Screen orientation

@symbiote-native/screen-orientation wraps expo-screen-orientation — orientation locking, reading the current orientation and lock, and an auto-updating orientation-change subscription — so every SymbioteNative adapter can reach it, not just React. Like network, it mixes stateless one-shot functions (lockAsync/unlockAsync/getOrientationAsync/…) with exactly one live subscription: useScreenOrientation seeds from one-shot getOrientationAsync()/getOrientationLockAsync() calls and then subscribes to addOrientationChangeListener for live updates, the same seed-then-subscribe shape as network’s own useNetworkState.

OS platform	Support
iOS	✅ live
Android	✅ live

Framework adapter	Support
React	✅ live
Vue	✅ live
Angular	✅ live
Svelte	✅ live

Android has no native expoDidUpdateDimensions event

expo-screen-orientation doesn’t emit its own expoDidUpdateDimensions event on Android — the module piggybacks on RN’s own Dimensions.addEventListener('change', ...) there instead, re-fetching the lock and orientation on every dimensions change. iOS and web both subscribe to the native expoDidUpdateDimensions event directly.

Installation

npm install @symbiote-native/screen-orientation

expo-screen-orientation and expo-modules-core come along as regular dependencies, pinned to exact versions — never install either yourself, and never add the expo meta-package to your project (it bundles its own Metro/Babel pipeline, which conflicts with this project’s own).

Native setup is required before first use

expo-screen-orientation’s native code is discovered by expo-modules-autolinking, a different mechanism from the react-native.config.cjs/podspec autolinking every other SymbioteNative wrapper uses — and it isn’t the standard Expo setup flow either, since this project never installs the expo meta-package. Follow How to: wire up an Expo native module once per app first; it covers this package and every other expo-modules-core package with zero further native changes.

No platform permission string is needed — locking and reading the current orientation read/write system state with no runtime permission prompt on either platform.

Usage

Reactive orientation state

React

import { Button, Text } from '@symbiote-native/react';
import { lockAsync, OrientationLock } from '@symbiote-native/screen-orientation';
import { useScreenOrientation } from '@symbiote-native/screen-orientation/react';

export default function ScreenOrientationScreen() {
  const { orientation, orientationLock } = useScreenOrientation();

  return (
    <>
      <Text>Orientation: {orientation}</Text>
      <Text>Lock: {orientationLock}</Text>
      <Button title="Lock landscape" onPress={() => lockAsync(OrientationLock.LANDSCAPE)} />
    </>
  );
}

Vue

<script setup lang="ts">
import { Text } from '@symbiote-native/vue';
import { lockAsync, OrientationLock } from '@symbiote-native/screen-orientation';
import { useScreenOrientation } from '@symbiote-native/screen-orientation/vue';

const screenOrientation = useScreenOrientation(); // Ref<ScreenOrientationState>

function onLockLandscape() {
  void lockAsync(OrientationLock.LANDSCAPE);
}
</script>

<template>
  <Text>Orientation: {{ screenOrientation.orientation }}</Text>
  <Text>Lock: {{ screenOrientation.orientationLock }}</Text>
  <Button title="Lock landscape" @press="onLockLandscape" />
</template>

Angular

import { Component, inject } from '@angular/core';
import { Button, Text } from '@symbiote-native/angular';
import { lockAsync, OrientationLock } from '@symbiote-native/screen-orientation';
import { ScreenOrientationService } from '@symbiote-native/screen-orientation/angular';

@Component({
  standalone: true,
  imports: [Button, Text],
  template: `
    <Text>Orientation: {{ screenOrientation().orientation }}</Text>
    <Text>Lock: {{ screenOrientation().orientationLock }}</Text>
    <Button title="Lock landscape" (press)="onLockLandscape()" />
  `,
})
export class ScreenOrientationScreen {
  readonly screenOrientation = inject(ScreenOrientationService).connect(); // Signal<ScreenOrientationState>

  onLockLandscape(): void {
    void lockAsync(OrientationLock.LANDSCAPE);
  }
}

Svelte

<script lang="ts">
  import { Button, Text } from '@symbiote-native/svelte';
  import { lockAsync, OrientationLock } from '@symbiote-native/screen-orientation';
  import { useScreenOrientation } from '@symbiote-native/screen-orientation/svelte';

  const screenOrientation = useScreenOrientation(); // { readonly current: ScreenOrientationState }

  function onLockLandscape(): void {
    void lockAsync(OrientationLock.LANDSCAPE);
  }
</script>

