feat: thumbnail picker custom per selezione modello/scena

- GET /folder_image/{filename}?w=N: PNG ridotto cache 1h
- Frontend: 2 thumb-picker al posto dei select (thumb + nome + caret)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pm2d/web/server.py

@@ -292,6 +292,25 @@ def index():
     return HTMLResponse(html_path.read_text(encoding="utf-8"))
 
 
+@app.get("/folder_image/{filename}")
+def folder_image(filename: str, w: int = 120):
+    """Serve thumbnail PNG dell'immagine IMAGES_DIR (scalata a width w)."""
+    if "/" in filename or ".." in filename:
+        raise HTTPException(400, "nome non valido")
+    path = IMAGES_DIR / filename
+    if not path.is_file():
+        raise HTTPException(404, "non trovato")
+    img = cv2.imread(str(path), cv2.IMREAD_COLOR)
+    if img is None:
+        raise HTTPException(400, "non leggibile")
+    h0, w0 = img.shape[:2]
+    if w0 > w:
+        sc = w / w0
+        img = cv2.resize(img, (w, int(h0 * sc)), interpolation=cv2.INTER_AREA)
+    return Response(_encode_png(img), media_type="image/png",
+                    headers={"Cache-Control": "public, max-age=3600"})
+
+
 @app.get("/images")
 def list_images():
     """Lista file immagine nella cartella configurata in IMAGES_DIR."""

pm2d/web/static/app.js

@@ -80,18 +80,56 @@ async function fetchImagesList() {
   return await r.json();
 }
 
-function populateSelect(selectEl, files) {
-  selectEl.innerHTML = "";
-  const opt0 = document.createElement("option");
-  opt0.value = ""; opt0.textContent = "-- seleziona --";
-  selectEl.appendChild(opt0);
-  for (const f of files) {
-    const o = document.createElement("option");
-    o.value = f; o.textContent = f;
-    selectEl.appendChild(o);
-  }
+function buildThumbPicker(pickerId, files, onSelect) {
+  const picker = document.getElementById(pickerId);
+  const current = picker.querySelector(".picker-current");
+  const list = picker.querySelector(".picker-list");
+  const text = current.querySelector(".picker-text");
+  // Rimuovi eventuale vecchia thumbnail
+  const oldImg = current.querySelector("img");
+  if (oldImg) oldImg.remove();
+  list.innerHTML = "";
+
+  files.forEach((f) => {
+    const item = document.createElement("div");
+    item.className = "picker-item";
+    const img = document.createElement("img");
+    img.src = `/folder_image/${encodeURIComponent(f)}?w=120`;
+    img.loading = "lazy";
+    const name = document.createElement("span");
+    name.className = "name"; name.textContent = f;
+    item.appendChild(img); item.appendChild(name);
+    item.addEventListener("click", () => {
+      // Aggiorna la visual del "current"
+      let thumb = current.querySelector("img");
+      if (!thumb) {
+        thumb = document.createElement("img");
+        current.insertBefore(thumb, text);
+      }
+      thumb.src = `/folder_image/${encodeURIComponent(f)}?w=80`;
+      text.textContent = f;
+      picker.classList.remove("open");
+      onSelect(f);
+    });
+    list.appendChild(item);
+  });
+
+  current.onclick = () => {
+    // Chiudi altri picker aperti
+    document.querySelectorAll(".thumb-picker.open")
+      .forEach((p) => { if (p !== picker) p.classList.remove("open"); });
+    picker.classList.toggle("open");
+  };
 }
 
