Add useComposedEventHandler hook

__typetests__/common/useComposedEventHandlerTest.tsx

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+/* eslint-disable no-unused-expressions */
+/* eslint-disable @typescript-eslint/no-empty-function */
+/* eslint-disable @typescript-eslint/ban-ts-comment */
+/* eslint-disable @typescript-eslint/no-unused-vars */
+import React from 'react';
+import Animated, {
+  useAnimatedScrollHandler,
+  useComposedEventHandler,
+  useEvent,
+} from '../..';
+import { Text } from 'react-native';
+import type { ReanimatedEvent } from '../..';
+
+function useComposedEventHandlerTest() {
+  function useComposedEventHandlerTestDifferentHandlers() {
+    function useCustomScrollHandler(
+      handler: (event: ReanimatedEvent<object>) => void
+    ) {
+      return useEvent(
+        (event) => {
+          'worklet';
+          handler(event);
+        },
+        ['onScroll']
+      );
+    }
+
+    const onScrollCustomHandler = useCustomScrollHandler((e) => {
+      'worklet';
+      console.log(`custom scroll handler invoked on ${e.eventName}`);
+    });
+
+    const onScrollHandler = useAnimatedScrollHandler((e) => {
+      console.log(`scroll handler invoked on ${e.eventName}`);
+    });
+
+    const composedHandler = useComposedEventHandler([
+      onScrollHandler,
+      onScrollCustomHandler,
+    ]);
+
+    return (
+      <>
+        <Animated.ScrollView onScroll={composedHandler}>
+          {[...new Array(20)].map((_each, index) => (
+            <Text>{index}</Text>
+          ))}
+        </Animated.ScrollView>
+      </>
+    );
+  }
+
+  function useComposedEventHandlerTestDifferentProps() {
+    const onDragBeginHandler = useAnimatedScrollHandler({
+      onBeginDrag(e) {
+        'worklet';
+        console.log('Drag begin');
+      },
+    });
+
+    const onDragEndHandler = useAnimatedScrollHandler({
+      onEndDrag(e) {
+        'worklet';
+        console.log('Drag end');
+      },
+    });
+
+    const composedHandler1 = useComposedEventHandler([
+      onDragBeginHandler,
+      onDragEndHandler,
+    ]);
+
+    const composedHandler2 = useComposedEventHandler([
+      onDragBeginHandler,
+      onDragEndHandler,
+    ]);
+
+    return (
+      <>
+        <Animated.ScrollView
+          // This will work well thanks to the way it is filtered in `PropsFilter`.
+          onMomentumScrollBegin={composedHandler1}
+          // same as above
+          onMomentumScrollEnd={composedHandler2}>
+          {[...new Array(20)].map((_each, index) => (
+            <Text>{index}</Text>
+          ))}
+        </Animated.ScrollView>
+      </>
+    );
+  }
+}