<Text>Orientation: {screenOrientation.current.orientation}</Text>
<Text>Lock: {screenOrientation.current.orientationLock}</Text>
<Button title="Lock landscape" onPress={onLockLandscape} />

API

Functions

Signature	Description
lockAsync(orientationLock: OrientationLock): Promise<void>	Locks the screen to the given OrientationLock. Throws a TypeError for an invalid value; a no-op for OrientationLock.OTHER
lockPlatformAsync(options: PlatformOrientationInfo): Promise<void>	Locks via a platform-specific param — an Android numeric constant, an iOS Orientation[], or a web WebOrientationLock string
unlockAsync(): Promise<void>	Unlocks the screen orientation back to OrientationLock.DEFAULT
getOrientationAsync(): Promise<Orientation>	Gets the device’s current screen orientation
getOrientationLockAsync(): Promise<OrientationLock>	Gets the current orientation lock, falling back to the last value set via lockAsync()/lockPlatformAsync() when the native method itself isn’t available
getPlatformOrientationLockAsync(): Promise<PlatformOrientationInfo>	Gets the current orientation lock as a platform-specific value
supportsOrientationLockAsync(orientationLock: OrientationLock): Promise<boolean>	Whether the given orientation lock is supported on this device
addOrientationChangeListener(listener: OrientationChangeListener): EventSubscription	Subscribes to orientation-change events — fires whenever orientation or lock changes. The primitive useScreenOrientation wraps
removeOrientationChangeListener(subscription: EventSubscription): void	Removes a single orientation-change listener’s subscription
removeOrientationChangeListeners(): void	Removes every orientation-change listener registered via addOrientationChangeListener()

useScreenOrientation() config

Takes no arguments — the hook/composable/service seeds and subscribes automatically.

useScreenOrientation() return value

Field	Type	Description
orientation	Orientation	The device’s current screen orientation, seeded Orientation.UNKNOWN until the first reading arrives
orientationLock	OrientationLock	The current orientation lock, seeded OrientationLock.UNKNOWN until the first reading arrives

React returns this shape as a plain value; Vue returns Ref<ScreenOrientationState>; Angular’s ScreenOrientationService.connect() returns Signal<ScreenOrientationState>; Svelte returns { readonly current: ScreenOrientationState }, a boxed getter read as .current.

Orientation

Member	Value	Description
UNKNOWN	0	The orientation could not be determined
PORTRAIT_UP	1	Right-side-up portrait
PORTRAIT_DOWN	2	Upside-down portrait
LANDSCAPE_LEFT	3	Landscape, rotated left
LANDSCAPE_RIGHT	4	Landscape, rotated right

OrientationLock

Member	Value	Description
DEFAULT	0	iOS: all orientations except PORTRAIT_DOWN. Android: system decides
ALL	1	All four possible orientations
PORTRAIT	2	Any portrait orientation
PORTRAIT_UP	3	Right-side-up portrait only
PORTRAIT_DOWN	4	Upside-down portrait only
LANDSCAPE	5	Any landscape orientation
LANDSCAPE_LEFT	6	Left landscape only
LANDSCAPE_RIGHT	7	Right landscape only
OTHER	8	A platform-specific orientation — not a valid lockAsync() policy
UNKNOWN	9	Unknown lock — not a valid lockAsync() policy

ALL/PORTRAIT are invalid on devices that don’t support PORTRAIT_DOWN.

SizeClassIOS

Member	Value	Description
UNKNOWN	0	The size class could not be determined
COMPACT	1	iOS compact UIKit size class
REGULAR	2	iOS regular UIKit size class

WebOrientationLock / WebOrientation

Member	Value	Description
PORTRAIT_PRIMARY	'portrait-primary'	The primary portrait orientation
PORTRAIT_SECONDARY	'portrait-secondary'	The secondary (upside-down) portrait orientation
PORTRAIT	'portrait'	Any portrait orientation. WebOrientationLock only
LANDSCAPE_PRIMARY	'landscape-primary'	The primary landscape orientation
LANDSCAPE_SECONDARY	'landscape-secondary'	The secondary (rotated) landscape orientation
LANDSCAPE	'landscape'	Any landscape orientation. WebOrientationLock only
ANY	'any'	Any orientation. WebOrientationLock only
NATURAL	'natural'	The device’s natural orientation. WebOrientationLock only
UNKNOWN	'unknown'	The orientation/lock could not be determined

WebOrientation only defines the four primary/secondary members (no PORTRAIT/LANDSCAPE/ ANY/NATURAL) — it describes a resolved orientation, not a lock policy.

