编辑器体验改进

- 导入文件后直接关闭弹窗 + toast 提示导入数量
- 自动布局改为按出口顺序的子树居中：选项1/2/3 分支顺序正确且对齐

web/static/app.js

@@ -210,14 +210,16 @@
   }
 
   $("import-do").onclick = async () => {
-    $("import-result").classList.add("err"); $("import-result").style.color = "";
+    $("import-result").textContent = "";
     let events;
     try { events = await collectImportEvents(); } catch (e) { $("import-result").textContent = e.message; return; }
     if (!events.length) { $("import-result").textContent = "请先选择文件或粘贴 JSON"; return; }
     const r = await api("/api/import", { method: "POST", body: JSON.stringify({ events, by: App.by }) });
     const d = await r.json();
-    $("import-result").textContent = "已导入 " + (d.saved || []).length + " 个" + ((d.errors || []).length ? "，" + d.errors.join("；") : "");
     importFiles = []; renderImportFiles(); $("import-text").value = "";
+    $("import-modal").classList.add("hidden");              // 导入完直接关闭
+    const ne = (d.errors || []).length;
+    toast("已导入 " + (d.saved || []).length + " 个事件" + (ne ? "，" + ne + " 个跳过/出错" : ""));
     await loadList();
   };
 
@@ -241,6 +243,14 @@
 
   // ---------- 工具 ----------
   function esc(s) { return String(s == null ? "" : s).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;"); }
+  let toastTimer = null;
+  function toast(msg) {
+    let el = $("toast");
+    if (!el) { el = document.createElement("div"); el.id = "toast"; document.body.appendChild(el); }
+    el.textContent = msg; el.classList.add("show");
+    clearTimeout(toastTimer);
+    toastTimer = setTimeout(() => el.classList.remove("show"), 2600);
+  }
 
   // ---------- 画布工具栏 ----------
   $("btn-autolayout").onclick = () => {

web/static/graph.js

@@ -91,21 +91,36 @@
     (ir.nodes || []).forEach(n => nodes[n.id] = n);
     (ir.endings || []).forEach(e => nodes[e.id] = e);
     const ids = Object.keys(nodes);
+    // 层级：最长路径（决定横向 x，左→右）
     const edges = [];
-    (ir.nodes || []).forEach(n => rawTargets(n).forEach(t => { if (t && nodes[t]) edges.push([n.id, t]); }));
+    ids.forEach(id => rawTargets(nodes[id]).forEach(t => { if (t && nodes[t]) edges.push([id, t]); }));
     const layer = {}; ids.forEach(id => layer[id] = 0);
     let changed = true, guard = 0;
     while (changed && guard++ < 9999) {
       changed = false;
       edges.forEach(([u, v]) => { if (layer[v] < layer[u] + 1) { layer[v] = layer[u] + 1; changed = true; } });
     }
-    const perLayer = {}, pos = {};
-    ids.forEach(id => {
-      const l = layer[id]; perLayer[l] = perLayer[l] || 0;
-      // 横向分层（左→右），契合 Drawflow 端口左右朝向
-      pos[id] = { x: 40 + l * COL, y: 30 + perLayer[l] * ROW };
-      perLayer[l]++;
-    });
+    // 有序子表（按出口顺序，去重）+ 入度求根
+    const childMap = {}, indeg = {}; ids.forEach(id => { childMap[id] = []; indeg[id] = 0; });
+    const seen = new Set();
+    ids.forEach(id => rawTargets(nodes[id]).forEach(t => {
+      if (t && nodes[t]) { const k = id + ">" + t; if (!seen.has(k)) { seen.add(k); childMap[id].push(t); indeg[t]++; } }
+    }));
+    let roots = ids.filter(id => indeg[id] === 0);
+    if (!roots.length && ids.length) roots = [ids[0]];
+    // 子树居中：按出口顺序递归分配纵向 y，父节点居子范围中点 → 选项1上/2中/3下且对齐
+    const ypos = {}; let nextY = 0; const vis = new Set();
+    function assignY(id) {
+      if (!id || vis.has(id)) return; vis.add(id);
+      if (!childMap[id].length) { ypos[id] = nextY; nextY += ROW; return; }
+      childMap[id].forEach(assignY);
+      const placed = childMap[id].map(c => ypos[c]).filter(v => v !== undefined);
+      ypos[id] = placed.length ? (Math.min(...placed) + Math.max(...placed)) / 2 : (nextY += ROW, nextY - ROW);
+    }
+    roots.forEach(assignY);
+    ids.forEach(id => { if (ypos[id] === undefined) { ypos[id] = nextY; nextY += ROW; } });
+    const pos = {};
+    ids.forEach(id => { pos[id] = { x: 40 + layer[id] * COL, y: 30 + ypos[id] }; });
     return pos;
   }
   function ensureLayout(ir) {

web/static/style.css

@@ -114,6 +114,13 @@ button.mini { padding:2px 8px; font-size:12px; }
 #drawflow .connection .main-path { stroke:#7a96c8; stroke-width:2.4px; }
 #drawflow .connection .main-path:hover { stroke:#e6c878; }
 
+/* ---- toast ---- */
+#toast { position:fixed; left:50%; bottom:38px; transform:translateX(-50%) translateY(10px);
+         background:#2a2316; color:#f3dca0; border:1px solid #6a5630; border-radius:7px;
+         padding:10px 18px; font-size:13.5px; box-shadow:0 4px 16px rgba(0,0,0,.5);
+         opacity:0; pointer-events:none; transition:.25s; z-index:9999; }
+#toast.show { opacity:1; transform:translateX(-50%) translateY(0); }
+
 /* ---- form ---- */
 .fld { margin:9px 0; }
 .fld > label { display:block; font-size:12px; color:#9a8f7e; margin-bottom:3px; }