Art: full-image thumbnails, detail page with copy-to-clipboard

- gallery thumbnails now object-fit: contain (whole image, letterboxed),
  and a card links to the new detail page instead of the raw file
- /art/{id} detail page: large uncropped image, "Open full size",
  "Delete" (moved here from the gallery), and "Copy image"
- clipboard Stimulus controller copies the image to the OS clipboard
  (converts non-PNG via canvas) for pasting into WhatsApp etc.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

assets/controllers/clipboard_controller.js

@@ -0,0 +1,70 @@
+import { Controller } from '@hotwired/stimulus';
+
+/*
+ * Copies an image to the OS clipboard so it can be pasted into WhatsApp etc.
+ *
+ *   <button data-controller="clipboard"
+ *           data-clipboard-url-value="/art/5/file"
+ *           data-action="clipboard#copy">Copy image</button>
+ *
+ * The Clipboard API only reliably accepts image/png, so non-PNG sources are
+ * redrawn through a canvas first. Needs a secure context (https or localhost).
+ */
+export default class extends Controller {
+    static values = { url: String };
+
+    async copy(event) {
+        const btn = event.currentTarget;
+
+        if (!navigator.clipboard || !window.ClipboardItem) {
+            this.flash(btn, 'Not supported');
+            return;
+        }
+
+        this.flash(btn, 'Copying…', 0);
+        try {
+            const res = await fetch(this.urlValue, { credentials: 'same-origin' });
+            if (!res.ok) throw new Error(`HTTP ${res.status}`);
+            let blob = await res.blob();
+            if (blob.type !== 'image/png') {
+                blob = await this.toPng(blob);
+            }
+            await navigator.clipboard.write([new ClipboardItem({ 'image/png': blob })]);
+            this.flash(btn, 'Copied!');
+        } catch (e) {
+            console.error('clipboard copy failed', e);
+            this.flash(btn, 'Copy failed');
+        }
+    }
+
+    toPng(blob) {
+        return new Promise((resolve, reject) => {
+            const img = new Image();
+            const url = URL.createObjectURL(blob);
+            img.onload = () => {
+                URL.revokeObjectURL(url);
+                const canvas = document.createElement('canvas');
+                canvas.width = img.naturalWidth;
+                canvas.height = img.naturalHeight;
+                canvas.getContext('2d').drawImage(img, 0, 0);
+                canvas.toBlob((b) => (b ? resolve(b) : reject(new Error('toBlob failed'))), 'image/png');
+            };
+            img.onerror = () => {
+                URL.revokeObjectURL(url);
+                reject(new Error('image decode failed'));
+            };
+            img.src = url;
+        });
+    }
+
+    flash(btn, msg, revertAfter = 1800) {
+        if (!btn.dataset.label) btn.dataset.label = btn.textContent;
+        btn.textContent = msg;
+        clearTimeout(this._t);
+        if (revertAfter > 0) {
+            this._t = setTimeout(() => {
+                btn.textContent = btn.dataset.label;
+            }, revertAfter);
+        }
+    }
+}

assets/styles/app.css

@@ -89,3 +89,26 @@ table.dataTable {
 .ft-amp {
     color: var(--bs-secondary-color);
 }
+
+/* --- Art gallery ------------------------------------------------------- */
+.art-thumb {
+    height: 180px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 0.4rem;
+    background: var(--bs-tertiary-bg);
+    border-bottom: 1px solid var(--bs-border-color);
+    border-top-left-radius: inherit;
+    border-top-right-radius: inherit;
+    overflow: hidden;
+}
+.art-thumb img {
+    max-width: 100%;
+    max-height: 100%;
+    object-fit: contain;   /* whole image, never cropped */
+}
+.art-full img {
+    max-width: 100%;
+    height: auto;
+}

src/Controller/ArtController.php

@@ -74,6 +74,12 @@ class ArtController extends AbstractController
         return $this->render('art/upload.html.twig', ['form' => $form]);
     }
 
