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import _extends from '@babel/runtime/helpers/esm/extends';
import * as React from 'react';
import * as ReactDOM from 'react-dom/client';
import { useThree, useFrame, context as context$1 } from '@react-three/fiber';
import { easing } from 'maath';
const context = /* @__PURE__ */React.createContext(null);
function useScroll() {
return React.useContext(context);
}
function ScrollControls({
eps = 0.00001,
enabled = true,
infinite,
horizontal,
pages = 1,
distance = 1,
damping = 0.25,
maxSpeed = Infinity,
prepend = false,
style = {},
children
}) {
const {
get,
setEvents,
gl,
size,
invalidate,
events
} = useThree();
const [el] = React.useState(() => document.createElement('div'));
const [fill] = React.useState(() => document.createElement('div'));
const [fixed] = React.useState(() => document.createElement('div'));
const target = gl.domElement.parentNode;
const scroll = React.useRef(0);
const state = React.useMemo(() => {
const state = {
el,
eps,
fill,
fixed,
horizontal,
damping,
offset: 0,
delta: 0,
scroll,
pages,
// 0-1 for a range between from -> from + distance
range(from, distance, margin = 0) {
const start = from - margin;
const end = start + distance + margin * 2;
return this.offset < start ? 0 : this.offset > end ? 1 : (this.offset - start) / (end - start);
},
// 0-1-0 for a range between from -> from + distance
curve(from, distance, margin = 0) {
return Math.sin(this.range(from, distance, margin) * Math.PI);
},
// true/false for a range between from -> from + distance
visible(from, distance, margin = 0) {
const start = from - margin;
const end = start + distance + margin * 2;
return this.offset >= start && this.offset <= end;
}
};
return state;
}, [eps, damping, horizontal, pages]);
React.useEffect(() => {
el.style.position = 'absolute';
el.style.width = '100%';
el.style.height = '100%';
el.style[horizontal ? 'overflowX' : 'overflowY'] = 'auto';
el.style[horizontal ? 'overflowY' : 'overflowX'] = 'hidden';
el.style.top = '0px';
el.style.left = '0px';
for (const key in style) {
el.style[key] = style[key];
}
fixed.style.position = 'sticky';
fixed.style.top = '0px';
fixed.style.left = '0px';
fixed.style.width = '100%';
fixed.style.height = '100%';
fixed.style.overflow = 'hidden';
el.appendChild(fixed);
fill.style.height = horizontal ? '100%' : `${pages * distance * 100}%`;
fill.style.width = horizontal ? `${pages * distance * 100}%` : '100%';
fill.style.pointerEvents = 'none';
el.appendChild(fill);
if (prepend) target.prepend(el);else target.appendChild(el);
// Init scroll one pixel in to allow upward/leftward scroll
el[horizontal ? 'scrollLeft' : 'scrollTop'] = 1;
const oldTarget = events.connected || gl.domElement;
requestAnimationFrame(() => events.connect == null ? void 0 : events.connect(el));
const oldCompute = get().events.compute;
setEvents({
compute(event, state) {
// we are using boundingClientRect because we could not rely on target.offsetTop as canvas could be positioned anywhere in dom
const {
left,
top
} = target.getBoundingClientRect();
const offsetX = event.clientX - left;
const offsetY = event.clientY - top;
state.pointer.set(offsetX / state.size.width * 2 - 1, -(offsetY / state.size.height) * 2 + 1);
state.raycaster.setFromCamera(state.pointer, state.camera);
}
});
return () => {
target.removeChild(el);
setEvents({
compute: oldCompute
});
events.connect == null || events.connect(oldTarget);
};
}, [pages, distance, horizontal, el, fill, fixed, target]);
React.useEffect(() => {
if (events.connected === el) {
const containerLength = size[horizontal ? 'width' : 'height'];
const scrollLength = el[horizontal ? 'scrollWidth' : 'scrollHeight'];
const scrollThreshold = scrollLength - containerLength;
let current = 0;
let disableScroll = true;
let firstRun = true;
const onScroll = () => {
// Prevent first scroll because it is indirectly caused by the one pixel offset
if (!enabled || firstRun) return;
invalidate();
current = el[horizontal ? 'scrollLeft' : 'scrollTop'];
scroll.current = current / scrollThreshold;
if (infinite) {
if (!disableScroll) {
if (current >= scrollThreshold) {
const damp = 1 - state.offset;
el[horizontal ? 'scrollLeft' : 'scrollTop'] = 1;
scroll.current = state.offset = -damp;
disableScroll = true;
} else if (current <= 0) {
const damp = 1 + state.offset;
el[horizontal ? 'scrollLeft' : 'scrollTop'] = scrollLength;
scroll.current = state.offset = damp;
disableScroll = true;
}
}
if (disableScroll) setTimeout(() => disableScroll = false, 40);
}
};
el.addEventListener('scroll', onScroll, {
passive: true
});
requestAnimationFrame(() => firstRun = false);
const onWheel = e => el.scrollLeft += e.deltaY / 2;
if (horizontal) el.addEventListener('wheel', onWheel, {
passive: true
});
return () => {
el.removeEventListener('scroll', onScroll);
if (horizontal) el.removeEventListener('wheel', onWheel);
};
}
}, [el, events, size, infinite, state, invalidate, horizontal, enabled]);
let last = 0;
useFrame((_, delta) => {
last = state.offset;
easing.damp(state, 'offset', scroll.current, damping, delta, maxSpeed, undefined, eps);
easing.damp(state, 'delta', Math.abs(last - state.offset), damping, delta, maxSpeed, undefined, eps);
if (state.delta > eps) invalidate();
});
return /*#__PURE__*/React.createElement(context.Provider, {
value: state
}, children);
}
const ScrollCanvas = /* @__PURE__ */React.forwardRef(({
children
}, ref) => {
const group = React.useRef(null);
React.useImperativeHandle(ref, () => group.current, []);
const state = useScroll();
const {
width,
height
} = useThree(state => state.viewport);
useFrame(() => {
group.current.position.x = state.horizontal ? -width * (state.pages - 1) * state.offset : 0;
group.current.position.y = state.horizontal ? 0 : height * (state.pages - 1) * state.offset;
});
return /*#__PURE__*/React.createElement("group", {
ref: group
}, children);
});
const ScrollHtml = /*#__PURE__*/React.forwardRef(({
children,
style,
...props
}, ref) => {
const state = useScroll();
const group = React.useRef(null);
React.useImperativeHandle(ref, () => group.current, []);
const {
width,
height
} = useThree(state => state.size);
const fiberState = React.useContext(context$1);
const root = React.useMemo(() => ReactDOM.createRoot(state.fixed), [state.fixed]);
useFrame(() => {
if (state.delta > state.eps) {
group.current.style.transform = `translate3d(${state.horizontal ? -width * (state.pages - 1) * state.offset : 0}px,${state.horizontal ? 0 : height * (state.pages - 1) * -state.offset}px,0)`;
}
});
root.render(/*#__PURE__*/React.createElement("div", _extends({
ref: group,
style: {
...style,
position: 'absolute',
top: 0,
left: 0,
willChange: 'transform'
}
}, props), /*#__PURE__*/React.createElement(context.Provider, {
value: state
}, /*#__PURE__*/React.createElement(context$1.Provider, {
value: fiberState
}, children))));
return null;
});
const Scroll = /* @__PURE__ */React.forwardRef(({
html,
...props
}, ref) => {
const El = html ? ScrollHtml : ScrollCanvas;
return /*#__PURE__*/React.createElement(El, _extends({
ref: ref
}, props));
});
export { Scroll, ScrollControls, useScroll };
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