Function calcTransition

transitions.js:27–62

(defaults, transition, isLastClip)

}

export function calcTransition(defaults, transition, isLastClip) {
  if (transition === null || isLastClip) return { duration: 0 };

  const getTransitionDefault = (key) => (defaults.transition ? defaults.transition[key] : undefined);

  let transitionOrDefault = {
    name: (transition && transition.name) || getTransitionDefault('name'),
    duration: (transition && transition.duration != null) ? transition.duration : getTransitionDefault('duration'),
    params: (transition && transition.params) || getTransitionDefault('params'),
    easing: (transition && transition.easing !== undefined) ? transition.easing : getTransitionDefault('easing'),
    audioOutCurve: (transition && transition.audioOutCurve) || getTransitionDefault('audioOutCurve'),
    audioInCurve: (transition && transition.audioInCurve) || getTransitionDefault('audioInCurve'),
  };

  assert(!transitionOrDefault.duration || transitionOrDefault.name, 'Please specify transition name or set duration to 0');

  if (transitionOrDefault.name === 'random' && transitionOrDefault.duration) {
    transitionOrDefault = { ...transitionOrDefault, name: getRandomTransition() };
  }

  const aliasedTransition = {
    'directional-left': { name: 'directional', params: { direction: [1, 0] } },
    'directional-right': { name: 'directional', params: { direction: [-1, 0] } },
    'directional-down': { name: 'directional', params: { direction: [0, 1] } },
    'directional-up': { name: 'directional', params: { direction: [0, -1] } },
  }[transitionOrDefault.name];
  if (aliasedTransition) {
    transitionOrDefault = { ...transitionOrDefault, ...aliasedTransition };
  }

  return {
    ...transitionOrDefault,
    duration: transitionOrDefault.duration || 0,
    easingFunction: getTransitionEasingFunction(transitionOrDefault.easing, transitionOrDefault.name),
  };
}