// 引入bindingx，此库类似于微信小程序wxs，目的是让js运行在视图层，减少视图层和逻辑层的通信折损
const BindingX = uni.requireNativePlugin('bindingx')
export default {
	methods: {
		// 此处不写注释，请自行体会
		nvueScrollHandler(e) {
			if (this.indicator) {
				const anchor = this.$refs['uv-scroll-list__scroll-view'].ref
				const element = this.$refs['uv-scroll-list__indicator__line__bar'].ref
				const scrollLeft = e.contentOffset.x
				const contentSize = e.contentSize.width
				const { scrollWidth } = this
				const barAllMoveWidth = this.indicatorWidth - this.indicatorBarWidth
				// 在安卓和iOS上，需要除的倍数不一样，iOS需要除以2
				const actionNum = this.$uv.os() === 'ios' ? 2 : 1
				const expression = `(x / ${actionNum}) / ${contentSize - scrollWidth} * ${this.$uv.getPx(this.$uv.addUnit(barAllMoveWidth))}`
				BindingX.bind({
					anchor,
					eventType: 'scroll',
					props: [{
						element,
						property: 'transform.translateX',
						expression
					}]
				})
			}
		}
	}
}