+// Close picker on outside click
+document.addEventListener("click", (e) => {
+  if (!e.target.closest(".thumb-picker")) {
+    document.querySelectorAll(".thumb-picker.open")
+      .forEach((p) => p.classList.remove("open"));
+  }
+});
+
 function loadImage(src) {
   return new Promise((res, rej) => {
     const img = new Image();
@@ -310,19 +348,15 @@ function setStatus(s) {
 window.addEventListener("DOMContentLoaded", async () => {
   buildAdvancedForm();
   setupROI();
-  // Popola dropdown immagini da IMAGES_DIR
+  // Popola picker immagini da IMAGES_DIR (con thumbnail)
   const {files, dir} = await fetchImagesList();
-  const selM = document.getElementById("sel-model");
-  const selS = document.getElementById("sel-scene");
-  populateSelect(selM, files);
-  populateSelect(selS, files);
+  buildThumbPicker("picker-model", files, onSelectModel);
+  buildThumbPicker("picker-scene", files, onSelectScene);
   if (files.length === 0) {
     setStatus(`Nessuna immagine in ${dir} (configura IMAGES_DIR in .env)`);
   } else {
     setStatus(`${files.length} immagini disponibili in ${dir}`);
   }
-  selM.addEventListener("change", (e) => onSelectModel(e.target.value));
-  selS.addEventListener("change", (e) => onSelectScene(e.target.value));
   document.getElementById("btn-match").addEventListener("click", doMatch);
   const slider = document.getElementById("p-min-score");
   slider.addEventListener("input", (e) => {

pm2d/web/static/index.html

@@ -10,13 +10,21 @@
   <h1>Pattern Matching 2D</h1>
   <div class="toolbar">
     <label class="tb-label">Modello:</label>
-    <select id="sel-model" class="tb-select">
-      <option value="">-- seleziona --</option>
-    </select>
+    <div class="thumb-picker" id="picker-model">
+      <div class="picker-current" tabindex="0">
+        <span class="picker-text">-- seleziona --</span>
+        <span class="caret">▾</span>
+      </div>
+      <div class="picker-list"></div>
+    </div>
     <label class="tb-label">Scena:</label>
-    <select id="sel-scene" class="tb-select">
-      <option value="">-- seleziona --</option>
-    </select>
+    <div class="thumb-picker" id="picker-scene">
+      <div class="picker-current" tabindex="0">
+        <span class="picker-text">-- seleziona --</span>
+        <span class="caret">▾</span>
+      </div>
+      <div class="picker-list"></div>
+    </div>
     <button class="btn btn-go" id="btn-match">▶ MATCH</button>
     <span id="status">Seleziona modello, disegna ROI, seleziona scena</span>
   </div>

pm2d/web/static/style.css

@@ -27,12 +27,39 @@ header h1 {
 }
 .btn-go:hover { background: #0d9c48; }
 .tb-label { color: #b0b0b0; font-size: 12px; margin-left: 8px; }
-.tb-select {
+
+.thumb-picker { position: relative; display: inline-block; }
+.picker-current {
+  display: flex; align-items: center; gap: 8px;
   background: #2a2a2a; color: #dcdcdc; border: 1px solid #444;
-  padding: 5px 8px; border-radius: 3px; font-size: 13px;
-  min-width: 160px;
+  padding: 4px 8px; border-radius: 3px; font-size: 13px;
+  cursor: pointer; min-width: 200px; min-height: 32px;
 }
-.tb-select:focus { outline: 1px solid #00c8ff; }
+.picker-current:hover { background: #353535; }
+.picker-current img {
+  width: 36px; height: 36px; object-fit: contain;
+  background: #141414; border-radius: 2px;
+}
+.picker-text { flex: 1; white-space: nowrap; overflow: hidden;
+  text-overflow: ellipsis; }
+.caret { color: #888; font-size: 10px; }
+.picker-list {
+  display: none; position: absolute; top: 100%; left: 0;
+  background: #232323; border: 1px solid #444; border-radius: 3px;
+  margin-top: 2px; z-index: 100; max-height: 360px; overflow-y: auto;
+  box-shadow: 0 4px 12px rgba(0,0,0,0.6); min-width: 280px;
+}
+.thumb-picker.open .picker-list { display: block; }
+.picker-item {
+  display: flex; align-items: center; gap: 10px;
+  padding: 6px 10px; cursor: pointer; border-bottom: 1px solid #2a2a2a;
+}
+.picker-item:hover { background: #2e2e2e; }
+.picker-item img {
+  width: 60px; height: 60px; object-fit: contain;
+  background: #141414; border-radius: 2px;
+}
+.picker-item .name { color: #dcdcdc; font-size: 13px; }
 #status {
   color: #00c8ff; margin-left: 12px; font-weight: 500;
 }