Own it · example handover · app/
src/ui/app.tsx
← All files · the demo this builds
/**
* The Spreadsheet Rescue demo: the broken workbook and the rebuilt app in
* one frame, a wipe handle between them, five tour stops underneath, and
* the downloadable .xlsx generated in-browser from the same description
* that renders the grid.
*/
import { useEffect, useMemo, useRef, useState } from "preact/hooks";
import { DEMO_SEED, makeGsmDemo, type WbCell } from "@portfolio/fabricator";
import { Grid, displayValue } from "./grid.js";
import { Rebuilt, type AppFocus, type AppView } from "./rebuilt.js";
import { workbookToXlsx } from "../xlsx/xlsx.js";
interface TourStop {
key: string;
label: string;
sheet: number;
cell: string;
view: AppView;
focus: AppFocus;
caption: string;
revealsHidden?: boolean;
}
const reduceMotion = () =>
typeof matchMedia !== "undefined" && matchMedia("(prefers-reduced-motion: reduce)").matches;
export function App() {
const demo = useMemo(() => makeGsmDemo(DEMO_SEED, new Date()), []);
const wb = demo.workbook;
const lm = demo.landmarks;
const [wipe, setWipe] = useState(reduceMotion() ? 50 : 2);
const [sheetIdx, setSheetIdx] = useState(wb.activeSheet);
const [selected, setSelected] = useState<string | null>(null);
const [hiddenRevealed, setHiddenRevealed] = useState(false);
const [stopIdx, setStopIdx] = useState<number | null>(null);
const [appView, setAppView] = useState<AppView>("jobs");
const [appFocus, setAppFocus] = useState<AppFocus>(null);
const [dl, setDl] = useState<"idle" | "busy" | "done">("idle");
const frameRef = useRef<HTMLDivElement>(null);
const beforeScrollRef = useRef<HTMLDivElement>(null);
const userTouched = useRef(false);
const sheet = wb.sheets[sheetIdx]!;
const selectedCell: WbCell | undefined = selected ? sheet.cells[selected] : undefined;
const stops: TourStop[] = useMemo(
() => [
{
key: "ref",
label: "#REF!",
sheet: lm.jobsSheet,
cell: lm.refCell,
view: "jobs",
focus: "total",
caption:
"Somebody deleted the Deposit column; every Balance formula written before that week now reads =H–I–#REF!. Tap the cell — the wreck is in the formula bar, not painted on. On the right, balances are computed from the data, so there's nothing left to dangle.",
},
{
key: "hidden",
label: "the hidden tab",
sheet: lm.hiddenSheet,
cell: "A1",
view: "jobs",
focus: "recovered",
caption:
"“Mike's copy” — hidden, forked, in his own column layout, holding six service contracts that exist nowhere else. Mike left two years ago. The rebuild surfaces his six jobs with a badge instead of leaving them buried in a tab nobody knows is there.",
revealsHidden: true,
},
{
key: "merge",
label: "merged cells",
sheet: lm.scheduleSheet,
cell: lm.mergeCell,
view: "schedule",
focus: null,
caption:
"The crew names are merged across rows because it looked tidy — and now sorting the schedule shreds it, so nobody dares. The rebuild keeps schedule and structure separate: real rows, a real grid, sort all you like.",
},
{
key: "dates",
label: "date soup",
sheet: lm.jobsSheet,
cell: lm.dateSoupCell,
view: "jobs",
focus: "dates",
caption:
"One Start column, four date formats — real dates, “6/3”, “June 3rd”, one with a trailing space — typed by whoever was fastest. Half of them won't sort and won't add up. The rebuild stores one format and prints one format.",
},
{
key: "po",
label: "the mid-year column",
sheet: lm.jobsSheet,
cell: lm.poHeaderCell,
view: "jobs",
focus: "po",
caption:
"PO # was wedged in this spring, so every older row is blank and every older formula quietly ignores the column — including the Total at the bottom, which somebody typed in by hand and hasn't matched its own column since. In the rebuild, PO is a field on every job and the total is computed, every time.",
},
],
[lm],
);
// one slow auto-wipe on mount, then park mid-screen for the thumb
useEffect(() => {
if (reduceMotion()) return;
let raf = 0;
const t0 = performance.now();
const tick = (t: number) => {
if (userTouched.current) return;
const el = (t - t0) / 1000;
let v: number;
if (el < 1.6) v = 2 + (el / 1.6) * 94; // sweep to 96
else if (el < 2.5) v = 96 - ((el - 1.6) / 0.9) * 46; // back to 50
else {
setWipe(50);
return;
}
setWipe(v);
raf = requestAnimationFrame(tick);
};
raf = requestAnimationFrame(tick);
return () => cancelAnimationFrame(raf);
}, []);
const dragTo = (clientX: number) => {
const frame = frameRef.current;
if (!frame) return;
const rect = frame.getBoundingClientRect();
const pct = ((clientX - rect.left) / rect.width) * 100;
setWipe(Math.max(0, Math.min(100, pct)));
};
const onPointerDown = (e: PointerEvent) => {
userTouched.current = true;
(e.currentTarget as HTMLElement).setPointerCapture(e.pointerId);
