70 lines
2.2 KiB
Markdown
70 lines
2.2 KiB
Markdown
<table>
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<tr>
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<th><a href="../README.md">README.md</a></th>
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<th>ANIMATED.md</th>
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<th><a href="./DEVICES.md">DEVICES.md</a></th>
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<th><a href="./FORMATS.md">FORMATS.md</a></th>
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<th><a href="./ERRORS.md">ERRORS.md</a></th>
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</tr>
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</table>
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<br />
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## Animations
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Often you'd want to animate specific props in the Camera. For example, if you'd want to create a custom zoom gesture, you can smoothly animate the Camera's `zoom` property.
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The following example uses [react-native-reanimated](https://github.com/software-mansion/react-native-reanimated) (v2) to animate the `zoom` property:
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```tsx
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import Reanimated, {
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useAnimatedProps,
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useSharedValue,
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withSpring,
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} from "react-native-reanimated";
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const ReanimatedCamera = Reanimated.createAnimatedComponent(Camera);
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Reanimated.addWhitelistedNativeProps({
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zoom: true,
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});
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export const App = () => {
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const zoom = useSharedValue(0);
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const onRandomZoomPress = useCallback(() => {
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zoom.value = withSpring(Math.random());
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}, []);
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const animatedProps = useAnimatedProps<Partial<CameraProps>>(
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() => ({ zoom: zoom.value }),
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[zoom]
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);
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return (
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<>
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<ReanimatedCamera
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style={StyleSheet.absoluteFill}
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device={device}
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isActive={true}
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{...{ animatedProps }}
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/>
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<TouchableOpacity
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style={styles.zoomButton}
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onPress={onRandomZoomPress}>
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<Text>Zoom randomly!</Text>
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</TouchableOpacity>
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</>
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)
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}
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```
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### Implementation
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1. The `Camera` is converted to a reanimated Camera using `Reanimated.createAnimatedComponent`
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2. The `zoom` property is added to the whitelisted native props to make it animatable.
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> Note that this might not be needed in the future, see: [reanimated#1409](https://github.com/software-mansion/react-native-reanimated/pull/1409)
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3. Using [`useSharedValue`](https://docs.swmansion.com/react-native-reanimated/docs/api/useSharedValue), we're creating a shared value that holds the `zoom` property.
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4. Using the [`useAnimatedProps`](https://docs.swmansion.com/react-native-reanimated/docs/api/useAnimatedProps) hook, we apply the shared value to the animated props.
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5. We apply the animated props to the `ReanimatedCamera` component using the spread syntax.
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