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use-snap-points.ts
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use-snap-points.ts
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import React from 'react';
import { set } from './helpers';
import { TRANSITIONS, VELOCITY_THRESHOLD } from './constants';
import { useControllableState } from './use-controllable-state';
export function useSnapPoints({
activeSnapPointProp,
setActiveSnapPointProp,
snapPoints,
drawerRef,
overlayRef,
fadeFromIndex,
onSnapPointChange,
}: {
activeSnapPointProp?: number | string | null;
setActiveSnapPointProp?(snapPoint: number | null | string): void;
snapPoints?: (number | string)[];
fadeFromIndex?: number;
drawerRef: React.RefObject<HTMLDivElement>;
overlayRef: React.RefObject<HTMLDivElement>;
onSnapPointChange(activeSnapPointIndex: number): void;
}) {
const [activeSnapPoint, setActiveSnapPoint] = useControllableState<string | number | null>({
prop: activeSnapPointProp,
defaultProp: snapPoints?.[0],
onChange: setActiveSnapPointProp,
});
const isLastSnapPoint = React.useMemo(
() => activeSnapPoint === snapPoints?.[snapPoints.length - 1] ?? null,
[snapPoints, activeSnapPoint],
);
const shouldFade =
(snapPoints && snapPoints.length > 0 && fadeFromIndex && snapPoints[fadeFromIndex] === activeSnapPoint) ||
!snapPoints;
const activeSnapPointIndex = React.useMemo(
() => snapPoints?.findIndex((snapPoint) => snapPoint === activeSnapPoint) ?? null,
[snapPoints, activeSnapPoint],
);
const snapPointsOffset = React.useMemo(
() =>
snapPoints?.map((snapPoint) => {
const hasWindow = typeof window !== 'undefined';
const isPx = typeof snapPoint === 'string';
let snapPointAsNumber = 0;
if (isPx) {
snapPointAsNumber = parseInt(snapPoint, 10);
}
const height = isPx ? snapPointAsNumber : hasWindow ? snapPoint * window.innerHeight : 0;
if (hasWindow) {
return window.innerHeight - height;
}
return height;
}) ?? [],
[snapPoints],
);
const activeSnapPointOffset = React.useMemo(
() => (activeSnapPointIndex !== null ? snapPointsOffset?.[activeSnapPointIndex] : null),
[snapPointsOffset, activeSnapPointIndex],
);
const snapToPoint = React.useCallback(
(height: number) => {
const newSnapPointIndex = snapPointsOffset?.findIndex((snapPointHeight) => snapPointHeight === height) ?? null;
onSnapPointChange(newSnapPointIndex);
set(drawerRef.current, {
transition: `transform ${TRANSITIONS.DURATION}s cubic-bezier(${TRANSITIONS.EASE.join(',')})`,
transform: `translate3d(0, ${height}px, 0)`,
});
if (
snapPointsOffset &&
newSnapPointIndex !== snapPointsOffset.length - 1 &&
newSnapPointIndex !== fadeFromIndex
) {
set(overlayRef.current, {
transition: `opacity ${TRANSITIONS.DURATION}s cubic-bezier(${TRANSITIONS.EASE.join(',')})`,
opacity: '0',
});
} else {
set(overlayRef.current, {
transition: `opacity ${TRANSITIONS.DURATION}s cubic-bezier(${TRANSITIONS.EASE.join(',')})`,
opacity: '1',
});
}
setActiveSnapPoint(newSnapPointIndex !== null ? snapPoints?.[newSnapPointIndex] : null);
},
[drawerRef.current, snapPoints, snapPointsOffset, fadeFromIndex, overlayRef, setActiveSnapPoint],
);
React.useEffect(() => {
if (activeSnapPointProp) {
const newIndex = snapPoints?.findIndex((snapPoint) => snapPoint === activeSnapPointProp) ?? null;
if (snapPointsOffset && newIndex && typeof snapPointsOffset[newIndex] === 'number') {
snapToPoint(snapPointsOffset[newIndex] as number);
}
}