PlatformOrientationInfo

Field	Type	Description
screenOrientationConstantAndroid	number | undefined	An Android ActivityInfo screen-orientation constant. @platform android
screenOrientationArrayIOS	Orientation[] | undefined	The set of allowed Orientation values on iOS. @platform ios
screenOrientationLockWeb	WebOrientationLock | undefined	The lock value to pass to the Screen Orientation Web API. @platform web

ScreenOrientationInfo

Field	Type	Description
orientation	Orientation	The resolved orientation
verticalSizeClass	SizeClassIOS | undefined	The current vertical UIKit size class. @platform ios
horizontalSizeClass	SizeClassIOS | undefined	The current horizontal UIKit size class. @platform ios

OrientationChangeEvent

Field	Type	Description
orientationLock	OrientationLock	The orientation lock in effect when the change fired
orientationInfo	ScreenOrientationInfo	The resolved orientation info at the time of the change

Notes

• iOS rejects a lock the device cannot satisfy; Android accepts it. lockAsync and lockPlatformAsync check the requested mask against isSupportedByDevice() and throw UnsupportedOrientationLockException otherwise — that is how PORTRAIT_DOWN (and ALL, which contains it) fails on an iPhone. Android writes the value straight to activity.requestedOrientation, and only a lock it cannot map raises at all. Probe with supportsOrientationLockAsync before locking if you care about the difference.
• On Android the lock belongs to the current activity. Every native function resolves appContext.currentActivity and throws MissingActivity when there is none, and the module writes the activity’s initial requestedOrientation back when it is destroyed — a lock does not outlive the activity that set it.
• iOS re-applies the last lock when the app returns to the foreground. The module unregisters itself while backgrounded and re-asserts the last mask it set on resume; the Android path has no equivalent step.
• getOrientationAsync on Android is best effort. It derives the orientation from the display rotation plus window metrics rather than from a dedicated system API — upstream’s own comment says surface rotation is not standardized across devices. Devices whose natural orientation is landscape take a different rotation-to-orientation branch, so a tablet and a phone held at the same physical angle can report different values.

How the wrapper works

@symbiote-native/screen-orientation ships zero React/Vue/Angular logic in expo-screen-orientation itself — its functions and types are hand-ported, verbatim, into this package’s own core/, resolving the native module through expo-modules-core’s requireNativeModule rather than the expo meta-package this project never installs:

packages/screen-orientation/src/
├── core/                 lock*/unlock/get* functions + addOrientationChangeListener
│                         subscription. native-module.ts resolves the native module through
│                         expo-modules-core's requireNativeModule. types.ts —
│                         Orientation/OrientationLock/SizeClassIOS/WebOrientationLock/
│                         WebOrientation enums, PlatformOrientationInfo, ScreenOrientationInfo,
│                         OrientationChangeEvent, hand-ported from ScreenOrientation.types.ts,
│                         plus ScreenOrientationState (this package's own hook/composable/
│                         service return shape).
├── react/hooks/          @symbiote-native/screen-orientation/react   — useScreenOrientation
├── vue/composables/      @symbiote-native/screen-orientation/vue     — useScreenOrientation (same name)
├── svelte/runes/         @symbiote-native/screen-orientation/svelte  — useScreenOrientation (same name)
└── angular/services/     @symbiote-native/screen-orientation/angular — ScreenOrientationService
                          (`.connect()` returns a Signal)

Each adapter’s hook/composable/rune/service is a thin lifecycle wrapper — seed from one-shot getOrientationAsync()/getOrientationLockAsync() calls, subscribe to addOrientationChangeListener, unsubscribe on unmount — over the same core functions, the same one-listener seed-then-subscribe shape as network’s useNetworkState/NetworkStateService. The native code itself is never vendored or copied — expo-modules-autolinking resolves it straight out of node_modules (see the native setup guide).