react-native-filament/lib/module/react/Animator.js

A real-time physically based 3D rendering engine for React Native

function _extends() { _extends = Object.assign ? Object.assign.bind() : function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
import React, { useEffect } from 'react';
import { RenderCallbackContext } from './RenderCallbackContext';
import { useAnimator } from '../hooks/useAnimator';
import { useSharedValue } from 'react-native-worklets-core';
import usePrevious from '../hooks/usePrevious';
import { ParentInstancesContext } from './ParentInstancesContext';
/**
 * Can be used to control the animation of a Model.
 * For pausing, playing, it is recommended to conditionally render the Animator component.
 *
 * @example
 * ```jsx
 * <Model source={DroneGlb}>
 *  <Animator animationIndex={2} />
 * </Model>
 * ```
 */
export function Animator(props) {
  const instances = React.useContext(ParentInstancesContext);
  if (instances == null) {
    throw new Error('Animator must be used inside a <Model> or <ModelInstance> component.');
  }
  const instance = instances[0];
  if (instance == null) {
    // Should never happen
    throw new Error('No instances found for the parent Model component. This is a bug.');
  }
  return /*#__PURE__*/React.createElement(AnimatorImpl, _extends({
    instance: instance
  }, props));
}
function AnimatorImpl({
  instance,
  animationIndex: animationIndexProp = 0,
  transitionDuration = 0,
  onAnimationsLoaded
}) {
  const animator = useAnimator(instance);

  // State for cross fading animations
  const prevAnimationIndex = useSharedValue(undefined);
  const prevAnimationStarted = useSharedValue(undefined);
  const animationInterpolation = useSharedValue(0);
  RenderCallbackContext.useRenderCallback(({
    passedSeconds
  }) => {
    'worklet';

    if (animator == null) {
      return;
    }
    const animationIndex = typeof animationIndexProp === 'number' ? animationIndexProp : animationIndexProp.value;
    animator.applyAnimation(animationIndex, passedSeconds);

    // Eventually apply a cross fade
    if (prevAnimationIndex.value != null && transitionDuration > 0) {
      if (prevAnimationStarted.value == null) {
        prevAnimationStarted.value = passedSeconds;
      }
      animationInterpolation.value += passedSeconds - prevAnimationStarted.value;
      const alpha = animationInterpolation.value / transitionDuration;

      // Blend animations using a cross fade
      animator.applyCrossFade(prevAnimationIndex.value, prevAnimationStarted.value, alpha);

      // Reset the prev animation once the transition is completed
      if (alpha >= 1) {
        prevAnimationIndex.value = undefined;
        prevAnimationStarted.value = undefined;
        animationInterpolation.value = 0;
      }
    }
    animator.updateBoneMatrices();
  }, [animator, animationIndexProp]);

  // Update prevAnimationIndex when animationIndexProp changes
  const previousAnimationIndexProp = usePrevious(animationIndexProp);
  useEffect(() => {
    // Update previous index if the prop is just a number:
    if (typeof animationIndexProp === 'number') {
      if (typeof previousAnimationIndexProp !== 'number') return;
      prevAnimationIndex.value = previousAnimationIndexProp;
      return;
    }

    // Update previous index if the prop is a shared value:
    let value = animationIndexProp.value;
    const removeListener = animationIndexProp.addListener(() => {
      prevAnimationIndex.value = value;
      value = animationIndexProp.value;
    });
    return () => {
      removeListener();
    };
  }, [animationIndexProp, prevAnimationIndex, previousAnimationIndexProp]);

  // Get all animations and return them using the onAnimationsLoaded callback
  useEffect(() => {
    if (animator == null || onAnimationsLoaded == null) {
      return;
    }
    const animations = [];
    for (let i = 0; i < animator.getAnimationCount(); i++) {
      animations.push({
        index: i,
        duration: animator.getAnimationDuration(i),
        name: animator.getAnimationName(i)
      });
    }
    onAnimationsLoaded(animations);
  }, [animator, onAnimationsLoaded]);
  return null;
}
//# sourceMappingURL=Animator.js.map