press-swiper/libs/transition/transitionEmit.js

适配多端的高自定义轮播组件，多种3D效果。全面对标swiperjs。

export default function transitionEmit({
	swiper,
	runCallbacks,
	direction,
	step
}) {
	const {
		activeIndex,
		previousIndex
	} = swiper;
	let dir = direction;

	if (!dir) {
		if (activeIndex > previousIndex) dir = 'next';
		else if (activeIndex < previousIndex) dir = 'prev';
		else dir = 'reset';
	}

	swiper.emit(`transition${step}`);

	if (runCallbacks && activeIndex !== previousIndex) {
		if (dir === 'reset') {
			swiper.emit(`slideResetTransition${step}`);
			return;
		}

		swiper.emit(`slideChangeTransition${step}`);

		if (dir === 'next') {
			swiper.emit(`slideNextTransition${step}`);
		} else {
			swiper.emit(`slidePrevTransition${step}`);
		}
	}
}