app/src/examples/ComposedHandlerConditionalExample.tsx

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+import React from 'react';
+import { Text, View, StyleSheet, Button } from 'react-native';
+import Animated, {
+  useAnimatedScrollHandler,
+  useComposedEventHandler,
+} from 'react-native-reanimated';
+
+export default function ComposedHandlerConditionalExample() {
+  const [toggleFirst, setToggleFirst] = React.useState(true);
+  const [toggleSecond, setToggleSecond] = React.useState(true);
+  const [toggleThird, setToggleThird] = React.useState(true);
+
+  const handlerFunc = React.useCallback(
+    (handlerName: string, eventName: string) => {
+      'worklet';
+      console.log(`${handlerName} handler: ${eventName}`);
+    },
+    []
+  );
+
+  const firstHandler = useAnimatedScrollHandler({
+    onScroll(e) {
+      handlerFunc('first', e.eventName);
+    },
+  });
+
+  const secondHandler = useAnimatedScrollHandler({
+    onScroll(e) {
+      handlerFunc('second', e.eventName);
+    },
+  });
+
+  const thirdHandler = useAnimatedScrollHandler({
+    onScroll(e) {
+      handlerFunc('third', e.eventName);
+    },
+  });
+
+  const composedHandler = useComposedEventHandler([
+    toggleFirst ? firstHandler : null,
+    toggleSecond ? secondHandler : null,
+    toggleThird ? thirdHandler : null,
+  ]);
+
+  return (
+    <View style={styles.container}>
+      <Text style={styles.infoText}>Check console logs!</Text>
+      <ToggleButton
+        name={'first'}
+        isToggled={toggleFirst}
+        onPressFunc={() => setToggleFirst(!toggleFirst)}
+      />
+      <ToggleButton
+        name={'second'}
+        isToggled={toggleSecond}
+        onPressFunc={() => setToggleSecond(!toggleSecond)}
+      />
+      <ToggleButton
+        name={'third'}
+        isToggled={toggleThird}
+        onPressFunc={() => setToggleThird(!toggleThird)}
+      />
+      <Animated.FlatList
+        onScroll={composedHandler}
+        style={styles.list}
+        data={items}
+        renderItem={({ item }) => <Item title={item.title} />}
+        keyExtractor={(item) => `A:${item.title}`}
+      />
+    </View>
+  );
+}
+
+type ToggleProps = {
+  name: string;
+  isToggled: boolean;
+  onPressFunc: () => void;
+};
+const ToggleButton = ({ name, isToggled, onPressFunc }: ToggleProps) => (
+  <View style={styles.toggleContainer}>
+    <View
+      style={[
+        styles.toggleIcon,
+        isToggled ? styles.toggleON : styles.toggleOFF,
+      ]}
+    />
+    <Button
+      title={`Toggle ${name} handler ${isToggled ? 'OFF' : 'ON'}`}
+      onPress={onPressFunc}
+    />
+  </View>
+);
+
+type ItemValue = { title: string };
+const items: ItemValue[] = [...new Array(101)].map((_each, index) => {
+  return { title: `${index}` };
+});
+
+type ItemProps = { title: string };
+const Item = ({ title }: ItemProps) => (
+  <View style={styles.item}>
+    <Text style={styles.title}>{title}</Text>
+  </View>
+);
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    flexDirection: 'column',
+  },
+  infoText: {
+    fontSize: 19,
+    alignSelf: 'center',
+  },
+  list: {
+    flex: 1,
+  },
+  item: {
+    backgroundColor: '#883ef0',
+    alignItems: 'center',
+    padding: 20,
+    marginVertical: 8,
+    marginHorizontal: 16,
+    borderRadius: 20,
+  },
+  title: {
+    fontSize: 32,
+  },
+  toggleContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  toggleIcon: {
+    width: 20,
+    height: 20,
+    borderRadius: 10,
+    borderWidth: 3,
+    borderColor: 'black',
+  },
+  toggleON: {
+    backgroundColor: '#7CFC00',
+  },
+  toggleOFF: {
+    backgroundColor: 'red',
+  },
+});

app/src/examples/ComposedHandlerDifferentEventsExample.tsx

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+import React from 'react';
+import { Text, View, StyleSheet } from 'react-native';
+import Animated, {
+  useAnimatedScrollHandler,
+  useComposedEventHandler,
+} from 'react-native-reanimated';
+
+export default function ComposedHandlerDifferentEventsExample() {
+  const handlerFunc = React.useCallback(
+    (handlerName: string, eventName: string) => {
+      'worklet';
+      console.log(`${handlerName} handler: ${eventName}`);
+    },
+    []
+  );
+
+  const onScrollHandler = useAnimatedScrollHandler({
+    onScroll(e) {
+      handlerFunc('scroll', e.eventName);
+    },
+  });
+
+  const onDragHandler = useAnimatedScrollHandler({
+    onBeginDrag(e) {
+      handlerFunc('drag', e.eventName);
+    },
+    onEndDrag(e) {
+      handlerFunc('drag', e.eventName);
+    },
+  });
+
+  const onMomentumHandler = useAnimatedScrollHandler({
+    onMomentumBegin(e) {
+      handlerFunc('momentum', e.eventName);
+    },
+    onMomentumEnd(e) {
+      handlerFunc('momentum', e.eventName);
+    },
+  });
+
+  const composedHandler = useComposedEventHandler([
+    onScrollHandler,
+    onDragHandler,
+    onMomentumHandler,
+  ]);
+
+  return (
+    <View style={styles.container}>
+      <Text style={styles.infoText}>Check console logs!</Text>
+      <Animated.FlatList
+        onScroll={composedHandler}
+        style={styles.list}
+        data={items}
+        renderItem={({ item }) => <Item title={item.title} />}
+        keyExtractor={(item) => `A:${item.title}`}
+      />
+    </View>
+  );
+}
+
+type ItemValue = { title: string };
+const items: ItemValue[] = [...new Array(101)].map((_each, index) => {
+  return { title: `${index}` };
+});
+
+type ItemProps = { title: string };
+const Item = ({ title }: ItemProps) => (
+  <View style={styles.item}>
+    <Text style={styles.title}>{title}</Text>
+  </View>
+);
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    flexDirection: 'column',
+  },
+  infoText: {
+    fontSize: 19,
+    alignSelf: 'center',
+  },
+  list: {
+    flex: 1,
+  },
+  item: {
+    backgroundColor: '#66e3c0',
+    alignItems: 'center',
+    padding: 20,
+    marginVertical: 8,
+    marginHorizontal: 16,
+    borderRadius: 20,
+  },
+  title: {
+    fontSize: 32,
+  },
+});