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App.js
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import React, {useRef, useMemo, useState, useCallback, useEffect} from 'react';
import {View, StyleSheet, Dimensions, Text} from 'react-native';
import {
PanGestureHandler,
State,
NativeViewGestureHandler,
PanGestureHandlerStateChangeEvent,
} from 'react-native-gesture-handler';
import Animated, {Easing} from 'react-native-reanimated';
const {cond, eq, block, set, add, timing, SpringUtils} = Animated;
const window = Dimensions.get('window');
function useAnimatedEvent(nativeEvent: any) {
return useMemo(
() =>
Animated.event(
[
{
nativeEvent,
},
],
{useNativeDriver: true},
),
[nativeEvent],
);
}
function useAnimatedValue(
value: number,
useListener?: boolean,
debugLabel?: string,
) {
const lastValue = useRef(null);
const animatedValue = useMemo(() => new Animated.Value(value), [value]);
useEffect(() => {
if (!useListener) {
return;
}
const animatedAlways = Animated.always(
Animated.call([animatedValue], ([val]) => {
lastValue.current = val;
if (debugLabel) {
console.log(debugLabel, val);
}
}),
);
animatedAlways.__attach();
// return undo function
return () => animatedAlways.__detach();
}, [animatedValue, debugLabel, useListener]);
animatedValue.getValue = () => lastValue.current;
return animatedValue;
}
const s = StyleSheet.create({
root: {
paddingTop: 20,
flex: 1,
},
scrollContent: {
// flexDirection: 'row',
// flexWrap: 'wrap',
},
box: {
height: 150,
width: window.width / 2,
backgroundColor: 'red',
borderWidth: 1,
borderColor: '#ccc',
},
});
const items = Array.from({length: 16}, (_, index) => index);
function useSpring(value: Animated.Value, config: {toValue: number}) {
return useMemo(() => {
return Animated.spring(value, {
tension: 90,
friction: 30,
...config,
// useNativeDriver: true,
});
}, [config, value]);
}
// function useTiming(
// value: Animated.Value,
// config: { toValue: number },
// ) {
// return useMemo(() => {
// return Animated.timing(value, {
// // tension: 90,
// // friction: 30,
// ...config,
// // useNativeDriver: true,
// });
// }, []);
// }
const REFRESH_HEIGHT = 120;
const App = () => {
const [isRefreshing, setIsRefreshing] = useState(false);
const panY = useAnimatedValue(0, true, 'Pan');
const marginTop = useAnimatedValue(0, true, 'Margin');
const scrollY = useAnimatedValue(0, true, 'Scroll');
const gestureState = useAnimatedValue(-1, true);
// const _transX = useAnimatedValue(0, true, 'TransX');
const onGestureEvent = useAnimatedEvent({
state: gestureState,
translationY: panY,
});
const onScrollEvent = useAnimatedEvent({
contentOffset: {y: scrollY},
});
const marginTopWithOffset = cond(
eq(gestureState, State.END),
block([set(marginTop, add(marginTop, panY)), marginTop]),
add(marginTop, panY),
);
// const refreshEndAnimation = useTiming(panY, {
// toValue: 0,
// });
// // const refreshEndAnimation = useSpring(panY, {
// // toValue: 0,
// // });
// const refreshAnimation = useSpring(panY, {
// toValue: REFRESH_HEIGHT,
// });
const onHandlerStateChange = useCallback(
(event: PanGestureHandlerStateChangeEvent) => {
if (event.nativeEvent.state === State.END) {
const q2 = marginTop.getValue();
if (+scrollY.getValue() - +panY.getValue() <= 0) {
// if (scrollY.getValue() <= 0) {
const panValue = panY.getValue();
if (panValue >= REFRESH_HEIGHT) {
setIsRefreshing(true);
Animated.timing(panY, {
tension: 90,
friction: 30,
toValue: REFRESH_HEIGHT,
duration: 100,
easing: Easing.inOut(Easing.ease),
}).start(i => {
// if(panValue !== panY.getValue()){
// return
// }
setTimeout(() => {
setIsRefreshing(false);
const st = panY.getValue();
const sq = scrollY.getValue();
if (REFRESH_HEIGHT - scrollY.getValue() >= 0) {
Animated.timing(panY, {
tension: 90,
friction: 30,
toValue: 0,
duration: 100,
easing: Easing.inOut(Easing.ease),
}).start(i => {});
} else {
// scrollY.setValue(0);
}
}, 4000);
});
// setIsRefreshing(true);
// refreshAnimation.start(() => {
// // do request here
// setTimeout(() => {
// // call after request
// setIsRefreshing(false);
// refreshEndAnimation.start();
// }, 1000);
// });
} else {
Animated.timing(panY, {
tension: 90,
friction: 30,
toValue: 0,
duration: 100,
easing: Easing.inOut(Easing.ease),
}).start(i => {
scrollY.setValue(0);
});
}
}
}
},
[marginTop, panY, scrollY],
);
return (
<PanGestureHandler
id="pan"
enabled={!isRefreshing}
onGestureEvent={onGestureEvent}
simultaneousHandlers={['scroll']}
onHandlerStateChange={onHandlerStateChange}>
<Animated.View style={[s.root]}>
<NativeViewGestureHandler id="scroll" simultaneousHandlers={['pan']}>
<Animated.ScrollView bounces={false} onScroll={onScrollEvent}>
<Animated.View
style={[
{
paddingTop: marginTopWithOffset,
},
]}>
{items.map((item, index) => (
<View style={s.box} key={item}>
<Text>{index}</Text>
</View>
))}
</Animated.View>
</Animated.ScrollView>
</NativeViewGestureHandler>
</Animated.View>
</PanGestureHandler>
);
};
export default App;