react-native-reanimated/lib/module/layoutReanimation/defaultTransitions/JumpingTransition.js

More powerful alternative to Animated library for React Native.

'use strict';

import { withSequence, withTiming } from "../../animation/index.js";
import { Easing } from "../../Easing.js";
import { BaseAnimationBuilder } from "../animationBuilder/index.js";

/**
 * Layout jumps - quite literally - from one position to another. You can modify
 * the behavior by chaining methods like `.springify()` or `.duration(500)`.
 *
 * You pass it to the `layout` prop on [an Animated
 * component](https://docs.swmansion.com/react-native-reanimated/docs/fundamentals/glossary#animated-component).
 *
 * @see https://docs.swmansion.com/react-native-reanimated/docs/layout-animations/layout-transitions#jumping-transition
 */
export class JumpingTransition extends BaseAnimationBuilder {
  static presetName = 'JumpingTransition';
  static createInstance() {
    return new JumpingTransition();
  }
  build = () => {
    const delayFunction = this.getDelayFunction();
    const callback = this.callbackV;
    const delay = this.getDelay();
    const duration = this.durationV ?? 300;
    const halfDuration = duration / 2;
    const config = {
      duration
    };
    return values => {
      'worklet';

      const d = Math.max(Math.abs(values.targetOriginX - values.currentOriginX), Math.abs(values.targetOriginY - values.currentOriginY));
      return {
        initialValues: {
          originX: values.currentOriginX,
          originY: values.currentOriginY,
          width: values.currentWidth,
          height: values.currentHeight
        },
        animations: {
          originX: delayFunction(delay, withTiming(values.targetOriginX, config)),
          originY: delayFunction(delay, withSequence(withTiming(Math.min(values.targetOriginY, values.currentOriginY) - d, {
            duration: halfDuration,
            easing: Easing.out(Easing.exp)
          }), withTiming(values.targetOriginY, {
            ...config,
            duration: halfDuration,
            easing: Easing.bounce
          }))),
          width: delayFunction(delay, withTiming(values.targetWidth, config)),
          height: delayFunction(delay, withTiming(values.targetHeight, config))
        },
        callback
      };
    };
  };
}
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