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feat: resizable workbench & timeline panels (react-resizable-panels) #31

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Merged
hoce1n merged 1 commit into from
Aug 12, 2026
Merged

feat: resizable workbench & timeline panels (react-resizable-panels) #31

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183 changes: 108 additions & 75 deletions src/components/devtools/Timeline.tsx
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Original file line number Diff line number Diff line change
@@ -1,7 +1,10 @@
import { useCallback, useEffect, useRef, useState, type KeyboardEvent } from "react";
import { Check, ChevronRight, Play } from "lucide-react";
import { Group, Panel, Separator, useDefaultLayout } from "react-resizable-panels";
import { ERAS, type Concept } from "@/lib/js-eras";
import { getProgress, isConceptDone, toggleConcept } from "@/lib/progress";
import { panelLayoutStorage } from "@/lib/panel-layout";
import { useMediaQuery } from "@/hooks/use-media-query";
import { CodeBlock } from "./CodeBlock";
import { CopyButton } from "./CopyButton";

Expand Down Expand Up @@ -59,13 +62,19 @@ export function Timeline({
const era = ERAS.find((e) => e.id === activeEra) ?? ERAS[0]!;
const railRef = useRef<HTMLElement | null>(null);
const { done, total, toggle } = useConceptProgress();
const isWide = useMediaQuery("(min-width: 768px)");
const { defaultLayout, onLayoutChanged } = useDefaultLayout({
id: "timeline-split",
panelIds: ["timeline-rail", "timeline-content"],
storage: panelLayoutStorage,
});

const onRailKeyDown = (e: KeyboardEvent<HTMLElement>) => {
if (e.key !== "ArrowUp" && e.key !== "ArrowDown" && e.key !== "Home" && e.key !== "End") {
return;
}
const buttons = Array.from(
railRef.current?.querySelectorAll<HTMLButtonElement>('[data-era]') ?? [],
railRef.current?.querySelectorAll<HTMLButtonElement>("[data-era]") ?? [],
);
const current = buttons.findIndex((b) => b.dataset["era"] === era.id);
if (current === -1 || buttons.length === 0) return;
Expand All @@ -82,83 +91,107 @@ export function Timeline({
onSelectEra(id);
};

return (
<div className="grid gap-px bg-border md:grid-cols-[220px_1fr]">
{/* era rail */}
<nav
ref={railRef}
onKeyDown={onRailKeyDown}
className="bg-panel p-2"
aria-label="JavaScript eras"
>
<p className="flex items-baseline justify-between gap-2 px-2 pb-2 pt-1 text-[10.5px] uppercase tracking-widest text-muted-foreground">
<span>Timeline</span>
<span className="normal-case tracking-normal">
{done.size} / {total} concepts
</span>
</p>
<ol className="space-y-px">
{ERAS.map((e, i) => {
const active = e.id === era.id;
return (
<li key={e.id}>
<button
onClick={() => onSelectEra(e.id)}
data-era={e.id}
aria-current={active ? "true" : undefined}
className={`flex w-full items-center gap-2 border-l-2 px-2.5 py-2 text-left text-xs transition-colors ${
active
? "border-l-primary bg-accent text-foreground"
: "border-l-transparent text-muted-foreground hover:bg-accent/50 hover:text-foreground active:bg-accent/70"
}`}
>
<span className="w-4 shrink-0 text-[10px] text-muted-foreground">
{String(i).padStart(2, "0")}
</span>
<span className="min-w-0 flex-1">
<span className="block truncate font-medium">{e.label}</span>
<span className="block truncate text-[10.5px] text-muted-foreground">
{e.years}
</span>
const railBody = (
<nav
ref={railRef}
onKeyDown={onRailKeyDown}
className="bg-panel p-2"
aria-label="JavaScript eras"
>
<p className="flex items-baseline justify-between gap-2 px-2 pb-2 pt-1 text-[10.5px] uppercase tracking-widest text-muted-foreground">
<span>Timeline</span>
<span className="normal-case tracking-normal">
{done.size} / {total} concepts
</span>
</p>
<ol className="space-y-px">
{ERAS.map((e, i) => {
const active = e.id === era.id;
return (
<li key={e.id}>
<button
onClick={() => onSelectEra(e.id)}
data-era={e.id}
aria-current={active ? "true" : undefined}
className={`flex w-full items-center gap-2 border-l-2 px-2.5 py-2 text-left text-xs transition-colors ${
active
? "border-l-primary bg-accent text-foreground"
: "border-l-transparent text-muted-foreground hover:bg-accent/50 hover:text-foreground active:bg-accent/70"
}`}
>
<span className="w-4 shrink-0 text-[10px] text-muted-foreground">
{String(i).padStart(2, "0")}
</span>
<span className="min-w-0 flex-1">
<span className="block truncate font-medium">{e.label}</span>
<span className="block truncate text-[10.5px] text-muted-foreground">
{e.years}
</span>
</button>
</li>
);
})}
</ol>
</nav>

