feat(PickerGroup): the tab of PickerGroup supports controlled mode (#11771)

* feat(PickerGroup): add method to set the active of tab

* chore: update

* chore: format code

* chore: update

* chore: update

* docs: update docs

packages/vant/src/picker-group/PickerGroup.tsx

@@ -1,15 +1,17 @@
-import {
-  ref,
-  defineComponent,
-  type InjectionKey,
-  type ExtractPropTypes,
-} from 'vue';
+import { defineComponent, type InjectionKey, type ExtractPropTypes } from 'vue';
 
 // Utils
-import { extend, pick, makeArrayProp, createNamespace } from '../utils';
+import {
+  pick,
+  extend,
+  makeArrayProp,
+  makeNumericProp,
+  createNamespace,
+} from '../utils';
 
 // Composables
 import { useChildren } from '@vant/use';
+import { useSyncPropRef } from '../composables/use-sync-prop-ref';
 
 // Components
 import { Tab } from '../tab';
@@ -28,6 +30,7 @@ export const PICKER_GROUP_KEY: InjectionKey<PickerGroupProvide> = Symbol(name);
 export const pickerGroupProps = extend(
   {
     tabs: makeArrayProp<string>(),
+    activeTab: makeNumericProp(0),
     nextStepText: String,
   },
   pickerToolbarProps
@@ -40,20 +43,23 @@ export default defineComponent({
 
   props: pickerGroupProps,
 
-  emits: ['confirm', 'cancel'],
+  emits: ['confirm', 'cancel', 'update:activeTab'],
 
   setup(props, { emit, slots }) {
-    const activeTab = ref(0);
+    const activeTab = useSyncPropRef(
+      () => props.activeTab,
+      (value) => emit('update:activeTab', value)
+    );
     const { children, linkChildren } = useChildren(PICKER_GROUP_KEY);
 
     linkChildren();
 
     const showNextButton = () =>
-      activeTab.value < props.tabs.length - 1 && props.nextStepText;
+      +activeTab.value < props.tabs.length - 1 && props.nextStepText;
 
     const onConfirm = () => {
       if (showNextButton()) {
-        activeTab.value++;
+        activeTab.value = +activeTab.value + 1;
       } else {
         emit(
           'confirm',

packages/vant/src/picker-group/README.md

@@ -56,11 +56,13 @@ export default {
   setup() {
     const currentDate = ref(['2022', '06', '01']);
     const currentTime = ref(['12', '00']);
+
     const onConfirm = () => {
       showToast(
         `${currentDate.value.join('/')} ${currentTime.value.join(':')}`
       );
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -70,6 +72,8 @@ export default {
       maxDate: new Date(2025, 5, 1),
       currentDate,
       currentTime,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -104,11 +108,13 @@ export default {
   setup() {
     const currentDate = ref(['2022', '06', '01']);
     const currentTime = ref(['12', '00']);
+
     const onConfirm = () => {
       showToast(
         `${currentDate.value.join('/')} ${currentTime.value.join(':')}`
       );
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -118,6 +124,8 @@ export default {
       maxDate: new Date(2025, 5, 1),
       currentDate,
       currentTime,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -155,6 +163,7 @@ export default {
     const onConfirm = () => {
       showToast(`${startDate.value.join('/')} ${endDate.value.join('/')}`);
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -164,6 +173,8 @@ export default {
       maxDate: new Date(2025, 5, 1),
       endDate,
       startDate,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -197,6 +208,7 @@ export default {
     const onConfirm = () => {
       showToast(`${startTime.value.join(':')} ${endTime.value.join(':')}`);
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -204,6 +216,72 @@ export default {
     return {
       endTime,
       startTime,
+      onConfirm,
+      onCancel,
+    };
+  },
+};
+```
+
+### Controlled Mode
+
+Supports both uncontrolled and controlled modes:
+
+- When `v-model:active-tab` is not bound, the PickerGroup component completely controls the `tab` switching.
+- When `v-model:active-tab` is bound, PickerGroup supports controlled mode, and the `tab` switching is controlled by both the `v-model:active-tab` value and the component itself.
+
+```html
+<van-button type="primary" @click="setActiveTab">
+  toggle tab, current {{ activeTab }}
+</van-button>
+<van-picker-group
+  v-model:active-tab="activeTab"
+  title="Title"
+  :tabs="['Date', 'Time']"
+  @confirm="onConfirm"
+  @cancel="onCancel"
+>
+  <van-date-picker
+    v-model="currentDate"
+    :min-date="minDate"
+    :max-date="maxDate"
+  />
+  <van-time-picker v-model="currentTime" />
+</van-picker-group>
+```
+
+```js
+import { ref } from 'vue';
+import { showToast } from 'vant';
+
+export default {
+  setup() {
+    const activeTab = ref(0);
+    const currentDate = ref(['2022', '06', '01']);
+    const currentTime = ref(['12', '00']);
+
+    const setActiveTab = () => {
+      activeTab.value = activeTab.value ? 0 : 1;
+    };
+
+    const onConfirm = () => {
+      showToast(
+        `${currentDate.value.join('/')} ${currentTime.value.join(':')}`
+      );
+    };
+    const onCancel = () => {
+      showToast('cancel');
+    };
+
+    return {
+      minDate: new Date(2020, 0, 1),
+      maxDate: new Date(2025, 5, 1),
+      activeTab,
+      currentDate,
+      currentTime,
+      setActiveTab,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -213,13 +291,14 @@ export default {
 
