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August 25, 2020 12:24
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import React, { useCallback, useState } from 'react'; | |
import Animated, { | |
measure, | |
cancelAnimation, | |
useAnimatedRef, | |
useSharedValue, | |
useDerivedValue, | |
withTiming, | |
Easing, | |
useAnimatedStyle, | |
interpolate, | |
Extrapolate, | |
useAnimatedGestureHandler | |
} from 'react-native-reanimated'; | |
import { PanGestureHandler } from 'react-native-gesture-handler'; | |
import { ViewStyleProp } from '../../../../types'; | |
import { PropsWithChildren } from 'react'; | |
import { StyleSheet } from 'react-native'; | |
import { Icon } from '../..'; | |
const DEFAULTS = Object.freeze({ | |
SWIPE_THRESHOLD: 0.5, | |
ACTIVATION_THRESHOLD: 8, | |
ANIMATION_DURATION: 0.05, | |
BORDER_RADIUS: 16, | |
LEFT_ICON_COLOR: 'rgba(255, 255, 255, 1)', | |
RIGHT_ICON_COLOR: 'rgba(255, 255, 255, 1)' | |
}); | |
type Callback = () => void; | |
export type SwipableRowProps = { | |
threshold?: number; | |
onSwipeLeft?: Callback; | |
onSwipeRight?: Callback; | |
} & ViewStyleProp; | |
export const SwipableRow = ({ | |
threshold = DEFAULTS.SWIPE_THRESHOLD, | |
children, | |
style, | |
onSwipeLeft: _onSwipeLeft, | |
onSwipeRight: _onSwipeRight | |
}: PropsWithChildren<SwipableRowProps>) => { | |
const viewRef = useAnimatedRef(); | |
const rowHeight = useSharedValue<undefined | number>(undefined); | |
const positionX = useSharedValue(0); | |
const swipeDirection = useSharedValue<'left' | 'right' | undefined>( | |
undefined | |
); | |
const _setInternalState = useState({})[1]; | |
const forceRerender = useCallback(() => { | |
_setInternalState({}); | |
}, [_setInternalState]); | |
const callbackWrapper = useCallback( | |
(callback: Callback) => { | |
forceRerender(); | |
callback(); | |
}, | |
[forceRerender] | |
); | |
const onSwipeLeft = useCallback(() => { | |
_onSwipeLeft && callbackWrapper(_onSwipeLeft); | |
}, [_onSwipeLeft, callbackWrapper]); | |
const onSwipeRight = useCallback(() => { | |
_onSwipeRight && callbackWrapper(_onSwipeRight); | |
}, [_onSwipeRight, callbackWrapper]); | |
const leftIconOpacity = useDerivedValue(() => { | |
return positionX.value > 0 ? 1 : 0; | |
}); | |
const rightIconOpacity = useDerivedValue(() => { | |
return positionX.value < 0 ? 1 : 0; | |
}); | |
const leftBorderRadius = useDerivedValue(() => { | |
return interpolate( | |
positionX.value, | |
[0, DEFAULTS.ACTIVATION_THRESHOLD], | |
[0, DEFAULTS.BORDER_RADIUS], | |
Extrapolate.CLAMP | |
); | |
}); | |
const callback = useCallback(() => { | |
console.log(`callback: start`); | |
setImmediate(() => { | |
console.log(`callback: should be called immediately`); | |
}); | |
console.log(`callback: end`); | |
}, []); | |
const magic = () => { | |
console.log(`magic`); | |
let num = 0; | |
const w = setInterval(() => { | |
if (num === 1) { | |
clearInterval(w); | |
} | |
num++; | |
}, 0); | |
}; | |
const rightBorderRadius = useDerivedValue(() => { | |
return interpolate( | |
positionX.value, | |
[-DEFAULTS.ACTIVATION_THRESHOLD, 0], | |
[DEFAULTS.BORDER_RADIUS, 0], | |
Extrapolate.CLAMP | |
); | |
}); | |
const gestureHandler = useAnimatedGestureHandler({ | |
onStart: (_, ctx) => { | |
cancelAnimation(positionX); | |
ctx.position = positionX.value; | |
}, | |
onActive: (event, ctx) => { | |
let translation = event.translationX; | |
const useThreshold = | |
Math.abs(ctx.position + translation) < DEFAULTS.ACTIVATION_THRESHOLD; | |
if (!ctx.swipeStarted) { | |
if (useThreshold) { | |
translation = 0; | |
} else { | |
ctx.swipeStarted = true; | |
} | |
} | |
positionX.value = ctx.position + translation; | |
}, | |
onEnd: (event, ctx) => { | |
const { width, height } = measure(viewRef); | |
