feat: apercu PDF via PDF.js (rendu portable, build legacy)

Remplace l'<iframe> (lecteur PDF natif du moteur) par un rendu PDF.js
sur <canvas>, une page par canvas empilee et scrollable. Rendu
identique partout (Qt WebEngine, WebView2, navigateur), worker bundle
localement par Vite -> fonctionne hors-ligne.

Utilise le build *legacy* de pdfjs-dist : il embarque les polyfills
requis par les Chromium embarques (Qt WebEngine, WebView2), plus
anciens que Chrome. Le build par defaut appelle
`Map.prototype.getOrInsertComputed` (proposition JS recente) sans
polyfill, ce qui cassait silencieusement le rendu dans la fenetre
bureau. Le catch logue desormais l'erreur au lieu de l'avaler.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "chart.js": "^4.4.1",
+        "pdfjs-dist": "^6.0.227",
         "vue": "^3.4.21",
         "vue-chartjs": "^5.3.0",
         "vue-router": "^4.6.4"
@@ -515,6 +516,271 @@
       "integrity": "sha512-M5UknZPHRu3DEDWoipU6sE8PdkZ6Z/S+v4dD+Ke8IaNlpdSQah50lz1KtcFBa2vsdOnwbbnxJwVM4wty6udA5w==",
       "license": "MIT"
     },
+    "node_modules/@napi-rs/canvas": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas/-/canvas-1.0.0.tgz",
+      "integrity": "sha512-Jqxcy1XOIqj+lH9sl1GT+il6GR3uQv13vI2mrwubP3uT8Olak2ClDrK2RnxlQKjwv8BRr4b3ug0YR7c6hBX8wg==",
+      "license": "MIT",
+      "optional": true,
+      "workspaces": [
+        "e2e/*"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      },
+      "optionalDependencies": {
+        "@napi-rs/canvas-android-arm64": "1.0.0",
+        "@napi-rs/canvas-darwin-arm64": "1.0.0",
+        "@napi-rs/canvas-darwin-x64": "1.0.0",
+        "@napi-rs/canvas-linux-arm-gnueabihf": "1.0.0",
+        "@napi-rs/canvas-linux-arm64-gnu": "1.0.0",
+        "@napi-rs/canvas-linux-arm64-musl": "1.0.0",
+        "@napi-rs/canvas-linux-riscv64-gnu": "1.0.0",
+        "@napi-rs/canvas-linux-x64-gnu": "1.0.0",
+        "@napi-rs/canvas-linux-x64-musl": "1.0.0",
+        "@napi-rs/canvas-win32-arm64-msvc": "1.0.0",
+        "@napi-rs/canvas-win32-x64-msvc": "1.0.0"
+      }
+    },
+    "node_modules/@napi-rs/canvas-android-arm64": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-android-arm64/-/canvas-android-arm64-1.0.0.tgz",
+      "integrity": "sha512-3hNKJObUK7JsCF9aJlVCs1J0/KE/gGfZNeK8MO1ge6bB3aicr5walGme9t9No1f/oyk9GgvdAT/rjSdsx3gbIw==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-darwin-arm64": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-darwin-arm64/-/canvas-darwin-arm64-1.0.0.tgz",
+      "integrity": "sha512-ZIja19/BiGz2puhki+WUYSRriwFeFJ8Mi9eK3hZdSS85w4Y60cuEAJVhMCfKwswQkKkUtrnzdKMBuO7TupvexA==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-darwin-x64": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-darwin-x64/-/canvas-darwin-x64-1.0.0.tgz",
+      "integrity": "sha512-hImggWc82jqZVpEsFR9S7PE9OQYjq/H/D7vwCGB6X1jRH+UVBP1+1niJTPBOat1B154T6GKK7/kcFtoWgjgFzQ==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-arm-gnueabihf": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-arm-gnueabihf/-/canvas-linux-arm-gnueabihf-1.0.0.tgz",
+      "integrity": "sha512-hlJRy6d+kWLKVOG/+1rEvNQVURZ0DxxRPJsLmEWwhwiXZUJc0BF5o9esALHSEP4CoJK4wChRtj3hnyBgVx2oWA==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-arm64-gnu": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-arm64-gnu/-/canvas-linux-arm64-gnu-1.0.0.tgz",
+      "integrity": "sha512-5Hru4T3RXkosRQafcjelv7AUzw9mXqmGYsxnzeDDOWveFCJyEPMSJltvGCM+jfH98seOCbfwm9KyFg6Jm5FhAA==",
+      "cpu": [
+        "arm64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-arm64-musl": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-arm64-musl/-/canvas-linux-arm64-musl-1.0.0.tgz",
+      "integrity": "sha512-LTUl9jS8WsLSUGaxQZKQkxfluOJRpgvBuxxdM4pYcjib+di8AU4OzQc6+L6SzGMLcKc9H0RAjojRatBhTMqYdg==",
+      "cpu": [
+        "arm64"
+      ],
+      "libc": [
+        "musl"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-riscv64-gnu": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-riscv64-gnu/-/canvas-linux-riscv64-gnu-1.0.0.tgz",
+      "integrity": "sha512-Iz931SAZf+WVDzpjk52Q3ffW3zw0YflFwEZMgs036Wfu1kX/LrwT9wGjsuSqyduqefUkl91/vTdAjn8hQu5ezA==",
+      "cpu": [
+        "riscv64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-x64-gnu": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-x64-gnu/-/canvas-linux-x64-gnu-1.0.0.tgz",
+      "integrity": "sha512-pFEQ5eFK4JusgN1K6KkO9DKP/Hi1WMJOkF8Ch03/khTc4bFbCKkCCsJG4YcOMOW9bI4XbT2/eMAWxhO0xaWgPA==",
+      "cpu": [
+        "x64"
+      ],
+      "libc": [
+        "glibc"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-linux-x64-musl": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-linux-x64-musl/-/canvas-linux-x64-musl-1.0.0.tgz",
+      "integrity": "sha512-jnvr8NrLHiZ3NCiOKWqDbkI4Ah+QDrqtZ+sddPZBltEb1mQ2coSvCSJYfict+oAwcm0c970oTmVySpjKP/lnaA==",
+      "cpu": [
+        "x64"
+      ],
+      "libc": [
+        "musl"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-win32-arm64-msvc": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-win32-arm64-msvc/-/canvas-win32-arm64-msvc-1.0.0.tgz",
+      "integrity": "sha512-y2j9/Gfd5joqiqxdP/L1smqjQ+uAx3C4N0EC7bDHrnZEEH8ToM/OC5p3uHvtj4Lq591aHj+ArL01UDLNwT5HgQ==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-win32-x64-msvc": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-win32-x64-msvc/-/canvas-win32-x64-msvc-1.0.0.tgz",
+      "integrity": "sha512-qwdhh9N6Gge/hC4pL9S1tQp0iKwhSl/dYjg7+RGp9k26iRGRi5MqqUyKGOXIWli0zOcuy5Y2wIH/jk2ry6i/jA==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -1680,6 +1946,18 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/pdfjs-dist": {
+      "version": "6.0.227",
+      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-6.0.227.tgz",
+      "integrity": "sha512-/P6M4SXw+70waMVLUM7rdRtvo+dEzqE1t6W/zQNvBETo2MaRa5rrvCcAYdfWGiUzadTgM0lJmRApUrW0d9zgKg==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=22.13.0 || >=24"
+      },
+      "optionalDependencies": {
+        "@napi-rs/canvas": "^1.0.0"
+      }
+    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",

