react-native-reanimated/lib/module/reanimated2/layoutReanimation/animationsManager.js

More powerful alternative to Animated library for React Native.

import { withStyleAnimation } from '../animation/styleAnimation';
import { makeUIMutable } from '../mutables';
import { LayoutAnimationType } from './animationBuilder';
import { runOnUIImmediately } from '../threads';
const TAG_OFFSET = 1e9;
function startObservingProgress(tag, sharedValue, animationType) {
  'worklet';

  const isSharedTransition = animationType === LayoutAnimationType.SHARED_ELEMENT_TRANSITION;
  sharedValue.addListener(tag + TAG_OFFSET, () => {
    _notifyAboutProgress(tag, sharedValue.value, isSharedTransition);
  });
}
function stopObservingProgress(tag, sharedValue, removeView) {
  'worklet';

  sharedValue.removeListener(tag + TAG_OFFSET);
  _notifyAboutEnd(tag, removeView);
}
function createLayoutAnimationManager() {
  'worklet';

  const enteringAnimationForTag = new Map();
  const mutableValuesForTag = new Map();
  return {
    start(tag, type, yogaValues, config) {
      if (type === LayoutAnimationType.SHARED_ELEMENT_TRANSITION_PROGRESS) {
        global.ProgressTransitionRegister.onTransitionStart(tag, yogaValues);
        return;
      }
      const style = config(yogaValues);
      let currentAnimation = style.animations;
      if (type === LayoutAnimationType.ENTERING) {
        enteringAnimationForTag.set(tag, currentAnimation);
      } else if (type === LayoutAnimationType.LAYOUT) {
        // When layout animation is requested, but entering is still running, we merge
        // new layout animation targets into the ongoing animation
        const enteringAnimation = enteringAnimationForTag.get(tag);
        if (enteringAnimation) {
          currentAnimation = {
            ...enteringAnimation,
            ...style.animations
          };
        }
      }
      let value = mutableValuesForTag.get(tag);
      if (value === undefined) {
        value = makeUIMutable(style.initialValues);
        mutableValuesForTag.set(tag, value);
      } else {
        stopObservingProgress(tag, value, false);
        value._value = style.initialValues;
      }

      // @ts-ignore The line below started failing because I added types to the method – don't have time to fix it right now
      const animation = withStyleAnimation(currentAnimation);
      animation.callback = finished => {
        if (finished) {
          enteringAnimationForTag.delete(tag);
          mutableValuesForTag.delete(tag);
          const shouldRemoveView = type === LayoutAnimationType.EXITING;
          stopObservingProgress(tag, value, shouldRemoveView);
        }
        style.callback && style.callback(finished === undefined ? false : finished);
      };
      startObservingProgress(tag, value, type);
      value.value = animation;
    },
    stop(tag) {
      const value = mutableValuesForTag.get(tag);
      if (!value) {
        return;
      }
      stopObservingProgress(tag, value, true);
    }
  };
}
runOnUIImmediately(() => {
  'worklet';

  global.LayoutAnimationsManager = createLayoutAnimationManager();
})();
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