deploy: add single-barcode printing to Code Lab

packages/fieldlens-core/src/features/codes/CodeLab.css

@@ -144,4 +144,102 @@
   .ean-lab-fields b {
     font-size: 5.8px;
   }
-}
+}
+
+.code-card-heading-actions {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+}
+
+.code-print-button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: 5px;
+  min-height: 30px;
+  padding: 0 9px;
+  border: 1px solid var(--line);
+  border-radius: 5px;
+  color: var(--ink);
+  background: #fff;
+  font-size: 9px;
+  font-weight: 900;
+  white-space: nowrap;
+}
+
+.code-print-button:hover {
+  border-color: #c9a72d;
+  background: #fff8d7;
+}
+
+.barcode-print-sheet {
+  display: none;
+}
+
+@media print {
+  @page {
+    margin: 12mm;
+  }
+
+  body * {
+    visibility: hidden !important;
+  }
+
+  .barcode-print-sheet,
+  .barcode-print-sheet * {
+    visibility: visible !important;
+  }
+
+  .barcode-print-sheet {
+    position: fixed;
+    inset: 0;
+    display: grid !important;
+    place-items: center;
+    padding: 0;
+    background: #fff;
+  }
+
+  .barcode-print-label {
+    display: grid;
+    width: min(170mm, 100%);
+    place-items: center;
+    gap: 8mm;
+    color: #000;
+    background: #fff;
+    text-align: center;
+  }
+
+  .barcode-print-label strong {
+    font: 700 14pt/1.2 Arial, Helvetica, sans-serif;
+  }
+
+  .barcode-print-label canvas {
+    display: block;
+    max-width: 100%;
+    height: auto;
+  }
+
+  .barcode-print-label code {
+    max-width: 100%;
+    overflow-wrap: anywhere;
+    color: #000;
+    font: 11pt/1.3 "Courier New", monospace;
+  }
+}
+
+@media (max-width: 760px) {
+  .code-card-heading {
+    align-items: flex-start;
+  }
+
+  .code-card-heading-actions {
+    align-items: flex-end;
+    flex-direction: column;
+    gap: 5px;
+  }
+
+  .code-print-button {
+    min-height: 29px;
+  }
+}

packages/fieldlens-core/src/features/codes/CodeLab.tsx

@@ -1,5 +1,5 @@
 import bwipjs from 'bwip-js'
-import { RefreshCw } from 'lucide-react'
+import { Printer, RefreshCw } from 'lucide-react'
 import { useEffect, useRef, useState } from 'react'
 
 import { appendGtinCheckDigit, randomDigits } from '../../lib/barcodes'
@@ -65,23 +65,27 @@ function makeEanFixtures(): EanLabelFixture[] {
   }))
 }
 
-function CodeCard({ fixture }: { fixture: CodeFixture }) {
+function drawBarcode(canvas: HTMLCanvasElement, fixture: CodeFixture, print = false) {
+  bwipjs.toCanvas(canvas, {
+    bcid: fixture.bcid,
+    text: fixture.value,
+    scale: print ? 5 : 3,
+    height: fixture.bcid === 'qrcode' ? (print ? 34 : 24) : (print ? 20 : 13),
+    includetext: fixture.bcid !== 'qrcode',
+    textxalign: 'center',
+    backgroundcolor: 'FFFFFF',
+    paddingwidth: print ? 12 : 8,
+    paddingheight: print ? 12 : 8,
+  })
+}
+
+function CodeCard({ fixture, onPrint }: { fixture: CodeFixture; onPrint: (fixture: CodeFixture) => void }) {
   const canvasRef = useRef<HTMLCanvasElement>(null)
 