dragTo(e.clientX);
};
const onPointerMove = (e: PointerEvent) => {
if ((e.currentTarget as HTMLElement).hasPointerCapture(e.pointerId)) dragTo(e.clientX);
};
const onPointerUp = () => {
// gentle snap at the meaningful positions
setWipe((w) => (Math.abs(w - 50) < 7 ? 50 : w < 7 ? 0 : w > 93 ? 100 : w));
};
const goToStop = (i: number) => {
const s = stops[i]!;
userTouched.current = true;
setStopIdx(i);
if (s.revealsHidden) setHiddenRevealed(true);
setSheetIdx(s.sheet);
setSelected(s.cell);
setWipe(50);
setAppView(s.view);
setAppFocus(s.focus);
// scroll the grid to the cell once it's rendered
requestAnimationFrame(() => {
const box = beforeScrollRef.current;
const cell = box?.querySelector<HTMLElement>(`[data-addr="${s.cell}"]`);
if (box && cell) {
box.scrollTo({
left: Math.max(0, cell.offsetLeft - box.clientWidth / 3),
top: Math.max(0, cell.offsetTop - box.clientHeight / 3),
behavior: reduceMotion() ? "auto" : "smooth",
});
}
});
};
const download = async () => {
setDl("busy");
try {
const bytes = await workbookToXlsx(wb, new Date());
const blob = new Blob([bytes as unknown as BlobPart], {
type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
});
const url = URL.createObjectURL(blob);
const a = document.createElement("a");
a.href = url;
a.download = "granite-state-mechanical-job-board.xlsx";
a.click();
setTimeout(() => URL.revokeObjectURL(url), 4000);
setDl("done");
} catch {
setDl("idle");
}
};
const visibleSheets = wb.sheets
.map((s, i) => ({ s, i }))
.filter(({ s }) => !s.hidden || hiddenRevealed);
return (
<div class="ssr">
<p class="ssr-kicker">
Granite State Mechanical is fictional; this workbook breaks the way real ones do. Drag the
handle — same jobs on both sides.
</p>
<div class="ssr-frame" ref={frameRef}>
<div class="ssr-before" aria-label="The workbook as it is today">
<div class="ssr-fxbar">
<span class="ssr-namebox">{selected ?? ""}</span>
<span class="ssr-fx">fx</span>
<span class="ssr-formula">
{selectedCell?.f
? `=${selectedCell.f}`
: displayValue(selectedCell?.v, selectedCell?.t, selectedCell?.s ? wb.styles[selectedCell.s] : undefined)}
</span>
</div>
<div class="ssr-sheetwrap" ref={beforeScrollRef}>
<Grid sheet={sheet} styles={wb.styles} selected={selected} onSelect={setSelected} />
</div>
<div class="ssr-tabs" role="tablist" aria-label="Workbook tabs">
{visibleSheets.map(({ s, i }) => (
<button
type="button"
role="tab"
aria-selected={i === sheetIdx}
class={`ssr-tab ${i === sheetIdx ? "is-active" : ""} ${s.hidden ? "was-hidden" : ""}`}
onClick={() => {
setSheetIdx(i);
setSelected(null);
}}
>
{s.name}
</button>
))}
{!hiddenRevealed && (
<button type="button" class="ssr-tab ssr-unhide" onClick={() => setHiddenRevealed(true)} title="Unhide…">
1 hidden…
</button>
)}
</div>
</div>
<div class="ssr-after" style={{ clipPath: `inset(0 0 0 ${wipe}%)` }} aria-label="The rebuilt app over the same jobs">
<Rebuilt data={demo.data} view={appView} onView={setAppView} focus={appFocus} />
</div>
<div
class="ssr-handle"
style={{ left: `${wipe}%` }}
role="slider"
aria-label="Reveal the rebuilt app"
aria-valuemin={0}
aria-valuemax={100}
aria-valuenow={Math.round(wipe)}
tabIndex={0}
onPointerDown={onPointerDown}
onPointerMove={onPointerMove}
onPointerUp={onPointerUp}
onKeyDown={(e) => {
userTouched.current = true;
if (e.key === "ArrowLeft") setWipe((w) => Math.max(0, w - 5));
if (e.key === "ArrowRight") setWipe((w) => Math.min(100, w + 5));
if (e.key === "Home") setWipe(0);
if (e.key === "End") setWipe(100);
}}
>
<span class="ssr-grip" aria-hidden="true">⇿</span>
</div>
<span class="ssr-chip ssr-chip-left" aria-hidden="true">their workbook</span>
<span class="ssr-chip ssr-chip-right" aria-hidden="true">the rebuild</span>
</div>
<div class="ssr-tour" role="group" aria-label="Tour the damage">
{stops.map((s, i) => (
<button type="button" class={`ssr-stop ${stopIdx === i ? "is-on" : ""}`} onClick={() => goToStop(i)}>
{s.label}
</button>
))}
</div>
<p class="ssr-caption" aria-live="polite">
{stopIdx === null
? "Five of this workbook's wounds are marked above. Tap one — both sides jump to it, wound on the left, fix on the right."
: stops[stopIdx]!.caption}
</p>
<div class="ssr-foot">
<button type="button" class="ssr-dl" data-ctx="download" onClick={download} disabled={dl === "busy"}>
{dl === "busy" ? "Building the file in your browser…" : "Download the broken workbook — open it yourself."}
</button>
<p class="ssr-dl-note" data-ctx="download">
It's a realistic sample; no client's real numbers on this site. Generated in your browser
just now from the same data as the demo — hidden tab actually hidden, broken formulas
actually broken.{dl === "done" ? " Sent to your downloads." : ""}
</p>
</div>
</div>
);
}