frontend/package.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "chart.js": "^4.4.1",
+    "pdfjs-dist": "^6.0.227",
     "vue": "^3.4.21",
     "vue-chartjs": "^5.3.0",
     "vue-router": "^4.6.4"

frontend/src/components/PdfPreview.vue

@@ -5,63 +5,142 @@
       <span class="text-sm font-medium truncate">{{ fileName }}</span>
     </div>
 
-    <!-- PDF via native browser viewer -->
+    <!-- États -->
-    <iframe
+    <div
-      v-if="pdfUrl"
+      v-if="loading"
-      :src="pdfUrl"
+      class="flex-1 flex items-center justify-center text-gray-400 text-sm"
-      type="application/pdf"
+    >
-      class="flex-1 w-full border-0"
+      Chargement du PDF…
+    </div>
+    <div
+      v-else-if="error"
+      class="flex-1 flex items-center justify-center px-4 text-center text-red-400 text-sm"
+    >
+      {{ error }}
+    </div>
+    <!-- Rendu PDF.js : une <canvas> par page, empilées et scrollables.
+         Ne dépend pas du lecteur PDF natif du moteur (Qt WebEngine,
+         WebView2, navigateur) -> rendu identique partout. -->
+    <div
+      v-else-if="hasSource"
+      ref="container"
+      class="flex-1 overflow-auto p-2 bg-gray-800"
     />
-
     <!-- Empty state -->
-    <div v-else class="flex-1 flex items-center justify-center text-gray-400 text-sm">
+    <div
+      v-else
+      class="flex-1 flex items-center justify-center text-gray-400 text-sm"
+    >
       Aucun PDF sélectionné
     </div>
   </div>
 </template>
 
