react-motion-lightbox

A lightbox for React Native. It opens out of the picture you tapped and closes back into it. iOS and Android, with or without Expo.

It's the phone version of react-motion-lightbox, which I built for my own site and for Gryt. Gryt's phone app is the first one to use this. The props have the same names wherever that made sense, so if you know one you know the other.

What it does

• Opens out of the picture you tapped, measured on screen. Without one, it fades in.
• Swipe between pictures. You can flick them, and grab one while it's still moving. After the last picture comes the first again.
• The motion matches the web version: the same glide and the same spring.
• Pinch to zoom, up to 8x, and pan around while zoomed in. Double-tap zooms in on that spot, or back out.
• Swipe down to close. The picture shrinks a little and the background fades as you drag.
• Android's back button closes it, and so does VoiceOver's escape gesture.
• A tap hides the bars, so you can look at the picture alone.
• With reduced motion turned on, nothing slides. It switches straight away, and a gallery's autoplay stays still.

There's also Gallery, a small one for a chat message or a feed. It shows one picture at a time in a box, and a tap opens the lightbox out of it.

Install

npm install react-native-motion-lightbox

You also need react-native-reanimated 4.5 or newer, react-native-gesture-handler 2.32 or newer, and react-native-worklets. In an Expo app, install them with npx expo install so you get versions that match your SDK. It doesn't use any Expo modules, so it works in a bare app too.

Your app needs a GestureHandlerRootView at the top, as Gesture Handler always does.

Gallery

import { Gallery } from 'react-native-motion-lightbox'

<Gallery
  items={[
    { kind: 'image', src: 'https://example.com/fjord.jpg', width: 5200, height: 3464, alt: 'A fjord' },
    { kind: 'image', src: 'https://example.com/harbour.jpg', width: 6000, height: 4000, alt: 'The harbour' },
  ]}
  aspect={4 / 3}
  fit="contain"
  peek={28}
  gap={6}
  caption={(item) => item.alt}
  onLongPress={(i) => openMessageMenu(i)}
/>

Swipe it, and tap a picture to open the lightbox. A swipe never counts as a tap. A swipe that goes mostly up or down is left to the screen, so a list around the gallery still scrolls.

It takes the same props as the lightbox and passes them on. On top of those:

Prop
aspect	A picture's width over its height. Default 1, a square.
fit	'cover' (the default) fills the box with the part of each picture that focus and zoom pick. 'contain' shows the whole picture inside the box.
peek	How many points of the next picture show at the right edge, so it reads as something to swipe. Default 0.
gap	The space between pictures, in points. Default 12.
onPress(index)	Called on a tap instead of opening the lightbox, if your app has a viewer of its own.
onLongPress(index)	Called on a long press, for a menu.
autoplay	Move on by itself every this many milliseconds, like 6000. Off by default. It holds while a finger is on it or the lightbox is open, and adds a pause button.
style	Goes on the gallery's outer view. Give it a width, or let it fill its parent.

Each picture can have a focus and a zoom. focus is the point the box centres on, as fractions across and down, and zoom is how far it zooms in on it. With fit="cover", the lightbox opens out of exactly that part and then shows the whole picture.

Lightbox on its own

For a grid or a list of your own, measure the thumbnail when it opens and closes, and pass that as origin:

const cells = useRef<(View | null)[]>([])
const origin = (i: number) =>
  new Promise<Rect | undefined>((resolve) => {
    const cell = cells.current[i]
    if (!cell) return resolve(undefined)
    cell.measureInWindow((x, y, width, height) => resolve({ x, y, width, height }))
  })

<Lightbox
  items={items}
  index={index}
  open={open}
  onClose={() => setOpen(false)}
  onIndexChange={setIndex}
  origin={origin}
  caption={(item) => item.alt}
/>

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