rowHeight.value = height; | |
const moveDirection = Math.sign(event.velocityX); | |
const impulse = event.velocityX * DEFAULTS.ANIMATION_DURATION; | |
const possibleProgress = interpolate( | |
positionX.value + impulse, | |
[-width, width], | |
[-1, 1], | |
Extrapolate.CLAMP | |
); | |
const swipeThresholdPassed = Math.abs(possibleProgress) > threshold; | |
let toValue = 0; | |
if (swipeThresholdPassed) { | |
if (moveDirection === 0) { | |
toValue = Math.sign(possibleProgress) * width; | |
} else { | |
if (positionX.value > 0 && moveDirection > 0) { | |
toValue = moveDirection * width; | |
} else if (positionX.value < 0 && moveDirection < 0) { | |
toValue = moveDirection * width; | |
} | |
} | |
} | |
const isRunAnimation = positionX.value !== toValue; | |
positionX.value = withTiming( | |
toValue, | |
{ | |
duration: isRunAnimation ? 250 : 0, | |
easing: Easing.out(Easing.ease) | |
}, | |
(isFinished) => { | |
if (isFinished) { | |
ctx.swipeStarted = false; | |
callback(); | |
magic(); | |
// if (Math.abs(toValue) === width) { | |
// rowHeight.value = 0; | |
// } | |
// const sign = Math.sign(toValue); | |
// if (sign === 1) { | |
// swipeDirection.value = 'right'; | |
// } else if (sign === -1) { | |
// swipeDirection.value = 'left'; | |
// } | |
} | |
} | |
); | |
} | |
}); | |
const foregroundStyle = useAnimatedStyle(() => { | |
return { | |
borderTopLeftRadius: leftBorderRadius.value, | |
borderBottomLeftRadius: leftBorderRadius.value, | |
borderTopRightRadius: rightBorderRadius.value, | |
borderBottomRightRadius: rightBorderRadius.value, | |
transform: [{ translateX: positionX.value }] | |
}; | |
}); | |
const backgroundStyle = useAnimatedStyle(() => { | |
return { | |
backgroundColor: | |
positionX.value === 0 | |
? 'transparent' | |
: positionX.value > 0 | |
? 'rgba(45, 154, 252, 0.5)' | |
: 'rgba(252, 119, 110, 1)' | |
}; | |
}); | |
const containerStyle = useAnimatedStyle(() => { | |
return { | |
height: | |
rowHeight.value !== undefined | |
? withTiming( | |
rowHeight.value, | |
{ | |
duration: 250, | |
easing: Easing.out(Easing.ease) | |
}, | |
(isFinished) => { | |
if (isFinished) { | |
if (swipeDirection.value === 'left') { | |
onSwipeLeft(); | |
} else if (swipeDirection.value === 'right') { | |
onSwipeRight(); | |
} | |
} | |
} | |
) | |
: undefined | |
}; | |
}); | |
const leftIconStyle = useAnimatedStyle(() => { | |
return { | |
opacity: leftIconOpacity.value | |
}; | |
}); | |
const rightIconStyle = useAnimatedStyle(() => { | |
return { | |
opacity: rightIconOpacity.value | |
}; | |
}); | |
return ( | |
<Animated.View style={[styles.container, containerStyle]}> | |
<Animated.View style={[styles.background, backgroundStyle]}> | |
<Animated.View style={[styles.leftIcon, leftIconStyle]}> | |
<Icon iconName='check' iconColor={DEFAULTS.LEFT_ICON_COLOR} /> | |
</Animated.View> | |
<Animated.View style={[styles.rightIcon, rightIconStyle]}> | |
<Icon iconName='trash' iconColor={DEFAULTS.RIGHT_ICON_COLOR} /> | |
</Animated.View> | |
</Animated.View> | |
<PanGestureHandler onGestureEvent={gestureHandler}> | |
<Animated.View | |
ref={viewRef} | |
style={[style, styles.foreground, foregroundStyle]} | |
> | |
{children} | |
</Animated.View> | |
</PanGestureHandler> | |
</Animated.View> | |
); | |
}; | |
const styles = StyleSheet.create({ | |
container: { flexDirection: 'row' }, | |
background: { | |
...StyleSheet.absoluteFillObject, | |
flexDirection: 'row', | |
alignItems: 'center', | |
overflow: 'hidden' | |
}, | |
foreground: { | |
width: '100%', | |
overflow: 'hidden' | |
}, | |
leftIcon: { position: 'absolute', left: 24 }, | |
rightIcon: { position: 'absolute', right: 24 } | |
}); |
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