{/* era detail */}
<div className="bg-card">
<article key={era.id} className="p-5 md:p-7">
<header className="border-b border-border pb-5">
<div className="flex flex-wrap items-baseline gap-3">
<h2 className="text-xl font-bold text-primary">{era.label}</h2>
<span className="rounded-sm border border-secondary/50 px-1.5 py-0.5 text-[10.5px] text-secondary">
{era.spec}
</span>
<span className="text-xs text-muted-foreground">{era.years}</span>
</div>
<p className="mt-3 max-w-3xl text-sm leading-relaxed text-panel-foreground">
{era.summary}
</p>
</header>
</span>
</button>
</li>
);
})}
</ol>
</nav>
);

<div className="divide-y divide-border">
{era.concepts.map((concept) => (
<ConceptRow
key={concept.id}
concept={concept}
open={expandedConcept === concept.id}
done={done.has(concept.id)}
onMark={() => toggle(concept.id)}
onToggle={() => onToggleConcept(expandedConcept === concept.id ? null : concept.id)}
onRun={onRun}
/>
))}
const contentBody = (
<div className="bg-card">
<article key={era.id} className="p-5 md:p-7">
<header className="border-b border-border pb-5">
<div className="flex flex-wrap items-baseline gap-3">
<h2 className="text-xl font-bold text-primary">{era.label}</h2>
<span className="rounded-sm border border-secondary/50 px-1.5 py-0.5 text-[10.5px] text-secondary">
{era.spec}
</span>
<span className="text-xs text-muted-foreground">{era.years}</span>
</div>
</article>
</div>
<p className="mt-3 max-w-3xl text-sm leading-relaxed text-panel-foreground">
{era.summary}
</p>
</header>

<div className="divide-y divide-border">
{era.concepts.map((concept) => (
<ConceptRow
key={concept.id}
concept={concept}
open={expandedConcept === concept.id}
done={done.has(concept.id)}
onMark={() => toggle(concept.id)}
onToggle={() => onToggleConcept(expandedConcept === concept.id ? null : concept.id)}
onRun={onRun}
/>
))}
</div>
</article>
</div>
);

if (isWide) {
return (
<Group
orientation="horizontal"
defaultLayout={defaultLayout}
onLayoutChanged={onLayoutChanged}
resizeTargetMinimumSize={{ coarse: 20, fine: 8 }}
>
<Panel id="timeline-rail" defaultSize={220} minSize={140} maxSize={480}>
{railBody}
</Panel>
<Separator className="w-px shrink-0 bg-border transition-colors data-[separator=hover]:bg-secondary/70 data-[separator=active]:bg-secondary" />
<Panel id="timeline-content" minSize="25">
{contentBody}
</Panel>
</Group>
);
}

return (
<div className="grid gap-px bg-border">
{railBody}
{contentBody}
</div>
);
}
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