This is unreleased documentation for React Native next version.
For up-to-date documentation, see the latest version (0.63).
Version: next
InteractionManager
InteractionManager allows long-running work to be scheduled after any interactions/animations have completed. In particular, this allows JavaScript animations to run smoothly.
Applications can schedule tasks to run after interactions with the following:
InteractionManager.runAfterInteractions(()=>{
// ...long-running synchronous task...
});
Compare this to other scheduling alternatives:
requestAnimationFrame(): for code that animates a view over time.
setImmediate/setTimeout(): run code later, note this may delay animations.
runAfterInteractions(): run code later, without delaying active animations.
The touch handling system considers one or more active touches to be an 'interaction' and will delay runAfterInteractions() callbacks until all touches have ended or been cancelled.
InteractionManager also allows applications to register animations by creating an interaction 'handle' on animation start, and clearing it upon completion:
var handle = InteractionManager.createInteractionHandle();
// run animation... (`runAfterInteractions` tasks are queued)
runAfterInteractions takes either a plain callback function, or a PromiseTask object with a gen method that returns a Promise. If a PromiseTask is supplied, then it is fully resolved (including asynchronous dependencies that also schedule more tasks via runAfterInteractions) before starting on the next task that might have been queued up synchronously earlier.
By default, queued tasks are executed together in a loop in one setImmediate batch. If setDeadline is called with a positive number, then tasks will only be executed until the deadline (in terms of js event loop run time) approaches, at which point execution will yield via setTimeout, allowing events such as touches to start interactions and block queued tasks from executing, making apps more responsive.
import React, { useEffect } from"react";
import {
Alert,
Animated,
InteractionManager,
Platform,
StyleSheet,
Text,
View,
} from"react-native";
const instructions = Platform.select({
ios: "Press Cmd+R to reload,\n" + "Cmd+D or shake for dev menu",
android:
"Double tap R on your keyboard to reload,\n" +
"Shake or press menu button for dev menu",
});
const useMount = func => useEffect(() => func(), []);
// You can create a custom interaction/animation and add// support for InteractionManagerconst useCustomInteraction = (timeLocked = 2000) => {
useMount(() => {
const handle = InteractionManager.createInteractionHandle();
setTimeout(
() => InteractionManager.clearInteractionHandle(handle),
timeLocked
);
return() => InteractionManager.clearInteractionHandle(handle);
});
};
const Ball = ({ onInteractionIsDone }) => {
useCustomInteraction();
// Running a method after the interaction
useMount(() => {
InteractionManager.runAfterInteractions(() => onInteractionIsDone());
});
return<Animated.Viewstyle={[styles.ball]} />;
};
const App = () => {
return (
<Viewstyle={styles.container}><Text>{instructions}</Text><BallonInteractionIsDone={() => Alert.alert("Interaction is done")} />
</View>
);
};
const styles = StyleSheet.create({
container: { flex: 1, justifyContent: "center", alignItems: "center" },
ball: {
width: 100,
height: 100,
backgroundColor: "salmon",
borderRadius: 100,
},
});
exportdefault App;
Note: InteractionManager.runAfterInteractions() is not working properly on web. It triggers immediately without waiting until the interaction is finished.
A positive number will use setTimeout to schedule any tasks after the eventLoopRunningTime hits the deadline value, otherwise all tasks will be executed in one setImmediate batch (default).