DropdownMenu

用于显示下拉菜单的 Jetpack Compose DropdownMenu 组件。

Android

Included in Expo Go

Recommended version:

~57.0.3

Expo UI 下拉菜单与官方 Jetpack Compose Menu API 匹配，并在触发元素被按下时显示下拉菜单。

🌐 Expo UI DropdownMenu matches the official Jetpack Compose Menu API and displays a dropdown menu when a trigger element is pressed.

Three-dot more menu opened to show Edit, Share, and Delete options with leading icons

安装

🌐 Installation

Terminal

- npx expo install @expo/ui

If you are installing this in an existing React Native app, make sure to install expo in your project.

用法

🌐 Usage

基本下拉菜单

🌐 Basic dropdown menu

BasicDropdownMenuExample.tsx

import {
  Host,
  DropdownMenu,
  DropdownMenuItem,
  OutlinedButton,
  Text,
  Icon,
} from '@expo/ui/jetpack-compose';
import { useState } from 'react';

const homeIcon = require('./assets/home.xml');

export default function BasicDropdownMenuExample() {
  const [isExpanded, setIsExpanded] = useState(false);
  return (
    <Host matchContents>
      <DropdownMenu expanded={isExpanded} onDismissRequest={() => setIsExpanded(false)}>
        <DropdownMenu.Trigger>
          <OutlinedButton onClick={() => setIsExpanded(true)}>Show Menu</OutlinedButton>
        </DropdownMenu.Trigger>
        <DropdownMenu.Items>
          <DropdownMenuItem
            onClick={() => {
              setIsExpanded(false);
              console.log('Home pressed');
            }}>
            <DropdownMenuItem.Text>
              <Text>Home</Text>
            </DropdownMenuItem.Text>
            <DropdownMenuItem.LeadingIcon>
              <Icon source={homeIcon} size={24} />
            </DropdownMenuItem.LeadingIcon>
          </DropdownMenuItem>
        </DropdownMenu.Items>
      </DropdownMenu>
    </Host>
  );
}

React Native 组件作为触发器

🌐 React Native components as trigger

你可以通过将 React Native 视图（例如 Pressable）封装在 RNHostView 中，将其用作下拉菜单的触发器。

🌐 You can use a React Native view (such as Pressable) as the dropdown's trigger by wrapping it in RNHostView.

RNTriggerDropdownMenuExample.tsx

import {
  Host,
  DropdownMenu,
  DropdownMenuItem,
  Text as ComposeText,
  RNHostView,
} from '@expo/ui/jetpack-compose';
import { useState } from 'react';
import { Pressable, Text } from 'react-native';

export default function RNTriggerDropdownMenuExample() {
  const [isExpanded, setIsExpanded] = useState(false);
  return (
    <Host matchContents>
      <DropdownMenu expanded={isExpanded} onDismissRequest={() => setIsExpanded(false)}>
        <DropdownMenu.Trigger>
          <RNHostView matchContents>
            <Pressable
              onPress={() => setIsExpanded(true)}
              style={{
                alignSelf: 'flex-start',
                paddingHorizontal: 16,
                paddingVertical: 10,
                borderRadius: 8,
                backgroundColor: '#9B59B6',
              }}>
              <Text style={{ color: 'white', fontWeight: '600' }}>RN Pressable Trigger</Text>
            </Pressable>
          </RNHostView>
        </DropdownMenu.Trigger>
        <DropdownMenu.Items>
          <DropdownMenuItem onClick={() => setIsExpanded(false)}>
            <DropdownMenuItem.Text>
              <ComposeText>Item 1</ComposeText>
            </DropdownMenuItem.Text>
          </DropdownMenuItem>
          <DropdownMenuItem onClick={() => setIsExpanded(false)}>
            <DropdownMenuItem.Text>
              <ComposeText>Item 2</ComposeText>
            </DropdownMenuItem.Text>
          </DropdownMenuItem>
        </DropdownMenu.Items>
      </DropdownMenu>
    </Host>
  );
}

长按触发

🌐 Long-press trigger

Jetpack Compose 没有专门的长按菜单原语——你可以通过在触发视图上使用 combinedClickable 修饰符加上现有的受控 DropdownMenu 来组合一个。菜单会自动锚定到触发器。

🌐 Jetpack Compose has no dedicated long-press menu primitive — you compose one from a combinedClickable modifier on the trigger view plus the existing controlled DropdownMenu. The menu anchors to the trigger automatically.

LongPressDropdownMenuExample.tsx

import { Host, DropdownMenu, DropdownMenuItem, Text } from '@expo/ui/jetpack-compose';
import { background, combinedClickable } from '@expo/ui/jetpack-compose/modifiers';
import { useState } from 'react';

export default function LongPressDropdownMenuExample() {
  const [isExpanded, setIsExpanded] = useState(false);
  return (
    <Host matchContents>
      <DropdownMenu expanded={isExpanded} onDismissRequest={() => setIsExpanded(false)}>
        <DropdownMenu.Trigger>
          <Text
            modifiers={[
              background('#e0e0e0'),
              combinedClickable({
                onClick: () => console.log('Short tap'),
                onLongClick: () => setIsExpanded(true),
              }),
            ]}>
            Long-press me
          </Text>
        </DropdownMenu.Trigger>
        <DropdownMenu.Items>
          <DropdownMenuItem onClick={() => setIsExpanded(false)}>
            <DropdownMenuItem.Text>
              <Text>Copy</Text>
            </DropdownMenuItem.Text>
          </DropdownMenuItem>
          <DropdownMenuItem
            elementColors={{ textColor: '#B3261E' }}
            onClick={() => setIsExpanded(false)}>
            <DropdownMenuItem.Text>
              <Text>Delete</Text>
            </DropdownMenuItem.Text>
          </DropdownMenuItem>
        </DropdownMenu.Items>
      </DropdownMenu>
    </Host>
  );
}

应用接口

🌐 API

import { DropdownMenu } from '@expo/ui/jetpack-compose';

Components

`DropdownMenu`

Type: React.Element<DropdownMenuProps>

Props of the DropdownMenu component.

DropdownMenuProps

`children`

Type: ReactNode

The contents of the submenu are used as an anchor for the dropdown menu. The children will be wrapped in a pressable element, which triggers opening of the dropdown menu.

`color`

Optional • Type: ColorValue

The color of the container holding the dropdown menu items.

`expanded`

Optional • Type: boolean

Whether the dropdown menu is expanded (visible).

`modifiers`

Optional • Type: ModifierConfig[]

Modifiers for the component.

`onDismissRequest`

Optional • Type: () => void

Callback fired when the menu requests to be dismissed (e.g. tapping outside). Must be provided when expanded is true to allow the menu to close.

`style`

Optional • Type: StyleProp<ViewStyle>

Optional styles to apply to the DropdownMenu.

`DropdownMenuItem`

Only for:

Android

Type: React.Element<DropdownMenuItemProps>

A dropdown menu item component that wraps Compose's DropdownMenuItem. Should be used inside DropdownMenu.Items or ExposedDropdownMenu.

`Items`

Type: React.Element<{ children: ReactNode }>

Container for items displayed in the dropdown menu. Children should be DropdownMenuItem components or other native views.

`Preview`

Type: React.Element<{ children: ReactNode }>

Preview content shown during long press (iOS only).

`Trigger`

Type: React.Element<{ children: ReactNode }>

Container for the trigger element that opens the dropdown menu.