 ### Props
 
-| Attribute               | Description              | Type       | Default   |
-| ----------------------- | ------------------------ | ---------- | --------- |
-| tabs                    | Titles of tabs           | _string[]_ | `[]`      |
-| title                   | Toolbar title            | _string_   | `''`      |
-| next-step-text `v4.0.8` | Text of next step button | _string_   | `''`      |
-| confirm-button-text     | Text of confirm button   | _string_   | `Confirm` |
-| cancel-button-text      | Text of cancel button    | _string_   | `Cancel`  |
+| Attribute | Description | Type | Default |
+| --- | --- | --- | --- |
+| v-model:active-tab | Set index of active tab | _number \| string_ | `0` |
+| tabs | Titles of tabs | _string[]_ | `[]` |
+| title | Toolbar title | _string_ | `''` |
+| next-step-text `v4.0.8` | Text of next step button | _string_ | `''` |
+| confirm-button-text | Text of confirm button | _string_ | `Confirm` |
+| cancel-button-text | Text of cancel button | _string_ | `Cancel` |
 
 ### Slots
 
@@ -235,5 +314,15 @@ export default {
 The component exports the following type definitions:
 
 ```ts
-import type { DatePickerProps, DatePickerColumnType } from 'vant';
+import type { PickerGroupProps, PickerGroupThemeVars } from 'vant';
 ```
+
+## Theming
+
+### CSS Variables
+
+The component provides the following CSS variables, which can be used to customize styles. Please refer to [ConfigProvider component](#/en-US/config-provider).
+
+| Name                          | Default Value        | Description |
+| ----------------------------- | -------------------- | ----------- |
+| --van-picker-group-background | _--van-background-2_ | -           |

