Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { Gesture } from 'react-native-gesture-handler';
import {
interpolate,
runOnJS,
SharedValue,
useSharedValue,
withSpring,
withTiming,
} from 'react-native-reanimated';
import { AnimatedPendingRequestCardData, SwipeDirection } from '@/types/card';
import {
CARD_TYPE_NEW_REQUEST,
EXIT_SPRING,
EXIT_X_MULTIPLIER,
HORIZONTAL_LIMIT,
MIN_THRESHOLD,
SNAP_BACK_SPRING,
STEP_UP_SPRING,
SWIPE_X_THRESHOLD,
SWIPE_Y_THRESHOLD,
VELOCITY_THRESHOLD,
} from '../constants';
export interface UseSwipeGestureProps {
index: number;
currentIndex: number;
data: AnimatedPendingRequestCardData;
width: number;
height: number;
animatedValue: SharedValue<number>;
listZIndex: SharedValue<number>;
onSwipeLeftEnd?: (item: AnimatedPendingRequestCardData) => void;
onSwipeRightEnd?: (item: AnimatedPendingRequestCardData) => void;
onMoveToBack?: (item: AnimatedPendingRequestCardData) => void;
}
export const useSwipeGesture = ({
index,
currentIndex,
data,
width,
height,
animatedValue,
listZIndex,
onSwipeLeftEnd,
onSwipeRightEnd,
onMoveToBack,
}: UseSwipeGestureProps) => {
const translateX = useSharedValue(0);
const translateY = useSharedValue(0);
const direction = useSharedValue(0);
const [swipeDirection, setSwipeDirection] = useState<SwipeDirection>(null);
// Reset all values when currentIndex changes (e.g., when looping back to start)
useEffect(() => {
if (currentIndex !== index) {
translateX.value = 0;
translateY.value = 0;
direction.value = 0;
setSwipeDirection(null);
} else {
// When item becomes current, ensure animatedValue is synced
animatedValue.value = currentIndex;
}
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [currentIndex, index, animatedValue]);
const onSwipeLeftHandler = useCallback(
(item: AnimatedPendingRequestCardData) => {
onSwipeLeftEnd?.(item);
},
[onSwipeLeftEnd],
);
const onSwipeRightHandler = useCallback(
(item: AnimatedPendingRequestCardData) => {
onSwipeRightEnd?.(item);
},
[onSwipeRightEnd],
);
const onMoveToBackHandler = useCallback(
(item: AnimatedPendingRequestCardData) => {
onMoveToBack?.(item);
},
[onMoveToBack],
);
const scrollGesture = Gesture.Pan();
const pan = Gesture.Pan()
.simultaneousWithExternalGesture(scrollGesture)
.onBegin(() => {})
.onUpdate(event => {
if (currentIndex !== index) return;
const { translationX: dx, translationY: dy } = event;
translateX.value = dx;
translateY.value = dy;
const absDx = Math.abs(dx);
const absDy = Math.abs(dy);
const isVertical = absDy > absDx && absDy > MIN_THRESHOLD && absDx < HORIZONTAL_LIMIT;
const isHorizontal = absDx > MIN_THRESHOLD;
// Handle no clear direction - reset swipe indicator
if (!isVertical && !isHorizontal) {
runOnJS(setSwipeDirection)(null);
return;
}
// Confirmed swipe intent — raise list above mascot now (not on mere touch)
if (listZIndex.value === 0) {
listZIndex.value = 100;
}
// Handle vertical swipe
if (isVertical) {
direction.value = dy > 0 ? 2 : -2;
runOnJS(setSwipeDirection)(direction.value > 0 ? 'down' : 'up');
animatedValue.value = interpolate(absDy, [0, height], [index, index + 1]);
return;
}
// Handle horizontal swipe
direction.value = dx > 0 ? 1 : -1;
runOnJS(setSwipeDirection)(direction.value > 0 ? 'right' : 'left');
animatedValue.value = interpolate(absDx, [0, width], [index, index + 1]);
})
.onEnd(event => {
if (currentIndex !== index) return;
const { translationX: dx, translationY: dy, velocityX, velocityY } = event;
const absDx = Math.abs(dx);
const absDy = Math.abs(dy);
const isVertical = absDy > absDx && absDx < HORIZONTAL_LIMIT;
const shouldSwipe =
absDx > SWIPE_X_THRESHOLD ||
absDy > SWIPE_Y_THRESHOLD ||
Math.abs(velocityX) > VELOCITY_THRESHOLD ||
Math.abs(velocityY) > VELOCITY_THRESHOLD;
// Early return: Reset if swipe threshold not met
if (!shouldSwipe) {
translateX.value = withSpring(0, { ...SNAP_BACK_SPRING, velocity: velocityX });
translateY.value = withSpring(0, { ...SNAP_BACK_SPRING, velocity: velocityY });
animatedValue.value = withTiming(currentIndex);
direction.value = 0;
runOnJS(setSwipeDirection)(null);
return;
}
const isLoopCard = data.type === CARD_TYPE_NEW_REQUEST;
// Handle loop card swipe
if (isLoopCard) {
runOnJS(onMoveToBackHandler)?.(data);
animatedValue.value = withSpring(index + 1, STEP_UP_SPRING);
translateX.value = withSpring(0, SNAP_BACK_SPRING);
translateY.value = withSpring(height * (direction.value >= 0 ? 0.5 : -0.5), {
...EXIT_SPRING,
velocity: velocityY,
});
return;
}
// Handle vertical swipe
if (isVertical) {
runOnJS(onMoveToBackHandler)?.(data);
animatedValue.value = withSpring(index + 1, STEP_UP_SPRING);
translateY.value = withSpring(height * (direction.value >= 0 ? 0.5 : -0.5), {
...EXIT_SPRING,
velocity: velocityY,
});
return;
}
// Handle horizontal swipe (left/right) — fire callback immediately so data
// updates while animation plays independently (Slack-style decoupling)
if (direction.value < 0) {
runOnJS(onSwipeLeftHandler)?.(data);
} else {
runOnJS(onSwipeRightHandler)(data);
}
const exitX = width * direction.value * EXIT_X_MULTIPLIER;
animatedValue.value = withSpring(index + 1, STEP_UP_SPRING);
translateY.value = withSpring(translateY.value + velocityY * 0.03, {
...EXIT_SPRING,
velocity: velocityY,
});
translateX.value = withSpring(exitX, { ...EXIT_SPRING, velocity: velocityX });
})
.onFinalize(() => {
if (currentIndex !== index) return;
listZIndex.value = 0;
});
return {
pan,
scrollGesture,
swipeDirection,
setSwipeDirection,
translateX,
translateY,
direction,
};
};
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