iter(g133): 新增树形选择 treeSelect

packages/skin/ui/src/index.ts

@@ -64,3 +64,4 @@ export { typography } from './typography.js';
 export { grid } from './grid.js';
 export { floatButton } from './floatButton.js';
 export { mentions } from './mentions.js';
+export { treeSelect } from './treeSelect.js';

packages/skin/ui/src/treeSelect.ts

@@ -0,0 +1,82 @@
+import { effect, h, signal } from '@ui-arch/frame';
+import { bindOutside, pushOverlay } from './overlay.js';
+import { tree } from './tree.js';
+import type { TreeNode, TreeSelectProps } from './types.js';
+
+/*** 按 key 深度优先找节点，用于把选中 key 还原成显示名 ***/
+function findNode(nodes: TreeNode[], key: string): TreeNode | null {
+  for (const node of nodes) {
+    if (node.key === key) return node; // 命中即返回
+    const hit = node.children ? findNode(node.children, key) : null;
+    if (hit) return hit;
+  }
+  return null;
+}
+
+/*** 树形选择：按钮触发弹层，内部复用 tree（搜索 / 多选 / 级联由 tree 提供）；单选选中即收起，多选保持展开 ***/
+export function treeSelect(props: TreeSelectProps): HTMLElement {
+  const open = signal(false); // 弹层开合
+  const value = props.value ?? signal(''); // 单选 key
+  const checked = props.checked ?? signal<string[]>([]); // 多选 key 集合
+  let release: (() => void) | null = null; // Esc 栈注销句柄
+  const labelEl = h('span', { class: 'ua-treeselect-label' });
+  const trigger = h('button', {
+    class: 'ua-treeselect-trigger',
+    type: 'button',
+    'aria-haspopup': 'tree',
+    'aria-expanded': 'false',
+  }, labelEl, h('span', { class: 'ua-treeselect-arrow', 'aria-hidden': 'true' }, '▾')) as HTMLButtonElement;
+  const pop = h('div', { class: 'ua-treeselect-pop' });
+  const inner = tree({
+    nodes: props.nodes,
+    searchable: props.searchable,
+    multi: props.multi,
+    selected: value,
+    checked,
+    onSelect: (node) => {
+      if (!props.multi) close(); // 单选选中即收起，少一次点击
+      props.onSelect?.(node);
+    },
+    onCheck: (keys) => {
+      props.onChange?.(keys);
+    },
+  });
+  pop.append(inner);
+  const wrap = h('div', { class: 'ua-treeselect' }, trigger, pop);
+
+  /*** 收起弹层并注销 Esc 栈 ***/
+  function close(): void {
+    open(false);
+    release?.();
+    release = null;
+  }
+
+  /*** 触发器文案：单选回显节点名，多选回显已选数量，都没选则显示占位 ***/
+  const paint = (): void => {
+    const keys = checked();
+    if (props.multi) {
+      labelEl.textContent = keys.length ? `已选 ${keys.length} 项` : (props.placeholder ?? '请选择');
+    } else {
+      const node = value() ? findNode(props.nodes, value()) : null;
+      labelEl.textContent = node ? node.label : (props.placeholder ?? '请选择');
+    }
+    wrap.classList.toggle('is-empty', props.multi ? !keys.length : !value());
+    trigger.disabled = Boolean(props.disabled);
+  };
+
+  trigger.addEventListener('click', () => {
+    if (props.disabled) return; // 卫语句：禁用不响应
+    if (open()) return close();
+    open(true);
+    release = pushOverlay(close); // 与其他弹层共享 Esc 栈，只关最上层
+  });
+  bindOutside(wrap, open, close);
+  effect(() => {
+    const on = open();
+    wrap.classList.toggle('is-open', on);
+    trigger.setAttribute('aria-expanded', String(on));
+    if (on) inner.querySelector('input')?.focus(); // 展开即聚焦搜索框，键盘可直接用
+  });
+  effect(paint);
+  return wrap;
+}

packages/skin/ui/src/types.ts

@@ -795,4 +795,17 @@ export interface MentionsProps {
   onInput?: (text: string) => void;       // 每次输入的回调，参数为当前全文
 }
 
+/*** 树形选择入参 ***/
+export interface TreeSelectProps {
+  nodes: TreeNode[];                 // 根节点列表（结构同 tree）
+  value?: Signal<string>;            // 单选选中 key；不传则内部维护
+  checked?: Signal<string[]>;        // 多选勾选 key 集合（multi 时生效）；不传则内部维护
+  multi?: boolean;                   // 多选模式：显示勾选框、父子级联、选中不收起；缺省 false
+  searchable?: boolean;              // 弹层内带搜索框；缺省 false
+  placeholder?: string;              // 未选中时触发器文案；缺省「请选择」
+  disabled?: boolean;                // 禁用整个触发器；缺省 false
+  onSelect?: (node: TreeNode) => void;   // 单选选中回调（弹层已收起）
+  onChange?: (keys: string[]) => void;   // 多选勾选变更回调（传副本，父子已级联）
+}
+
 export type { ColumnDef, RowKey }; // 再导出常用内核类型，方便调用方