 <script setup>
-import { ref, watch, onUnmounted } from 'vue'
+import { ref, watch, onUnmounted, nextTick } from 'vue'
+// Build « legacy » (et non le build par défaut) : il embarque les polyfills
+// nécessaires aux moteurs Chromium embarqués (Qt WebEngine, WebView2), plus
+// anciens que la dernière version de Chrome. Le build moderne utilise
+// `Map.prototype.getOrInsertComputed` (proposition JS récente) sans polyfill,
+// ce qui casse le rendu dans la fenêtre bureau. Voir docs pdf.js « legacy ».
+import * as pdfjsLib from 'pdfjs-dist/legacy/build/pdf.mjs'
+import PdfWorker from 'pdfjs-dist/legacy/build/pdf.worker.min.mjs?url'
+
+// Worker bundlé localement par Vite (pas de CDN) -> fonctionne hors-ligne.
+pdfjsLib.GlobalWorkerOptions.workerSrc = PdfWorker
 
 const props = defineProps({
-  file: {
+  file: { type: File, default: null },
-    type: File,
+  url: { type: String, default: null },
-    default: null
+  fileName: { type: String, default: 'document.pdf' }
-  },
-  url: {
-    type: String,
-    default: null
-  },
-  fileName: {
-    type: String,
-    default: 'document.pdf'
-  }
 })
 
-const pdfUrl = ref(null)
+const container = ref(null)
-let objectUrl = null
+const loading = ref(false)
+const error = ref(null)
+const hasSource = ref(false)
 
-function cleanup() {
+let loadingTask = null
-  if (objectUrl) {
+// Jeton de génération : invalide les rendus concurrents (changement de source).
-    URL.revokeObjectURL(objectUrl)
+let renderToken = 0
-    objectUrl = null
+
+async function resolveSource() {
+  if (props.file) return { data: await props.file.arrayBuffer() }
+  if (props.url) return { url: props.url }
+  return null
+}
+
+async function destroyTask() {
+  if (loadingTask) {
+    try {
+      await loadingTask.destroy()
+    } catch {
+      /* ignore */
+    }
+    loadingTask = null
   }
 }
 
-watch([() => props.file, () => props.url], ([newFile, newUrl]) => {
+async function render() {
-  cleanup()
+  const token = ++renderToken
+  error.value = null
+  await destroyTask()
 
-  if (newUrl) {
+  const source = await resolveSource()
-    pdfUrl.value = newUrl
+  hasSource.value = source !== null
-  } else if (newFile) {
+  if (!source) {
-    objectUrl = URL.createObjectURL(newFile)
+    loading.value = false
-    pdfUrl.value = objectUrl
+    return
-  } else {
-    pdfUrl.value = null
   }
-}, { immediate: true })
+
+  loading.value = true
+  try {
+    loadingTask = pdfjsLib.getDocument(source)
+    const doc = await loadingTask.promise
+    if (token !== renderToken) return
+
+    // Le conteneur n'est monté qu'une fois loading=false.
+    loading.value = false
+    await nextTick()
+    const el = container.value
+    if (!el || token !== renderToken) return
+    el.innerHTML = ''
+
+    const targetWidth = Math.max(el.clientWidth - 16, 0)
+    const dpr = window.devicePixelRatio || 1
+
+    for (let n = 1; n <= doc.numPages; n++) {
+      if (token !== renderToken) return
+      const page = await doc.getPage(n)
+      const base = page.getViewport({ scale: 1 })
+      const scale = targetWidth > 0 ? targetWidth / base.width : 1
+      const viewport = page.getViewport({ scale })
+
+      const canvas = document.createElement('canvas')
+      canvas.width = Math.floor(viewport.width * dpr)
+      canvas.height = Math.floor(viewport.height * dpr)
+      canvas.style.width = '100%'
+      canvas.className = 'block mx-auto mb-2 bg-white shadow'
+
+      const ctx = canvas.getContext('2d')
+      ctx.scale(dpr, dpr)
+      await page.render({ canvasContext: ctx, viewport }).promise
+      if (token !== renderToken) return
+      el.appendChild(canvas)
+    }
+  } catch (e) {
+    console.error('[PdfPreview] render error:', e?.message, e)
+    if (token === renderToken) {
+      error.value = "Impossible d'afficher le PDF."
+      loading.value = false
+    }
+  }
+}
+
+watch([() => props.file, () => props.url], render, { immediate: true })
 
 onUnmounted(() => {
-  cleanup()
+  renderToken++
+  destroyTask()
 })
 </script>