@attio/react-native-bottom-sheet-toolbox/dist/module/hooks/use-bottom-sheet-drag-gesture.js

"use strict";

import * as React from "react";
import { Dimensions } from "react-native";
import { Gesture } from "react-native-gesture-handler";
import { runOnJS, useAnimatedReaction, useSharedValue } from "react-native-reanimated";
import { useBottomSheetToolboxInternalContext } from "../context";
import { BottomSheetPositionBuiltInLockPriority, friction } from "../utils";
import { useBottomSheetPositionLock } from "./use-bottom-sheet-position-lock";
const LOCK_ID_NAMESPACE = "useBottomSheetDragGesture";

// Gesture velocity is calculated between gesture updates.
// If the user does not move their finger, the gesture doesn't see update
// and so the velocity is miss-leading (i.e. not 0)
// We detect this by checking the time between the last gesture update.
const SUPPRESS_VELOCITY_TIME_MS = 150;
export function useBottomSheetDragGesture({
  id,
  disabled = false,
  clamped = false,
  frozenSharedValue
}) {
  const {
    currentPositionSharedValue,
    currentPositionLastVelocitySharedValue,
    wrapperHeightSharedValue,
    normalizedSnapPointsSharedValue
  } = useBottomSheetToolboxInternalContext();
  const {
    lock,
    release,
    setPosition,
    setVelocity,
    canLockSharedValue,
    hasLockSharedValue
  } = useBottomSheetPositionLock(`${LOCK_ID_NAMESPACE}:${id}`, BottomSheetPositionBuiltInLockPriority.GESTURE);
  const lastLockRef = React.useRef(id);
  React.useEffect(() => {
    if (id !== lastLockRef.current) throw new Error("Lock id can't be changed.");
  }, [id]);
  const startPositionSharedValue = useSharedValue(0);
  const lastUpdateTime = useSharedValue(0);
  const [enabled, setEnabled] = React.useState(false);
  useAnimatedReaction(() => canLockSharedValue.get() || hasLockSharedValue.get(), (lockable, lastLockable) => {
    if (lockable === lastLockable) return;
    runOnJS(setEnabled)(lockable);
  }, [canLockSharedValue, hasLockSharedValue.get]);
  const [windowHeight, setWindowHeight] = React.useState(Dimensions.get("window").height);
  React.useEffect(() => {
    const handle = Dimensions.addEventListener("change", ({
      window
    }) => {
      setWindowHeight(window.height);
    });
    return () => handle.remove();
  }, []);
  const frozenOriginOffsetYSharedValue = useSharedValue(0);
  return Gesture.Pan().onBegin(() => {
    if (!canLockSharedValue.get()) return;
    startPositionSharedValue.set(currentPositionSharedValue.get());
    frozenOriginOffsetYSharedValue.set(0);
  }).onUpdate(evt => {
    const normalizedSnapPoints = normalizedSnapPointsSharedValue.get();
    const wrapperHeight = wrapperHeightSharedValue.get();
    const lockable = canLockSharedValue.get() || hasLockSharedValue.get();
    if (!lockable || !normalizedSnapPoints || !wrapperHeight) return;

    // We want to lock onUpdate, rather than onBegin, so nested
    // touches do no unnecessarily lock the position.
    if (!hasLockSharedValue.get()) {
      lock();
    }
    if (frozenSharedValue?.get()) {
      frozenOriginOffsetYSharedValue.set(evt.translationY);
      return;
    }
    setVelocity(evt.velocityY);
    const rawPosition = startPositionSharedValue.get() - evt.translationY + frozenOriginOffsetYSharedValue.get();
    const maxSnapPoint = Math.max(...normalizedSnapPoints);
    const overshoot = Math.max(0, rawPosition - maxSnapPoint);
    if (clamped) {
      const clampedPosition = Math.max(Math.min(rawPosition, maxSnapPoint), 0);
      setPosition(clampedPosition);
    } else if (overshoot > 0) {
      const topInset = Math.max(1, windowHeight - wrapperHeight);
      const frictionRatio = friction(overshoot / topInset);
      const frictionPosition = maxSnapPoint + topInset * frictionRatio;
      const finalPosition = Math.min(frictionPosition, wrapperHeight + topInset);
      setPosition(finalPosition);
    } else {
      setPosition(rawPosition);
    }
    lastUpdateTime.set(Date.now());
  }).onFinalize(evt => {
    if (!hasLockSharedValue.get()) return;
    if (frozenSharedValue?.get()) {
      setVelocity(0);
    } else {
      const currentTime = Date.now();
      const velocity = -evt.velocityY;
      const timeSinceLastUpdate = currentTime - lastUpdateTime.get();
      currentPositionLastVelocitySharedValue.set(timeSinceLastUpdate > SUPPRESS_VELOCITY_TIME_MS ? 0 : velocity);
      setVelocity(velocity);
    }
    release();
  }).enabled(enabled && !disabled);
}
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