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

More powerful alternative to Animated library for React Native.

'use strict';

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

/**
 * Fades out components from one position and shows them in another. You can
 * modify the behavior by chaining methods like `.duration(500)` or
 * `.delay(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#fading-transition
 */
export class FadingTransition extends BaseAnimationBuilder {
  static presetName = 'FadingTransition';
  static createInstance() {
    return new FadingTransition();
  }
  build = () => {
    const delayFunction = this.getDelayFunction();
    const callback = this.callbackV;
    const delay = this.getDelay();
    const halfDuration = (this.durationV ?? 500) / 2;
    return values => {
      'worklet';

      return {
        initialValues: {
          opacity: 1,
          originX: values.currentOriginX,
          originY: values.currentOriginY,
          width: values.currentWidth,
          height: values.currentHeight
        },
        animations: {
          opacity: delayFunction(delay, withSequence(withTiming(0, {
            duration: halfDuration
          }), withTiming(1, {
            duration: halfDuration
          }))),
          originX: withDelay(delay + halfDuration, withTiming(values.targetOriginX, {
            duration: 0
          })),
          originY: withDelay(delay + halfDuration, withTiming(values.targetOriginY, {
            duration: 0
          })),
          width: withDelay(delay + halfDuration, withTiming(values.targetWidth, {
            duration: 0
          })),
          height: withDelay(delay + halfDuration, withTiming(values.targetHeight, {
            duration: 0
          }))
        },
        callback
      };
    };
  };
}
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