react-native-screen-transitions/lib/module/utils/gesture/reset-gesture-values.js

Easy screen transitions for React Native and Expo

"use strict";

import { animate } from "../animation/animate";
import { velocity } from "./velocity";
export const resetGestureValues = ({
  spec,
  gestures,
  shouldDismiss,
  event,
  dimensions
}) => {
  "worklet";

  const vxNorm = velocity.normalize(event.velocityX, dimensions.width);
  const vyNorm = velocity.normalize(event.velocityY, dimensions.height);

  // Ensure spring starts moving toward zero using normalized gesture values for direction.
  const nx = gestures.normalizedX.value || event.translationX / Math.max(1, dimensions.width);
  const ny = gestures.normalizedY.value || event.translationY / Math.max(1, dimensions.height);
  const vxTowardZero = velocity.calculateRestoreVelocity(nx, vxNorm);
  const vyTowardZero = velocity.calculateRestoreVelocity(ny, vyNorm);
  let remainingAnimations = 4;
  const onFinish = finished => {
    "worklet";

    if (!finished) return;
    remainingAnimations -= 1;
    if (remainingAnimations === 0) {
      gestures.direction.value = null;
    }
  };
  gestures.x.value = animate(0, {
    ...spec,
    velocity: vxTowardZero
  }, onFinish);
  gestures.y.value = animate(0, {
    ...spec,
    velocity: vyTowardZero
  }, onFinish);
  gestures.normalizedX.value = animate(0, {
    ...spec,
    velocity: vxTowardZero
  }, onFinish);
  gestures.normalizedY.value = animate(0, {
    ...spec,
    velocity: vyTowardZero
  }, onFinish);
  gestures.isDragging.value = 0;
  gestures.isDismissing.value = Number(shouldDismiss);
};
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