}, [activeSnapPointProp, snapPoints, snapPointsOffset, snapToPoint]);
function onRelease({
draggedDistance,
closeDrawer,
velocity,
}: {
draggedDistance: number;
closeDrawer: () => void;
velocity: number;
}) {
if (fadeFromIndex === undefined) return;
const currentPosition = activeSnapPointOffset - draggedDistance;
const isOverlaySnapPoint = activeSnapPointIndex === fadeFromIndex - 1;
const isFirst = activeSnapPointIndex === 0;
if (isOverlaySnapPoint) {
set(overlayRef.current, {
transition: `opacity ${TRANSITIONS.DURATION}s cubic-bezier(${TRANSITIONS.EASE.join(',')})`,
});
}
if (velocity > 2 && draggedDistance < 0) {
closeDrawer();
return;
}
if (velocity > 2 && draggedDistance > 0 && snapPointsOffset && snapPoints) {
snapToPoint(snapPointsOffset[snapPoints.length - 1] as number);
return;
}
// Find the closest snap point to the current position
const closestSnapPoint = snapPointsOffset?.reduce((prev, curr) => {
if (typeof prev !== 'number' || typeof curr !== 'number') return prev;
return Math.abs(curr - currentPosition) < Math.abs(prev - currentPosition) ? curr : prev;
});
if (velocity > VELOCITY_THRESHOLD && Math.abs(draggedDistance) < window.innerHeight * 0.4) {
// -1 = down, 1 = up, might need a better name
const dragDirection = draggedDistance > 0 ? 1 : -1;
// Don't do anything if we swipe upwards while being on the last snap point
if (dragDirection > 0 && isLastSnapPoint) {
snapToPoint(snapPointsOffset[snapPoints.length - 1]);
return;
}
if (isFirst && dragDirection < 0) {
closeDrawer();
}
if (activeSnapPointIndex === null) return;
snapToPoint(snapPointsOffset[activeSnapPointIndex + dragDirection]);
return;
}
snapToPoint(closestSnapPoint);
}
function onDrag({ draggedDistance }: { draggedDistance: number }) {
if (activeSnapPointOffset === null) return;
const newYValue = activeSnapPointOffset - draggedDistance;
set(drawerRef.current, {
transform: `translate3d(0, ${newYValue}px, 0)`,
});
}
function getPercentageDragged(absDraggedDistance: number, isDraggingDown: boolean) {
if (!snapPoints || typeof activeSnapPointIndex !== 'number' || !snapPointsOffset || fadeFromIndex === undefined)
return null;
// If this is true we are dragging to a snap point that is supposed to have an overlay
const isOverlaySnapPoint = activeSnapPointIndex === fadeFromIndex - 1;
const isOverlaySnapPointOrHigher = activeSnapPointIndex >= fadeFromIndex;
if (isOverlaySnapPointOrHigher && isDraggingDown) {
return 0;
}
// Don't animate, but still use this one if we are dragging away from the overlaySnapPoint
if (isOverlaySnapPoint && !isDraggingDown) return 1;
if (!shouldFade && !isOverlaySnapPoint) return null;
// Either fadeFrom index or the one before
const targetSnapPointIndex = isOverlaySnapPoint ? activeSnapPointIndex + 1 : activeSnapPointIndex - 1;
// Get the distance from overlaySnapPoint to the one before or vice-versa to calculate the opacity percentage accordingly
const snapPointDistance = isOverlaySnapPoint
? snapPointsOffset[targetSnapPointIndex] - snapPointsOffset[targetSnapPointIndex - 1]
: snapPointsOffset[targetSnapPointIndex + 1] - snapPointsOffset[targetSnapPointIndex];
const percentageDragged = absDraggedDistance / Math.abs(snapPointDistance);
if (isOverlaySnapPoint) {
return 1 - percentageDragged;
} else {
return percentageDragged;
}
}
return {
isLastSnapPoint,
activeSnapPoint,
shouldFade,
getPercentageDragged,
setActiveSnapPoint,
activeSnapPointIndex,
onRelease,
onDrag,
snapPointsOffset,
};
}