   useEffect(() => {
     if (!canvasRef.current) return
     try {
-      bwipjs.toCanvas(canvasRef.current, {
+      drawBarcode(canvasRef.current, fixture)
-        bcid: fixture.bcid,
-        text: fixture.value,
-        scale: 3,
-        height: fixture.bcid === 'qrcode' ? 24 : 13,
-        includetext: fixture.bcid !== 'qrcode',
-        textxalign: 'center',
-        backgroundcolor: 'FFFFFF',
-        paddingwidth: 8,
-        paddingheight: 8,
-      })
     } catch {
       // A failed fixture remains labeled so generator errors are visible during testing.
     }
@@ -89,13 +93,44 @@ function CodeCard({ fixture }: { fixture: CodeFixture }) {
 
   return (
     <article className="code-card">
-      <div className="code-card-heading"><strong>{fixture.name}</strong><span>VALID SAMPLE</span></div>
+      <div className="code-card-heading">
+        <strong>{fixture.name}</strong>
+        <div className="code-card-heading-actions">
+          <span>VALID SAMPLE</span>
+          <button className="code-print-button" type="button" onClick={() => onPrint(fixture)} aria-label={`Print one ${fixture.name} barcode`}>
+            <Printer size={14} /> Print one
+          </button>
+        </div>
+      </div>
       <div className="barcode-canvas"><canvas ref={canvasRef} /></div>
       <code>{fixture.value}</code>
     </article>
   )
 }
 
+function PrintableBarcode({ fixture }: { fixture: CodeFixture }) {
+  const canvasRef = useRef<HTMLCanvasElement>(null)
+
+  useEffect(() => {
+    if (!canvasRef.current) return
+    try {
+      drawBarcode(canvasRef.current, fixture, true)
+    } catch {
+      // Keep the value visible if rendering fails so the print is diagnosable.
+    }
+  }, [fixture])
+
+  return (
+    <div className="barcode-print-sheet" aria-hidden="true">
+      <div className="barcode-print-label">
+        <strong>{fixture.name}</strong>
+        <canvas ref={canvasRef} />
+        <code>{fixture.value}</code>
+      </div>
+    </div>
+  )
+}
+
 function EanLabelCard({ fixture }: { fixture: EanLabelFixture }) {
   return (
     <article className="ean-lab-carton">
@@ -126,12 +161,35 @@ export function CodeLab() {
   const [tab, setTab] = useState<LabTab>('barcodes')
   const [fixtures, setFixtures] = useState(makeFixtures)
   const [eanFixtures, setEanFixtures] = useState(makeEanFixtures)
+  const [printFixture, setPrintFixture] = useState<CodeFixture | null>(null)
 
   const regenerate = () => {
     if (tab === 'ean') setEanFixtures(makeEanFixtures())
     else setFixtures(makeFixtures())
   }
 
+  useEffect(() => {
+    if (!printFixture) return
+
+    let cancelled = false
+    let frameTwo = 0
+    const clearPrintFixture = () => setPrintFixture(null)
+    window.addEventListener('afterprint', clearPrintFixture, { once: true })
+
+    const frameOne = window.requestAnimationFrame(() => {
+      frameTwo = window.requestAnimationFrame(() => {
+        if (!cancelled) window.print()
+      })
+    })
+
+    return () => {
+      cancelled = true
+      window.cancelAnimationFrame(frameOne)
+      if (frameTwo) window.cancelAnimationFrame(frameTwo)
+      window.removeEventListener('afterprint', clearPrintFixture)
+    }
+  }, [printFixture])
+
   return (
     <section className="workspace-view code-lab" aria-labelledby="lab-title">
       <header className="view-heading">
@@ -153,10 +211,11 @@ export function CodeLab() {
       </div>
 
       {tab === 'barcodes' ? (
-        <div className="code-grid">{fixtures.map((fixture) => <CodeCard fixture={fixture} key={fixture.id} />)}</div>
+        <div className="code-grid">{fixtures.map((fixture) => <CodeCard fixture={fixture} key={fixture.id} onPrint={setPrintFixture} />)}</div>
       ) : (
         <div className="ean-lab-grid">{eanFixtures.map((fixture) => <EanLabelCard fixture={fixture} key={fixture.id} />)}</div>
       )}
+      {printFixture && <PrintableBarcode fixture={printFixture} />}
     </section>
   )
 }