }; raf = requestAnimationFrame(tick); return () => cancelAnimationFrame(raf); }, [patches, byId]); return (

{rows.map((line, y) => (

{line.split("").map((ch, x) => ( {ch} ))}

))}

{patches.map(([a], i) => ( { markerRefs.current[i] = el; }} aria-hidden className="ns-pac-pulse pointer-events-none absolute rounded-full bg-ns-accent" style={{ width: 6, height: 6, marginLeft: CELL_W / 2 - 3, marginTop: CELL_H / 2 - 3 }} /> ))} {jacks.map((jack) => { const col = jackCol(jack.col); const row = jackRow(jack.row); const armed = armedId === jack.id; const patched = !!partnerOf(jack.id); const hovered = hoverId === jack.id; return ( ); })}

{armedId ? ( Armed: {byId.get(armedId)?.label} — select another jack to patch, or press Escape to cancel. ) : ( Drag from one jack to another to patch them, or press Enter to arm. )}

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