packages/vant/src/picker-group/README.zh-CN.md

@@ -56,11 +56,13 @@ export default {
   setup() {
     const currentDate = ref(['2022', '06', '01']);
     const currentTime = ref(['12', '00']);
+
     const onConfirm = () => {
       showToast(
         `${currentDate.value.join('/')} ${currentTime.value.join(':')}`
       );
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -70,6 +72,8 @@ export default {
       maxDate: new Date(2025, 5, 1),
       currentDate,
       currentTime,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -104,11 +108,13 @@ export default {
   setup() {
     const currentDate = ref(['2022', '06', '01']);
     const currentTime = ref(['12', '00']);
+
     const onConfirm = () => {
       showToast(
         `${currentDate.value.join('/')} ${currentTime.value.join(':')}`
       );
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -118,6 +124,8 @@ export default {
       maxDate: new Date(2025, 5, 1),
       currentDate,
       currentTime,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -155,6 +163,7 @@ export default {
     const onConfirm = () => {
       showToast(`${startDate.value.join('/')} ${endDate.value.join('/')}`);
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -164,6 +173,8 @@ export default {
       maxDate: new Date(2025, 5, 1),
       endDate,
       startDate,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -197,6 +208,7 @@ export default {
     const onConfirm = () => {
       showToast(`${startTime.value.join(':')} ${endTime.value.join(':')}`);
     };
+
     const onCancel = () => {
       showToast('cancel');
     };
@@ -204,6 +216,73 @@ export default {
     return {
       endTime,
       startTime,
+      onConfirm,
+      onCancel,
+    };
+  },
+};
+```
+
+### 受控模式
+
+`PickerGroup` 中 `tab` 的切换支持非受控模式和受控模式：
+
+- 当未绑定 `v-model:active-tab` 时，PickerGroup 组件 `tab` 的切换完全由组件自身控制。
+- 当绑定 `v-model:active-tab` 时，PickerGroup 支持受控模式，此时组件 `tab` 的切换同时支持 `v-model:active-tab` 的值和组件本身控制。
+
+```html
+<van-button type="primary" @click="setActiveTab">
+  点击切换 tab，当前为 {{ activeTab }}
+</van-button>
+<van-picker-group
+  v-model:active-tab="activeTab"
+  title="预约日期"
+  :tabs="['选择日期', '选择时间']"
+  @confirm="onConfirm"
+  @cancel="onCancel"
+>
+  <van-date-picker
+    v-model="currentDate"
+    :min-date="minDate"
+    :max-date="maxDate"
+  />
+  <van-time-picker v-model="currentTime" />
+</van-picker-group>
+```
+
+```js
+import { ref } from 'vue';
+import { showToast } from 'vant';
+
+export default {
+  setup() {
+    const activeTab = ref(0);
+    const currentDate = ref(['2022', '06', '01']);
+    const currentTime = ref(['12', '00']);
+
+    const setActiveTab = () => {
+      activeTab.value = activeTab.value ? 0 : 1;
+    };
+
+    const onConfirm = () => {
+      showToast(
+        `${currentDate.value.join('/')} ${currentTime.value.join(':')}`
+      );
+    };
+
+    const onCancel = () => {
+      showToast('cancel');
+    };
+
+    return {
+      minDate: new Date(2020, 0, 1),
+      maxDate: new Date(2025, 5, 1),
+      activeTab,
+      currentDate,
+      currentTime,
+      setActiveTab,
+      onConfirm,
+      onCancel,
     };
   },
 };
@@ -213,13 +292,14 @@ export default {
 
 ### Props
 
-| 参数                    | 说明             | 类型       | 默认值 |
-| ----------------------- | ---------------- | ---------- | ------ |
-| tabs                    | 设置标签页的标题 | _string[]_ | `[]`   |
-| title                   | 顶部栏标题       | _string_   | `''`   |
-| next-step-text `v4.0.8` | 下一步按钮的文字 | _string_   | `''`   |
-| confirm-button-text     | 确认按钮的文字   | _string_   | `确认` |
-| cancel-button-text      | 取消按钮的文字   | _string_   | `取消` |
+| 参数                    | 说明               | 类型               | 默认值 |
+| ----------------------- | ------------------ | ------------------ | ------ |
+| v-model:active-tab      | 设置当前选中的标签 | _number \| string_ | `0`    |
+| tabs                    | 设置标签页的标题   | _string[]_         | `[]`   |
+| title                   | 顶部栏标题         | _string_           | `''`   |
+| next-step-text `v4.0.8` | 下一步按钮的文字   | _string_           | `''`   |
+| confirm-button-text     | 确认按钮的文字     | _string_           | `确认` |
+| cancel-button-text      | 取消按钮的文字     | _string_           | `取消` |
 
 ### Slots
 
@@ -235,5 +315,15 @@ export default {
 组件导出以下类型定义：
 
 ```ts
-import type { PickerGroupProps } from 'vant';
+import type { PickerGroupProps, PickerGroupThemeVars } from 'vant';
 ```
+
+## 主题定制
+
+### 样式变量
+
+组件提供了下列 CSS 变量，可用于自定义样式，使用方法请参考 [ConfigProvider 组件](#/zh-CN/config-provider)。
+
+| 名称                          | 默认值               | 描述 |
+| ----------------------------- | -------------------- | ---- |
+| --van-picker-group-background | _--van-background-2_ | -    |