+    #[Route('/art/{id}', name: 'app_art_show', requirements: ['id' => '\d+'], methods: ['GET'])]
+    public function show(Artwork $artwork): Response
+    {
+        return $this->render('art/show.html.twig', ['art' => $artwork]);
+    }
+
     #[Route('/art/{id}/file', name: 'app_art_file', requirements: ['id' => '\d+'], methods: ['GET'])]
     public function serve(Artwork $artwork): BinaryFileResponse
     {

templates/art/index.html.twig

@@ -18,26 +18,17 @@
         <div class="row row-cols-1 row-cols-sm-2 row-cols-md-3 row-cols-lg-4 g-3">
             {% for art in artworks %}
                 <div class="col">
-                    <div class="card shadow-sm h-100">
+                    <a href="{{ path('app_art_show', {id: art.id}) }}" class="card shadow-sm h-100 text-decoration-none text-body">
-                        <a href="{{ path('app_art_file', {id: art.id}) }}" target="_blank" rel="noopener">
+                        <div class="art-thumb">
-                            <img src="{{ path('app_art_file', {id: art.id}) }}" alt="{{ art.name }}"
+                            <img src="{{ path('app_art_file', {id: art.id}) }}" alt="{{ art.name }}" loading="lazy">
-                                 class="card-img-top object-fit-cover" style="height: 180px;"
-                                 loading="lazy">
-                        </a>
-                        <div class="card-body py-2 d-flex justify-content-between align-items-start gap-2">
-                            <div class="min-w-0">
-                                <div class="fw-semibold text-truncate" title="{{ art.name }}">{{ art.name }}</div>
-                                <div class="text-body-secondary small">
-                                    {{ art.uploadedAt|date('Y-m-d') }} · {{ (art.size / 1024)|round }} KB
-                                </div>
-                            </div>
-                            <form method="post" action="{{ path('app_art_delete', {id: art.id}) }}"
-                                  onsubmit="return confirm('Delete “{{ art.name|e('js') }}”?')">
-                                <input type="hidden" name="_token" value="{{ csrf_token('delete-art-' ~ art.id) }}">
-                                <button class="btn btn-sm btn-outline-danger" title="Delete">&times;</button>
-                            </form>
                         </div>
-                    </div>
+                        <div class="card-body py-2">
+                            <div class="fw-semibold text-truncate" title="{{ art.name }}">{{ art.name }}</div>
+                            <div class="text-body-secondary small">
+                                {{ art.uploadedAt|date('Y-m-d') }} · {{ (art.size / 1024)|round }} KB
+                            </div>
+                        </div>
+                    </a>
                 </div>
             {% endfor %}
         </div>

templates/art/show.html.twig

@@ -0,0 +1,38 @@
+{% extends 'base.html.twig' %}
+
+{% block title %}{{ art.name }} · Art · dmtools{% endblock %}
+
+{% block body %}
+    <div class="d-flex justify-content-between align-items-start mb-3 gap-3 flex-wrap">
+        <div>
+            <a href="{{ path('app_art') }}" class="text-decoration-none small">&larr; Art</a>
+            <h1 class="h3 mb-0">{{ art.name }}</h1>
+            <span class="text-body-secondary small">
+                {{ art.uploadedAt|date('Y-m-d H:i') }} · {{ (art.size / 1024)|round }} KB
+                {%- if art.originalName %} · {{ art.originalName }}{% endif %}
+            </span>
+        </div>
+
+        <div class="d-flex gap-2 flex-wrap">
+            <button type="button" class="btn btn-outline-secondary btn-sm"
+                    data-controller="clipboard"
+                    data-clipboard-url-value="{{ path('app_art_file', {id: art.id}) }}"
+                    data-action="clipboard#copy">Copy image</button>
+
+            <a href="{{ path('app_art_file', {id: art.id}) }}" target="_blank" rel="noopener"
+               class="btn btn-outline-secondary btn-sm">Open full size</a>
+
+            <form method="post" action="{{ path('app_art_delete', {id: art.id}) }}"
+                  onsubmit="return confirm('Delete “{{ art.name|e('js') }}”?')">
+                <input type="hidden" name="_token" value="{{ csrf_token('delete-art-' ~ art.id) }}">
+                <button class="btn btn-outline-danger btn-sm">Delete</button>
+            </form>
+        </div>
+    </div>
+
+    <div class="card shadow-sm">
+        <div class="card-body text-center art-full">
+            <img src="{{ path('app_art_file', {id: art.id}) }}" alt="{{ art.name }}">
+        </div>
+    </div>
+{% endblock %}