packages/vant/src/picker-group/demo/ControlTab.vue

@@ -0,0 +1,60 @@
+<script setup lang="ts">
+import { ref } from 'vue';
+import { useTranslate } from '../../../docs/site';
+import VanPickerGroup from '..';
+import VanButton from '../../button';
+import VanTimePicker from '../../time-picker';
+import VanDatePicker from '../../date-picker';
+import { showToast } from '../../toast';
+
+const t = useTranslate({
+  'zh-CN': {
+    date: '选择日期',
+    time: '选择时间',
+    title: '预约日期',
+    btnText: '点击切换 tab，当前为 ',
+  },
+  'en-US': {
+    date: 'Date',
+    time: 'Time',
+    title: 'Title',
+    btnText: 'toggle tab, current ',
+  },
+});
+const activeTab = ref(0);
+const currentTime = ref(['12', '00']);
+const currentDate = ref(['2022', '06', '01']);
+const minDate = new Date(2020, 0, 1);
+const maxDate = new Date(2025, 5, 1);
+
+const onConfirm = () => {
+  showToast(`${currentDate.value.join('/')} ${currentTime.value.join(':')}`);
+};
+const onCancel = () => {
+  showToast('cancel');
+};
+
+const setActiveTab = () => {
+  activeTab.value = activeTab.value ? 0 : 1;
+};
+</script>
+
+<template>
+  <van-button style="margin: 10px 0" type="primary" @click="setActiveTab">
+    {{ t('btnText') + activeTab }}
+  </van-button>
+  <van-picker-group
+    v-model:active-tab="activeTab"
+    :title="t('title')"
+    :tabs="[t('date'), t('time')]"
+    @confirm="onConfirm"
+    @cancel="onCancel"
+  >
+    <van-date-picker
+      v-model="currentDate"
+      :min-date="minDate"
+      :max-date="maxDate"
+    />
+    <van-time-picker v-model="currentTime" />
+  </van-picker-group>
+</template>

packages/vant/src/picker-group/demo/index.vue

@@ -3,6 +3,7 @@ import SelectDateTime from './SelectDateTime.vue';
 import SelectTimeRange from './SelectTimeRange.vue';
 import SelectDateRange from './SelectDateRange.vue';
 import NextStepButton from './NextStepButton.vue';
+import ControlTab from './ControlTab.vue';
 import { useTranslate } from '../../../docs/site';
 
 const t = useTranslate({
@@ -11,12 +12,14 @@ const t = useTranslate({
     selectDateRange: '选择日期范围',
     selectTimeRange: '选择时间范围',
     nextStepButton: '下一步按钮',
+    controlled: '受控模式',
   },
   'en-US': {
     selectDateTime: 'Select Date Time',
     selectDateRange: 'Select Date Range',
     selectTimeRange: 'Select Time Range',
     nextStepButton: 'Next Step Button',
+    controlled: 'Controlled Mode',
   },
 });
 </script>
@@ -37,4 +40,8 @@ const t = useTranslate({
   <demo-block card :title="t('selectTimeRange')">
     <select-time-range />
   </demo-block>
+
+  <demo-block card :title="t('controlled')">
+    <control-tab />
+  </demo-block>
 </template>

packages/vant/src/picker-group/test/index.spec.tsx

@@ -1,5 +1,5 @@
 import { ref } from 'vue';
-import { mount } from '../../../test';
+import { later, mount } from '../../../test';
 import { Picker, PickerConfirmEventParams } from '../../picker';
 import { PickerGroup } from '..';
 
@@ -108,3 +108,38 @@ test('should switch to next step when click confirm button', async () => {
     ],
   ]);
 });
+
+test('support controlled mode to set active-tab', async () => {
+  const value1 = ref(['1']);
+  const value2 = ref(['2']);
+  const activeTab = ref(0);
+
+  const wrapper = mount({
+    render() {
+      return (
+        <PickerGroup
+          activeTab={activeTab.value}
+          title="Title"
+          tabs={['Tab1', 'Tab2']}
+        >
+          <Picker
+            v-model={value1.value}
+            columns={[{ text: '1', value: '1' }]}
+          />
+          <Picker
+            v-model={value2.value}
+            columns={[{ text: '2', value: '2' }]}
+          />
+        </PickerGroup>
+      );
+    },
+  });
+
+  await later();
+  const tabs = wrapper.findAll('.van-tab');
+  expect(tabs[0]?.classes()).toContain('van-tab--active');
+
+  activeTab.value = 1;
+  await later();
+  expect(tabs[1]?.classes()).toContain('van-tab--active');
+});